A Clock Synchronization System without Error Accumulation for Wireless Sensor Networks

Abstract

The invention provides an error accumulation free clock synchronization system applied to the wireless sensor network. The system comprises a clock synchronization algorithm and intelligent agent equipment. The intelligent agent equipment serves as a carrier of the clock synchronization algorithm, and the clock synchronization algorithm is run in the intelligent agent equipment. The clock synchronization algorithm includes a relative gradient estimation algorithm, a gradient compensation algorithm, a phase compensation algorithm, a time delay compensation algorithm and a virtual clock generation algorithm; and the intelligent agent equipment includes a data transmitting-receiving module, a transmitting-receiving time stamp marking module, a core control module, an algorithm calculation module and a synchronous time service module. According to the system, influence of transmission time delay on the clock synchronization precision can be inhibited effectively, clock synchronization canbe realized among different intelligent agent equipment, the system has the advantages that the synchronization precision is high, errors are not accumulated, the computational complexity is low and the program coupling factor among the equipment is low, time service is provided by outputting the synchronous second pulse and synchronous virtual time at the same time, and the system is also higherin practicality and wider in application range.

Description

[0001] Field [0002] The invention belongs to the technical field of clock synchronization, and in particular relates to a clock synchronization system without error accumulation between intelligent body devices in a wireless sensor network. Background technique [0003] Wireless sensor network is a typical distributed network system, and it is a strategic high technology with interdisciplinary nature for both military and civilian use. It is widely used in the fields of national defense and military, environmental monitoring, power system dispatching, traffic management and disaster prediction, etc., and has huge application potential and development space. For many basic functions of wireless sensor networks, such as event timing judgment, target positioning, data fusion, network cooperative sleep, etc., all need to be completed under the global common clock. The higher the synchronization accuracy of the common clock, the better the overall performance of the network. Th...

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Problems solved by technology

[0008] Purpose of the invention: To provide a wireless sensor network with a clock synchronization system without error accumulation to overcome the low synchronization accuracy of the existing clock synchronization system, the slope is not compensated, the synchronization accuracy is unstable, the calculation amount is large, and the phase compensation Quantity divergence, high degree of program coupling between intelligent devices, no effective compensation for data packet transmission delay, cumbersome timing process, high power consumption of the system, poor practicability, etc.

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