Instructions for the operation of the built -in receiver of the car positioning terminal

　　At present, the car positioning terminal is generally 12 channels, and 12 satellites can be received at the same time. The car positioning terminal has a built -in GPS receiver to receive 3 satellites, which can output 2D data. Only latitude and longitude, no height. If you receive more than 4 satellites, you can output 3D data, which can provide altitude data.

　　However, due to the problem of the earth itself, the circle is not standard enough, so there will be some errors in high data. Nowadays, some vehicle positioning terminal GPS receivers also increase the pressure gauge, which can be comprehensively comprehensively altitude based on the obtained high data, which should be more accurate.

　　If the built -in GPS receiver at the vehicle positioning terminal is for the first time, or the last time the power distance is more than 500km, because the star calendar stored in the GPS receiver is not right, it is necessary to re -position the GPS receiver.

　　The built -in GPS receiver of the vehicle positioning terminal must be used in open and visible sky, so the room cannot be used normally. The accuracy of ordinary car positioning terminals is usually about 10 meters. The accuracy mainly depends on the receiving of satellite signals and the distribution of satellites that can receive signals in the air.

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