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The car GPS navigation system: is a radio navigation positioning system based on 24 positioning satellites around the world, providing three-dimensional position, three-dimensional speed and other information around the world. It is composed of three parts, one is the ground control part, which is composed of the main control station, ground antenna, abuse station and communication auxiliary system. The second is the space part, which consists of 24 satellites distributed in 6 orbital planes. The third is the user device part, which is composed of a GPS receiver and a satellite antenna. The latest development trend of car navigation systems is to use Bluetooth (Bluetooth) wireless technology to receive signals transmitted by the car GPS. Antenna for GSM ,GSM Antenna ,GSM External Antenna ,GSM GPS Antenna ,GSM GPRS Anetnna

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