Unmanned aerial vehicle SAR self-focusing method based on aerial carrier track deviation estimation

A self-focusing and track technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of inability to adapt to envelope errors, inability to equip high-precision inertial navigation, and defocusing of imaging results. and other problems to achieve the effect of solving two-dimensional space variability and achieving self-focusing
CN112578380APending Publication Date: 2021-03-30BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2021-03-30

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Abstract

The invention discloses an unmanned aerial vehicle SAR self-focusing method based on aerial carrier track deviation estimation. According to the method, the aerial carrier track deviation is estimatedon the basis of echo data, and the accurate estimation of the aerial carrier track deviation is realized by utilizing a coarse-to-fine step-by-step self-focusing strategy, so that the two-dimensionalspace-variant property of motion errors is fundamentally solved, the low-speed unmanned aerial vehicle-mounted SAR self-focusing is realized, and a high-resolution unmanned aerial vehicle-mounted SARimage is obtained.
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Description

technical field

[0001] The invention relates to the technical field of synthetic aperture radar, in particular to an unmanned aerial vehicle-borne synthetic aperture radar (SAR) self-focusing method based on aircraft track deviation estimation. Background technique

[0002] UAV-borne SAR is a technology that uses UAVs for synthetic aperture imaging, which can achieve all-day and all-weather earth observation, and is widely used in terrain exploration and battlefield reconnaissance. At present, azimuth wide-beam imaging and motion compensation for slow UAV-borne SAR have become a hot spot in the development of UAV-borne SAR technology.

[0003] Due to its small size (such as 20 cm square), light weight (such as a 1 kg UAV-borne SAR system), low flying altitude and slow flying speed (such as a flying height of 200 meters and a flying speed of 20 meters per second), it is affected by airflow. Influenced by its own simple dynamic structure, the flight trajectory of slow-speed U...

Claims

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