Altimetry method and system

Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter

Reexamination Certificate

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C342S089000, C342S118000, C342S175000, C342S190000, C342S191000, C342S195000, C342S350000, C342S351000, C342S352000, C342S450000, C342S462000, C375S130000

Reexamination Certificate

active

08059025

ABSTRACT:
An altimetry method comprising: providing a signal receiver (RX) on a first platform (S1) flying above a portion of the Earth surface (ES), for receiving a temporal series of signals emitted by a second flying platform (S2) and scattered by said portion of the Earth surface; and computing altimetry waveforms, indicative of an elevation profile of said portion of the Earth surface, by processing the received signals; characterized in that said step of computing altimetry waveforms comprises: cross-correlating the received signals with a plurality of locally-generated frequency-shifted replicas of the emitted signals; introducing a frequency-dependent temporal shift to the correlation waveforms in order to compensate for range delay curvature; and incoherently summing the temporally shifted correlation waveforms (CXC) corresponding to signals scattered by a same region of the Earth surface at different times during motion of said first platform.

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