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The Study on Self-adaptive Locked Technique of Oven Controlled Crystal Oscillator

Author: MaYanQing
Tutor: YuJianGuo
School: Xi'an University of Electronic Science and Technology
Course: Detection Technology and Automation
Keywords: OCXO (OCXO) GPS Kalman filtering Tame maintained
CLC: TN967.1
Type: Master's thesis
Year: 2011
Downloads: 132
Quote: 1
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Abstract


Studied based the the GPS second signal OCXO (OCXO) tame maintain technology , the technology combination of the long-term stability and accuracy of the GPS signal and crystal short-term stability , and greatly improve the performance of the frequency source , with a wide range of applications fields. In this design, the received first 1PPS signal pre-processing, to eliminate inclusions pseudo pulse signal , and then fed to the high-precision time measurement interval its and the OCXO retardation of measuring module , where the use time - amplitude conversion method and direct counting method are combined , the elimination of ± 1 word counting error . Kalman filter for processing the measurement data , the eliminate the second signal jitter introduced measurement error . Finally, after the PID control and conversion circuit crystal implementation of calibration . In addition, the GPS signal at any time may be lost due to various factors , the article also describes a method based on the record of historical data to predict trends in the rate of aging , the crystal can continue to maintain a certain accuracy . Be completed on the basis of the basic principles of the design of the prototype hardware circuit and software program , and experimental data analysis , indicators of long-term accuracy and stability of the crystal has been greatly improved , for China the use of low-cost , high-precision frequency source to provide a strong guarantee.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio navigation > Navigation systems of the various institutional > Satellite navigation system
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