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Equipment clock error detection method based on Ethernet network

A device clock and device technology, applied in time division multiplexing systems, electrical components, multiplexing communications, etc., can solve problems such as inconsistent timing accuracy, uncertain host clock error values, and adverse effects on real-time performance. achieve the effect of ensuring correct execution

Pending Publication Date: 2021-12-03
CHINA SHIP DEV & DESIGN CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the equipment belonging to the ship information system and the time system equipment of the whole ship synchronize the clock time through many different methods, but the time synchronization accuracy of different equipment is inconsistent, and there is a positive or negative error with the time reference value, which leads to differences between different equipment. The clock error value of the host computer is uncertain, and the cumulative error value of the host clocks of the two devices may be relatively large, which will have a negative impact on application services that require high real-time performance and timing accuracy, such as ship information system tracking and detection.

Method used

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  • Equipment clock error detection method based on Ethernet network
  • Equipment clock error detection method based on Ethernet network
  • Equipment clock error detection method based on Ethernet network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a device clock error detection method based on an Ethernet network, and the specific implementation process is as follows:

[0024] (1) if figure 1 As shown, the data transmission detection model of the ship information system is established, and the data transmission process of the test object of the ship information system is abstractly described. The equipment belonging to the ship information system is directly connected to the network switch of the ship information system, and the network communication between the time system equipment and the equipment under test; The network message received by the host of a typical device under test will pass through the physical layer and operating system layer of the host, and then be received and processed by the application layer program of the host;

[0025] (2) Design the detection message used for the clock error test. The detection message is divided into two types: test message and feedback mess...

Embodiment 2

[0036] The detection message is divided into a test message and a feedback message, and the structure of the message is shown in Table 1:

[0037] Table 1 Detection packet structure

[0038] Total Length Message ID (Message ID) Sender IP address (Source-id) H Sender IP address (Source-id)L Receiver IP address (Destination-id)H Receiver IP address (Destination-id)L Timestamp H TimestampL

[0039] in,

[0040] (1) The total length of the message (Total Length): the length is 16 bits, indicating the length of the entire message (including its own 2 bytes), in bytes (Byte);

[0041] (2) Message ID (Message ID): the length is 16 bits, the message ID of the test message is set to 0xFFF1, and the message ID of the feedback message is set to 0xFFF2:

[0042] (3) Sending party IP address (Source-id) and receiving party IP address (Destination-id): respectively represent the IP address of the sending party and the IP address of the rece...

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Abstract

The invention discloses an equipment clock error detection method based on an Ethernet network, and belongs to the field of integrated design of a water surface ship information system. The method comprises the following steps: sending a clock detection message to detected equipment through timing system equipment by utilizing the existing Ethernet network of the ship information system, detecting an error value between a detected equipment clock and a timing system equipment clock, and feeding back an error value to related equipment for the related equipment to carry out time compensation processing during data calculation. The error value can be used for monitoring the time synchronization state of the equipment by the ship information system, and is a reference basis for mastering the working state of each equipment by the ship information system; and the error value can be fed back to related equipment of the time high-sensitivity service, so that the equipment can carry out clock information compensation correction on received target information, control commands and other information, and correct execution of the service is ensured.

Description

technical field [0001] The invention belongs to the field of integrated design of surface ship information systems, and more specifically relates to a device clock error detection method based on an Ethernet network. Background technique [0002] At present, the Ethernet network is widely used in the ship information system, and each Internet-connected device mainly completes the transmission and interaction of various business information through the network. In order to ensure the clock accuracy of each Internet-connected device, each Internet-connected device performs clock synchronization with the time system equipment of the whole ship in different ways. [0003] The equipment belonging to the ship information system completes data transmission such as detection information, command commands, and control commands through the Ethernet network. The time stamp information of the host clock of the equipment is marked in the information messages exchanged between different e...

Claims

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0682
Inventor 蔡奕慰吕遐东张岿张凯于侃
Owner CHINA SHIP DEV & DESIGN CENT