研究目的
To solve the estimation problems of node clock offset for modules status monitoring in WSN for large-scale photovoltaic modules monitoring.
研究成果
The TSP-GDM algorithm can be applied to monitoring the state of large-scale photovoltaic modules with higher synchronization accuracy and lower energy consumption compared to RBS, TPSN and RTSP algorithms.
研究不足
The improvement of synchronization accuracy is usually at the expense of extra synchronization consumption, that is, without sufficient statistics of time stamps, it is difficult to achieve the synchronization accuracy of nodes.
1：Experimental Design and Method Selection:
The TSP-GDM algorithm is proposed to avoid clock skew in WSN for large-scale photovoltaic modules monitoring. It establishes interdependence of local time stamps between network nodes according to a linear clock model and achieves local exchange and share of local time stamps in nodes by means of wireless transmission. An estimation method with the Gaussian Delay Model is designed to deal with the estimation problems of the node clock offset.
2：Sample Selection and Data Sources:
The simulation is carried out with MATLAB, where the stability of crystal oscillator is defined as 50ppm, the phase offset range between the nodes as ?50 ～ 50μs, the random error range of phase offset between the nodes as ?10 ～ 10μs, the ideal interrupt count value at one second as 921600, the three selected nodes as datum node, active synchronization node and passive synchronization node respectively, the synchronization round number n as 0 ～ 50, repetitions of the experiment as
3：List of Experimental Equipment and Materials:
10 MATLAB is used for simulation.
4：Experimental Procedures and Operational Workflow:
The synchronization accuracy of the proposed method is verified with the MATLAB simulation.
5：Data Analysis Methods:
The average synchronization error is average value between the passive synchronization node and data node after 1000 repetitions of experiments.
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