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System for locating and communicating with mobile vehicles

  • US 5,432,841 A
  • Filed: 07/10/1992
  • Issued: 07/11/1995
  • Est. Priority Date: 07/10/1992
  • Status: Expired due to Term
First Claim
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1. A vehicle location system for tracking geographical position of a cellular subscriber station free of establishing a telephone connection with the cellular subscriber station, wherein the system tracks the geographical position over a wide geographical area that includes a plurality of cellular telephone systems connected by a roaming network, wherein each of the cellular telephone systems includes a memory for holding data that (1) identifies cellular subscriber stations based in that cellular telephone system, (2) identifies visiting cellular subscriber stations based in other cellular telephone systems and (3) identifies that particular cellular telephone system, and wherein the roaming network includes means for transferring the data in the memory between the cellular telephone systems connected by the roaming network, wherein each cellular telephone system also includes means for accessing the data to, at least one of, (1) establish a telephone connection and (2) maintain a telephone connection with cellular subscriber stations based in that cellular telephone system that are visiting other cellular telephone systems connected by the roaming network, the vehicle location system comprising:

  • an interface connected to the memory of at least one of the plurality of cellular telephone systems connected by the roaming network and including means for accessing the data relating to the cellular subscriber station, and means for reading the data identifying the cellular telephone system in which the cellular subscriber station is currently present; and

    means, interconnected with the interface, for translating the data relating to the cellular subscriber station into location data indicative of the geographical position of the cellular subscriber station based upon the geographical position of the cellular telephone system in which the cellular subscriber station is present.

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