A Clock Synchronization Method for Mobile Ad Hoc Networks Based on Time Domain Narrow Pulse

Abstract

The present invention proposes a clock synchronization method for mobile wireless ad hoc networks based on time-domain narrow pulses, comprising the following steps: a. Divide time into continuous clock synchronization cycles of equal length, and set a specific period of time in each clock synchronization cycle as a clock Synchronization window; b, the mobile wireless terminals wait for the opening moment of the clock synchronization window; c, the mobile wireless terminals send time-domain narrow pulses at the central time points of their respective clock synchronization windows, and receive adjacent mobile wireless terminals in the clock synchronization window The time-domain narrow pulse sent by the terminal; d, the mobile wireless terminal counts the arrival time of the time-domain narrow pulse received in the window at the end of the respective clock synchronization window, takes the statistical value as the reference time, and compares the reference time with the clock The center time value of the synchronization window is differenced to obtain the clock correction value and perform clock correction. The present invention does not need to select a central node in the synchronization process, and the clock synchronization process of all nodes in the network is almost simultaneously carried out.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a clock synchronization method for a mobile wireless ad hoc network based on time-domain narrow pulses. Background technique [0002] Most of the current clock synchronization methods for mobile wireless ad hoc networks are master-slave synchronization methods based on frame exchange. For example, in a system with a central clock control node, the requesting synchronization terminal initiates a clock synchronization request frame, and the time service terminal sends a time-stamped clock response frame to the requesting synchronization terminal after receiving it, and the requesting synchronization terminal receives and obtains the clock difference value through simple calculation And calibrate the local clock accordingly. The disadvantage of this system with a central clock node is that the timing terminal as the central node is often selected in advance, which is vulnerabl...

AI Technical Summary

Problems solved by technology

The disadvantage of this system with a central clock node is that the timing terminal as the central node is often selected in advance, which is vulnerable to attack and damage in the wireless ad hoc network environment, so the system is not reliable

Another example is in a clock synchronization system with a dynamic clustering hierarchical structure, although the timing terminal can be dynamically selected, it is necessary to establish and dynamically maintain the clustering hierarchical structure, which will cause a large communication overhead

[0003] In addition, due to the characteristics of the wireless communication environment in the above-mentioned clock synchronization method based on frame exchange, at most one terminal is performing clock synchronization in each time period of each area, and the terminal must perform carrier sense collision avoidance and automatic delay avoidance and other operations, which also makes the clock synchronization efficiency of terminals on the entire network low

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