Guidance method and system for an automotive vehicle

Details Guidance method and system for an automotive vehicle Guidance method and system for an automotive vehicle

1982-03-10

1984-07-10

Gruber, Felix D.

Boots, shoes, and leggings

343389, 343457, 364449, 364450, 364452, G06F 1550

Patent

active

044596677

ABSTRACT:
A guidance method and system for an automotive vehicle which switches from an electronic navigational signal method to a dead reckoning method when any of the field strengths of three navigational electromagnetic wave signals drops below a predetermined lower limit or vice versa when the field strengths of the three navigational electromagnetic wave signals all exceed the lower limit. Therefore, even if the navigational wave signals are obstructed by buildings or mountains, it is possible to continuously determine and display the vehicle position. The guidance system according to the present invention comprises a receive-state detection unit for detecting three field strengths and for comparing the detected field strengths with a predetermined lower limit, and a selector for selectively outputting vehicle position signals on the basis of navigational signals or dead reckoning, in addition to the conventional electronic navigation system and dead reckoning system.

REFERENCES:
patent: 3630079 (1971-12-01), Hughes et al.
patent: 3919529 (1975-11-01), Baker et al.
patent: 3941984 (1976-03-01), Chappell et al.
patent: 4107689 (1978-08-01), Jellinek
patent: 4114437 (1978-09-01), Krogmann
patent: 4318105 (1982-03-01), Brodeur
patent: 4359733 (1982-11-01), O'Neill
patent: 4416017 (1983-11-01), Jasper et al.
Lezniak et al., "A Dead Reckoning/Map Correlation System for Automatic Vehicle Tracking," IEEE Transactions on Vehicular Technology, vol. VT-26, No. 1, Feb. 1977.

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