利用北斗GEO卫星反射信号反演土壤湿度

发布时间：2018-04-06 07:23

本文选题：全球导航卫星系统　切入点：反射信号处理　出处：《测绘学报》2016年02期

【摘要】：提出了一种基于北斗GEO卫星反射信号的土壤湿度长期连续探测方法,建立了土壤湿度反演模型,给出了信号处理的一般流程,并搭建陆基接收平台进行了验证试验。该方法采用GNSS-R双天线体制接收处理北斗GEO卫星直射和土壤反射信号,在信号同步的基础上提取信号功率并计算土壤反射率,进而根据反演模型得到土壤湿度。以北斗GEO卫星作为信号源,该方法可以在信号处理中省去一般GNSS-R处理过程的定位解算环节,能够实现对固定区域土壤湿度的长期连续观测。试验结果表明,基于北斗GEO卫星反射信号的土壤湿度反演结果在时间和数值上均具有良好的连续性,与土壤湿度参考值相吻合,均方根误差达到0.049,较北斗IGSO和GPS MEO卫星在反演土壤湿度方面性能更优。
[Abstract]:A long-term continuous detection method of soil moisture based on the reflected signal of Beidou GEO satellite is proposed. The inversion model of soil moisture is established and the general process of signal processing is given.In this method, GNSS-R dual-antenna system is used to receive and process beidou GEO direct and soil reflectance signals. The signal power is extracted on the basis of signal synchronization and soil reflectivity is calculated, and then soil moisture is obtained according to the inversion model.Using Beidou GEO satellite as signal source, this method can eliminate the location calculation of general GNSS-R processing process, and realize the long-term continuous observation of soil moisture in fixed area.The experimental results show that the inversion results of soil moisture based on Beidou GEO satellite reflection signal have good continuity in both time and value, and are in good agreement with the reference values of soil moisture.The root mean square error (RMS) is 0.049, which is better than Beidou IGSO and GPS MEO in retrieving soil moisture.
【作者单位】：北京航空航天大学电子信息工程学院;山东省泰安农业气象试验站;
【基金】：国家863计划(2013AA122402)~~
【分类号】：S152.71

【相似文献】