Trimble Outdoors SPSX51 - Manual (Page 38)

4 Setup Guidelines
36 SPSx51 Modular GPS Receivers User Guide
reference station system. The connection is provided by an integrated radio, a cellular
modem in the controller, or through an external cellular phone that is connected to
the receiver either by Bluetooth wireless technology or by means of a cable.
The correction stream for some other positioning solutions, such as SBAS
(WAAS/EGNOS/MSAS) and the OmniSTAR service
1
, is broadcast through
geostationary satellites, and detected by the GPS antenna itself. No integrated radio or
base station is required.
Rover receiver components
The rover receiver has the following components:
• GPS receiver
• GPS antenna
• Optional integrated radio receiver and antenna for RTK operations
• Optional items for the different mounting options (see below)
In most rover applications, the receiver operates entirely from its own integrated
battery unit. On a vehicle or on a marine vessel, however, an external power supply can
be used. Use an external power supply if one is provided. The internal battery then acts
as a uninterruptible power supply, covering any external power failures.
Choose a rover receiver according to the needs of the job:
• A Smart GPS antenna, such as the SPSx81, incorporates the GPS receiver, GPS
antenna, power supply, and receive radio into a single compact unit. A Smart
GPS antenna can be rapidly set up on a pole, vehicle, or backpack. This makes it
easy to carry when you are measuring around the jobsite.
• A Modular GPS receiver, such as the SPSx51, incorporates the GPS receiver,
receive radio, and power supply into a single unit. The GPS antenna and,
optionally, the receive radio antenna, is separate from the receiver. When you
use a modular GPS receiver as a rover, you can use optimized components
placed in the best locations for your application. For example:
– A small, lightweight rover antenna can be mounted on a pole or backpack;
placed in a high, inaccessible location on a marine vessel mast or cabin; or
placed on a site vehicle roof or truck bed.
– A rubber duck radio antenna, or an external radio antenna, can be
mounted on a vehicle or vessel roof to provide maximum coverage.
A Modular GPS receiver can be placed in a location that is both easily accessible
and safe from theft and the weather. The antennas can be placed high on a
vehicle or vessel roof, clear of obstructions and able to deliver maximum
performance.
1. OmniSTAR is available only with the SPSx51 Modular GPS receivers.