Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance
Reexamination Certificate
2006-05-30
2006-05-30
Lobo, Ian (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance
C342S125000, C342S135000, C342S137000
Reexamination Certificate
active
07053818
ABSTRACT:
A method for measuring distance and relative speed between two points, one of which is stationary. The method employs a radio signal modulating a periodic pulse train sent from stationary point to a movable point and simultaneously being retransmitted back to the stationary point with both the transmission and the retransmission occurring during exactly the same period of time. The number of pulses sent from the stationary point during that period of time is known. The number of pulses received by the stationary point during the transmission period, being less than all of the pulses sent to the movable point is used to determine the distance. The process is repeated after a precise time period of no transmissions and a new distance is between the points is determined. Knowing the change in distance and the precise time period over which the change occurred, permits a determination of relative speed of the two points.
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patent: 4249176 (1981-02-01), Oishi et al.
patent: 4620788 (1986-11-01), Giger
patent: 5095312 (1992-03-01), Jehle et al.
patent: 5194869 (1993-03-01), Kochiyama et al.
patent: 6111536 (2000-08-01), Richards et al.
patent: 2004/0119633 (2004-06-01), Oswald et al.
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