• High Power Laser and Particle Beams
  • Vol. 36, Issue 4, 043005 (2024)
Jianxuan Li1, Niyao Zhu1、*, Zusheng Jin1, Rui Chen1, Xiao Zhang2, and Jialin Shi1
Author Affiliations
  • 1Naval Research Institute, Beijing 100161, China
  • 2National Key Laboratory of electromagnetic Energy Technology, Naval University of Engineering, Wuhan 430033, China
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    DOI: 10.11884/HPLPB202436.230246 Cite this Article
    Jianxuan Li, Niyao Zhu, Zusheng Jin, Rui Chen, Xiao Zhang, Jialin Shi. Multi-channel time-domain rapid measurement and signal calculation method for electromagnetic interference[J]. High Power Laser and Particle Beams, 2024, 36(4): 043005 Copy Citation Text show less

    Abstract

    In view of the characteristics of many electromagnetic interference measurement parameters, measurement points and measurement conditions in complex electromagnetic environment and large-scale systems, the traditional sweeping frequency-domain measurement method has practical problems such as high cost and being time-consuming. This paper proposes a multi-channel time-domain rapid measurement and signal calculation method for low-frequency electromagnetic interference, and a multi-channel time-domain rapid measurement system for low-frequency electromagnetic interference is developed. The experimental results show that the proposed measurement, calculation method and the developed measurement system can accurately obtain the low frequency electromagnetic interference characteristics of complex electromagnetic environment and large-scale system, and the measurement speed is fast and the cost is low.
    $ y(t) = \displaystyle\sum\limits_{{f_k} = 0}^\infty {A({f_k})\cos [2\pi {f_k}t + \varphi ({f_k})]} , \quad 0 \leqslant t \leqslant T $(1)

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    $ Y(k) = \displaystyle\sum\limits_{n = 0}^{N - 1} {y(n)W_N^{nk},\quad \;k = 0,{\kern 1pt} \,1\,,\, \cdots \,,\,N - 1} $(2)

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    $ A({f_k}) = \left\{ {\begin{array}{*{20}{l}} {\dfrac{1}{N}{{\mathrm{Re}}} (Y(k)), }&{ k = 0 }\\ { \dfrac{2}{N}\sqrt {{{[{{\mathrm{Re}}} (Y(k))]}^2} + {{[{{\mathrm{Im}}} (Y(k))]}^2}} , }&{ k \geqslant 1 }\end{array}} \right. $(3)

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    $ f_{{\mathrm{x}}}=|f_{{\mathrm{a}}}-kf_{{\mathrm{s}}}|,\quad k=0,\;1,\;2,\; \cdots ,\;N $(4)

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    $ 0.5f_{{\mathrm{s}}}>f_{{\mathrm{stop}}}>f_{{\mathrm{max}} } $(5)

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    $ X(k)= \left\{ {\begin{array}{*{20}{l}} {c(\left|{f}_{k}-{f}_{{\mathrm{x}}}\right|)Y(k), }&{{f}_{{\mathrm{x}}}-\dfrac{B}{2}\leqslant {f}_{k}\leqslant {f}_{{\mathrm{x}}}+\dfrac{B}{2} }\\ {0, }&{{f}_{k} < {f}_{{\mathrm{x}}}-\dfrac{B}{2} \; {\mathrm{or}} \; {f}_{k} > {f}_{{\mathrm{x}}}+\dfrac{B}{2} }\end{array}} \right. $(6)

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    $ x(t) = \displaystyle\sum\limits_{f_k = {f_{\mathrm{x}}} - B/2}^{{f_{\mathrm{x}}} + B/2} {c(\left| {{f_k} - {f_{\mathrm{x}}}} \right|)A({f_k})\cos [2{\text{π }}{f_k}t + \varphi ({f_k})]} $(7)

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    Jianxuan Li, Niyao Zhu, Zusheng Jin, Rui Chen, Xiao Zhang, Jialin Shi. Multi-channel time-domain rapid measurement and signal calculation method for electromagnetic interference[J]. High Power Laser and Particle Beams, 2024, 36(4): 043005
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