This section provides an overview for gnss modules as well as their applications and principles. Also, please take a look at the list of 10 gnss module manufacturers and their company rankings.
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A GNSS module is a module for acquiring positional data using signals from satellites. GNSS is the generic name for GPS, which is the most popular positioning system, GLONASS, which is a Russian satellite-based positioning system, and Galileo, which is an EU system. By using signals sent from various satellite systems, it is possible to measure positional information with higher precision.
GNSS modules are used to measure the position, speed, and direction of travel of a vehicle or to acquire location information for smartphone mapping functions, etc. When selecting GNSS modules, it is necessary to consider the size and cost of the module and the processing size of the signals received from the antenna. Other factors to be considered include shock strength against dropping for smartphones and tablet PCs, and heat and vibration strength for GNSS modules used in vehicles.
GNSS modules consist of a low-noise amplifier, and a GNSS receiver. The principle of operation is that weak signals emitted from satellites are received by the signal receiver and amplified by a low-noise amplifier. The amplified signal is processed by the GNSS receiver and position information is calculated. The position information is then transmitted to the device connected to the GNSS modules and used for applications that utilize the position information.
The following is an explanation of how GNSS calculates position information. The position and time information sent from multiple satellites is received by the signal receiver. The distance between the satellite and GNSS is determined from the time the signal is received, the time the signal is transmitted, and the speed at which the signal is traveling. On the other hand, the signals sent from satellites are so weak that they cannot be received if there are obstructions, and noise may be introduced due to the influence of the surrounding environment. Therefore, products that implement advanced signal processing to determine accurate position information are also on the market.
Although GNSS modules can provide high-quality position information by catching signals from satellites, errors can occur due to factors such as satellite orbit, satellite clock, ionospheric delay, tropospheric delay, receiver (antenna), and multipath. The reasons for errors caused by each factor are listed below.
Positioning methods of GNSS modules can be roughly classified into two types: single positioning and relative positioning.
In single (stand-alone) positioning, signals from four or more satellites are received by a single receiver (antenna) to perform positioning. Due to the clock error factor and other factors, the quality of single-satellite positioning is limited to 10m~20m.
Relative positioning performs simultaneous single positioning at the reference point for which accurate coordinates are required and at the point to be measured. Relative positioning uses information from multiple receivers (antennas) and this enables higher quality positioning than stand-alone positioning.
*Including some distributors, etc.
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Ranking as of March 2023 GloballyDerivation Method
Derivation MethodThe ranking is calculated based on the click share within the gnss module page as of March 2023. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.
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