Time synchronization system and method for network instruments

Abstract

The invention discloses a time synchronization system and method for network instruments. The system comprises a tree-shaped instrument gateway, a control center, and the network instruments, wherein the control center is connected with a root node of the tree-shaped instrument gateway; the network instruments are connected with leaf nodes of the tree-shaped instrument gateway; the tree-shaped instrument gateway is composed of a main instrument gateway positioned at a root node position of the tree-shaped instrument gateway, and branch instrument gateways connected with the main instrument gateway; the control center communicates with the main instrument gateway via an Ethernet communication module; and the main instrument gateway is connected with a GPS time source used for synchronizing a local clock; and the method comprises the following steps: 1, synchronizing a time of the main instrument gateway; 2, synchronizing a time of an ith layer of the instrument gateways; 3, repeating the step 2 for N times till a time synchronization process of an Nth layer of the instrument gateways is finished; and 4, synchronizing a time of the network instruments. According to the time synchronization system and method disclosed by the invention, the design is original, the data transmission interference among the network instruments is reduced, and the network transmission efficiency and the time synchronization precision are improved.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, and in particular relates to a time synchronization system and method for network instruments. Background technique [0002] The rapid development of computer technology, microelectronics technology and network technology has continuously promoted the transformation of measuring instruments towards digitalization and intelligence. The working mode of measuring instruments has also developed from the early independent work of a single instrument to the collaborative work of multiple intelligent instruments. Nowadays, in some key fields, such as navigation, aerospace, national defense, etc., the large-scale automatic test system used may contain hundreds or thousands of intelligent instruments. In order to ensure the efficient and stable operation of the entire test system, the connection bus between these instruments is particularly important. The existing network instrument system th...

AI Technical Summary

Problems solved by technology

The existing network instrument system that uses Ethernet as the connection bus generally adopts a planar structure, and the control center and all network instruments are connected to the communication bus. Refer to figure 1 , figure 1 It is a schematic diagram of the structural connection of the time synchronization system used in the prior art. This structure has the following disadvantages: first, each network instrument only needs to transmit the measurement data to the control center, and does not need to be transmitted to other instruments. When the control center uploads the measurement data, it should try not to affect the communication between other instruments and the control center. However, the Ethernet bus adopts the carrier sense multiple access protocol with collision detection. If one instrument in the network is sending data, other instruments need data Send immediately, but also have to wait. When a large number of network instruments are connected to the network, the network transmission efficiency will be seriously reduced. At this time, whether it is general measurement data or the more important time synchronization information for the system, the network cannot guarantee timely Accurate transmission; Second, each instrument connected in the network must adopt the same time synchronization protocol, otherwise the unified time synchronization of the whole network cannot be completed

Images