A clock adjustment algorithm based on minimum two multiplexing model

Abstract

The invention discloses a clock modulating algorism based on minimum square law pattern, which comprises the following steps: building mathematical model of phase difference; adopting phase-detector result of front N s to control the frequency of high-stability crystal per s; reserving the phase-detector result as parameter of next second preestimation; compensating the accumulated phase difference through 2 delta phase-detector result; controlling the frequency fluctuation of high-stability crystal within little scale; affirming the output precision of clock.

Description

technical field [0001] The invention relates to a clock adjustment algorithm based on a least square method model, which can be used for clock equipment that provides a high-precision clock source by using a modified high-stable crystal method, and belongs to the technical field of communication. Background technique [0002] The digital synchronous network is the basis for the normal operation of the digital communication network, and it is also an important means to ensure the operation quality of various business networks. It is listed as the three supporting networks of the telecommunication network together with the telecommunication management network and the signaling network, and plays a pivotal role in the telecommunication network. [0003] For any communication device, a clock is required to provide its operating frequency, so the clock performance is an important aspect that affects the performance of the device. The clock is often referred to as the heart of th...

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Problems solved by technology

[0011] In order to solve the above two problems, one method is to use several different satellite clock systems such as: GPS system and GLONASS system for mutual comparison and verification to improve the accuracy and reliability of the clock. This method is complicated to implement and high in cost. One method is to use the GPS clock to synchronize the watch (atomic clock, crystal oscillator clock or CPU internal clock). During normal operation, the GPS clock is used to correct the watch. When the GPS is out of sync, the watch is used to replace the GPS clock.

When the crystal oscillator clock or CPU internal clock is used as the watch, this method can only eliminate the large deviation caused by the short-term loss of GPS lock, but cannot eliminate the small deviation caused by SA interference, etc.

To improve the clock accuracy, it is necessary to use an atomic clock with a higher precision than the GPS clock for synchronous comparison and monitoring of the GPS clock. This method is expensive and difficult to popularize.

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