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Radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling

A non-uniform sampling and high maneuvering target technology, applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of poor estimation accuracy of motion parameters, limited cumulative gain, and difficult engineering applications, so as to reduce the influence of cross items and parameter estimation High precision, achieve the effect of rapid order reduction

Active Publication Date: 2019-04-05
NAVAL AVIATION UNIV +1
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Problems solved by technology

[0003] 1) The segmented or step-by-step accumulation method has limited accumulation gain and cannot cope with strong clutter backgrounds and complex motion forms of maneuvering targets. The effect of subsequent Doppler walking compensation is affected by the result of distance walking compensation, which is likely to cause target Doppler energy Diffusion, motion parameter estimation accuracy is poor
[0004] 2) The long-term coherent accumulation method based on parameter search requires multi-dimensional parameter search, but for the high-order polynomial phase signal of high-maneuvering targets, its motion parameter dimension is very high, resulting in a large amount of multi-dimensional parameter search calculations, which is difficult to be suitable for engineering applications
[0005] 3) The maneuvering target accumulation detection method based on order reduction mostly adopts correlation successive order reduction, each time order reduction will generate cross terms, thus affecting the accumulation effect and parameter estimation accuracy

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  • Radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling
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  • Radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings. With reference to the accompanying drawings of the description, the processing flow of the present invention is divided into the following steps:

[0024] 1) Radar echo pulse compression to obtain fast time-slow time two-dimensional data

[0025] Assuming that the radar transmits a chirp signal, the received baseband echo signal is expressed as

[0026]

[0027] In the formula, t is fast time, representing the distance information, t m is the slow time between pulses, s r (t,t m ) is the baseband echo signal, A r is the echo amplitude, K is the FM slope of the transmitted chirp signal, T p is the pulse length, R s (t m ) is the radial distance between the radar and the target, c 0 Represents the speed of light, 2R s (t m ) / c is the echo delay, λ is the signal wavelength, the range pulse compression is performed on formula (1), and the radar echo tw...

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Abstract

The invention relates to a radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling, and belongs to the technical field of radar signal processing and detecting. The radar high maneuvering target phase-coherent accumulation detection method comprises the steps that first, radar echo pulse pressure is performed, time reversal is matchedwith Fourier transform, and slow time second-order phase compensation is performed; fast time dimension Fourier transform is performed to obtain distance frequency-slow time data, and frequency second-order phase compensation is performed; then, non-uniform sampling order reduction and variable scale scaling change are performed; inverse Fourier transform and the Fourier transform are performed inthe distance frequency and time dimension separately to realize long-term phase-coherent accumulation; and finally, the detection statistics are constructed to detect and estimate a maneuvering target. The radar high maneuvering target phase-coherent accumulation detection method can effectively accumulate maneuvering target signals with a high-order phase, compensate the distance and Doppler migration and improve the detection capability of the radar maneuvering target; meanwhile, the influence of a cross term of a traditional successive order reduction method is reduced, and the parameter estimation accuracy is improved; and no multi-dimensional motion parameter search matching calculation is needed, the amount of calculation is reduced, and the radar high maneuvering target phase-coherent accumulation detection method is suitable for engineering application.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a radar high maneuvering target coherent accumulation detection method based on time-reversal non-uniform sampling, which can be used for rapid radar detection and estimation of maneuvering targets. Background technique [0002] The detection and parameter estimation of maneuvering targets are always the key technologies and difficulties in radar signal processing. Since the echoes of maneuvering targets can be represented by polynomial phase signals, the stronger the maneuverability, the higher the polynomial order, and the high precision of its detection and parameters It is estimated to be more difficult. In addition, radar maneuvering target detection usually adopts coherent accumulation. Long-term coherent accumulation is an effective way to achieve high accumulation gain, but there are two problems in long-term accumu...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41G01S7/415
Inventor 陈小龙陈唯实关键赵志坚黄勇何友
Owner NAVAL AVIATION UNIV
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