Maneuvering target coherent detection method and system based on distance frequency axis inversion transformation and second-order WVD

Abstract

The invention belongs to the field of maneuvering target detection, and particularly relates to a maneuvering target coherent detection method and system based on distance frequency axis inversion transformation and second-order WVD, and the method comprises the steps: carrying out the pulse compression of a radar echo signal, carrying out the frequency inversion of the signal after pulse compression along a distance frequency dimension, and gathering target echoes into a same distance unit; performing time-frequency transformation on the echo signal in the distance unit by using the second-order WVD, and estimating the target acceleration through Fourier transform processing; a phase compensation function is utilized to construct a compensated distance frequency-slow time domain dimension signal which is the same as a constant-speed motion model, variable delay self-correlation is carried out along a slow time dimension, and after addition operation and scale Fourier transform decoupling, Fourier transform is carried out on a slow time variable to realize coherent accumulation, so that a constant-speed motion model is obtained. And the actual speed and the initial distance of the maneuvering target are estimated. According to the method, the calculation complexity is reduced, the parameter estimation performance and effect can be ensured, and the method is convenient for actual scene application.

Description

technical field [0001] The invention belongs to the field of mobile target detection, in particular to a method and system for coherent detection of a mobile target based on range-frequency axis inversion transformation and second-order WVD. Background technique [0002] With the development of science and technology, air targets such as new stealth aircraft and small UAVs bring technical challenges to the detection ability of traditional radar due to their special design and small size. The estimation of the motion parameters of such targets is also proposed. higher requirement. According to the basic theory of radar, the signal-to-noise ratio (SNR) of the received signal can be improved by increasing the transmit power, increasing the antenna aperture, and reducing the receiver noise figure on the hardware. However, this hardware change increases the cost of equipment development and use, and also increases the risk of radar exposure and destruction. In contrast, the use...

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Problems solved by technology

[0004] To this end, the present invention provides a method and system for coherent detection of maneuvering targets based on range-frequency axis inversion transformation and second-order WVD, to solve the problem of range migration and Doppler migration of moving targets in the air during long-term coherent accumulation. And other problems, while reducing the computational complexity, it can ensure the performance and effect of parameter estimation, which is convenient for practical application

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