Synthetic Doppler Radar for Coal Interface Detection.
Paper in Proceedings of the Ninth WVU Internat'lmining Electrotechnology Conf Morgantown WV :5 pages
To provide a safer work environment and efficient minerals extraction, the U.S. Bureau of Mines is investigating the application of automation and robotics for mining. The capabilities of robotic mining systems cannot be used unless an improved coal interface detector is developed. Previous research has investigated various radar sensor systems using video pulse, pulse doppler, and frequency modulated-containers wave radar technology. However, these systems have had limited resolution and have required advanced knowledge of the coal dielectric constant. New research by the Bureau has shown that the resolution limits of previous systems may be overcome by a modified synthetic doppler radar system using several fixed antennas. The system fully utilizes the information contained in both the amplitude and phase of the reflected signal through digital signal processing techniques, and uses a new antenna concept that provides increased information from the geometric advantage created by several small antennas. This paper describes the synthetic doppler radar technique and shows how the system can be applied to coal interface detection to resolve both the coal dielectric constant and the coal thickness. The research to date has been investigating and comparing computer correlation algorithms with several modeling theories and test data gathered using a network analyzer and simple dipole transmitting and receiving antennas.
Paper in Proceedings of the Ninth WVU Internat'lmining Electrotechnology Conf, Morgantown, WV