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为了提高红外地球敏感器的地面测试与标定精度,以地球模拟器能够精确达到技术指标为目的,对地球模拟器光学系统进行研究。在光学系统中将地球光阑放于锗准直透镜的焦平面附近,使得通过地球光阑的光入射到锗准直透镜后,以平行光出射到红外地球敏感器上。同时根据卫星在同步轨道、更高轨道和较低轨道所使用的红外地球敏感器地面标定试验的需求,采用更换地球光阑的方案,提供了三种不同的地球张角。计算结果表明,地球模拟器边缘处成像清晰,且三种不同轨道的地球张角误差均小于±0.05°。该方案设计的地球模拟器可准确在地面上模拟卫星在太空中所看到的地球,满足了地球模拟器的整体性能要求。
In order to improve the ground testing and calibration precision of the infrared earth sensor, the earth simulator optical system is studied for the purpose of accurately reaching the technical index of the earth simulator. In the optical system, the earth diaphragm is placed near the focal plane of the germanium collimating lens, so that the light passing through the earth diaphragm enters the germanium collimating lens and then emerges as parallel light onto the infrared earth sensor. At the same time, according to the requirements of the ground calibration test of the satellite used in geosynchronous orbit, higher orbit, and lower orbit, the scheme of replacing the globe aperture provided three different earth angles. The calculation results show that the image of the edge of the earth simulator is clear, and the errors of earth angles of the three different orbits are less than ± 0.05 °. The program designed Earth Simulator accurately simulates the earth seen by the satellite in space on the ground and meets the overall performance requirements of the earth simulator.