Anti-multipath Tracking Technology Research Of BOC(n,n) Signals

In recent years, with the vigorous development of satellite navigation, many countries have developed its own satellite navigation system, which made navigation signal band increasingly crowded. In order to achieve spectrum sharing and performance improvements, a new generation of satellite navigation system came into being and adopted by a number of countries in their modernization of satellite navigation systems program. The BOC signal in new system brings a number of enhancements, while, because of its own characteristics, it put forward higher requirements for anti-multipath performance of positioning receivers using anti-multipath technology. The purpose of this research is to design and implementation a new anti-multipath tracking loop for the new navigation signal and come up with a new system most suitable anti-signal multipath technology.Firstly, we compared signal generation mode, the autocorrelation function and power spectral density between the new signal system and the traditional production methods BPSK signal. Then, we analyzed the characteristics of Multipath phenomenon through studying many-path model and pointed out the impact on tracking loop.Based on the above, this paper presented four anti-multipath technology: Principles narrow related technology, Double-Delta technology, ELS technology and MEDLL technology. After that we found the MEDLL algorithm has better performance by analyzing their principle and performance.This paper focuses on the realization method of track loop using MEDLL technical, the simulation using MATLAB and applying to a receiver. Firstly, we introduced MEDLL algorithm implementation process and the structure tracking loop. Secondly, the simulation results show the correctness of the tracking loop and the feasibility of BOC(n,n) signal multipath tracking using MEDLL technology. Finally, the implementation of such tracking loop in receivers and the test results were give out.