국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Integrated RF/Optical Interplanetary Networking Preliminary Explorations and Empirical Results
저자	Raible, Daniel E.;; Hylton, Alan G.
Keyword	COMPUTER NETWORKS;; DEEP SPACE NETWORK;; MARS EXPLORATION;; OCCULTATION;; OPTICAL COMMUNICATION;; RADIO FREQUENCIES;; SCHEDULING;; TELECOMMUNICATION
URL	http://hdl.handle.net/2060/20130000792
보고서번호	NASA/TM-2012-216050
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Over the last decade interplanetary telecommunication capabilities have been significantly expandedspecifically in support of the Mars exploration rover and lander missions. NASA is continuing to drive advances in new, high payoff optical communications technologies to enhance the network to Gbps performance from Mars, and the transition from technology demonstration to operational system is examined through a hybrid RF/optical approach. Such a system combines the best features of RF and optical communications considering availability and performance to realize a dual band trunk line operating within characteristic constraints. Disconnection due to planetary obscuration and solar conjunction, link delays, timing, ground terminal mission congestion and scheduling policy along with space and atmospheric weather disruptions all imply the need for network protocol solutions to ultimately manage the physical layer in a transparent manner to the end user. Delay Tolerant Networking (DTN) is an approach under evaluation which addresses these challenges. A multi-hop multi-path hybrid RF and optical test bed has been constructed to emulate the integrated deep space network and to support protocol and hardware refinement. Initial experimental results characterize several of these challenges and evaluate the effectiveness of DTN as a solution to mitigate them.