确定GPS接收机码间偏差的一种新算法

A new algorithm for determining GPS receiver's differential code bias

针对目前求解GPS接收机码间偏差(B)的主要方法(球谐函数模型法、曲面拟合模型法等)存在计算繁琐和效率不高等问题,研究并提出一种新的计算方法,即利用双频载波相位平滑伪距数据以及CODE提供的全球电离层VTEC地图和卫星B值,通过旋转地图内插VTEC以及伪距差分进行单站GPS接收机B值的解算。采用此方法和IGS跟踪站的观测数据解算GPS接收机的B值,并与CODE提供的跟踪站的B值进行比较,结果表明,这种新算法能够以优于0.4ns的精度确定GPS接收机的B值。

Major methods for determining a GPS receiver＇s differential code bias（ B）,including the spherical harmonic function model and surface fitting model,have a high degree of computational complexity and poor efficiency. Based on the pseudorange data with carrier phase smoothing,global maps of vertical total electron content（ VTEC） of the ionosphere,and satellite B values provided by CODE,this paper proposes a new algorithm for determining the single GPS receiver＇s B through interpolated VTECvalues from rotated maps and the pseudorange difference. The GPS receiver＇s B values were estimated with the proposed method and observed data at IGS tracking stations,and were compared with those at the tracing stations provided by CODE. The results show that the new method can determine the GPS receiver＇s B with an accuracy higher than 0. 4 ns.