TY - JOUR
T1 - Estimation of allowable path-deviation time in free-space optical communication links using various aircraft trajectories
AU - Kim, Chul Han
N1 - Publisher Copyright:
© 2019 Current Optics and Photonics.
PY - 2019
Y1 - 2019
N2 - The allowable path-deviation time of aircraft in a free-space optical communication system has been estimated from various trajectories, using different values of aircraft speeds and turn rates. We assumed the existence of a link between the aircraft and a ground base station. First, the transmitter beam’s divergence angle was calculated through two different approaches, one based on a simple optical-link equation, and the other based on an attenuation coefficient. From the calculations, the discrepancy between the two approaches was negligible when the link distance was approximately 110 km, and was under 5% when the link distance ranged from 80 to 140 km. Subsequently, the allowable path-deviation time of the aircraft within the tracking-error tolerance of the system was estimated, using different aircraft speeds, turn rates, and link distances. The results indicated that the allowable path-deviation time was primarily determined by the aircraft’s speed and turn rate. For example, the allowable path-deviation time was estimated to be ~3.5 s for an aircraft speed of 166.68 km/h, a turn rate of 90°/min, and a link distance of 100 km. Furthermore, for a constant aircraft speed and turn rate, the path-deviation time was observed to be almost unchanged when the link distance ranged from 80 to 140 km.
AB - The allowable path-deviation time of aircraft in a free-space optical communication system has been estimated from various trajectories, using different values of aircraft speeds and turn rates. We assumed the existence of a link between the aircraft and a ground base station. First, the transmitter beam’s divergence angle was calculated through two different approaches, one based on a simple optical-link equation, and the other based on an attenuation coefficient. From the calculations, the discrepancy between the two approaches was negligible when the link distance was approximately 110 km, and was under 5% when the link distance ranged from 80 to 140 km. Subsequently, the allowable path-deviation time of the aircraft within the tracking-error tolerance of the system was estimated, using different aircraft speeds, turn rates, and link distances. The results indicated that the allowable path-deviation time was primarily determined by the aircraft’s speed and turn rate. For example, the allowable path-deviation time was estimated to be ~3.5 s for an aircraft speed of 166.68 km/h, a turn rate of 90°/min, and a link distance of 100 km. Furthermore, for a constant aircraft speed and turn rate, the path-deviation time was observed to be almost unchanged when the link distance ranged from 80 to 140 km.
KW - Beam-divergence angle
KW - Free-space optical communication
KW - Path-deviation time
KW - Tracking error
UR - http://www.scopus.com/inward/record.url?scp=85069513495&partnerID=8YFLogxK
U2 - 10.3807/COPP.2019.3.3.210
DO - 10.3807/COPP.2019.3.3.210
M3 - Article
AN - SCOPUS:85069513495
SN - 2508-7266
VL - 3
SP - 210
EP - 214
JO - Current Optics and Photonics
JF - Current Optics and Photonics
IS - 3
ER -