A cascade synchronous data acquisition and transmission system based on a PTP protocol

Abstract

The invention provides a cascaded synchronous data acquisition and transmission system based on a PTP protocol. The cascaded synchronous data acquisition and transmission system comprises a data server, a plurality of PTP switches and a plurality of node linear arrays, a plurality of PTP switches are connected in series to form a core line. Wherein the plurality of node linear arrays are respectively connected with any PTP switch on the core line, and the head end PTP switch of the core line is connected with the data server. The integrated design is adopted, so that the acquisition node integrates a PTP message transparent relay forwarding function, the system structure is simplified, the system reliability is improved, the system power consumption is reduced, and the high synchronizationprecision of the whole system is achieved; a PTP synchronization protocol and PTP master and slave clocks are adopted, so that the submicrosecond clock synchronization precision between each node ofthe system and a data server can be realized; the uplink network port and the downlink network port of the acquisition node can realize low-power-consumption long-term operation through adaptive bandwidth.

Description

technical field [0001] The invention relates to the field of data signal processing, in particular to a cascade synchronous data acquisition and transmission system based on the PTP protocol. Background technique [0002] Distributed synchronous data acquisition and transmission technology is widely used. Typical application scenarios include military linear array sonar wet-end distributed hydrophone data acquisition and transmission, offshore oil exploration ultra-large-scale multi-cable geophone data acquisition and transmission, and deep-sea thin cable sonar acquisition and transmission. detection system, etc. The existing distributed data acquisition and transmission system has the following defects: 1) Most of the existing systems adopt the architecture of RS485 bus, ATM transmission, self-defined LVDS transmission, Ethernet plus RS485, Ethernet plus LVDS, and the system architecture is more complicated. It is difficult to implement and apply, with backward performance...

AI Technical Summary

Problems solved by technology

The existing distributed data acquisition and transmission system has the following defects: 1) Most of the existing systems adopt the architecture of RS485 bus, ATM transmission, self-defined LVDS transmission, Ethernet plus RS485, Ethernet plus LVDS, and the system architecture is more complicated. It is difficult to implement and apply, with backward performance and poor reliability. It cannot meet the needs of networked and full digitalization in the field of sonar detection in the future, nor can it meet the needs of ultra-long-distance transmission of massive data in the field of oil exploration; 2) The synchronization method is backward, and the synchronization acquisition is distributed However, the existing synchronization methods have their deficiencies; such as adopting additional communication protocols and using redundant cables to transmit a common system master clock and synchronization pulse, or using serial data clock recovery Cooperate with the method of command delay compensation to realize small-scale synchronous acquisition; the synchronization accuracy of the above synchronization methods becomes worse with the increase of the system scale, does not have the scalability of large-scale systems, and is more complicated to implement, requiring additional software The hardware cooperation will have a negative impact on the system reliability; the PTP protocol and the PTP switch are used to realize the synchronization of interconnected devices. This method has high scalability but requires an additional expensive PTP switch, and the cost and power consumption of the system will be significant. improve

Images