Airborne maneuvering target detection method based on time sampling reconstruction

Abstract

The invention provides an airborne maneuvering target detection method based on time sampling reconstruction. The method comprises the following steps: (1) S1: carrying out clutter suppression on overall echo data received by a radar; (2) S2: carrying out time sampling reconstruction by virtue of spatial sampling; (3) S3: carrying out FRFT (Fractional Fourier Transform) on the reconstructed data;and (4) S4: constructing cost functions and estimating a parameter result. The airborne maneuvering target detection method provided by the invention has the beneficial effects that on the basis of the thought of phase unwrapping in interferometric synthetic aperture radar (INSAR), time sampling reconstruction is carried out by virtue of spatial sampling, which is equivalent to increase of pulse points in a signal array element so as to improve the parameter estimation precision.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to an airborne maneuvering target detection method based on reconstruction time sampling. Background technique [0002] In modern warfare, mastering air supremacy is an important guarantee for winning the war, and airborne early warning radar plays a pivotal role in it. Since this kind of radar uses high-altitude aircraft as a carrier, the visual distance of the target to be detected, especially the low-altitude or ultra-low-altitude target, is much farther than that of ground-based radar, thus greatly increasing the warning time. However, compared with ground-based radars, airborne early warning radars are in a downward-looking working state, and they face more complex ground (sea) clutter problems. The clutter not only has a wide distribution range and high intensity, but also presents a two-dimensional coupling distribution. As a result, the target is often subme...

AI Technical Summary

Problems solved by technology

However, when using FRFT on ground-based radar and synthetic aperture radar (Synthetic Aperture Radar, SAR) to estimate maneuvering target parameters, more pulse points are needed, otherwise the estimation accuracy is difficult to meet the requirements

For this reason, it is difficult for the above method to be directly applied to airborne early warning radar, because when the radar pulse repetition frequency is constant, more pulse points mean that the CPI will be lengthened, which will cause clutter and the distance of the target to move, which will affect the follow-up processing. bring more difficulties

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