A sensor data acquisition and transmission system and method based on PTP synchronization

Abstract

The invention provides a sensor data acquisition and transmission system and method based on PTP synchronization. Through connecting switches in series, the number of the series switches can be customize according to the specific application scenario, the number of the collection nodes attached to each switch can be customized, the number of the sensor channels that each collection node can collect can be customized, the array length is not limited, the process is simple, and the number of the cables is small; The synchronous sampling of ultra-remote distributed sensor data is realized by adopting PTP synchronous protocol, and the synchronous sampling accuracy is high. By adopting the transmission architecture of Gigabit Ethernet and Gigabit Ethernet, the transmission bandwidth is wide, the transmission distance is long, and the data throughput is large; Using Poe Ethernet power supply technology, the service data, synchronous message and power supply are transmitted by Ethernet cable,which simplifies the structure of collection and transmission system. The length of the acquisition array of the whole device is not limited, and the high-precision synchronous acquisition and transmission of each acquisition node can be realized when the large-scale sensor array is acquired.

Description

technical field [0001] The invention relates to the field of data acquisition and transmission, in particular to a sensor data acquisition and transmission system and method based on PTP synchronization. Background technique [0002] The application of distributed data acquisition and transmission technology is very extensive. The most typical application scenarios include data acquisition and transmission of distributed hydrophone data in the wet end of military linear array sonar, data acquisition and transmission of super-large multi-cable and multi-geophone in offshore oil exploration, deep-sea fine-tuning. Cable sonar acquisition transmission detection system, etc. The defects of traditional and existing distributed data acquisition and transmission systems are summarized as follows: First, traditional data acquisition and transmission technologies often use RS485 bus, ATM transmission, custom LVDS transmission, Ethernet plus RS485, and Ethernet plus LVDS architecture. ...

AI Technical Summary

Problems solved by technology

The defects of traditional and existing distributed data acquisition and transmission systems are summarized as follows: First, traditional data acquisition and transmission technologies often use RS485 bus, ATM transmission, custom LVDS transmission, Ethernet plus RS485, Ethernet plus LVDS architecture, these The implementation of architecture engineering application is difficult, the performance is backward, and the reliability is not good. Second, the synchronization method is backward. Most of the existing synchronization methods use an additional communication protocol and use redundant cables to transmit a common system master clock node and synchronization pulse. Or use serial data clock recovery with command delay compensation to achieve small-scale synchronous acquisition

Synchronization accuracy deteriorates with the increase of system scale, does not have the scalability of large-scale systems, and is more complicated to implement, requiring additional software and hardware, which has a negative impact on system reliability. The application in the strict military sonar and seismic oil exploration fields is limited; third, the existing technology does not have ultra-large-scale system data transmission capabilities, and the data throughput and transmission distance are limited; fourth, the existing technology business data, synchronization signals, The clock and power supply must be transmitted by separate cables. There are many cables in the entire system, the connection relationship is complicated, and the process is complicated, which has a negative impact on system reliability.

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