レーダ、リモートセンシング、環境電磁工学

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Measurement engineering

01 Jan. 2018
電気通信大学大学院情報理工学研究科, 准教授

01 Jan. 2013
電気通信大学大学院情報理工学研究科, 助教

Apr. 2012 - Dec. 2012
ニューメキシコ工科大学, 博士研究員

01 Apr. 2010 - 31 Mar. 2012
日本学術振興会, 特別研究員

01 May 2021
電子情報通信学会和文論文誌B編集委員会 編集委員, 電子情報通信学会和文論文誌B編集委員会

Apr. 2016 - Mar. 2020
電子情報通信学会 宇宙・航行エレクトロニクス研究会 幹事, 電子情報通信学会 宇宙・航行エレクトロニクス研究会

2017
第32回電気通信普及財団テレコムシステム技術賞奨励賞

2016
2014 IEEE AES Japan Chapter Best Paper Award

2016
電気学会電気学術振興賞

2012
電気学会電気学術振興賞

Dec. 2010
American Geophysical Union
One presentation selected for an honorable mention
International society

Sep. 2010
One of the five finalist of Student Paper Competition
International society

Jun. 2010
電気学会基礎材料共通部門表彰
Japan society

Nov. 2009
電気関係学会関西支部連合大会奨励賞
Japan society

Sparse Frequency-Step Design in Stepped Multiple Frequency Pulse Radar
Takayuki INABA; Manabu AKITA; Takumi Taniguchi
電子情報通信学会論文誌 B, 105, 7, Jul. 2022, Peer-reviwed
Scientific journal, Japanese

Study on Comb-Shaped Frequency Assign and Signal Processing of Stepped Multiple Frequency Radar for Mitigating Multi-path Fading
Takayuki INABA; Manabu AKITA; Takumi Taniguchi
電子情報通信学会論文誌 B, 105, 4, 423-432, Apr. 2022, Peer-reviwed
Scientific journal, Japanese

Parameter Study and Evaluation of Stepped Multiple Frequency Radar for Centimeter-Class Object Detection in Background Clutter Environments
Takayuki INABA; Manabu AKITA
電気学会論文誌 D, 142, 1, 58-66, Jan. 2022, Peer-reviwed
Scientific journal, Japanese

Automatic Detection Method Using Recursive Frequency Estimation Method in Ultra-Wideband Multi-Frequency Step Radar
Kazuhiro Watanabe; Takayuki Inaba; Manabu Akita
電子情報通信学会論文誌 B, 104, 7, 687-701, Jul. 2021, Peer-reviwed
Scientific journal, Japanese

Coherently Combining Sparse-Multiband Processing Using Stepped Multiple Frequency Signals
Kazuhiro WATANABE; Takayuki INABA; Manabu AKITA
電子情報通信学会論文誌B, 104-B, 6, 563-574, Jun. 2021, Peer-reviwed
Scientific journal, Japanese

High Resolution Doppler Imaging for Stepped Multiple Frequency Rader
Kazuhiro WATANABE; Takayuki INABA; Manabu AKITA
電気学会論文誌C, 141, 3, 453-463, Mar. 2021, Peer-reviwed
Scientific journal, Japanese

周期相関符号を用いた多重化位相符号変調法における自己・相互相関特性の改善法
芝隆司; 秋田学; 稲葉敬之
信学論B, J102-B, 4, 2019, Peer-reviwed
Scientific journal, Japanese

ELD-STAPと多周波ステップCPC方式による車載前方監視レーダにおけるクラッタ抑圧
渡辺一宏; 秋田学; 稲葉敬之
信学論B, J101-B, 12, 2018, Peer-reviwed
Scientific journal, Japanese

ドップラー観測値を併用するTDOAにおける速度推定精度の改善
小菅義夫; 古賀禎; 宮崎裕己; 呂暁東; 秋田学; 稲葉敬之
信学論B, J101-B, 10, 857-866, 2018, Peer-reviwed
Scientific journal, Japanese

六次元運動モデルを使用したパルスドップラーレーダ用追尾フィルタの初期値
小菅義夫; 古賀禎; 宮崎 裕己; 秋田 学; 稲葉敬之
信学論B, J100-B, 1, 21-29, 2017, Peer-reviwed
Scientific journal, Japanese

ドップラーとバイアス誤差を有する距離とを観測値とする三次元の位置及び速度推定
小菅義夫; 古賀禎; 宮崎 裕己; 秋田 学; 稲葉敬之
信学論B, J100-B, 1, 280-290, 2017, Peer-reviwed
Scientific journal, Japanese

Experimental Comparison of Stepped Multiple Frequency CPC with Pulse Compression
Manabu Akita; Yuya Ota; Masato Watanabe; Takayuki Inaba
2017 IEEE MTT-S INTERNATIONAL CONFERENCE ON MICROWAVES FOR INTELLIGENT MOBILITY (ICMIM), IEEE, 115-118, 2017, Peer-reviwed, Authors have developed the stepped multiple frequency Complementary Phase Code (CPC) radar system. The unique radar modulation/demodulation method can achieve both a high range resolution and a long-range detection performance with a narrow band receiver compared with the transmission bandwidth. In this paper, the experimental verification to compare the detection range performances between Stepped multiple frequency CPC and Pulse compression was conducted. The experimental results indicated that the proposed modulation was 1.72 times superior to Pulse compression in the detection range performance on the condition where the transmission bandwidth, observation time, peak power, code length (the number of chips of switching codes), and the number of total pulses were set to be the same.
International conference proceedings, English

Nonlinear Effects for Sidelobe Characteristics of Pulse Radars
Takashi Shiba; Masato Watanabe; Masahiro Ishii; Manabu Akita; Takayuki Inaba
2017 IEEE MTT-S INTERNATIONAL CONFERENCE ON MICROWAVES FOR INTELLIGENT MOBILITY (ICMIM), IEEE, 41-44, 2017, Peer-reviwed, Nonlinear effects on correlation sidelobes of receiver signals for pulse radars, which were UWB pulse radar, pulse compression radar and mainly phase coded high pulse repetition frequency (PCHPRF) radar were discussed. Sidelobes of pulse radars increases in the case of nonlinear system with some other radio frequency (RF) parameters. We investigated on the parameters verified decision parameters for these sidelobe characteristics by using RF simulation method considering nonlinear effects.
International conference proceedings, English

Development of Millimeter Wave Radar Using Stepped Multiple Frequency Complementary Phase Code and Concept of MIMO Configuration
M. Akita; M. Watanabe; T. Inaba
Proceedings of IEEE 2017 Radar Conference, 5039, 2017, Peer-reviwed
International conference proceedings, English

多周波ＣW方式における速度・距離視野拡張法
秋田学; 渡辺俊人; 山下遼; 渡辺優人; 稲葉敬之
電気学会論文誌C, The Institute of Electrical Engineers of Japan, 136, 4, 532-541, 2016, Peer-reviwed, Multiple Frequency Continuous Wave (MFCW) is one of the efficient methods having both long range performance and range resolution. In this paper, the transmission sequences and signal processing to expand the observable maximum velocity and maximum range of MFCW are described. At first, we propose Hybrid Sequence MFCW in which frequency steps for the velocity estimation are added to the conventional MFCW to expand the observable maximum velocity. And then we also propose the signal processing using two initial frequencies to expand the observable maximum range. We show the initial experimental results on a general road. The results indicated that both proposed methods worked well on the field experiments.
Scientific journal, Japanese

ドップラー観測値を併用するTDOAの位置・速度推定
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
信学論B, J99-B, 3, 230-240, 2016, Peer-reviwed
Scientific journal, Japanese

テイラー級数推定法を用いたTSOAによる測位法の性能
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
信学論B, J99-B, 12, 966-975, 2016, Peer-reviwed
Scientific journal, Japanese

A Study on Maximal Ratio Combining in Stepped Multiple Frequency CPC Radars for Multipath Fading
M. Akita; M. Watanabe; T. Inaba
IEICE Technical Report, 116, 319, 115-120, 2016, Peer-reviwed
International conference proceedings, English

Angle Estimation Method using Blocking Matrix in Stepped Multiple Frequency Complementary Phase Code Modulation
M. Watanabe; M. Akita; T. Inaba
IEICE Technical Report, 116, 319, 121-126, 2016, Peer-reviwed
International conference proceedings, English

An Analysis of 3-dimensional Location and Velocity Estimation Using Range and Doppler Measurements
Y. Kosuge; T. Koga; H. Miyazaki; M. Akita; T. Inaba
IEICE Technical Report, 116, 319, 163-168, 2016, Peer-reviwed
International conference proceedings, English

等価時間サンプリング符号変調CW方式の提案
秋田学; 新田大輔; 渡辺優人; 稲葉 敬之
電子情報通信学会論文誌B, 98, 10, 1155-1168, Oct. 2015, Peer-reviwed
Scientific journal, Japanese

距離とドップラーを観測値とするテイラー級数推定法を用いた三次元の位置及び速度推定の解析
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
電子情報通信学会論文誌B, 98, 8, 830-839, Aug. 2015, Peer-reviwed
Scientific journal, Japanese

Estimations for Train Speed based on Two-Frequency CW and Initial Experiments on Railway Environments
M. Akita; T. Tamura; R. Yamashita,M; Watanabe,T. Inaba; H. Tsubota
IEICE Communications Express, The Institute of Electronics, Information and Communication Engineers, 4, 6, 192-197, Jun. 2015, Peer-reviwed, Estimation methods based on two-frequency continuous wave modulation (2FCW) for the train speed which are not affected by idling and slide of wheels are presented. The initial experimental results on the railway environments are also shown. The proposed methods obtained stable estimation results even in the situation where there exists shielding objects. The nonlinear least square method with an unknown quantity had the smallest standard deviation in the environment where the height of ballast track bed was not changed. The nonlinear least square method with two unknowns had the smallest bias errors between the estimation results and GPS speedometer.
Scientific journal, English

位置と速度を観測値とする位置のn階微分値を一定とする追尾フィルタの過度応答
小菅義夫; 古賀禎; 宮崎 裕己; 秋田学; 稲葉敬之
電子情報通信学会論文誌B, 98, 11, 433-441, 01 May 2015, Peer-reviwed
Scientific journal, Japanese

位置・速度を観測値とした過渡応答用の等加速度運動モデル非干渉形フィルタ
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
電子情報通信学会論文誌B, 98, 5, 433-441, May 2015, Peer-reviwed
Scientific journal, Japanese

多周波ステップCPCレーダの鉄道環境への応用のための基礎実験
渡辺優人; 秋田学; 稲葉敬之
電気学会論文誌Ｄ, 135, 5, 513-520, May 2015, Peer-reviwed
Scientific journal, Japanese

多周波ステップCPCレーダの提案と原理検証実験
渡辺優人; 秋田学; 稲葉敬之
電気学会論文誌Ｃ, Vol.135, No.3, 285-291, Mar. 2015, Peer-reviwed
Scientific journal, Japanese

A feasibility study on multiple frequency CW for landing radar
Manabu Akita; Daisuke Nakashima; Masato Watanabe; Takayuki Inaba
IEEJ Journal of Industry Applications, Institute of Electrical Engineers of Japan, 4, 2, 91-97, 2015, Peer-reviwed, Landing radar that measures the velocity and the altitude of the airframe has been developed for the sensor, which helps safe landing. In applications where the observation range is limited to a very short range such as the final stage of landing, we can expect to obtain a high signal-to-noise (S/N) ratio. In these situations, the multiple frequency continuous wave (CW) with MUSIC (MUltiple SIgnal Classification) algorithm is considered to be useful for achieving a high resolution with a low sampling rate of several tens of kilohertz and relatively low-speed signal processing. In this paper, the multiple frequency CW with 1D and 2D MUSIC algorithm to measure the altitude is described. The simulation shows that the bias errors in both methods are less than 1% of the altitudes. The random errors of 1D MUSIC and 2D MUSIC are 1.3%-1.7% and 0.8%-1.0%, respectively. The random errors of 2D MUSIC are smaller than those of 1D MUSIC. We also show the fundamental experimental results obtained in an athletic field using the radar fitted on a cage lifted by a crane. We could obtain stable estimation results on altitudes between 1.0m and 7.0 m. These results indicate that the multiple frequency CW radar is one of the effective tools for landing radar in the final phase of landing.
Scientific journal, English

Data processing procedure using distribution of slopes of phase differences for broadband VHF interferometer
Manabu Akita; Michael Stock; Zen Kawasaki; Paul Krehbiel; William Rison; Mark Stanley
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, AMER GEOPHYSICAL UNION, 119, 10, 6085-6104, May 2014, Peer-reviwed, The upgraded VHF digital interferometer (VHF DITF) system is introduced which can continuously sample the radiation associated with lightning. A new processing technique was implemented which uses the distribution of slopes of the phase difference versus frequency to locate the radiation source. By using this technique, frequency components which are not due to lightning can be excluded and low as well as high amplitude sources are located. As a result, both positive breakdown and negative breakdown are located, and negative recoil leaders (recoil leaders) are visualized in great detail. The recoil leaders which continue into the positive charge region are seen to slow their propagation and dim their radiation as they cross the flash initiation region. Analysis of the relative received power of the different breakdown types, negative leaders, recoil leaders, and positive leaders, also can be made. In both the intracloud and cloud-to-ground flash, the modes of the distributions of received power for negative leaders, recoil leaders, and positive leaders were approximately the same. The brightest emissions seen from the positive leader were substantially lower than the brightest emission seen from the negative leader. The results also indicate that positive leaders as well as lower elevation negative leader emit more low frequency radiation than recoil leaders and high-elevation negative leaders. By continuously sampling the VHF waveform, the upgraded VHF DITF locates many weak sources which the previous system was not capable of locating.
Scientific journal, English

Continuous broadband digital interferometry of lightning using a generalized cross-correlation algorithm
M. G. Stock; M. Akita; P. R. Krehbiel; W. Rison; H. E. Edens; Z. Kawasaki; M. A. Stanley
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, AMER GEOPHYSICAL UNION, 119, 6, 3134-3165, Mar. 2014, Peer-reviwed, The VHF Broadband Digital Interferometer developed by Osaka University has been improved to allow continuous sampling over the entire duration of a lightning flash and to utilize a generalized cross-correlation technique for determining the lightning source directions. Time series waveforms of 20-80 MHz signals received at three orthogonally located antennas are continuously digitized over multisecond intervals, as opposed to sequences of short-duration triggers. Because of the coherent nature of the measurements, radiation sources are located down into the ambient receiver and environmental noise levels, providing a quantum leap in the ability to study lightning discharge processes. When postprocessed using cross correlation, the measurements provide angular uncertainties less than 1 degrees and time resolution better than 1 mu s. Special techniques have been developed to distinguish between actual lightning sources and noise events, with the result being that on the order of 50,000-80,000 radiation sources are located for a typical lightning flash. In this study, two-dimensional interferometer observations of a classic bilevel intracloud flash are presented and combined with three-dimensional Lightning Mapping Array observations to produce a quasi 3-D map of lightning activity with the time resolution of the interferometer. As an example of the scientific utility of the observations, results are presented for the 3-D progression speed of negative leaders associated with intracloud K-leaders.
Scientific journal, English

UWBインパルスレーダにおけるパルス間周期符号変調による遠距離性の改善
渡辺優人; 秋田学; 稲葉敬之
電子情報通信学会論文誌B, J97-B, 7, 556-564, 2014, Peer-reviwed
Scientific journal, Japanese

2周波CWレーダを用いた歩行人物の特徴量抽出
秋田学; 深町弘毅; 渡辺優人; 稲葉敬之
電子情報通信学会論文誌B, J97-B, 8, 677-687, 2014, Peer-reviwed
Scientific journal, Japanese

Upward lightning observed by LF broadband interferometer
Yuji Takayanagi; Manabu Akita; Yoshitaka Nakamura; Satoru Yoshida; Takeshi Morimoto; Tomoo Ushio; Zen Ichiro Kawasaki; Daohong Wang; Nobuyuki Takagi; Hitoshi Sakurano; Yoshiyuki Kubouchi
IEEJ Transactions on Fundamentals and Materials, 133, 3, 132-141, 2013, Peer-reviwed, We have been designing and developing a 3-D lightning location system based on the broadband digital interferometry technique in LF bands. The LF broadband digital interferometer (LF DITF) consists of four or more LF receivers which detect electromagnetic (EM) waves in a wide frequency range from 400 Hz to 1 MHz associated with lightning discharges. Since each receiver detects EM waves in LF, the LF DITF is able to locate lightning discharges in several hundred kilometers. During the winter season in 2010-2011, a simultaneous observation of a LF DITF, a VHF DITF, and Rogowski coils was conducted in Hokuriku, Japan, which borders the Sea of Japan, for evaluation of the LF DITF for locating upward leaders and further understanding of winter lightning in Japan. We show the time series variation of the cases of a bipolar lightning flash and of an upward negative flash. © 2013 The Institute of Electrical Engineers of Japan.
International conference proceedings, English

One Site Three Dimensions Lightning Location System Using VHF Broadband Interferometers
S.Lotfy; M.Akita; A.Aiiam; Z.Kawasaki; M.Ragab
Journal of Atmospheric Electricity, Society of Atmospheric Electricity of Japan, 33, 2, 91-105, 2013, Peer-reviwed, Broadband radio interferometers have been developed to locate the sources of VHF/UHF radiation from lightning discharges in three spatial dimensions (3D) and time. The VHF broadband interferometer locates sources of radiation events at VHF band by extracting the differences of phases at various frequency components of Fourier spectra between a pair of antennas. Lightning images are derived by sensing the electromagnetic waves radiated from a lightning discharge process such as negative stepped leader. In this paper, a VHF broadband digital interferometer has been used to estimate the 3D lightning location from only one site. The site consists of three broadband antennas and a GPS receiver. As one of the observation results, a negative downward cloud-to-ground lightning flash will be presented and located using only one site.
Scientific journal, English

The initial stage processes of rocket-and-wire triggered lightning as observed by VHF interferometry
S. Yoshida; C. J. Biagi; V. A. Rakov; J. D. Hill; M. V. Stapleton; D. M. Jordan; M. A. Uman; T. Morimoto; T. Ushio; Z. -I. Kawasaki; M. Akita
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, AMER GEOPHYSICAL UNION, 117, D09119, doi:10.1029/2012JD01765, May 2012, Peer-reviwed, We examine VHF interferometric images, channel-base currents, and broadband electric field waveforms of the initial stage (IS) in two rocket-and-wire triggered lightning flashes. Two types of negative leaders, termed "long-duration" and "short-duration" leaders, were imaged by the VHF interferometers during the IS of the two flashes. There were three leaders that had relatively long durations of more than a few milliseconds. These three leaders were not accompanied by a significant change of channel-base current during their early stages of development, indicating that they corresponded to intracloud (IC) discharges that were not connected to the grounded triggered-lightning channel. Two of these three leaders eventually connected to the triggered-lightning channel and initiated initial continuous current (ICC) pulses. The third long-duration leader apparently developed from the vicinity of an isolated negative charge region toward an upper-level positive charge region and toward a branch of the grounded channel; it served to bridge the positive charge region and the triggered-lightning channel, resulting in the opposite polarity portion of the bipolar ICC. The short-duration negative leaders had durations of some hundreds of microseconds. These negative leaders apparently recoiled along the conductive channels created by branches of the upward positive leader (UPL); they initiated ICC pulses when the grounded channel was sufficiently conductive. It follows that ICC pulses can be initiated either by recoil leaders or via interception of separate in-cloud leaders by a grounded current-carrying channel.
Scientific journal, English

Propagation characteristics of lightning stepped leaders developing in charge regions and descending out of charge regions
Satoru Yoshida; Manabu Akita; Takeshi Morimoto; Tomoo Ushio; Zen Kawasaki
ATMOSPHERIC RESEARCH, ELSEVIER SCIENCE INC, 106, 86-92, Mar. 2012, Peer-reviwed, We conducted lightning observation campaign using VHF broadband digital interferometers (DITFs) in Darwin, Australia. We divided a stepped leader into two parts; the first part is a stepped leader propagating almost horizontally in the charge regions (ICR) of thunderclouds and the last part is a stepped leader descending out of the charge region (OCR). The VHF observation indicates that the channels of the stepped leaders OCR located by the DITFs were clearly broader than the channels of the stepped leaders ICR and dart leaders, indicating that the stepped leaders OCR descended in a heavily branched manner. High speed video camera images of a CG flash support the idea that stepped leaders OCR descend in a heavily branched manner. (C) 2011 Elsevier B.V. All rights reserved.
Scientific journal, English

Estimation for Charge Distributions related with Individual Lightning Discharges using VHF Broadband Digital Interferometer
M. Akita; Z. Kawasaki; S. Yoshida; T. Morimoto; T. Ushio
Journal of Atmospheric Electricity, Society of Atmospheric Electricity of Japan, 32, 2, 55-63, 2012, Peer-reviwed, We propose a new method of estimation for the amount of charge removed by individual lightning flashes in thunderclouds by means of three-dimensional (3D) VHF images and the associated electric field (E-field) change on the ground. In this method, we assume a reasonable assumption that the VHF sources located by the VHF broadband digital interferometers (VHF DITFs) correspond to charge transfer of each breakdown. We examine 3D VHF images recorded in Darwin, Australia and estimate the amount of charge removed by lightning discharges in thunderclouds. The average amount of charge removed in a CG and an IC flash is 28 C and 33 C, respectively. These results are in reasonable agreement with previous estimations for the amount of charge transferred using E-field measurements. The charge density removed by an IC flash was also estimated to be 4.3 × 10-10 C/m³ for the positive charge region and 5.8 × 10-9 C/m³ for the negative charge region, respectively. The estimation results indicate the charge structure before the flash occurred in thunderclouds.
Scientific journal, English

Effects of Charge Distribution in Thunderstorms on Lightning Propagation Paths in Darwin, Australia
Manabu Akita; Satoru Yoshida; Yoshitaka Nakamura; Takeshi Morimoto; Tomoo Ushio; Zen Kawasaki; Daohong Wang
JOURNAL OF THE ATMOSPHERIC SCIENCES, AMER METEOROLOGICAL SOC, 68, 4, 719-726, Apr. 2011, Peer-reviwed, The charge distributions in a thundercloud play an important role in the initiation and propagation of lightning discharges. To further understand the effects of charge distributions on lightning discharge, the authors conducted a very high-frequency (VHF) lightning observation campaign during the 2006/07 monsoon in Darwin, Australia, using a VHF broadband digital interferometer (DITF). A C-band polarimetric weather radar to estimate the precipitation profiles such as hydrometeor classification was operated by the Bureau of Meteorology (BOM) Research Centre. Cloud-to-ground (CG) and intracloud (IC) flashes were initiated from the outer and the inner parts of the upper side of the graupel regions, respectively. In the cases of CO flashes, the negative leaders travel first about 10 km horizontally through positive charge regions and then begin to bend toward the ground when they reach the edge of the positive charge regions where there is no graupel region underneath. In contrast, in the cases of the IC flashes the negatively charged graupel regions block the downward developments of negative leaders. It is noted that positive charge regions could facilitate the extension of the horizontal negative leader. These results may suggest that lightning flash types are closely dependent on their initiation locations and the surrounding charge distributions. The experimental results are consistent with other previous observation results and charge model simulations.
Scientific journal, English

VLF/LF 帯広帯域干渉計の開発と初期観測結果
高柳裕次; 秋田学; 中村佳敬; 吉田智; 森本健志; 牛尾知雄; 河崎善一郎; 山本賢司
電気学会論文誌A, 131, 9, 716-722, 2011, Peer-reviwed
Scientific journal, Japanese

雷放電に伴うVHF帯電磁波の統計的解析
住田裕紀; 吉田智; 中村佳敬; 秋田学; 森本健志; 牛尾知雄; 河崎善一郎
電気学会論文誌A, 131, 8, 659-664, 2011, Peer-reviwed
Scientific journal, Japanese

Lightning channels of cloud-to-ground flashes neutralizing multiple charge regions inside winter thunderclouds
Manabu Akita; Satoru Yoshida; Yoshitaka Nakamura; Takeshi Morimoto; Tomoo Ushio; Zen Ichiro Kawasaki; Daohong Wang
IEEJ Transactions on Fundamentals and Materials, 130, 5, 467-472, 2010, Peer-reviwed, Lightning Research Group of Osaka University (LRG-OU) has been developing and improving the VHF broadband digital interferometer (DITF) for thunderstorm observations. It enables us to locate the impulsive VHF radiation sources caused by lightning discharges with extremely high resolutions. As a result of the VHF observations during the 2007-2008 winter season in the Japan Sea coastal area, cloud-to-ground (CG) flashes that neutralize multiple charge regions inside thunderclouds are visualized by the VHF broadband DITF. The first flash is the positive CG flash that neutralizes multiple positive charge regions in a flash. The second flash is the bipolar lightning flash that neutralizes both positive and negative charge inside thunderclouds. In the case of bipolar lightning flashes, some tens millisecond after the return strokes, the subsequent negative breakdowns initiate from the proximities of the initiation points of the preceding negative stepped leaders. It was also found that the altitudes of negative charge regions are lower than 2km. The bipolar lightning flashes observed in this campaign neutralize positive charge after lowering the negative charge to the ground. © 2010 The Institute of Electrical Engineers of Japan.
Scientific journal, English

What occurs in K process of cloud flashes
M. Akita; Y. Nakamura; S. Yoshida; T. Morimoto; T. Ushio; Z. Kawasaki; D. Wang
Journal of Geophysical Research, 115, D07106, doi:10.1029/2009JD012016, 2010, Peer-reviwed
Scientific journal, English

VHF波帯広帯域干渉計で観測された夏季正極性落雷の特性
中村佳敬; 秋田学; 森本健志; 牛尾知雄; 河崎善一郎; 清水雅仁
電気学会論文誌A, 130, 4, 377-386, 2010, Peer-reviwed
Scientific journal, Japanese

High-resolution precipitation and lightning monitoring by the Ku-band broadband radar and the VHF broadband digital interferometer
Yoshitaka Nakamura; Eiichi Yoshikawa; Manabu Akita; Takeshi Morimoto; Tomoo Ushio; Zen Ichiro Kawasaki; Toshiya Saito; Takashi Nishida; Norio Sakazume
IEEJ Transactions on Fundamentals and Materials, 129, 12, 845-852, 2009, Peer-reviwed, We propose a high-resolution precipitation and lightning monitoring for meteorological application. This monitoring is mainly utilized the Ku-band broadband radar (BBR) and the VHF broadband digital interferometer (DITF). The BBR can accurately measure the radar reflectivity factor and the mean Doppler velocity with 5 m resolution over a range from 40 m to several kilometers for 10 W power using a pulse compression technique. The two or more DITFs make us visualize lightning channel propagations in three dimensions. Moreover, we add new functions that integrate these observation data and disclose integration analyses results with the quasi real-time information disclosure system. Initial observations for severe storms with lightning during summer and winter thunderstorm season by these monitoring instruments indicate that we obtain detailed precipitation distribution and detect active convective cells with lightning discharges. ©2009 The Institute of Electrical Engineers of Japan.
Scientific journal, Japanese

Evidence of negative leaders prior to fast rise ICC pulses of upward lightning
S. Yoshida; M. Akita; Y. Nakamura; T. Morimoto; T. Ushio; Z.-I. Kawasaki; D. Wang; N. Takagi
Journal of Atmospheric Electricity, Institute of Electrical Engineers of Japan (IEE Japan), 29, 1, 13-21, 2009, Peer-reviwed
Scientific journal, English

多周波ステップ方式に基づく非同期スパース周波数分割多重化法におけるレーダ間干渉に関する一考察
秋田学; 稲葉敬之; 谷口匠
Oral presentation, Japanese, 信学技報
2020

超広帯域多周波ステップ方式の合成帯域における距離ゲート内サイドローブに関するパラメータスタディ
谷口匠; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2020

79GHz帯における干渉波帯域を考慮したスパース周波数分割アダプティブレーダの基礎検討
谷口匠; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2019

超広帯域多周波ステップレーダにおける再帰的信号減産周波数推定法を用いた自動検知法
稲葉敬之; 渡辺一宏; 秋田学
Oral presentation, Japanese, 信学技報
2019

前方監視のための多周波ステップCPC-SIMOドップライメージング法の基礎検討
谷口匠; 稲葉敬之; 渡辺一宏; 秋田学
Oral presentation, Japanese, 信学技報
2019

圧縮センシングを用いた多周波ステップレーダにおけるスパース周波数選択法
稲葉敬之; 秋田学
Oral presentation, Japanese, 信学技報
2019

多周波ステップレーダの人工蜂コロニー法を用いた周波数多重化の基礎検討
稲葉敬之; 谷口匠; 秋田学
Oral presentation, Japanese, 信学技報
2019

多周波ステップCPCレーダによる小落下物検知
稲葉敬之; 秋田学; 芝隆司
Oral presentation, Japanese, 信学技報
2019

再帰的波形減算周波数推定法を前処理とした多周波ステップレーダにおける近接角度分離法
秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2019

距離和とドップラー和観測値を用いたテイラー級数推定法による目標の位置及び速度推定における初期値更新処理の評価
佐々木裕央; 角田智広; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

アレーアンテナを備える多周波ステップCPCレーダにおける 到来時間差およびレンジウォーク補償
秋田学; 渡辺一宏; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

スパース多周波ランダムステップCPCの複数点目標に対する距離アンビギュイティ抑圧効果の統計的評価
山田亮佑; 木村徳典; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会東京支部学生会研究発表会
2018

Relaxイテレーションを用いたBMMLアルゴリズムの提案と評価
山口和樹; 渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会東京支部学生会研究発表会
2018

多周波ステップCPCレーダにおける離隔周波数コヒーレント合成マルチパスフェージング対処アルゴリズムの検証
秋田学; 谷井健太郎; 稲葉敬之
Oral presentation, Japanese, 2018年電子情報通信学会総合大会
2018

多周波ステップCPCレーダを用いた車両位置，速度ベクトル推定法の実験的検証
秋田学; 山口達輝; 稲葉敬之
Oral presentation, Japanese, 2018年電子情報通信学会総合大会
2018

広帯域多周波ステップCPC方式における圧縮センシングを用いた速度視野改善法
太田裕也; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2018年電子情報通信学会総合大会
2018

圧縮センシングによるスパース多周波ランダムステップCPCの距離アンビギュイティ抑圧効果の統計的評価
山田亮佑; 木村徳典; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2018年電子情報通信学会総合大会
2018

狭受信機帯域での離隔周波数帯コヒーレント合成による高分解能化の目標分離特性
渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2018年電子情報通信学会総合大会
2018

Angle Estimation using Super Resolution and Blocking Matrix in Stepped Multiple Frequency Complementary Phase Code Radar Configuration
M. Akita; T. Inaba
Oral presentation, English, 2018 IEEE Radar Conference(RadarConf'18), International conference
2018

高精度の距離和とドップラー和観測値による交差点目標の追尾法 ～ シミュレーションによるケーススタディ ～
佐々木裕央; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

再帰的信号減算周波数推定法の基本特性の評価と多周波ステップCPC方式への適用の検討
山口和樹; 渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

離隔周波数帯受信信号を用いた広帯域コヒーレント合成による目標推定距離精度の評価
渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

圧縮センシングを用いた超広帯域多周波ステップCPC方式における 距離アンビギュイティ抑圧効果の定性的・定量的評価
山田亮佑; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2018

障害物回避時における多周波ステップCPC方式60GHzミリ波レーダの目標マッププロファイル
芝隆司; 安藤嘉章; 太田敏行; 坂本禎治郎; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

PCHPRF方式79GHzミリ波レーダ実験用試作機の開発
芝隆司; 渡辺優人; 石井雅博; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

多周波ステップCPCレーダによるELD-STAPのフィールド実験とクラッタ抑圧性能評価
渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

車載レーダ用追尾における複数フィルタの同時実行法～シミュレーションによる性能評価～
角田智広; 藤村嘉一; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

送信時刻と複数の受信時刻を使用した測位法
小菅義夫; 古賀 禎; 宮崎裕己; 呂 暁東; 秋田 学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

多周波ステップCPC方式におけるドップライメージングの任意時刻合焦と高速化の検討
渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

多周波ステップCPCレーダ及び機械学習アルゴリズムを用いた車両と歩行人物認識のための短時間特徴量
中村真帆; 渡辺一宏; 秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

２周波CWレーダを用いた歩行人物・小動物の特徴量抽出実験
秋田学; 中村真帆; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

多周波stepCPCレーダ及び機械学習アルゴリズムを用いた車両と歩行人物短時間特徴量と認識評価
中村真帆; 秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2017

ドップラ併用の場合のTOAとTDOAの測位
小菅義夫; 古賀禎; 宮崎裕己; 呂暁東; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

BM法を前処理とした離隔周波数帯コヒーレント合成処理による高距離分解能化
秋田学; 山口達輝; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

離隔周波数帯コヒーレント合成処理による高距離分解能化
渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

到来時間差のあるPC-HPRF方式における2次元Keystoneの検討
石井雅博; 芝隆司; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

多周波ステップCPC方式とパルス圧縮方式のS/N評価試験
太田裕也; 秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

マルチスタティックレーダにおける距離和単独とドップラー和併用方式の目標位置推定精度の比較
佐々木裕央; 藤村嘉一; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

多周波ステップCPCレーダを用いた歩行人物認識のための短時間特徴量の検討
中村真帆; 渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

多周波ステップCPCレーダーの車両反射信号の解析
香川正幸; 渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

多周波ステップCPCレーダによる各種環境でのクラッタ信号解析
木村徳典; 渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

送信漏れ込み信号を用いた受信信号キャリブレーション
渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会総合大会, Domestic conference
2017

超広帯域（79GHz帯域4GHz幅等）に向けた狭受信機帯域レーダ方式の提案
稲葉敬之; 秋田学; 渡辺優人
Oral presentation, Japanese, 信学技報
2017

多周波ステップCPC方式における目標自動検知法の検討
秋田学; 廣瀬太亮; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

広帯域多周波ステップCPCレーダの実験的検証と速度視野改善
太田裕也; 秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

BM法を用いた離隔周波数帯コヒーレント合成による高分解能測距手法の検討
山口達輝; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

狭受信機帯域幅での広帯域レーダ（多周波ステップCPC/ELD-SATP）による歩行者／車両判別技術の検討
渡辺一宏; 石崎健太; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

狭受信機帯域による超広帯域コヒーレントレーダ技術
稲葉敬之; 秋田学; 渡辺一宏
Invited oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

広帯域多周波ステップCPC方式レーダーにおける周波数ステップ ランダム化による速度視野拡大効果の統計的確認
芝隆司; 太田裕也; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

多周波ステップCPCミリ波レーダによる遠距離高分解能の実験的検証
秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

多周波近距離レーダの各種産業分野への応用開発
秋田学; 稲葉敬之
Invited oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

狭受信機帯域幅での広帯域レーダによる歩行者検出法の検討
渡辺一宏; 石崎健太; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

ドップラー及びバイアス誤差を有する距離観測値からの測位，測速
小菅義夫; 古賀禎; 宮崎裕己; 呂暁東; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2017年電子情報通信学会ソサイエティ大会, Domestic conference
2017

非周期相関低サイドローブ複素符号を用いたパルスMIMOレーダーへのフロントエンド特性の影響
芝隆司; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

Development of Millimeter Wave Radar Using Stepped Multiple Frequency Complementary Phase Code and Concept of MIMO Configuration
M. Akita; M. Watanabe; T. Inaba
Oral presentation, English, 2017 IEEE Radar Conference(RadarConf'17), International conference
2017

Experimental Comparison of Stepped Multiple Frequency CPC with Pulse Compression
M. Akita; Y. Ota; M. Watanabe; T. Inaba
Oral presentation, English, Proceedings of IEEE 2017 International Conference on Microwaves for Intelligent Mobility (ICMIM), International conference
2017

Nonlinear Effects for Sidelobe Characteristics of Pulse Radars
T.Shiba; M. Watanabe; M. Ishii; M. Akita; T. Inaba
Oral presentation, English, Proceedings of IEEE 2017 International Conference on Microwaves for Intelligent Mobility (ICMIM), International conference
2017

Coherently Combining Sparse-Multiband Processing for High Range Resolution by Narrow Band Radars
K. Watanabe; M. Akita; T. Inaba
Oral presentation, English, IEICE Technical Report, International conference
2017

多周波ステップCPCレーダーにおける距離と角度方向の2次元圧縮センシングの検討
木村徳典; 山田亮佑; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

多周波ランダムステップCPCレーダにおける電力差の大きい等レンジ目標分離のための信号降順減算による目標自動検出法
木村徳典; 山田亮佑; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

離隔周波数帯受信信号を用いた広帯域コヒーレント合成による高分解能測距方式の検討
渡辺一宏; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報
2017

完全相補符号を用いたMIMO多周波ステップCPCレーダの検討
秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2016年電子情報通信学会総合大会, Domestic conference
2016

マルチパスフェージング対処のための空間・周波数ダイバーシチ効果の検討
秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2016年電子情報通信学会総合大会, Domestic conference
2016

多周波ステップCPCレーダを用いた目標車両位置・速度ベクトル推定法の検討
渡辺優人; 秋田学; 中村真帆; 稲葉敬之
Oral presentation, Japanese, 2016年電子情報通信学会総合大会, Domestic conference
2016

2 周波CWレーダを用いた人物等認識における各種アルゴリズムの適用評価
中村真帆; 秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2016年電子情報通信学会総合大会, Domestic conference
2016

マルチパスフェージング対処のための多周波ステップCPC方式における最大比合成適用の一検討
秋田学; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2016

多周波ステップCPC方式におけるドップライメージングの高精度化の検討
渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2016

距離,角度,ドップラーを観測値とするレーダ用の等速直線運動モデルを使用した追尾フィルタの初期値
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2016

A Feasibility Study on Multiple Frequency CW for Landing Radar
M. Akita; D. Nakashima; M. Watanabe; T. Inaba
Invited oral presentation, English, 平成28年電気学会産業応用部門大会論文賞受賞記念講演, Invited, Domestic conference
2016

テイラー級数推定法を用いたTSOAとTDOA測位の関連
小菅義夫; 古賀 禎; 宮崎裕己; 秋田 学; 稲葉敬之
Oral presentation, Japanese, 信学会ソサイエティ大会, Domestic conference
2016

車載レーダ用追尾における複数フィルタの同時実行法
角田智広; 秋田学; 藤村嘉一; 小菅義夫
Oral presentation, Japanese, 信学会ソサイエティ大会, Domestic conference
2016

多周波ステップCPC方式とパルス圧縮方式の探知距離性能比較実験
秋田学; 太田裕也; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会／信学技報, Domestic conference
2016

次世代車載ミリ波レーダに向けた変復調方式・信号処理技術
稲葉敬之; 渡辺優人; 秋田学; 渡辺一宏
Invited oral presentation, Japanese, MWE2016, Domestic conference
2016

A Study on Maximal Ratio Combining in Stepped Multiple Frequency CPC Radars for Multipath Fading
M. Akita; M. Watanabe; T. Inaba
Oral presentation, English, International Conference on Space, Aeronautical and Navigational Electronics 2016 (ICSANE2016), International conference
2016

Angle Estimation Method using Blocking Matrix in Stepped Multiple Frequency Complementary Phase Code Modulation
M. Watanabe; M. Akita; T. Inaba
Oral presentation, English, International Conference on Space, Aeronautical and Navigational Electronics 2016 (ICSANE2016), International conference
2016

An Analysis of 3-dimensional Location and Velocity Estimation Using Range and Doppler Measurements
Y. Kosuge; T. Koga; H. Miyazaki; M. Akita; T. Inaba
Oral presentation, English, International Conference on Space, Aeronautical and Navigational Electronics 2016 (ICSANE2016), International conference
2016

2周波CW方式に基づく列車速度推定法と鉄道環境における基礎実験
秋田学; 山下遼; 稲葉敬之; 坪田光; 浅野晃
Oral presentation, Japanese, 信学技報, Domestic conference
2015

Ipatov完全周期符号の距離・ドップラ特性
渡辺優人; 山下遼; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会, Domestic conference
2015

多周波ステップCPCミリ波レーダにおける最尤推定法を用いた到来方向推定
山下遼; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会, Domestic conference
2015

2周波ICWを送信波としたバイスタティックレーダによる測位・測速
日原健人; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会, Domestic conference
2015

車載レーダ用目標追尾における半干渉形フィルタの基礎検討
瀬楽瑞樹; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会, Domestic conference
2015

多周波ステップCPCミリ波レーダを用いた横切り車両の横方向速度推定
早貸舜; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2015年電子情報通信学会総合大会, Domestic conference
2015

TOA測位とTDOA測位の関連
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会宇宙・航行エレクトロニクス（SANE）研究会, Domestic conference
2015

ドップラー観測の場合のTOA測位性能
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2015年信学会総合大会, Domestic conference
2015

超分解能法を用いた多周波ステップCPC方式における近接角度分離法
秋田学; 梅村昇平; 渡辺優人; 稲葉敬之
Oral presentation, Japanese, 2015年電子情報通信学会通信ソサイエティ大会, Domestic conference
2015

PC-HPRF方式多重化のための非周期相関低サイドローブ複素符号
芝隆司; 渡辺優人; 石井雅博; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

PC-HPRF方式レーダー用RFシミュレーションの開発
芝隆司; 渡辺優人; 石井雅博; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

次世代高度運転支援システムのためのレーダー技術の研究開発（招待講演）
稲葉敬之; 渡辺優人; 渡辺一宏; 秋田学
Oral presentation, Japanese, 2015年電子情報通信学会通信ソサイエティ大会, Domestic conference
2015

ドップラー観測の場合のTDOA測位性能
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
Oral presentation, Japanese, 2015年電子情報通信学会通信ソサイエティ大会, Domestic conference
2015

多周波ステップCPCレーダーに対する周波数ステップ対応ドップラ補正適用によるELD-STAP性能への影響の評価
横川貴洋; 高橋陸; 渡辺一宏; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

各種環境での多周波ステップCPCレーダーを用いた計測実験とELD-STAPの特性評価
渡辺一宏; 横川貴洋; 高橋陸; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

距離とドップラーを観測値とする位置及び速度推定
小菅義夫; 古賀禎; 宮崎裕己; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

PC-HPRF方式レーダーのアンテナ信号に対する完全周期符号を用いた符号多重化方式
芝隆司; 渡辺優人; 石井雅博; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

多周波不等間隔ステップCPC方式の距離サイドローブ特性
渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

2周波CWレーダーを用いた壁越し歩行人物身長推定実験
安藤嘉章; 瀬楽瑞樹; 渡辺優人; 秋田学; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

複数反射点を有する目標に対する車載レーダー追尾のフィールドデータ解析
瀬楽瑞樹; 秋田学; 小菅義夫; 稲葉敬之
Oral presentation, Japanese, 信学技報, Domestic conference
2015

マルチスタティックレーダにおける送信シーケンスおよび信号処理法に関する一検討
山下遼; 秋田学; 稲葉敬之
Oral presentation, Japanese, 電子情報通信学会SANE研究会/信学技報, Domestic conference
Jan. 2014

Fundamental Experiments on Super Resolution Range/Angle Estimation by Millimeter Wave Radar using Stepped Multiple Frequency Complementary Phase Code Modulation
M. Akita; R. Yamashita; M. Watanabe; T. Inaba
Oral presentation, English, International Conference on Space, Aeronautical and Navigational Electronics 2014 (IC-SANE2014), International conference
2014

Estimation of Charge Distribution of Individual Lightning Discharges by VHF Broadband Interferometer
Z. Kawasaki; M. Akita
Oral presentation, English, 32nd International Conference on Lightning Protection (ICLP2014), International conference
2014

Measure of Estimated Accuracy Using Singular Values for TOA Location System
Y. Kosuge; T. Koga; H. Miyasaki; M. Akita; T. Inaba
Oral presentation, English, International Conference on Space, Aeronautical and Navigational Electronics 2014 (IC-SANE2014), International conference
2014

Millimeter Wave Radar using Stepped Multiple Frequency Complementary Phase Code Modulation
Masato Watanabe; Manabu Akita; Takayuki Inaba
Oral presentation, English, ITS WORLD CONGRESS TOKYO 2013, International conference
Oct. 2013

Long Range Detection of UWB Radar using Interpulse Cyclic Phase Code
Masato Watanabe; Manabu Akita; Takayuki Inaba
Oral presentation, English, 2013 Asia-Pacific Conference on Synthetic Aperture Radar (APSAR2013), International conference
Sep. 2013

近距離物体の距離・角度の電波センシング法に関する一検討
新田大輔; 秋田学; 稲葉 敬之
Oral presentation, Japanese, 2013 年電子情報通信学会通信ソサイエティ大会, Domestic conference
Sep. 2013

車載レーダを想定したマルチスタティック配置に関する一検討
山下遼; 新田大輔; 秋田学; 稲葉 敬之
Oral presentation, Japanese, 2013年電子情報通信学会通信ソサイエティ大会, Domestic conference
Sep. 2013

Observations of Lightning using a Continuous Broadband Interferometer and Cross Correlation
M. Stock; M. Akita; H. E. Edens; P. Krehbiel; W. Rison; Z. I. Kawasaki
Oral presentation, English, 93rd American Meteorological Society Annual Meeting, International conference
Jan. 2013

A Study on Characteristics of Lightning Processes Using Upgraded Continuous VHF Broadband Interferometer
M. Akita; M. Stock; H. Edens; P. Krehbiel; W. Rison; Z. Kawasaki
Oral presentation, English, 93rd American Meteorological Society Annual Meeting, International conference
Jan. 2013

Analysis of Electric Field Change, Interferometric, and Lightning Mapping Data to Study Intra-Cloud Lightning
J. Lapierre; M. Stock; M. Akita; R. Sonnenfeld; P.Krehbiel; W. Rison; Z. Kawasaki; H. Edens
Oral presentation, English, AGU FALL MEETING 2012, International conference
Dec. 2012

Observation of Lightning Processes Using Upgraded Continuous VHF Broadband Interferometer
M. Akita; M. Stock; J. Trueblood; H. E Edens; P. Krehbiel; W. Rison; Z. Kawasaki
Oral presentation, English, AGU FALL MEETING 2012, International conference
Dec. 2012

Combined VHF Broadband Interferometer and Lightning Mapping Array Observations of Lightning Discharge Processes
M. Akita; M. Stock; H. Edens; P. Krehbiel; S. Hunyady; T. Morimoto; S. Yoshida; T. Ushio; Z. Kawasaki
Oral presentation, English, AGU FALL MEETING 2011, International conference
Dec. 2011

A vhf broadband interferometer for lightning observation
T. Ushio; Z. Kawasaki; M. Akita; S. Yoshida; T. Morimoto; Y. Nakamura
Invited oral presentation, English, The XXXth URSI General Assembly
Aug. 2011

Stepped leader characteristics in developing horizontally within thunderclouds and in descending out of thunderclouds
S. Yoshida; M. Akita; T. Morimoto; T. Ushio; Z.-I. Kawasaki
Invited oral presentation, English, The XXXth URSI General Assembly, International conference
Aug. 2011

M. Akita, Y. Takayanagi, Y. Nakamura, S. Yoshida, T. Morimoto, T. Ushio, Z. Kawasaki
M. Akita; Y. Takayanagi; Y. Nakamura; S. Yoshida; T. Morimoto; T. Ushio; Z. Kawasaki
Oral presentation, English, l4th International Conference on Atmospheric Electricity (ICAE), International conference
Aug. 2011

Development and initial observations of VLF/LF broadband digital interferometer
Y. Takayanagi; M. Akita; Y. Nakamura; S. Yoshida; T. Morimoto; T. Ushio; Z.-I. Kawasaki
Oral presentation, English, 14th International Conference on Atmospheric Electricity (ICAE 2011), International conference
Aug. 2011

A Study on the Effects of the Charge Distributions on Lightning Leader Progressions Using the VHF Broadband Digital Interferometer
M. Akita; S. Yoshida; T. Morimoto; T. Ushio; Z. Kawasaki
Oral presentation, English, ICSANE2010/IEICE Tech. Rep., vol. 110, no. 250, International conference
Nov. 2010

The Relationship Between the Leader Progressions and the Charge Distributions
M. Akita; T. Morimoto; T. Ushio; Z. Kawasaki; D. Wang
Invited oral presentation, English, 2010 Asia-Pacific Radio Science Conference (AP-RASC'10), International conference
Sep. 2010

Observations of Bipolar Lightning Flashes Using the VHF Broadband Digital Interferometer
M. Akita; S. Yoshida; T. Morimoto; T. Ushio; Z. Kawasaki
Oral presentation, English, 2009 International Symposium on Electromagnetic Compatibility (EMC’09 Kyoto), International conference
Jul. 2009

Comprehensive study on K-events by means of VHF broadband interferometer observations
M. Akita; T. Morimoto; T. Ushio; Z. Kawasaki
Oral presentation, English, 29th International Conference on Lightning Protection (ICLP), International conference
Jun. 2008

組み込みシステム
The University of Electro-Communications

機械知能システム学専攻基礎
電気通信大学

専門実験
The University of Electro-Communications

電気電子計測
The University of Electro-Communications

電気電子計測
電気通信大学

組み込みシステム
電気通信大学

機械知能システム学専攻基礎
The University of Electro-Communications

電磁気学および演習
The University of Electro-Communications

電磁気学および演習
電気通信大学

専門実験
電気通信大学

基礎科学実験A
The University of Electro-Communications

基礎科学実験A
電気通信大学

基礎プログラミングおよび演習
The University of Electro-Communications

基礎プログラミングおよび演習
電気通信大学

スパース周波数分割レーダの研究開発
Apr. 2019

超広帯域コヒーレントレーダ技術の研究開発
稲葉敬之
Apr. 2017 - Mar. 2019

多周波ステップCPC方式における空間・周波数ダイバーシチ技術の研究
01 Apr. 2018

狭帯域・遠近両用高分解能小型レーダー技術の研究開発
稲葉敬之
Apr. 2016 - Mar. 2017

狭帯域・遠近両用高分解能小型レーダー技術の研究開発
稲葉敬之
Apr. 2015 - Mar. 2016

狭帯域・遠近両用高分解能小型レーダー技術の研究開発
稲葉敬之
Oct. 2014 - Mar. 2015

マルチスタティック方式による次世代車載レーダの基盤技術研究
01 Apr. 2014

バイスタティック方式による次世代車載レーダの基盤技術研究
30 Aug. 2013 - 31 Mar. 2014

目標推定方法およびプログラム
Patent right, 稲葉敬之, 渡辺一宏, 秋田学, 特願2019-018500, Date applied: 2019

離隔周波数合成レーダ装置、距離推定方法及びプログラム
Patent right, 稲葉 敬之, 秋田 学, 渡辺 優人, 特願2018-022503, Date applied: 2018

列車状態検出装置及び列車状態検出方法
Patent right, 特願2015-085817, Date applied: 2015, 特許第6219335号, Date issued: 06 Oct. 2017

列車位置検出装置及び列車位置検出方法
Patent right, 特願2014-040376, Date applied: 2015, 特許第6145417号, Date issued: 19 May 2017

離隔周波数合成レーダ装置、距離推定方法及びプログラム
Patent right, 稲葉敬之, 秋田学, 渡辺優人, 特願2017-024199, Date applied: 2017

列車速度検出装置及び列車速度検出方法
Patent right, 浅野晃, 坪田光, 稲葉敬之, 秋田学, 特願2014-040375, Date applied: 2014

列車位置検出装置及び列車位置検出方法
Patent right, 浅野晃, 坪田光, 稲葉敬之, 秋田学, 特願2014-040376, Date applied: 2014