Title :
A solar calibration method for microwave Aperture Synthesis Radiometers
Author :
Jin, Rong ; Li, QingXia ; Dong, Jian ; Chen, LiangBing ; He, LinFeng ; Chen, Ke
Author_Institution :
Dept. of Electron. & Inf. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
The calibration of a microwave Aperture Synthesis Radiometer (ASR) is necessary for high-quality passive microwave imaging. Existing external calibration methods have difficulties for calibration of ASRs with large arrays. In this paper, a data model of correlation matrix containing phase and amplitude errors is established. Based on the correlation matrix, a solar calibration method for ASR is proposed to solve the problem. In the method, the amplitude errors are calculated by using the diagonal elements of the correlation matrix, and the phase errors are computed by employing the eigenvalue decomposition. The performance of the method is validated with the HUST-ASR system. Experimental results show that the microwave brightness temperature images with good quality are achieved.
Keywords :
calibration; correlation methods; eigenvalues and eigenfunctions; matrix algebra; microwave imaging; radiometers; radiometry; amplitude error; correlation matrix; diagonal element; eigenvalue decomposition; high-quality passive microwave imaging; microwave aperture synthesis radiometer; phase error; solar calibration method; Apertures; Automatic speech recognition; Brightness temperature; Calibration; Data models; Eigenvalues and eigenfunctions; Matrix decomposition; Microwave imaging; Microwave theory and techniques; Radiometers; Ka-band; amplitude error; aperture synthesis radiometer; calibration; external source; far field; phase error; solar;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-5705-2
DOI :
10.1109/ICMMT.2010.5524824
