GNSS Networks and Reference Stations
Leica AR25 – Next Generation Choke Ring Antenna
NRS Technical Training
September 3-5, 2008, Heerbrugg CH
AR25 - GNSS Choke Ring Antenna
Leica Geosystems is ready!
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
General Overview
Next generation GNSS choke ring antenna
ƒ Designed for infrastructure and reference station
installations where measurement quality is critical
ƒ High performance antenna in a new unique 3D design
ƒ Combines excellent multipath mitigation of 2D chokering design with improved low elevation tracking
ƒ Rugged design for long life time
ƒ Ideal for all Reference Networks, Scientific and Atmospheric Studies
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
Signal Overview
Multi-Constellation, Multi-Frequency Reception
ƒ “Future-proof” reception of all planned GNSS signals
ƒ GPS: L1, L2, L2C, L5
ƒ GLONASS: L1, L2, L3
ƒ Galileo: E2-L1-E1, E5a, E5b, E6, AltBOC
ƒ Compass (Beidou 2): E1, E2, E5b, E6
ƒ L-Band (inc. SBAS and OmniSTAR)
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
Design Characteristics
3D Choke Ring
ƒ Superior roll-off performance resulting in improved
low elevation tracking
ƒ Diameter identical to current JPL design to allow
potential reuse of existing protective radome
Slotted Choke Ring
ƒ Slotted rings reduce unwanted currents in choke ring
Advanced LNA Design
ƒ Excellent out-of-band rejection performance
ƒ Noise figure 0.5 - 1.2 dB
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
Design Characteristics
Antenna Element
ƒ New Dorne-Margolin Wideband Element
ƒ Excellent phase centre stability across all GNSS
frequencies
General
ƒ Antenna Gain (40 db)
ƒ N-Type Connector
ƒ Hemispherical radome as option
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
Low Elevation Tracking Performance
100% Observations: 6 degrees (3D Choke Ring)
versus 9 degrees (2D Choke Ring)
Observations at 1 degree: 50-55% (3D Choke Ring)
versus 20-24% (2D Choke Ring)
Statistics :3D Choke Ring v Antenna B
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NRS Technical Training – September 3-5, 2008
AR25 - GNSS Choke Ring Antenna
Technical Summary
ƒ New innovative high performance 3D design choke ring antenna
ƒ Compatible with most third party geodetic receivers
ƒ Antenna gain (40 db)
ƒ N Type antenna connector
ƒ Signals: ƒ GPS: L1, L2, L2C, L5
ƒ GLONASS: L1, L2, L3
ƒ Galileo: E2-L1-E1, E5a, E5b, E6, AltBOC
ƒ Compass (Beidou 2): B1, B2, B3
ƒ L-Band (inc. SBAS and OmniSTAR)
ƒ Future successor of AT504 GG
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NRS Technical Training – September 3-5, 2008