Journal of Global Positioning Systems (2004) Vol. 3, No. 1-2: 290-295
Abstract:
Because of the integer-valued nature of carrier
phase ambiguities, it is essential to fix the float estimates
into integer values in order for high precision DGPS
positioning. A decorrelation process is necessary to solve
the problem since double-differenced ambiguities are
highly correlated in general. In this paper, Block
Decorrelation Method (BDM) is presented and tested for
its convergence. BDM divides the variance-covariance
matrix into four blocks and decorrelates them
simultaneously. A number of randomly selected examples
show that BDM is comparable to the existing
decorrelation algorithm, however its speed of
convergence is relatively faster due to the computations
performed on small blocks
