| 摘要 |
An apparatus for calculating the position of a receiver in dependence on the time it takes signalling events to travel from a plurality of satellites to the receiver, the apparatus being arranged to, in respect of each satellite: obtain an indication of a transit time for a signalling event to travel from the satellite to the receiver, the indication of the transit time incorporating an integer ambiguity; and form an indication of an expected transit time for a signalling event to travel from the satellite to the receiver; the apparatus being further arranged to: designate one of the plurality of satellites as a reference satellite; compare the obtained indication of the transit time and the indication of the expected transit time for each non-reference satellite with the obtained indication of the transit time and the indication of the expected transit time for the reference satellite to form residuals that are representative of a combined error in those indications of expected transit time; and calculate the position of the receiver, without calculating the integer ambiguities in the obtained transit times, in dependence on the residuals. |
