Space diversity and fade duration statistics at C-band for two overwater, line-of-sight propagation paths in the mid-Atlantic coast

1993 ◽  
Vol 41 (8) ◽  
pp. 1151-1155 ◽  
Author(s):  
J. Goldhirsh ◽  
G.D. Dockery ◽  
B.H. Musiani
Keyword(s):  
Atlantic Coast ◽  
Line Of Sight ◽  
Space Diversity ◽  
Line Of Sight Propagation ◽  
Propagation Paths

scholarly journals Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

2014 ◽  
Vol 14 (8) ◽  
pp. 2119-2124 ◽  
Author(s):  
K. Motojima ◽  
N. Haga
Keyword(s):  
Line Of Sight ◽  
Very High Frequency ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Line Of Sight Propagation ◽  
Propagation Paths ◽  
Anomalous Propagation ◽  
Radio Band ◽  
Very High

Abstract. This paper was intended to find out any relation between anomalous line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long term. For that purpose, a multidirectional VHF band monitoring system was established and utilized. Anomalous line-of-sight propagation on the VHF band was distinguished from the monitored wave by using a statistical analysis. After the stochastic consideration, it was found out that earthquakes associated with anomalous propagation were characterized by magnitude of earthquakes M ≥ 4.5, and distances from epicenters L ≤ 75 km. The anomalous propagation was monitored on the VHF band a few days before the associated earthquakes occurred. Moreover, the anomaly appeared on multidirectional propagation paths simultaneously. The anomaly on the line-of-sight propagation indicates the possibility of narrowly focusing the area of the epicenter of earthquake.

scholarly journals Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes

2013 ◽  
Vol 1 (6) ◽  
pp. 6829-6848
Author(s):  
K. Motojima ◽  
N. Haga
Keyword(s):  
Statistical Analysis ◽  
Monitoring System ◽  
Line Of Sight ◽  
Radio Broadcasting ◽  
Fm Radio ◽  
Line Of Sight Propagation ◽  
Propagation Paths ◽  
Anomalous Propagation ◽  
Radio Band

Abstract. This paper was intended to find out any relation between anomalous line-of-sight propagation on the VHF band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long term. For that purpose, a multidirectional VHF band monitoring system was established and utilized. Anomalous line-of-sight propagation on the VHF band was distinguished from the monitored wave by using a statistical analysis. After the stochastic consideration, it was found out that earthquakes associated with anomalous propagation were characterized by magnitude of earthquakes M ≥ 4.5, and distances from epicenters L ≤ 75 km. The anomalous propagation was monitored on the VHF band a few days earlier the associated earthquakes occurred. Moreover, the anomaly appeared on multidirectional propagation paths simultaneously. The anomaly on the line-of-sight propagation indicates possibility of narrow focusing the area of epicenter of earthquake.

Three years of C band signal measurements for overwater, line-of-sight links in the mid-Atlantic coast: 1. Fade statistics

Radio Science ◽  
1994 ◽  
Vol 29 (6) ◽  
pp. 1421-1431 ◽  
Author(s):  
Julius Goldhirsh ◽  
G. Daniel Dockery ◽  
Bert H. Musiani
Keyword(s):  
Atlantic Coast ◽  
Line Of Sight ◽  
Fade Statistics ◽  
Band Signal
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