Moving-target SAR imaging simulation test system and method under sea background

Abstract

The invention relates to a moving-target SAR imaging simulation test system and method under a sea background. The moving-target SAR imaging simulation test method under the sea background includes the steps: through a wave generation pool, a sea environment for a ship model in the wave generation pool is simulated; a target linear motion simulation device drives the ship model which is taken as the target to do uniform linear motion; an attitude measurement sensor obtains and records the target attitude information during the motion process in real time; a radio frequency subsystem performs emission of radiofrequency signals and reception of target echo signals; and a scanning frame subsystem puts and drives the radio frequency subsystem to perform equidistant stepping motion, and every stepping one interval, the radio frequency subsystem is used to perform one time of broadband frequency sweep measurement on the target. Based on the spotlight type SAR imaging principle, the moving-target SAR imaging simulation test system and method under the sea background can realize the sea level ship composite scattering characteristic and motion characteristic cooperation simulation test inthe wave generation pool, can solve the problem of synchronously and controllably simulating the sea level moving target composite scattering characteristic and motion characteristic in the laboratorycondition, and can provide basic data and verification means for sea level moving target imaging detection and identification technological research.

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 recognition. 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 and r...

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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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