This paper reflects the progress of the GFO altimeter design, first described by Walker et. al. The GFO altimeter uses a linear FM waveform, pulse repetition frequency, pulse compression technique, and alpha-beta tracker design similar to an earlier GEOSAT radar altimeter. The current design takes advantage of advanced RF and digital signal processing technologies to produce an instrument that is both light-weight and reliable. Analysis of the range, waveheight, and backscattering cross section performance indicates that the GFO altimeter will achieve equivalent GEOSAT performance in all areas.
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