CR8894PXF+

The CR8894PXF+ by Calian is a high-performance, dual-band GNSS Controlled Reception Pattern Antenna (CRPA) engineered to ensure reliable positioning and timing in environments affected by interference or intentional jamming. Designed with a four-element architecture, it delivers advanced signal protection while maintaining full compatibility with standard commercial GNSS receivers.

Overview

The CR8894PXF+ supports simultaneous operation across both primary GNSS frequency bands:

• Lower band: 1189–1254 MHz
• Upper band: 1559–1591 MHz

It is capable of mitigating one or three interference sources per band (configurable), enabling the formation of up to six independent nulls across both frequency ranges. This allows the antenna to suppress multiple jamming signals while preserving the integrity of desired satellite signals.

Supported constellations and signals include:

• GPS (L1/L2, including M‑Code support)
• Galileo (E1/E5b)
• GLONASS (G2/G3)
• BeiDou (B1/B2b)

Key Applications

The CR8894PXF+ is ideal for mission‑critical environments where GNSS reliability is essential:

• Precision timing systems
• Navigation in contested or electromagnetic interference environments
• Critical infrastructure (e.g., airports, utilities)
• Law enforcement and public safety operations

Core Features

• Advanced interference mitigation:
  Configurable null steering with up to 20–40 dB null depth to suppress jamming sources

• Dual-band GNSS reception:
  Simultaneous operation across major navigation frequencies

• Integrated eXtended Filtering+ (XF+):

  • Greater than 80 dB out-of-band rejection (400 MHz to 3000 MHz)
  • Protection against interference from satellite communications systems such as Iridium and Inmarsat

• Adaptive signal protection:
  Independent amplification paths ensure continued operation even if one band is compromised

• Situational awareness via serial interface:

  • Real-time outputs (NMEA format)
  • Jamming detection and mitigation status
  • Interference frequency band
  • Estimated jammer direction

• Low power consumption:
  Approximately 150 mA at 5 V

• Rugged, waterproof design:
  IP69K-rated enclosure suitable for harsh marine and land environments

Technology Overview

The CR8894PXF+ integrates two complementary technologies to ensure robust GNSS performance:

• Controlled Reception Pattern Antenna (CRPA):
  Dynamically shapes the antenna radiation pattern to create “nulls” in the direction of interference sources, effectively blocking jamming signals.

• eXtended Filtering+ (XF+):
  Prevents front-end saturation by filtering unwanted signals before amplification and isolating upper and lower frequency processing paths.

Together, these technologies ensure that even in the presence of strong interference, the antenna continues to output a clean, standard RF signal compatible with commercial off-the-shelf (COTS) receivers.

Physical Design and Integration

The CR8894PXF+ is built using Tallysman Accutenna® technology, combining the antenna, interference detection, and mitigation systems into a compact, lightweight enclosure.

Key physical characteristics:

• Rugged IP69K housing for extreme environmental conditions
• Pole-mount design with standard thread inserts (5/8"-11 TPI or 1"-14 TPI)
• Sealed RF and data interfaces to prevent water ingress
• RF connectors: TNC or N-type
• Dual serial interfaces: RS232 and RS422

Benefits at a Glance

• Maintains GNSS functionality in high-interference environments
• Compatible with existing receiver infrastructure
• Enhances operational awareness with real-time jammer data
• Compact, lightweight, and easy to integrate
• Reliable performance across both marine and terrestrial deployments

The CR8894PXF+ provides a robust and efficient solution for maintaining GNSS signal integrity, making it particularly valuable in applications where continuous positioning and timing are critical despite challenging electromagnetic conditions.