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A Large Dynamic and High Accuracy Synchronous Continuous Frequency Measurement Method

A high-precision synchronization and frequency measurement technology, which is applied in the direction of frequency measurement devices, frequency-to-pulse sequence conversion, etc., achieves the effects of simple implementation, easy ASIC integration, and reduced requirements for counters and system operating frequencies

Active Publication Date: 2016-05-18
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to further subdivide the quantization error that cannot be identified by the high-frequency clock in the multi-cycle synchronization method, improve the error resolution, and realize the short-time synchronous continuous high-precision measurement of large dynamic multi-channel signals in view of the deficiencies of the existing technology

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  • A Large Dynamic and High Accuracy Synchronous Continuous Frequency Measurement Method
  • A Large Dynamic and High Accuracy Synchronous Continuous Frequency Measurement Method
  • A Large Dynamic and High Accuracy Synchronous Continuous Frequency Measurement Method

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[0052] The large dynamic and high-precision synchronous continuous frequency measurement method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] Such as figure 1 As shown, the large dynamic and high-precision synchronous continuous frequency measurement method of the present invention first adopts the multi-cycle synchronization method to calculate the complete cycle number of the measured signal in one cycle of the sampling time gate signal, and then uses high-frequency pulse and delay unit to further subdivide Measure the error, and finally calculate the frequency of the measured signal. Specifically include the following steps:

[0054] Step 1. Use the measured signal to count the synchronized sampling time gate signal

[0055] Let the measured signal frequency be f x , the period is T x ; The frequency of the sampling time gate signal is f s , the period is T s . Synchronize the measured...

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Abstract

The invention belongs to the technical field of frequency measurement and particularly relates to a large dynamic high-precision synchronization continuous frequency measurement method. The method disclosed by the invention comprises the following steps: S1, counting synchronized sampling time gate signals by adopting a measured signal; S2, counting by adopting a high-frequency impulse; S3, counting by adopting delay cell interpolation; S4, performing error correction to determine the frequency of the measured signal. According to the method disclosed by the invention, quantization errors which cannot be recognized by a high-frequency clock in a multi-period synchronizing method are subdivided, and therefore, the resolution ratio of the errors is improved, and large dynamic multichannel signal short time synchronization continuous high-precision measurement is realized.

Description

technical field [0001] The invention belongs to the technical field of frequency measurement, and in particular relates to a large dynamic and high-precision synchronous continuous frequency measurement method. Background technique [0002] In the prior art, a multi-period synchronization method and an analog interpolation method are mainly used for short-term frequency measurement. [0003] The quantization error of the multi-cycle synchronization method depends on the frequency of the high-frequency filling clock. The higher the frequency, the less the quantization error, but after the frequency increases, the number of bits in the counter will increase accordingly, and the multi-bit counter will limit the increase in the clock frequency, resulting in a decrease The quantization error of multi-period synchronous frequency measurement method is very difficult, usually at 1kHz sampling frequency, the quantization error is 10 -5 Level. [0004] The analog interpolation meth...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/10
Inventor 赵振涌何杰李婷婷王宁张伟斌袁寰邢娜
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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