Title

Inter-Satellite Radiometer Calibrations Between Windsat, Tmi And Amsr

Keywords

Brightness temperature; Inter-satellite comparisons; Microwave radiometer; Radiometric calibration

Abstract

NASA's Global Precipitation Mission will rely on a constellation of cooperative satellites with a variety of microwave radiometers to make global rainfall measurements. Thus, it is crucial to achieve brightness temperature (T b) measurement consistency among the constellation as well as to maintain sustained calibration accuracy over the lifetime of each satellite sensor. In-orbit inter-satellite radiometric calibration techniques provide a long term, group-wise solution; however, since radiometers operate at different frequencies and viewing angles, Tb normalizations are made before making intermediate comparisons of their near-simultaneous measurements. In this paper, we investigate two approaches to perform these normalizations from one satellite's measurements to another. One approach is uses Taylor's series expansion around source frequency to predict T b's of destination frequency. The relationship between T b's and frequencies are derived from simulations using an oceanic radiative transfer model (RTM) over a wide variety of environmental conditions. The other approach uses a multi-variable linear regression built from RTM Tb simulations among all frequency and V- and H-polarizations. These two approaches are applied in comparing external measurements between WindSat (on Coriolis), TMI (on TRMM) and AMSR (on ADEOS-II). Accuracy prediction and error source analysis are discussed along with calibration results. © 2007 IEEE.

Publication Date

12-1-2007

Publication Title

International Geoscience and Remote Sensing Symposium (IGARSS)

Number of Pages

5240-5243

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/IGARSS.2007.4424043

Socpus ID

82355169885 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/82355169885

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