A Study Of New Methods About Frequency Control And Measurements

In the modern science and technology, especially in the metrology, electronic techniques, information science, communications, measurement techniques and instrumentation, frequency and time measurement and their control techniques have a very important position. This paper mainly discusses the study of some new methods and techniques of frequency control and measurement.Firstly, the paper gives an introduction on a new type of frequency control technique. It is a new type of temperature compensated crystal oscillator based on analog storage (function storage) technique. The structure and price of analog storage temperature compensated crystal oscillator are similar to that of TCXO, and its temperature stability is close to that of MCXO. The paper introduces mainly the theory of analog storage technique, system design and development of ASCXO, and its implement. This work is supported by the National Nature Science Foundations of China.The second part of this paper introduces the study of frequency and time measurement techniques. By the method of quantifying delay time, we complete an accurate short time interval measurement. Based on the method and combined with other techniques, frequency, period, time interval, phase and many other signals can be measured accurately. The method can be used in the measurement of periodic and nonperiodic signal. According to the high accuracy and fixed gate-time measurement method, based on the multiple period synchronization method, the high speed, high accuracy and continuous frequency measurement is accomplished. The paper introduces the design and development of measurement system relied on this method. The method can be used widely in the field of autocontrol system in the aviation, aerospace, national defense.With the new methods, high accuracy in measurement and control, and low-cost can be obtained.