To improve the lunar DEM accuracy derived from CE-1 altimeter data, CE-1 laser altimeter data are calibrated in this paper. Orbit accuracy and ranging accuracy are the two most important factors to affect the application of altimeter data in the lunar topography. An empirical method is proposed to calibrate CE-1 altimeter data, using gridded LOLA DEM to correct systematic errors of CE-1 altimeter data, and the systematic bias is about -139.52 m. A new lunar DEM grid model based on calibrated CE-1 altimeter data with the spatial resolution of 0.0625° × 0.0625° is obtained as well as a spherical harmonic model at 1400th order. Furthermore, the DEM accuracy is assessed through the comparison with the nearside landmarks of the Moon, and the results show that the DEM accuracy is improved from 127.3 m to 48.7 m after the calibration of laser altimeter data.

中文翻译：

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基于校准的Chang娥一号激光测高仪数据的新型月球DEM

为了提高从CE-1高度计数据得出的月球DEM精度，本文对CE-1激光高度计数据进行了校准。轨道精度和测距精度是影响高度计数据在月球地形中的应用的两个最重要的因素。提出了一种经验方法来校准CE-1高度计数据，利用网格化的LOLA DEM校正CE-1高度计数据的系统误差，系统偏差约为-139.52 m。根据校准的CE-1高度计数据，获得了空间分辨率为0.0625°×0.0625°的新月球DEM网格模型，以及第1400阶的球谐模型。此外，通过与月球附近地标的比较来评估DEM精度，结果表明DEM精度从127.3 m提高到48。