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Satellite-borne three-channel SAR-GMTI self-adaptive clutter suppression method

An adaptive clutter, three-channel technology, applied in the field of radar, can solve the problems of ignoring the data correlation of adjacent Doppler cells, limiting the clutter suppression performance, and limiting the detection ability.

Inactive Publication Date: 2014-10-01
XIDIAN UNIV
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Problems solved by technology

The inventors found that the above method ignores the correlation of adjacent Doppler unit data, thereby limiting the clutter suppression performance of the multi-channel SAR-GMTI system, and thus limiting the system's ability to detect targets

Method used

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Embodiment Construction

[0061] Reference figure 1 , Explain that the satellite-borne three-channel SAR-GMTI adaptive clutter suppression method of the present invention is used to suppress the ground clutter received by the three-channel SAR-GMTI system. The specific steps are as follows:

[0062] Step 1. Establish the target original echo signal model, obtain the target echo signal in the range frequency domain according to the original target echo signal; construct the range frequency domain range compression filter according to the target echo signal in the range frequency domain; According to the range frequency domain target echo The signal and range frequency domain range compression filter obtains the range Doppler domain target echo signal after range compression.

[0063] Observation geometry of the oblique-range plane three-channel SAR-GMTI system figure 2 Shown: the equivalent phase center distance between channel 1 and channel 2 is d, the equivalent phase center distance between channel 2 and ...

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Abstract

The invention discloses a satellite-borne three-channel SAR-GMTI self-adaptive clutter suppression method and relates to self-adaptive clutter suppression. The method comprises the first step of obtaining distance Doppler domain target echo signals after distance compression, the second step of obtaining distance Doppler domain echo signals after distance compression, the third step of obtaining data X1 of a first distance unit to be detected of three channels, the fourth step of obtaining data of multiple Doppler units subjected to self-adaptive clutter suppression in the first distance unit to be detected, and the fifth step of making the number l of the distance unit to be detected to be increased by one, repeating the second step, the third step and the fourth step until l is equal to L, namely completing clutter suppression of L distance units, and then outputting data Y of the L distance units subjected to clutter suppression. The satellite-borne three-channel SAR-GMTI self-adaptive clutter suppression method is used for suppressing ground clutter received by a three-channel SAR-GMTI system.

Description

Technical field [0001] The invention belongs to the field of radar technology, and relates to adaptive clutter suppression, and specifically is a spaceborne three-channel synthetic aperture radar (Synthetic Aperture Radar, SAR)-ground moving target detection (Ground Moving Target Indication, GMTI) adaptive clutter The wave suppression method is used to suppress the ground clutter received by the three-channel SAR-GMTI system. Background technique [0002] The concept of synthetic aperture and the invention of SAR were a major breakthrough in the history of radar technology in the 20th century. SAR obtains high resolution in distance by transmitting large bandwidth signals, and relies on the relative movement between the radar platform and the target to form a large synthetic aperture, thereby obtaining high resolution in azimuth. The acquisition of high-resolution range and azimuth enables SAR to acquire two-dimensional images of large surveying strips similar to optical imaging...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/2923G01S7/2928G01S13/90G01S13/9029
Inventor 王彤李永康张颖吴建新
Owner XIDIAN UNIV
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