The IAU Resolutions on Astronomical Reference Systems, Time Scales, and Earth Rotation Models (Draft 4)

Kaplan, G. H.

doi:10.21236/ada434096

Cited by 73 publications

(34 citation statements)

References 16 publications

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“…Orbits of satellites are evaluated in the GCRS at the level of a few cm by means of the Einstein-Infeld-Hoffmann equations at the order 1/c 2 [23] using the relativistic Newton potential. Instead the trajectories of the ground clocks in the GCRS are evaluated from their positions fixed on the Earth crust (ITRS, International Terrestrial Reference System) by using the non-relativistic IERS2003 conventions [24,25].…”

Section: Theoretical Analysis Of Frequency Comparison Signalsmentioning

confidence: 99%

Einstein Gravity Explorer–a medium-class fundamental physics mission

et al. 2008

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The Einstein Gravity Explorer mission (EGE) is devoted to a precise measurement of the properties of space-time using atomic clocks. It tests one of the most fundamental predictions of Einstein's Theory of General Relativity, the gravitational redshift, and thereby searches for hints of quantum effects in gravity, exploring one of the most important and challenging frontiers in fundamental physics. The primary mission goal is the measurement of the gravitational redshift with an accuracy up to a factor 10 4 higher than the best current result. The mission is based on a satellite carrying cold atombased clocks. The payload includes a cesium microwave clock (PHARAO), an optical clock, a femtosecond frequency comb, as well as precise microwave time transfer systems between space and ground. The tick rates of the clocks are continuously compared with each other, and nearly continuously with clocks on earth, during the course of the 3-year mission. The highly elliptic orbit of the satellite is optimized for the scientific goals, providing a large variation in the gravitational potential between perigee and apogee. Besides the fundamental physics results, as secondary goals EGE will establish a global

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Section: Theoretical Analysis Of Frequency Comparison Signalsmentioning

confidence: 99%

Einstein Gravity Explorer–a medium-class fundamental physics mission

et al. 2008

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“…It should be noted that the NFA recommendations on terminology have already been taken into account in the 2006 editions of the Almanac offices that have implemented the IAU 2000 resolutions , in the updated IERS Conventions (ongoing), and USNO Circular 179 (Kaplan 2005).…”

Section: Discussionmentioning

confidence: 99%

Division I / Working Group Nomenclature for Fundamental Astronomy

Capitaine¹,

Andrei²,

Calabretta³

et al. 2007

Proc. IAU

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“…The vectors except r 1 are defined in the barycentric celestial reference system (BCRS) that is oriented according to the international celestial reference system (ICRS). 14,15) The r 1 is defined in the geocentric celestial reference system (GCRS). 16) However, according to the four-dimensional transformation between the BCRS and the GCRS, 14,15) consideration of r 1 in the BCRS brings a positional error of less than 1 m, and as a result of this precision, it can still be said that r ¼ r E þ r 1 .…”

Section: Forward and Inverse Timing Modelsmentioning

confidence: 99%

Synchronizing of Multiple Time-of-Arrivals for Pulsar-Based Navigation

Huang

Peng

Liang

et al. 2014

Trans. Japan Soc. Aero. S Sci.

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Spacecraft can observe multiple sources to achieve the goal of absolute position determination in pulsar-based navigation. In this paper, we draw attention to the problems associated with synchronizing of multiple time-of-arrival (TOA) measurements. The importance of this for navigation performance is not fully appreciated. Based on high-precision pulsar timing models, we establish the linear pulse phase measurement equation for near-Earth spacecraft and deduce the formulae of apparent pulse frequency (APF). We also develop the TOA synchronization model that uses APF to propagate pulse phases. We apply this model in numerical simulations that implement the extended Kalman filter (EKF) to estimate navigation states for geostationary (GEO) satellites. The results show that our model can effectively control navigation errors after TOAs are synchronized properly. We expect that the TOA synchronization technique presented in this paper may be useful for performance improvement of pulsar-based navigation.

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The IAU Resolutions on Astronomical Reference Systems, Time Scales, and Earth Rotation Models (Draft 4)

Cited by 73 publications

References 16 publications

Einstein Gravity Explorer–a medium-class fundamental physics mission

Einstein Gravity Explorer–a medium-class fundamental physics mission

Division I / Working Group Nomenclature for Fundamental Astronomy

Synchronizing of Multiple Time-of-Arrivals for Pulsar-Based Navigation

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