Fast Positioning Using the Lambda-method

Ambiguity resolution is essential for precise GPS diffe rential positioning. At the IAG General Meeting in Beijing 1993 [1], a new method for fast integer ambiguity estimation has been introduced. Some aspects of the theory have been reviewed at the DSNS 94 conference [2]. The LAMBDA-method, which stands for Least-squares AMBiguity Decorrelation Adj ustment, first decorrelates the ambiguities and next co mputes integer least-squares estimates for the ambiguities in a highly efficient way. In this paper fast high precision positioning results are presented. For baselines up to 10 km the LAMBDAmethod is able to come up with the correct integer estimates at a high success rate using only one epoch of data. These results show that the LAMBDA-method enables instantaneous ambiguity resolution and is therefore very well suited for real-time precise navigation.