Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization

Miao, Jing; Wang, B.; Bai, Yu; Yuan, Ye; Gao, Chao; Wang, L. J.

doi:10.1063/1.4921001

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…plays an important role in the infrastructure construction and cutting-edge scientific research fields, such as precise timekeeping, navigation and positioning, radar networking, detection of deep space, and precise measurement [1][2][3]. Compared with atmospheric channels and satellite links, optical fiber links have the advantages of low loss, high reliability, and anti-electromagnetic interference, which are suitable for the long-distance transmission of signals [4]. However, the length and refractive index of the optical fibers are susceptible to environmental temperature and mechanical vibration, which may cause phase fluctuations of the signal and deteriorate the frequency stability at the remote site [5].…”

Section: Introduction He High-precision Frequency Transmission Techniquementioning

confidence: 99%

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Zhang

Xie

et al. 2022

IEEE Photonics J.

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We proposed an all-optical Ka-band microwave long-distance dissemination system based on an optoelectronic oscillator (OEO). In this system, a single tone with high spectrum purity and low phase noise is excited by an injection-locked OEO, and distributed to the remote site through the fiber loop of the OEO at the same time. The second harmonic of the reference signal modulates the round-tripping optical signal at the local site, which achieves the phase conjugator at the optical domain. At the remote end, the phase-conjugated signal is photomixed with the OEO signal to eliminated the phase offset. The proposed scheme improves the phase noise of the high frequency signal received at the remote site and reduces the photoelectric conversion loss. We demonstrated the transmissions of a 36 GHz frequencyquadrupled RF signal along a 6 km optical fiber loop, and the frequency stability is 1.069×10 -14 /1s and 3.3×10 -16 /1000s. The single-sideband (SSB) phase noise of the received signal at the remote site is up to -130 dBc/Hz at 10 kHz offset frequency.

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Section: Introduction He High-precision Frequency Transmission Techniquementioning

confidence: 99%

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Zhang

Xie

et al. 2022

IEEE Photonics J.

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“…[30] A real-time frequency dissemination link based on active carrier-phase compensation has been constructed, reaching the relative stability of 3.2 × 10 −13 /s and 4.4 × 10 −17 /d over 80-m free space. [31,32] In previous work, we engaged a microwave link between one ground station and the satellite to detect the carrier-phase noise in real-time. [33] After compensation, the result of remaining phase error calculated by the host computer is recorded as the result but no frequency standard signal been recovered in the ground station.…”

Section: Introductionmentioning

confidence: 99%

Real-time frequency transfer system over ground-to-satellite link based on carrier-phase compensation at 10⁻¹⁶ level*

Liang¹,

Wang²,

Bai³

et al. 2021

Chinese Phys. B

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We demonstrate a novel and stable frequency transfer scheme over ground-to-satellite link based on real-time carrier-phase detection and compensation. We performed a zero-baseline measurement with the designed system, an uninterrupted frequency standard signal is recovered in the reception station without additional post-correction of delay error caused in the route, which is because the phase error of the entire route is tracked and compensated continuously in real-time. To achieve this goal, we employed two carriers in the system and the differential signal is transferred in order to eliminate the instability results from the local oscillator at the satellite transponder as well as the common-mode noise induced in the transfer route and microwave components. The stability of 3 × 10−16 with an integration time of 1 day was achieved and the time fluctuation during one day was measured to be about ±20 ps. Error sources and possible solutions are discussed. Our zero-baseline method shows a promising result for real-time satellite-based time and frequency transfer and deserves further research to find whether it works between long-baseline stations.

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“…The fuel tank inerting system controls the flow rate of NEA conducted into the fuel tank automatically based on the oxygen concentration measured by sensors. If the measurement of the oxygen concentration of the fuel tank is inaccurate, the judgment of the fuel tank inerting system could be compromised causing the oxygen concentration of the fuel tank exceed the safety range [2].…”

Section: Introductionmentioning

confidence: 99%

The Oxygen Concentration Measurement of an Aircraft Fuel Tank Inerting System

Cai

Lin

2014

AMM

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There are several oxygen concentration measurement methods applied in aircraft fuel tank inerting systems. In this work, an aircraft fuel tank inerting experiment system was built and oxygen concentration of the fuel tank ullage (fuel tank space above the surface of the fuel which is filled with fuel vapor and air) and the dissolved oxygen in the fuel was detected with the methods of light absorption and optical fluorescence. The experiment was conducted through different operating conditions and results has illustrated that the light absorption method as well as the optical fluorescence method has the same accuracy sensing calibration gases, but the suitable condition of the two methods are different. Results have shown that the method of light absorption is more suitable to test oxygen concentration of gas mixture, and the method of optical fluorescence is more suitable to detect the concentration of dissolved oxygen in liquid substance.

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Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization

Cited by 9 publications

References 24 publications

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Real-time frequency transfer system over ground-to-satellite link based on carrier-phase compensation at 10⁻¹⁶ level*

The Oxygen Concentration Measurement of an Aircraft Fuel Tank Inerting System

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Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization

Cited by 9 publications

References 24 publications

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

An All-Optical Ka-Band Microwave Long-Distance Dissemination System Based on an Optoelectronic Oscillator

Real-time frequency transfer system over ground-to-satellite link based on carrier-phase compensation at 10−16 level*

The Oxygen Concentration Measurement of an Aircraft Fuel Tank Inerting System

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Product

Resources

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Real-time frequency transfer system over ground-to-satellite link based on carrier-phase compensation at 10⁻¹⁶ level*