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Multi-band fusion algorithm based on improved relaxation algorithm

A relaxation algorithm and sub-band technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measurement devices, etc., can solve the problem of low fusion accuracy

Active Publication Date: 2021-04-02
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology

[0005] In view of the above problems, the present invention provides a multi-band fusion algorithm based on an improved relaxation algorithm to solve the problem of low fusion accuracy of the existing multi-subband radar fusion technology under high clutter conditions

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Embodiment 1

[0151] The following provides a detailed description of an embodiment of the present disclosure.

[0152] In the embodiment of the present disclosure, the maximum bandwidth to be fitted is 1.2GHz to 1.8GHz, the frequency interval is 20MHz, the number of frequency sampling points is 31, and the frequency distribution of the two subbands is as follows image 3As shown, in order to avoid too few sub-band sampling points, the sub-band signals need to be interpolated before fusion. The azimuth observation angle is -10°~10°, the sampling interval is 10°, and the number of sampling points is 21. refer to Figure 5 , the detection target is a cone, and the detection signal is irradiated from the bottom of the cone. Use COMSOL simulation software to simulate target radar echo, and add clutter to the echo, the signal-to-clutter ratio is -4.34dB. In order to quantitatively analyze the super-resolution ability of the MRA algorithm, two scattering centers are artificially added to the e...

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Abstract

The invention provides a multi-band fusion algorithm based on an improved relaxation algorithm. The algorithm comprises the steps of receiving a plurality of sub-band signals, selecting one sub-band signal from the plurality of sub-band signals as a reference signal, and compensating incoherent terms between the rest sub-band signals and the reference signal based on the improved relaxation algorithm, and estimating geometric diffraction model parameters of the large-bandwidth signal by using an improved relaxation algorithm on the basis of each sub-band signal subjected to incoherent term compensation, and substituting the geometric diffraction model parameters into a geometric diffraction model to reconstruct the large-bandwidth signal. According to the algorithm provided by the invention, in coherent processing, geometric diffraction model parameters of each sub-band are estimated based on an improved relaxation algorithm, and incoherent items are calculated and compensated by usingthe estimated parameters, so that the incoherent items can be accurately estimated under a strong clutter condition; because the algorithm can accurately estimate the frequency sampling point corresponding to the target position, the imaging resolution is high; a missing frequency band signal can be estimated so as to estimate a large-bandwidth radar signal, and the estimation precision is high.

Description

technical field [0001] The present disclosure relates to the technical field of radar imaging, in particular to a multi-band fusion algorithm based on an improved relaxation algorithm. Background technique [0002] Microwave radar observes the target by emitting electromagnetic waves to the target and processing the reflected electromagnetic waves of the target, and has the ability to work all day and all day. Compared with optical detectors, microwave radar can detect, track and identify targets in harsh environments, and plays an indispensable role in land surveying and mapping, flood monitoring, sea ice monitoring, soil moisture survey, forest resource inventory, geological survey and other fields. important role. [0003] In order to obtain finer information of the target, it is necessary to improve the range and azimuth resolution of the microwave radar. The range resolution can be improved by transmitting a large bandwidth chirp signal, and the azimuth resolution can...

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Application Information

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IPC IPC(8): G01S13/87G01S13/89G01S7/41
CPCG01S13/87G01S13/89G01S7/414Y02D30/70
Inventor 李王哲蒋文
Owner AEROSPACE INFORMATION RES INST CAS
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