A broadband multiband imaging coherent processing method
A processing method, multi-band technology, applied in the direction of reflection/re-radiation of radio waves, radio wave measurement systems, utilization of re-radiation, etc.
Inactive Publication Date: 2014-03-26
中国航天科工集团第二研究院二〇七所
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[0003] The purpose of the present invention is to aim at the coherent processing problem in the fusion of broadband multi-band radar signal layer, propose a kind of coherent processing method of broadband multi-band imaging based on frequency extrapolation and scattering center extraction, to overcome existing technology The above deficiencies
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] The principle that the present invention is based on is as follows:
[0040] Whether it is a chirp signal or a frequency step signal, for two radar observations on the same frequency, the phase difference of the same scattering center is:
[0041]
[0042] Among them, α is the linear phase error, β is the fixed phase error, f n is the number of frequency points;
[0043] When the radars are adjacently configured, the amplitudes of the target scattering responses are approximately the same. Considering the modulation effect of the two radar receiving systems on the amplitude of the scattering center, it can generally be considered that the amplitude of the scattering center of the two radars is A 1i and A 2i The difference is only a constant multiplication factor k caused by the difference in system gain, which is the magnitude er...
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The invention belongs to technical field of target characteristic and target identification and specifically relates to a broadband multiband imaging coherent processing method. The method comprises following steps of: performing modeling extrapolation processing on data in two different frequency bands of a same target measured respectively by two radars in order to obtain frequency response data with consistent frequency ranges; performing imaging processing on extrapolated broadband data in order to extract positional information of two groups of scattering centers of range profiles; respectively calculating positional difference of corresponding scattering centers and finally obtaining an average positional difference in order to further obtain linear phase error estimation; calculating the amplitude errors of the two groups of scattering centers in sequence in order to obtain amplitude error estimation; performing linear phase error compensation and amplitude error compensation on extrapolated data out of a certain frequency band and extracting the positional information, the amplitude information, and the phase information of compensated scattering centers; and calculating the phase difference of the two groups of scattering center in sequence in order to obtain a fixed phase error. The method is little in computational complexity and high in estimative accuracy.
Description
technical field [0001] The invention belongs to the technical field of target characteristics and target recognition, and in particular relates to a coherent processing method of broadband multi-band imaging. Background technique [0002] Data fusion of broadband radars in different bands can obtain data with a larger bandwidth, thereby obtaining better range resolution. Prior to data fusion processing, coherent processing of different band data is the key to this technology. In broadband multi-band radar imaging technology, coherent processing is the premise and key of signal fusion. Judging from the current public literature, coherent processing is generally to establish a nonlinear objective function, and then use maximum likelihood estimation, nonlinear least squares or various nonlinear optimization algorithms to estimate the amplitude and phase compensation parameters. It is necessary to define the coherence function, and then perform multi-dimensional optimization t...
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Login to View More IPC IPC(8): G01S7/41
CPCG01S7/2923G01S13/0209G01S13/90
Inventor 黄璟宁超肖志河
Owner 中国航天科工集团第二研究院二〇七所