R&S M3SR 4100 Series, Operating Manual

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Operating Manual 6175.4760.02 – 01 5.7
M3SR Series 4100 Types of GPS Transmission
5.2.1.2 Types of GPS Transmission
Pull Request and Response
A GPS (Global Positioning System) pull request is issued by a GPS controller in order to re-
quest the transmission of current GPS positioning information from other GPS participants.
Addressed providers and other controllers with CRP (Controller Reports Position) enabled
having received the request do respond by transmitting their current GPS position (if avail-
able). If an addressed GPS participant has currently no GPS satellite visibility, it will respond
by transmitting empty GPS positioning information. If a participant has never received the
GPS signal (required for scheduled transmissions), it will not respond to a standard (sched-
uled) pull request since in this case it can only support unscheduled / immediate pull actions
(see sect. 5.2.1.4 General Requirements and Valid Combinations of GPS Reporting Fea-
tures and ”Immediate (Unscheduled) Transmission” on p. 5.9).
Push
Manual Push
GPS participants can manually push their current GPS position onto the network. A manual
push can be initiated via an MMI (Man-Machine Interface) pushbutton or via the REMOTE
interface (for radios only).
If a GPS participant has currently only limited or no GPS satellite visibility, it will push empty
GPS positioning information onto the network. If a GPS participant has never received the
GPS signal (required for scheduled transmissions), it can only support immediate push ac-
tions (see sect. 5.2.1.4 General Requirements and Valid Combinations of GPS Reporting
Features).
Received pull and push data are internally stored by the receiving radios (participating in
GPS reporting) in a list and can be accessed in different formats via the MMI and REMOTE
interfaces.
Automatic Push
Tactical radio GPS participants can automatically push their current GPS position onto the
network.
Periodic (Timer Initiated) Transmission of GPS Information
An auto push time interval [in seconds] can be pre-configured statically via R&S RNMS3000
or dynamically by receiving an Auto Push Configuration Request (APR) from a GPS control-
ler.
Selected / addressed provider radios and controller radios with CRP enabled start to period-
ically transmit their current GPS position using the configured time interval. For this to func-
tion, network and GPS time synchronization must have been received. The time interval can
only be set an integer multiple of the scheduling round time (see ”Standard (Scheduled)
Transmission” on p. 5.8).