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TTS-2 GPS Time Transfer System
In collaboration with the International Office of Weights and Measures (BIPM) the Astrogeodynamical Observatory
(AOS) Centre has developed the TTS-2 (Time Transfer System - 21). The TTS-2 is now manufactured by PikTime Systems
in cooperation with the AOS.
The performance of TTS-2 in single-channel mode is similar to that of the original NBS
(National Bureau of Standards) GPS receiver. After correction for ionospheric delays and precise ephemerides,
the root-mean-square noise level for baselines of up to 8000 km is about 3.0 ns, in the multi-channel mode
it is even better.
The TTS-2 consists of a PC industrial computer, a PC card time interval counter,
a Motorola VP Oncore 8-channel GPS engine, appropriate software, an antenna, and connecting cables.
The receiver observes in multi-channel mode according to the International BIPM GPS Common-View Schedule.
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TTS-3 GPS/GLONASS/WAAS/EGNOS Time Transfer System
The Astrogeodynamical Observatory (AOS) of the Space Research Centre following a very successful TTS-2,
has developed a new high-performance Time Transfer System TTS-3. The TTS-3 as TTS-2, is manufactured
by PikTime Systems in cooperation with the AOS.
At present the TTS-3 receiver carries observations on L1 and L2 frequencies for both GPS and GLONASS, receiving GPS C/A and P1 and P-2 codes, GLONASS C/A and P1 and P2 codes, and EGNOS. For time transfer ionospherefree linear combination of P1 and P2 called P3 is used. The TTS-3 consists of a PC industrial computer, a PC card time interval counter, a GNSS 40 channel, appropriate software, an antenna, and connecting cables. The TTS-3 precision in multi-channel P3 mode when using measurements precise ephemerides may reach 1 ns. Both carrier frequency and code measurements are available in RINEX format There are several options available for TTS-3 depending on requested performance. The TTS-3 can be equipped with a temperature-stabilized antenna. The system allows an easy upgrade of
presently available and future options.
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