Modeling And Calibration Of The Antenna Positon Errors On Synthetic Aperture Radiometer

Aperture synthesis radiometer(ASR) is a new array interferometric imaging system.The high resolution of the system is in cost of higher complexity of the hardware andsignal processing. But at the same time, the higher complexity has brought a wide varietyof errors to the system, and these errors would make a serious impact on the imagingresult of the system. Therefore, the error analysis and calibration are the key technologiesand difficulties to obtain high-quality inversion images. Currently, there are many studieson synthetic aperture radiometer error analysis have been done at home and abroad.However, the analysis and calibration of antenna position error has rarely been reported.This article will focus on the modeling and calibration of the antenna position errors onASR.Firstly, the state-of-art of ASR and study of the error analysis and calibration ispresented. The principle of ASR imaging is introduced in detail subsequently, and thecomplex correlation output which called visibility function expression is obtained. Basedon the visibility function expression of synthetic aperture radiometer, the impact ofantenna position errors on visibility function and the sensitivity of the system is obtained.The antenna position errors are classified on a staggered Y-array for an instance. Twodifferent calibration method is applied in two different arrays. The simulation resultsdemonstrate the effectiveness and limitations of the calibration methods.