2 0 0 0 OA スピンを伴う飛翔体に搭載可能なGPS受信機の開発
- 著者
- 海老沼 拓史 楠 知通 阿部 俊雄 齋藤 宏文
- 出版者
- 一般社団法人 日本航空宇宙学会
- 雑誌
- 宇宙技術 (ISSN:13473832)
- 巻号頁・発行日
- vol.8, pp.15-21, 2009 (Released:2009-08-05)
- 参考文献数
- 8
This paper describes the design and development of a dedicated GPS receiver for spin stabilized launch vehicles. The receiver is built around a commercially available low cost GPS chip set and operates an enhanced firmware specifically adapted for high dynamics applications. In order to keep tracking a sufficient number of GPS signals even during the spinning motion, we use multiple GPS patch antennas and space them equally apart each other around the cylindrical launcher body. A new signal combining scheme was developed to avoid deep fading in antenna gain pattern. This technique requires phase control to keep signals received on multiple antennas in phase with each other. A dualantenna GPS receiver was developed to evaluate the proposed signal combining algorithm. The result showed that the proposed algorithm was capable of providing stable and continuous signal tracking under a high-rate spinning motion while simple RF combining through a power combiner was failed.
1 0 0 0 OA 超小型地球観測衛星PRISMにおける軌道推定予備実験
- 著者
- 海老沼 拓史 千蔵 真也 中須賀 真一
- 出版者
- 一般社団法人 日本航空宇宙学会
- 雑誌
- 宇宙技術 (ISSN:13473832)
- 巻号頁・発行日
- vol.6, pp.1-8, 2007 (Released:2007-03-31)
- 参考文献数
- 11
- 被引用文献数
- 1 1
An experimental Global Positioning System (GPS) receiver based on a Commercial Off-the-Shelf (COTS) hardware and open source signal processing software modified for space applications is planed to be integrated into the PRISM Earth observation nano-satellite. This paper describes the preliminary orbit determination experiments considered to be performed as part of the PRISM missions to study the operation and performance of the COTS-based GPS receiver on a very small and low-power satellite flying in a low Earth orbit.
1 0 0 0 OA ソフトウェアGPS/Galileo受信機の製作と評価
- 著者
- 海老沼 拓史 近藤 俊一郎 岩 張 安田 明生
- 出版者
- 公益社団法人 日本航海学会
- 雑誌
- 日本航海学会論文集 (ISSN:03887405)
- 巻号頁・発行日
- vol.118, pp.213-220, 2008-03-25 (Released:2017-01-15)
- 参考文献数
- 16
- 被引用文献数
- 1 1
Galileo is the European Global Navigation Satellite System (GNSS) designed to be interoperable with the United States' Global Positioning System (GPS). Galileo and GPS interoperability means that hybrid GPS/Galileo receivers will offer improved performance in several ways compared to GPS- or Galileo-only receivers. This paper presents the design and implementation of a software GPS/Galileo receiver, together with testing results using a real Galileo signal from GIOVE-A, the first Galileo in-orbit validation satellite. Furthermore, a new navigation solution algorithm to estimate the GPS-Galileo system time difference is proposed. Hybrid navigation results show that 2 m (2drms) positioning accuracy can be achievable without knowing the exact system time difference.
1 0 0 0 OA オープンソースGPSを用いた小型宇宙機用GPS受信機の開発
- 著者
- 海老沼 拓史 中須賀 真一
- 出版者
- 一般社団法人 日本航空宇宙学会
- 雑誌
- 日本航空宇宙学会論文集 (ISSN:13446460)
- 巻号頁・発行日
- vol.54, no.635, pp.542-548, 2006 (Released:2006-12-25)
- 参考文献数
- 9
- 被引用文献数
- 2 2
An increasing number of small satellites and hybrid rockets are proposed for miscellaneous space applications, many of which assume the use of Global Positioning System (GPS) for positioning. Some of those platforms are designed and developed by university students and require very low power consumption and also low cost. This paper describes the adaptation of small GPS receivers and open source receiver firmware for space and high dynamics applications, including software performance validation using a GPS signal simulator.
1 0 0 0 オープンソースGPSを用いた小型宇宙機用GPS受信機の開発
- 著者
- 海老沼 拓史 中須賀 真一
- 出版者
- 一般社団法人 日本航空宇宙学会
- 雑誌
- 日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences (ISSN:13446460)
- 巻号頁・発行日
- vol.54, no.635, pp.542-548, 2006-12-05
- 被引用文献数
- 9 2 2
An increasing number of small satellites and hybrid rockets are proposed for miscellaneous space applications, many of which assume the use of Global Positioning System (GPS) for positioning. Some of those platforms are designed and developed by university students and require very low power consumption and also low cost. This paper describes the adaptation of small GPS receivers and open source receiver firmware for space and high dynamics applications, including software performance validation using a GPS signal simulator.
1 0 0 0 OA 海面で反射した測位衛星電波による海面高度計測と津波監視への応用
- 著者
- 近藤 俊一郎 海老沼 拓史 久保 信明 安田 明生
- 出版者
- 一般社団法人電子情報通信学会
- 雑誌
- 電子情報通信学会技術研究報告. SANE, 宇宙・航行エレクトロニクス (ISSN:09135685)
- 巻号頁・発行日
- vol.107, no.169, pp.25-30, 2007-07-20
電離層シンチレーションは電離層のF層(≧地上高150km)の局地的な電子密度の不規則性によって起こるとされている.この不規則な領域と送信機および受信機の相対的な運動により,GPS信号の信号強度と位相が急激に変化し,受信機のロックはずれやサイクルスリップを起こすことが知られている.本研究では,既存の研究で提案されているモデルを基にシンチレーションサンプルの生成ソフトウェアを製作し,日本で観測される標準的な強度のシンチレーションに対する位相ロックループ(PLL)の性能をシミュレーションで評価した.シミュレーションの結果,帯域可変型Fast Adaptive Bandwidth (FAB) PLLはシンチレーションの影響下にいても位相誤差を見積もって帯域幅を制御できることが確認できたが,信号強度の低い信号では利用は困難であることも明らかになった.