Target detection method based on ATI-SAR image amplitude and phase information fusion

A technology of ATI-SAR and target detection, which is applied in the field of target detection based on the fusion of amplitude and phase information of interferometric SAR images along the track, can solve the problems of not considering the randomness of local sea surface motion, not strictly considering the registration of dual-channel images, weakening Target feature strength etc.

Active Publication Date: 2017-12-22
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

However, this method does not strictly consider the dual-channel image registration problem, and the global sea surface equivalent interferometric phase used in the interferometric phase cancellation does not consider the randomness of local sea surface motion; the established "multiplicative" amplitude-phase info

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  • Target detection method based on ATI-SAR image amplitude and phase information fusion

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[0064] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0065] The basic flow of the target detection method based on the fusion of ATI-SAR image amplitude and phase information proposed by the present invention is as follows: figure 1 As shown, the specific implementation steps are as follows:

[0066] Step 1: If figure 1 As shown in the middle box 1, the two-channel image registration from coarse to fine

[0067] First, if figure 2 As shown, the offset of the dual-channel complex image obtained by the master-slave ATI-SAR imaging geometry along the azimuth direction is Δx=b, and the phase deviation is ΔΦ=exp(j4πv a bt a / λR 0 ), b is the baseline length, v a is the radar platform speed, t a is the slow time sampling, λ is the wavelength, R 0 is the shortest slant distance between the radar and the target. According to this characteristic, the front-channel image is used as the reference, ...

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Abstract

A target detection method based on ATI-SAR image amplitude and phase information fusion includes the following steps: correcting the amplitude offset and phase deviation of a dual-channel ATI-SAR image using a coarse-to-fine image registration technology; carrying out compound interferometric treatment on the dual-channel image to extract the interference amplitude and phase components, and acquiring interferometric phase components characterizing the target-sea surface relative radial motion in an interferometric phase domain through sea clutter equivalent interferometric phase estimation and cancellation based on automatic indexing and domain decomposition; and establishing an interferometric amplitude and phase 'modulus' related criterion, and detecting a target using an adaptive threshold algorithm in an MIMP feature domain. Fine registration of a dual-channel image can be realized under the condition of low precision of parameters such as platform speed and baseline length. Through full consideration and removal of interference caused by random fluctuation movement of background clutter, a universal MIMP criterion is established. The target-clutter contrast is enhanced by making effective use of interferometric amplitude and phase information. The ability to detect multiple targets or weak targets in a complex scene is improved.

Description

technical field [0001] The invention belongs to the technical field of radar target recognition, and in particular relates to a target detection method based on along-track interferometry (ATI) SAR image amplitude-phase information fusion. Background technique [0002] Synthetic aperture radar (SAR) has important application value in the fields of maritime traffic supervision, fishery management, maritime search and rescue, and maritime military target reconnaissance because of its all-day and all-weather imaging capabilities and wide observation range. Target detection is one of the key processing technologies of the SAR image target monitoring system. It can extract the target area of ​​interest from the complex background and provide the necessary target information input for subsequent feature extraction and classification recognition. Its performance has a great impact on the recognition accuracy of the entire monitoring system. and efficiency have a crucial impact. ...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9023G01S13/9029
Inventor 顾丹丹张元王晓冰徐秀丽
Owner SHANGHAI RADIO EQUIP RES INST
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