One of the more interesting facets of GPS is that, at least from the receiver ... The first, a mixer board, receives the signal via an active antenna and converts it to a lower frequency.

Lofted beneath a weather balloon into the stratosphere, a radiosonde transmits a wealth of data back to the ground ... helical antenna used by the Vaisla R92 radiosonde’s GPS receiver, with ...

A soldier checks out an antenna on a Stryker vehicle outfitted with the Gen 1 Mounted Assured PNT System. (John Higgins/PEO IEW&S Public Affairs) The U.S. Army approved the full-rate production of ...

Additional protection comes with the ground-based DIGAR-100 anti-jam antenna, which provides superior immunity in the most severe GPS-challenged environments. Unlike existing Army MAPS solutions ...