Location Variability of Transmission Loss Land Mobile and Broadcast Systems

This report summarizes the results of a number of studies of path-to-path, or location, variability of transmission loss at 20 MHz to 10 GHz. The studies show that such variability appears to be normally distributed and can, therefore, be represented by a standard deviation. Location variability increases with increased frequency and terrain irregularity, the standard deviation increasing from about 5 to 25 dB. For non-urban areas an expression is given which defines location variability in terms of radio frequency and terrain irregularity. The effects of tall buildings in highly built-up urban areas, and of trees are discussed.

[1]  J. Egli.  Radio Propagation above 40 MC over Irregular Terrain , 1957, Proceedings of the IRE.

[2]  Sensor Path Loss Measurements Analysis and Comparison with Propagation Models , 1975 .

[3]  A. G. Longley,et al.  PREDICTION OF TROPOSPHERIC RADIO TRANSMISSION LOSS OVER IRREGULAR TERRAIN. A COMPUTER METHOD-1968 , 1968 .

[4]  H. Dougherty,et al.  VHF propagation measurements in the Rocky mountain region , 1956, IRE Transactions on Vehicular Communications.

[5]  G. Waldo.  Report on the analysis of measurements and observations, New York city UHF TV project , 1963 .

[6]  D. Hutton.  Report on mobile field strength measurements, New York city UHF TV project , 1963 .

[7]  Tabulations of Propagation Data Over Irregular Terrain in the 230-to 9200-MHz Frequency Range. Part IV. Receiver Site in Grove of Trees , 1971 .

[8]  Robert S. Kirby.  Measurement of Service Area for Television Broadcasting , 1957 .

[9]  H. T. Head,et al.  The Measurement of Television Field Strengths in the VHF and UHF Bands , 1960, Proceedings of the IRE.

[10]  D. Reudink,et al.  Some characteristics of mobile radio propagation at 836 MHz in the Philadelphia area , 1972 .

[11]  Anita G. Longley.  Comparison of Propagation Measurements with Predicted Values in the 20 to 10,000 MHz Range , 1970 .

[12]  Ground-wave field-strength surveys at 100 and 600 Mc/s , 1954 .

[13]  M. F. Wazowicz,et al.  Some Propagation Experiments Relating Foliage Loss and Diffraction Loss at X-Band and UHF Frequencies , 1973, IEEE Trans. Commun..

[14]  E. A. Neham.  An approach to estimating land mobile radio coverage , 1974 .