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以嫦娥三号探测器的三向测量跟踪数据为依据,利用最小二乘方法分析站间钟差,在5阶拟合计算中实现了ns级的拟合精度;然后使用探测器精密星历对三向测轨数据进行标校,经过修正后的测距系统差达到10m量级,拟合噪声水平优于1m;最后将三向测量数据应用于探测器的定轨、着陆点定位和动力下降段的弹道计算,其中环月段100km×15km轨道计算结果与精密定轨相比较偏差百m级,120km×70km轨道计算结果与精密定轨相比较偏差10m量级,月面定位与双程测距加时延定位结果相比较偏差10m量级。
Based on the three-way measurement and tracking data of Chang’e III detector, the least squares method was used to analyze the clock error between stations, and the fitting accuracy of ns level was achieved in the fifth-order fitting calculation. Then, Three-way orbit data calibration, after the correction of the ranging system to the order of magnitude of 10m, the fitting noise level is better than 1m; Finally, the three-way measurement data used in the orbit determination, landing point positioning and power down The trajectory calculation of 100km × 15km in the lunar month is offset by 100 m compared with the precision orbit determination. The orbit calculation result of 120km × 70km deviates from the precision orbit by 10m, Distance plus time delay positioning results compared to the order of 10m.