Back to results
US 4,305,077 AGranted
System for measuring current position and/or moving direction of vehicle
OwnerToshihiro Tsumurainventor
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
OwnerToshihiro Tsumurainventor
Estimating the term…
A reference station is provided at a fixed position. The station is adapted to transmit a scanning signal the transmitting direction of which is scanned in succession in different directions, a positional information signal representative of the position of the reference station and an azimuth information signal representative of a particular azimuth. A vehicle moving with respect to the reference station is provided with receivers at three positions spaced apart from each other by given distances, so that when the vehicle moves in the service area of the reference station the signals transmitted by the reference station are received. The current position of the vehicle and the moving direction of the vehicle are operated based on a time or phase difference from receipt of the particular azimuth signal until receipt of the scanning signal by the three receivers, the position of the reference station and the distances between the three receivers provided in the vehicle.
A system for measuring the current position and/or the moving direction of a moving vehicle, comprising:
A system in accordance with any one of the preceding claims, wherein said transmitting means is adapted to transmit said signals by way of an electromagnetic wave, and wherein said receiving means is structured to receive said electromagnetic wave signals.
A system in accordance with any one of the preceding claims, which further comprises display means operatively coupled to said information processing means for displaying at least one of the current position and the moving direction of said moving vehicle.
A system in accordance with any one of the preceding claims, wherein said first transmitting means is structured to transmit said azimuth scanning signal in successively different directions in different phases, whereby the information concerning said time periods is determined based on the phase differences of the azimuth scanning signals as received at said three positions.
A system in accordance with any one of the preceding claims, wherein said third transmitting means is included in said first transmitting means, said first transmitting means is adapted such that said azimuth scanning signal is reversed each time said azimuth scanning signal is directed to said specified azimuth, whereby said information concerning said specified azimuth is contained in said azimuth scanning signal.
A system in accordance with any one of the preceding claims, wherein said information processing means is adapted to execute the steps of
Dependencies are inferred from the claim text.