William
A. Sandrin, Senior Engineer
William Sandrin has some 35 years of experience in a
wide range of tasks related to communications satellite transmission engineering,
software modeling, and phased array antenna design. As a Senior Engineer at W.
L. Pritchard & Co., L.C., his responsibilities include satellite planning,
system analyses, communications performance, and intersystem coordination under
FCC and ITU procedures.
From
1971 to 2001, Mr. Sandrin worked at Comsat Laboratories (subsequently
incorporated into Lockheed Martin Global Telecommunications, LMGT), most
recently as Principal Scientist and previously as Manager of the Systems
Modeling and Analysis Department. He participated in satellite systems studies
and architecture definition; satellite transmission engineering; modulation and
multiple-access studies; spacecraft payload design; earth station design;
transmission impairments analyses; computer modeling and simulation; satellite
system ground and space segment contract monitoring; and ITU frequency
coordination.
Mr.
Sandrin has been involved in fixed satellite system studies for a number of commercial and military
systems, particularly the INTELSAT System. He has participated in aeronautical,
maritime, and land-mobile satellite system studies for the Inmarsat, ICO, AMSC,
Iridium, and other mobile satellite systems. He also has worked on fixed and
mobile Ka-Band satellite system studies, including those for the Astrolink
system. He was the architect for a number of transmission impairment software
programs which are extensively used by Intelsat and other organizations in
optimized transmission planning. He was principal designer of software to
geolocate interference by processing spacecraft telemetry.
He participated in the development of
adaptive phased array antennas for spacecraft and earth terminals. He has also
analyzed the intermodulation radiation that occurs in phased arrays with active
non-linear radiating elements, and the effects of non-linear amplifiers in
matrix transponder designs. He engaged in analysis, computer simulation, and
measurements of non-linear amplifier intermodulation noise, and has
participated in the development of linearization techniques.
Mr.
Sandrin has completed a number of propagation studies for fixed and mobile
satellite systems, including rain impairments, and shadowing and multipath
effects.
In
1966 Mr. Sandrin joined The Boeing Company, Aerospace Group, as a Research
Engineer. His work involved space communications system design, and the
development of a spacecraft multibeam adaptive phased-array antenna.
Mr.
Sandrin is a Senior Member of the Institute of Electrical and Electronics
Engineers (IEEE) and has authored or coauthored 23 peer-reviewed technical
papers.
Mr.
Sandrin has a B.S. degree in Electrical Engineering from the University of
Vermont, and a M.E.E. from Rensselaer Polytechnic Institute, and has pursued
graduate work at Seattle University and Johns Hopkins University.
W.L.
Pritchard & Co., L.C.
4405 East West Highway, Suite 501
Bethesda, MD 20814
Tel: 1.301.654.1144 • Fax: 1.301.654.1814
email: wlpritchard-co@verizon.net