Location systems
First Claim
1. A vehicle location apparatus for providing data concerning the position of a vehicle when said vehicle is travelling over a predetermined network of routes comprising distance log means for producing information signals relating to the distance travelled by said vehicle, turn detector means for producing information signals relating to changes in the direction of travel of said vehicle, junction identity means for storing signals relating to the identity of a given junction as determined by the appropriate turn characteristics of the junction preceding it, and distance from junction store means for storing signals relating to the distance between junctions, said junction identity means including means for computing the next junction toward which said vehicle is headed on said network.
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Accused Products
Abstract
A vehicle location system for vehicles travelling over a predetermined route in which equipment in the vehicle derives information concerning the distance travelled from predetermined junctions and the turns made and computing means within the vehicle computes the route between road junctions on which the vehicle is travelling. Each vehicle carries transmitter means for transmitting computed location information to a base station when interrogated by the same.
24 Citations
12 Claims
- 1. A vehicle location apparatus for providing data concerning the position of a vehicle when said vehicle is travelling over a predetermined network of routes comprising distance log means for producing information signals relating to the distance travelled by said vehicle, turn detector means for producing information signals relating to changes in the direction of travel of said vehicle, junction identity means for storing signals relating to the identity of a given junction as determined by the appropriate turn characteristics of the junction preceding it, and distance from junction store means for storing signals relating to the distance between junctions, said junction identity means including means for computing the next junction toward which said vehicle is headed on said network.
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10. A vehicle location apparatus for providing data concerning the position of a vehicle when said vehicle is travelling over a predetermined network of routes which defines a number of junctions, comprising in combination:
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a bank of storage devices containing data indicating the known distances between adjacent junctions of said network; temporary storage means for temporarily storing data from one of said storage devices at a time; gate means connecting said bank of storage devices to said temporary storage means to permit the temporary storing of data in the latter; means slaved to the vehicle and connected with said temporary storage means for causing the latter to produce an enabling signal when the distance travelled by the vehicle matches that stored in said temporary storage means; vehicle turn indicating means producing output signals indicating change of direction, if any, of the vehicle; programmed junction identity means connected to said output signals of the turn indicating means for computing the next junction of said network toward which the vehicle is heading and having a plurality of output lines controlling said gate means to cause said temporary storage means to store the information indicating the distance to said next junction; and said enabling signal controlling the application of said output signals of the turn indicating means whereby said junction identity means computes the identity of said next junction only upon arrival of the vehicle at that junction toward which it was originally heading. - View Dependent Claims (11, 12)
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Specification