| 摘要 |
A global navigation satellite system has at least one reference receiver station (R) having a fixed geographical location, a user's receiver station (U) having position coordinates that are to be determined and a constellation of global navigation satellites (S) of which at least a plurality are always within view of the receiver sations (R, U). The user's receiver station (U) comprises means (10) for measuring code-phase data and carrier-phase data derived from the satellites (S), means (12) for receiving code-phase data and carrier-phase data from the reference receiver station (R), means (11) for deriving from the received and measured data first double-differenced carrier-phase measurements, a respective plurality of integer ambiguity estimates for each said first double-differenced carrier-phase measurement and second double-differenced carrier-phase measurements corresponding to said first double-differenced carrier-phase measurements, a first processor (14, 15) for processing said plurality of double-differenced integer ambiguity estimates to derive a single integer ambiguity value for each said first, and the corresponding second double-differenced carrier-phase measurement, and a second processor (16) for using said second double-differenced carrier-phase measurements and said integer ambiguity values to evaluate an estimate of said position coordinates P1<r>. |
