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Time Domain Frequency Stability Calculated from the Frequency Domain Description: Use of the SIGINT Software Package to Calculate Time Domain Frequency Stability from the Frequency Domain

机译:从频域计算的时域频率稳定性描述:使用sIGINT软件包从频域计算时域频率稳定性

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The report describes the use of SIGINT, a new interactive software package which facilitates the calculation of time domain frequency stability in terms of the Allan variance as a function of measuring time from frequency domain data. Except for the graphic output, the code is written in standard FORTRAN 77 and runs on AT compatible computers that have a math co-processor. It also runs on many other systems; however, calls to an available graphics library will need to be substituted for those that are included in this version. The program uses either a user defined function for the input noise or default functions that describe the noise types commonly found in oscillators, amplifiers, frequency multipliers, frequency dividers, and general signal processing equipment. These default functions make it simple to analyze the time domain frequency stability as a function of measuring bandwidth using realistic first-, second-, or third- order low-pass filters or the simplified infinitely sharp cutoff parameter. The default functions are also set up to examine the effect of various servo parameters on the performance of a frequency source locked to a frequency reference.

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