通信電臺(tái)電磁輻射2階互調(diào)低頻阻塞效應(yīng)與作用機(jī)理

魏光輝; 趙凱; 任仕召

doi:10.11999/JEIT190574

通信電臺(tái)電磁輻射2階互調(diào)低頻阻塞效應(yīng)與作用機(jī)理

doi: 10.11999/JEIT190574 cstr: 32379.14.JEIT190574

陸軍工程大學(xué)石家莊校區(qū)電磁環(huán)境效應(yīng)國家級(jí)重點(diǎn)實(shí)驗(yàn)室石家莊 050003

詳細(xì)信息

作者簡介:
魏光輝：男，1964年生，教授，主要研究方向?yàn)殪o電與電磁防護(hù)技術(shù)、電磁環(huán)境效應(yīng)試驗(yàn)評(píng)估技術(shù)

趙凱：男，1991年生，博士生，研究方向?yàn)殡姶怒h(huán)境效應(yīng)試驗(yàn)評(píng)估技術(shù)

任仕召：男，1988年生，碩士生，研究方向?yàn)殡姶怒h(huán)境效應(yīng)試驗(yàn)評(píng)估技術(shù)

通訊作者:
趙凱　 oeczhao@126.com

中圖分類號(hào): TN924; TM937
計(jì)量
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-07-30
- 修回日期: 2020-03-06
- 網(wǎng)絡(luò)出版日期: 2020-04-25
- 刊出日期: 2020-08-18

Second-order Intermodulation Low Frequency Blocking Effect and Mechanism for Communication Radio under Electromagnetic Radiation

National Key Laboratory on Electromagnetic Environment Effects, Army Engineering University, Shijiazhuang 050003, China

摘要

摘要:
為揭示通信電臺(tái)復(fù)雜電磁環(huán)境效應(yīng)機(jī)理，該文采用全電平輻照法實(shí)驗(yàn)研究了某型超短波數(shù)字通信電臺(tái)的單頻和帶外雙頻電磁輻射阻塞效應(yīng)，確定了其單頻電磁輻射效應(yīng)規(guī)律和敏感帶寬，實(shí)驗(yàn)數(shù)據(jù)表明受試電臺(tái)對(duì)帶外雙頻3階互調(diào)阻塞較單頻電磁輻射阻塞干擾敏感9～23 dB。實(shí)驗(yàn)過程中發(fā)現(xiàn)了一種既不能用雙頻非互調(diào)迭加機(jī)理解釋、也不能用3階交互調(diào)機(jī)理解釋的雙頻電磁輻射敏感現(xiàn)象。
- 通信電臺(tái) /
- 電磁輻射 /
- 2階互調(diào) /
- 阻塞效應(yīng) /
- 機(jī)理
Abstract:
In order to reveal the complex electromagnetic environment effects mechanism of communication radio, the blocking effect of single-frequency and out-of-band dual-frequency electromagnetic radiation for the ultra-short wave digital communication radio is experimentally studied by irradiation method. The rule of single-frequency electromagnetic radiation effect and the susceptible bandwidth are determined. The experimental data show that the tested radio is 9～23 dB more susceptible to out-of-band dual-frequency third-order intermodulation blocking than single-frequency electromagnetic radiation blocking. A sensitive phenomenon of dual-frequency electromagnetic radiation which can neither be explained by the dual-frequency non-intermodulation superposition mechanism nor by the third-order intermodulation mechanism has been found in the experiment.
- Communication radio /
- Electromagnetic radiation /
- Second-order intermodulation /
- Blocking effect /
- Mechanism

HTML全文

圖 1 通信電臺(tái)單頻電磁輻射效應(yīng)試驗(yàn)配置

下載: 全尺寸圖片幻燈片

圖 2 受試通信電臺(tái)單頻阻塞臨界干擾場強(qiáng)

下載: 全尺寸圖片幻燈片

圖 3 通信電臺(tái)雙頻電磁輻射效應(yīng)試驗(yàn)配置

下載: 全尺寸圖片幻燈片

圖 4 通信電臺(tái)原理結(jié)構(gòu)框圖

下載: 全尺寸圖片幻燈片

圖 5 受試通信電臺(tái)低頻干擾電平隨互調(diào)頻差的變化

下載: 全尺寸圖片幻燈片

圖 6 受試通信電臺(tái)2階互調(diào)低頻阻塞干擾因子隨輻射頻偏的變化

下載: 全尺寸圖片幻燈片

表 1 通信電臺(tái)雙頻3階互調(diào)阻塞臨界干擾場強(qiáng)

頻率組合(kHz)	Δf₁=f₁–f₀	36	48	72	96	144
頻率組合(kHz)	Δf₂=f₂–f₀	72	96	144	192	288
臨界干擾場強(qiáng)比	E₁/E₁₀	–11.7	–12.3	–13.3	–17.9	–18.2
臨界干擾場強(qiáng)比	E₂/E₂₀	–13.2	–22.5	–24.8	–32.3	–27.1
頻率組合(kHz)	Δf₁=f₁–f₀	36	48	72	96	144
頻率組合(kHz)	Δf₂=f₂–f₀	48	86	154	212	268
臨界干擾場強(qiáng)比	E₁/E₁₀	–8.7	–13.3	–13.6	–19.5	–19.8
臨界干擾場強(qiáng)比	E₂/E₂₀	–10.8	–17.0	–24.1	–19.9	–22.9

下載: 導(dǎo)出CSV

表 2 通信電臺(tái)新型雙頻阻塞臨界干擾場強(qiáng)

頻率組合(kHz)	Δf₁=f₁–f₀	100	150	200	250	300
頻率組合(kHz)	Δf₂=f₂–f₀	150	200	250	300	350
臨界干擾場強(qiáng)比	E₁/E₁₀	–25.6	–26.3	–28.7	–28.4	–30.6
臨界干擾場強(qiáng)比	E₂/E₂₀	–26.7	–29.5	–29.2	–30.5	–28.5
頻率組合(kHz)	Δf₁=f₁–f₀	127	150	220	240	230
頻率組合(kHz)	Δf₂=f₂–f₀	177	160	330	360	390
臨界干擾場強(qiáng)比	E₁/E₁₀	–26.5	–17.5	–30.6	–34.4	–4.0
臨界干擾場強(qiáng)比	E₂/E₂₀	–27.7	–17.7	–30.5	–34.4	–4.1

下載: 導(dǎo)出CSV

表 3 干擾信號(hào)進(jìn)入通信電臺(tái)各結(jié)構(gòu)后輸出分量頻率

結(jié)構(gòu)	頻率
天線接收	f₁, f₂(設(shè)f₁<f₂)
一級(jí)放大	f₁, f₂, f₂±f₁, 2f₁±f₂和2f₂±f₁, 3f₁和3f₂(忽略高階互調(diào)分量)
上變頻	F_m+f₀–f₁, F_m+f₀–f₂, F_m+f₀–f₂±f₁, F_m+f₀–2f₁±f₂, F_m+f₀–2f₂±f₁, F_m+f₀–3f₁, F_m+f₀–3f₂和 F_m+f₀+f₁, F_m+f₀+f₂, F_m+f₀+f₂±f₁, F_m+f₀+2f₁±f₂, F_m+f₀+2f₂±f₁, F_m+f₀+3f₁, F_m+f₀+3f₂
窄帶濾波	F_m+f₀–f₁, F_m+f₀–f₂, F_m+f₀–2f₁+f₂和F_m+f₀–2f₂+f₁
三級(jí)放大	F_m+f₀–f₁, F_m+f₀–f₂, F_m+f₀–2f₁+f₂, F_m+f₀–2f₂+f₁和f₂–f₁, 2(f₂–f₁), 3(f₂-f₁), 2(F_m+f₀)–f₁–f₂, 2(F_m+f₀–f₁), 2(F_m+f₀–f₂), 2(F_m+f₀)–3f_1–f₂, 2(F_m+f₀)–3f₂–f₁(忽略3階互調(diào))
下變頻與低通(帶通)濾波	F_L+f₀–f₁, F_L+f₀–f₂, F_L+f₀–2f₁+f₂, F_L+f₀–2f₂+f₁, F_L+(f₂–f₁), F_L+2(f₂–f₁), F_L+3(f₂–f₁)

下載: 導(dǎo)出CSV

表 4 2階互調(diào)低頻阻塞干擾效應(yīng)評(píng)估準(zhǔn)確度

電臺(tái)工作頻率(MHz)		50	60	70	50	60	70
頻率組合(kHz)	f₁–f₀	200	200	200	200	200	230
頻率組合(kHz)	f₂–f₀	250	250	250	300	300	330
臨界干擾場強(qiáng)比	E₁/E₁₀	–25.0	–28.9	–29.1	–26.3	–30.2	–29.1
臨界干擾場強(qiáng)比	E₂/E₂₀	–23.7	–30.9	–22.0	–28.7	–30.1	–28.9
評(píng)估準(zhǔn)確度R₂		4.4	–6.7	2.0	–4.1	–9.4	–7.6

下載: 導(dǎo)出CSV

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