Location Statistics of AM Broadcast Groundwave Signal Amplitudes

A location-dependent statistical distribution model for AM broadcast groundwave signal amplitudes is presented. The distribution is in the fonm of a probability density function (pdf) whose expected value is the predicted feld strength based on propagation formulas, and whose variance can be empirically derived from analysis of actual groundwave field strength measurements. The results are useful for aessing the percentage of locations at which a selected signal strength will be exceeded given the predicted signal strength and typical variance of the pdf.