VLBI Antenna Calibration via GPS

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX10CD70P
Agency Tracking Number: 094851
Amount: $99,763.00
Phase: Phase I
Program: SBIR
Awards Year: 2010
Solicitation Year: 2009
Solicitation Topic Code: S1.10
Solicitation Number: N/A
Small Business Information
NVI, Inc.
7257D Hanover Parkway, Greenbelt, MD, 20770-3612
DUNS: 541634518
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Daniel MacMillan
 Principal Investigator
 (301) 614-6118
 Daniel.MacMillan@nviinc.com
Business Contact
 John Gipson
Title: Business Official
Phone: (301) 614-6876
Email: John.Gipson@nviinc.com
Research Institution
N/A
Abstract
We propose to investigate and develop an inexpensive system to determine: 1)VLBI antenna properties such as axis-offset, non-intersection of axis and antenna reference point; 2) Gravitational and/or Thermal deformation; 3) The eccentricity vector from the VLBI antenna to nearby GPS receivers. The proposed system involves using several GPS receivers in close proximity driven by a common clock. Because of their proximity, atmosphere and ionosphere errors are common, and vanish when we take the difference of measurements from different receivers to a common a satellite. Satellite clock errors also vanish in this difference. Since the receivers use a common clock, receiver clock error also vanishes. The remaining error source is GPS multipath which can be mitigated.

* information listed above is at the time of submission.

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