Uniform circular multiphase modulation correlation radiometer and its sensitivity analysis

被引：0
|
作者：
Chen R. [1 ]
Luo J. [1 ]
Hu A. [1 ]
Miao J. [1 ]
机构：
[1] School of Electronic Information Engineering, Beihang University, Beijing
来源：
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | 2023年 / 49卷 / 07期
基金：
中国国家自然科学基金;
关键词：
correlation radiometer; least squares fitting; multiphase modulation; radiometry; sensitivity;
D O I：
10.13700/j.bh.1001-5965.2021.0560
中图分类号：
学科分类号：
摘要：
A correlation radiometer structure with uniform multiphase modulation around the circumference is proposed in order to address the issue of decreased measurement accuracy caused by the operational amplifier’s offset drift and gain fluctuation in correlation radiometers. The measurement result is processed using the least square fitting method, which removes the influence of the operational amplifier’s offset drift on the measurement deviation. Based on the structure of the correlation radiometer and the noise statistical model, the expression of the temperature sensitivity of the uniform circular multiphase modulation correlation radiometer is computed, and the relationship between the system sensitivity and phase modulation order, gain fluctuation and phase shift error is analyzed. The analysis shows that with the increase of the modulation order, the influence of gain fluctuation and phase modulation error on the sensitivity becomes smaller, and the sensitivity of the uniform circular multiphase modulation correlation radiometer tends to the sensitivity of the ideal correlation radiometer. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：1857 / 1863
页数：6
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