Accession Number : ADP001525

Title :   A Squarewave F.M. Servo System with a Digital Signal Processing for Cesium Frequency Standards,

Corporate Author : NATIONAL RESEARCH LAB OF METROLOGY TSUKUBA SCIENCE CITY (JAPAN)

Personal Author(s) : Nakadan,Y. ; Koga,Y.

Report Date : 1982

Pagination or Media Count : 7

Abstract : This paper describes a servo system with a digital signal processing which has been applied to a cesium frequency standard recently. In contrast to the former servo system which adopted an analogue lock-in system with 2 Hz frequency modulation, the new system has various advantages such as a good linearity of modulation and demodulation, little dc offset of signal processing and easy compensations for optimum control. Some experiments at other laboratories show that the linear dc drift of output signal can be removed by a signal processing with the second order differences.

Descriptors :   *Frequency, *Control, *Symposia, *Digital systems, *Signal processing, Cesium, Frequency standards, Optimization, Theory, Laboratory tests, Linearity, Modulation, Demodulation

Distribution Statement : APPROVED FOR PUBLIC RELEASE