嫦娥一号激光高度计数据交叉点分析与平差处理

本文对嫦娥一号激光高度计进行了轨道交叉点分析和平差方法研究。根据获取的912万个激光高度测量点进行交叉点计算，产生了整个月球表面140多万个轨道交叉点，对交叉点的位置分布特点与交叉点不符值的时间分布特性进行了系统分析，并运用4种基于时间的函数模型对交叉点不符值进行平差处理和对比分析。在试验区(0°N~60°N, 50°W~0°W)内，4种交叉点平差模型均能使交叉点高程不符值中误差从平差前的62.1m降至37m以内，在此基础上产生的DEM条带现象消失或减弱，表明交叉点平差能明显改进DEM的质量。

Crossover Analysis and Adjustment for Chang'E-1 Laser Altimeter Data

This paper presents a preliminary result of crossover analysis and adjustment of Chang’E-1(CE-1) Laser Altimeter (LAM) data of the Moon. With about 9.12 million altimetric points acquired by the laser altimeter, we derived more than 1.4 million crossovers covering the entire lunar surface after eliminating outliers of orbits and altimetric points. The distribution of crossover points, the differences of crossover and the relationship with time have been systematically analyzed. Least-squares crossover adjustments with four basis functions of time (trigonometric functions and polynomials) are developed and compared to reconcile the LAM data by minimizing the crossover residuals globally. In a study area (0°N~60°N, 50°W~0°W), the crossover residuals can be reduced from 62.1m to lower than 37m with anyone of the four models. The artefacts are reduced and the quality of the DEM generated from the adjusted LAM data is improved accordingly.