Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1995-01-13
1996-06-25
Johnson, Stephen M.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
340904, 340936, G01S 1352
Patent
active
055304478
ABSTRACT:
A method and system for discriminating a target which presents a hazard to a motor vehicle moving in a first lane of traffic from a target moving in a second adjacent lane of traffic which does not present a hazard to the vehicle. The method includes the steps of utilizing an antenna mounted flush to a side of the vehicle to produce a radar beam having a beamwidth greater than 5-10 degrees to illuminate the target. At least a portion of the radar beam is produced along a first axis which is perpendicular to the direction of motion of the vehicle. The reflected signal is received from the illuminated target and a velocity of the illuminated target is estimated with a Kalman filter relative to the velocity of the vehicle in the direction of a second axis which is parallel to the direction of motion of the vehicle based on the reflected signal. The method also includes the steps of measuring the velocity of the vehicle using at least one velocity sensor and determining that the illuminated target is hazardous if the sum of the measured vehicle velocity and the estimated parallel target velocity is greater than a predetermined threshold. The illuminated target is determined not to be hazardous if the sum of the measured vehicle velocity and the estimated parallel target velocity is less than a predetermined threshold.
REFERENCES:
patent: 4072945 (1978-02-01), Katsumata et al.
patent: 4097864 (1978-06-01), Endo et al.
patent: 5325097 (1994-06-01), Zhang et al.
patent: 5339075 (1994-08-01), Abgt et al.
Henderson Mark F.
May Phillip A.
Reed John C.
Zhang Zhaohong
Delco Electronics Corp.
Johnson Stephen M.
Navarre Mark A.
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