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Sea surface ship target imaging method and device under high sea condition

A target imaging and ship technology, which is applied to measurement devices, radio wave reflection/re-radiation, and utilization of re-radiation, etc. The effect of overcoming resolution blur and improving engineering application prospects

Active Publication Date: 2020-04-03
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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  • Sea surface ship target imaging method and device under high sea condition
  • Sea surface ship target imaging method and device under high sea condition
  • Sea surface ship target imaging method and device under high sea condition

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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 a high sea condition, and relates to the technical field of airborne radar imaging. The method comprises the followingsteps: correcting according to inertial navigation information, and converting an original echo signal into a distance-time domain; then carrying out time-frequency transformation, and converting theecho signal of the distance-time domain into a distance-time-frequency domain; radon transformation is carried out, the acceleration of irregular motion of the sea surface ship target is solved, andhigh-order phase compensation is carried out accordingly; and carrying out azimuth Fourier analysis to obtain an imaging result of the sea surface ship target. The method is suitable for airborne radar imaging, the problem that the resolution is fuzzy when the sea surface ship target is imaged under the high sea condition is solved, high-resolution imaging of the ship target is achieved. Meanwhile, hardware improvement does not need to be conducted on existing radar equipment, and the method has good engineering application prospects.

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...

Claims

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Application Information

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Patent Type & Authority Applications(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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