Motive target imaging method of synthetic aperture radar

Abstract

The invention relates to a synthetic aperture radar motion object imaging method which comprises steps of: 1. impulse sampling for each impulse to compress distance; 2. performing FFT on each impulse sampling between coherent treating spaces and make them enter into orientation frequency domain, judging output of each frequency channel to get instantaneous amplitude, slant range and Doppler frequency shift as the properties set of motion objects; 3. aggregating mass center; 4. tracking mass center dot trace; 5. getting Doppler parameters and distance migration sequence of motion object; 6. correcting distance migration; 7. orientation focus; 8. accurately indicating focusing motion object image. The invention has the advantages of being able to take advantages of detecting dot trace information to realize motion object data block in the division of whole data block, and of being able to realize the separately detecting, tracing and imaging for multiple motion objects.

Description

technical field [0001] The invention relates to a synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR) signal processing method, in particular to a method for imaging a SAR moving target. Background technique [0002] Synthetic Aperture Radar (SAR) has excellent characteristics such as all-weather, all-weather, and penetrating, and has a wide range of applications in civil and military fields such as navigation, remote sensing, surveying and mapping, reconnaissance, warning, and fire control. Traditional SAR can only image large-area static scenes, and does not have the ability to detect and image moving targets. In contrast, traditional detection radars can only detect moving targets, but cannot provide background information. Therefore, acquiring static scenes and imaging moving targets at the same time has become an urgent requirement for the new system multi-modal SAR. [0003] For this reason, many effective moving target detection methods have been...

AI Technical Summary

Problems solved by technology

This method can obtain the "focused image" of the ship target in the calm water background, but it requires a sufficient signal-to-noise ratio, otherwise the ISAR's motion compensation (envelope registration and self-focusing) performance, as well as the final imaging effect will be negative. A sharp decline

Moreover, the hybrid SAR / ISAR method still has many shortcomings such as difficult data segmentation and difficulty in realizing multi-target imaging.

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