Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1993-05-07
1994-08-23
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342 71, 342 84, G01S 1300
Patent
active
053411447
ABSTRACT:
A radar system (30) for determining the range at a future time of a target moving relative to the radar system. The system comprises an R.F. source (56) for providing a signal at a frequency which increases over time from a base frequency f (Hz) at a rate r (Hz/s) for a sweep duration d (s). This signal is transmitted and a signal reflected by the target is mixed (38) with a portion of the transmitted signal to give a signal having a frequency proportional to the range of the target. The R.F. source is arranged to have a sweep rate r equal to the base frequency f divided by a time t (s) which time is the delay until the target will be at the measured range. A predicted range may thus be derived without complex compensation for relative velocity. The system may further provide velocity feedback without requiring extra circuitry.
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Hellner Mark
Kraus Robert J.
U.S. Philips Corporation
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