In the wireless sensor networks test system

in order to test the accuracy of the test subjects

the time synchronization is very essential.According to the GPS timing principle

GPS seconds pulse is used to trigger control system and broadcasting signal of synchronization trigger.At the same time the sensor nodes receive the signal to make clock synchronization trigger

clock calibration and test events to trigger by the synchronization acquisition.Through the test verification

the event trigger synchronization error between the sensor nodes is about 1 μs

and is has high reliability

and can be widely used in aviation navigation and so on.