Clock calibration method of wireless meter reading system and clock calibration method of distributed system

A clock calibration and wireless meter reading technology, applied in the field of wireless communication, can solve the problems of clock errors, the system cannot be corrected, and the accuracy of the group clock cannot be guaranteed, so as to ensure no conflict, solve clock deviation, and ensure clock accuracy. Effect

Inactive Publication Date: 2011-07-20
上海复展智能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The clocks of each gas meter module always have errors, and the accumulation of errors is very considerable. For example, the difference is 1S every day, and the difference is 30S in a month. How to solve the cumulative error
[0006] 2. In the gas ...

Method used

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  • Clock calibration method of wireless meter reading system and clock calibration method of distributed system
  • Clock calibration method of wireless meter reading system and clock calibration method of distributed system

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Embodiment 1

[0041] see figure 1 , the present invention discloses a clock calibration method for a wireless meter reading system. The wireless meter reading system includes several management servers, several hand-held meter reading machines, and several gas meters (of course other meter bodies); according to the installation of the gas meter The location divides the plurality of gas meters into multiple groups, and each group includes a main module and several sub-modules.

[0042] The clock calibration method includes:

[0043] Initially, set the time for each gas meter in the group through the hand-held meter reading machine with the standard clock;

[0044] Regular communication at the set time period every night is initiated by the main module of each group. The main module sends its own clock to each sub-module, and the sub-module immediately updates its own time with the received time;

[0045] The hand-held meter reading machine with a standard clock is synchronized with the gas...

Embodiment 2

[0052] This embodiment discloses a clock calibration method for a wireless meter reading system. The wireless meter reading system includes several handheld meter reading machines and several gas meters; the several gas meters are divided into multiple groups according to the installation positions of the gas meters. Each group includes a main module and several submodules.

[0053] The clock calibration method includes:

[0054] Initially, approve the time for each gas meter in the group;

[0055] In the set time period, the regular communication calibration time is initiated by the main module of each group. The main module sends its own clock to each sub-module, and the sub-module immediately updates its own time with the received time;

[0056] Calibrate the handheld meter reading machine before synchronizing the time with the gas meter. The hand-held meter reading machine with a standard clock is synchronized with the gas meter. The gas meter saves the clock of the hand...

Embodiment 3

[0061] The difference between this embodiment and the above embodiments is that in this embodiment, the clock calibration method can not only be used for clock calibration of a wireless meter reading system, but can also be used for other distributed systems.

[0062] A clock calibration method for a distributed system, the distributed system includes several groups, each group includes a main module and some sub-modules; the clock calibration method includes:

[0063] In the set time period, the regular communication calibration time is initiated by the main module of each group. The main module sends its own clock to each sub-module, and the sub-module immediately updates its own time with the received time;

[0064] The time synchronization unit with the standard clock is synchronized with the watch body, the watch body saves the time synchronization unit clock, does not update immediately, the watch body still runs with the old clock, and records the error between the time ...

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Abstract

The invention discloses a clock calibration method of a wireless meter reading system. The method comprises the following steps of: carrying out timed communication for time calibration in a set time interval, wherein a main module of each group initiates the timed communication and sends self time to each submodule, and the submodule immediately updates individual time with the received time; synchronizing time between a hand-held meter reading machine with a standard clock and a meter body, storing the clock of the hand-held meter reading machine by the meter body, and recording the offset between the clock of the hand-held meter reading machine and a old clock, wherein the meter body still operates with a old clock without immediate update; synchronizing time between the hand-held meter reading machine and the main module in each group; starting timed relay communication by each main module by adopting the old clock in a time calibration interval right after time synchronization, and sending a new clock to all submodule members in the group through a clock calibration command, wherein the new clock is subsequently adopted in the whole group. The clock calibration method of the wireless meter reading system, which is proposed by the invention, can be used for eliminating clock offset in the groups of the meter body to ensure the clock accuracy in the groups and effectively avoid timed communication conflicts.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a wireless meter reading system, in particular to a clock calibration method of the wireless meter reading system; at the same time, the invention also relates to a distributed system clock calibration method. Background technique [0002] In a distributed system, each module has its own time. When the distributed system adopts the fixed time communication method, it is necessary to ensure that the time of each module is consistent to ensure the reliability of communication. [0003] A wireless meter reading system includes several management servers, several handheld meter reading machines, and several gas meters, and is divided into N groups according to the installation locations of the gas meters. Each group uses a fixed-time communication method. At a fixed time every day, the main module of the group initiates communication, and the sub-module responds. It is nece...

Claims

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Application Information

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IPC IPC(8): G04G13/02G04G5/00G01F15/06G04R20/00
Inventor 刘荣鑫宋奕高艺林锋
Owner 上海复展智能科技股份有限公司
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