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Altimeters are active microwave instruments for the accurate measurement of vertical distances (between the spacecraft and the altimeter footprint). The technology determines the two-way delay of the radar pulse echo from the Earth’s surface to a very high precision (to less than a nanosecond). The instrument is also able to measure the power and the shape of the reflected radar pulses. Since the...
The Global Monitoring for Environment and Security (GMES) Space Component relies on a constellation of dedicated space missions (called the Sentinels, scheduled for first launch by 2013), as well as on a set of space missions not dedicated to GMES but contributing to it. In charge of optimizing access and usability of the available space-based remote sensing resources for the pre-operations, the European...
Satellite radar altimetry, which was initially designed for accurate measurements of sea surface height, has been demonstrated to be suitable for land surfaces as well.
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