Magellan Navigation choke ring antenna and protective radome

A tripod mounted choke ring antenna from Trimble Inc with no radome

A choke ring antenna is a particular form of omnidirectional antenna for use at high frequencies. It consists of a number of conductive concentric cylinders around a central antenna. Due to its delicate construction, it is often enclosed in a protective cover or radome when placed outside and exposed to the elements. Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... Magellan Navigation, Inc. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Trimble NASDAQ:TRMB is a provider of advanced positioning solutions, including GPS receivers. ... An omnidirectional antenna is an antenna system which radiates power uniformly in one plane with a directive pattern shape in a perpendicular plane. ... Radomes at the Misawa Security Operations Center, Misawa, Japan. ...

Choke ring antennas are notable for their ability to reject multipath signals from a source. Since the path that a signal takes from a transmitter to receiver can be used to measure the distance between the two, this makes it highly suited for GPS and radar applications. In a GPS ground based receiver, a choke ring antenna can provide millimeter precision measurements^[1] for surveying and geological measurement applications. PRIMERGY MultiPath PRIMERGY MultiPath supports redundant Fiber Channel paths, the configured connections between server and subsystem that are such an important component of disaster-tolerant servers and clusters. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... This long range radar antenna, known as ALTAIR, is used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on the Kwajalein atoll. ... Surveyor at work with a leveling instrument. ...

The choke ring design originated at the Jet Propulsion Laboratory^[2]. The NASA Jet Propulsion Laboratory (JPL), in Pasadena and La Cañada Flintridge, near Los Angeles, California, USA, builds and operates unmanned spacecraft for the National Aeronautics and Space Administration (NASA). ...

Notes

1. ^ http://www.trimble.com/l1l2chokering.shtml - Catalog page for a portable Trimble choke ring antenna.
2. ^ http://www.javad.com/index.html?/jns/technology/Single-Depth%20Low-Multipath%20Choke%20Ring.html - A basic description of choke ring antenna benefits and limitations.

External Links

• http://www.javad.com/index.html?/jns/technology/Choke%20Ring%20Theory.html - Basic choke Ring theory of operation.