Anti-interference method of dsss receiver based on open-loop adaptive filtering

Abstract

The invention discloses a DSSS receiver different-address interference resisting method based on open-loop adaptive filtering. The method comprises the following steps: 1, arranging an iteration frequency upper limit and an initial value W<k,init><->(l) of a filter coefficient W<k ><->(l); 2, a filtering module filtering receiving signals by use of the W<k,init><->(l), taking a filtering result x<k><^><l> as estimation of a range image x<k>(1), and adding one two iteration frequency; 3, a correlation function calculation module receiving the x<k><^><l>, and carrying out range distance correlation function estimation so as to obtain rho <k>(1,0), rho <k>(1,L) and rho <k>(1,-L); 4, a filter coefficient calculation module receiving the rho <k>(1,0), the rho <k>(1,L) and the rho <k>(1,-L), and calculating a new W<k ><->(l) for outputting to a filtering module; 5, the filtering module updating the W<k ><->(l), filtering the receiving signals so as to output a new filtering result x<k><^><l> as new range image estimation, adding one to the iteration frequency, if the iteration frequency reaches the iteration frequency upper limit, executing the sixth step, otherwise, outputting the new filtering result x<k><^><l> to the correlation function calculation module, repeating the third step to the fifth step, and beginning a new round of iteration filtering processing; and 6, ending adaptive filtering on the receiving signals, and outputting the x<k><^><l>. According to the invention, inhibition of cross correlation caused by different-address interference can be realized.

Description

technical field [0001] The invention belongs to the field of aerospace technology, and in particular relates to an open-loop adaptive filter-based DSSS receiver anti-different location interference method. Background technique [0002] Direct Sequence Spread Spectrum (DSSS) signals have the advantages of high concealment, anti-interception, and strong interference capabilities, and have been widely used in satellite navigation and positioning systems, aerospace measurement and control communication systems, and civil communications. The DSSS receiver realizes the detection and synchronization of the received signal by using the correlation characteristics of the modulated pseudo-code in the DSSS signal. However, since the pseudocode sequences assigned by different users are not completely orthogonal, their cross-correlation function is not zero, resulting in cross-site interference among users. When the interference power of different sites is large, the performance of the ...

AI Technical Summary

Problems solved by technology

However, the existing RMMSE algorithms are all designed for radar pulse signal models, and are not suitable for DSSS signal models with continuous waveform characteristics, thus limiting their application in DSSS receivers in the aerospace field

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