Resonant Frequency Extraction Method and System Based on Amplitude-Frequency Response and Least Square Method
A technology of least squares and resonant frequency, applied in instruments, complex mathematical operations, testing dielectric strength, etc., can solve the problems of unstable noise fluctuation, poor extraction accuracy, etc., to reduce the impact of extraction accuracy and improve extraction accuracy. Effect
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Embodiment 1
[0039] figure 1 The schematic diagram of a typical resonant cavity method material testing scene is shown. Signal generation and receiving equipment are used to generate and receive signals. The commonly used signal transmitting and receiving equipment is a vector network analyzer or scalar network analyzer, which excites the resonant cavity to generate a resonance curve. The curve contains the resonant frequency and quality factor of the current test signal, and the method for extracting the resonant frequency and quality factor. Currently, the 3dB method is commonly used. The principle schematic diagram of the 3dB method for resonant frequency and quality factor extraction is as follows figure 2 shown.
[0040] The basic principle of the 3dB method is to first search for the maximum value of the test data, denoted as A max , its corresponding frequency f 0 It is the resonant frequency of the current test data, and then calculate the frequency corresponding to the maximum ...
Embodiment 2
[0091] This embodiment provides a resonant frequency extraction system based on amplitude frequency response and least square method, the system includes:
[0092] The data sampling module is used to obtain the amplitude-frequency response curve of the resonant cavity, and sample the frequency data and amplitude data of the resonant cavity;
[0093] The constant solution module is used to solve the frequency-independent constant in the amplitude-frequency response curve of the resonator by the least square method;
[0094] The frequency calculation module is used to calculate the resonant frequency and the quality factor by using the obtained frequency-independent constant in the amplitude-frequency response curve of the resonant cavity.
Embodiment 3
[0096] This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented:
[0097] Obtain the amplitude-frequency response curve of the resonator, and sample the frequency data and amplitude data of the resonator;
[0098] Using the least square method to solve the frequency-independent constant in the amplitude-frequency response curve of the resonator;
[0099] The resonant frequency and quality factor are calculated by using the obtained frequency-independent constant in the amplitude-frequency response curve of the resonator.
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