Passive bistatic radar signal processing method based on dimension reduction constant modulus blind equalization

Abstract

The invention discloses a passive bistatic radar signal processing method based on dimension reduction constant modulus blind equalization. The passive bistatic radar signal processing method comprises the following steps: S101: restoring direct wave signals in signals received from a reference passage of a passive bistatic radar by using a constant modulus blind equalization method after dimension reduction; S102: according to the signals received from a monitoring passage of the passive bistatic radar, performing multidiameter self-adapting wave filtering processing on the direct wave signals by using a smallest mean square error algorithm; S103: estimating a doppler time delay cross-correlation detection objective of a distance between the signals obtained through the multidiameter self-adapting wave filtering processing and the direct wave signals. The passive bistatic radar signal processing method disclosed by the invention uses the energy sum of weight vectors and percentage as a threshold, omits an undersize weight vector coefficient, and can effectively decrease the number of the weight vectors participating in iteration, so that the calculated amount of the algorithm is reduced.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a passive bistatic radar signal processing method based on dimensionality reduction and constant modulus blind equalization. Background technique [0002] Direct wave recovery is the key technology of passive bistatic radar. However, it is difficult to restore the direct wave in severe multipath environments. Some of the existing technologies adopt digital beamforming technology, which has a certain suppression effect on the multipath arriving from the side lobe, but cannot suppress the multipath signal entering from the main lobe. In the prior art, the constant modulus blind equalization algorithm is also used to suppress multipath and restore the direct wave. However, due to severe multipath, the weight vector of the constant modulus algorithm is too long, and the amount of calculation increases, which is not conducive to system implementation. Contents of th...

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Problems solved by technology

However, in severe multipath environments, it is difficult to recover the direct wave

Some of the existing technologies use digital beamforming technology, which has a certain suppression effect on the multipath arriving by the side lobe, but cannot suppress the multipath signal entering the main lobe

In the existing technology, the constant modulus blind equalization algorithm is also used to suppress multipath and restore the direct wave. However, due to severe multipath, the weight vector of the constant modulus algorithm is too long, and the amount of calculation increases, which is not conducive to system implementation.

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