干旱区生态环境知识资源中心(Arid): Detecting, Locating, and Characterizing Remote Power Sources

Arid

DOI	10.2172/917503
报告编号	UCRL-TR-209641
来源ID	OSTI_ID: 917503
	Detecting, Locating, and Characterizing Remote Power Sources
	Harben, P; Carrigan, C; Kirkendall, B; Simons, D
英文摘要	A feasibility study to determine range and back-azimuth detection methods for an isolated generator powering common loads was completed. The study deployed 3-component E and B field sensors with sampling rates of 100 kHz in a low noise test location in Southern California. Scripted power and load cycling was recorded at ranges of 40 meters to 4 km from the generator/load source. Three loads were tested: a 100 meter string of lights, an inverter powering an air blower, and a resistive heater. No E-field or B-field radiated signals were detected at ranges greater than 40 meters with a signal-to-noise ratio greater than one. Large variations in the broadband background electromagnetic noise were observed and may have been responsible for null detections at some measurement locations. At the 40-meter station, a frequency shift upon generator loading was observed for all load types. Harmonics from the detuned generator (operating at 56.7 Hz) could be observed for all load types but were most pronounced for the inverter source. A back-azimuth estimation methodology was applied to detected harmonics with stable and consistent results. For the inverter source, consistent back azimuths to the source were determined for the fundamental and higher detected harmonics up to the 31st. The method was applied to narrow band ''noise'' at 60 Hz and produced bimodal directions that roughly pointed to large population centers. Details of the method are withheld in this report pending a record of invention submittal. Although the generator/load combinations, which utilized wiring that tended to minimize stray signals, cannot yet be detected at large stand-off range without application of noise-filtering methods, the back-azimuth method appears promising and should be applied to other source types and frequency ranges where an E and B field can be detected. A record of invention describing this new back-azimuth method has been submitted to the Intellectual Property Law Group.
出版年	2005
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS ; AIR ; CALIFORNIA ; DETECTION ; FREQUENCY RANGE ; HARMONICS ; INVENTIONS ; INVERTERS ; METERS ; SAMPLING ; SIGNAL-TO-NOISE RATIO
URL	http://www.osti.gov/scitech/servlets/purl/917503
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/268906
推荐引用方式 GB/T 7714	Harben, P,Carrigan, C,Kirkendall, B,et al. Detecting, Locating, and Characterizing Remote Power Sources,2005.