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| Interference Mechanism Analysis and Simulation Calculation of Underground Electromagnetic Signal to Civil Airport Navigation Station |
| Received:November 14, 2016 Revised:April 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.04.011 |
| KeyWord:electromagnetic interference navigation station interference mechanism |
| Author | Institution |
| YANG Qi-tao |
Southern War-Zone Air Force Survey and Design Institute, Guangzhou , China |
| LEI Wen-tai |
Central South University, Changsha , China |
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| Abstract: |
| Objective To study interference mechanism of underground electromagnetic signal to airport navigation station and carry out simulation calculation. Methods Distributed current model on antenna of navigation station was established. Influences of external electromagnetic interference on distributed current form were analyzed. Based on radiation principle of airport navigation station, influences of external electromagnetic interference on navigation station radiation pattern were studied and simulated, and influence of external electromagnetic interference on E-filed amplitude at route glide line were calculated. Results Underground electromagnetic signal propagated to the area of the airport navigation station antenna and caused that top load currents on both sides of the T-type antenna no longer satisfy the mirror-antisymmetric state. Field intensity in the field covered by T-antenna also changed. Radiation lobe splitting appeared in the non-directional diagram at horizontal plane and field intensity range received at the spatial point of air line glide also fluctuated. The fluctuating value shown in the simulation result reached up to 32.7%. Conclusion Underground electromagnetic signals cause interferences to non-directional beacon, resulting in radiation lobe splitting at horizontal plane and E-filed fluctuations on route glide line. Underground electromagnetic interference affects flight safety and needs to be suppressed by shielding. |
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