volume | PIER Journals

Abstract

Propagation mechanisms for short range, low altitude conditions are reviewed for their use in communications of unmanned aerial vehicles (UAVs). This study is based on measurements conducted in an obstacle-free area. The testbed is made up of a testing UAV (in particular a drone) and a set of four ground station terminals (GSTs) located in a football field; the antenna heights of radios (onboard the drone and GSTs) are equal to 1.4 m and the maximum distance between them is 50 m. Under these conditions, a plane earth geometry is well suited, and therefore the two-ray propagation model is considered. Measurement results for a radial configuration of the drone with respect to a ground station follow the trend of this model, but with a shift, which is attributed to the scattering from the grass. Then, an adjusted two-ray model is proposed for which experiments report good results. For another configuration where the drone has different positions in a square area of 30 × 30 m and there are four ground stations in the corners of the square, the general trend of the power decay of measurement results follows this model, but in some positions a difference around it is found even for locations at the same distance drone-GTSs. This behavior is attributed to the interaction of the print circuit board to the radiation characteristics of the antenna used in the radios. Thus, this effect is also analyzed by simulations, whose results show a deformation of the antenna radiation pattern, concentrating the energy in a certain direction and reducing it in another.

1. Li, B., F. Zesong, and Y. Zhang, "UAV communications for 5G and beyond: Recent advances and future trends," IEEE Internet of Things Journal, Vol. 6, No. 2, 2241-2263, April 2019.
doi:10.1109/JIOT.2018.2887086

2. Zeng, Y., Q. Wu, and R. Zhang, "Accessing from the sky: A tutorial on UAV communications for 5G and beyond," Proceedings of the IEEE.

3. Tatar Mamaghani, M. and Y. Hong, "On the performance of low-altitude UAV-enabled secure AF relaying with cooperative jamming and SWIPT," IEEE Access, Vol. 7, 153060-153073, October 2019.

4. Parsons, J. D., The Mobile Radio Propagation Channel, John Wiley & Sons, 1992.

5. Dehghan, S. M. M. and H. Moradi, "A geometrical approach for aerial cooperative obstacle mapping using RSSI observations," RSI/ISM International Conference on Robotics and Mechatronics, 197-202, October 2014.

6. Simunek, M., F. Perez Fontan, and P. Pechac, "The UAV low elevation propagation channel in urban areas: Statistical analysis and time-series generator," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 7, 3850-3858, July 2013.
doi:10.1109/TAP.2013.2256098

7. Virone, G., A. M. Lingua, M. Piras, A. Cina, F. Perini, J. Monari, F. Paonessa, O. A. Peverini, G. Addamo, and R. Tascone, "Antenna pattern verification system based on a micro Unmanned Aerial Vehicle (UAV)," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 169-172, 2014.
doi:10.1109/LAWP.2014.2298250

8. Siebert, S. and J. Teizer, "Mobile 3D mapping for surveying earthwork projects using an Unmanned Aerial Vehicle (UAV) system," Automation in Construction, Vol. 41, 1-14, 2014.
doi:10.1016/j.autcon.2014.01.004

9. Sankaran, S., L. R. Khot, C. Zuiga Esponoza, et al. "Low-altitude, high resolution aerial imaging systems for row and field crop phenotyping: A review," European Journal of Agronomy, Vol. 70, 112-123, 2015.
doi:10.1016/j.eja.2015.07.004

10. Motlagh, N. H., T. Taleb, and O. Arouk, "Low-altitude unmanned aerial vehicles-based internet of things services: Comprehensive survey and future perspectives," IEEE Internet of Things Journal, Vol. 3, No. 6, 822-899, December 2016.

11. Koparan, C., A. B. Koc, C. V. Privette, and C. B. Sawyer, "In situ water quality measurements using an Unmanned Aerial Vehicle (UAV) system," Water, Vol. 10, No. 3, 264, 2018.
doi:10.3390/w10030264

12. Qiu, Z., X. Chu, C. Calvo-Ramirez, C. Briso, and X. Yin, "Low altitude UAV air-to-ground channel measurement and modeling in semiurban environments," Wireless Communication and Mobile Computing, Vol. 2017, 1-11, 2017.
doi:10.1155/2017/1587412

13. Green, E. and M. Hata, "Microcellular propagation measurements in an urban environment," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 324-328, 1991.
doi:10.1109/PIMRC.1991.571510

14. Xia, H. H., H. L. Bertoni, L. R. Maciel, A. Lindsay-Stewart, and R. Rowe, "Radio propagation characteristics for line-of-sight microcellular and personal communications," IEEE Transactions on Antennas and Propagation, Vol. 41, No. 10, 1439-1447, October 1993.
doi:10.1109/8.247785

15. Perera, S. C. M., A. G. Williamson, and G. R. Rowe, "Prediction of breakpoint distance in microcellular environments," Electronics Letters, Vol. 35, No. 14, 1135-1136, July 1999.
doi:10.1049/el:19990834

16. Masui, H., T. Kobayashi, and M. Akaike, "Microwave path-loss modeling in urban line-of-sight environments," IEEE Journal on Selected Areas in Communications, Vol. 20, No. 6, 1151-1155, August 2002.
doi:10.1109/JSAC.2002.801215

17. Jordan, E. C. and K. G. Balman, Electromagnetic Waves and Radiating Systems, 2nd Ed., Prentice-Hall, 1968.

18. McFarlane, D. A. and S. T. S. Chia, "Microcellular mobile radio systems," British Telecom Technology Journal, Vol. 8, No. 1, 79-84, January 1990.

19. Green, E., "Radio link design for microcellular systems," British Telecom Technology Journal, Vol. 8, No. 1, 85-96, January 1990.

20. Xia, H. H., H. L. Bertoni, L. R. Maciel, A. Lindsay-Stewart, and R. Rowe, "Microcellular propagation characteristics for personal communications in urban and suburban environments," IEEE Transactions on Vehicular Technology, Vol. 43, No. 3, 743-752, August 1996.
doi:10.1109/25.312772

21. http://www.taoglas.com/product/gw-59-2-45-8ghz-3dbi-dipole-antenna-rp-smam-hinged/.

22. Feuerstein, M. J., K. L. Blackard, T. S. Rappaport, S. Y. Seidel, and H. H. Xia, "Path loss, delay spread, and outage models as functions of antenna height for microcellular system design," IEEE Transactions on Vehicular Technology, Vol. 43, No. 3, 487-498, August 1994.
doi:10.1109/25.312809

23. Blackard, K. L., M. J. Feuerstein, T. S. Rappaport, S. Y. Seidel, and H. H. Xia, "Path loss and delay spread models as functions of antenna height for microcellular system design," IEEE 42nd Vehicular Technology Conference, 333-337, May 1992.

24. Recommendation ITU-R P.527-4 "Electrical characteristics of the surface of the Earth," International Telecommunication Union, Radiocommunication Sector of ITU, P Series, Radiowave Propagation, 1–19, June 2017.

25. Sjoholm, J. and K. Palmer, Angular momentum of electromagnetic radiation: Fundamental physics applied to the radio domain for innovative studies of space and development of new concepts in wireless communications, Diploma Thesis, Uppsala School of Engineering and Department of Astronomy and Space Physics, Uppsala University, Sweden, 1–186, May 2007.

26. Lymberopoulos, D., Q. Lindsey, and A. Savvides, "An empirical characterization of radio signal strength variability in 3-D IEEE 802.15.4 networks using monopole antennas," European Workshop on Wireless Sensor Networks, 326-341, 2006.
doi:10.1007/11669463_24

27. Galvan-Tejada, G. M., R. Flores-Leal, F. Sanchez-Gomez, and V. Barrera-Figueroa, "On the importance of the vertical radiation pattern on simulations of WSNs," 2016 13th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE), 1-6, September 2016.

Dr. Giselle M. Galvan-Tejada

Dr. Jorge E. Aviles-Mejia

Dr. Aldo G. Orozco-Lugo

Dr. Luis A. Arellano-Cruz

Dr. Ruben Flores-Leal

Dr. Rogelio Lozano-Leal