A system and method for SAR imaging simulation test of moving target under sea background

Abstract

The invention relates to a moving target SAR imaging simulation test system and method under a sea background. Through the wave-making pool, the ship model placed in it simulates the sea environment; the target linear motion simulation device drives the target ship model to move in a straight line at a uniform speed; the attitude measurement sensor acquires and records the target attitude information during the movement in real time; the radio frequency subsystem, Carry out radio frequency signal transmission and target echo signal reception; scan rack sub-system, place and drive the radio frequency sub-system to perform equal interval stepping motion, and use the radio frequency sub-system to perform a broadband frequency sweep measurement on the target at each step interval . Based on the principle of spotlight SAR imaging, the present invention realizes the collaborative simulation test of the composite scattering characteristics and motion characteristics of sea surface ships in the wave pool, and solves the problem of synchronous and controllable simulation measurement of the composite scattering characteristics and motion of moving targets on the sea surface under laboratory conditions. It can provide basic data and verification means for the research on imaging detection and recognition technology of moving targets on the sea surface.

Description

technical field [0001] The invention belongs to the technical field of radar target characteristic testing, and in particular relates to a moving target SAR imaging simulation testing system and method under a sea background. Background technique [0002] Synthetic Aperture Radar (SAR) imaging is an important means of surface ship target detection, surveillance and identification. However, ships on the sea are non-cooperative targets, especially those driven by waves. The target motion is extremely non-stationary, which will introduce complex amplitude-phase modulation in the radar echo, causing SAR imaging defocus, and as the signal accumulates As the time increases, the impact of target motion on SAR imaging focus is more obvious. Therefore, it is urgent to study the mechanism of the influence of sea surface target motion characteristics on SAR imaging defocus, so as to provide basis and support for the research of sea surface moving target fine-focus imaging detection an...

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Problems solved by technology

In their 2016 paper "Research on Large-scale Model Wave Load Test Technology in Actual Wave Environment", Jiao Jialong and others from Harbin Engineering University studied the system and method for testing the motion characteristics of scaled ship models in coastal waters; however, These two methods only simulate and test the motion characteristics of sea ships, and do not consider the compound scattering characteristics of sea ships

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