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GPS and Galileo Developments on Board the International Space Station With the Space Communications and Navigation (SCaN) Testbed
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Author and Affiliation:
Pozzobon, Oscar(Qascom, Bassano del Grappa, Italy)
Fantinato, Samuele(Qascom, ESA, Bassano del Grappa, Italy)
Dalla Chiara, Andrea(Qascom, ESA, Bassano del Grappa, Italy)
Gamba, Giovanni(Qascom, ESA, Bassano del Grappa, Italy)
Crisci, Massimo(European Space Agency. European Space Research and Technology Center, ESTEC, Noordwijk, Netherlands)
Giordana, Pietro(European Space Agency. European Space Research and Technology Center, ESTEC, Noordwijk, Netherlands)
Enderle, Werner(European Space Agency. European Space Research and Technology Center, ESTEC, Noordwijk, Netherlands)
Chelmins, David(NASA Glenn Research Center, Cleveland, OH United States)
Sands, Obed S.(NASA Glenn Research Center, Cleveland, OH United States)
Clapper, Carolyn J.(NASA Glenn Research Center, Cleveland, OH United States) Show more authors
Abstract: The Space Communications and Navigation (SCaN) is a facility developed by NASA and hosted on board the International Space Station (ISS) on an external truss since 2013.It has the objective of testing navigation and communication experimentations with a Software Defined Radio (SDR) approach, which permits software updates for testing new experimentations.NASA has developed the Space Telecommunications Radio System (STRS) architecture standard for SDRs used in space and ground-based platforms to provide commonality among radio developments to provide enhanced capability. The hardware is equipped with both L band front-end radios and the NASA space network communicates with it using S-band, Ku-band and Ka-band links.In May 2016 Qascom started GARISS (GPS and Galileo Receiver for the ISS), an activity of experimentation in collaboration with ESA and NASA that has the objective to develop and validate the acquisition and processing of combined GPS and Galileo signals on board the ISS SCaN testbed. This paper has the objective to present the mission, and provide preliminary details about the challenges in the design, development and verification of the waveform that will be installed on equipment with limited resources. GARISS is also the first attempt to develop a waveform for the ISS as part of an international collaboration between US and Europe. Although the final mission objective is to target dual frequency processing, initial operations will foresee a single frequency processing. Initial results and trade-off between the two options, as well as the final decision will be presented and discussed. The limited resources on board the SCaN with respect to the challenging requirements to acquire and track contemporaneously two satellite navigation systems, with different modulations and data structure, led to the need to assess the possibility of aiding from ground through the S-band. This option would allow assistance to the space receiver in order to provide knowledge of GNSS orbits and reduce the processing on board. Trade off and various options for telemetry and uplink data are presented and discussed. Finally, integration and validation of the waveform are one of the major challenges of GARISS: The Experiment Development System (EDS) and the the Ground Integration Unit (GIU) for VV will be used prior to conducting the experiment on the ISS. The EDS can be used in lab environment and allows prototyping and verification activities with the simulator, but does not include all hardware components. The GIU on the other side is the flight model which replicates the flying equipment, but has limited flexibility for testing.As conclusion, the project is now approaching the Preliminary Design Review (PDR) and indeed only preliminary results are available. This paper is an opportunity to present the GARISS mission as part of an International cooperation between ESA, NASA and Qascom. The preliminary results include GPS and Galileo processing from space signals, the challenges and trade off decisions, the high level STRS architecture and foreseen experimentation campaign. Detailed results from the test campaigns are expected in 2017.
Publication Date: Oct 20, 2016
Document ID:
20170007290
(Acquired Aug 08, 2017)
Subject Category: AIRCRAFT COMMUNICATIONS AND NAVIGATION
Report/Patent Number: GRC-E-DAA-TN36397
Document Type: Oral/Visual Presentation
Meeting Information: 34th AIAA International Communications Satellite Systems Conference (ICSSC) 2016; 18-20 Oct. 2016; Cleveland, OH; United States
Meeting Sponsor: American Inst. of Aeronautics and Astronautics; Reston, VA, United States
Contract/Grant/Task Num: WBS 439432.07.01.15.07.02
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Description: 15p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: SPACE COMMUNICATION; TEST STANDS; GLOBAL POSITIONING SYSTEM; EXTREMELY HIGH FREQUENCIES; GROUND SUPPORT SYSTEMS; WAVEFORMS; COMPUTER PROGRAMS; SATELLITE CONSTELLATIONS; GALILEO SPACECRAFT; INTERNATIONAL SPACE STATION; SATELLITE NAVIGATION SYSTEMS; SIGNAL PROCESSING; ASSESSMENTS; MISSION PLANNING; SUPERHIGH FREQUENCIES; DOPPLER NAVIGATION
Other Descriptors: SPACE NAVIGATION
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