Wireless Synchronous Triggering Technology for Wireless Measuring System

To test and measure the field signal, the nodes of wireless measuring system are necessarily deployed in the signal source area. The nodes must cooperate with other nodes to sample the field signal at one same time, so the starting sampling action in the system needs one actuate time benchmark. Therefore a special approach based on wireless mode is proposed in this paper to provide the actuate time benchmark for measuring system. This approach is a new cooperative wireless triggering-mechanism based on ldquowaiting-actionrdquo sequence wireless broadcast strategy. The advantage of this approach is that there is no any special triggering wires and all the nodes can be freely deployed anywhere in the signal field compared with wire triggering approach. There is no any special time stamp in our wireless measuring system. The performances of wireless cooperative triggering-mechanism for coordinating all the measuring nodes based on our hardware and software embedded platform were experienced and analyzed. The experiments indicate that the approach can achieve about 200 ns synchronous triggering precision.