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 fr

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

[0021] (1) Demodulate and filter the signal at the receiving end to construct a two-dimensional vector of the distance-azimuth of the receiving array element signal

[0022] Consider a uniform linear array of M transmitting array elements, the distance between the array elements is d, according to the attached figure 2 As shown in the schematic diagram of the transmitting array of the frequency-controlled array radar, the signal transmitted by the m-th array element is

[0023]

[0024] Where 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 the distance and azimuth (r s ,θ s ), then at the receiving end, the signal transmitted by t...

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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...

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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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