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Phase-coherent accumulation detection method for high-speed high maneuvering target

A high maneuvering target, coherent accumulation technology, applied in the direction of measuring device, using re-radiation, radio wave measurement system, etc., can solve the problem that there is no method for estimating the motion parameters of high speed and high maneuvering target, and achieve the effect of improving the detection performance

Active Publication Date: 2014-10-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

At present, there is no motion parameter estimation method for high-speed and high-maneuvering targets moving with variable acceleration

Method used

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  • Phase-coherent accumulation detection method for high-speed high maneuvering target
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  • Phase-coherent accumulation detection method for high-speed high maneuvering target

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Embodiment Construction

[0029] Combine below figure 1 A specific implementation of the present invention is given.

[0030] The radar echo of the high-speed and high-mobility target is simulated by the scientific computing software matlab R2008a. The number of targets is 1, the initial distance of the target relative to the radar is 600km, the target radial velocity is 3600kms, and the target radial acceleration is 20ms 2 , the target radial acceleration change rate is 10ms 3 , the radar transmission carrier frequency is 10GHz, the distance resolution is 150 meters, the radar pulse repetition frequency is 200Hz, a coherent accumulation time contains 201 pulses, and the signal-to-noise ratio is -8dB.

[0031] The first step: echo signal pulse compression: for the pulse echo signal received by the radar receiver fast time Perform fast Fourier transform FFT for the variable to the distance frequency domain, and obtain the frequency domain data z(f,t) of the echo distance dimension m ), where f rep...

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Abstract

The invention aims at achieving the technical purpose of providing a phase-coherent accumulation detection method for a high-speed high maneuvering target. The method includes the steps that firstly, Keystone conversion is used for compensating for the distance moving of the target within a distance unit; secondly, the speed multiple of the target is obtained through traverse searching and is used for compensating for the distance moving of the target on distance units (the number of the distance units can be seen in the specifications), and therefore after the distance moving of the target is corrected, a target echo envelope peak value with the distance moving compensated for can be within one distance unit; thirdly, two-dimensional traverse searching is then used for estimating the radial acceleration and the acceleration rate of change of the target, Doppler moving of the target can be compensated for and eliminated, and the phase of echoes is in linear variation; finally, effective accumulation of energy of the target is achieved through the FFT.

Description

technical field [0001] The invention belongs to the field of radar signals and relates to a target detection method. Background technique [0002] With the development of science and technology, especially the continuous development of high-speed targets, more and more high-speed maneuvering targets appear in the field of radar signal detection. For example, hyperspeed vehicles in near space can fly at speeds up to Mach 25, and can move at variable accelerations with strong maneuverability. The waves are very weak, which reduces the detection performance of the radar. [0003] Long-term coherent accumulation utilizes the target's motion characteristics and Doppler information, which can effectively improve the target signal energy and radar detection performance. The key to long-term coherent accumulation lies in the effective superposition of target echo energy. However, the high speed and strong maneuverability of the target will cause the peak value of the target echo ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/53G01S7/41
CPCG01S7/40G01S7/415G01S13/53
Inventor 崔国龙李小龙姜海超汪兵易伟孔令讲杨益川董天发
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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