ashtech Reliance FS/2, Operation Manual

Page: 18 / 186

2 Reliance with FS/2 Field Operations Manual
Hardware
The hardware components of the Reliance system include:
• SCA-12™ GPS receiver
• FS/2™ handheld controller
• Backpack
• GPS Survey antenna and 50 cm antenna pole
• Two 12-Volt DC camcorder batteries
• Two battery chargers
• Battery cable
• 12 VDC automobile adapter cable
• RS-232 serial interface cable
• Port A-to-FS/2 cable
• FS/2-to-PC cable
The receiver (Figure 1.1) provides real-time positions, velocity, heading, and time
measurements using twelve dedicated separate and parallel channels for Coarse/
Acquisition (C/A) code-phase and carrier-phase measurement on the L1 (1575 Mhz)
band. The receiver receives satellite signals via an L-band antenna and low-noise
amplifier (LNA). The SCA has an L1-band radio frequency (RF) port and three RS-
232 serial input/output (I/O) ports. All three serial ports are capable of two-way
communication with external equipment.
The receiver stores the GPS satellite measurement data along with the features logged
in the field. Its 4.5 megabytes of memory allows for more than 27 hours of code and
carrier data recording at a 5.0-second recording interval.
Figure 1.1: SCA-12 GPS Receiver