Analysis of Airborne VHF/UHF Incidental Noise over Metropolitan Areas

The computation of VHF band incidental radio noise levels over the centers of several cities, based upon measured surface noise data, is performed and the results compared with airborne data at several frequencies, altitudes, and urban locations. The functional dependence of airborne incidental noise upon detector altitude is computed and compared with available VHF measurements. Comparison is also made between man-made surface noise power density obtained from both airborne and surface measurements. Finally, the use of airborne measurements for determining surface incidental noise distributions in urban areas is noted and discussed.