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Multi-Channel SAR Azimuth Defuzzification Method Based on Fuzzy Component Doa Estimation

A component and fuzzy technology, applied in the field of airborne multi-channel SAR wide-scene mapping, can solve the problems of estimated signal cancellation, target steering vector mismatch, etc.

Inactive Publication Date: 2017-06-30
HOHAI UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an estimation of fuzzy component space angle and a multi-channel SAR azimuth defuzzification method, which solves the problem of ADBF space domain covariance matrix estimation signal cancellation and target guidance under the system error when the traditional method solves azimuth ambiguity. vector mismatch problem

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  • Multi-Channel SAR Azimuth Defuzzification Method Based on Fuzzy Component Doa Estimation
  • Multi-Channel SAR Azimuth Defuzzification Method Based on Fuzzy Component Doa Estimation
  • Multi-Channel SAR Azimuth Defuzzification Method Based on Fuzzy Component Doa Estimation

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[0080] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0081] Airborne radar geometry such as figure 1 As shown, the carrier aircraft flies along the X-axis at the speed V, and the flight height of the carrier aircraft is H. M uniform linear arrays are distributed along the straight line of the course, and the leftmost array element along the navigation direction is stipulated as the transceiver array element ( figure 1 The middle is array element 1), and the rest are receiving array elements. Assuming that the aircraft is above the coordinate origin at t=0, at a certain time t, the position of the aircraft is x=V*t, then the slant distance from the target to the mth array element is:

[0082]

[0083] in H represents the height of the aircraft, and d represents the distance between array elements.

[0084] After simplification, the echo model of each channel is:

[0085]

[0086] where K r Refe...

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Abstract

The invention discloses a method for estimating a fussy component space angle and ambiguity-resolving multi-channel SAR (segmentation and resassembly sublayer) orientation, which solves a problem that ADBF (adaptive digital beam forming) airspace covariance matrix estimation signals under system errors are balanced out and target guide vectors are mismatched when a conventional method solves azimuth ambiguity. The method comprises the following steps: firstly, constructing a multichannel SAR echo signal mode; then, performing fast Fourier transform (FFT) on an echo signal tracing distance unit subjected to distance dimensional pulse compression; then, utilizing NSIT to accurately estimate a space angle of each doppler ambiguity component in real time, assisting designing a space filter based on spatial information of each ambiguity component, and extracting each doppler ambiguity component; splicing to obtain a complete non-ambiguity signal to achieve an azimuth ambiguity dissolving purpose. The method effectively solves a problem that the signals are balanced out as each secondary ambiguity component exists in a sample of ADBF covariance matrix estimation; moreover, the inhibition to the ambiguity component is greatly improved.

Description

technical field [0001] The invention belongs to the field of airborne multi-channel SAR wide-scene surveying and mapping, and in particular relates to a method for estimating space angles of fuzzy components and a multi-channel SAR azimuth defuzzification method. Background technique [0002] In airborne synthetic aperture radar imaging, in order to solve the contradiction between wide surveying swath and azimuth high resolution, scholars at home and abroad have mainly done a lot of research work from two aspects, one is SAR defuzzification processing technology, the other is It is to develop a more flexible new SAR system; usually a lower pulse repetition frequency (PRF) is usually used in a SAR system to ensure coverage in a wider range, but the azimuth signal is ambiguous, so deblurring is necessary for SAR imaging. In addition, the main feature of the new SAR system is the combination of multiple transmit / receive channels and appropriate digital signal processing techniq...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S13/90
CPCG01S3/14G01S13/9011
Inventor 沈明威杨柳于佳胡佩
Owner HOHAI UNIV
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