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A method and device for suppressing range ambiguity of multi-channel synthetic aperture radar

A synthetic aperture radar and range direction technology, which is used in measurement devices, radio wave reflection/re-radiation, utilization of re-radiation, etc. Suppresses the effect of distance blur

Active Publication Date: 2016-06-08
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Since the multi-channel SAR uses pulse work, the multi-channel SAR transmits multiple pulse signals in the range direction, and different echo pulse signals will propagate to the receiver of the multi-channel SAR at the same time due to different slant range differences, which will cause ambiguous signals in the range direction the emergence of
For spaceborne multi-channel SAR, due to the large mapping bandwidth and high Pulse Recurrence Frequency (PRF, Pulse Recurrence Frequency), the range ambiguity has a great influence on the imaging performance of SAR. Urgent problems

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  • A method and device for suppressing range ambiguity of multi-channel synthetic aperture radar
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  • A method and device for suppressing range ambiguity of multi-channel synthetic aperture radar

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[0055] In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.

[0056] figure 1 It is a schematic flow chart of the multi-channel SAR range ambiguity suppression method of the embodiment of the present invention, such as figure 1 As shown, the method for suppressing the multi-channel SAR range ambiguity comprises the following steps:

[0057] Step 101: Perform phase modulation on the transmit signal and phase demodulation on the echo signal by using azimuth phase encoding, so as to separate the range ambiguity signal and the target signal in the azimuth Doppler domain.

[0058] Preferably, the phase modulation of the transmit signal an...

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Abstract

The invention discloses an inhibition method and device for the distance direction blur of a multichannel synthetic aperture radar (SAR). The inhibition method for the distance direction blur of the SAR comprises the steps of performing phase modulation on an emission signal and performing phase demodulation on an echo signal by using azimuth phase coding, so a distance blurred signal and the target signal are separated from each other in the azimuth Doppler domain; generating an azimuth DFB (distributed feed back) vector by using a multichannel collecting signal, and forming zero trap at the position where the distance direction blurred signal is positioned by using the DFB vector so as to filter out the distance direction blur in the target signal; imaging the target signal of which the distance direction blur is filtered out, thus obtaining the target SAR image with the inhibited distance direction blur.

Description

technical field [0001] The present invention relates to a multi-channel synthetic aperture radar (SAR, Synthetic Aperture Radar) ambiguity suppression technology, in particular to a multi-channel SAR range ambiguity suppression method and device. Background technique [0002] Traditional SAR has an inherent contradiction between improving the azimuth resolution and increasing the surveying and mapping bandwidth. This inherent contradiction is manifested in the fact that the SAR antenna is limited by the minimum area. To solve this inherent contradiction, the SAR system uses multiple small antennas to form the antenna of the system , this SAR system is called multi-channel SAR. [0003] The range ambiguity is an important indicator in spaceborne multi-channel SAR. The range ambiguity directly reflects the interference degree of the range sidelobe signal to the main lobe signal. When designing a multi-channel SAR system, the range ambiguity is the main one of the indicators. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S7/023G01S13/90G01S13/904
Inventor 郭磊王宇邓云凯罗秀莲王伟
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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