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High-precision frequency measuring system and method

A frequency measurement, high-precision technology, applied in the field of signal processing, can solve the problem of low measurement accuracy of short data, and achieve the effect of enhancing flexibility and avoiding waste of resources

Active Publication Date: 2017-08-18
NO 24 RES INST OF CETC
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  • Description
  • Claims
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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high-precision frequency measurement system and method for solving the problem of low accuracy in measuring short data in the prior art

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  • High-precision frequency measuring system and method
  • High-precision frequency measuring system and method

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Embodiment Construction

[0038] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...

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Abstract

The invention provides a high-precision frequency measuring system and method. The system includes an analog-to-digital conversion module for converting an analog intermediate frequency signal into a digital intermediate frequency signal; a frequency mixing module for generating two orthogonal carriers to convert the digital intermediate frequency signal to a digital baseband signal; a decimation filter module for performing the low-pass filtering and extraction on the digital baseband signal to reduce the data rate; a Fourier transform module for obtaining a frequency domain signal by subjecting the short data to discrete Fourier transform; a frequency measurement module for obtaining a first frequency measurement value by means of three-point interpolation frequency measurement based on the maximum amplitude of the frequency domain signal and the adjacent two calculated values; a scanning module for calculating the maximum amplitude point by point according to the Fourier transform method by taking the first frequency measurement value as the center and performing the step scanning in the scanning range to obtain a scanned second frequency measurement value; and a selector for selecting one of the measured results of the first and second frequency measurement values. Therefore, the frequency measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a short-data high-precision frequency measurement system and method based on digital signal processing. Background technique [0002] Parameter estimation is an important part of the subject of signal and information processing, and it is also a very active and rapidly developing research field in recent years. In time series, signal frequency is an important signal parameter. Measuring the frequency of sine waves submerged in noise is one of the most practical techniques in modern signal processing. Foundation. This technology is widely used in radar, electronic countermeasures, sonar and other fields. The progress of frequency measurement technology will inevitably promote the development of the above application fields. With the rapid development of modern communication and information processing technology, the research on frequency measurement technology will inev...

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Application Information

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IPC IPC(8): G01R23/02
CPCG01R23/02G01R23/04G01R23/163
Inventor 李瀛台胡刚毅刘伦才王健安雷昕黄晓宗王国强赵晋李健壮
Owner NO 24 RES INST OF CETC
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