Double GPS positioning technology company, 4S shop for vehicles with GPS can test drive the vehicle status, location, street and nearby buildings which accurately monitor, and can do the following: 1. 2. Real-time monitoring of vehicles in real-time vehicle trajectory 4. The vehicle record track playback speed alarm exercise recordkeeping 5. statistical inquiry vehicle route planning 6. 7. 8. exceeds a predetermined line alarm mileage statistics The vehicle starts, the parking of vehicles parking location query 10. 11. Electronic Records 12. Set the speed curve fence statistical lists. Test drive the vehicle to achieve management gps positioning, while a test drive to ensure the safety of personnel. Our quality products and services can help you achieve: electronic fence, within the provisions of travel; set speed car gps positioning, speed alarm; real-time monitoring of vehicle car gps positioning system, accurate and timely dispatch; personnel driving the vehicle for a test drive to do the theoretical basis (vehicle performance); for vehicles and personnel security escort; works GPS positioning system GPS positioning system works collected by the ground control station and each station observations of meteorological information, calculate the satellite ephemeris table and satellite clock corrections gps locator, edit the format specified in the navigation message, inject this information to the GPS satellites on the ground by injecting station. When measuring position, the user can use to store ephemeris receiver to get a rough position of each satellite. Based on these data and their own position, by the computer to select the opening angle between the satellite and the user on-line as a large four satellites observing objects. When observed, the receiver uses code generator generates the satellite information correlating the received signal, and a frame count measurement pseudo distance between the user and the satellite navigation message in accordance with time stamp and the sub. The initial observations pseudo-corrected data and input from four satellites and listed three observation equation can be solved for the position of the receiver, and convert the desired coordinate system, in order to achieve the purpose of positioning. Car gps positioning system, gps positioning manufacturers (certified), Luoyang gps positioning provided by Electronic Technology Co., Ltd., Zhengzhou Double. Double Electronic Technology Co., Ltd., Zhengzhou (www.zzgprs.com) is a leader in Zhengzhou, GPS systems, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Double electronic leadership in the staff warmly welcome all inquiries negotiations to create a better future for Double electronics.