Topcon HiPer+ - Receiver Overview

Introduction
HiPer+ Operator’s Manual
1-6
Receiver Overview
When power is turned on and the receiver self-test completes, the
receiver’s 20 channels initialize and begin tracking visible GPS and
GLONASS satellites. Each of the receiver’s channels can be used to
track C/A-L1, P-L1, or P-L2 signals. The number of channels
available allows the receiver to track simultaneously all visible GPS
and GLONASS satellites at any time and location. The combination
GPS and GLONASS (GPS+) antenna receives the different signals
for processing.
An internal GPS+ antenna equipped with an optional low noise
amplifier (LNA) and the receiver’s radio frequency (RF) device are
connected with a coaxial cable. The wide-band signal received is
down-converted, filtered, digitized, and assigned to different
channels. The receiver processor controls the process of signal
tracking.
Once the signal is locked in the channel, it is demodulated and
necessary signal parameters (carrier and code phases) are measured.
Also, broadcast navigation data are retrieved from the navigation
frame.
After the receiver locks on to four or more satellites, it is possible to
solve the so-called “absolute positioning problem” and compute the
receiver’s coordinates (in WGS-84) and the time offset between the
receiver clock and GPS time. All this information can be stored in the
the memory and downloaded later onto a computer, then processed
using a post-processing software package. When the receiver is run in
RTK mode, raw data measurements can also be recorded into the
receiver’s internal memory. This allows the operator to double check
real-time results obtained in the field.
Depending on purchased options, capabilities of the receiver include
the following:
• Co-Op Tracking
• Multipath reduction
• Wide area augmentation system (WAAS)
• Adjustable phase locked loop (PLL) and delay lock loop (DLL)
parameters