一种卫星激光测高仪测距精度仿真计算方法

发布时间：2018-02-01 17:20

本文关键词： 卫星激光测高仪测距精度全波形复杂地形人工选点　出处：《航天器工程》2016年03期 　论文类型：期刊论文

【摘要】：针对卫星激光测高仪在测绘应用中的测距精度计算问题,提出一种测距精度全链路仿真计算方法。方法包括回波仿真、回波处理与精度计算,模拟了测距结果从获取到使用的整个过程,考虑了包括回波处理算法在内的所有影响测距精度的环节。在经典回波模型的基础上,增加了对数字表面模型(DSM)采样间隔的限制条件,以避免选用采样间隔过大的DSM进行仿真导致仿真准确度下降的问题。利用对可见光遥感图像信息进行人工多次选点并取均值的方法,解决真实地形中测量点与卫星之间距离真值的确定问题。将仿真得到的回波数据及精度计算结果与"冰卫星"(ICESat)回波数据及实际测距精度进行比对,结果表明:仿真得到的回波波峰位置和测距随机误差与"冰卫星"的一致,从而验证了仿真计算方法的正确性。
[Abstract]:In order to solve the problem of ranging accuracy calculation of satellite laser altimeter in surveying and mapping application, a method of full link simulation of ranging accuracy is proposed, which includes echo simulation, echo processing and precision calculation. The whole process from acquisition to use of ranging results is simulated, and all the links affecting ranging accuracy, including echo processing algorithm, are considered. Based on the classical echo model. The limited condition for sampling interval of digital surface model (DSM) is added. In order to avoid the problem that the DSM with too large sampling interval leads to the deterioration of simulation accuracy, the method of manually selecting points and taking the mean value of the remote sensing image information of visible light is used. To solve the problem of determining the true value of distance between measured points and satellites in real terrain. The echo data obtained by simulation and the precision calculation results are compared with the "ice satellite" ICESat). Echo data and actual ranging accuracy are compared. The results show that the position of echo peak and the random error of ranging are consistent with those of "ice satellite", which verifies the correctness of the simulation method.
【作者单位】：北京空间飞行器总体设计部;
【分类号】：V447.1
【正文快照】： 1引言测绘卫星的几何分辨率和水平测绘精度在不断提高,但高程精度仍很低,如世界观测-2(World-View-2)卫星的高程精度为5m,我国资源三号卫星无控制点高程精度约为10m[1]。研究表明,激光复合测绘方法利用卫星激光测高仪获取的具有一定精度的激光测距数据参与到立体平差后,测绘卫

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