A Satellite-Ground Precise Time Synchronization Method and Analysis on Time Delay Error Caused by Motion

Guo, Yanming; Bai, Yan; Gao, Shuaihe; Pan, Zhibing; Han, Zibin; Gao, Yuping; Lu, Xiaochun

doi:10.1007/978-981-16-3146-7_16

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…In the next step, we will partially inherit of satelliteground time synchronization technology [15][16][17][18][19] and analyse the errors from seven aspects, including spatial distance error, transmission and reception channel delay error, receiving measurement error, multipath effect error, frequency synthesis error, antenna phase centre error, and clock error correction model error, aiming to further Improve the time synchronization performance of the system. In addition, more optimized estimation models for synchronization results may be further extended to quantum optimization algorithm [20].…”

Section: ∆1ppsmentioning

confidence: 99%

A New Device for Two-Way Time-Frequency Real-Time Synchronization

Zhang¹,

Zhang²,

Zou³

et al. 2023

Journal of Internet Technology

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<p>The netted wireless sensor nodes or coherent accumulation processing in multistatic radar imaging requires high accuracy time synchronization. Although GNSS timing can also be used as a time synchronization method to serve the applications above, its timing accuracy will be limited. In this context, we present the hardware implementation for Two-Way Time-Frequency Real-Time Synchronization (TWTFRTS) with an automatic adaptive jitter elimination algorithm based on Kalman and PID, which is implemented in a real-time, low-cost, portable Xilinx ZYNQ device. A short (2 km) baseline TWTFRTS experiment was done with a pair of devices composed of a master device and a slave device. The result shows a high precision of time synchronization performance with the standard deviation (1 σ) better than 1 ns.</p> <p> </p>

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Section: ∆1ppsmentioning

confidence: 99%

A New Device for Two-Way Time-Frequency Real-Time Synchronization

Zhang¹,

Zhang²,

Zou³

et al. 2023

Journal of Internet Technology

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“…In this study, we have studied a tri-frequency time comparison method [17], an improved two-way time comparison algorithm. The error correction strategies in the two-way time comparison are briefly introduced.…”

Section: Introductionmentioning

confidence: 99%

Analysis of orbit error effect on ultra-high space-ground two-way time comparison

Guo

Bai

Gao

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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In view of the characteristics of the low-orbit spacecraft's orbit, the influence of the low-orbit spacecraft's orbit error on the time comparison method based on tri-frequency is theoretically analyzed. With the simulation and test, validing the effectiveness of the precise two-way time comparison method, and the accuracy of the method can reach the order of ps-level. Furthermore, with the simulated data, the influence of orbit error on the ultra-high precise space-ground time comparison is analyzed. The results show that the percentage of orbit noise in the total orbit error has a great influence on the accuracy of time comparison. In order to achieve a link accuracy better than ps, the percentage of orbit noise should be kept within 5%.

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“…Specifically, the GNSS-based timing methods are suitable for outdoor nanosecond level timing. The method proposed in [19] is used in satellite-ground time-frequency communication, achieving upto 0.5 picosecond (10 −12 s) synchronization. These methods require an open area for good satellite signal reception.…”

Section: Introductionmentioning

confidence: 99%

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

Zhang¹,

Zheng²,

Wang³

2019

IEEE Access

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Absolute time synchronization (timing) is a constant demand in various fields. There are many timing techniques at present. They are mainly based on dedicated equipments such as GNSS or specific protocols such as NTP, PTP, SIB16, etc. Different timing methods are applied according to the scenario, cost and demands for timing accuracy. Recently, the timing demands for some wireless scenarios have become increasingly urgent, like power IoT and auto-driving. However, due to the instability and complexity of radio link, the current methods can hardly meet the demands of high-precision and low cost simultaneously in mobile network. Here we propose a timing method over air interface based on physical layer signals (TAP). Periodic physical layer signals in both downlink and uplink channel are considered to reduce the impact of radio link instability on timing. We implemented the proposed method on an open source LTE software defined radio platform named OpenAirInterface and conducted a series of tests. Our tests prove that TAP can provide microsecond-level timing over the air interface, and it is more stable and precise than PTP. Further simulation shows that using TAP in 5G NR can improve the timing accuracy. INDEX TERMS Air interface, high-precision timing, IoT, physical layer, time synchronization.

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A Satellite-Ground Precise Time Synchronization Method and Analysis on Time Delay Error Caused by Motion

Cited by 7 publications

References 11 publications

A New Device for Two-Way Time-Frequency Real-Time Synchronization

A New Device for Two-Way Time-Frequency Real-Time Synchronization

Analysis of orbit error effect on ultra-high space-ground two-way time comparison

TAP: A High-Precision Network Timing Method Over Air Interface Based on Physical-Layer Signals

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