GNSS Reference Station Antenna

Description

GNSS Reference Station Antenna — Full-Frequency Multi-System Choke Ring Antenna

BDS / GPS / GLONASS / Galileo / L-Band | Sub-Millimeter Phase Center | Choke Ring Multipath Suppression | IP67 | CORS & Geodetic Reference Station

The EV004 GNSS Reference Station Antenna is a high-precision, full-frequency, multi-system geodetic antenna engineered for the permanent infrastructure requirements of CORS networks, national reference station arrays, and professional survey base stations. With simultaneous coverage of BeiDou B1/B2/B3, GPS L1/L2/L5, GLONASS L1/L2/L3, Galileo E1/E5a/E5b/E6, and L-Band frequencies, the EV004 ensures complete signal availability across all current and next-generation GNSS constellations — future-proofing reference station infrastructure for decades of continuous operation.

The EV004’s defining performance characteristic is its phase center stability. Phase center error of ±1mm — traceable to sub-millimeter accuracy — provides the positional repeatability essential for geodetic-grade applications including earthquake early warning systems, long-term crustal movement monitoring, bridge deformation tracking, and precision differential correction broadcasting for RTK network users. The unique choke ring and choke plate structural design suppresses multipath signals from ground reflections and nearby structures, ensuring clean carrier phase measurements that directly translate to higher accuracy for connected GNSS receivers.

High gain at low elevation angles — with a maximum antenna gain of 6dBi and full 360° azimuth coverage — enables the EV004 to track satellites at low elevation angles that standard survey antennas reject, increasing the number of usable satellites, improving positioning geometry (DOP), and providing more robust signal availability in partially obstructed reference station sites. The integrated Low Noise Amplifier (LNA) delivers 40±2dB gain on both L1 and L2 bands with a noise figure of 1.5dB or less — ensuring signal integrity across all cable lengths and receiver input configurations typical of reference station installations.

Housed in a compact Φ213 × 155mm enclosure weighing 3kg or less, with a standard 5/8″×11 imperial surveying mount, TNC-K connector, and IP67 waterproof and dustproof rating, the EV004 is designed for permanent outdoor rooftop, pillar, and monument installation. Operating across -40°C to +85°C with 95% non-condensing storage humidity tolerance, the EV004 delivers continuous, unattended operation in coastal, tropical, arctic, and industrial reference station environments.

Key Applications

• CORS (Continuously Operating Reference Station) Networks
• Geodetic Survey Reference Stations
• Precise Point Positioning (PPP) Base Stations
• Earthquake & Seismic Monitoring Systems
• Bridge & Infrastructure Deformation Monitoring
• Automatic Dock & Port Operation Systems
• Global Navigation Satellite System Reference Infrastructure
• Long-Baseline RTK Network Nodes
• Crustal Movement & Geodynamic Monitoring
• Hydrographic Survey Reference

Key Features

Passive Antenna Characteristics

Low Noise Amplifier (LNA) Characteristics

Structural & Environmental Specifications

Frequency Coverage Summary

Technical Features — Detailed

Sub-Millimeter Phase Center Accuracy

The EV004 achieves phase center error of ±1mm with high stability and excellent measurement repeatability. Phase center stability is the single most critical performance parameter for reference station antennas — directly determining the accuracy and reliability of differential corrections broadcast to RTK network users, the precision of deformation monitoring measurements, and the long-term consistency of geodetic time-series data. The EV004’s sub-millimeter phase center performance meets the requirements of international geodetic standards for CORS network antennas.

Unique Choke Ring & Choke Plate Design

The EV004 incorporates a unique choke and choke plate structural design that provides excellent multipath suppression performance. Choke rings work by physically attenuating signals arriving from low elevation angles and below the antenna horizon — where ground-reflected multipath signals originate. By suppressing multipath at the antenna level before the signal reaches the receiver, the EV004 eliminates the primary source of positioning error in reference station environments, producing cleaner carrier phase observations and higher-quality differential corrections for all connected rover receivers.

High Gain at Low Elevation Angles

With a maximum gain of 6dBi and strong satellite tracking capability at low elevation angles, the EV004 tracks more satellites and maintains signal lock longer than standard GNSS survey antennas. Low-elevation satellite tracking improves positioning geometry (reduces DOP values), increases redundancy in challenging environments, and is particularly valuable for reference stations at high latitudes where GLONASS and GPS satellite elevations are frequently low.

Integrated Low Noise Amplifier

The onboard LNA provides 40±2dB gain on both L1 and L2 with a noise figure of 1.5dB or less — maintaining high signal-to-noise ratio across long coaxial cable runs typical in reference station installations. Operating from DC 3.3V to 12V at 50mA or less, the LNA is compatible with the bias-tee power supply circuits of all professional GNSS receivers.

IP67 Weatherproof Construction

Rated IP67 for complete dust exclusion and immersion resistance, the EV004 is designed for continuous unattended outdoor operation across -40°C to +85°C — covering the most extreme reference station deployment environments including arctic monitoring sites, coastal CORS stations exposed to salt spray, tropical survey networks, and industrial port automation installations.

Competitive Advantages

• Full-frequency coverage across all five major systems — BDS, GPS, GLONASS, Galileo, and L-Band — in one antenna
• ±1mm phase center error — sub-millimeter stability meeting international geodetic CORS antenna standards
• Unique choke ring and choke plate design — superior multipath suppression versus standard survey antennas
• 6dBi maximum gain with high performance at low elevation angles — more satellites tracked, better geometry
• 40dB LNA gain with ≤1.5dB noise figure — clean signal delivery across all cable lengths
• IP67 waterproof and dustproof — permanent outdoor installation without shelter or housing
• Standard 5/8″×11 imperial mount — universal compatibility with all geodetic tripods, pillars, and monuments
• TNC-K connector — industry-standard interface for all professional GNSS reference receivers
• -40°C to +85°C operating range — arctic to tropical deployment without performance degradation
• Galileo E6 frequency support — future-ready for Galileo High Accuracy Service (HAS) PPP corrections
• Compact Φ213mm diameter — smaller footprint than traditional choke ring antennas without sacrificing performance

Standards & Compatibility

• Connector: TNC-K — compatible with all professional GNSS reference station receivers
• Mounting: Standard 5/8″×11 imperial coarse thread (BSW) — universal geodetic tripod and monument compatibility
• Power: DC 3.3V to 12V bias-tee via coaxial cable — no separate power cable required
• Polarization: RHCP — standard for all GNSS satellite signals
• Compatible Receivers: All professional GNSS reference station receivers including Septentrio, Trimble, Leica, Javad, NovAtel, and others
• Installation Environments: Rooftop, geodetic pillar, concrete monument, survey tripod, port and dock structures

Disclaimer

Specifications subject to change without notice. All performance values are measured under standard laboratory and field conditions unless otherwise stated.