Talking about the antenna of the GPS module of the drone
GPS is the terminal that locates or navigates by receiving satellite signals. The antenna must be used to receive signals.GPS satellite signals are divided into L1 and L2, the frequency of 1575.42MHZ and 1228MHZ, of which L1 for open civil signals, the signal is circularly polarized. Signal strength is -166dBW around the signal is weaker. These characteristics determine why GPS receive signal prepare special antenna.GPS antenna plays an important role in agriculture, aviation, environment, marine transportation, public safety and disaster relief, railroad, space, survey and mapping and other fields.
Receiving antenna is the first device of GPS receiver to process the satellite signals and convert the received electromagnetic wave signals emitted by GPS satellites into voltage or current signals to process the RF front end of the receiver. The satellite's antenna has a certain directional function, i.e., the signal power originally emitted in all directions is concentrated on the earth, also known as gain. The larger the antenna, the higher the gain.
First, the classification of GPS antenna according to the Swiss u-blox CEO Thomas Seiler global has more than 20 kinds of research. gps antenna; Mr. Thomas Seiler in the field of GPS antenna has been researching for more than 20 years, but suggests that according to the volume, sensitivity, price, and other comprehensive performance to use a wide range of standard ceramic antenna. gps receiver antenna has different structure types, such as monopole, dipole, spiral, microstrip, choke coil and so on.
1, in the polarization mode GPS module antenna is divided into vertical polarization and circular polarization. In terms of existing technology, circular polarization has better performance. Therefore, except for special cases, GPS circular polarization will be used for module antenna!
2, from the installation method GPS module antenna is divided into built-in antenna and external antenna. GPS Therefore, the module is gradually miniaturized, integrated GPS built-in installation and placement Mainly used for module antenna. At this time, the antenna must be above all metal devices, the shell must be plated and well grounded, away from EMI for example, interference sources CPU, SDRAM, SD card, crystal oscillator, DC/DC.
3, from the power supply, GPS module antenna built-in antenna is divided into active antenna and passive antenna.
Passive antenna does not contain a low noise amplifier or power supply, but due to the unamplified GPS signal strength is weak, the cable length from the passive antenna to the receiver is generally not more than 1 m. As shown in the figure is the passive antenna of the GPS integrated module and antenna:
(1) silver layer: the silver layer on the surface of the ceramic antenna will affect the resonance frequency of the antenna, the ideal frequency is 1574.42MHZ, in the time of production, you can adjust the silver surface shape and frequency. (2) Ceramic sheet: the quality of ceramic powder and sintering process directly affects its performance, the larger the area, the higher the resonance frequency. Active antenna: generally powered by the ceramic antenna, LNA (low noise signal module), cable, connector composition, plus a sealed waterproof ring, also known as the G-mouse.
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 research and development 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 scheduling, 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, our company is closely involved in the development and production of wireless communication products, such as RTK differential modules, 4G communication modules and high-precision antennas.
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