GPS antenna technology greatly affects the excellence of receiver performance. There are four important parameters of GPS antennas: Gain, VSWR, Noisefigure, and Axialratio. Axialratio is an important indicator of the difference in signal gain in different directions. Since satellites are randomly distributed on the hemispherical sky, it is very important to ensure the sensitivity of the antenna in all directions. Antenna performance, appearance and structure, internal circuitry of the whole machine and axis ratio EMI and other effects.

And RTK high-precision positioning technology has a greater impact on antenna technology;

Our usual GPS due to the atmosphere, multipath signals, positioning accuracy GPS satellite clock difference, GPS satellite orbit difference and other interference resulting in low positioning accuracy;

Chinese name

RTK high-precision positioning antenna selection

Application Technology

Carrier phase difference technology

Applied to

Embedded high-precision positioning module development

RTK technology introduction

RTK (Real - time kine ** tic, real-time dynamic) carrier phase difference technology; RTK the technology is through the microwave transmitter real-time processing of two or more measurement station carrier phase observation of the difference, the reference station collected carrier phase sent to the user receiver to resolve the difference in coordinates. This is a new commonly used GPS measurement method, the previous static, fast static and dynamic measurements need to be resolved after the fact in order to obtain centimeter accuracy, while RTK it is a measurement method that can obtain centimeter-level positioning accuracy in the field in real time. The use of carrier phase dynamic real-time differential method of GPS application of major milestones, its emergence for engineering sampling, topographic mapping, a variety of control measurements has brought a new dawn, greatly improving the efficiency of field operations.

High-precision positioning (RTK) carrier phase difference technology is the most effective way to realize real-time high-precision positioning; and RTK antenna directly affects the speed and accuracy of high-precision positioning;

Conventional GPS antenna introduction

Conventional GPS antenna mainly has two kinds of built-in and external, general GPS positioning module recommended by the built-in ceramic antenna (passive) more applications, small size, can be integrated on the PCB board, low cost characteristics; this antenna needs to do a certain amount of matching, to consider the electromagnetic interference problem, the circuit design requirements are high; and in the application of high-precision positioning, but also need to consider the installation location, angle and gain (Gain ), standing wave (VSWR), noise factor (Noisefigure), axial ratio factor requirements;

RTK antenna selection

For RTK selection of high-precision positioning antenna, the general chip module original factory recommended matching external antenna, such as PuXuan IoT F20P recommended the use of sub-meter high-precision module RTK spiral rod antenna; COSCO RTK dual-frequency spiral antenna antenna for high-precision mapping instrument;

Rod external antenna is generally divided into 1/4 wavelength monopole antenna, half-wavelength bipolar antenna and spiral rod antenna three; rod antenna is a widely used horizontal omni-directional antenna, the shape of a vertical rod antenna, the length of the general 1/4 or 1/2 wavelength; in order to improve the effective height of the rod antenna, you can add some spokes on the top of the rod antenna leaf or in the rod antenna

PCB antenna design considerations:

1.RF avoid placing some scattered unshielded components near the module

2. Do not design FPC for a long time

3. RF laying ground isolation is mostly used for wiring, and circular arc is mostly used for wiring.

4. PCB edge hit the ground wall

5. Try to ground some metal components, while designing a good RF ground

6. RF wiring impedance should be controlled at 50 ohms, the wiring should be as short as possible

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!

The company mainly provides integrated antenna module, dual-frequency high-precision module, single-frequency high-precision module, thousand-seeking high-precision module, Zhongke micro-positioning module, U-BLOX positioning module, SICOM communication module, inertial navigation DR module, UWM GNSS module, RTK differential module, 4G communication module and high-precision antenna, etc., the products are sold well in Beijing, Shanghai, Shenzhen, Guangdong, Jiangsu, Zhejiang, Sichuan, Hunan and other parts of the country. Our GNSS modules are widely used in many application fields, such as drones, vehicle security monitoring and dispatching, automatic bus stop announcement, DVR, car DVD navigation, GPS electronic dog, synchronized timing, high-altitude balloon monitoring, engineering machinery, industrial automation, etc. In the field of wireless communication products, the company is closely involved in the field of wireless communication, such as RTK differential module, 4G communication module and high-precision antenna.

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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