CRPA Antenna (Controlled Reception Pattern Antenna)

CRPA antennas, or Controlled Reception Pattern Antennas, are advanced technologies designed to enhance the performance and reliability of defense systems. Utilizing multiple antenna elements, CRPA technology mitigates the effects of jamming and interference, ensuring robust and secure signal reception. Unlike Fixed Reception Pattern Antennas (FRPA), CRPA antennas dynamically adjust their reception patterns, making them essential for modern military applications where anti-jam capabilities are crucial. This innovation in antenna design significantly improves operational effectiveness in contested environments, providing a critical advantage in defense communications.
Overview CRPA Antenna (Controlled Reception Pattern Antenna)
By Mike Ball Last updated: August 27th, 2024

Controlled Reception Pattern Antennas

Controlled reception pattern antenna (CRPA) technology is used to protect GNSS receivers, especially those used in defense applications, against threats such as jamming, spoofing, and other forms of interference. CRPAs are a form of beam-steering antenna.

GNSS satellite signals, including GPS, Galileo, BeiDou, GLONASS, SBAS and QZSS, are typically very low power signals. This makes them vulnerable to jamming, spoofing, and interference. These threats can be used to affect the PNT (position, navigation and timing) capabilities of military platforms such as aircraft and helicopters, UAVs (unmanned aerial vehicles), missile systems, ground and armored vehicles, and naval vessels.

CRPA Systems

CRPA technology mitigates jamming and spoofing threats by taking advantage of the fact these signals and legitimate satellite signals arrive from different directions, and can thus be spatially filtered. The systems use an array of individually controllable antenna elements to set up a pattern of beams and nulls, steering the beams in the direction of GNSS satellite signals and the nulls in the direction of interference. The antenna pattern is highly adaptable and can be changed rapidly to account for attacks from varying directions.

CRPA systems include a processing unit that performs the necessary calculations to set up the antenna pattern and combat the interference while having minimal impact on the required GNSS signals. CRPAs can replace existing GNSS antennas without the need to modify the receiver.

CRPA Antennas testing

CRPA antenna systems testing by CAST Navigation

CRPA Antenna Testing

Jamming and spoofing threats to GPS and GNSS signals are constantly evolving, and so CRPA systems must undergo rigorous testing against the latest techniques.

CRPA testing can be performed in the field under real-world conditions, which is highly realistic but costly. GNSS simulators can also be used to test CRPA systems, and allow repeatable and thorough test programs to be carried out.

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