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Target positioning method and device, GMTI system and readable storage medium

A technology of target positioning and target orientation, which is applied in the field of target positioning methods, devices, GMTI systems and readable storage media, can solve the problems of baseline estimation accuracy influence, affecting target positioning performance, robustness decline, etc., to improve target positioning accuracy Effect

Pending Publication Date: 2021-03-26
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the channel phase error estimation method based on multi-wave bit clutter only compensates for specific errors, which is not only complicated to implement, but also interacts with different errors, which will inevitably affect the final target positioning performance.
In the precise positioning method of scanning GMTI moving targets, the influence of various non-ideal factors on the measured data is comprehensively considered, and the concepts of clutter suppression sharpening ratio and equivalent baseline are proposed, and the target positioning problem is transformed into an equivalent baseline estimation problem, but the method The robustness decreases when the nonlinear condition of the interferometric phase changes, and the baseline estimation accuracy will be affected by strong targets in the side lobe area

Method used

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  • Target positioning method and device, GMTI system and readable storage medium
  • Target positioning method and device, GMTI system and readable storage medium
  • Target positioning method and device, GMTI system and readable storage medium

Examples

Experimental program
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Effect test

Embodiment 2

[0108] In this embodiment, a set of X-band airborne multi-channel wide-area GMTI measured data is taken as an example to verify the performance of the present invention. The bandwidth of the radar signal is about 20MHz, there are 3 receiving antennas in the azimuth direction, and the average speed of the carrier aircraft is about 120m / s. According to the system parameters, the nominal d / λ is 12.54.

[0109] First, the method of suppressing the sharpening ratio is used to search for the optimal interferometric phase, and on this basis, a target positioning result in the Doppler domain of a wave position distance is given and analyzed to verify the performance of the method of the present invention. In addition, in practice, the final target needs to be marked on a map or remote sensing mapping image (SAR image, satellite infrared image or DBS image, etc.) that matches the actual terrain.

[0110] According to the principle of the interferometer, the clutter in any direction ac...

Embodiment 3

[0115] The third embodiment of the present invention provides a target positioning device, including:

[0116] a data processing unit for determining the target interferometric phase of different Doppler channels by suppressing the sharpening ratio; and,

[0117] determining the target azimuth according to the target interferometric phase;

[0118] A positioning unit, configured to complete positioning based on the target azimuth.

[0119] The embodiment of the present invention is used to realize the precise positioning of the target of the two apertures, mainly through the defined suppression sharpening ratio to determine the target interference phase of different Doppler channels, so that the target positioning can be realized according to the target interference phase, and the target positioning accuracy is improved. .

[0120] An embodiment of the present invention also provides a scanning moving target detection system, including the aforementioned target positioning d...

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Abstract

The invention discloses a target positioning method and device, a GMTI system and a readable storage medium. The method comprises the following steps: determining target interference phases of different Doppler channels by suppressing a sharpening ratio; determining a target azimuth angle according to the target interference phase; and completing positioning based on the target azimuth angle. According to the method, the target interferometric phases of different Doppler channels are determined through the defined suppression sharpening ratio, so that target positioning can be realized according to the target interferometric phases, and the target positioning precision is improved.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a target positioning method, device, GMTI system and readable storage medium. Background technique [0002] The wide-area GMTI system is also called the scan ground moving target indication (SCAN-GMTI) system. The two important functions of the system are Doppler beam sharpening (Doppler beamsharpening, DBS) imaging and target detection and positioning. Due to the influence of radial velocity, the position of a moving target on a DBS image or a synthetic aperture radar (synthetic aperture radar, SAR) image often deviates from its true position. In order to avoid intelligence misjudgment, after detecting a moving target, it is necessary to solve the real azimuth of the moving target and relocate it. [0003] As a non-focused imaging technology, DBS uses the Doppler diffusion caused by platform motion to distinguish echoes in different directions, achieving finer azimuth resolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/06G01S13/90G01S7/41
CPCG01S13/06G01S13/9021G01S7/414G01S7/415
Inventor 胡瑞贤张昭王永达贾秀权刘承平冯莉
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC