A Zero Notch Widening Method under High Dynamics

Abstract

The present invention is a high dynamic null widening method, comprising: obtaining the sampling data of the received signal of the array antenna, performing band-pass filtering, Hilbert transform and amplitude-phase correction, extracting the obtained sampling data at equal intervals, and then outputting them in two channels, one of which is Input FIFO module storage, and the other channel is extracted at equal intervals, and then sent to the QR decomposition unit for covariance matrix estimation, and the updated covariance matrix is ​​output; forward iterative update of intermediate variables, according to the updated covariance matrix and intermediate variables Perform backward iterative calculations to obtain updated optimal weights; the sampled data of the estimated covariance matrix stored in the FIFO module is multiplied and added with the updated optimal weights, and then filtered and output. The invention equivalently expands the interference null, enhances the stability of filtering, and implements FPGA to enhance the stability of filtering.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and relates to a zero trap widening method under high dynamics. Background technique [0002] With the development and application of satellite communication technology, the problem of narrow-band or wide-band suppressive interference faced by its receivers has become increasingly prominent. Receivers based on array signal processing technology can adaptively eliminate these interferences by adjusting the weighted complex coefficients of each receiving array element. In engineering implementation, the LMS algorithm and the SMI algorithm are often used for adaptive filtering. The LMS algorithm is simple to implement and has a small amount of calculation. The engineering implementation was carried out earlier, but the convergence performance of the algorithm is greatly affected by the eigenvalue distribution of the correlation matrix. Therefore, the ability to suppress strong inter...

AI Technical Summary

Problems solved by technology

The literature "Analysis of the Influence of Platform Motion on the Performance of Antenna Array in Satellite Navigation System" analyzes the influence of platform motion on the anti-jamming performance of the adaptive array. According to the characteristics of the machine, a statistically based space-time null widening method is proposed, but this method needs to multiply an expansion matrix on the basis of the original covariance matrix, and the implementation process is complicated

Images