Dual frequency (L1/L2) Choke Ring Antennas provide geodetic-quality GPS measurements for surveying, mapping, and research applications. Typical dual-frequency choke ring antennas maintain a stable phase center that has less than 1 mm of drift. The choke ring antenna is based on the geodetic research standard and features aluminum choke rings and a Dorne Margolin antenna element. These antennas are durable, have a low power consumption, and have excellent multipath rejection characteristics. Less-expensive but also high-precision options are now available as well. The UNAVCO Facility currently supports the following GPS antennas:

• Trimble GNSS Choke Ring
• Ashtech Choke Ring
• Trimble Zephyr Geodetic
• Topcon PG-A1

Related Links

• Antenna mounts
• Radomes (Antenna Covers)

Choke Ring Antenna Calibrations

• Choke-Ring Antenna Calibrations
• NGS Antenna Calibrations (IGS Designations)

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Last modified Tuesday, 03-Mar-2009 21:24:06 UTC

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