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Method of dual airborne sar for target cooperative imaging stereotaxic positioning

A stereoscopic positioning and target technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve the problems of pixel position information, inaccessibility, etc., and achieve the effect of reducing the amount of calculation, effective detection and positioning

Active Publication Date: 2022-02-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The existing bistatic airborne SAR technology commonly uses two radars as the transmitter and the receiver respectively. This method cannot obtain the actual position of the target by directly analyzing the equations from the pixel position information of the target in the SAR image. information

Method used

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  • Method of dual airborne sar for target cooperative imaging stereotaxic positioning
  • Method of dual airborne sar for target cooperative imaging stereotaxic positioning
  • Method of dual airborne sar for target cooperative imaging stereotaxic positioning

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Embodiment

[0072] In this embodiment, taking the positioning of a ship target in a cluttered ocean environment as an example, an exemplary implementation manner of the present invention is described in detail.

[0073] figure 1 A schematic diagram of the structure of a dual airborne SAR for target collaborative imaging stereotaxic positioning proposed by the present invention, mainly composed of two SAR radars with two fixed-wing unmanned aerial vehicles as platforms, and the two unmanned aerial vehicles are in the same direction in the target area Fly both sides while imaging the scan area.

[0074] figure 2 The general flow chart of a kind of dual-airborne SAR that proposes for the present invention is to the stereotaxic positioning of target cooperative imaging, and concrete implementation steps are:

[0075] The first step is to use the range Doppler imaging algorithm to perform high-resolution imaging on the echo data of the sea surface scanning area received by the two airborne ...

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Abstract

The invention discloses a method for stereo positioning of a target by dual airborne SAR cooperative imaging. Imaging of the scene; two high-resolution SAR images are processed by dual-parameter CFAR, the target area is detected according to its geometric characteristics, and the geometric center of the target area is taken respectively, and the pixel coordinates corresponding to the target gray-scale area are output; the image point The coordinate matrix is ​​substituted into the positioning solution model, combined with the system parameters and orientation parameters of the two SARs, the coordinates of the target in the Cartesian coordinate system are calculated through Newton iterative solution. The invention can directly solve the calculation after obtaining the image point coordinates of the target in the image, thereby greatly reducing the calculation amount and improving the real-time performance.

Description

technical field [0001] The invention belongs to the technical field of SAR positioning, and in particular relates to a method for stereo positioning of a target with cooperative imaging by dual airborne SARs. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather and all-weather earth observation capabilities. SAR has been widely used in ocean monitoring and has exerted huge social, economic and military benefits. Due to the different imaging bands, the SAR system can obtain ground object information different from that of the optical system. [0003] In general, military targets are composed of brighter scattering centers on radar images, so threshold segmentation technology can be used to achieve target detection. However, in the random and complex clutter background, the contrast between the background and the target changes in the image formed by SAR, and the image segmentation technology with a fixed threshold often produces more false targets. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9005G01S13/9058
Inventor 肖泽龙张秋霞许建中吴礼张晋宇邵晓浪朱苇杭
Owner NANJING UNIV OF SCI & TECH
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