| 摘要 |
A differential carrier phase GPS navigational device comprises an integer estimator [32] adapted to estimate an integer that resolves an integer cycle ambiguity, a reference phase predictor [30] adapted to predict a present reference phase value from reference phase information received by a data link receiver [22], and a position calculator [28] for computing a present vehicle position from the estimated integer, the predicted present reference phase value, and GPS signals received at a vehicle GPS receiver [20]. The reference phase predictor [30] comprises electronic circuitry adapted to determine a polynomial function which fits the reference phase information, and to evaluate the polynomial function to determine the predicted reference phase value. Because the position calculator uses a reference phase value that is not delayed, the navigational device is able to provide a vehicle position that corresponds to the present time.
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