General Information 1
The G12 GPS receiver processes signals from the Global Positioning System
(GPS) satellite constellation to provide real-time position, velocity, and time
measurements. The G12 uses twelve discrete parallel channels for Coarse/
Acquisition (C/A) code-phase (pseudo-range) measurements and carrier phase
measurements on the L1 (1575.42 Mhz) band. The G12 receives satellite signals
through an L-band antenna and an external low-noise amplifier (LNA). The G12 is
designed for stand-alone and differential GPS (DGPS) operation; it can operate
as a base (reference) station or a remote (rover) station, providing or using real-
time differential GPS corrections in RTCM SC-104 format (Version 2.2).
This chapter describes G12 hardware and functionality, describes the RF
interface connector and the power/input/output connector, and lists specifications
and power requirements.
Table 1.1. G12 Specifications
POSITION ACCURACY (DGPS)
Horizontal CEP 40.0 cm
Horizontal (95%) 90.0 cm
Vertical (95%) 160.0 cm
TIME TO FIRST FIX (TTFF)
Re-acquisition 2 seconds
Hot Start 11 seconds
Warm Start 35 seconds
Cold Start 45 seconds
G12RevD.book Page 1 Tuesday, April 2, 2002 4:33 PM
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