Omni-directional side lobe suppression method for synthetic aperture radar imaging processing

A technology of synthetic aperture radar and sidelobe suppression, which is applied in the direction of utilizing re-radiation, radio wave reflection/re-radiation, measuring devices, etc., can solve the problems of large amount of computation, inapplicability to weak targets, etc., and achieve the effect of suppressing side lobes

Inactive Publication Date: 2012-10-10
BEIHANG UNIV
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Problems solved by technology

This method has a significant sidelobe suppression effect on strong point targets, but it is not suitable for weak targets and has a large amount of calculation

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  • Omni-directional side lobe suppression method for synthetic aperture radar imaging processing
  • Omni-directional side lobe suppression method for synthetic aperture radar imaging processing
  • Omni-directional side lobe suppression method for synthetic aperture radar imaging processing

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Embodiment Construction

[0030] The present invention will be further described in detail in conjunction with the accompanying drawings and simulation examples.

[0031] see Figure 1A As shown, the present invention carries out omnidirectional sidelobe suppression to the received echo signal based on the existing SAR signal processor, and the specific omnidirectional sidelobe suppression method includes the following processing steps:

[0032] Step 1: Convert the echo signal from 2D to 1D

[0033] Since the echo data received by the SAR signal processor is arranged in a two-dimensional matrix, in order to process the imaging area formed by the echo data, the present invention uses the two-dimensional echo data E 二维回波 Perform one-dimensional echo data E 一维回波 rearrangement of .

[0034] In the present invention, the two-dimensional echo data E of synthetic aperture radar 二维回波 Expressed in matrix form as:

[0035] In the present invention, the one-dimensional echo data E of synthetic aperture rad...

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Abstract

The invention discloses an omni-directional side lobe suppression method for synthetic aperture radar imaging processing. The method comprises the following steps of: arranging two-dimensional echo signals obtained by synthetic aperture radar into one-dimensional data; determining an imaging plane region position; constructing into a measuring matrix corresponding to an imaging plane; and finally, processing the one-dimensional echo data by using a linear least square method in combination with a measuring matrix, thereby realizing omni-directional side lobe suppression of a synthetic aperture radar imaging result and obviously reducing the energy leakage. Thus, the energy leakage of the imaging result of the processed satellite-borne echo data is the minimum, and further, the aim of suppressing side lobe is fulfilled. The omni-directional side lobe suppression method has no special requirement on target scattering intensity, can be used for imaging processing of any scene target and has a wide application range.

Description

technical field [0001] The present invention relates to a signal processing method of synthetic aperture radar, more particularly, refers to an omnidirectional side lobe suppression method for synthetic aperture radar imaging processing. Background technique [0002] Synthetic Aperture Radar (SAR) system is an active remote sensing device, which actively transmits electromagnetic waves to the target, and uses the echo signal received by the target scattering characteristics for imaging. Spaceborne SAR is a very complex system with many system parameters that are interrelated and restrict each other. In the range direction, the radar transmits a chirp signal, and performs pulse compression on the echo signal to obtain a higher resolution in the range direction; in the azimuth direction, the radar platform of the satellite changes the relative position of the beam and the target during the advancing process, forming Equivalent linear array antenna, thus improving azimuth reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 于泽刘敏肖鹏李春升
Owner BEIHANG UNIV
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