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Differential ground station repeater

  • US 5,852,412 A
  • Filed: 10/30/1995
  • Issued: 12/22/1998
  • Est. Priority Date: 10/30/1995
  • Status: Expired due to Term
First Claim
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1. A differential global position system for use in determining one or more parameters of an object with respect to earth by use of information transmitted to the object from a plurality of satellites which information may contain errors due to path distortions, comprising:

  • a ground receiving station at a first known location and including a receiver to receive the information from the satellites and to produce an output signal indicative of the errors;

    means located proximate the ground receiving station for encoding the output signal in accordance with requirements for data transmission between the ground receiving station and the object;

    a first transmitter located proximate the ground receiving station for broadcasting the encoded output signal to the object; and

    a second transmitter located at a second position remote from the receiving station to receive the broadcast encoded output signal from the first transmitter and to retransmit it to the object.

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