Precession target two-dimensional imaging method based on equivalent scattering points

Abstract

The invention discloses a precession target two-dimensional imaging method based on equivalent scattering points, which comprises the following steps of: (1) receiving echo by radar; (2) performing speed compensation; (3) performing time frequency analysis; (4) updating speed; (5) updating coning frequency; (6) judging whether the optimal offset is equal to an initial value; (7) performing two-dimensional imaging; and (8) outputting an imaging result. The time frequency spectrum of the coning target with different parameters is integrated and reconstructed with a speed and coning frequency cyclic iteration method through the echo pulse pressure process, the speed compensation and the micro-motion parameter estimation, the accurate value of the parameter is searched and obtained by taking the average intensity maximum of the image as a criterion, and finally, the two-dimensional image of the target is obtained with a coherent single distance Doppler interferometry. The method has the advantages of realizable two-dimensional imaging of the space precession coning target and accurate estimation on the target size and motion parameters.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a two-dimensional imaging method for a precessing target based on equivalent scattering points in the technical field of radar signal processing. The invention can effectively perform two-dimensional imaging on the space precession cone target, estimate the size and motion parameters of the target, and provide a strong guarantee for subsequent target recognition. Background technique [0002] When the smooth-surfaced cone target flies in space at high speed, in order to maintain the stability of attitude, it needs to do spin motion. When it is disturbed by the lateral direction, the spin will be converted into the form of precession. Because the Doppler modulation produced by the precessing target on the echo signal is time-variant, the traditional inverse synthetic aperture radar imaging method based on the turntable model is no longer applicable to the precessing ta...

AI Technical Summary

Problems solved by technology

This method overcomes the inability of the coherent single-range Doppler interferometry to accurately image the target when there is an error in the target parameter estimation, and uses the characteristic that the coherent integral value of the time-frequency spectrum is related to the matching degree of the model. The frequency loop iterative method is used to reconstruct the time-frequency spectrum of the precession cone target based on the equivalent scattering point model under different parameter values. Based on the maximum average intensity of the image, the precise value of the parameter is obtained by searching and finally using Coherent single-range Doppler interferometry to obtain two-dimensional images of cone targets

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