An Improved Time Synchronous System Based on GPS Disciplined Rubidium

Baojian, Cui; Zhou, Donghua; Dazhi, Xin

doi:10.1109/icicta.2010.843

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…The time series of computed clock offsets provides a measure of the oscillator's stability relative to GPS time. [5][6] GPS time received by GPS receiver has large random error but no accumulative error. Crystal oscillator has small random error but large accumulative one.…”

Section: Estimation Of Actul Crystal Frequencymentioning

confidence: 99%

Research and realization of high-precision GPS time transfer system

Zhang

Xia

Chao-hai

et al. 2013

2013 International Conference on Computational Problem-Solving (ICCP)

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This paper presents a high-precision and low-cost time transfer system based on GPS receiver and Field Programmable Gate Array (FPGA). With the aid of the precise one-pulse-per-second (1PPS) signal and the short-term frequency stability of crystal oscillator, this system can obtain highprecision absolute time which is synchronized to Universal Time Coordinated (UTC), by measuring the real-time crystal frequency. A time stamping unit would carry up time information and raw time-domain data into "snapshot" data, and then transmit them to computer for Time-Difference-Of-Arrival (TDOA) analysis. The GPS time transfer system on FPGA has been applied in a radio monitoring receiver.

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Section: Estimation Of Actul Crystal Frequencymentioning

confidence: 99%

Research and realization of high-precision GPS time transfer system

Zhang

Xia

Chao-hai

et al. 2013

2013 International Conference on Computational Problem-Solving (ICCP)

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“…3) Time Synchronization: All the RSUs and mobile nodes are synchronized [39]. Each time slot is divided into two sub-slots.…”

Section: ) Transceiver Antenna: the Directional Antenna Formentioning

confidence: 99%

Neighbor Discovery for VANET with Gossip Mechanism and Multi-packet Reception

Wei¹,

Chen²,

Yang³

et al. 2021

Preprint

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Neighbor discovery (ND) is a key initial step of network configuration and prerequisite of vehicular ad hoc network (VANET). However, the convergence efficiency of ND is facing the requirements of multi-vehicle fast networking of VANET with frequent topology changes. This paper proposes gossip-based information dissemination and sensing information assisted ND with MPR (GSIM-ND) algorithm for VANET. GSIM-ND algorithm leverages efficient gossip-based information dissemination in the case of multi-packet reception (MPR). Besides, through multi-target detection function of multiple sensors installed in roadside unit (RSU), RSU can sense the distribution of vehicles and help vehicles to obtain the distribution of their neighbors. Thus, GSIM-ND algorithm leverages the dissemination of sensing information as well. The expected number of discovered neighbors within a given period is theoretically derived and used as the critical metric to evaluate the performance of GSIM-ND algorithm. The expected bounds of the number of time slots when a given number of neighbors needs to be discovered is derived as well. The simulation results verify the correctness of theoretical derivation. It is discovered that GSIM-ND algorithm proposed in this paper can always reach the short-term convergence quickly. Moreover, GSIM-ND algorithm is more efficient and stable compared with completely random algorithm (CRA), scan-based algorithm (SBA) and gossip-based algorithm. The convergence time of GSIM-ND algorithm is 40%-90% lower than that of these existing algorithms for both low density and high density networks. Thus, GSIM-ND can improve the efficiency of ND algorithm.

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A Design of LORAN Disciplined Oscillator

Hwang¹,

Choi²,

Yeo³

et al. 2013

Journal of Positioning, Navigation, and Timing

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This article presents the design of long range navigation (LORAN)-disciplined oscillator (LDO), employing the timing information of the LORAN system, which was developed as a backup system that corrects the vulnerability of the global positioning system (GPS)-based timing information utilization. The LDO designed on the basis of hardware generates a timing source synchronized with reference to the timing information of the LORAN-C receiver. As for the LDO-based timing information measurement, the Kalman filter was applied to estimate the measurement of which variance was minimized so that the stability performance could be improved. The oven-controlled crystal oscillator (OCXO) was employed as the local oscillator of the LDO. The controller was operated by digital proportional-integral-derivative (PID) controlling method. The LDO performance evaluation environment that takes into account the additional secondary factor (ASF) of the LORAN signals allows for the relative ASF observation and data collection using the coordinated universal time (UTC). The collected observation data are used to analyze the effect of ASF on propagation delay. The LDO stability performance was presented by the results of the LDO frequency measurements from which the ASF was excluded.

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An Improved Time Synchronous System Based on GPS Disciplined Rubidium

Cited by 6 publications

References 5 publications

Research and realization of high-precision GPS time transfer system

Research and realization of high-precision GPS time transfer system

Neighbor Discovery for VANET with Gossip Mechanism and Multi-packet Reception

A Design of LORAN Disciplined Oscillator

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