JPL's Wireless Communication Reference Website Slide Show


Space wave approximation

Distance between TX and RX antenna = Ö{( ht - ht)2 + d2}

Distance between TX and mirrored RX antenna =

Ö{( ht + ht)2 + d2}}

The phase difference D is

At large a distance, >> 5ht hr,

so, the received signal power is

 

 

Two-ray model (space wave approximation)

The reflection coefficient approaches Rc ® -1 for

 

 

For large distances d ® ¥: D ® 0 and Rc ® -1.

In this case, LOS and ground-reflected wave cancel!!




JPL's Wireless Communication Reference Website © Jean-Paul M.G. Linnartz, 1993, 1995.