High-precision time comparison via satellite and observed discrepancy of synchronization

Saburi, Y.; Yamamoto, Masakazu; Harada, Kikuo

doi:10.1109/tim.1976.6312267

Cited by 24 publications

(6 citation statements)

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“…The 1 PPS signal provides precise clock synchronization [34]. The original signal is the frequency signal (with typical frequency10 MHz) output by the atomic clock.…”

Section: One Pulse Per Second (1 Pps) Signalmentioning

confidence: 99%

Measuring Height Difference Using Two-Way Satellite Time and Frequency Transfer

et al. 2022

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According to general relativity theory (GRT), the clock at a position with lower geopotential ticks slower than an identical one at a position with higher geopotential. Here, we provide a geopotential comparison using a non-transportable hydrogen clock and a transportable hydrogen clock for altitude transmission based on the two-way satellite time and frequency transfer (TWSTFT) technique. First, we set one hydrogen clock on the fifth floor and another hydrogen clock on the ground floor, with their height difference of 22.8 m measured by tape, and compared the time difference between these two clocks by TWSTFT for 13 days. Then, we set both clocks on the ground floor and compared the time difference between the two clocks for seven days for zero-baseline calibration (synchronization). Based on the measured time difference between the two clocks at different floors, we obtained the height difference 28.05.4 m, which coincides well with the tape-measured result. This experiment provides a method of height propagation using precise clocks based on the TWSTFT technique.

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“…The 1 PPS signal provides precise clock synchronization [34]. The original signal is the frequency signal (with typical frequency10 MHz) output by the atomic clock.…”

Section: One Pulse Per Second (1 Pps) Signalmentioning

confidence: 99%

Measuring Height Difference Using Two-Way Satellite Time and Frequency Transfer

et al. 2022

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“…which is the uncertainty in the measure of the position, 2 2 2 0 ET E t (39) which is the time uncertainty and (40) which indicates in what sense the curvature of a region of size L can be related to the presence of energy and momentum in it. The uncertainty relations (38)- (40) are obtained by making use of a dimensional analysis which really may lead also to many other possible (infinite) final expressions; as a consequence, a possible criticism to them is that they cannot be treated as fundamental.…”

Section: Inertial Mass Gravitational Mass Energy Density Of Quantummentioning

confidence: 99%

“…For hypothetical in vacuum light signals circumnavigating the Earth at the Equator at constant distance R from the centre of the Earth the velocity of light is given by the Schwarzschild metric equation: In order to provide an explanation of the experimental data on the propagation of microwaves near to the surface of the Earth [32,33,39] and the Shapiro radar echo delay experiments for microwave signals passing close to the Sun [38], in two 2001 papers Su proposed the existence of different 'effective aethers' around the Earth and the Sun in the context of a classical electromagnetic wave theory distinct from that given by special relativity [40,41]. Here, we have shown, however, that the existence of such 'effective aethers' is a necessary consequence of general relativity in the picture of a 3D quantum vacuum which determines dragging effects as a consequence of the changes of its energy density, so that no new classical theory of the type proposed by Su is required.…”

Section: Sagnac Effect and Dynamic Quantum Vacuummentioning

confidence: 99%

Dynamic Quantum Vacuum and Relativity

Fiscaletti¹

2017

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<p>A model of a three-dimensional dynamic quantum vacuum with variable energy density is proposed. In this model, time we measure with clocks is only a mathematical parameter of changes running in quantum vacuum. Mass and gravity are carried by the variable energy density of quantum vacuum. Each elementary particle is a structure of quantum vacuum and diminishes the quantum vacuum energy density. Symmetry “particle – diminished energy density of quantum vacuum” is the fundamental symmetry of the universe which gives origin to the inertial and gravitational mass. Special relativity’s Sagnac effect in GPS system and important predictions of general relativity such as precessions of the planets, the Shapiro time delay of light signals in a gravitational field and the geodetic and frame-dragging effects recently tested by Gravity Probe B, have origin in the dynamics of the quantum vacuum which rotates with the earth.</p>

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“…In 1913 Sagnac showed that the propagation time of a light signal around a closed path on a rotating frame depends on whether the signal travels with or against the sense of rotation. The phenomenon is of relevance in clock synchronisation experiments (Saburi et al 1976); it also has a practical use in modern laser gyroscopes (Chow et al 1985).…”

Section: Difference In Propagation Timesmentioning

confidence: 99%