Unmanned airborne system for SAR imaging and moving-target detection by utilizing Ka-frequency-band frequency modulated continuous waves

Abstract

The invention discloses an unmanned airborne system for SAR imaging and moving-target detection by utilizing millimeter-wave Ka-frequency-band frequency modulated continuous waves. Ka-frequency-band wavelength is shorter, and an antenna is smaller than a lower-frequency-band antenna in size under the condition of the same beam width. A millimeter-wave device is smaller than a lower-frequency-band device in size, weight and power consumption. The system can be miniaturized, images finer than other lower-frequency-band images can be obtained by utilizing millimeter-wave Ka-frequency-band signals to perform SAR imaging, target edge and corner characteristics are obvious, and target recognition is facilitated. Ka-frequency-band signals of higher relative band width can be obtained, so that higher image resolution can be obtained compared with lower-frequency-band signals. The system for SAR imaging by utilizing the frequency modulated continuous waves is simple in device, low in complexity, small in data volume by adopting a de-chirp mode and capable of performing real-time imaging processing.

Description

technical field [0001] The invention belongs to the technical field of imaging radar, and in particular relates to an unmanned aerial vehicle-borne Ka-band FM continuous wave SAR imaging and moving target detection system. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave remote sensing device that can observe targets around the clock and obtain high-resolution images. Synthetic Aperture Radar Moving Target Detection (SAR-GMTI) technology can simultaneously acquire static and dynamic information in the scene, and it has received widespread attention as a modern reconnaissance method. [0003] Unmanned Aerial Vehicle (UAV) can replace pilots to perform dangerous tasks, which can reduce casualties, reduce equipment and use costs. Intelligence reconnaissance and battlefield surveillance are one of the main combat tasks of UAV systems at present. UAV has low requirements on the combat environment, can sneak into the sky over enemy targets for ...

AI Technical Summary

Problems solved by technology

The traditional low-frequency pulse system SAR has large volume, complex equipment, high cost, and is easily intercepted by the enemy's electronic reconnaissance system, which cannot meet the reconnaissance and surveillance needs of small UAVs.

[0005] In addition, the existing UAV FMCW (Frequency Modulated Continuous Wave) system SAR system mainly works in the X-band, most of which only have imaging mode, do not have the ability to detect moving targets, and cannot meet the needs of high-resolution fine imaging and moving target detection during UAV combat

Images