GPS antenna, GPS module, and then output data information through GPS module serial port.

GPS module is a module that can connect with computer or mobile phone by wireless Bluetooth or wired, and transmit the GPS signal it receives to the GPS software in computer or mobile phone for processing. We often call the GPS positioning module as the user part. It receives and demodulates the broadcast C / a code signal of the satellite like a "radio", with the frequency of 1575.42MHz. The GPS module does not broadcast signals and belongs to passive positioning.

GPS module

The key to the application of GPS module lies in the formulation of serial communication protocol, that is, the relevant input and output protocol format of the module. It mainly includes data types and information formats, including binary information and NMEA data information. These two kinds of information can communicate with GPS receiver through serial port.

The GPS module calculates the pseudo distance with each satellite and uses the distance intersection method to obtain the four parameters of the receiver, including longitude, latitude, altitude and time correction. It is characterized by fast point speed but large error. The initial positioning module requires at least four satellites to participate in the calculation, which is called 3D positioning. Three satellites can realize 2D positioning, but the accuracy is poor. The GPS module continuously outputs the positioning information and auxiliary information in NMEA format through the serial communication port for the receiver to choose and apply.

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