Title

Comparative Study Of High Voltage Igbts With Enhanced Conductivity Modulation

Abstract

The Microwave Radiometer (MWR) on the Aquarius/SAC-D mission measures microwave radiation from earth and intervening atmosphere in terms of brightness temperature (T b). It takes measurements in a push-broom fashion at K- (23.8 GHz) and Ka-band (36.5 GHz) frequencies using two separate reflector antenna systems, each producing eight spot beams. Pre-launch measurements of the alignment of these beams with respect to the spacecraft coordinate system is used to geolocate the antenna foot-prints on ground. As a part of MWR's on-orbit engineering check-out, the verification of MWR's pointing accuracy is discussed here. The technique used to assess MWR's pointing involves comparing the radiometer image of land with high-resolution maps. When the beam's instantaneous field of view (IFOV) passes over a land/water boundary, the brightness temperature changes from a radiometrically "hot" land-scene to a "cold" ocean-scene. This "step-function" change in brightness temperature provides a very sensitive way to assess the mispointing error of the calculated MWR earth location (latitude/longitude) of the antenna footprints. This paper describes the algorithm used for the MWR geolocation validation assessment and preliminary results, presented for the MWR 23.8 GHz channel, show that the mispointing errors from the true coastline are close to meeting the specification. © 2012 IEEE.

Publication Date

5-31-2012

Publication Title

Conference Proceedings - IEEE SOUTHEASTCON

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/SECon.2012.6196955

Socpus ID

84861512857 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84861512857

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