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  2. Controlled reception pattern antenna - Wikipedia

    en.wikipedia.org/wiki/Controlled_reception...

    Controlled reception pattern antennas (CRPA) are active antennas that are designed to resist radio jamming and spoofing. They are used in navigation applications to resist GPS spoofing attacks. [1] [2]

  3. Choke ring antenna - Wikipedia

    en.wikipedia.org/wiki/Choke_ring_antenna

    A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna. The first choke ring antennas were invented at JPL; [ 2 ] since 1989 they have been improved and extended by many companies.

  4. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    Used for elevated base station antennas for land mobile radio systems such as police, ambulance, and taxi dispatchers. Mast radiator A radio tower in which the tower structure itself serves as the antenna. Common form of transmitting antenna for AM radio stations and other MF and LF transmitters.

  5. GPS signals - Wikipedia

    en.wikipedia.org/wiki/GPS_signals

    A GPS receiver processes the GPS signals received on its antenna to determine position, velocity and/or timing. The signal at antenna is amplified, down converted to baseband or intermediate frequency, filtered (to remove frequencies outside the intended frequency range for the digital signal that would alias into it) and digitalized; these ...

  6. SINCGARS - Wikipedia

    en.wikipedia.org/wiki/SINCGARS

    Single Channel Ground and Airborne Radio System (SINCGARS) is a very high frequency combat network radio (CNR) used by U.S. and allied military forces. In the CNR network, the SINCGARS’ primary role is voice transmission between surface and airborne command and control (C2) assets.

  7. Direction finding - Wikipedia

    en.wikipedia.org/wiki/Direction_finding

    A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately ...