Leica GPS1200+, Technical Reference Manual, Page: 1212 / 1442

Survey - General 1212
45.6 Initialisation for Real-Time Rover Operations
45.6.1 Terminology
Description This chapter describes technical terms related to initialisation.
Initialisation For cm positioning with GPS, the ambiguities need to be fixed. The process of fixing ambi-
guities is called initialisation. In order to carry out an initialisation, the active configuration set
must be a real-time rover configuration allowing for phase fixed solutions. A minimum of five
satellites on L1 and L2 is required.
The three existing types of initialisation methods are:
Description of initialisation methods
• Moving • Static • On a known point
Initialisation
method Characteristic Description
Moving Principle The rover receiver is moved from the beginning of
the GPS operation on, recording data. The trajectory
of the moving rover is recorded. Ambiguities are
fixed while moving. A new initialisation starts auto-
matically when, after losing the minimum number of
required satellites, enough satellites are tracked
again.
Antenna setup On a pole.