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Mining Publication: A Feasibility Study for the Detection of Weak Electromagnetic Signal/ Bursts With Hard-Limited Arrays
Keywords: Rescue Signalling Spectral analysis Statistical analysis
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: November 1981
Authors: M Kanefsky, AK Rajput
Contract/MOA Report - November 1981
Download PDF Document (1.57 MB)
NIOSHTIC2 Number: 10003948
University of Pittsburgh. U.S. Bureau of Mines Contract No. J0318033. NTIS No. PB/84-188846, 1981 Nov; :1-135
A prototype detector using electromagnetic signals for finding trapped miners has previously been built and tested. The signals are generated from transmitters carried on the miner's belt and powered by his head lamp battery and the receiver is a human listener. This system has been found to be very efficient for the detection and location of trapped miners in most existing mines. However, for very deep mines, they are not adequate. Unfortunately, the signals employed, while ideally suited for a human listener, is not useable for coherent detection schemes. The objective of this report was to investigate the use of a noncoherent detector based on the polarity-coincidence statistic. Two channel, polarity-coincidence and polarity-difference, statistics were analyzed. The signal, common to both channels, consists of sinusoidal bursts where the exact frequency of the signal is nearly known, but other parameters such as amplitude, phase, and pulse starting time are unknown. The noise inputs are dependent, narrow band, Markov processes. It is shown that the performance depends not only on the signal uncertainties, but on the precise shape of the cross-correlation functions between the noise inputs. By using two polarity-difference statistics in addition to the polarity-coincidence statistic, it is shown that the decrease in performance, as well as the cost of hard limiting due to correlated inputs, can be made small.
Image of publication A Feasibility Study for the Detection of Weak Electromagnetic Signal/ Bursts With Hard-Limited ArraysContract/MOA Report - November 1981
Download PDF Document (1.57 MB)
NIOSHTIC2 Number: 10003948
University of Pittsburgh. U.S. Bureau of Mines Contract No. J0318033. NTIS No. PB/84-188846, 1981 Nov; :1-135
See Also
Analytical Investigations of Electromagnetic Location Schemes Relevant to Mine Rescue: Part I - Executive Summary; Part II - Collected Reprints - Analytical Investigations of Electromagnetic Location Schemes Relevant to Mine Rescue
Detection of Trapped Miner Electromagnetic Signals Above Coal Mines
Development of a Phase Difference of Arrival Technique for Location of Trapped Miners
Development of a Seismic System for Locating Trapped Miners
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Electromagnetic Noise in Itmann Mine
Mine Rescue Training Facility Inventory - Compendium of Ideas to Improve US Coal Mine Rescue Training
Passive Fiber Optic System for Locating, Tracking, and Communicating with Personnel in Coal Mines
Refuge Alternatives in Underground Coal Mines
Refuge Chamber Deployment and Occupancy Status During Mine Emergency Situations
Page last reviewed: October 1, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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