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A refined radar imaging method for ships on the sea surface by a mobile platform

A radar imaging and platform technology, which is applied to instruments, measuring devices, utilizing re-radiation, etc., can solve the problems of large radar beam width, wide coverage area, difficult ship target imaging, etc., and achieve the effect of improving performance

Active Publication Date: 2022-07-05
ROCKET FORCE UNIV OF ENG
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  • Abstract
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  • Claims
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Problems solved by technology

In addition, ISAR imaging methods generally can only process a single target. For mobile platform imaging radars, due to the volume limitation and task requirements of the platform, the radar beam width is generally large and the coverage area is wide
Therefore, in most cases, there are multiple ship targets in the beam coverage area, and it is difficult to directly apply ISAR technology to complete imaging of ship targets

Method used

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  • A refined radar imaging method for ships on the sea surface by a mobile platform
  • A refined radar imaging method for ships on the sea surface by a mobile platform
  • A refined radar imaging method for ships on the sea surface by a mobile platform

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Embodiment Construction

[0083] The specific design of the mobile platform of the present invention to the refined radar imaging method of the sea surface vessel is as follows:

[0084] (1) Coarse focus of the mobile platform on the surface ship target

[0085] The existing airborne imaging methods for ships on the sea only consider the smooth and straight flight of the aircraft, and do not consider the impact of platform maneuverability on imaging, which is difficult to meet the high-resolution imaging task requirements of mobile platforms for surface ships. The mobile SAR platform has three-dimensional initial velocity and three-dimensional acceleration, and the flight trajectory is a curve. figure 1 shown.

[0086]Assuming that within the echo acquisition time, the radar P from point A pass point B movement to the point C , establish the platform coordinate system OXYZ , the initial velocity of the maneuvering SAR platform v =( v x , v y , v z ),in v x =0, acceleration a =( a x ...

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Abstract

The invention discloses a refined radar imaging method for ships on the sea surface by a mobile platform: step 1, the mobile platform collects echo signals of the ships on the sea surface, and demodulates them to obtain baseband echo signals; step 2, performs range pulse on the baseband echo signals pressure, walking correction, and Doppler center compensation preprocessing to obtain the compensated signal; step 3, multiply the compensated signal by the acceleration compensation reference function to obtain the acceleration compensated signal; step 4, compare the acceleration compensated signal The azimuth pulse pressure processing is performed to obtain the coarse focus SAR image of the ship target I ; Step 5, detect the candidate ship target; Step 6, get the signal S 7_walk ; Step 7, extract the corresponding target azimuth signal; Step 8, carry out PGA compensation; Step 9, adopt the Dechirp-clean method to process and obtain the processed data of all azimuth directions, thereby obtaining the refined image of the mobile platform to the surface ship target. After inspection, the present invention can complete the refined imaging of the ship target.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar imaging, mainly to the field of radar imaging of marine targets by a mobile platform, and relates to a refined radar imaging method for marine vessels by a mobile platform. Background technique [0002] The radar imaging technology of marine targets is an important means of sea surveillance and reconnaissance. It can obtain the contour information of marine targets all day, all weather, and provides important support for marine surveillance, law enforcement, military reconnaissance and other activities. Inadequacy of other surveillance and reconnaissance methods such as optics and infrared. SAR imaging has the characteristics of long-distance and high-resolution, and can perform all-day and all-weather real-time observation and imaging of key areas. Existing imaging SAR systems for ships on the sea are often installed on airborne platforms to complete monitoring tasks in key area...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S13/937
CPCG01S13/9004G01S13/937G01S7/415
Inventor 杨剑梁毅曾裕贵姚志成凃育维
Owner ROCKET FORCE UNIV OF ENG
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