Improved CDGPS FDIR Using Comm-based Relative Measurements

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX12CD30P
Agency Tracking Number: 114371
Amount: $124,925.00
Phase: Phase I
Program: SBIR
Awards Year: 2012
Solicitation Year: 2011
Solicitation Topic Code: S4.01
Solicitation Number: N/A
Small Business Information
MD, Greenbelt, MD, 20770-1405
DUNS: 101537046
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 Matthew Ruschmann
 Principal Investigator
 (301) 345-1535
 matthew.ruschmann@emergentspace.com
Business Contact
 Erin Bull
Title: Business Official
Phone: (301) 345-1535
Email: erin.bull@emergentspace.com
Research Institution
 Stub
Abstract
The proposed innovation is to use the comm-based measurements available from many advanced satellite cluster wireless networks to improve the flexibility and robustness of relative and absolute navigation systems without the additional expense, weight and power that a traditional navigation backup systems (like an extra GPS receiver) would require. This will be accomplished by comparing the range, range-rate or angle measurements predicted by GPS-based navigation solutions to the actual measurements obtained from the communication system. By monitoring these parity equations and the innovations of the GPS filters, FDIR can be significantly improved. These parity relations between redundant range measurements create a more sensitive residual than filter-based residuals because most filters naturally mask the faults. Recovery to GPS failure can be accomplished by relying on the comm measurements themselves to maintain relative state observability. Attempted recovery of GPS or other strategies can then be implemented without requiring the cluster to disperse. By building off of Carrier-phase Differential GPS (CDGPS) navigation filters and cluster flight simulations currently being built by Emergent under its DARPA System F6 contract, we will demonstrate the effectiveness of this FDIR technique in simulation.

* Information listed above is at the time of submission. *

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