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Large squint sliding spotlight SAR (synthetic aperture radar) imaging processing method

A technique of sliding beamforming and imaging processing, applied in the field of signal processing

Inactive Publication Date: 2011-09-07
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high-precision imaging processing under the high-resolution mode of high squint, and propose a high squint sliding spotlight SAR imaging processing method

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  • Large squint sliding spotlight SAR (synthetic aperture radar) imaging processing method

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Embodiment Construction

[0070] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0071] The present invention is a large squint sliding spotlight SAR imaging processing method, the working process is as follows figure 1 shown, including the following steps:

[0072] Step 1: Azimuth to Deramp processing;

[0073] Since the radar system adopts the beamforming / sliding beamforming working mode, the azimuth Doppler bandwidth of the echo signal is much larger than the pulse repetition frequency of the radar system, so avoiding azimuth spectrum aliasing becomes a prerequisite for high-precision imaging processing. At the same time, considering that under the condition of high squint, the echo signal has a large amount of distance walk. As a result, the data volume of the echo signal increases sharply without increasing the number of effective observation scenes. Therefore, in the present invention, the change of the reference slant dis...

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Abstract

The invention discloses a large squint sliding spotlight SAR(synthetic aperture radar) imaging processing method, which belongs to the signal processing field. The processing method mainly comprises the following five parts, namely directional Deramp processing, two-dimensional phase compensation, interpolation processing, image coarse focusing and directional secondary focusing; the large squintsliding spotlight SAR imaging processing method has high accuracy and can realize accurate focusing in a full scene by using a secondary focus technology for compensating the spare-varying feature ofa Doppler parameter; in addition, the processing method has high efficiency, since distance migration induced by a reference slant distance in an echo signal is removed so as to greatly reduce data volume of the echo signal and improve the processing efficiency; moreover, the processing method has strong practicability and can realize the high-precision imaging process in a large squint angel mode; compared with the traditional imaging processing method, the large squint sliding spotlight SAR imaging processing method has better practicability.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a SAR imaging processing method, in particular to a large squint sliding spotlight SAR imaging processing method. Background technique [0002] Synthetic Aperture Radar (SAR) is an active remote sensor that works in the microwave frequency band. , in some cases, it can play a role that other remote sensing methods cannot. [0003] The high-precision imaging processing algorithm is the basis for obtaining high-quality radar images, and it is also the prerequisite for the application of SAR systems. Due to the inherent range and azimuth coupling phenomenon in the echo signal, the imaging processing of the SAR echo signal cannot be realized by two one-dimensional matched filter processing. At present, there are mainly four types of imaging processing methods for spaceborne SAR echo signals: the first type of imaging processing method uses the echo signals in the same range gate to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 王鹏波陈杰杨威李春升
Owner BEIHANG UNIV
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