Analysis of Non-Stationary Radiometer Gain Via Ensemble Detection
- Resource Type
- Conference
- Authors
- Aksoy, Mustafa; Racette, Paul E.; Bradburn, John W.
- Source
- IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium Geoscience and Remote Sensing Symposium, IGARSS 2019 - 2019 IEEE International. :8893-8896 Jul, 2019
- Subject
- Aerospace
Geoscience
Signal Processing and Analysis
Radiometry
Calibration
Antennas
Standards
Temperature measurement
Uncertainty
Antenna measurements
Radiometer
Ensemble Detection
Non-stationarity
- Language
- ISSN
- 2153-7003
Although considered as stationary and Gaussian in general, radiometer gain is usually a fluctuating signal with non-stationary properties. Analyses of such non-stationary features is challenging as the radiometer signal cannot be observed independently. On the other hand, time series of post-gain voltages constitute an ensemble set for the radiometer gain which can be used to characterize the radiometer gain. This paper presents a novel technique called "Ensemble Detection" which can analytically retrieve the standard deviation of stationary Gaussian radiometer gain or find an equivalent stationary Gaussian process which represents the non-stationary radiometer gain under different calibration schemes. It has been found that the equivalent Gaussian process for non-stationary radiometer gain heavily depends on the calibration structure and the observation times of the measurand and the calibration references.