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The microwave radiometer on board ERS-I developed at CRPE has two channels at 23·8 and 36·5GHz. It is a nadir pointing sensor, aimed at the correction of the altimeter tropospheric path delay. It also provides the precipitable water and cloud liquid water over oceans along the satellite track. However, the measured brightness temperatures can be used to characterize polar ice and land surface properties. This paper summarises the characteristics of the instrument, describes the scientific requirements for data processing and presents its first results after launch.

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