High precision frequency measurement system and method
A frequency measurement, high-precision technology, applied in the field of signal processing, can solve the problem of low accuracy of measuring short data, achieve the effect of enhancing flexibility and avoiding waste of resources
Active Publication Date: 2019-08-16
NO 24 RES INST OF CETC
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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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[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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The present invention provides a high-precision frequency measurement system and method. The system includes: an analog-to-digital conversion module, which is used to convert an analog intermediate frequency signal into a digital intermediate frequency signal; The intermediate frequency signal is converted into a digital baseband signal; the extraction filter module is used for low-pass filtering and extraction of the digital baseband signal to reduce the data rate; the Fourier transform module is used for discrete Fourier transform of short data to obtain a frequency domain signal; frequency measurement The module uses three-point interpolation frequency measurement to obtain the first frequency measurement value based on the maximum value of the amplitude in the frequency domain signal and the two adjacent calculated values; the scanning module takes the first frequency measurement value as the center and uses step Scanning is carried out, and the maximum value of the amplitude is calculated point by point according to the Fourier transform method to obtain the second frequency measurement value of the scan; the selector is used to select one of the measurement results of the first and second frequency measurement values. Improved frequency measurement accuracy.
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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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