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Method for enhancing reciprocal counter frequency resolution

A frequency resolution, reciprocal counter technology, applied in the field of reciprocal counter frequency resolution enhancement, to achieve the effects of improving measurement accuracy, reducing random errors, and improving frequency resolution

Inactive Publication Date: 2014-02-26
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] In summary, the frequency resolution of the reciprocal counter in the prior art needs to be further enhanced

Method used

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  • Method for enhancing reciprocal counter frequency resolution
  • Method for enhancing reciprocal counter frequency resolution
  • Method for enhancing reciprocal counter frequency resolution

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Embodiment Construction

[0038] combine figure 2 and image 3 , a reciprocal counter frequency resolution enhancement method, using a high frequency resolution reciprocal counter, that is, based on the high frequency resolution of the reciprocal counter, sending a periodic gate through the FPGA, under the premise that the frequency of the detection input signal does not change, Carry out continuous measurement, calculate the arithmetic mean value of N times measured frequency values, and display the result as the arithmetic mean value of N times measured values, so as to achieve the purpose of frequency resolution enhancement.

[0039] The method for enhancing the frequency resolution of the reciprocal counter specifically includes the following steps:

[0040] a. The frequency to be measured is the square wave of the input signal after being shaped by the comparator. It is first synchronized with the periodic gate sent by the FPGA to obtain the periodic gate synchronized with the signal.

[0041] ...

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Abstract

The invention discloses a method for enhancing a reciprocal counter frequency resolution. The method is characterized in that a reciprocal counter with a high frequency resolution is utilized, a periodic gate is sent via an FPGA, and continuous measurement is performed under the premise that an input single frequency is unchanged through detection. An arithmetic average value is obtained from N measurement frequency values, and a display result is the arithmetic average value of the N measurement values so that an objective of enhancing the frequency resolution is achieved. The method has the following advantages: 1) the frequency resolution can be further enhanced for 2-3 effective bits on the basis of the high frequency resolution of the conventional reciprocal counter; 2) the arithmetic average value is obtained via continuous measurement so that random errors are greatly reduced and measurement precision is further enhanced; and 3) data processing is realized and performed via control of the FPGA so that the method is easy to carry out and high in measurement speed.

Description

technical field [0001] The invention relates to a method for enhancing frequency resolution of a reciprocal counter. Background technique [0002] The frequency resolution of a counter refers to the smallest change in frequency that the counter can detect. The essence of the countdown counter is to measure the time interval. By measuring the time interval of the synchronous gate and the pulse number of the signal in the gate, the frequency is calculated. The frequency resolution of the reciprocal counter with a single time interval resolution of 100ps is 10 digits per second, that is, when the gate time is 1s, the effective digits displayed by the reciprocal counter are 10 digits. For example, to measure a 1kHz signal, the frequency resolution is 1uHz (1uHz=10 -6 Hz). Random error is the most important factor affecting the resolution, random error includes counting error and trigger error. It is inevitable that there will be ±1 counting error and trigger error in the cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06M3/08H03K21/00
Inventor 王励杨江涛滕超刘永贺增昊
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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