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Distributed Timing and Localization (DiGiTaL)
NTRS Full-Text: Click to View  [PDF Size: 270 KB]
Author and Affiliation:
D'Amico, Simone(Stanford Univ., Dept. of Aeronautics and Astronautics, Space Rendezvous Lab (SLAB), Stanford, CA, United States)
Hunter, Roger C.(NASA Ames Research Center, Moffett Field, CA, United States)
Baker, Christopher(NASA, Washington, DC, United States)
Abstract: The Distributed Timing and Localization (DiGiTaL) system provides nano satellite formations with unprecedented,centimeter-level navigation accuracy in real time and nanosecond-level time synchronization. This is achieved through the integration of a multi-constellation Global Navigation Satellite System (GNSS) receiver, a Chip-Scale Atomic Clock (CSAC), and a dedicated Inter-Satellite Link (ISL). In comparison, traditional single spacecraft GNSS navigation solutions are accurate only to the meter-level due to the sole usage of coarse pseudo-range measurements. To meet the strict requirements of future miniaturized distributed space systems, DiGiTaL uses powerful error-cancelling combinations of raw carrier-phase measurements which are exchanged between the swarming nano satellites through a decentralized network. A reduced-dynamics estimation architecture on board each individual nano satellite processes the resulting millimeter-level noise measurements to reconstruct the fullformation state with high accuracy.
Publication Date: Aug 05, 2017
Document ID:
20170011077
(Acquired Nov 17, 2017)
Subject Category: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
Report/Patent Number: NASA FS-2017-03-03-ARC, ARC-E-DAA-TN45564
Document Type: Brief Communication/Note
Contract/Grant/Task Num: NNX14AO93G
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 2p; In English
Relation Information: NASA Fact Sheet
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Public use permitted
NASA Terms: TIME SYNCHRONIZATION; POSITION (LOCATION); NANOSATELLITES; SATELLITE CONSTELLATIONS; SMALL SATELLITE TECHNOLOGY; SPACE NAVIGATION; NAVIGATION SATELLITES; SATELLITE NAVIGATION SYSTEMS; DISTRIBUTED PROCESSING; ORBIT DETERMINATION; ERRORS; MILLIMETER WAVES; MINIATURIZATION; ATOMIC CLOCKS; COMPUTER NETWORKS; ELECTROMAGNETIC NOISE; NASA SPACE PROGRAMS
Other Descriptors: NAVIGATION SYSTEM; SMALL SPACECRAFT
Miscellaneous Notes: NASA Fact Sheet prepared for the 31st Annual AIAA/USU Conference on Small Satellites, Logan, UT
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Last Modified: November 17, 2017
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