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SAR radar imaging method and system

A radar imaging and imaging technology, which is applied in the direction of radio wave measurement systems, instruments, and measuring devices, can solve the problems of being unable to simultaneously detect different scenes in the far, middle, and near, complex signal compensation algorithms, and many imaging constraints, and achieve imaging effects. Better, lower hardware cost, less computation

Active Publication Date: 2022-01-11
SUZHOU WEIMO ELECTRONIC INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing SAR radar requires different relative motion speeds between the target and the detection platform during the detection process, and its imaging algorithm is extremely complex. When using focused SAR processing, the signal compensation algorithm becomes more complex
Therefore, the current use of SAR radar is limited by many factors such as many imaging constraints, complex algorithms, large amount of calculation, long imaging processing time, and inability to simultaneously detect different scenes in the far, middle and near.

Method used

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  • SAR radar imaging method and system

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Experimental program
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Effect test

Embodiment 1

[0074] Embodiment 1: a kind of SAR radar imaging method (see attached figure 1 ), the method includes utilizing SAR technology to carry out signal processing on the echo signal received by the receiving antenna, and to synthesize a virtual aperture array signal; and adopting a fast imaging method, to perform imaging processing on the synthesized virtual aperture array signal and obtain an imaging detection result; wherein , the fast imaging method is based on the principle of lens imaging, combined with electromagnetic field theory, according to the target signal received by the antenna array, weighted by the amplitude and phase of the unit signal, and adopts an efficient parallel algorithm to obtain the image field distribution corresponding to the target. The specific algorithm as follows:

[0075]

[0076] Among them: j is the imaginary number unit, e is Euler's constant, is the image field distribution, is the target signal received by the array unit, A mn is the w...

Embodiment 2

[0115] Embodiment 2: This imaging method (method in embodiment 1) effect verification test

[0116] Test conditions: The operating frequency of the SAR system is 60GHz, and the target is two metal spheres 1km away and 2m apart. Using synthetic aperture technology, the synthetic aperture of the array is 5m*5m, and the angular resolution is better than 0.1°. Through SAR imaging, the above two metal ball targets can be easily distinguished. The imaging results are shown in the appendix image 3 .

Embodiment 3

[0117] Embodiment 3: a kind of SAR radar imaging method, adopts simplified method when this method is used for remote target imaging, comprises:

[0118] Choose R=∞, then there is φ F =0, the simplified formula suitable for long-distance imaging is:

[0119]

[0120] The above-mentioned efficient parallel algorithm is used to calculate the image field, and the target distribution in a wide viewing angle range is obtained through one operation.

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Abstract

The invention belongs to the technical field of SAR radar detection, imaging recognition and wireless communication, and particularly relates to an SAR radar imaging method and system and application of the SAR radar imaging method and system in all the fields. According to the method, based on the synthetic virtual array obtained through the SAR technology, a new imaging algorithm is adopted to process the array signal so as to obtain the imaging information of the target, the new imaging technology adopted by the method does not need different relative movement speeds of the target and the detection platform any more, and the method is an automatic focusing imaging algorithm, and the focusing compensation algorithm is simple and easy to implement. The imaging method is small in algorithm operand, high in imaging speed and capable of being compatible with application scenes of far, middle and near different distances and a single-base or multi-base radar platform, thereby having good application prospects.

Description

technical field [0001] The invention belongs to the technical fields of SAR radar detection, imaging recognition and wireless communication, and in particular relates to a SAR radar imaging method and its application in the above-mentioned fields. Background technique [0002] SAR (Synthetic Aperture Radar) is a synthetic aperture radar, which uses the principle of synthetic aperture to achieve high-resolution microwave imaging. SAR technology can synthesize a virtual array with a larger aperture through a moving detection platform, which can greatly reduce hardware costs and improve detection resolution. [0003] However, the existing SAR radar requires different relative motion speeds between the target and the detection platform during the detection process, and its imaging algorithm is extremely complex. When using focused SAR processing, the signal compensation algorithm becomes more complex. Therefore, the current use of SAR radar is limited by many factors such as ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9004
Inventor 俞晓琳张鑫张艺恒张继龙张继康宋雨花
Owner SUZHOU WEIMO ELECTRONIC INFORMATION TECH CO LTD