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 | |||
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 | 100V-240V AC/50Hz-60Hz |
| 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 |
|---|
GTR51 – Time and frequency transfer GNSS receiver set
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
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
Set consists of GTR51 receiver (2065.100.12) and accessories. The GTR51 is a multisystem/multifrequency GNSS (Global Navigation Satellite…