COLORADO SPRINGS — Lockheed Martin will begin anechoic tests this week of the GPS non-flight satellite testbed (GNST), an engineering, manufacturing and development pathfinder for the future GPS III constellation. The tests pave the way for follow-on thermal vacuum chamber evaluation of the GNST, which is at the halfway point in its development. The non-flying tes€?tbed, introduced by the U.S. Air Force specifically to avoid development issues and delays to follow-on operational ...

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