岸基北斗IGSO卫星反射信号相位测高

针对全球导航卫星系统反射信号的特性和我国北斗导航卫星系统反射信号在海面测高应用上的特点,证明了利用北斗倾斜地球同步轨道(IGSO)卫星反射信号对湖面和海平面进行岸基载波相位测高的可行性。实验分湖面和海面2组进行研究,用相位测高结果与实际测量结果对比的均方根误差(RMSE)描述测高结果的精度。在湖面岸基实验中,接收天线到湖面的相对高度为5.2m,IGSO7和IGSO10卫星相位测高结果的RMSE值达到厘米级,分别为3.23cm和4.98cm。在海面岸基实验中,海面的潮位高度差约2m,利用相位测高结果可以反演海面潮位。IGSO8卫星相位测高结果的RMSE为17.96cm,IGSO9卫星相位测高结果的RMSE为15.27cm,IGSO10卫星相位测高结果的RMSE为16.38cm。通过分析IGSO卫星仰角的变化,发现较大的卫星仰角变化率可以提高相位测高的结果的精度。

Feasibility of Coastal Phase Altimetry Using BeiDou IGSO Satellite Reflected Signals

Aiming at the characteristic of global navigation satellite system reflected signals and the sea suface altimetry using BeiDou navigation satellite system reflected signals,this study was to prove the feasibility of coastal phase altimetry using BeiDou inclined geosynchronous orbit(IGSO)satellite reflected signals.Two experiments were carried out,the lake surface and the sea surface.The accuracy of the phase altimetry result was described by the root mean square error(RMSE)comparing the phase altimetry result with the actual measurement result.In the lake coastal experiment,the difference between the antenna and Lake Surface was set to 5.2 m,and both RMSE values(5 min average)of IGSO7 and IGSO10 altimetry results reached the centimeter level:3.23 cm and 4.98 cm.In the sea coastal experiment,the difference between high tides and low tides was approximately 2 m,and all of the phase altimetry results can inverse the tide.In these phase altimetry results,the RMSE of the IGSO8 altimetry results was 17.96 cm,the RMSE of the IGSO9 altimetry results was 15.27 cm,and the RMSE of the IGSO10 altimetry results was 16.38 cm during certain periods.Moreover,the impact of the elevation variation of the IGSO satellite for phase altimetry in our ocean experiment was analyzed.Larger elevation change rate can improve the accuracy of phase altimetry results.