基于有源定标器的卫星雷达高度计近海测高基准重建方法研究

Research on the Method of Re-construct Satellite Radar Altimeter Measurements Datum over Coastal Waters based on Transponder

利用卫星雷达高度计开展高精度近海高度测量面临诸多问题，重构受污染的近海回波波形，建立近海测高基准是实现高精度近海高度测量的重要基础。介绍一种利用有源定标器重建卫星雷达高度计近海测高基准的方法，以HY-2卫星雷达高度计为例，分别分析了离岸距离大于20km、离岸距离小于2km及离岸距离处于2～20km之间处近海地区雷达高度计回波波形受影响情况，并从理论上推导了该方法建立近海测高基准的精度。在2012年7月5日唐山近海地区HY-2高度计在轨定标试验中，首次观测到近海地区有源定标器转发高度计信号的回波波形，结果表明：利用有源定标器重建卫星雷达高度计近海测高基准的方法可行，该方法将有助于提高近海测高精度。

High precision coastal altimetry by using satellite radar altimeter faces many problems, re-con- struction of satellite radar altimeter＇s coastal return waveforms are contaminated by the return waveforms from the land and building satellite radar altimeter measurements datum over coastal are key to improve accuracy of coastal altimetry. Introducing a method of re-construct satellite radar altimeter measurements datum over coastal waters based on transponder, taking HY-2 satellite radar altimeter as an example, re- spectively analyze satellite radar altimeter＇s coastal return waveforms are contaminated in coastal waters of more than 20km offshore distance,less than 2km offshore distance and 2~20 km offshore distance,then in- duce the accuracy of building satellite radar altimeter measurements datum over coastal waters in the theo- ry.The HY-2 radar altimeter＇s return waveforms data acquired from July 5,2012 in Tangshan＇s coastal waters in the in-orbit calibration test,firstly observe HY-2 radar altimeter＇s return waveforms forworded by transponder over coastal waters, the results show that：the feasibility of the method presented in this pa- per is verified, the method will help to improve accuracy of coastal altimetry.