Method of measuring distance, notably for short-range radar
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United States of America Patent
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Feb 14, 2012
Grant Date -
Aug 4, 2011
app pub date -
Feb 2, 2010
filing date -
Feb 2, 2010
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Abstract
The present invention relates to a procedure for measuring distance. It applies notably in respect of short-range radars, but not exclusively. The method uses an electromagnetic wave comprising at least one emission sequence (31, 32, 33, 34, 35) of the FSK type, at least two emission frequencies (F.sub.1, F.sub.2), emitted successively towards the said target a given number p of times inside the sequence. The gap .delta.F between the emission frequencies (F.sub.1, F.sub.2) is substantially equal to an integer number k of times the repetition frequency (SPRF) of the cycle of frequencies, the distance measurement being obtained on the basis of the measurement of difference of phases .DELTA..phi. between the signals received corresponding respectively to a first frequency (F.sub.1) and to a second frequency (F.sub.2).
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