Variational Bayesian inference-based high-speed target HRPP reconstruction method

Abstract

The invention belongs to the field of radar signal processing, and relates to a variational Bayesian inference-based high-speed target HRPP reconstruction method. The method comprises the following steps of S1, carrying out sparse representation modeling on a target undersampled echo; S2, reconstructing a target HRPP through a variational Bayesian inference; and S3, estimating a target speed on through a newton iteration-based minimum entropy method: S3.1, calculating a first derivative, about the target speed, of an image entropy, S3.2, calculating second derivative, about the target speed, of the image entropy, and S3.3, estimating the target speed through a newton iterative. Through the method, high-speed moving target HRRP reconstruction under undersampling condition can be realized, target speeds can be effectively estimated from undersampled echoes under the condition of radar echo undersampling caused by the factors such as low signal to noise ratio, strong interference and thelike, and high-order phase errors imported by the target speeds can be compensated, so that distortions such as widening, defocusing and the like of target HRRPs are corrected, the target HRRPs with good focusing effect and high resolution are obtained, and an important engineering application value is provided for radar target recognition.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a high-resolution one-dimensional range profile (High Resolution Range Profile, HRRP) reconstruction method of a high-speed target based on variational Bayesian inference. Background technique [0002] High-resolution one-dimensional range profile (HRRP) is the projection of target scattering center in the direction of radar line of sight (LOS). It is the basis of inverse synthetic aperture radar (ISAR) imaging and can be used to estimate the size of the target in the direction of radar LOS. It is a radar An important technical approach of target recognition has been widely used in space target surveillance, missile defense, aviation control and other fields. [0003] For a high-speed moving target, its HRRP will be affected by the high-order phase error caused by the speed, showing distortions such as broadening and defocusing, resulting in a decrease in resolu...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that under the condition of under-sampling, the estimation accuracy of the speed of the high-speed moving target decreases, resulting in a decrease in the quality of HRRP, which is difficult to meet the actual needs of the project

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