Open AccessEfficient autofocus of small multi‐rotor UAV SAR by minimum entropy BP algorithm
Author(s) -
Su Hao,
Wei Shunjun,
Zhang Xiaoling,
Pu Limin,
Yang Xiaoliang
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0625
Subject(s) - autofocus , computer science , synthetic aperture radar , position (finance) , conjugate gradient method , computer vision , estimator , entropy (arrow of time) , algorithm , artificial intelligence , mathematics , focus (optics) , statistics , physics , finance , quantum mechanics , optics , economics
Small multi‐rotor unmanned aerial vehicles (SMR‐UAVs) are a promising platform for low‐cost synthetic aperture radar (SAR) systems. However, SMR‐UAVs usually suffer from serious position errors due to their unstable motion and low actuary position sensors, and autofocus is an indispensable step for their high‐quality imaging. An efficient back‐projection autofocus method is proposed for SMR‐UAV SAR systems by the principle of minimum entropy. The position error estimation model via minimum entropy is derived. The conjugate‐gradient method is used to efficiently estimate the position errors. Moreover, to improve the computing efficiency, the strong scatterer areas are estimated as the input of entropy estimation. The effectiveness of the algorithm is demonstrated using both simulation and experimental data.