利用GPS信号信噪比反演土壤湿度变化  

Remote sensing of soil moisture variation using signal to noise ratio of GPS signals

作　　者：王一枫[1] 何秀凤[1] 季君 

机构地区：[1]河海大学卫星及空间信息研究所,江苏南京210098 [2]南通市海洋与渔业局海籍调查测量中心,江苏南通226018

出　　处：《河海大学学报（自然科学版）》2014年第1期62-66,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(40974001);江苏省研究生科研创新计划(CXZZ11-0451)

摘　　要：采用右旋圆极化(RHCP)天线和左旋圆极化(LHCP)天线分别接收GPS直接信号与反射信号,跟踪反射点并探测土壤粗糙度,并用小波分析方法对土壤干燥区域与湿润区域反射信号的信噪比进行去噪分析,验证GPS信号对土壤湿度变化敏感的特性。试验结果表明,利用GPS反射信号可精确跟踪地面反射点,并且GPS反射信号信噪比的大小可以反映土壤湿度变化。The right hand circular polarization （ RHCP ） antenna and left hand circular polarization （ LHCP ） antenna were used to receive direct GPS signals and reflected GPS signals , respectively .The reflection points were tracked and the soil roughness was detected .The GPS signals were verified to be sensitive to the variation of the soil moisture through de n-oising analysis of the signal to noise ratio of the reflected GPS signals with the wavelet method in the dry region and wet region .The results show that the reflection points can be precisely tracked with the reflected GPS signals , and the signal to noise ratio of the reflected GPS signals can reflect the variation of the soil moisture.

关 键 词：反射点 土壤粗糙度 土壤湿度变化 信噪比 

分 类 号：P228.1[天文地球—大地测量学与测量工程]