Improved GNSS navigation with chip-scale atomic clocks

Krawinkel, Thomas

doi:10.15488/4684

Cited by 5 publications

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“…There is a need for lasers that are smaller and more reliable so that experiments can scale up, and in general, photonic integration will lead to reduced size, weight, and power consumption, as well as reduced sensitivity to environmental disturbances. Photonic integration is a promising approach to miniaturize laser systems as well as improve their reliability [12][13][14] , thereby enabling systems with larger number of entangled atoms 15,16 , higher sensitivity quantum sensors 6,17 , higher precision positioning, timing and navigation 18 , and probing of complex molecules [19][20][21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

Visible light photonic integrated Brillouin laser

et al. 2021

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Narrow linewidth visible light lasers are critical for atomic, molecular and optical (AMO) physics including atomic clocks, quantum computing, atomic and molecular spectroscopy, and sensing. Stimulated Brillouin scattering (SBS) is a promising approach to realize highly coherent on-chip visible light laser emission. Here we report demonstration of a visible light photonic integrated Brillouin laser, with emission at 674 nm, a 14.7 mW optical threshold, corresponding to a threshold density of 4.92 mW μm−2, and a 269 Hz linewidth. Significant advances in visible light silicon nitride/silica all-waveguide resonators are achieved to overcome barriers to SBS in the visible, including 1 dB/meter waveguide losses, 55.4 million quality factor (Q), and measurement of the 25.110 GHz Stokes frequency shift and 290 MHz gain bandwidth. This advancement in integrated ultra-narrow linewidth visible wavelength SBS lasers opens the door to compact quantum and atomic systems and implementation of increasingly complex AMO based physics and experiments.

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Section: Introductionmentioning

confidence: 99%

Visible light photonic integrated Brillouin laser

et al. 2021

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Performance of miniaturized atomic clocks in static laboratory and dynamic flight environments

et al. 2020

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Miniaturized atomic clocks with high frequency stability as local oscillators in global navigation satellite system (GNSS) receivers promise to improve real-time kinematic applications. For a number of years, such oscillators are being investigated regarding their overall technical applicability, i.e., transportability, and performance in dynamic environments. The short-term frequency stability of these clocks is usually specified by the manufacturer, being valid for stationary applications. Since the performance of most oscillators is likely degraded in dynamic conditions, various oscillators are tested to find the limits of receiver clock modeling in dynamic cases and consequently derive adequate stochastic models to be used in navigation. We present the performance of three different oscillators (Microsemi MAC SA.35m, Spectratime LCR-900 and Stanford Research Systems SC10) for static and dynamic applications. For the static case, all three oscillators are characterized in terms of their frequency stability at Physikalisch-Technische Bundesanstalt, Germany's national metrology institute. The resulting Allan deviations agree well with the manufacturer's data. Furthermore, a flight experiment was conducted in order to evaluate the performance of the oscillators under dynamic conditions. Here, each oscillator is replacing the internal oscillator of a geodetic-grade GNSS receiver and the stability of the receiver clock biases is determined. The time and frequency offsets of the oscillators are characterized with regard to the flight dynamics recorded by a navigation-grade inertial measurement unit. The results of the experiment show that the frequency stability of each oscillator is degraded by about at least one order of magnitude compared to the static case. Also, the two quartz oscillators show a significant g-sensitivity resulting in frequency shifts of − 1.2 × 10−9 and + 1.5 × 10−9, respectively, while the rubidium clocks are less sensitive, thus enabling receiver clock modeling and strengthening of the navigation performance even in high dynamics.

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Comparison and Evaluation of Clock-aided and Classical Multi-GNSS Flight Navigation

Jain

Schön

2020

2020 European Navigation Conference (ENC)

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Improved GNSS navigation with chip-scale atomic clocks

Cited by 5 publications

References 0 publications

Visible light photonic integrated Brillouin laser

Visible light photonic integrated Brillouin laser

Performance of miniaturized atomic clocks in static laboratory and dynamic flight environments

Comparison and Evaluation of Clock-aided and Classical Multi-GNSS Flight Navigation

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