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.
CN112731392AActive Publication Date: 2021-04-30AEROSPACE INFORMATION RES INST CAS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AEROSPACE INFORMATION RES INST CAS
Publication Date
2021-04-30

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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.
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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...

Claims

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