choke ring antenna
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{{stack|File:DGPS Reference Station.jpg Reference Station]]}}
A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna.
The first choke ring antennas were invented at JPL;{{cite journal |last1=Zhang |first1=Li |last2=Schwieger |first2=Volker |title=Investigation of a L1-optimized choke ring ground plane for a low-cost GPS receiver-system |journal=Journal of Applied Geodesy |date=26 January 2018 |volume=12 |issue=1 |pages=55–64 |doi=10.1515/jag-2017-0026 |bibcode=2018JAGeo..12...55Z |s2cid=126123321 }} since 1989 they have been improved and extended by many companies.{{fact|date=January 2024}}
Due to its intricate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements.{{fact|date=January 2024}}
Benefits
Choke ring antennas have excellent phase center stability, polarization purity, suppression of radiation below the horizon and multipath rejection.{{cite journal |last1=Caizzone |first1=Stefano |last2=Schönfeldt |first2=Miriam |last3=Elmarissi |first3=Wahid |last4=Circiu |first4=Mihaela-Simona |title=Antennas as Precise Sensors for GNSS Reference Stations and High-Performance PNT Applications on Earth and in Space |journal=Sensors |date=18 June 2021 |volume=21 |issue=12 |pages=4192 |doi=10.3390/s21124192 |doi-access=free |pmid=34207276 |pmc=8234969 |bibcode=2021Senso..21.4192C }} This makes them highly suited for satellite navigation. In a GNSS ground-based receiver, a choke ring antenna can provide millimeter precision measurements for use in surveying and geological measurements.{{cite web | url=https://geospatial.trimble.com/en/products/hardware/trimble-choke-ring | title=Trimble GNSS Ti-V2 Choke Ring | GNSS Antennas }}
See also
- Trimble Inc. - one manufacturer of this product.
- Patch antenna - a DIRECTIONAL type of antenna.
- Magellan Navigation - another manufacturer of this product.
Notes
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{{Antenna Types}}
Category:Radio frequency antenna types
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