A Clock Synchronization Method
A clock synchronization and clock technology, applied in the field of communication, can solve problems such as expensive cost, insignificant synchronization problems, and achieve the effect of saving costs
Active Publication Date: 2016-05-25
上海傲蓝信息科技有限公司
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Because military network equipment can be configured with precise clock sources such as GPS or obtain accurate time service from base stations (such as the military time service of Shaanxi Astronomical Observatory in my country, the military time service station of South Carolina in the United States, etc.), synchronization problems are not prominent, but they are all at high cost. achieve
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0019] The clock synchronization method of the present invention comprises the following steps:
[0020] defining a first clock, the first clock includes a running rate and a local offset;
[0021] Set up several measurement nodes, any node at least sends its own clock estimation message to neighbor nodes; where:
[0022] τ i (t) = α i t+β i
[0023] where τ i is the local clock reading, α i is the local clock slope, which determines the clock running speed; β i is the local clock offset, since it is impossible for the node to obtain the absolute reference time, the parameter α cannot be calculated i and beta i . However, indirect information can be obtained by measuring the local clock of node i relative to another node j. In fact, sub...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a clock synchronization method which comprises the following steps: defining a first clock, arranging a plurality of measurement nodes, wherein the measurement nodes are sequentially arranged in an adjacent mode, and any measurement node at least transmits self clock estimation information to an adjacent neighbor node, defining a local clock slope and conducting relative slope estimation on the local clock slope, wherein the slope is used for determining the operation speed of the clock, defining a second clock relative to the first clock, setting the second clock to be a random number, and obtaining the slope of the measurement nodes and the slope of the first clock by referring the second clock, and conducting slope compensation on the second clock. The clock synchronization method has the advantages that a virtual time is jointly identified to be the coincident time, and then synchronization can be achieved. Due to the network topology distributed characteristic, if the time of the 2-jumping neighborhood is coincident, the time of the whole network can be inevitably coincident, and the cost is effectively saved.
Description
technical field [0001] The invention relates to the communication field, in particular to a clock synchronization method. Background technique [0002] In order to avoid the problem of precise time synchronization, traditional multi-hop networks generally adopt competition-based MAC schemes, such as SMC, T-MAC, etc., and adopt hop-by-hop periodic synchronization schemes. Therefore, the synchronization overhead is large, the network channel utilization rate is low, and the network delay is large. Since the 1980s, the third-generation military tactical packet network (3GALE, now called data link) has widely adopted the hybrid MAC scheme in order to improve channel utilization, reduce network delay, and accurately locate, thus requiring precise time synchronization. Because military network equipment can be configured with precise clock sources such as GPS or obtain accurate time service from base stations (such as the military time service of Shaanxi Astronomical Observatory i...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
Inventor 黄劲草陈力军陈华玮糜军钱彦立
Owner 上海傲蓝信息科技有限公司