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Subaperture Wavenumber Domain Imaging Method for Squint Sliding Bunch SAR

A technology of sliding beamforming and imaging method, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc. It can solve the problem that the squint situation cannot be fully applied.

Inactive Publication Date: 2017-01-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
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  • Description
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Problems solved by technology

However, the sub-aperture method that is suitable for frontal and side-looking situations is not fully applicable for squinted situations

Method used

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  • Subaperture Wavenumber Domain Imaging Method for Squint Sliding Bunch SAR
  • Subaperture Wavenumber Domain Imaging Method for Squint Sliding Bunch SAR
  • Subaperture Wavenumber Domain Imaging Method for Squint Sliding Bunch SAR

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0055] This embodiment uses SAR simulation data to verify and analyze this method. The simulation data is set as follows: the radar bandwidth is 300MHz, the carrier frequency is 10GHz, the signal time width is 20μs, the pulse sampling frequency is 360MHz, and the pulse repetition frequency PRF is 1000Hz , the speed of the carrier aircraft is 120m / s, the moving speed of the antenna irradiation area on the ground is 60m / s, and the height of the carrier aircraft is 10km. SAR simulation data azimuth sampling points N r is 16384, the number of sampling points N in the distance direction a is 16384, the number of azimuth sampling points N of a single sub-aperture ai It is 8192, and the oblique angles are respectively 0°, 20°, 30°, and 40° for simulation.

[0056] refer to figure 1 , figure 2 , the flying platform speed is V a , the center of the r...

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Abstract

The invention discloses a subaperture wave number domain imaging method for a squint sliding spotlight SAR (Synthetic Aperture Radar). A traditional sliding spotlight SAR subaperture method is improved aiming at squint conditions. The subaperture wave number domain imaging method comprises the following steps: firstly, overlapping a whole aperture and dividing subapertures; taking an extended wave number domain method used for the squint conditions as a subaperture basic imaging method; and finishing azimuth processing in a distance Doppler domain by adopting an improved BAS method to splice the subapertures, so as to obtain a whole aperture image under the squint conditions. With the adoption of the subaperture wave number domain imaging method, the problems of the squint sliding spotlight SAR of large data size, non-zero azimuth Doppler center and oversized Doppler bandwidth are solved, and the practical value is larger.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to a sub-aperture wavenumber domain imaging method of a squint sliding spotlight SAR. Background technique [0002] Synthetic aperture radar is an all-weather and all-weather high-resolution imaging radar, which plays an important role in both military and civilian fields. Sliding spotlight mode is a new Synthetic Aperture Radar (SAR) imaging mode, which controls the azimuth resolution by controlling the moving speed of the antenna irradiation area on the ground, and obtains a larger imaging area than the spotlight mode , higher azimuth resolution than a strip pattern of the same antenna size. Therefore, the sliding spotlight mode is widely used in both airborne and spaceborne SAR. [0003] In the sliding spotlight mode, the synthetic aperture time of the target is long, and the Doppler frequency center of the echo changes with the azimuth position of the target, resulting i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9011G01S13/9041
Inventor 张劲东邱晓燕陈家瑞唐笑为史常丽李旭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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