NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Parameter Impact on Sharing Studies Between UAS CNPC Satellite Transmitters and Terrestrial SystemsIn order to provide a control and non-payload communication (CNPC) link for civil-use unmanned aircraft systems (UAS) when operating in beyond-line-of-sight (BLOS) conditions, satellite communication links are generally required. The International Civil Aviation Organization (ICAO) has determined that the CNPC link must operate over protected aviation safety spectrum allocations. Although a suitable allocation exists in the 5030-5091 MHz band, no satellites provide operations in this band and none are currently planned. In order to avoid a very lengthy delay in the deployment of UAS in BLOS conditions, it has been proposed to use existing satellites operating in the Fixed Satellite Service (FSS), of which many operate in several spectrum bands. Regulatory actions by the International Telecommunications Union (ITU) are needed to enable such a use on an international basis, and indeed Agenda Item (AI) 1.5 for the 2015 World Radiocommunication Conference (WRC) was established to decide on the enactment of possible regulatory provisions. As part of the preparation for AI 1.5, studies on the sharing FSS bands between existing services and CNPC for UAS are being contributed by NASA and others. These studies evaluate the potential impact of satellite CNPC transmitters operating from UAS on other in-band services, and on the potential impact of other in-band services on satellite CNPC receivers operating on UAS platforms. Such studies are made more complex by the inclusion of what are essentially moving FSS earth stations, compared to typical sharing studies between fixed elements. Hence, the process of determining the appropriate technical parameters for the studies meets with difficulty. In order to enable a sharing study to be completed in a less-than-infinite amount of time, the number of parameters exercised must be greatly limited. Therefore, understanding the impact of various parameter choices is accomplished through selectivity analyses. In the case of sharing studies for AI 1.5, identification of worst-case parameters allows the studies to be focused on worst-case scenarios with assurance that other parameter combinations will yield comparatively better results and therefore do not need to be fully analyzed. In this paper, the results of such sensitivity analyses are presented for the case of sharing between UAS CNPC satellite transmitters and terrestrial receivers using the Fixed Service (FS) operating in the same bands, and the implications of these analyses on sharing study results.


Document ID
20150011446
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Kerczewski, Robert J.
(NASA Glenn Research Center Cleveland, OH United States)
Wilson, Jeffrey D.
(NASA Glenn Research Center Cleveland, OH United States)
Bishop, William D.
(Jacobs Engineering Group, Inc. Pasadena, CA, United States)
Date Acquired
June 23, 2015
Publication Date
April 21, 2015
Subject Category
Electronics And Electrical Engineering
Aircraft Communications And Navigation
Report/Patent Number
GRC-E-DAA-TN22556
Meeting Information
Meeting: 2015 ICNS Conference
Location: Herndon, VA
Country: United States
Start Date: April 21, 2015
End Date: April 23, 2015
Sponsors: Air Traffic Control Association (ATCA), American Inst. of Aeronautics and Astronautics, Institute of Electrical and Electronics Engineers, NASA Glenn Research Center
Funding Number(s)
CONTRACT_GRANT: NNC14BA04B
WBS: WBS 425425.01.01.03
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
air traffic control
aircraft communications
radiofrequency spectrum
No Preview Available