The GTR51 is a multisystem/multifrequency GNSS (Global Navigation Satellite System) receiver intended for time and frequency transfer. The receiver supports both code and phase measurements using signals of several systems in several frequency channels. Thanks to large receiver bandwidth and advanced signal processing, even the code measurements provide sub-nanosecond accuracy. Critical elements are placed in a thermostat box. The receiver can be directly connected to a local net/internet which allows remote control and output data download and upload.

The receiver is produced in three variants, see table.

DEVICE SYSTEMS ANTENNA SET
GPS GALILEO SBAS GLONASS
GTR51 2065.100.10 2065.527.30 2065.000.10
2065.100.11   2065.527.30 2065.000.11
2065.100.12     2065.527.30 2065.000.12

PN (RN): 2065.100.10, 2065.100.11, 2065.100.12

Operation

The operation is fully automatic. After the very first configuration, the receiver continuously collects the measurement data. Output files in several standard/proprietary formats can be generated from the collected data. The data processing can be started manually or by a scheduler which enables routine processing at given times (daily, weekly, ...). The resulting data files can be downloaded from the receiver, automatically uploaded to a server or automatically saved to an external disk. A brief message is sent to an e-mail address after the processing is finished. The output measurement data can be referenced to the input 1PPS and/or to the output 1PPS time mark.

 

Remote control

The receiver can be controlled from any computer on the net. The User Interface has the form of a web page which can be accessed using a web browser. It enables control of the receiver, monitoring of the receiver operation, and download of the measurement data. Authorization is required to access the receiver.

 

Diagnostic system

The diagnostic system indicates several dozens of operational events and states. The diagnostic messages can be recorded in the log, displayed in the User Interface, and sent to an e-mail address.

 

Monitoring with graphical representation

History of operational parameters (time difference, temperature, satellite elevation/azimuth, ...) is displayed in graphs in the User Interface.

TIME REFERENCE INPUT
Input signal 1PPS (leading edge)
Input impedance 50 Ω
Trigger level 0 V-2 V adjustable
Max level 5.5 V/50 Ω
Min level -0.1 V/50 Ω
The 1PPS mark must be coherent with the frequency reference at the 10 MHz input.
TIME REFERENCE OUTPUT
Output signal 1PPS (leading edge)
Low level <0.5 V/50 Ω
High level >1.8 V/50 Ω
FREQUENCY REFERENCE INPUT
Input signal 10 MHz
Input impedance 50 Ω
Max level 3 Vpp/50 Ω
Min level 0.5 Vpp/50 Ω
PRECISION
Code measurement < 0.5 ns rms (CGGTTS data, short-baseline common view, GPS, GALILEO, GLONASS)
Phase measurement < 30 ps rms (short-baseline common view)
OUTPUT DATA FORMATS
CGGTTS all tracks/all satellites in view, MSIO iono-delay, versions 01 and 02
RINEX observation/navigation files, versions 2.10 (GPS only), 2.11 and 3.01
RAW proprietary format, all signals, both code and carrier phase data
EL_MASK CNR analysis and search for obstacles
STAT statistics of collected measurement data
L3P_30s standard P3 data, 30 s sampling period
L3P_1s P3 data, 1 s sampling period
BETA proprietary format similar to planned CGGTTS V03, GPS, GALILEO, GLONASS
1PPS_DIF proprietary format, 1PPS_IN - 1PPS_OUT difference
GNSS RECEIVER
Supported signals
GPS: L1C/A , L1P, L2C, L2P, L5
GLONASS: L1OF, L1SF, L2OF, L2SF
GALILEO: E1, E5a
SBAS: L1, L5
Type of measurement code/carrier phase referenced to input/output 1PPS
Receiver bandwidth 24 MHz
Number of satellites all in view
TIME INTERVAL COUNTER
Precision < 15 ps rms
Thermostat based on thermoelectric modules
Dimensions 19“/2U standard chassis
Power supply 100 V-240 V AC/50 Hz-60 Hz
Operating temperature 0 ºC to 50 ºC
ANTENNA
Antenna supply 5 V/up to 90 mA (plus on inner contact)
Recommended antenna Novatel GNSS-850
GTR51 operating instructions 2065.010.12
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GTR51 - Time and frequency transfer GNSS receiver set

PN (RN): 2065.000.10

Set consists of GTR51 receiver (2065.100.10) and accessories. The GTR51 is a multisystem/multifrequency GNSS (Global Navigation Satellite...

GTR51 - Time and frequency transfer GNSS receiver set

PN (RN): 2065.000.11

Set consists of GTR51 receiver (2065.100.11) and accessories. The GTR51 is a multisystem/multifrequency GNSS (Global Navigation Satellite...

GTR51 - Time and frequency transfer GNSS receiver set

PN (RN): 2065.000.12

Set consists of GTR51 receiver (2065.100.12) and accessories. The GTR51 is a multisystem/multifrequency GNSS (Global Navigation Satellite...