Method for detecting spread target based on phase compensation processing

Abstract

The invention relates to a method for detecting a spread target based on phase compensation processing. The method comprises the following steps of: 1, producing a high-resolution one-dimensional range image of the spread target, namely performing matched filtering on a linear frequency-modulated wave signal of a high-resolution radar to acquire the one-dimensional range image of the spread target; 2, performing the phase compensation processing on an echo sequence of the spread target; 3, accumulating energy of the spread target, namely performing in-phase stacking on the amplitude of strongscattering point signals in the one-dimensional range image of the spread target; and 4, detecting the spread target by using a cell average-constant false alarm rate (CA-CFAR) detector. In the process, all types of work aim to enhance the detection capability of the spread target so as to correctly detect the spread target.

Description

technical field [0001] The invention relates to an extended target detection method based on phase compensation processing, in particular how to improve the detection probability of the extended target by using the phase distribution characteristics of the extended target in the broadband high-resolution radar echo signal, and belongs to the field of radar signal processing. Background technique [0002] With the development of space detection technology, broadband high-resolution radar has become an important direction of modern radar system research. The increase of radar bandwidth enables radar imaging to obtain more target detail information, and can achieve more accurate target recognition and classification, while the high range resolution feature reduces the clutter power in each range resolution unit, which contributes to the improvement of radar detection performance. Favorable conditions are provided. However, in the case of wideband and high resolution, the size ...

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Problems solved by technology

[0006] In the above-mentioned detection algorithms, although pulse-to-pulse accumulation can obtain relatively ideal detection performance, under high-resolution conditions, when the relative motion speed of the target is very large, it will cause the target range image envelope of adjacent pulse periods If large movements occur, then they must be compensated when accumulating, which is not easy to realize in engineering

In these single-pulse detection methods, the binary accumulation detector has better detection performance, but it needs to rely on some prior knowledge of the target range image, especially the selection of its second threshold, otherwise it will lead to detection The situation of not reaching the target occurs; the energy accumulation detector is easy to implement and does not need to use the prior knowledge of the target range image. It is a very popular detection method in the early stage of research, but it has different performance losses in many cases , especially when the target energy only exists in a few range cells; the detector OS-RSTD based on the order statistics improves the detection performance of the energy accumulation detector when the target energy is concentrated, but it is applied to Evenly distributed targets will increase the noise component introduced due to the increase in the number of sequential detections, which is not conducive to the realization of detection

At the same time, these detection methods are all carried out after envelope detection or square rate detection of the one-dimensional image of the target, ignoring the echo phase information of each scattering point of the target, so a certain performance loss will occur

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