圆周均匀多相调制相关辐射计及其灵敏度分析

陈锐厚; 罗景; 胡岸勇; 苗俊刚

doi:10.13700/j.bh.1001-5965.2021.0560

圆周均匀多相调制相关辐射计及其灵敏度分析

doi: 10.13700/j.bh.1001-5965.2021.0560

北京航空航天大学电子信息工程学院，北京 100191

基金项目: 国家自然科学基金(61731001)；中央高校基本科研业务费专项资金(FRF-BD-20-10A)

详细信息

作者简介:
陈锐厚男，硕士研究生。主要研究方向：微波毫米波辐射与散射测量技术

罗景男，硕士研究生。主要研究方向：综合孔径毫米波成像

胡岸勇男，博士，讲师，主要研究方向：干涉综合孔径微波辐射计天线阵列布局及成像处理

苗俊刚男，博士，教授，博士生导师，国家长江学者，杰青。主要研究方向：微波毫米波实时成像技术、微波遥感理论与技术、电磁散射与辐射测量技术等

通讯作者:
E-mail： hu_anyong@buaa.edu.cn

中图分类号: TN98
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出版历程
- 收稿日期: 2021-09-17
- 录用日期: 2022-01-09
- 网络出版日期: 2022-01-12
- 整期出版日期: 2023-07-31

Uniform circular multiphase modulation correlation radiometer and its sensitivity analysis

School of Electronic Information Engineering，Beihang University，Beijing 100191，China

Funds: National Natural Science Foundation of China (61731001); The Fundamental Research Funds for the Central University (FRF-BD-20-10A)

More Information

Corresponding author: E-mail：hu_anyong@buaa.edu.cn

摘要

摘要:
针对相关辐射计中由于运算放大器的零点漂移及增益起伏导致测量精度下降的问题，提出了在圆周上进行均匀多相调制的相关辐射计结构，利用最小二乘拟合方法对多相调制的测量结果进行处理，消除了运放零点漂移对相关辐射计测量偏差的影响。基于相关辐射计结构及噪声统计模型，推导了圆周均匀多相调制相关辐射计温度灵敏度的表达式，分析了系统灵敏度与调制阶数、增益起伏、调相误差的关系。分析表明：随着调制阶数的增加，增益起伏和调相误差对灵敏度的影响变小，圆周均匀多相调制相关辐射计的灵敏度趋于理想相关辐射计的灵敏度。
- 辐射测量 /
- 相关辐射计 /
- 灵敏度 /
- 多相调制 /
- 最小二乘拟合
Abstract:
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.
- radiometry /
- correlation radiometer /
- sensitivity /
- multiphase modulation /
- least squares fitting

HTML全文

图 1 多相调制相关辐射计结构

Figure 1. Structure of multiphase modulation correlation radiometer

下载: 全尺寸图片幻灯片

图 2 8个样本点时的复相关圆

Figure 2. Complex correlation circle at eight sample points

下载: 全尺寸图片幻灯片

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