Page 112 - Integrated Wireless Propagation Models

90 C h a p t e r T w o

ITU-R P.1411 Propagation data and prediction methods for the planning of short-range
outdoor radio communication systems and radio local area networks n
i
t h e frequency range 0 0 MHz o 100 GHz
t
3
ITU-R P.1546 Method for point-to-area predictions for terrestrial services in the
frequency range 30 MHz to 3000 H z
M
u
ITU-R P.530 Propagation data and prediction methods req i r ed for the design of
l
terrestrial i n e-of-sight systems
ITU-R P.341 UHF frequency range, basic transmission loss
ITU-R P.676 Gaseous attenuation
ITU-R P.526 Knife-edge diffraction
ITU-R P.833 Propagation through trees specific attenuation n vegetation
i
ITU-R P.679 Building entry for terrestrial systems
n
ITU-R P.1057 Defi i tions of probability distributions
ITU-R P.1238 I n door propagation over the frequency range 900 MHz to 100 GHz
ITU-R P.370 Propagation for over distances of 1 km and greater, and over the
and ITU-R P.529 frequency range 30 MHz to 3 GHz
n
ITU-R P.1407 M u l ti path propagation and defi i tion of terms
ITU-R P.453 Effects of refraction
TABLE 2.17.1 ITU-R Recommendations Table

2 . 1 7 . 1 IT - R Recommendation 1 54631
U
P.
This is the recommendation of ITU-R P.1546 for point-to-area prediction of field strength
for broadcasting, land mobile, maritime mobile, and certain fixed services, such as point­
to-multipoint systems. This model uses a semiempirical method for the reliable predic­
tion of radio propagation at VHF and UHF bands. It covers point-to-area predictions for
terrestrial services in the frequency range 30 to 3000 MHz and for the distance range of
1 to 1000 km.
This method can include the effects of terrain, scattering objects of the environment,
and other propagation conditions, among various factors and corrections. There are
21 tunable parameters in the point-to-area prediction method of ITU-R P.1546, provid­
ing a high degree of freedom for tuning the model.
The propagation curves represent field strength values for 1 kW of ERP at nomi­
nal frequencies of 100, 600, and 2000 MHz, respectively, as function of various param­
eters, including frequency, transmitting antenna height (10 to 1200 m), time variability
(percentage of time exceeded 50, 10, and 1 percent), and path type (land, cold sea, and
warm sea), the height of the receiving (mobile) antenna being equal to the representa­
tive height of ground cover and distance. These curves are based on measurement
data relating mainly to mean climatic conditions in temperate regions containing cold
and warm seas.
A rigorous interpolation/ extrapolation procedure is given to allow prediction for
any input values within the specified range. The model is based on series of curves (or
tables) originating from measurements and allowing predictions for wide area macro­
cells and for broadcasting and fixed wireless access applications.