Method for detecting radar weak moving target based on PD (Phase Differentiation) RLVD (Radon-Lv Distribution)

A moving target detection and phase difference technology, used in radio wave measurement systems, instruments, etc., can solve the problems of high signal-to-noise ratio requirements of input signals and difficult to meet the needs of radar detection performance, and achieve the effect of avoiding speed ambiguity

Active Publication Date: 2013-11-20
NAVAL AERONAUTICAL UNIV
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Problems solved by technology

Commonly used high-order phase matching methods mainly include polynomial Fourier transform (Polynomial Fourier Transform, PFT) and high-order a

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  • Method for detecting radar weak moving target based on PD (Phase Differentiation) RLVD (Radon-Lv Distribution)
  • Method for detecting radar weak moving target based on PD (Phase Differentiation) RLVD (Radon-Lv Distribution)
  • Method for detecting radar weak moving target based on PD (Phase Differentiation) RLVD (Radon-Lv Distribution)

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Embodiment Construction

[0028] In order to explain the range migration and Doppler migration effect of the moving target involved in the present invention, a complex moving target radar echo modulation model is firstly given.

[0029] The radar echoes of complex moving targets include frequency-modulated signals produced by non-uniform translation and rotation. According to the Weierstrass approximation principle, the echo signal of a moving target can be approximated by a polynomial phase signal of sufficient order. The acceleration caused by the speed change of the target causes the echo to appear in the secondary phase, and the thrust of the engine during the maneuvering process of the target corresponds to the change in acceleration (jerk), so that the echo appears in the third phase (Cubic Phase, CP), frequency Non-linearly changing with time. Therefore, the CP signal can be used as a high-order approximation of the echo signal of a non-uniform translational target. Rotating targets, such as s...

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Abstract

The invention relates to a method for detecting a radar weak moving target based on PD (Phase Differentiation) RLVD (Radon-Lv Distribution), and belongs to the technical field of radar signal processing and detecting. The method comprises the following steps: first, performing PD operation on a demodulated and pulsed radar echo, and reducing the order of a cubic phase signal related to slow time to obtain a secondary phase signal; then, performing RLVD operation to finish long-time phase-coherent accumulation, including Radon-instantaneous auto-correlation operation, scaling treatment and Radon-Fourier transform; finally, establishing a PD-RLVD domain detection unit figure, performing constant false-alarm detection and estimating a target movement parameter. By the method, a target observation value is extracted from a distance-slow time plane to compensate distance migration to finish the long-time phase-coherent accumulation; an additional parameter is not required to be set to match a moving target signal, high-order phase signal energy can be accumulated, and a peak value corresponds to modulation frequency and secondary modulation frequency; therefore, the method is suitable for detecting a uniformly accelerated or high-order complex moving target under a strong clutter background.

Description

1. Technical field [0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a radar weak moving target detection method based on phase difference Radon-Lv distribution, which can be used for radar detection processing of complex moving targets under strong clutter background. 2. Background technology [0002] In recent years, stealth targets (such as stealth aircraft, stealth ships, etc.) and high-speed maneuvering targets have made it difficult for traditional radars to effectively detect and track them continuously and stably. On the one hand, the smaller radar cross section (Radar Cross Section, RCS) reduces the energy of the target echo, resulting in a greatly reduced target detection performance of the early warning radar, and a greatly shortened early warning distance; on the other hand, high-speed maneuvering has become a target emergency One of the key means of defense, especially the ac...

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Application Information

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IPC IPC(8): G01S7/41
Inventor 陈小龙蔡复青关键周伟丛瑜姚力波王国庆何友
Owner NAVAL AERONAUTICAL UNIV
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