Sub-10–16 accuracy GNSS frequency transfer with IPPP

Petit, Gérard

doi:10.1007/s10291-020-01062-2

Cited by 43 publications

(34 citation statements)

References 18 publications

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Section: Free Space-time and Frequency Linksmentioning

confidence: 99%

“…Currently, primary microwave clocks are connected via satellites [36] in the microwave domain by the existing GNSS infrastructure [122] or dedicated two-way time and frequency transfer (TWTFT) links [123][124][125]. Demonstrated frequency transfer uncertainties of existing microwave links (MWLs) reach into the 10 −16 range after averaging times of days [122,126] and into the 10 −17 range after averaging times of weeks with integer ambiguity resolution [122], and demonstrated time transfer uncertainties lie in the nanosecond region [125]. A new generation of MWL equipment is under development [21,127], which reaches in laboratory tests timing instabilities of < 100 fs for averaging times τ = 10 s to 2000 s [21], which is equivalent to fractional frequency transfer uncertainties of < 5 × 10 −17 at 2000 s. Similar performances are achieved in the optical domain by Time Transfer by Laser Link (T2L2) [128] and the European Laser Timing (ELT) experiment [129] employing time-ofarrival measurements of laser pulses.…”

Section: Free Space-time and Frequency Linksmentioning

confidence: 99%

See 1 more Smart Citation

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible roadmap for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. research areas. As anticipated for a Europe-based event, about 80% of the registrations are from European countries, as seen in the lower right panel of Fig. 1, but there is also significant North American and Asian participation.This community provides the backbone for long-term planning and the support needed to see the challenging cold atom missions foreseen in the road-map through to their successful completions. The participants display an excellent and diverse mix of expertise, building an outstanding basis for the success of the workshop and the development of the corresponding road-map, which defines possible interim and long-term scientific goals and outlines technological milestones. Section 2 is an introduction to our document, Sections 3 to 5 discuss our main science themes, namely atomic clocks, Earth Observation and fundamental physics, Section 6 discusses the technology developments required before quantum sensors can be deployed in space, Section 7 summarises the discussions during the Workshop, and in Section 8 we outline the corresponding Community road-map.

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Section: Free Space-time and Frequency Linksmentioning

confidence: 99%

Section: Free Space-time and Frequency Linksmentioning

confidence: 99%

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Currently, primary microwave clocks are connected via satellites [38] in the microwave domain by the existing GNSS infrastructure [124] or dedicated two-way time and frequency transfer (TWTFT) links [125][126][127]. Demonstrated frequency transfer uncertainties of existing microwave links (MWLs) reach into the 10 -16 range after averaging times of days [124,128] and into the 10 -17 range after averaging times of weeks with integer ambiguity resolution [124], and demonstrated time transfer uncertainties lie in the nanosecond region [127].…”

Section: Free-space Time and Frequency Linksmentioning

confidence: 99%

Cold atoms in space: community workshop summary and proposed road-map

Alonso

Alpigiani

Altschul

et al. 2022

EPJ Quantum Technol.

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We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible road-map for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with the European Space Agency (ESA) and national space and research funding agencies.

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“…It requires careful consideration of various errors and accurate corrections to achieve global high precision time transfer [5]. The optical fiber time comparison link also has considerable high precision, but it also has high maintenance cost compared with the PPP method, and the construction is subject to various restrictions [6]. The PPP time transfer method has been widely used in international time transfer to provide high precision at low economic cost [7,8].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Near Real-time GNSS PPP Time Transfer with IGS Products

Chen

Yuan

et al. 2022

IJECER

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The GNSS time transfer technology is the high precision time transfer method based on the navigation satellite system and has been widely applied in time and frequency. Benefiting from the development of GNSS time transfer technology and the expansion of user needs for real-time time service applications, real-time time transfer technology has become an important research direction. GNSS Precise Point Positioning (PPP) is one of the most commonly used methods of GNSS time transfer technology. With the development of the many facilities, the application of the real-time GNSS PPP has become wider and wider. In this paper, we demonstrate and evaluate the performance of the international GNSS service (IGS) products in the near real-time PPP time transfer technology. A set of the PPP solutions were computed from the observed data from the timekeeping laboratories, and three types of products provided by IGS, including Ultra-Rapid (IGU), Rapid (IGR), and Final (IGS final) orbit and clock offset products. IGS final and IGR products have extremely high accuracy and stability and are used as a reference for the time transfer with IGU product. The near real time clock offset and the comparison link performed with the IGU product can provide a time comparison service with an accuracy of 0. 5ns for near real time applications.

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Sub-10–16 accuracy GNSS frequency transfer with IPPP

Cited by 43 publications

References 18 publications

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Cold atoms in space: community workshop summary and proposed road-map

Performance Evaluation of Near Real-time GNSS PPP Time Transfer with IGS Products

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