Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1995-01-24
1996-10-08
Carone, Michael J.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342 94, 342 96, G01S 1366, G01S 1393
Patent
active
055636020
ABSTRACT:
In an FMCW radar system, the velocity of obstacles relative to the radar couples a Doppler frequency shift into the return signal which causes an error in the range measurement. It is known to use a radar signal having a frequency ramp that both increases and decreases to distinguish the range of an obstacle from its velocity but when multiple obstacles are present this is not practical. By using a measure of velocity from a succesion of return signals, which of the radar output signals from the upsweep and downsweep of the radar signal that relate to a particular obstacle can be identified so that the range and velocity can be determined accurately. The FMCW radar system may be provided with a frequency scanned antenna, the beamwidth determined by the processing circuitry is variable according to the size of the obstacle being detected or the range at which the radar is searching for obstacles. Instead of scanning the beam of the radar, the variation in frequency can be made to alter the beamwidth of the radar so that, for example, a car radar will detect only vehicles in the lane ahead of the car, regardless of the range of the vehicles.
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Sklnik, "Introduction to Radar Systems", published by McGraw Hill, NY, pp. 298-301.
Carone Michael J.
Kraus Robert J.
Montgomery Christopher K.
U.S. Philips Corporation
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