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.

Engineers often turn to VNAs to measure the return-loss characteristics of an antenna, but they must be used carefully ...

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 ...

The technology’s effectiveness in neutralizing ground-based threats positions it as a critical ... will inform updated Minimum Operational Performance Standards for GPS/GNSS antennas and cockpit ...