Short answer
An adaptive antenna array (typically 4, 7, 11, 16, or 32 elements) that electronically steers nulls toward jamming sources and / or steers beams toward GNSS satellites in real time. The standard anti-jamming hardware for military and high-value civilian GNSS receivers.
Interactive: adaptive null steering
Drag to move the jammer; the array re-steers its null automatically.
Null depth at jammer
-42.1 dB
The array applies element-wise weights that null the signal arriving from the jammer direction while preserving as much gain as possible elsewhere. With more elements the null gets deeper and narrower — a 4-element array typically delivers 25–40 dB of jamming rejection; a 32-element array can exceed 70 dB. The trade-off is size, weight, and cost — see the GNSource KGR product line for 4 / 7 / 11 / 16 / 32-element variants.
Detailed explanation
A CRPA is a phased-array antenna where each element's amplitude and phase are independently controlled by a digital signal processor. The DSP samples the received signal, identifies directions of high interference, and weights the element combination to produce a deep null toward the jammer — effectively steering the antenna's reception pattern to ignore the interfering direction.
Modern CRPAs typically use 4–7 elements for compact platforms, 7–11 for vehicle and naval applications, and 16–32 for fixed-site or large-platform deployments. Each added element gives roughly 3 dB more anti-jamming margin (J/S protection) — a 4-element array typically provides 25–40 dB of J/S; a 32-element array can exceed 70 dB.
Advanced CRPAs combine null-steering (away from jammers) with beam-forming (toward satellites), maximising signal-to-jammer-plus-noise ratio. Some include AI-based signal authentication that distinguishes genuine GNSS waveforms from sophisticated spoofing attacks — see anti-spoofing.
GNSource sells CRPA arrays from 4 to 32 elements covering BDS, GPS, and Galileo, designed for UAV, vehicle, missile, and fixed-site applications. The TDXL-KGR product line spans the full range — see the products page for element-count selection guidance.
Where you'll see this
Anti-Jamming CRPA
Browse product lineRelated terms
Anti-jamming
Techniques and equipment that maintain GNSS reception in the presence of deliberate or accidental RF interference. The main hardware approach is a CRPA (controlled reception pattern antenna); software approaches include narrow-band filtering, AGC compression detection, and pulse blanking.
Anti-spoofing
Detection and rejection of false GNSS signals — typically broadcast by an attacker who wants to misdirect a receiver to a false position or time. Distinct from anti-jamming; spoofing attacks use plausible-looking signals, not raw noise, so the receiver has to authenticate rather than just power through.
Polarization (RHCP / LHCP)
The rotation direction of the electric-field vector in a GNSS signal. All GNSS satellites broadcast right-hand circularly polarised (RHCP) signals. Ground reflections flip handedness to LHCP, so an antenna that rejects LHCP automatically rejects single-bounce multipath.
Phase center
The apparent electrical centre of an antenna — the point from which signal range is effectively measured by a GNSS receiver. Phase-centre stability (the variation in this point as the signal arrival angle changes) is the single most important parameter for survey-grade and geodetic antennas.