卫星激光测高仪在轨检校脉冲探测器的设计、测试及应用

针对我国高精度立体测绘卫星系统中激光测高仪的在轨场地检校的技术需求, 研制了激光脉冲探测器系统。 系统采用高速 PIN 探测单元及高速数据采集电路实现了 ns 级脉宽激光脉冲的定量化采集, 通过集成无线射频模块实 现脉冲探测器的数据远程传输。为保证脉冲探测器的野外应用性能, 系统进行了能量密度测试、能量响应一致性与 稳定性测试、探测器测量视场角测试等。试验结果表明脉冲探测器可以实现 1～120 nJ·cm?2 的能量范围采集, 能量响 应的一致性优于 5%, 稳定性优于 1.5%, 并且可以实现 ±12? 角度范围内的激光脉冲的有效采集。最终探测器成功应用 到我国“高分七号”卫星激光测高仪的在轨检校中, 获得了探测器阵列的有效激光触发数据, 为激光测高仪的在轨检校 试验提供了有效的数据支撑。

Design,Test and Application of Pulse Detector for On-Orbit Calibration of Satellite Laser Altimeter

To meet the technical requirement of on-orbit ground calibration of laser altimeter in the high precision stereo mapping satellite system in China, a laser pulse detector system is developed. The system adopts high-speed PIN detection unit and high-speed data acquisition circuit to realize quantitative acquisition of ns laser pulse, and realizes remote transmission of pulse detector data through radio frequency module. In order to ensure the field application performance of the pulse detector, the energy density test, energy response consistency and stability test, the field of view(FOV) measurement have been carried out for the system. The test results show that the energy acquisition in the range of 1–120 nJ·cm?2 can be accomplished by pulse detector, with the consistency of energy response better than 5% and the stability better than 1.5%, and ±12? FOV can be realized. Finally, the detector has been successfully applied to the on-orbit calibration of the GF-7 satellite laser altimeter, and the effective laser trigger data of the detector array has been obtained, which provides effective data support for the on-orbit calibration test of the laser altimeter.