Imaging method and device for sea surface ship target under high sea conditions

A target imaging and ship technology, applied in measuring devices, instruments, using re-radiation, etc., can solve the problems of increased irregular movement of ship targets, "fuzzy resolution, defocusing, etc., achieve good engineering application prospects, overcome The effect of resolution blur

Active Publication Date: 2021-12-28
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

However, when the airborne platform directly images the ship target, the imaging quality is low. This is mainly because the airborne motion platform has both SAR and ISAR components when imaging the sea ship target. If there is no fine motion Compensation, direct imaging of ship targets will cause defocusing, especially in high sea conditions, the irregular movement of ship targets will be further aggravated, resulting in "resolution blur" when imaging ship targets on the sea surface under high sea conditions

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  • Imaging method and device for sea surface ship target under high sea conditions
  • Imaging method and device for sea surface ship target under high sea conditions
  • Imaging method and device for sea surface ship target under high sea conditions

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[0027] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0028] Such as figure 1 As shown, the schematic flow chart provided for the embodiment of the imaging method of the present invention, the sea surface ship target imaging method under high sea conditions is SAR / ISAR hybrid imaging, including:

[0029] S1, acquiring inertial navigation information, constructing a first distance walking correction factor and a phase error compensation factor corresponding to the non-ideal motion of the airborne platform according to the inertial navigation information;

[0030] It should be noted that the inertial navigation information can be detected by the detection device of the airborne platform, including the motion vector of the moving platform in various directions, and th...

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Abstract

The invention discloses a sea surface ship target imaging method and device under high sea conditions, and relates to the technical field of airborne radar imaging. The method comprises: correcting according to the inertial navigation information, transforming the original echo signal into the distance-time domain; then performing time-frequency transformation, converting the echo signal in the distance-time domain into the distance-time-frequency domain; East transform to obtain the acceleration of the irregular movement of the sea surface ship target, and then perform high-order phase compensation; perform azimuth Fourier analysis to obtain the imaging result of the sea surface ship target. The present invention is suitable for airborne radar imaging, overcomes the problem of "resolution blur" when imaging sea surface ship targets under high sea conditions, and realizes high-resolution imaging of ship targets. At the same time, the present invention does not require the existing The hardware improvement of radar equipment has a good prospect of engineering application.

Description

technical field [0001] The invention relates to the technical field of airborne radar imaging, in particular to a SAR / ISAR hybrid imaging method and device for sea surface ship targets under high sea conditions. Background technique [0002] Inverse Synthetic Aperture Radar (Inverse Synthetic Aperture Radar, ISAR) uses the relative movement of the moving target relative to the radar to form a synthetic aperture for high-resolution imaging. However, when the airborne platform directly images the ship target, the imaging quality is low. This is mainly because the airborne motion platform has both SAR and ISAR components when imaging the sea ship target. If there is no fine motion Compensation, direct imaging of ship targets will cause defocusing, especially in high sea conditions, the irregular movement of ship targets will be further aggravated, resulting in "resolution blur" when imaging ship targets on the sea surface under high sea conditions . Contents of the invention...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 陈洪猛王新民张文杰高文权鲁耀兵
Owner BEIJING INST OF RADIO MEASUREMENT
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