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.

Antennas used with ground penetrating radar (GPR) come in different shapes and sizes. The largest antennas typically radiate the lower frequencies necessary to detect the deepest targets.

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 ...