Device for comparing double-mode frequency scales and measuring frequency stability

Abstract

The invention relates to a device for comparing double-mode frequency scales and measuring frequency stability. The device is composed of a frequency difference multiplication module, a beating module, a direct digital frequency synthesizer, a 1PPS processing module, an embedded frequency scale comparing module and a measuring module. When a frequency difference multiplication method is adopted, the time of frequency multiplication is selected, thereby performing time domain stability comparison on frequency scale sources of standard frequency points; when a beating method is adopted, a reference standard frequency source passes through the direct digital frequency synthesizer and then is subjected to beating and filtering shaping treatment together with any frequency point in an input 10KHz-100Khz frequency scope, thereby finishing the measurement for the time domain frequency stability; the 1PPS processing module is used for outputting a 1PPS signal or synchronizing a 1PPS input signal; the comparison and measurement for the frequency scales are finished in an embedded mode; and the device can be interconnected with a PC (Personal Computer), and data processing and test are finished by a micro-computer. The device provided by the invention is high in measuring precision, can be used for comparing and measuring high-precision frequency scale sources, and is suitable for the measurement on a frequency stability index of an ordinary crystal resonator or an active crystal resonator.

Description

technical field [0001] The invention belongs to the technical field of comparison and testing of high-precision frequency sources, and in particular relates to a dual-mode frequency standard comparison frequency stability measurement device. Background technique [0002] Time and frequency sources are widely used in various sectors of the national economy. For example, in communication equipment, crystal oscillators with relatively high frequency accuracy and stability are mostly used as reference sources for frequency synthesizers in equipment. Their short-term frequency stability can be found in range, said drift in scope. At the same time, as time goes by, the aging characteristics of the quartz crystal oscillator will make its frequency accuracy gradually deteriorate, thereby affecting the performance index of the communication equipment, and even the reliable operation of the communication equipment. Another example is the atomic frequency standard, which has a hig...

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Problems solved by technology

At the same time, with the passage of time, the aging characteristics of the quartz crystal oscillator will gradually deteriorate its frequency accuracy, thereby affecting the performance indicators of communication equipment, and even the reliable operation of communication equipment

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