Vol. 12

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2010-05-03

Path Loss Modeling for Near-Ground VHF Radio-Wave Propagation through Forests with Tree-Canopy Reflection Effect

By Yu Song Meng, Yee Hui Lee, and Boon Chong Ng
Progress In Electromagnetics Research M, Vol. 12, 131-141, 2010
doi:10.2528/PIERM10040905

Abstract

This paper presents a new methodology to model the near-ground short-range propagation loss in forested areas at the VHF and the UHF band. The path loss modeling is performed by an integration of the foliage induced effect and the effect from the radio-wave reflection/reflections. The analysis shows that the reflection from the dense tree canopy is important for short-range propagation at the VHF band and therefore, cannot be ignored. When taking into consideration the contribution from the possible tree-canopy reflection, the modeled path loss is reduced by more than 15 dB in the VHF band. A good agreement of the modeled path loss with the measured loss in tropical forested areas is achieved.

Citation


Yu Song Meng, Yee Hui Lee, and Boon Chong Ng, "Path Loss Modeling for Near-Ground VHF Radio-Wave Propagation through Forests with Tree-Canopy Reflection Effect," Progress In Electromagnetics Research M, Vol. 12, 131-141, 2010.
doi:10.2528/PIERM10040905
http://jpier.org/PIERM/pier.php?paper=10040905

References


    1. Li, L. W., T. S. Yeo, P. S. Kooi, M. S. Leong, and J. H. Koh, "Analysis of electromagnetic wave propagation in forest environment along multiple paths ," Journal of Electromagnetic Waves and Applications, Vol. 13, No. 8, 1057-1059, 1999.
    doi:10.1163/156939399X01212

    2. Liao, D. and K. Sarabandi, "Modeling and simulation of near-earth propagation in presence of a truncated vegetation layer," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 3, 949-957, 2007.
    doi:10.1109/TAP.2007.891812

    3. Li, Y. and H. Ling, "Numerical modeling and mechanism analysis of VHF wave propagation in forested environments using the equivalent slab model," Progress In Electromagnetics Research, Vol. 91, 17-34, 2009.
    doi:10.2528/PIER09012306

    4. Goldman, J. and Jr. G. W. Swenson, "Radio wave propagation through woods," IEEE Antennas and Propagation Magazine, Vol. 41, No. 5, 34-36, 1999.
    doi:10.1109/74.801512

    5. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Near ground channel characterization and modeling for a tropical forested path," Proc. XXIXth URSI General Assembly, Chicago, USA, Aug. 2008.

    6. Joshi, G. G., C. B. Dietrich, C. R. Anderson, W. G. Newhall, W. A. Davis, J. Isaacs, and G. Barnett, "Near-ground channel measurements over line-of-sight and forested paths," IEE Microwaves, Antennas and Propagation, Vol. 152, No. 6, 589-596, 2005.
    doi:10.1049/ip-map:20050013

    7. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Empirical near ground path loss modeling in a forest at VHF and UHF bands," IEEE Transactions on Antennas and Propagation, Vol. 57, No. 5, 1461-1468, 2009.
    doi:10.1109/TAP.2009.2016703

    8. Tamir, T., "On radiowave propagation in forest environments," IEEE Transactions on Antennas and Propagation, Vol. 15, No. 6, 806-817, 1967.
    doi:10.1109/TAP.1967.1139054

    9. Lee, W. C. Y., Mobile Communications Engineering: Theory and Applications, McGraw-Hill, 1998.

    10. Meeks, M. L., "VHF propagation over hilly, forested terrain," IEEE Transactions on Antennas and Propagation, Vol. 31, No. 3, 483-489, 1983.
    doi:10.1109/TAP.1983.1143066

    11. Weissberger, M. A., "An initial critical summary of models for predicting the attenuation of radio waves by foliage," ECAC-TR-81-101, Electromagnetic Compatibility Analysis Center, USA, 1981.

    12. CCIR, "Influences of terrain irregularities and vegetation on troposphere propagation," CCIR Report, 235-236, Geneva, 1986.

    13. COST235, "Radio propagation effects on next-generation fixed-service terrestrial telecommunication systems," Final Report, Luxembourg, 1996.

    14. Meng, Y. S., Y. H. Lee, and B. C. Ng, "Study of propagation loss prediction in forest environment," Progress In Electromagnetics Research B, Vol. 17, 117-133, 2009.
    doi:10.2528/PIERB09071901

    15. Sarabandi, K. and I. S. Koh, "Effect of canopy-air interface roughness on HF-VHF wave propagation in forest," IEEE Transactions on Antennas and Propagation, Vol. 50, No. 2, 111-121, 2002.
    doi:10.1109/8.997979