Introduction of high precision antenna
In the field of GNSS, high-precision antenna is a kind of antenna which has special requirements on the stability of antenna phase center, and usually cooperates with high-precision board to realize centimeter-level or millimeter-level high-precision positioning. In the design of high-precision antenna, the following indexes of the antenna usually have special requirements: antenna beamwidth, low elevation gain, out-of-roundness, roll-off coefficient, front-to-back ratio, and anti-multipath capability, etc. These indexes will directly or indirectly affect the stability of the antenna phase center. These indicators will directly or indirectly affect the phase center stability of the antenna, which in turn affects the positioning accuracy.
1. High-precision antenna application and classification
High-precision GNSS antenna was initially mainly used in the field of surveying and mapping, which was used to realize static millimeter-level positioning accuracy in the process of engineering sampling, topographic mapping and various control measurements. With the increasing maturity of high-precision positioning technology, high-precision antennas are gradually applied in more and more fields, including continuous operation reference station, deformation monitoring, seismic monitoring, measurement and mapping, unmanned aerial vehicles, precision agriculture, automatic driving field, driving test and training, engineering machinery and other industrial fields, and there are obvious differences in the index requirements of antennas in different applications.
1.2 CORS system, deformation monitoring, seismic monitoring - reference station antenna
High-precision antenna is used in continuous operation reference station, through long-term observation to obtain accurate position information, and through the data communication system real-time observation data transmission to the control center, the control center solves the error correction parameters in the region and then through the ground-based enhancement system, wide-area enhancement system, star-based enhancement system, etc., will be sent to the error information to the mobile station (the user), and ultimately the user to get the accurate coordinate information. information.
In applications such as deformation monitoring and earthquake monitoring, it is necessary to accurately monitor the amount of deformation and detect small deformations in order to predict the occurrence of natural disasters and so on.
Therefore, in the design of high-precision antennas for applications such as continuous operation reference stations, deformation monitoring, and seismic monitoring, the first thing that must be considered is their excellent phase center stability and resistance to multipath interference, so that they can provide accurate position information in real time for various enhancement systems. In addition, in order to provide as many satellite correction parameters as possible, the antenna must receive as many satellites as possible, and the four-system full-band has become the standard configuration. In such applications, a reference station antenna (base station antenna) covering the full four-system band is usually used as the observation antenna of the system.
1.3 Measurement and Mapping - Built-in Measurement Antenna
In the field of surveying and mapping, it is necessary to design a built-in measurement antenna that is easy to integrate. The antenna is usually built into the top of the RTK receiver to realize real-time high-precision positioning in the field of surveying and mapping.
The main considerations in the design of the built-in measurement antenna are frequency band coverage, beam coverage, phase center stability, antenna size, etc. Especially with the popularization of network RTK applications, the all-network built-in measurement antenna that integrates 4G, Bluetooth, and WiFi is gradually occupying a major share of the market, and it has been favored by a large number of RTK receiver manufacturers since it was launched in 2016, and it has been widely used to promote its application .
1.4 Driving test and driving training, unmanned vehicle - external measurement antennae
Ltd. specializes in high-precision GNSS modules and wireless communication products, technology development and application promotion service providers, relying on the wireless communication technology in the field of R & D and promotion of experience, JUNODA set up a team with a wealth of experience in hardware and software development technology, aimed at domestic and foreign OEM / ODM customers and system integrators to provide high-quality, high-performance wireless modules and applications! We aim to provide high-quality, high-performance wireless modules and application programs to OEM/ODM customers and system integrators at home and abroad, and create long-term value for customers!
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In the field of wireless communication products, the company follows the latest development of international communication technology, introduces and acts as an agent for wireless communication modules that meet the market demand, and the products have a comprehensive layout from 2G, 3G, 4G, and are widely used in financial electronic payment, vehicle remote control, remote advertising information, repeater monitoring, mobile Internet terminals, smart home, remote medical care, network testing, enterprise information management, anti-theft alarm, Remote video transmission, intelligent meter reading, mobile computing, network navigation, voice phone, wireless gateway and other fields. Focused areas include video surveillance, network optimization, routers, POS and other M2M industry applications.
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