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Ultra-wideband frequency-modulated continuous wave SAR self-focusing imaging method

A technology of frequency modulation continuous wave and imaging method, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem that the self-focusing method is no longer applicable, and avoid physical calibration experiments, Wide application prospect and low dependence effect

Active Publication Date: 2021-08-06
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology

However, in connection with the particularity of the microwave photonic system, the above assumptions are not valid for image defocus caused by imaging parameters, and the existing self-focusing methods are no longer applicable

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  • Ultra-wideband frequency-modulated continuous wave SAR self-focusing imaging method

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Embodiment Construction

[0044] For a long time, the realization of large swaths and high-resolution imaging of scene objects has been the goal pursued by SAR in the field of remote sensing, which is of great significance in both civilian and military applications. The realization of the above functions requires the radar to have a large operating bandwidth and fast data processing capabilities. In terms of hardware system implementation, traditional electronic technology has been difficult to meet the design requirements. Microwave photonic technology is considered to be the main technical means of the new generation of radar in the future because of its advantages such as large broadband, low loss, and anti-electromagnetic interference, and has broad application prospects. However, because it can provide ultra-wideband and high-resolution signals, the system will face difficulties such as additional unknown time delay and wavelength drift. The current basic imaging algorithm cannot support it to achi...

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Abstract

The invention provides an ultra-wideband frequency-modulated continuous wave SAR self-focusing imaging method, which comprises the following steps of: utilizing motion parameters measured by an external sensor, and performing imaging by adopting a range migration algorithm to obtain a preliminary coarse focusing image; analyzing the characteristics of the two-dimensional error of the ultra-wideband frequency-modulated continuous wave SAR in the imaging process, and establishing an error model of a two-dimensional frequency domain; estimating and compensating a range migration error on the basis of the error model of the two-dimensional frequency domain; and estimating and compensating the azimuth phase error on the basis of the error model of the two-dimensional frequency domain. The invention provides a method for solving the two-dimensional defocusing of the ultra-wideband frequency-modulated continuous wave SAR image, and the method has the advantages that the process is simple and easy to implement; the operation complexity is low; and the dependence degree on a scene target is low.

Description

technical field [0001] The invention relates to the technical field of ultra-wideband FM continuous wave radar, in particular to an ultra-wideband FM continuous wave SAR self-focusing imaging method. Background technique [0002] Synthetic Aperture Radar (SAR), as a modern popular remote sensing technology, can penetrate clouds and fog, break through the limitations of time and space, and efficiently obtain high-resolution images. It is widely used in civilian and military fields. Target imaging, tracking and identification. It is also its broad and complex application scenarios that put forward higher requirements for the performance of the SAR system, such as: higher spatial resolution, larger surveying and mapping width, and faster response time. Therefore, corresponding to the realization of the radar system, the core requirement is high-speed manipulation of broadband signals, that is, generation, control, transmission, and processing of broadband signals. However, tr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/40
CPCG01S13/9021G01S13/9052G01S13/9094G01S7/40
Inventor 徐伟迪汪丙南向茂生
Owner AEROSPACE INFORMATION RES INST CAS
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