50 



TROPOSPHERIC REFRACTION 



Figure 3.1. Geometry of the refraction of radio waves. 



elevation angle, ^o, to a target, as indicated by radar, and the true eleva- 

 tion angle. Under the same assumptions made previously, e is given as a 

 function of r, n, and by 



e = Arctan 



cos T — sin T(tan 6) — 



tan ^0 — sin t — cos r tan 



(3.3) 



