基于载波相位变率的GPS单站测速方法

针对目前常用的位置微分定速以及差分测速等方法的不足和局限性,提出了基于卡尔曼滤波估计载波相位变率的单站测速方法。相对于GPS接收机自身的多普勒频移,估计的载波相位变率更好的顾及了载体运动的特性和噪声平滑,通过实验数据解算,卡尔曼滤波估计的相位变率单站测速精度,在静态时段能达到亚cm/s级,动态时段能达到cm/s级。

Considering the shortcomings and limitations of position differential velocity determination and differential velocity determination by GPS, a single station velocity measurement method based on Kalman filter to estimate carrier phase variability is proposed. Compared with the Doppler frequency shift of GPS receiver itself, the estimated carrier phase variability takes better account of the characteristics of carrier motion and noise. Through the experimental data, the accuracy of single point velocity determination based on the carrier phase change-rate variability accuracy estimated by Kalman filter can reach sub-cm/s level in static time, and can reach cm/s level in a dynamic time.