星载激光雷达高精高稳探测卫星系统保证技术

激光雷达探测精度高,具备全天时工作和垂直探测能力,在大气环境天基遥感领域应用广泛。基于CO_2柱线浓度激光遥感探测原理,分析了积分路径差分吸收星载激光雷达测量系统的激光波长、能量精度和稳定性及光轴指向精度等关键指标要求和功能模块配置,重点开展了星载激光雷达光机头部稳定安装、良好机热环境保障及星敏载荷一体化布局等整星层面系统设计保证,仿真结果初步表明设计方案可行。同时,提出了激光雷达波长、能量精度及稳定性实时监测、卫星对地光轴指向高精度测定和星地载荷光轴指向测量误差标定的地面试验验证要求,以确保系统设计的有效性,为激光雷达遥感卫星的研制提供了技术参考。

Satellite System Guarantee Technology for High Detection Accuracy and Stability of Space-Borne Lidar

Lidar has advantages of high detection accuracy, full-time working and vertical detection ability, and is widely used in the field of space-borne remote sensing of atmospheric environmental factors. In this paper, based on the remote sensing detection principle of global carbon dioxide cylindrical concentration, it analyses key index requirements and functional module configuration of the integration path differential absorption space-borne lidar measurement system, including the laser wavelength, energy accuracy and stability, and pointing accuracy of the optical axis. It focuses on stable installation conditions of optical payload, good thermal environment and the integrated layout of star sensors and payload to guarantee the system design. The simulation results preliminarily show that the scheme is feasible. Meanwhile, three verification requirements for ground experiments, which are the real-time monitoring of the wavelength and energy accuracy and stability, measurement of pointing accuracy and error calibration of the optical axis of satellite-ground payload, respectively, are put forward to ensure the effectiveness of the system design, which provides technical support for the development of the space-borne lidar remote sensing satellite.