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SRDF (Space-Range-Doppler Focus) moving object accumulation detection method for frequency diverse array radar

A frequency-controlled array radar and detection method technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as energy divergence, improve the ability to resist noise and clutter, improve signal-to-noise ratio or signal-to-noise ratio, parameter The effect of high estimation accuracy

Active Publication Date: 2018-10-23
NAVAL AERONAUTICAL UNIV
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Problems solved by technology

However, most of the research on frequency control array radar signal processing and target detection focuses on stationary targets. For moving targets, their Doppler has time-varying characteristics, which makes the energy diverge. How to make full use of the space, time and frequency resources of frequency control array radar , realize space (azimuth)-distance (fast time)-frequency (slow time) focusing processing, and improve the detection and estimation performance of radar moving targets in complex environments, which urgently need further research

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  • SRDF (Space-Range-Doppler Focus) moving object accumulation detection method for frequency diverse array radar
  • SRDF (Space-Range-Doppler Focus) moving object accumulation detection method for frequency diverse array radar
  • SRDF (Space-Range-Doppler Focus) moving object accumulation detection method for frequency diverse array radar

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings. Refer to attached figure 1 , the processing flow of the present invention is divided into the following steps:

[0021] (1) Demodulate and match filter the signal at the receiving end, and construct the distance-orientation two-dimensional vector of the receiving array element signal

[0022] Consider a uniform line array with M transmitting array elements, the array element spacing is d, according to the attached figure 2 The schematic diagram of the transmitting array of the frequency control array radar is shown, and the signal transmitted by the mth array element is

[0023]

[0024] Among them, f m = f 0 +Δf m , Δf m =(m-1)Δf,f 0 is the carrier frequency, Δf is the frequency increment much smaller than the radar operating carrier frequency, for distance and azimuth (r s ,θ s ), then at the receiving end, the signal transmitted by the mth array...

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Abstract

The invention relates to an SRDF (Space-Range-Doppler Focus) moving object accumulation detection method for a frequency diverse array radar, and belongs to the technical field of radar signal processing and detection. The method comprises the steps: carrying out the echo demodulation and matched filtering of the frequency diverse array radar, constructing a distance-azimuth two-dimensional vectorof a receiving array element signal; realizing distance / azimuth joint estimation based on a spatial spectrum estimation algorithm; implementing the high-resolution sparse domain Doppler extraction based on sparse fractional Fourier transform to complete the space-frequency focusing processing of a moving object; constructing a space-range frequency domain detection unit map, and detecting the moving object. The method fully utilizes the flexible freedom degree and energy aggregation of the frequency diverse array radar in space, distance and Doppler, achieves the coherent projection and SRDFin a multi-dimensional space, integrates the pulse compression, angle estimation and Doppler filtering of the conventional radar signal processing, is high in accumulation gain and parameter estimation accuracy, and can improve the radar moving target detection capability in complex environments.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a method for accumulating and detecting moving targets with space-range frequency focusing of frequency-controlled array radars, which can be used for detection and processing of radar weak moving targets in complex environments. Background technique [0002] Affected by the complex background environment (land, city, ocean, etc.) and the complex motion characteristics of the target, the radar echo of the target is extremely weak, has complex characteristics, and has low observability, making it difficult for the detection performance of the radar to meet the actual needs of moving targets. Low-observable moving target detection technology in complex background has become a key constraint factor affecting radar performance, and it is also a worldwide problem. Therefore, there is an urgent need to study new radar systems and...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411
Inventor 陈小龙陈宝欣黄勇关键薛永华于晓涵张林何友
Owner NAVAL AERONAUTICAL UNIV
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