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|United States Patent||4,672,305|
|Coleman||June 9, 1987|
Electric (E) and magnetic (H) field components of a lightning stroke are separately received in order to determine and display the location of regions of recently occuring lightning activity. Direction is determined by operating upon electrical signals associated with both the E and H field components. Range is determined by measuring the magnitude of the H field at two different frequencies. The range is then computed as a function of the ratio of the magnitude of the H field at a first frequency to the magnitude of the H field at a second frequency.
|Inventors:||Coleman; Ernest W. (Phoenix, AZ)|
Ernco Industries, Inc.
|Filed:||December 14, 1984|
|Application Number||Filing Date||Patent Number||Issue Date|
|516288||Jul., 1983||4506211||Mar., 1985|
|235168||Feb., 1981||4422037||Dec., 1983|
|Current U.S. Class:||324/72 ; 324/76.12; 702/4|
|Current International Class:||G01W 1/00 (20060101); G01W 1/16 (20060101); G01R 29/08 (20060101); G01N 031/02 ()|
|Field of Search:||324/72,335,77R|
|4023408||May 1977||Ryan et al.|
|4115732||September 1978||Krider et al.|
|4156182||May 1979||Brick et al.|
|4198599||April 1980||Krider et al.|
|4245190||January 1981||Krider et al.|
|4395906||August 1983||Ryan et al.|
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