1 Introduction
8 Epoch 25 L1/L2 GPS System User Guide
1.1 About the Epoch 25 L1/L2 GPS system
The Epoch 25 GPS receiver uses an external GPS antenna and is designed for GPS
surveying applications.
The base consists of a receiver, external PacificCrest PDL HPB radio, and external
battery. For information on the PDL HPB radio and the external battery please refer to
the documentation included with the radio kit.
The rover consists of a receiver, internal radio with receive option, and an internal
battery in a rugged lightweight unit.
Three LEDs on the receiver allow you to monitor the satellite tracking, radio reception,
file status, and power. Bluetooth
®
technology on the external wireless device enables
cable-free communications between receiver and controller.
The receiver provides 24 channels L1 C/A code, L1/L2 full-cycle carrier,
WAAS/EGNOS, and L1/L2 full-cycle carrier satellite tracking and supports logging of
raw GPS observables to the handheld controller.
1.2 Features
The receiver provides the following features:
• Unfiltered, unsmoothed pseudo range measurements data for low noise, low
multipath error, low time domain correlation, and high dynamic response
• Very low noise L1 and L2 carrier phase measurements with 1 mm precision in a
1 Hz bandwidth
• Low-elevation satellite-tracking technology
• 24 channels L1 C/A code, L1/L2 full-cycle carrier, WAAS/EGNOS
• Highly accurate GPS L1/L2 technology
• RTCM SC-104 input and output
• CMR+
™
input and output
• GPS antenna cable connector
• Radio antenna connector
• Internal rover radio with a receive option
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