Topcon GR-3 User Manual

Specifications
GR-3 Operator’s Manual
A-6
Initialize time 5 seconds to 10 min depending on the base line length and
multipath conditions
Output interval for
CMR/RTCM
1Hz standard; 5, 10, 20Hz optional
Elevation 0 to 90 degrees (independent of data logging)
Solution mode Delay (synchronization)
Extrapolation (not synchronized)
Process interval 1Hz standard; 5, 10, 20Hz optional
Latency Delay mode – 20 msec to 20 sec (depends on latency
which receives corrections data from base receiver)
Extrapolation – 20 to 30 msec
Raw Data logging The receiver can record raw data at another interval during
RTK
operation
Status Fix, Float, DOP, Data Link Status, Modem Latency,
Common satellites, Percentage of fixing
Results RTK coordinates, HRMS, VRMS, Covariance Matrix
Ambiguity fixing
level
Selectable thresholds
Low: 95%; Medium: 99.5%; High: 99.9%
Survey Modes
Base or Rover Static
Kinematic (Stop and Go)
RTK (Real-time Kinematic)
DGPS (Differential GPS)
WASS/EGNOS DGPS
Survey Accuracy
Static, Fast Static For L1+L2 – H: 3mm + 0.5ppm (x baseline length);
V: 5mm + 0.5ppm (x baseline length)
Kinematic, RTK
For L1+ L2, L1 – H: 10mm + 1.0ppm (x baseline length)
;
V: 15mm + 1.0ppm (x baseline length)
DGPS Post processing: less than 0.25 m (HRMS)
DGPS/RTCM based: less than 0.25 m (HRMS)
Table A-1. Receiver General Specifications (Continued)

Topcon GR-3 Specifications

General

Brand	Topcon
Model	GR-3
Category	Receiver
Language	English