A wireless sensor network time synchronization performance evaluation method and system

Abstract

The invention provides a method and a system for evaluating time synchronization performance of a wireless sensor network. The method and the system can be used for evaluating the accuracy of system clocks obtained in a time synchronization process of nodes. The method comprises the following steps: constraining the oscillation periods and initial phases of the system clocks of the synchronized nodes according to the obtained counting values of the system clocks of the nodes to obtain optimal estimation of the oscillation periods and the initial phases synchronized by the system of the nodes; and evaluating the time synchronization performance of the nodes according to the obtained optimal estimation of the oscillation periods and the initial phases. The system comprises a plurality of nodes and an external evaluation unit; the external evaluation unit sends requests to the nodes; and after the nodes receive the requests, after a period of short time and response delay which cannot be avoided and is unlikely to be accurately measured, the external evaluation unit collects the response of the nodes and evaluates the synchronized clock performance of the nodes via the method for evaluating time synchronization performance. The method and the system provided by the invention are suitable for the technical field of communications.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a wireless sensor network time synchronization performance evaluation method and system. Background technique [0002] Generally speaking, the clock of a microprocessor includes two components: a clock source and an accumulation timing trigger. Time synchronization is a method to adjust the system clock of the node itself according to the clock deviation between nodes, so that the system clock is the same as the global clock, so that all nodes can achieve synchronization. When the microprocessor is used as a time-synchronized node, in theory, only when the frequency and initial phase of the clock source of all nodes are the same, there is no deviation in the system clock between nodes, and all nodes can maintain synchronization. In fact, when the crystal oscillator is used as the clock source of the microprocessor, its frequency and phase are not fixed because the crystal...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a wireless sensor network time synchronization performance evaluation method and system to solve the existing time synchronization evaluation technology that is difficult to reduce the influence of the uncertain short delay, which makes the evaluation accuracy exist. big error problem

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