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Communication Dans Un Congrès Année : 2006

Synchronization of wireless sensors : review of methodologies. Experience feedback of the very precise GPS solution

Résumé

Measuring numerous or various physical parameters all along a structure often implies that collected data should be compared or correlated by a central process unit (that ensures the structure assessing or controlling). That typical configuration of a sensors’ distribution and particularly wireless sensors network, underlines the need of precise relative or absolute time stamping of each measurement. Unfortunately, each sensor of a network is an electronic entity whose time- base varies because of many factors ( its own quartz drift, temperature influence, age, etc.). Thus, a synchronization mechanism is needed to reach a time stamping that suits the required precision. The level of precision in sensor synchronization is directly determined by the SHM need (from few seconds for temperature to micro-seconds for acoustic wave propagation). Many topologies could be considered but a review of the appropriate and case- dependent methodologies is proposed. The simplest case where each sensor directly measures and transmits data to a supervisor that ensures the final time-stamping is limited because this supposed a determinist knowledge of the delay due to acquisition and the RF transmission (moreover, this configuration excludes local signal processing like those embedded in smart sensors). Two other topologies are analyzed. First, the topology where a supervisor performs and distributes a synchronization mechanism through the sensor network. This could be achieved by means of appropriate network time protocols or by the exchange of specific packets for sensor time-base reset or synchronization. Another topology consists in an embedded synchronization mechanism; each sensor manages its own and absolute time-base
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Dates et versions

hal-04473787 , version 1 (22-02-2024)

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  • HAL Id : hal-04473787 , version 1

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Vincent Le Cam, Laurent Lemarchand, Louis-Marie Cottineau. Synchronization of wireless sensors : review of methodologies. Experience feedback of the very precise GPS solution. European Workshop on Structural Health Monitoring, Jul 2006, Granada (Spain), Spain. pp.1339-1347. ⟨hal-04473787⟩
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