Multi-channel blind source separation method for space micro-motion group target

Abstract

The invention discloses a multi-channel blind source separation method for a space micro-motion group target. The method solves a multi-channel blind source separation problem of a micro-motion warhead group target, and requires that the number of echoes received by radar is greater than or equal to the number of warheads in the group target. The method comprises the steps of firstly, transmittinga single-frequency pulse signal by the radar to obtain a plurality of micro-motion echoes of n warheads; randomly setting a positive definite mixed matrix to obtain n-dimensional hybrid signals, andpreprocessing the n-dimensional mixed signals; establishing a four-order cumulant matrix according to the processed mixed signals, performing joint diagonalization, and establishing an objective function; establishing a Givens rotation matrix, and finding a unitary matrix meeting the objective function, namely, a demixing matrix; and reconstructing source signals. According to the method, the four-order cumulant matrix is established by utilizing the characteristics that micro-motion warhead echoes have non-Gaussian characteristics and the cumulant of more than three orders of signals based onmultivariate Gaussian distribution is zero, joint diagonalization processing is carried out, and finally each micro-motion warhead echo is separated out.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a multi-channel blind source separation method for spatial micro-motion group targets. Background technique [0002] The flight trajectory of strategic ballistic missiles can be divided into: boost phase, middle phase and re-entry phase. Since the boost phase is within the detectable range of the enemy, and the flight time of the re-entry phase is relatively short, the warhead flight duration of the middle phase is longer and stable, which is the best stage for detecting enemy missiles. When the missile is flying in the middle stage, because there is no atmospheric resistance, most of the decoys and the fragments formed by the explosion of the mother warehouse will perform tumbling motions without an attitude controller. Precess or nutate, and fly according to the established orbit. In addition, since the ability of infrared radiation basically disappears in the middl...

AI Technical Summary

Problems solved by technology

For positive definite blind source separation, multiple radar receiving systems are usually used to receive the linear mixed signals of multiple targets, and the method of independent component analysis is usually used for signal separation, but the phase, amplitude and separation sequence of this method are different from the source signal. For target recognition, the amplitude problem can be normalized, and the separation order problem can be ignored. However, since the phases of the separated source signals are not all opposite, it is difficult to process the separated signals uniformly, and it cannot be used for subsequent target recognition. bedding

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