Kalman滤波估计GPS载波相位变率的测速方法与实现  

METHOD OF VELOCITY MEASUREMENT BY GPS CARRIER PHASE-RATE ESTIMATED FROM KALMAN FILTER AND ITS IMPLEMENT

作　　者：田良辉[1,2] 刘根友[1] 郭爱智[1,2] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室,武汉430077 [2]中国科学院研究生院,北京100049

出　　处：《大地测量与地球动力学》2011年第1期72-77,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40974013);国家863计划项目(2006AA06A202)

摘　　要：利用差分测速和Kalman滤波估计相位变率方法对某次航空重力测量的飞行数据进行了解算,通过与GT-1A自带的GPS高精度定位测速软件和WAY-Point软件比对分析,结果表明:采用Kalman滤波估计相位变率的GPS差分测速,能够适应较复杂的运动模式,定速精度达到mm/s级,高于WAY-Point软件的动态测速精度。The accuracy of moving carrier’s velocity,which was determined by GPS,depends on mainly accuracy of carrier phase-rate.It is difficult to guarantee accuracy of velocity with raw Doppler and differential phase.Carrier phase-rate estimated from Kalman filter was adopted to determine the velocity instead of Doppler.The model and theory of differential velocity measurement and carrier phase-rate estimated by Kalman filter were introduced.The flight data of a certain airborne gravimetry were calculated with Kalman filter method,and the results were compared with those from GT-1A and WAY-Point.It is indicated that GPS carrier phase-rate estimated from Kalman filter can be adapted to some high-velocity and more complicated movements,its accuracy of velocity measurement can achieve at mm/s level,the result approaches to that by GT-1A and is higher than that with WAY-Point.

关 键 词：多普勒 载波相位变率 GPS 差分测速 KALMAN滤波 

分 类 号：P228[天文地球—大地测量学与测量工程]