Apparatus and methods for resolving integer ambiguities in position determination. An embodiment of the invention includes a reference system, augmented with multi-frequency pseudolites using a carrier phase differential GPS implementation, and a mobile system. In one embodiment, the components of the...http://www.google.de/patents/US6882314?utm_source=gb-gplus-sharePatent US6882314 - Carrier-based differential-position determination using multi-frequency pseudolites
