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PD radar system based Keystone transform space domain and time domain migration compensation method

A compensation method and airspace technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve problems such as large amount of calculation, and achieve the benefits of improving signal-to-noise ratio and coherent accumulation. , Improve the effect of space-time coherent accumulation

Inactive Publication Date: 2016-12-21
CNGC INST NO 206 OF CHINA ARMS IND GRP
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Problems solved by technology

[0008] In order to solve the shortcomings of the large amount of calculations in the traditional multi-channel time delay compensation method based on the transverse filter, the present invention proposes a Keystone transformation based on the PD radar system and the spatial and time domain motion compensation method, which is used to compensate the wideband phased array of the PD system The problem of distance walking in airspace and time domain in wide-angle radar scanning and long dwell time

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  • PD radar system based Keystone transform space domain and time domain migration compensation method
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  • PD radar system based Keystone transform space domain and time domain migration compensation method

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[0025] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0026] First, the range-dimensional Fourier transform is performed on the distance-array plane obtained by a single PRT sampling, and the distance-array plane is transformed into a fast Fourier-array plane, and then the array element is performed on each fast Fourier channel The interpolation between them realizes the Keystone transformation of the air domain; secondly, DBF is performed to form the directional beam of the desired signal, and the weight is the ideal weight at the carrier frequency; finally, the fast Fourier- The slow time plane performs interpolation in the slow time dimension, pulse compression in the frequency domain, and realizes distance walking compensation in the time domain.

[0027] Here, it is agreed that the input signal of the algorithm is the digital baseband signal after the AD sampling and DDC of the array element channel. The main l...

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Abstract

The present invention relates to a Keystone transform airspace and time domain walking compensation method based on the PD radar system. Firstly, the distance-array element plane obtained by a single PRT sampling is subjected to distance-dimensional Fourier transform, and the distance-array element plane is transformed into fast Fourier. leaf-array element plane, and then perform interpolation between the array elements on each fast Fourier channel to realize the Keystone transformation of the space domain; secondly, perform DBF, that is, form the directional beam of the desired signal, and the weight is Ideal weight; finally, the fast Fourier-slow time plane in the dwell time of the beam is interpolated in the slow time dimension, and the frequency domain pulse is compressed to realize the distance walking compensation in the time domain.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a space-time cascaded Keystone transformation algorithm for wideband digital phased array radar, which can compensate the aperture transition problem and long-term The problem of over-distance unit movement in the time-keeping target is suitable for wide-angle simultaneous multi-beam engineering. Background technique [0002] The time difference between the arrival of the radar target echo wavefront at both ends of the phased array antenna array is called the aperture transit time, and the corresponding distance is the aperture transit distance. The larger the deviation angle between the target and the antenna normal, the aperture transit time / aperture transit distance longer. If the radar uses broadband signals, the aperture spanning distance will be greater than multiple distance resolution units. At this time, if the phased array radar adopts the traditional...

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Application Information

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IPC IPC(8): G01S13/02G01S13/50G01S7/285
CPCG01S13/0209G01S7/285G01S13/50G01S2013/0245
Inventor 罗丁利王勇王亚军杨磊蔡兴雨
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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