A Coherent Accumulation Detection Method for Uniformly Accelerating Moving Targets
A technology of coherent accumulation and moving targets, which is applied in the field of coherent accumulation detection of uniformly accelerating moving targets, can solve problems such as large amount of calculation, reduced practicality, and complex calculation, so as to suppress noise, improve detection ability, and reduce calculation volume effect
Active Publication Date: 2020-12-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, the calculation of the generalized Radon Fourier transform is very complicated, which affects the real-time performance of radar signal processing
Generally speaking, the existing methods are mainly realized by interpolation operation or multi-dimensional parameter search, which reduces the practicability due to the larger amount of computation and more complex implementation methods.
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[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.
[0025] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are to verify its correctness with scientific computing software Matlab R2014a. Set the number of targets to 1, the initial distance of the target relative to the radar is 300km, the target radial velocity is 2500m / s, and the target radial acceleration is 24m / s 2 , the radar launch carrier frequency is 0.3GHz, the radar bandwidth is 5MHz, the radar pulse repetition frequency is 500Hz, the total number of pulses in the coherent accumulation time is 512, and the signal-to-noise ratio is -10dB. Combine below figure 1 Provide the specific implementation of the present invention:
[0026] Step 1: Use the PD radar to trans...
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The invention discloses a coherent accumulation detection method for uniformly accelerating moving targets, which belongs to the technical field of radar. The invention first uses the PD radar to transmit a linear frequency modulation signal, and then performs pulse compression on the received echo signal containing the target. Then the coordinate transfer transformation is performed on the echo signal after pulse compression to correct the distance walking of the target. Then, the fractional Fourier transform is used to eliminate the Doppler walk of the target and realize the coherent accumulation of energy. Since the present invention uses the amplitude and phase information in the target echo to carry out long-term coherent accumulation, it can effectively suppress noise and improve the detection performance of the radar for weak targets. In addition, the fractional Fourier transform of the present invention can be realized by fast Fourier transform, so the amount of calculation can be greatly reduced, which is beneficial to the rapid detection of weak targets by radar.
Description
technical field [0001] The invention belongs to the moving target detection technology in the field of radar technology, and in particular relates to a coherent accumulation detection method for uniformly accelerating moving targets. Background technique [0002] In recent years, with the development and progress of science and technology, how to quickly and effectively detect moving targets with low signal-to-noise ratio has become a challenging problem in the field of radar signal processing. Because long-distance targets and low radar cross-section targets usually have very low echo signal-to-noise ratios, we often call these two types of targets weak targets. In order to effectively detect weak targets, increasing the number of echo accumulation and prolonging the accumulation time is an effective method. However, as the accumulation time prolongs, the target will inevitably exhibit range walk and Doppler walk. Therefore, the compensation effect of distance walking and...
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IPC IPC(8): G01S7/292G01S7/41G01S13/50
Inventor 易伟孙智付月熊丁丁陈璐李小龙崔国龙孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA