Choke ring antenna

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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 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

In modern geodetic research and satellite navigation systems, such as GPS, the accuracy and reliability of the data received play a crucial role. One of the key components that ensures high accuracy and minimizes the influence of external factors is the "Choke Ring" antenna. These antennas have gained popularity due to their unique characteristics, making them indispensable in various fields, from geodesy to scientific research.

The "Choke Ring" antenna type has several key advantages, especially in the fields of geodesy and satellite navigation systems like GPS:

1. Multipath Suppression: The main feature of the Choke Ring antenna is its ability to reduce multipath effects. This is achieved through the ring elements that surround the main part of the antenna. These rings block signals that are reflected off the ground or other surfaces, allowing the antenna to receive a clearer and more accurate signal.

2. High Accuracy: Due to the reduction of multipath effects, Choke Ring antennas provide high accuracy in location determination. This makes them ideal for use in geodesy, mapping, and any applications requiring high precision GPS navigation.

3. Reliability in Various Conditions: Choke Ring antennas perform well in various conditions, including complex urban and natural landscapes. They are less affected by the environment, which improves the stability and reliability of the signal.

4. Application in Scientific Research: These antennas are often used in scientific research, such as space geodesy and monitoring of the Earth's crust, where particular precision in measurements is required.

Because of these advantages, Choke Ring antennas are considered one of the best choices for tasks where precision and reliability of satellite signal reception are critically important.

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