Two-way time transfer experiment via the Horizon satellite

Gurevich, E. L.

doi:10.1088/0026-1394/32/1/006

Cited by 3 publications

(3 citation statements)

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“…We propose another signal which makes it possible to improve the time transfer precision by a factor of approximately 5 . A new modem which uses such a signal is under development [4].…”

Section: Long-baseline Experimentsmentioning

confidence: 99%

“…We have also developed a special modification of the two-way time transfer technique which makes it possible to calculate the time difference in real time without the need for an additional data transmission channel [4]. This modification can be used both in our system and in two-way time transfer with the MITREX modem.…”

Section: Long-baseline Experimentsmentioning

confidence: 99%

“…where T.& and TB are the time differences between the moment at which the signal is received and that at which the local time scale generates a pulse, for stations A and B, respectively; t. 4 and t g are the delays in the transmitters at stations A and B; T A and r g are the delays in the receivers at stations A and B; uUp and a d are the propagation delays between station A and the satellite; b,, and b d are the propagation delays between station B and the satellite; T, is the delay caused by the Sagnac effect. The precision of two-way time transfer is determined by the precision of the T A and Tg measurements; the systematic error depends basically on errors in calibration of the ground station equipment delay.…”

Section: Introductionmentioning

confidence: 99%

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Two-way time transfer experiment via the Horizon satellite

Gurevich

1995

Metrologia

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Two-way time transfer via satellite is one of the most precise methods of time synchronization. This method makes it possible to obtain 0,1 nanosecond precision and decrease systematic error to the nanosecond level. The two-way time transfer system designed in Russia and the results of experiments are described. The experiments consist of two-way time transfer via satellite, ground station delay measurements and a relativity effect calculation. The results of two-way time transfer are compared with GLONASS data.

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“…We propose another signal which makes it possible to improve the time transfer precision by a factor of approximately 5 . A new modem which uses such a signal is under development [4].…”

Section: Long-baseline Experimentsmentioning

confidence: 99%

Section: Long-baseline Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-way time transfer experiment via the Horizon satellite

Gurevich

1995

Metrologia

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Outdoor atmospheric optical two-way time transfer with serial time code

Ren

Hou

et al. 2021

Review of Scientific Instruments

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We demonstrated an optical two-way time transfer scheme in the outdoor free-space link using a simple complex programmable logic device-based serial time coder/decoder. With this scheme, we have transferred a 100 Hz signal with time information over a 120-m outdoor atmospheric link. The time drift, time deviation, and frequency instability are all measured to estimate the quality of the transferred time signal during the transfer process. Within 11 h, the experimental result shows that the total root-mean-square time drift is about 81 ps, with the time deviation of 70 ps at 1-s averaging time and down to 10 ps above 100-s averaging time. The calculation shows that the fractional frequency instability of the transmission link is on the order of 1.4 × 10−10 at 1 s and of 3.0 × 10−15 at 10 000 s. The time deviation and frequency instability for the optical two-way time transfer are superior to those of the Global Positioning System (GPS)-based time transfer method, which implies the technique proposed in this paper is able to be directly used in high-precision time transfer over atmospheric links in a short distance.

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