Weakening Test of Pseudo-range Bias Based on Parameters-Constrained of BDS Monitoring Receiver

Abstract

Due to the influence of many factors, such as the difference of satellite navigation load device characteristics, space transmission, ground multipath and so on, the navigation signal arriving at the ground presents non-ideal characteristics and the difference between satellites, which results in the pseudo range bias of different satellites by the monitoring receiver. Moreover, the difference of technology status further results in the in conformity of pseudo-range bias of the same satellite by the monitoring receiver, the processing errors of precise orbit determination, satellite clock error correction and other services become larger, which affects the improvement of system spatial signal accuracy and the implementation effect of satellite based Augmentation services (SBAS). First this paper analyzes the effect to the pseudo-range bias due to the receiver’s parameters. The result of analysis shows that the receiver’s parameters more effects pseudo-range bias of navigation signals with low code rate such as 1 Mcps, 2 Mcps than with high code rate such as 8 Mcps, 10 Mcps, which can be neglected. Afterwards, the paper gives weakening test of pseudo-range bias with 3 BeiDou monitoring receivers from different manufacturers, different hardware architectures and different technology status by observing the space navigation signal. The test results show that the value of pseudo-range bias of BeiDou’s B1C, B2a can be reduced from about 2 ns to within 1 ns and about 0.5 ns to within 0.4 ns by constraining and readjusting the filter bandwidth and loop correlator spacing of the monitoring receiver.