基于小波变换的GPS载波相位周跳检测与修复

载波相位周跳检测与修复是实现GPS高精度定位的难点之一。小波变换具有空间局部性好的特点,本文利用小波变换把载波相位观测量分解为高频和低频分量,提出了利用小波系数局部极值点检测相位周跳的方法。基于载波相位和多普勒频率共同约束的埃尔米特多项式,外推周跳时刻载波相位,与观测值比较确定周跳的大小,从而修复周跳。利用飞机实际观测数据和仿真的高动态数据进行了计算,给出了计算结果,表明该方法可以对高动态情况下载波相位周跳进行准确探测和修复。

Detecting and Repairing GPS Carrier Phase Cycle Skip Using Wavelet Transform

Detecting and repairing GPS carrier phase cycle skip is a challenge for precise GPS position.Because wavelet transform has a good local property,GPS carrier phase data is divided into high frequency part and low frequency part by wavelet transform.A method using wavelet coefficient extremum to detect carrier phase cycle skip is put forward.The carrier phase observations at cycle skip times are estimated by Hermite polynomial confined by carrier phase observables and Doppler frequency observables.Compared with the carrier phase observables directly obtained by GPS receiver,the cycle skips are determined and repaired.The real observation data obtained by airplane and high dynamic simulation data are processed in this manner.Means and results are given.It shows that this approach can be used to precisely detect and repair carrier phase cycle skips under high dynamic conditions.