Clock servo method for correcting IEEE 1588 protocol by using adaptive filter

Abstract

The invention discloses a clock servo method for correcting an IEEE (Institute of Electrical and Electronic Engineers) 1588 protocol by utilizing an adaptive filter, which is used for solving the problem of poor synchronization precision of clock synchronization by utilizing a pure software mode in a wireless ad hoc network. According to the method, time delay and offset calculated by a system areprocessed by a self-adaptive filter, a filtering output result is fed back to the system, and a closed-loop clock servo method is formed by combining a PID controller. The self-adaptive filter continuously adjusts the filter coefficient, so that the unique target can be achieved along with the fluctuation of the wireless environment: the time delay is minimized, and meanwhile, the convergence speed of the system can be accelerated to a certain extent. Therefore, the problems of instability and overlong delay in the wireless ad hoc network are solved under the condition of not increasing additional hardware.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a clock servo method for correcting IEEE1588 protocol by using an adaptive filter. Background technique [0002] The IEEE 1588 protocol is a high-precision network clock synchronization protocol. In theory, its synchronization accuracy can reach the sub-microsecond level. It is worth noting that the traditional IEEE 1588 protocol selects the time stamp at the physical layer, and is equipped with an additional clock crystal oscillator. At the same time, based on a wired environment with symmetric paths, these conditions ensure synchronization accuracy. However, in the wireless ad hoc network environment, due to problems such as large network fluctuations, asymmetric communication paths, and resource limitations, the synchronization accuracy of the IEEE 1588 protocol in the wireless environment can only reach the second level. Considering the high cost of ad...

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem of low clock synchronization accuracy caused by large network fluctuations, asymmetric communication paths, and limited network resources in wireless ad hoc networks, the present invention proposes a method for correcting IEEE 1588 protocols using adaptive filters. Clock servo method, the time offset and frequency offset generated by each synchronization pass through the clock servo system composed of adaptive filter, PID controller, etc., and achieve higher synchronization accuracy through feedback, iteration, and correction

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