Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance
Patent
1998-02-25
1999-10-05
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance
342111, 342112, 342116, 342127, 342129, G01S 1342
Patent
active
059631635
ABSTRACT:
In a method and device for frequency-modulated continuous-wave radar detection with removal of ambiguity between the distance and the speed, the radar sends out at least alternately two parallel and discontinuous frequency modulation ramps that are slightly offset by a frequency variation (.DELTA.F), the frequency switching from one ramp to the other at the end of a given duration (Tf), the distance from a detected target being estimated as a function of the difference in phase (.DELTA..phi.) between a received signal (S.sub.1 (t)) corresponding to the first ramp and a received signal (S.sub.2 (t)) corresponding to the second ramp, the speed of the target being obtained from the estimated distance and the ambiguity straight line associated with the target. The disclosed method and device can be applied especially to radars for automobiles.
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Kemkemian Stephane
Lacomme Philippe
"Thomson-CSF"
Sotomayor John B.
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