Research on Monitoring and Evaluating Method of Beidou Monitoring Receiver Inter-frequency Bias

Abstract

With the development of new global navigation satellite system applications, the demand of high accurate positioning navigation timing (PNT) service becomes urgent. For precise PNT, the hardware delay is regarded as an important parameter in the satellite navigation message. Instead of using the absolute receiver hardware delay, a method based on receiver inter-frequency bias (DCB, Differential code biases) calibration is presented to deal with the rank deficiency of a calculation matrix and to reduce jumps in DCB solutions in BDS. The current DCB estimation methods generally require the elimination or estimation of ionospheric delay error. Thus the error of modeling and mapping errors will influence the accuracy of DCB. In the paper, a method based on the difference of dual-frequency ionosphere-free code observations is proposed to monitor and evaluate the DCB of receiver, inter-frequency bias (IFB). Using it, the IFB of BDS can be computed. A one-year three-frequency BDS data set is processed to estimate the IFB. The results show that this algorithm can be used to estimate IFB effectively, the accuracy is better than 1 ns.