×

Computing network path delays so accurate absolute time can be forwarded from a server to a client

  • US 20030157886A1
  • Filed: 02/19/2002
  • Published: 08/21/2003
  • Est. Priority Date: 02/19/2002
  • Status: Active Grant
First Claim
Patent Images

1. A network-assisted navigation satellite receiver system, comprising:

  • a network server with a first navigation satellite receiver for computing accurate, absolute time;

    a network client with a second navigation satellite receiver and operating according to a relative time;

    an interconnecting network for communicating information related to said accurate, absolute time from the network server to the network client, and that imposes a non-deterministic time delay on messages;

    a message latency testing means for determining the fastest transit times of messages from the network server to the network client (L1), and for determining the fastest transit times of return messages from the network client to the network server (L2); and

    an offset calculator for computing said offset time from the average of the fastest transit times L1 and L2;

    wherein, a solution at the network client by the offset calculator of said offset time added to said accurate, absolute time, provides for improved receiver initialization.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×