Figure 5. Coordinate system for an airborne antenna, 0. 

 located at an altitude, h, above a surface distribution 

 of roan-made radio noise sources. 



Substitution of the dipole antenna power pattern into the integral representa- 

 tion of the airborne man-made noise power equation and further derivation for 

 offset, business locations performed in reference 2 yield the following param- 

 etric equations. 



For airborne man-made radio noise directly over a business area when the 

 ratio of altitude, h, to distance, d, is small the limit of the integral is 



Pj, = Pg - A In (h/h Q ) • 



(10) 



In the limit of large h/d the integral approaches 



Ph 



kh- 2 . 



(11) 



As h approaches infinity p reaches galactic noise as a limit. 



For airborne man-made radio noise offset from a business area in the 

 altitude range of < h < 7.5 miles, a second-order approximation of the inte- 

 gral is 



Ph - Pa + Bh - CH 3 



(12) 



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