Polarizing radar target detection method based on uniform phase diversity system

Abstract

The present invention provides a polarizing radar target detection method based on a uniform phase diversity system. The method comprises: a radar employs orthogonal dual-polarization array receiving antenna and a uniform phase diversity emission polarization diversity system, and polarization-space joint spectrums are generated for receiving signals in each pulse repetition period; the polarization-space joint spectrums are overlapped to form a synthetic spectrum; after the modular operation of the synthetic spectrum, a four-dimensional unit average constant false alarm detection and trace point merging method is employed to obtain suspected object points; the synthetic spectrum perform orientation-pitching grid division in the orientation-pitching space, the polarized state distance standard deviation characteristic quantity of all the suspected object points in each orientation-pitching grid is calculated and is compared to a detection threshold, and it is determined whether suspected objects are radar targets or not. The polarizing radar target detection method based on the uniform phase diversity system can substantially improve the radar target detection capability of a main lobe having a plurality of adjacent interferences or in the condition that the main lobe has variable polarization interference.

Description

technical field [0001] The invention belongs to the technical field of polarized radar detection, and mainly relates to the problem of polarized radar target detection under the condition that multiple radio frequency interferences exist in the main lobe of a radar antenna or radio frequency interferences with variable polarization exist in the main lobe. Background technique [0002] Polarization radars generally refer to radars with dual-polarization or multi-polarization antennas that can quickly change the polarization state of transmission and reception. Since polarized radar can improve the signal-to-interference-noise ratio (the power ratio of signal to interference and noise) by matching its receiving polarization to the radar target echo polarization or orthogonal to the interference signal polarization, therefore, the polarimetric radar It has better object detection ability. [0003] The target detection performance advantage of polarimetric radar is particularly...

AI Technical Summary

Problems solved by technology

However, its detection performance degrades rapidly when there are multiple interferences in the main lobe

[0004] With the increasing complexity of the civilian radio frequency environment and the continuous extension of the radar operating frequency band, radars are increasingly threatened by civil radio frequency interference in the same frequency band. Among them, the radio frequency interference close to the radar target direction will form multiple poles in the main lobe of the radar antenna. The interference with different polarization and weak correlation makes the polarization degree of the synthesized interference signal decrease rapidly, resulting in a serious decline in the ability of polarization radar interference suppression and target detection

Especially when there are multiple spatially adjacent interferences in the main lobe or interferences with randomly changing polarization states in the main lobe (called variable polarization interference), it is difficult for existing methods to effectively detect targets

[0005] The problem of radar target detection under the background of multiple spatially adjacent interferences or variable polarization interferences in the main lobe is a difficult problem currently faced by the radar industry, and no related technologies have been reported in public literature

Images