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Spaceborne SAR Digital Beamforming Method Based on Sparse Spatial Spectrum Estimation

A sparse space, digital beam technology, applied in the field of radar, can solve the problems of SAR image SNR loss, direction of arrival estimation performance degradation, etc., to ensure the effect of receiving gain

Inactive Publication Date: 2019-02-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

These methods all use the subspace direction finding method to improve the influence of terrain fluctuations, but the subspace direction finding method is affected by the number of samples
When the number of samples is small, the estimation performance of the direction of arrival will be greatly reduced, resulting in the loss of the SNR of the SAR image

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  • Spaceborne SAR Digital Beamforming Method Based on Sparse Spatial Spectrum Estimation

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Embodiment Construction

[0016] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0017] Step 1, performing distance compression on the echo signals received from the elevation to each sub-aperture.

[0018] Assuming that the SAR system is divided into M uniformly distributed sub-apertures along the elevation direction, as shown in the attached figure 2 shown, where H s is the height of the satellite platform, d m Indicates the distance from the mth sub-aperture to the first sub-aperture, α is the horizontal inclination angle of the antenna, r 1 and r m respectively represent the slant distances from the ground target P to the first and m sub-apertures, h is the altitude of the target P, θ is the angle between the line connecting the slant distances from the target to the first sub-aperture and the normal line of the antenna panel, and its value Upwards away from the antenna normal is positive, and downwards is negative, which can be calcul...

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Abstract

The invention discloses a spaceborne SAR digital beamforming method based on sparse space spectrum estimation, which mainly solves the problem of receiving gain loss caused by the influence of small sample constraints in the existing method. The implementation steps of the present invention are: (1) carry out distance compression on the echo signals received by each sub-aperture in elevation; (2) according to the sparse spatial spectrum estimation method, use the echo estimation of each range unit to obtain the target corresponding to each range moment The echo direction of the scene; (3) According to the estimated echo direction, calculate the weighted vector of the sub-aperture corresponding to each distance moment, so that the center of the formed receiving beam accurately points to the location of the target scene. The invention converts the target scene elevation estimation problem into a sparse space spectrum estimation problem, reduces the limitation that the existing method is easily affected by small sample constraints, realizes correct beam pointing under complex terrain, and ensures the receiving gain of echo signals.

Description

technical field [0001] The present invention belongs to the field of radar technology, and further relates to a spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) digital beamforming (Digital Beamforming, DBF) method in the field of radar imaging technology. Background technique [0002] Synthetic aperture radar has been widely used in military and civilian fields such as strategic defense and terrain surveying and mapping because of its all-day, all-weather, and long-range imaging capabilities. Among them, combined with Digital Beamforming (DBF), the use of elevation beam scanning (SCan-On-REceive, SCORE) technology to improve the system Signal to Noise Ratio (SNR) has become one of the research hotspots of modern radar. . [0003] SCORE technology sets multiple sub-apertures at the receiving end in the elevation direction, and performs time-varying weighting processing on them to form an equivalent high-gain narrow beam to track the received echo. Under ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/904
Inventor 杨桃丽淦小健王勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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