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Efficient terahertz stepping frequency synthetic aperture radar imaging method

A technology of synthetic aperture radar and stepping frequency, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., to achieve real-time high-resolution imaging, improve imaging speed, and reduce the amount of calculation.

Active Publication Date: 2021-04-30
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology

However, CSA can only be used to process echo signals in the form of linear frequency modulation, and cannot be directly used for THz step frequency SAR imaging

Method used

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  • Efficient terahertz stepping frequency synthetic aperture radar imaging method
  • Efficient terahertz stepping frequency synthetic aperture radar imaging method
  • Efficient terahertz stepping frequency synthetic aperture radar imaging method

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Embodiment Construction

[0053]THz stepping frequency SAR has urgent application requirements in medical detection, security inspection, etc. The particularity of medical detection and security inspection requires that the imaging algorithm must complete the processing in a short enough time. In this case, the real-time performance of the algorithm becomes a measure of the algorithm. one of the important criteria. In order to improve the imaging speed to meet the requirements of real-time imaging on the premise of ensuring the imaging accuracy of THz stepping frequency SAR, the present invention proposes an efficient THz stepping frequency SAR real-time imaging method based on CSA.

[0054] The invention provides an efficient terahertz (terahertz, THz) stepping frequency synthetic aperture radar (synthetic aperture radar, SAR) imaging method. The main contribution is to successfully apply CSA to THz stepped frequency SAR imaging, and to solve the problem that the existing THz stepped frequency SAR ima...

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Abstract

The invention discloses an efficient terahertz stepping frequency synthetic aperture radar imaging method. The method comprises the following steps: processing a terahertz stepping frequency synthetic aperture radar echo signal to obtain a frequency domain synthetic broadband signal; and converting the distance direction signal of the frequency domain synthetic broadband signal into a linear frequency modulation signal; and processing the distance direction signal into the linear frequency modulation signal by using a CS algorithm to obtain a synthetic aperture radar imaging result. According to the invention, on the premise of ensuring the imaging precision, the imaging speed is improved, and real-time high-resolution imaging is carried out on a target. According to the method, the traditional CSA is improved, the defect that the traditional CSA can only be applied to a linear frequency modulation system radar is overcome, and a new algorithm suitable for THz stepping frequency SAR imaging is provided. Compared with other imaging algorithms, the calculation amount is smaller, and the cost is lower when the method is put into practical application.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar imaging, in particular to an efficient terahertz stepping frequency synthetic aperture radar imaging method. Background technique [0002] Modern radar has the characteristics of high sensitivity, strong anti-jamming ability, high flexibility and high range resolution. Among them, high range resolution is particularly important. The resolution of a radar system depends on its bandwidth. The larger the system bandwidth, the higher the resolution, but the increase of the instantaneous system bandwidth brings a great burden to the hardware. Due to economic and hardware constraints, it is difficult to directly implement large-bandwidth signals in the system. Under the existing hardware conditions, there are several methods to obtain large bandwidth signals indirectly, and the step frequency waveform is one of the commonly used methods. The main idea of ​​the step frequency waveform...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 张群英王闯胡建民李超史姝赟方广有
Owner AEROSPACE INFORMATION RES INST CAS
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