NOVEL TECHNIQUE FOR LOCATING AN INTRUDER IN 3D ENVIRONMENTS BY USING A COOPERATIVE SYSTEM OF MULTISTATIC RADARS
Keywords:Pinpointing of intruder’s position, vector technique, multistatic rada, monopole antenna, dipole antenna, indoor sensors, double-floor residence
The aim of this work is to present a new methodology, based on vector and geometrical techniques, for determining the position of an intruder in a residence (3D problem). Initially, modifications in the electromagnetic responses of the environment, caused by movements of the trespasser, are detected. It is worth mentioning that slight movements are detected by high frequency components of the used pulse. The differences between the signals (before and after any movement) are used to define a sphere and ellipsoids, which are used for estimating the position of the invader. In this work, multiple radars are used in a cooperative manner. The multiple estimates obtained are used to determine a mean position and its standard deviation, introducing the concept of sphere of estimates. The electromagnetic simulations were performed by using the FDTD method. Results were obtained for single and double floor residences.
Welch, T. B., Mulsselman, R. L., Emessiene, B. A., Gift, P. D., et al, "The effects of the human body on UWB signal propagation in an indoor environment``, IEEE Journal on Selected Areas in Commun, vol.20, No 9, December, 2002.
Müller, F.C.B.F., Farias, R.G., Sobrinho, C.L.S.S., Dmitriev, V., "FDTD Simulation of a Multistatic Radar Using Ultra- Wideband Pulses for Indoor Environments``, Microwave and Optical Technology Letters, Texas A&M University, College, v. 45, n. 5, p. 430-434, 2005.
Paolini, E., Giorgetti, A., Chiani, M., Minutolo, R., Montanari, M., "Localization Capability of Cooperative Antiintruder Radar Systems``, Journal on Advances in Signal Processing, August, 2007.
Yee, K.S., "Numerical Solution of Initial Boundary Value Problems Involving Maxwell's Equations in Isotropic Media, ``IEEE Trans. Antennas Propagat., vol. AP-14, pp. 302-307, May 1966.
Gedney, S. D., "An Anisotropic Perfectly Matched Layer â€“ Absorbing Medium for the Truncation of FDTD Lattices``, IEEE Trans. Antennas Propagat., vol. AP-44, No. 12, pp. 1630-1639, Dezembro, 1996.
Kondylis, G. D., "On Indoor Wireless Channel Characterization and the Design of Interference Aware Medium Access Control Protocols for Packet Switched Networks,`` University of California, Los Angeles, 2000.
Oliveira, R. M. S., Sobrinho, C.L.S.S., Araújo, J. S., Farias, R. G., Particle Swarm Optimization, InTech Education and Publishing, Chapter 11, pp. 183-202, 2009.
Petroff A., and Withington, P., PulsOn Technology Overview, 2001, http://w.w.w.timedomain.com/files/downloads/techpapers/PulsONOverview7_01.pdf.
Gandhi, O. P., Lazzi, G., and Furse, C. M., Electromagnetic absorption in the human head and neck for mobile telephones at 835 and 1900 MHz, IEEE Trans. Microwave Theory and Tech., vol. MTT-44, No. 10, October 1996.
Umashankar, K. R., "Calculation and experimental validation of induced currents on coupled wires in an arbitrary shaped cavity,`` IEEE Trans. Antennas and Propagation, vol. 35, pp. 1248â€“1257, 1987.
Jackson, M. C., "The Geometry of Bistatic Radar System``, IEE Proceedings, vol. 133, no. 7, December, 1986.