Pedestals

Nefraa Defence Antenna Positioners & Satellite Tracking Systems

Nefraa Defence’s antenna positioners are intelligently designed and ruggedly built to endure the most extreme environments. Our antenna positioners and satellite tracking systems deliver powerful, fast, and high-precision performance, making them ideal for Ka-, Ku-, X-, S-, and L-band tracking applications. These elevation-over-azimuth positioners, available in sizes ranging from 1.8 meters to 7.3 meters, offer unmatched accuracy, operational flexibility, and reliability.

Each antenna system includes standard equipment such as feed mounting poles, an antenna tracking controller unit, and a comprehensive maintenance tool kit. Standard options support AC or DC power and 100BASE-T Ethernet, with optional fiber connectivity available. Nefraa Defence also provides multiple reflector size options, with diameters from 1.5 meters to 7.3 meters, along with flexible single and multi-band RF configurations.

Our products are built to meet the stringent performance and accuracy demands of Low Earth Orbit (LEO) and Medium Earth Orbit (MEO) satellite tracking ground stations, Telemetry, Tracking & Control (TT&C), Earth Observation Satellite (EOS) systems, Direct Broadcast (DB), radar, Search and Rescue Satellite (SARSAT), Unmanned Aerial Vehicle/Remotely Piloted Vehicle Tracking (UAV/RPV), trailer-mounted tracking, and other custom applications.

The entire system is sealed and pressurized with dehydrated air or nitrogen gas to prevent corrosion of critical components such as the controller, electromechanical parts, and feed. This eliminates internal rust issues, such as failing brakes and weakened gears. Temperature and humidity sensors are monitored by the ACU, which automatically purges the system with fresh, dry air or nitrogen when needed. Even in the event of a pressurization failure, the antenna continues to operate reliably.

Key Features:

• Efficient Power Management: Uses servomotors and four-quadrant drives to minimize power consumption while delivering full torque at near-zero velocity.
• Optimized Tracking Performance: Elevation-over-azimuth fully counterbalanced systems draw minimal power while tracking, unless subjected to high wind loads.

Durability & Protection:

• Integrated mechanical components with IP65-rated brushless motors and internal brakes.
• Heavy-duty gears enclosed in a cast housing to protect lubricants from dust and moisture, ensuring maximum longevity.
• Automatic heating of gears and drives for reliable operation in temperatures as low as -40°C.

Advanced Satellite Tracking:

• Built-in precision GPS timing and location reference.
• High-speed azimuth axis enables reliable satellite tracking without keyhole effects.
• Positioners controlled via Ethernet or fiber, simplifying integration with control systems.
• Simple control interface allows TLE ephemeris storage for each satellite, enabling tracking by satellite name.

Standalone & Space-Saving Design:

• No indoor rack space required—controller is housed in an electrical cabinet at the positioner’s base.

Corrosion Resistance & Aesthetic Longevity:

• Structural components made from aluminum with stainless steel fasteners to eliminate rust.
• Powder-coated or hard-anodized exposed surfaces ensure long-lasting durability and appearance.

Click the links below to explore product sheets detailing Nefraa Defence’s antenna pedestal and positioner solutions.