A Bandwidth Adaptive Pseudo-Code Tracking Loop Design for BD / INS Integrated Navigation

In modern Beidou satellite communications receivers, a simple pseudo-code tracking loop has been unable to meet pseudo-code synchronization in high dynamic, strong interference environments. In such environment, the traditional combinations cannot make pseudo-code tracking loop to achieve optimal performance, thus the integrated navigation has become a development direction. In this paper, an error estimation module has been added based on the traditional BD/INS integrated navigation system. The module uses time from integral accumulator and the signal to noise ratio and acceleration from initial data module estimating the minimum tracking error of pseudo-code tracking loop. The bandwidth selection signals generate by the module feedback to the initial data processing module adjusting the bandwidth in the initial data processing module. The design makes the pseudo-code tracking loop adjust bandwidth in real time based on high dynamic environmental conditions, so it will enhance environmental adaptability of the pseudo-code tracking loop and improve the performance of the pseudo-code tracking loop.