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Navigation with satellite communications

  • US 7,535,402 B1
  • Filed: 04/18/2005
  • Issued: 05/19/2009
  • Est. Priority Date: 04/19/2004
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a reference station network operable to determine navigation measurements from a plurality of reference stations in the network, cycle ambiguities associated with multiple ones of the reference stations of the network; and

    a low earth orbit satellite operable to broadcast the navigation measurements from the plurality of reference stations in the network over a satellite beam to a plurality of users, the broadcast being over a footprint of the beam;

    wherein the reference stations comprise differential navigation reference stations in the network;

    wherein the low earth orbit satellite also is operable to broadcast with the satellite navigation measurements from the differential navigation reference stations, the network being operable to reduce a data bandwidth over the satellite link;

    wherein the data bandwidth reduction is achieved by excluding redundant information by at least one of the reference stations, which monitor the measurements from other reference stations; and

    wherein integrity of operation of the reference stations is monitored.

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