Paper Info
Title
Analysis Of System Linearity Caused By Gain Variation For Microsat-Based Microwave Radiometer
Abstract
Compared to existing polar-orbiting satellites, the small satellite constellation is of low-cost, rapidly deployable and mission-flexible. Meanwhile, a series of challenges are followed in aspects of size, weight, life, stability, detecting accuracy, consistency of multi-satellite and so on. This paper mainly focuses on the characteristic of diode detector for Microsat microwave radiometer. Given the certain observation target, the retrieved brightness temperatures would have changed correspondingly under different system AGC (Automatic Gain control) values. By adjusting the system gain, a little change happened but still in normal workspace. The variation caused by nonlinearity of diode, by using two-point calibration method, cannot be completely eliminated Setting a wide range of 3-350K, the experimental results demonstrate that there is obvious nonlinearity for brightness temperatures between retrievals minus actual values and observations. So, in the procedure of real-time calibration for Microsat microwave radiometer, the system must be assured working in approximately linear workplace with a certain and reasonable AGC value.
Year
DOI
Venue
2020
10.1109/IGARSS39084.2020.9323910
IGARSS 2020 - 2020 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM
Keywords
DocType
Citations 
Microsat microwave radiometer, detector, AGC, nonlinearity, linear workplace
Conference
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Jieying He1109.68
Shengwei Zhang200.68