The Research On The Anti Interference Cancellation Technique Of Beidou Navigation Receiver

With the continuous development of the global satellite navigation system, satellite navigation has been widely applied to military construction, daily life and many other fields due to its high accuracy, real time, large coverage and many other characteristics. Beidou navigation satellite system is developed independently by our own country, always face the threat of a variety of interference, in order to ensure its role in various fields, it is imperative to improve its anti-jamming performance.This paper is based on the research background of the Beidou dual frequency antiinterference antenna, and the anti-interference processing ability of the RNSS-B1 and RDSS-S frequency is the key point of the research. Firstly, the theory analysis of the antiinterference algorithm is carried out, then apply the algorithm to the prototype of the antenna. Complete the development of anti-interference antenna by adopting the combination of theory and practice.First is to analyze the interference and anti-interference technology of the Beidou navigation satellite signal, then study the theory of array signal processing, and derive the mathematical model of different element arrangement. Second, analyze the structure principle of spatial adaptive filtering technique, research on the adaptive iterative algorithm and optimization guidelines of the filter. Third, extend the spatial filtering model to spacetime anti-interference filtering model, in this model, carried out the simulation analysis based on power inversion algorithm for linear constrained minimum variance criterion. Then, the anti- interference algorithm is implemented on FPGA, use the Verilog HDL code, and use the Signal Tap II Logic Analyzer to collect and analyze the data. In the process of implementation, calculate the maximum value of the diagonal elements of the covariance matrix, and obtains its highest bit, which will be the starting position of the truncation, to retain the maximum degree of effective number of the matrix. Finally, verify the algorithm in the actual experimental environment, through the satellites searching and positioning ability of the antenna.Through Matlab simulation and practical experiment results, it can be concluded that the space-time algorithm based on the power inversion array can make the dual frequency anti-interference antenna have good anti-interference effect in the environment of multiple interferences.