Leica GPS1200+, Technical Reference Manual

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Config...\Interfaces... - Controlling Devices 596
24 Config...\Interfaces... - Controlling Devices
24.1 Digital Cellular Phones
24.1.1 Overview
Description For digital cellular phones, information such as
• the reference stations that can be contacted
• the phone numbers of the reference stations and
• the type of protocol to be used
can be defined.
Changing the reference station to be dialled is of interest in two cases.
Technologies
Case 1: Two real-time reference stations, each equipped with a digital cellular phone,
are set up at two locations belonging to different network providers.
When leaving the area of one reference, the station can be changed and the
other reference can be called.
Case 2: Set up as in case 1.
Two separate fixes from each reference for each point can be obtained,
providing redundancy for future least squares adjustment operations.
CDMA C ode D ivision M ultiple A ccess is a high speed data transmission for very
effective and flexible use of available ressources such as band width. Users
of a cellular phone network occupy the same frequency band. The signal is
especially coded for each user.