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Optical undersampling frequency recovery method based on remainder matching

A technology of frequency recovery and under-sampling, which is applied in the field of frequency recovery of the optical under-sampling electric field measurement system with double pulse light sources, can solve the problems of frequency recovery and reduce the cost of the measurement system, reduce the working conditions and improve the measurement speed.

Active Publication Date: 2021-07-20
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a small repetition frequency difference is generally produced under the precise control of the laboratory, and in the field measurement, such as the field environment or battlefield environment, it does not have such ideal control conditions, resulting in the failure to recover the frequency

Method used

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  • Optical undersampling frequency recovery method based on remainder matching
  • Optical undersampling frequency recovery method based on remainder matching
  • Optical undersampling frequency recovery method based on remainder matching

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Experimental program
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Embodiment 1

[0128] The validity of the method of the present invention is verified by MATLAB simulation. The electric field sensor system adopts the repetition frequency as f 1 = 213226kHz and f 2 =216495kHz femtosecond pulse light source. Calculated and analyzed according to the method of the present invention, the frequency application range is the least common multiple of the two repetition frequencies, and its value is 46162362870kHz. When the blur radius is R=50kHz and the measuring frequency range is 10GHz, the false alarm rate of the system is about 4.42%.

[0129] Randomly select 100,000 frequency points in the 10GHz range, and obtain 8951 false alarm excitation frequency points through MATLAB simulation, with a false alarm rate of 4.02%. After removing the false alarm points, the system simulation error is as follows: Figure 5 As shown, the calculation error is less than 50kHz. The simulation results are consistent with the calculation results.

Embodiment 2

[0131] The schematic diagram of the experimental hardware connection is as follows: Figure 6 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.

[0132] The signal source injects the radio frequency signal into the GTEM cell (gigahertz TEM cell) through the transmission line, forming a local uniform electric field in the unit; the electric field probe is placed in the static area of ​​the GTEM cell, and is connected to the No. 2 port of the circulator through a long optical fiber; the circulator's Port 1 is connected to two femtosecond pulse light sources through an optical switch controlled by a single-chip microcomputer, port 3 is connected to a photodetector, and the ou...

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Abstract

The invention discloses an optical undersampling frequency recovery method based on remainder matching, which summarizes the relationship among repetition frequency, the maximum value of frequency to be measured, the measurement error of a receiver and the error rate of a system by researching the characteristics of the remainder of the frequency to be measured, and designs a frequency calculation program. The algorithm has universality for the magnitude of the undersampling repetition frequency difference, not only can be applied to the small repetition frequency difference condition accurately controlled by a laboratory, but also can be applied to the large repetition frequency difference condition of a fixed-frequency light source, and has important significance for rapid measurement of a field electric field.

Description

technical field [0001] The invention belongs to the technical field of broadband fast electric field detection, and in particular relates to a frequency recovery method of a dual pulse light source optical undersampling electric field measurement system based on remainder matching. Background technique [0002] With the development of modern electronic technology, the spectrum components of electromagnetic signals are complex, the frequency bands are widely distributed, and the energy of various signals varies greatly. It is necessary for the electric field measurement system to quickly obtain the spectrum of all possible threats. This requires the measurement system to have the characteristics of high real-time bandwidth, high dynamic range, and high damage resistance threshold. The traditional electric field test system is generally composed of an antenna or a metal probe followed by a receiver. This detection form has high sensitivity, versatility and relatively low cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/12G01R23/02
CPCG01R29/12G01R23/02
Inventor 谢树果杨燕王天恒田雨墨王铁凝
Owner BEIHANG UNIV
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