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Optical under-sampling multi-frequency frequency calculation method based on remainder difference characteristic value

A technology of frequency calculation and eigenvalue, applied in the field of frequency calculation of three-pulse light source optical undersampling electric field measurement system, can solve the problem that the frequency components to be down-converted are difficult to group correctly, so as to reduce the cost of the measurement system, reduce the measurement time, and facilitate popularization. Effect

Pending Publication Date: 2021-12-17
BEIHANG UNIV
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Problems solved by technology

[0005] In order to solve the problem that it is difficult to correctly group different frequency components to be down-converted under the condition of multiple frequencies to be measured in the three repeated-frequency under-sampling measurement systems, a remainder difference eigenvalue matching method is proposed, which can achieve a high accuracy rate Group the down-conversion components to ensure the correctness of the calculation of the frequency measurement system

Method used

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  • Optical under-sampling multi-frequency frequency calculation method based on remainder difference characteristic value
  • Optical under-sampling multi-frequency frequency calculation method based on remainder difference characteristic value
  • Optical under-sampling multi-frequency frequency calculation method based on remainder difference characteristic value

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Embodiment 1

[0080] The universality of the present invention is verified by MATLAB simulation. Randomly select 3 frequency points in the range of 50-250MHz as the repetition frequency, at (0, f max ) within the range of 100,000 groups of frequencies for testing, 6 frequencies for each group, record the number of errors, the number of frequency groups is 1-6 groups, and apply ±25kHz error to the down-conversion value. The experiment was performed 100 times. image 3 The simulation results are shown, and it can be seen from the results that the system error rate is lower than 5%. It can be seen that the method has universal applicability to the selection of repetition frequency, and has a high accuracy rate for multi-frequency measurement in the presence of measurement frequency offset.

Embodiment 2

[0082] The hardware connection schematic diagram is as follows Figure 4 As shown, the measurement system includes a pulsed light source, an optical switch, an optical circulator, a polarization-maintaining fiber, an optical electric field probe, an optical detector, a spectrum analyzer, and a PC. Although the experiments were performed indoors, neither pulsed light source was finely controlled, consistent with field conditions.

[0083] The radio frequency signal source inputs the radio frequency signal into the GTEM cell through the radio frequency transmission line, and forms a local uniform plane wave electric field. The optical electric field probe is placed in the quiet zone of the chamber, and connected to port 2 of the circulator through a long polarization-maintaining optical fiber. The three femtosecond pulsed laser sources are connected to port 1 of the circulator through an optical switch (the optical switch is controlled and switched by a single-chip microcompute...

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Abstract

The invention discloses an optical under-sampling multi-frequency frequency calculation method based on a remainder difference characteristic value, which is used for effectively grouping down-conversion signals with different frequencies and further realizing frequency calculation by researching the characteristics of remainder differences of frequency points to be measured. The method provided by the invention has strong universality for sampling repetition frequencies of different sizes, and has important significance for realizing rapid measurement of a multi-frequency electric field with field broadband distribution.

Description

technical field [0001] The invention belongs to the technical field of broadband fast electric field detection, and in particular relates to a method for calculating the frequency of a three-pulse light source optical undersampling electric field measurement system based on remainder difference eigenvalue matching. Background technique [0002] The development of electronic technology has brought about an increase in the complexity of the electromagnetic environment. How to quickly and effectively obtain electromagnetic field signals in a wide frequency range has become a meaningful technology. The traditional electric field measurement technology uses antenna and receiver to measure the electric field, which has the disadvantages of narrow bandwidth, low flatness, serious distortion, large volume, and weak anti-interference ability. With the development of optoelectronic technology, optical electric field sensors based on the electro-optical effect have been widely used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/12
CPCG01R29/12
Inventor 谢树果杨燕王天恒田雨墨郑铮赵欣
Owner BEIHANG UNIV
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