Satellite Navigation and Positioning Technology GNSS The most commonly used consumer GNSS location-based devices, cell phones and tablets are widely used. In addition, there are a number of other factors, including the widespread use of in-car navigation. Examples include tracking fleet cars for real-time logistics information, using personal tracking apps to monitor workers, and ensuring the safety of the elderly.

Consumer electronic devices through built-in GPS digital cameras and sports watches, pet tracking devices and services, and location-based tracking application promotion.

GNSS chips are widely used

GNSS chips are developing in the direction of multimodalization

It is due to the rapid growth of the GNSS market, the traditional WLAN cell phone chip manufacturers are also actively carrying out research and development of GNSS chips and modules, GPS / GNSS chip market is rapidly entering the new market.

GNSS chip to the direction of multi-mode development, that is, a single chip to support a variety of chips GNSS system, such as GPS GLONASS, GPS Galileo, GPS Beidou, etc. GNSS it is also used in high-precision areas, mainly used in surveying and mapping, aircraft, aerospace and defense, unmanned aerial vehicles or missiles in the guidance system and other industries.GNSS equipment and applications.

High precision GNSS baseband chip

GNSS System Description

GNSS system is divided into three main sections.

1.The space segment consists of satellites or spacecraft (SV) used to transmit navigation messages containing satellite orbit, position and transmission time.

2.The control segment is the ground monitoring station and master control center that tracks satellite signals, collects pseudo-distance measurements and atmospheric model data, provides navigation information updates, atmospheric and correction information, and satellite control.

3. The user segment is the GNSS receiver.

Working principle of GNSS receiver

Trilateral measurement method

A GNSS receiver calculates its position by trilateration.

It uses the transmission time and position data in the navigation text to measure the delay of the satellite signals to calculate the distance between the receiver and the satellite (pseudo-distance).

First, all possible positions of a GNSS receiver at a specific distance (pseudo-distance) from the satellite form a sphere. The intersection of two spheres is a circle. The intersection of three spheres is two points.

Finally, a fourth piece of data is needed to determine the correct location of the receiver. The fourth piece of data can be the surface of the Earth, meaning that if the receiver is located on the surface of the Earth, the point on the surface of the Earth is the correct location of the receiver. For more common solutions, the pseudo-distance of the fourth satellite is needed to locate it.

Also, by measuring the four satellites, not only is it possible to determine the receiver's positional information, i.e., longitude, latitude, and altitude, but it is also possible to correct the receiver's clock error and determine the correct time.

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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