Title :
Estimation of signal levels in evaporation ducts using ray theory and their comparison with experimental measurements
Author :
Prasad, M.V.S.N. ; Pasricha, P.K. ; Ghosh, A.B. ; Reddy, B.M.
Author_Institution :
Nat. Phys. Lab., New Delhi, India
Abstract :
A comprehensive computer program based on ray theory, has been developed for the estimation of signal levels in an evaporation duct. The computations were made for a radar situated near Indian east coast operating at a frequency of 3 GHz with an output power of 75 kW. The two ray interference theory coupled with the basic ray tracing technique is utilized to carry out the propagation loss computations. These are compared with the signal levels observed with the radar under anomalous conditions. Radar ranges up to 100 km in an evaporation duct can be explained with the help of the ray tracing program developed. The program can not be applied to explain radar ranges about 500 km and more and a wave hop method is required for which work is in progress
Keywords :
atmospheric electromagnetic wave propagation; computer aided analysis; radiowave propagation; telecommunications computing; 3 GHz; 75 kW; India; SHF; anomalous conditions; computer program; evaporation ducts; experimental measurements; output power; propagation loss; radar; ray tracing; signal levels estimation; two ray interference theory;
Conference_Titel :
Antennas and Propagation, 1989. ICAP 89., Sixth International Conference on (Conf. Publ. No.301)
Conference_Location :
Coventry
