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systemes de telecommunications - Martial COULON - Enseeiht

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77<br />

3 catégories <strong>de</strong> terrain :<br />

zone ouverte : pas <strong>de</strong> grands obstacles<br />

zone sub-urbaine : quelques obstacles (village, autoroutes,...)<br />

zone urbaine : beaucoup d’obstacles (villes)<br />

zone ouverte : LdB = A + B log R − E<br />

zone sub-urbaine : LdB = A + B log R − C<br />

zone urbaine : LdB = A + B log R − D<br />

A = 69.55 + 26.16 log fc − 13.82 log hb<br />

B = 44.9 − 6.55 log hb<br />

C = 2(log(fc/28)) 2 + 5.4<br />

D = 4.78(log fc) 2 + 18.33 log fc + 40.94<br />

E = 3.2(log(11.75hm)) 2 − 4.97 pour gran<strong>de</strong>s villes, fc ≥ 300MHz<br />

E = 8.29(log(1.54hm)) 2 − 1.1 pour gran<strong>de</strong>s villes, fc < 300MHz<br />

E = (1.1 log fc − 0.7)hm − (1.56 log fc − 0.8) pour petites et moyennes villes<br />

R = d.10 −3 , fc = f.10 −3<br />

<strong>Martial</strong> Coulon, ENSEEIHT, Systèmes <strong>de</strong> Télécommunications SCR, année 2007-2008

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