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High speed moving target detection using noise modulated continuous wave radar based on keystone transform


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High speed moving target detection using noise modulated continuous wave radar based on keystone transform
Lv JingGu HongSu WeiminBo chao
School of Electronic Engineering and Optoelectronic Technology,NUST,Nanjing 210094,China
keystone transform noise frequency modulated continuous wave radar high speed moving targets Doppler dispersion effect overlapping equal interval piecewise method range migration
In order to solve the problem of Doppler dispersion effect caused by high speed motion of targets,a range migration compensation method is proposed based on keystone transform.According to the feature of aperiodicity of noise frequency modulated continuous wave,frequency domain correlation based on the equal interval piecewise method of overlapping is adopted to echo signals.Combined with fast discrete time scale transformation,effective long time coherent integration is achieved.Multiple targets can be detected simultaneously without prior knowledge.The method proposed here is compared with the traditional time domain correlation method and analyzed,and its effectiveness is verified by simulation experiments.Without range migration of targets,the promotion of output signal-to-noise ratio of the time domain correlation method and the method proposed here is equal basically.With range migration of targets,the output signal-to-noise ratio of the time domain correlation method decreases rapidly,and its deterioration is proportional to migration severity,but the output signal-to-noise ratio of the method proposed here after range migration compensation is not affected by the speed of targets and increases with the increase of accumulating time.


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Last Update: 2014-12-31