| 距离门宽度对单光子激光测高卫星探测概率及测距精度的影响 |
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| 引用本文： | 李国元,黄佳鹏,唐新明,黄庚华,周世宏,赵严铭.距离门宽度对单光子激光测高卫星探测概率及测距精度的影响[J].测绘学报,2018,47(11):1487-1494. |
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| 作者姓名： | 李国元 黄佳鹏 唐新明 黄庚华 周世宏 赵严铭 |
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| 作者单位： | 1. 国家测绘地理信息局卫星测绘应用中心, 北京 100048;2. 中国科学院空间主动光电技术重点实验室, 上海 200083;3. 江苏省地理信息资源开发与利用协同创新中心, 江苏 南京 210023;4. 上海卫星工程研究所, 上海 201109 |
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| 基金项目： | 中国科学院空间主动光电技术重点实验室开放课题（2018-ZDKF-1）；国家高分辨率对地观测青年创新基金（GFZX04061502）；上海卫星工程研究所科技创新基金（BH1602）；国家自然科学基金（41871382） |
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| 摘 要： | 针对距离门对单光子激光测高卫星探测概率以及测距精度的影响，结合激光雷达方程、单光子探测方程进行理论推导，采用不同宽度的距离门分析讨论，并利用蒙特卡洛方法进行模拟仿真试验。通过理论分析和仿真试验证明，距离门宽度对于探测概率影响不大，对于虚警概率具有较大影响，距离门为100 ns时，测距误差可以满足激光测高卫星的测距要求，当距离门宽度超过400 ns时，噪声占比会较大，测距精度会急剧下降，需要在数据后处理阶段采用精细化的滤波算法提取有效探测光子，保证测量精度。为保证对同一点重复观测25次，根据ICESat-2卫星的激光载荷参数，推导出光斑大小、光斑间距、激光重频三者之间的定量化关系。相关结论对于后续国产单光子激光测高卫星的设计与指标论证可提供一定参考。
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| 关 键 词： | 卫星激光测高 距离门 测距精度 探测概率 蒙特卡洛 单光子激光 |
| 收稿时间： | 2017-08-18 |
| 修稿时间： | 2018-01-27 |
Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite |
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| LI Guoyuan,HUANG Jiapeng,TANG Xinming,HUANG Genghua,ZHOU Shihong,ZHAO Yanming.Influence of Range Gate Width on Detection Probability and Ranging Accuracy of Single Photon Laser Altimetry Satellite[J].Acta Geodaetica et Cartographica Sinica,2018,47(11):1487-1494. |
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| Authors: | LI Guoyuan HUANG Jiapeng TANG Xinming HUANG Genghua ZHOU Shihong ZHAO Yanming |
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| Institution: | 1. Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China;2. Key Laboratory of Space Active Opto-electronics Technology, Chinese Academy of Sciences, Shanghai 200083, China;3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;4. Shanghai Institute of Satellite Engineering, Shanghai 201109, China |
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| Abstract: | The influence of the single photon laser altimeter range-gate width on the detection probability and ranging accuracy is discussed and analyzed, according to the LiDAR equation, single photon detection equation and the Monte Carlo method to simulate the experiment. The simulated results show that the probability of detection is not affected by the range gate, while the probability of false alarm is relative to the gate width. When the gate width is 100 ns, the ranging accuracy can accord with the requirements of satellite laser altimeter. But when the range gate width exceeds 400 ns, ranging accuracy will decline sharply. The noise ratio will be more as long as the range gate to get larger, so the refined filtering algorithm during the data processing is important to extract the useful photons effectively. In order to ensure repeated observation of the same point for 25 times, according to the parameters of ICESat-2, we deduce the quantitative relation between the footprint size, footprint, and the frequency repetition. The related conclusions can provide some reference for the design and the development of the domestic single photon laser altimetry satellite. |
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