Study an Observation Method of Space Debris Environments by a Laser Radar

激光雷达空间碎片环境观测方法研究

• 批准号: 12555274
• 负责人: TAKANO Tadashi
• 金额: $ 6.53万
• 依托单位: Institute of Space & Astronautical Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555274/
• 关键词: Space debris; Observation; Laser radar; Spatial combining of illumination lights; Speckle; High power semiconductor laser; Radiation pattern with a single lobe; Light wave antenna with shaped components; デブリ; アレイ化

The detection capability of laser radars strongly depends on the output of a laser and the performance of an optical antenna. The radiation pattern of the laser should be uniform without dark spots as much as possible. It was experimentally shown that the characteristics of the laser radar is significantly degraded due to the deterioration of the patterns, if a conventional high power laser of W-class is applied to wireless uses. The design method was derived to smooth the radiation pattern of a broad area laser which is most promising for these applications.It is contrived to shape a sub-reflector and a lens in the feed system of a high-performance optical antenna as the reflector shaping method which is most tolerant to manufacturing errors. The validity was shown through simulation.Strong illuminating and receiving lights are obtained by spatially superimposing the output powers from plural lasers. And it is possible to restrict the speckle effect which is significant in a single mode laser. This fact was confirmed experimentally.

激光雷达的探测能力在很大程度上取决于激光器的输出功率和光学天线的性能。激光器的辐射图案应尽可能均匀，无暗斑。实验表明，如果将传统的W级高功率激光器应用于无线用途，则由于图案的劣化，激光雷达的特性显著劣化。为了使大面积激光器的辐射方向图平滑化，提出了一种设计方法，并设计了高性能光学天线馈电系统中的副反射镜和透镜的成形方法，作为最能容忍制造误差的反射镜成形方法。仿真结果表明了该方法的有效性，通过多路激光器输出功率的空间叠加，获得了较强的照明光和接收光。并且可以限制在单模激光器中显著的散斑效应。这一事实得到了实验的证实。

项目成果

森本直之, 戸田知朗, 高野忠: "ブロードエリアレーザの放射特性解析及び特性改善法の提案"2001年電子情報通信学会論文誌. Vol.J84-C, No.1. 17-24 (2001)

Naoyuki Morimoto、Tomoaki Toda、Tadashi Takano：“广域激光器的辐射特性分析和特性改进方法的提案”2001 年电子信息通信工程师学会学报，第 J84-C 卷，第 17-24 期。 (2001)

T.Takano: "Leonids Measurement 2001 in Japan"20th IADC, Guildford, UK. (2002)

T.Takano：“2001 年日本狮子座流星雨测量”第 20 届 IADC，英国吉尔福德。

M.Tanaka, Y. Moritaka, Y.Akahoshi, R.Nakamura, A.Yamori and S.Sasaki: "Development of a Lightweight Space Debris Shield Using High Strength Fibers"International Journal of Impact Engineering. Vol.26. 761-772 (2001)

M.Tanaka、Y. Moritaka、Y.Akahoshi、R.Nakamura、A.Yamori 和 S.Sasaki：“使用高强度纤维开发轻质空间碎片防护罩”国际冲击工程学报。

T. Takano and Y. Ikegai: "Antennas in the Optical Frequency Range"AP2000 (SP-444) Davos. (2000)

T. Takano 和 Y. Ikegai：“光频率范围内的天线”AP2000 (SP-444) 达沃斯。

N. Morimoto, T. Toda and T. Takano: "Study of Application Fields of Lightwave Comuinications in Space"22nd International Symposium on Space Technology and Science. ISTS 2000-i-15p. (2000)

N. Morimoto、T. Toda 和 T. Takano：“空间光波通信应用领域的研究”第 22 届国际空间技术与科学研讨会。