Method of reducing ambiguities in synthetic aperture radar, and radar implementing the method
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United States of America Patent
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Sep 29, 1998
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N/A
app pub date -
Jun 14, 1996
filing date -
Jun 15, 1995
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Abstract
A method of defocusing range ambiguities in a pulse radar, in particular of the SAR type, the method comprising the following steps: radar pulses are spread on transmission by using a plurality of 'chirp' rules for varying the frequency of the transmitted wave as a function of time; during transmission of successive pulses, chirp rules are alternated between chirps that rise and chirps that fall in the frequency/time plane of the pulse; received echoes are compressed by matched filtering using a correlation operation between the received echo signal and the chirp rule that was applied at the time of transmission of the pulse that gave rise to said echo signal; said method being characterized in that said plurality of rules for varying the frequency of the transmitted wave as a function of time comprise a number M of said rules, with M being an integer greater than or equal to 3.
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