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GEO SAR ship target imaging method based on micro Doppler analysis

A technology of Doppler analysis and target imaging, applied in the field of synthetic aperture radar, which can solve the problems of long synthetic aperture time and inapplicability

Pending Publication Date: 2021-11-02
北京理工大学重庆创新中心 +1
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Problems solved by technology

Unfortunately, the synthetic aperture time of GEO SAR is very long (on the order of hundreds of seconds), and the influence of each dimension swing tends to be a multi-period sine function. As we all know, the sine function cannot be fitted by high-order Taylor expansion
Therefore, traditional ship imaging methods are not suitable for GEO SAR

Method used

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  • GEO SAR ship target imaging method based on micro Doppler analysis
  • GEO SAR ship target imaging method based on micro Doppler analysis
  • GEO SAR ship target imaging method based on micro Doppler analysis

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Embodiment 1

[0035] In order to solve the problem of how to realize the fitting of the influence of the platform on the three-dimensional swing within a long synthetic aperture time, this embodiment provides a GEO SAR ship target imaging method based on micro-Doppler analysis. When the ship target is at the equilibrium point When reciprocating nearby, micro-Doppler is produced. The swing of each dimension of the ship target is a reciprocating motion, which in turn produces micro-Doppler effects on the imaging of the ship. At the same time, GEO SAR has the characteristics of curved trajectory. Therefore, the key point of GEO SAR swinging ship target imaging is to realize the fitting of the three-dimensional swinging influence of the platform within a long synthetic aperture time.

[0036] This scheme fits the signal model affected by the swing through the accumulation of multiple sine functions, taking into account the characteristics of the GEO SAR curved trajectory and the non-negligible ...

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Abstract

The invention provides a GEO SAR ship target imaging method based on micro Doppler analysis. The method comprises the steps of employing a swing ship precise signal model of a GEO SAR formed by accumulation of a plurality of sine functions, redefining GKTGDP, enabling the GKTGDP to compensate the motion of the GEO SAR, estimating the frequency of the sine functions, achieving the estimation of the amplitude and initial phase of the sine functions through parameter searching, and realizing swinging ship target imaging through a back projection algorithm. The problem that fitting is affected by swinging in the long synthetic aperture time in GEO SAR is solved, and imaging of a swinging ship target is achieved.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a GEO SAR ship target imaging method based on micro-Doppler analysis. Background technique [0002] Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) is a SAR satellite operating in geosynchronous orbit. A GEO SAR satellite can cover one-third of the world every day, and can achieve repeated observations of key areas for 1.5-2.5 hours. Due to the characteristics of high resolution and wide coverage, GEO SAR has great advantages in ocean surveillance. [0003] However, the ship is affected by the wind and waves, showing a complex three-dimensional swing. The existing ship imaging methods all use high-order Taylor expansion to fit the swing effect within the synthetic aperture time of the order of seconds. Unfortunately, the synthetic aperture time of GEO SAR is very long (on the order of hundreds of seconds), and the swing effect of each dimension tends to...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9011
Inventor 董锡超胡程张颖崔畅
Owner 北京理工大学重庆创新中心
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