In the frame of an SMOS follow-on operational mission, a new instrument design is being developed based on the lessons learned from MIRAS, the SMOS payload. To reduce hardware complexity and mass, digital In-phase Quadrature (IQ) demodulation is considered. In this schema, Q components are obtained by delaying one clock of the digitized IF signals instead of using phase quadrature analog mixers. The purpose of this article is to formulate this concept for application to interferometric radiometry, establish the required data processing methods, and provide experimental results.
R.Lucasgraduated in Telecornmunications Engineering, M.A.Mart:nez graduat,ed in Aeronautics Engineering, with ESA since 1986. with GMV since 1988. M.Neira graduated in Telecollilnunicatiorls Engineering, with GMV since 1989.
AbstractA method for real-time attitude deterniination of a very short baseline based on triple-difference phase measurements has been evaluated experiment ally using two commercial off-the-shelf GPS C/A code receivers delivering integrated doppler measurements. The algorithm is robust with respect to phase cycle slips and does not require the usual integer ambiguity of the measurements to be solved. T h e preliminary results show that absolute attitude determination requires a calibration of the baseline and that the relative attitude accuracy is in tlie order of 0.1 degrees or 2 mrads for the case of a 2 ni long baseline.
Two field experiments named WISE (WInd and Salinity Experiment) were sponsored by the European Space Agency (ESA) to better understand the wind and sea state effects on the L-band brightness temperatures. They took place at the Casablanca oil rig located in the North Mediterranean Sea, 40 km off shore the Ebro river deltaSpanish National funds, a third field experiment named FROG (Foam, Rain, Oil slicks and GPS reflectometry) took place at the Ebro river delta, to measure the phenomena that were not completely understood during the WISE field experiments, mainly the effect of foam and rain. In order to achieve the objectives of the WISE field experiments the LAURA L-band fully polarimetric radiometer from the Technical University of Catalonia (UPC) was mounted on the Casablanca oil-rig at the 32 meters deck above the sea surface, pointing to the North and North-West, in the direction of the dominant winds. In this paper we present the results of the first study to determine the relationship between the brightness temperature and the sea state.
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