Engineering:Choke ring antenna
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;[2] since 1989 they have been improved and extended by many companies.[citation needed]
Due to its intricate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements.[citation needed]
Benefits
Choke ring antennas have excellent phase center stability, polarization purity, suppression of radiation below the horizon and multipath rejection.[3] 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.[4]
See also
- Trimble Inc. - one manufacturer of this product.
- Patch antenna - a DIRECTIONAL type of antenna.
- Magellan Navigation - another manufacturer of this product.
Notes
- ↑ "U.S. Patent 6,040,805 – Low Profile Ceramic Choke". http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=6040805.PN.&OS=PN/6040805&RS=PN/6040805. – Patent for a Low Profile Ceramic Choke, one specific type of choke ring antenna.
- ↑ Zhang, Li; Schwieger, Volker (26 January 2018). "Investigation of a L1-optimized choke ring ground plane for a low-cost GPS receiver-system". Journal of Applied Geodesy 12 (1): 55–64. doi:10.1515/jag-2017-0026. Bibcode: 2018JAGeo..12...55Z.
- ↑ Caizzone, Stefano; Schönfeldt, Miriam; Elmarissi, Wahid; Circiu, Mihaela-Simona (18 June 2021). "Antennas as Precise Sensors for GNSS Reference Stations and High-Performance PNT Applications on Earth and in Space". Sensors 21 (12): 4192. doi:10.3390/s21124192. PMID 34207276. Bibcode: 2021Senso..21.4192C.
- ↑ "Trimble GNSS Ti-V2 Choke Ring | GNSS Antennas". https://geospatial.trimble.com/en/products/hardware/trimble-choke-ring.
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