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In order to solve the problem of clock synchronization under the condition of small sample set, a state optimal estimation method of data fusion bases on natural selection PSO algorithm is proposed. First, use Kalman filtering algorithm and Bootstrap method to local filtering process the measurement data under the condition of Monte Carlo simulation experiment, and the reliability of the data is improved...
This paper presents our findings in using pulse measurements from a jittery one pulse per second (pps) global positioning system (GPS) clock, to synchronize the real-time clock (RTC) in each node of a wireless sensor network, when the timing jitter is subject to a empirically determined bimodal non-Gaussian distribution. Specifically, we 1) estimate the RTC phase and align it with an estimate of the...
This paper describes an efficient method of estimating the ratio of clock frequency between two clocks used at the two end nodes of a one-way path. This estimation method relies on the local time measurements on the packets in a data stream going from a source node to a sink node. The time durations between adjacent packets are measured at both the source and the sink nodes according to the local...
We analyze the statistical properties of slope estimates obtained from linear regression with sample-minimum Erlang variates. The sample-minimum of sequential blocks has the effect of introducing non-uniform time samples. It is shown that this non-uniformity has negligible effect on the slope estimate variance, but introduces a spurious low-frequency component in the power spectrum, which may be detrimental...
In this paper a concept for bounding the operation range of IEEE 802.15.4 based wireless sensors is introduced. The distance-bounding is based on a signal round-trip time of flight measurement. For the round-trip time of flight measurement two essential problems have to be solved: on the one hand the time of arrival estimation and on the other hand precise clock synchronization. In our novel approach...
When using network synchronization protocols like IEEE 1588 or NTP, a common approach to increase the performance is to add hardware support for timestamping the essential synchronization messages. Further, timestamping accuracy and the stability of the local oscillator of a network synchronized node are the two main influence factors for high accuracy clock synchronization. While the latter is subject...
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