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Multichannel reconstruction method and device for periodical non-uniform sampling SAR (synthetic aperture radar) signals

A non-uniform sampling, multi-channel technology, applied in the direction of measurement devices, radio wave reflection/re-radiation, special data processing applications, etc., can solve the problems of amplifying noise power and azimuth ambiguous signal power

Inactive Publication Date: 2014-08-27
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] However, multi-channel reconstruction amplifies noise power and azimuthally ambiguous signal power due to system noise and antenna sidelobes
Moreover, the more serious the non-uniform sampling is, the more the noise power and azimuth ambiguity power will be amplified, and the greater the impact on the performance of the radar system and the radar image will be

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  • Multichannel reconstruction method and device for periodical non-uniform sampling SAR (synthetic aperture radar) signals
  • Multichannel reconstruction method and device for periodical non-uniform sampling SAR (synthetic aperture radar) signals
  • Multichannel reconstruction method and device for periodical non-uniform sampling SAR (synthetic aperture radar) signals

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Embodiment Construction

[0070] In the embodiment of the present invention, the pulse repetition frequency of the radar transmitter is periodically changed to obtain the SAR echo signal with non-uniform sampling in the azimuth direction, and the constrained reconstruction filter is constructed according to the multi-channel characteristics of the SAR echo signal with non-uniform sampling in the azimuth direction. The underdetermined linear equations of the filter are used to obtain the reconstructed signal power, and the optimal reconstruction filter is obtained by combining the underdetermined linear equations and the minimum condition of the signal power, and the reconstruction filter is used to complete multi-channel reconstruction .

[0071] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0072] The flow chart of the multi-channel reconstruction method of periodic non-uniform sampling SAR signal provided by the...

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Abstract

The invention discloses a multichannel reconstruction method for periodical non-uniform sampling SAR (synthetic aperture radar) signals. The method includes: periodically changing pulse repetition frequency of a radar transmitter to acquire a periodical non-uniform sampling SAR echo signal, constructing a constraint underdetermined system of linear equations of a reconstruction filter according to channel features of the periodical non-uniform sampling SAR echo signal to acquire signal power after multichannel reconstruction, combining the underdetermined system of linear equations and minimum conditions of the signal power to acquire the optimal reconstruction filter, and using the optimal reconstruction filter to complete multichannel reconstruction.

Description

technical field [0001] The present invention relates to the recovery problem of periodic non-uniform Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) signals, in particular to a multi-channel reconstruction method and device for periodic non-uniform sampling SAR signals. Background technique [0002] With the development of the new system and new concept SAR, the periodic non-uniform sampling of the azimuth SAR signal has become a major problem in many new system SARs, and it is common in the separation phase center multi-beam SAR, multi-platform multi-base SAR and agile pulse repetition Frequency SAR. In order to restore the uniformly sampled signal, an effective method is to use a multi-channel reconstruction algorithm. [0003] However, due to the influence of system noise and antenna sidelobes, multi-channel reconstruction will amplify the noise power and azimuthally ambiguous signal power. Moreover, the more serious the non-uniform sampling is, the more the no...

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Application Information

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IPC IPC(8): G06F19/00G01S7/40G01S13/90
Inventor 罗绣莲邓云凯王宇徐伟郭磊
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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