Introduction
Topcon HiPer+ Operator’s Manual
1-6
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 and time (in
WGS-84). All this information is stored in the receiver’s
memory, which can be downloaded later onto a computer and
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.
Capabilities of the HiPer+ receiver include:
• Co-Op Tracking
• Multipath reduction
• Wide area augmentation system (WAAS)
• Adjustable phase locked loop (PLL) and delay lock loop
(DLL) parameters
• Dual-frequency static, kinematic, real-time kinematic
(RTK), and differential GPS (DGPS) survey modes
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