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A choke ring antenna is a type of omnidirectional antenna that is used for GNSS applications. Its design consists of a central antenna element, which is surrounded by several concentric conductive rings. These antennas are known for their ability to reject multipath signals (a reflection of satellite signals from nearby objects) from a source. This includes signals reflected from ground and water surfaces, buildings, topography, vegetation, and other sources. Choke ring antennas have specially designed filters, inserted in each groove, which reduces multipath signals in both the L1 and L2 bands within the same antenna configuration.
Since the path that a signal takes from a transmitter to a receiver can be used to measure the distance between the two, this makes it highly suitable for GPS applications in surveying and geological measurement (forestry applications). The reduction of multipath can greatly increase the accuracy of GPS recordings, especially in environments where signal attenuation is difficult. As a result, centimeter-level accuracy might theoretically be obtained when choke ring antennas are connected to mapping-grade GPS receivers.
Construction
Choke ring antennas are generally machined from a single billet of aluminum and consist of several concentric rings (3 to 5) of equal depth around a central ring that holds an antenna receiver. The choke rings are usually a quarter wavelength deep, in order to create a high impedance surface that prevents propagation of surface waves near the antenna and excitation of undesired modes. The net effect is a very smooth controlled pattern with low susceptibility to multipath. The entire choke ring is usually 300-450 mm in diameter and 60 mm in depth and weighs approximately 7 kg. These dimensions result in unhandy field measurement studies and thus limit its application in forestry. Choke rings function to eliminate the electromagnetic energy reflected from the Earth&#;s surface. The design of a choke ring is relatively standard, although some variations occur in the vertical arrangement of the rings, from flat to conical, the latter of which is used to assist in increasing signal quality from low elevations.
Due to the way this antenna is constructed, it is often enclosed in a protective cover when used for outdoor applications.
Limitations
An inherent disadvantage of the typical choke ring design is reduced antenna gain at low elevation angles (below 20°). The reduced antenna gain results in signal strength reduction followed by poor positional accuracy.
A choke ring antenna is an omnidirectional antenna designed for high frequencies (VHF & UHF). It consists of concentric conductive cylinders surrounding a central antenna. To protect it from the elements, the choke ring antenna is often enclosed in a radome or protective cover when installed outdoors.
The choke ring antenna is a high-performance GNSS antenna used for base stations, capable of tracking GPS, GLONASS, BeiDou, BeiDou Global, and Galileo systems. Its design meets the requirements for high precision and multi-system compatibility in measurement equipment. This antenna offers a stable phase center and high positioning accuracy for GPS applications. Additionally, the GNSS choke ring antenna includes specially designed filters that reduce multi-path signals in the L1 and L2 bands.
The choke ring antenna provides stable phase-center, offering accuracy at the millimeter level. Its choke ring structure effectively mitigates multipath interference and enables the tracking of low-elevation satellites. The antenna's radome is resistant to water, ice, snow, and dirt, allowing it to operate outdoors throughout the year.
Choke ring antennas are particularly notable for their ability to reject multipath signals, making them ideal for GPS and radar applications. In GPS ground-based receivers, choke ring antennas can provide precise measurements at the millimeter level, which is valuable for surveying and geological measurements.
Application
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The 3D choke ring antenna, equipped with multi-path suppression technology, effectively eliminates signal transmission errors. It also exhibits excellent anti-interference performance, suppressing unnecessary electromagnetic signals and preventing blockage from power grids, communication base stations, and radio stations. With its low elevation angle, high gain, good signal reception, and stable phase center, the choke ring antenna ensures sub-millimeter positioning accuracy. Currently, choke ring antennas are widely used in high-precision surveying and mapping, CORS stations, bridge and building deformation monitoring, and geological monitoring due to their sub-millimeter phase center stability.
Automated Monitoring Solutions for Geological Hazards
The automated monitoring solution for geological hazards leverages global satellite navigation satellite positioning (GNSS) technology, sensing technology, the Internet of Things, and cloud computing to provide real-time monitoring of deformation, stress and strain, disaster environment, mud level changes, rainfall, and other indicators. This integrated system collects, transmits, and displays data, offering a comprehensive monitoring solution that enables real-time collection, transmission, and warning of geological disaster monitoring indicators.
Solution for Safety Monitoring of Water Conservancy Dams
The water conservancy dam safety monitoring system utilizes real-time perception of various environmental, deformation, displacement, structure, stress, and seepage parameters to calculate and analyze the overall stability of the dam. It provides timely and accurate alarms for potential hazards, allowing long-term control and scientific data support for safety management. The system facilitates automatic collection, transmission, storage, analysis, and early warning of monitoring data, supporting additional functions such as modifying/deleting data, software window alarms, alarms, SMS alarms, and sound and light alarms.
Hydrological and Rainfall Monitoring Solution
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Water Quality Monitoring Solutions
Online water quality monitoring plays a crucial role in water environment management. By utilizing unmanned ships with water quality monitoring instruments, the online water quality monitoring system can promptly detect abnormal changes in
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Solution for Slope Safety Monitoring Along Highways
The highway slope safety monitoring solution incorporates global satellite navigation satellite positioning (GNSS) technology, sensing technology, the Internet of Things, cloud computing, and other advanced technologies to monitor real-time conditions such as deformation, stress-strain, disaster-prone environment, mud level changes, and rainfall along highway slopes. This comprehensive monitoring solution enables the collection, transmission, and warning of highway slope safety monitoring indicators in real time.
Mine Safety Monitoring Solution
Online safety monitoring of mining engineering involves conducting real-time and systematic scientific analysis of changes in slope engineering morphology based on slope engineering monitoring data. This analysis aims to predict, avoid, and reduce unsafe factors on slopes, providing reliable data and a scientific basis for the correct analysis, evaluation, prediction, and treatment of unstable slope areas.
Solutions for Structural Health Monitoring of Bridges
To enhance bridge safety and health, control bridge damage, and eliminate safety hazards, this solution integrates advanced monitoring technology for bridge safety monitoring. It provides a targeted structural health online monitoring system for bridges, considering their different types, structures, and geographical locations. The system enables real-time collection, transmission, and warning of bridge monitoring indicators.
Solution for Structural Health Monitoring of High-Rise Buildings
The Structural Health Monitoring solution for high-rise buildings is a highly integrated system that incorporates monitoring sensors, intelligent acquisition units, communication systems, power supply systems, and more. It can operate in harsh environments for extended periods, offering low power consumption, strong stability, and easy installation. By monitoring various data, the system transmits information to a data collection management and monitoring warning cloud platform. This platform performs data analysis, storage, query, analysis, display, statistics, warning, reporting, and other functions.
Contact MIDE for Your Choke Ring Antennas
In conclusion, choke ring antennas have a wide range of applications and benefits for various industries. Whether you are working in aviation, navigation, or telecommunications, understanding the capabilities of choke ring antennas is crucial for improving performance and efficiency. If you're interested in learning more about choke ring antennas or have any questions, feel free to contact us. Our team of experts is always happy to assist you with your antenna needs.
For more information, please visit Full frequency 3D Choke ring antenna.
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