High Power Laser and Particle Beams, Volume. 35, Issue 8, 083001(2023)
Prediction model of second-order intermodulation pseudo-signal interference effect for radar equipment
Figures & Tables(12)
Fig. 1. Critical blocking interference field strength of single frequency electromagnetic radiation of the tested radar
Fig. 2. Radar detection target imaging under dual-frequency electromagnetic radiation
Fig. 3. Variation curve of second-order intermodulation pseudo-signal with interference field strength
Fig. 4. Change of second-order intermodulation pseudo-signal level with radiation frequency difference when the interference field strength is fixed
Fig. 5. Change of second-order intermodulation pseudo-signal interference factor with radiation frequency offset
Fig. 6. Curve of the relative value of the low-frequency pseudo-signal level with the second-order cross-frequency modulation difference
Table 1. Fitting values of single frequency electromagnetic radiation critical blocking interference field strength
View tableView in ArticleTable 1. Fitting values of single frequency electromagnetic radiation critical blocking interference field strength
Δfi/MHz Ei0/(V·m−1) Δfi/MHz Ei0/(V·m−1) Δfi/MHz Ei0/(V·m−1) Δfi/MHz Ei0/(V·m−1) Δfi/MHz Ei0/(V·m−1) −320 90.2 −180 2.1 −40 0.5 100 0.6 240 79.4 −300 88.1 −160 0.9 −20 0.5 120 0.7 260 85.1 −280 76.7 −140 0.5 0 0.5 140 0.8 280 87.1 −260 50.7 −120 0.5 20 0.5 160 1.1 300 89.1 −240 24.3 −100 0.5 40 0.5 180 4.0 320 87.1 −220 11.4 −80 0.5 60 0.6 200 18.2 − − −200 4.9 −60 0.5 80 0.6 220 60.9 − −
Table 2. Test results of second-order intermodulation pseudo-signal interference factor
\begin{document}$ \;{ \beta _{\text{F}}}(\Delta {f_i}) $\end{document} View tableView in ArticleTable 2. Test results of second-order intermodulation pseudo-signal interference factor
\begin{document}$ \;{ \beta _{\text{F}}}(\Delta {f_i}) $\end{document} Δfi/MHz $ \;{ \beta _{\text{F}}}(\Delta {f_i}) $ Δfi/MHz $ \;{ \beta _{\text{F}}}(\Delta {f_i}) $ Δfi/MHz $ \;{ \beta _{\text{F}}}(\Delta {f_i}) $ Δfi/MHz $ \;{ \beta _{\text{F}}}(\Delta {f_i}) $ −340 10.3 −160 11.4 20 12.8 200 10.8 −320 10.5 −140 11.9 40 13.0 220 10.4 −300 10.5 −120 12.4 60 13.2 240 10.2 −280 10.4 −100 12.7 80 13.3 260 10.2 −260 10.3 −80 12.8 100 13.3 280 10.2 −240 10.2 −60 12.8 120 13.0 300 10.3 −220 10.2 −40 12.7 140 12.5 320 10.2 −200 10.4 −20 12.6 160 11.9 340 10.1 −180 10.8 0 12.6 180 11.3 360 9.9
Table 3. Test results of low frequency pseudo signal level relative value
X r(∆f )View tableView in ArticleTable 3. Test results of low frequency pseudo signal level relative value
X r(∆f )|Δf|/MHz Xr(∆f)/dB |Δf|/MHz Xr(∆f)/dB |Δf|/MHz Xr(∆f)/dB |Δf|/MHz Xr(∆f)/dB |Δf|/MHz Xr(∆f)/dB 0.1 0.4 0.7 0.0 1.3 2.4 1.9 6.3 2.5 11.5 0.2 0.5 0.8 0.0 1.4 3.0 2 7.1 2.6 12.9 0.3 0.4 0.9 0.2 1.5 3.7 2.1 7.9 2.7 14.7 0.4 0.4 1 0.5 1.6 4.3 2.2 8.7 2.8 16.9 0.5 0.2 1.1 1.0 1.7 4.9 2.3 9.5 2.9 19.6 0.6 0.1 1.2 1.7 1.8 5.6 2.4 10.4 3 22.7
Table 4. Interference effect evaluation of second-order intermodulation pseudo-signal under different sensitive levels
View tableView in ArticleTable 4. Interference effect evaluation of second-order intermodulation pseudo-signal under different sensitive levels
criterion/dBmV Δf1/MHz Δf2/MHz βF(Δf1)= βF(Δf2) Xr(0.6M) $ (\dfrac{{E}_{1}}{{E}_{10}}\text{.}\dfrac{{E}_{2}}{{E}_{20}})\text{/dB} $ RFS2/dB 6 −0.6 0 12.6 0.1 −30.5 0.6 −0.3 0.3 12.6 0.1 −32.1 −1.0 0 0.6 12.6 0.1 −30.2 0.9 18 −0.6 0 12.6 0.1 −18.6 0.5 −0.3 0.3 12.6 0.1 −19.1 0 0 0.6 12.6 0.1 −18.9 0.2
Table 5. Interference effect evaluation of second-order intermodulation pseudo-signal in large radiation frequency offset range
View tableView in ArticleTable 5. Interference effect evaluation of second-order intermodulation pseudo-signal in large radiation frequency offset range
Δfi/MHz βF(Δf2) $ (\dfrac{{E}_{1}}{{E}_{10}}\text{.}\dfrac{{E}_{2}}{{E}_{20}})\text{/dB} $ RFS2/dB −300 10.5 −19.1 −1.1 −200 10.4 −18.0 −0.2 −100 12.7 −22.4 0 0 12.6 −22.0 0.2 100 13.3 −23.5 0.1 200 10.8 −19.7 −1.1 300 10.3 −15.7 1.9
Table 6. Interference effect evaluation of second-order intermodulation pseudo-signal with large intermodulation frequency difference range
View tableView in ArticleTable 6. Interference effect evaluation of second-order intermodulation pseudo-signal with large intermodulation frequency difference range
|Δf|/MHz βF(Δf2) Xr(∆f)/dB $(\dfrac{ {E}_{1} }{ {E}_{10} }\text{.}\dfrac{ {E}_{2} }{ {E}_{20} })\text{/dB}$ RFS2/dB 0.6 12.6 0.1 −21.5 0.6 1.2 12.6 1.7 −19.6 0.9 1.8 12.6 5.6 −17.1 −0.5 2.4 12.6 10.4 −13.5 −1.7 3.0 12.6 22.7 3.0 2.5
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Hongze Zhao, Guanghui Wei, Xue Du, Xiaodong Pan, Xuxu Lü. Prediction model of second-order intermodulation pseudo-signal interference effect for radar equipment[J]. High Power Laser and Particle Beams, 2023, 35(8): 083001
Paper Information
Category: High Power Microwave Technology
Received: Apr. 5, 2023
Accepted: May. 15, 2023
Published Online: Aug. 16, 2023
The Author Email: Wei Guanghui (wei-guanghui@sohu.com)
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