ON THE GPS WIDELANE AND ITS DECORRELATING PROPERTY

In this contribution we consider the popular widelaning technique from the viewpoint of ambiguity decorrelation. It enables us to cast the t echnique into the framework of the least-squares ambiguity decorrelati on adjustment (LAMBDA) and to analyse its relative merits. In doing so , we will provide answers to the following three questions. Does the w idelane decorrelate? Does it explicitly appear in the automated transf ormation step of the LAMBDA method? Can one do better than the widelan e? It is shown that all three questions can be answered in the affirma tive. This holds true for the ionosphere-fixed case, the ionosphere-fl oat case, as well as for the ionosphere-weighted case.