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航宇局戈达德空间飞行中心有两台正在使用中的脉冲激光系统,用于跟踪近地人造卫星。这种卫星上装有后向角反射器。这种系统测得的距离噪声级约为1～2米。以每秒一次重复频率测量所得到的误差互相之间没有关系。在白昼,如同在夜晚的情况下一样,也成功地进行了跟踪,距离噪声的增加不大。利用国家测地卫星GEOS Ⅰ和GEOSⅡ,这两台系统的测距精度优于3米。距离精度是通过比较得到的:将激光测距结果同照象法和多普勒法得到参考轨道所计算的结果进行比较;将两台激光系统的测量结果一起进行比较;将激光系统与AN/FPQ-6c波段雷达所测量的数据一起进行比较。
NASA Goddard Space Flight Center has two pulsed laser systems in use to track near-Earth artificial satellites. This satellite is equipped with retroreflector. This system measures the distance noise level of about 1 to 2 meters. Errors measured at one repetition rate per second are not related to each other. During the day, as in the case of the night, tracking was also successful with little increase in noise. Using the national geodetic satellites GEOS I and GEOS II, the ranging accuracy of these two systems is better than 3 meters. The accuracy of the distance was compared by comparing the result of the laser ranging with that of the reference orbit obtained by the imaging and Doppler methods. The results of the two laser systems were compared together. The laser system was compared with the AN / The data measured by the FPQ-6c band radar are compared together.