Target Detection Method Based on Matching Fuzzy Function with Range Extension
A technology of distance expansion target and ambiguity function, which is applied in the direction of radio wave measurement system and instrument, and can solve the problem of no high-speed rotation
Active Publication Date: 2017-11-03
XIDIAN UNIV
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Therefore, this situation is only suitable for low-speed, and no high-speed rotating target
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[0043] The present invention will be further described below in conjunction with accompanying drawing:
[0044] refer to figure 1 , is the flow chart of the distance extended target detection method based on the matching fuzzy function of the present invention, and the distance extended target detection method based on the matched fuzzy function comprises the following steps:
[0045] Step 1, use the radar to transmit the signal, use the radar to receive the received echo signal, and then mix the echo signal and the reference signal to obtain the mixed signal r, and estimate the noise standard deviation of the mixer signal r
[0046] Its specific sub-steps are:
[0047]Using broadband radar to transmit signal (wideband chirp signal), wideband radar receiver receives echo signal (echo of broadband chirp signal reflected by target), and then performs deskewing processing on echo signal, so as to realize down-conversion of signal , the deskewing process is: mixing the echo si...
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The invention belongs to the technical field of radar target detection and particularly relates to a distance extension target detection method on the basis of matched fuzzy function. The distance extension target detection method includes steps of mixing echo signals and reference signals to obtain mixed signals, and estimating noise standard deviations of signals of a mixer; acquiring standardized signals of the mixed signals; subjecting the standardized signals of the mixed signals to discrete Fourier transform to obtain frequency domain signals after the discrete Fourier transform; dividing the frequency domain signals after the discrete Fourier transform into N / L sub-frequency domain signals by a function of a rectangular window; taking module values of various frequency values within each sub-frequency domain signals and summing the module values to obtain sequence imax of the N / L sub-frequency domain signals with the largest sum of the module values of the frequency values in the sub-frequency domain signals, and structuring matching signals; acquiring mutual fuzzy functions of the matching signals and the mixed signals to obtain regional integral characteristic values P; setting detection threshold eta, if the P is larger than or equal to the eta, indicating that targets exist, and if the P is smaller than the eta, indicating that the targets do not exist.
Description
technical field [0001] The invention belongs to the technical field of radar target detection, in particular to a distance-extended target detection method based on a matching fuzzy function. Background technique [0002] The echo signal of a target is related to two radar constants: the wavelength of the transmitted signal and the range resolution. If the size of the target along the radar line of sight is larger than the wavelength of the radar emission wave, then the target can be regarded as a combination of a series of scattered physical reflection centers, and the echo signal can be regarded as the superposition of echoes reflected by multiple individual scattering centers . [0003] In recent years, high-resolution radar has made great progress and has been widely used in imaging. In high-resolution radar systems, the range resolution is smaller than the size of the target in the radar line-of-sight direction. Therefore, the scattering centers are distributed in di...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 李明曹润清左磊吴艳薄涛
Owner XIDIAN UNIV