| 摘要 |
Positioning apparatus (10) for use in a moving vehicle includes circuitry arranged to process signals received from GPS satellites, and to provide signals in response thereto from which the position of the apparatus (10) can be calculated at a remote station (Figure 2). The apparatus (10) provides, for each satellite in view, carrier frequency estimation signals, samples of the carrier signals and code stacking signals to a data transmission device (14), which modulates the signals onto a carrier prior to transmission to the remote station. A carrier loop reconstruction device and location processor in the remote station co-operate to determine the location of the positioning apparatus. A memory device (32) at the remote station may record the signals received from the vehicle over a period of time, for subsequent carrier loop reconstruction and location determination.
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