JMR Noise Diode Stability and Recalibration Methodology after Three Years On-Orbit

Author

Brown, Shannon ; Desai, Shailen ; Keihm, Stephen ; Ruf, Christopher

Author_Institution

Jet Propulsion Lab., Pasadena, CA

fYear

2006

fDate

2006

Firstpage

7

Lastpage

12

Abstract

Long term drifts and shifts in the Jason Microwave Radiometer (JMR) geophysical retrievals, relative to ground truth, have been attributed to long term changes in the JMR noise diode (ND) brightness, which is used for gain calibration. An optimal estimation based calibration system is developed to find an optimal set of calibration coefficients which minimize the root-mean-square (RMS) difference between the JMR brightness temperatures (T_Bs) and on-Earth references. This calibration system is used to derive a time series of the ND brightness. Changes in the ND brightness, on the order of 1-2%, are observed over the first three years of the mission. Results of the recalibration effort and validation of the retrieved ND time series are presented

Keywords

calibration; geophysical techniques; microwave diodes; radiometers; time series; JMR brightness temperatures; JMR noise diode recalibration; JMR noise diode stability; Jason Microwave Radiometer geophysical retrievals; gain calibration; noise diode brightness time series; on-Earth references; optimal estimation based calibration system; root-mean-square difference minimization; Brightness temperature; Calibration; Delay; Diodes; Geophysical measurements; Loaded antennas; Microwave radiometry; Neodymium; Stability; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

IEEE MicroRad, 2006

Conference_Location

SanJuan

Print_ISBN

0-7803-9417-8

Type

conf

DOI

10.1109/MICRAD.2006.1677053

Filename

1677053