CN114124277A - Time service system and method based on local bus between terminals - Google Patents
Time service system and method based on local bus between terminals Download PDFInfo
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- CN114124277A CN114124277A CN202111265710.3A CN202111265710A CN114124277A CN 114124277 A CN114124277 A CN 114124277A CN 202111265710 A CN202111265710 A CN 202111265710A CN 114124277 A CN114124277 A CN 114124277A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
Abstract
The utility model discloses a time service system and method based on local bus between terminals, comprising an intelligent gateway and a plurality of terminals; a power supply bus is connected between the intelligent gateway and the plurality of terminals in a local bus mode; the intelligent gateway comprises a time service master module, the terminal comprises time service slave modules, and a time service bus is connected between the time service master module and the plurality of time service slave modules in a local bus mode; the time service main module is configured to: the method has the advantages that the time service information of the external optical fiber or the Beidou is obtained, the time service slave module is subjected to time service through the time service bus, the precision of the time service slave module can be precisely time service for monitoring equipment on the power system bus, the precision can reach +/-50 ns, and one-to-many management can be realized through a local bus mode.
Description
Technical Field
The disclosure belongs to the technical field of network time service, and particularly relates to a time service system and method based on a local bus between terminals.
Background
In the field of power monitoring, a precise time service system plays a crucial role in positioning power faults. However, the traditional precise time service cannot be introduced into the electric power tunnel (for example, Beidou signals and the like cannot be transmitted into the tunnel), and many monitoring devices do not have the precise time service capability.
The inventor of the present disclosure finds that the time service through the NTP or 485 network terminal protocol is poor in time precision, and the collected data cannot be further analyzed in combination with the high-precision timestamp; and the high-precision time service based on the optical fiber cannot cover each monitoring device.
Disclosure of Invention
The invention provides a time service system and a method based on a local bus between terminals, which can realize precise time service of monitoring equipment on a power system bus, wherein the precision can reach + -50ns, and one-to-many management can be realized through a local bus mode.
In order to achieve the above object, in a first aspect, the present disclosure provides a time service system based on a local bus between terminals, which adopts the following technical solutions:
a time service system based on a local bus between terminals comprises an intelligent gateway and a plurality of terminals; a power supply bus is connected between the intelligent gateway and the plurality of terminals in a local bus mode;
the intelligent gateway comprises a time service master module, the terminal comprises time service slave modules, and a time service bus is connected between the time service master module and the plurality of time service slave modules in a local bus mode;
the time service main module is configured to: and acquiring time service information of an external optical fiber or the Beidou, and performing time service on the time service slave module through a time service bus.
Further, the intelligent gateway is a protocol switching gateway, and is used for power supply and communication protocol conversion of the terminal.
Further, the terminal is set as a monitoring device in the tunnel.
Further, the time service bus is set to be a differential bus.
Further, the time service main module comprises an uplink time service interface.
Furthermore, the time service main module further comprises a time service circuit, a pulse edge capturing circuit, a time information output serial port, a clock module, a single chip microcomputer and a temperature compensation crystal oscillator.
Furthermore, the time service slave module comprises a time service circuit, a pulse edge capturing circuit, a time information output serial port, a clock module, a single chip microcomputer and a temperature compensation crystal oscillator.
Further, the highest main frequency of the clock module is 128M, pulse edge timestamp capture with the highest precision of 8ns is supported, and frequency calibration and time calibration are supported.
Furthermore, a star-shaped connection mode is adopted between the time service master module and the plurality of time service slave modules.
In order to achieve the above object, in a second aspect, the present disclosure further provides a time service method based on a local bus between terminals, which adopts the following technical solution:
a time service method based on an inter-terminal local bus, which employs the time service system based on an inter-terminal local bus according to the first aspect, and includes:
the frequency calibration is carried out on the time service slave module through the time service master module, so that the time service master module and the time service slave module have the same frequency;
the time service slave module is subjected to time synchronization calibration through the time service master module, so that the time service master module and the time service slave module have the same time;
and the time service master module and the time service slave module are subjected to offset delay calibration, so that the calibration of the transmission delay of signals from the time service master module to the time service slave module is realized.
Compared with the prior art, the beneficial effect of this disclosure is:
according to the method, the one-to-many management can be realized by a local bus mode when the precise time service of the monitoring equipment on the power system bus is realized, and the collected data is further analyzed by combining a high-precision timestamp; furthermore, the power failure is positioned, so that the safe and stable operation and power supply of the power system are guaranteed.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
Fig. 1 is a system architecture of embodiment 1 of the present disclosure;
fig. 2 is a block diagram of an intelligent gateway according to embodiment 1 of the present disclosure;
fig. 3 is a block diagram of a terminal according to embodiment 1 of the present disclosure;
fig. 4 is a precision timing flowchart according to embodiment 2 of the present disclosure.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
Example 1:
the embodiment provides a time service system based on a local bus between terminals, which comprises an intelligent gateway and a plurality of terminals, wherein the system intensively and precisely services the plurality of terminals on the bus through the intelligent gateway.
In this embodiment, the intelligent gateway is a protocol exchange gateway, is used for power supply and communication protocol conversion of a terminal, and includes a time service main module; and the time service main module of the intelligent gateway acquires precise time service through optical fiber time service or Beidou time service.
In this embodiment, the terminal refers to a monitoring device in a tunnel, and is connected to the intelligent gateway through a bus, including a time service slave module.
The time service master module carries out precise time service on the time service slave module through a time service bus, and preferably, the time service bus adopts a high-speed differential bus.
As shown in fig. 2, the time service main module includes an uplink time service interface, a high-speed differential bus-based precision time service circuit, a high-precision pulse edge capture circuit, a time information output serial port, a precision clock module, a low-power consumption MCU, and a high-precision temperature compensation crystal oscillator.
As shown in fig. 3, the time service slave module includes a high-speed differential bus-based precise time service circuit, a high-precision pulse edge capture circuit, a time information output serial port, a precise clock module, a low-power consumption single chip Microcomputer (MCU), and a high-precision temperature compensation crystal oscillator.
In this embodiment, the time service master module has one more uplink time service interface than the time service slave module, and is configured to receive precise time service information from an optical fiber or the beidou.
The precision time service circuit based on the high-speed differential bus adopts a differential bus mode; the time service master module carries out time service processing on the time service slave module and supports a bus type and star type connection mode.
The high-precision pulse edge capturing circuit can capture pulse edge information from the time service bus by the time service module and acquire a timestamp, the pulse edge can be set as a rising edge or a falling edge, the high-precision clock module can record the current time as an event timestamp at the edge capturing moment, and the captured high-precision timestamp information is sent to the monitoring equipment or the terminal through the timestamp information output serial port.
And the time stamp information output serial port is used for reading or configuring the time service module information.
The precision clock module is the core realized by the embodiment, the highest main frequency 128M of the chip supports capturing of the pulse edge timestamp with the highest precision of 8ns, and supports frequency calibration and time calibration.
The low-power consumption MCU provides basic management functions.
The temperature compensation crystal oscillator adopts a high-precision temperature compensation crystal oscillator, and the precision of the local clock is further improved.
Specifically, precision time service is performed by calibrating the frequency of a slave time service module of a terminal, calibrating the absolute time of the slave time service module and calibrating master-slave offset delay through a master time service module of the intelligent gateway; the master time service module of the intelligent gateway calibrates the frequency of the slave time service module of the terminal, so that the master time service module and the slave time service module have the same frequency; the absolute time calibration of the slave time service module of the terminal is carried out, so that the master time service module and the slave time service module have the same time; and calibrating the master-slave offset delay to realize the calibration of the transmission delay of the signal from the master time service module to the slave time service module.
Example 2:
this embodiment provides a time service method based on an inter-terminal local bus, which employs the time service system based on an inter-terminal local bus according to the first aspect, and includes:
the frequency calibration is carried out on the time service slave module through the time service master module, so that the time service master module and the time service slave module have the same frequency;
the time service slave module is subjected to time synchronization calibration through the time service master module, so that the time service master module and the time service slave module have the same time;
and the time service master module and the time service slave module are subjected to offset delay calibration, so that the calibration of the transmission delay of signals from the time service master module to the time service slave module is realized.
As shown in fig. 4, the specific process is as follows:
(1) opening a main module to give time pulse:
the time service master module sends a pulse to the time service slave module at regular time through a high-speed differential bus, the period is once every 1 second, and the duty ratio is 50%;
(2) receiving a time service pulse from the module:
after the time service slave module is electrified, the high-speed differential bus time service receiving circuit is automatically opened to receive time service pulses;
(3) the slave module calibrates the local frequency:
receiving a second pulse sent by a bus, receiving the time service pulse through a time service circuit, triggering and recording timestamps of the two pulses, reading the timestamps of the two pulses, processing a difference value, compensating to the frequency of a precision clock module, and adjusting the frequency;
(4) master-slave time delay calculation:
between the master module and the slave module, because of the reason of lines and devices, a delay exists when a signal is transmitted from the master module to the slave module, and the delay needs to be compensated into the precise time service module by the time service slave module; after the equipment is installed, the line is fixed, and the offset delay is fixed when the topological structure of the line is not changed, so that the processing is only carried out when the equipment is electrified for the first time; the Offset Delay needs to be completed by the master node and the slave node (time service module) together, the master node sends a pulse to the slave node, the master node and the slave node record time TM1 (master node sending time) and TS1 (slave module receiving time), the slave node sends a pulse to the master node, the master node and the slave node record occurrence time TM2 (master node receiving time) and TS2 (slave module sending time), the time Offset of the master node and the slave node is denoted as Offset, the Delay in line transmission is Delay, and assuming that the Delay of signals from the master module to the slave module and from the slave module to the master module is fixed, the following formula can be obtained:
TS1–TM1＝Offset+Delay (1)
TM2–TS2＝Delay–Offset (2)
from the above formula, one can obtain:
Offset＝(TS1+TS2–TM1–TM2)/2 (3)
Delay＝(TS1–TM1+TM2–TS2)/2 (4)
after the offset and the delay from the master node to the slave node can be calculated, the time of the slave node is corrected, and the time synchronization of the slave node and the master node is completed after the correction is completed;
(5) and (3) periodically calibrating the absolute time of the precision clock module:
receiving the second pulse sent by the bus, triggering and recording the time stamp of the second pulse, reading the time stamp of the second pulse, calculating the difference value with the whole second, compensating the difference value to the clock, and finishing the time calibration of the whole second. Receiving a clock sent by a time service bus, and putting the clock into a precision clock module to enable the module to generate accurate time of ns level;
(6) at regular intervals, recalibrate frequency:
since the frequency of the crystal oscillator is not constant, and the temperature, the environment and the like are aligned to cause offset, the frequency is recalibrated at regular intervals, and the interval time is configurable.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. A time service system based on a local bus between terminals is characterized by comprising an intelligent gateway and a plurality of terminals; a power supply bus is connected between the intelligent gateway and the plurality of terminals in a local bus mode;
the intelligent gateway comprises a time service master module, the terminal comprises time service slave modules, and a time service bus is connected between the time service master module and the plurality of time service slave modules in a local bus mode;
the time service main module is configured to: and acquiring time service information of an external optical fiber or the Beidou, and performing time service on the time service slave module through a time service bus.
2. The system of claim 1, wherein the intelligent gateway is a protocol switching gateway for converting the power supply and communication protocols of the terminals.
3. The system of claim 1, wherein the terminals are configured as monitoring devices within tunnels.
4. The inter-terminal local bus based time service system of claim 1, wherein the time service bus is configured as a differential bus.
5. The system according to claim 1, wherein the master timing module includes an upstream timing interface.
6. The time service system based on the local bus between the terminals as claimed in claim 5, wherein the time service main module further comprises a time service circuit, a pulse edge capture circuit, a time information output serial port, a clock module, a single chip microcomputer and a temperature compensation crystal oscillator.
7. The time service system based on the local bus between the terminals as claimed in claim 1, wherein the time service slave module comprises a time service circuit, a pulse edge capture circuit, a time information output serial port, a clock module, a single chip microcomputer and a temperature compensation crystal oscillator.
8. The time service system based on the local bus between the terminals as claimed in claim 6 or 7, wherein the highest master frequency of the clock module is 128M, IO level timestamp capture with the highest precision of 8ns is supported, and frequency calibration and time calibration are supported.
9. The system according to claim 1, wherein the time service master module and the plurality of time service slave modules are connected in a star-type manner.
10. A time service method based on an inter-terminal local bus, characterized in that the time service system based on the inter-terminal local bus according to any one of claims 1-9 is adopted, comprising:
the frequency calibration is carried out on the time service slave module through the time service master module, so that the time service master module and the time service slave module have the same frequency;
the time service slave module is subjected to time synchronization calibration through the time service master module, so that the time service master module and the time service slave module have the same time;
and the time service master module and the time service slave module are subjected to offset delay calibration, so that the calibration of the transmission delay of signals from the time service master module to the time service slave module is realized.
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