| 摘要 |
<p>A method and system for providing proof that a GPS (or similar) positioning device obtained in respect of a remote device (102) a position/time/velocity fix at a certain location at a certain time. Satellites (100) transmit continuously varying verification bits, and during a verifiable position fix, the remote device (102) sends a sample of IF data (so containing the verification data) in real time (or very close thereto) to a trusted server (106). A forger of such verification data would need to acquire the verification bits, e.g. by decoding the signals from the satellites, then generate forged data, which would result in an extra few seconds, or a fraction of a second, of delay relative to a genuine position fix, and the server would reject the data as too late. Thus, only a real device (102) in the location claimed can produce this verification data at the time it was received by the server (106).</p> |
