Henan Beidou satellite positioning Wholesale Product Features: Complies with the provisions of all the functions of the Ministry of Communications, set the GPS / Compass dual, recorder, scheduling screen, printer in one. Fitness vehicles: logistics vehicle, coach, coaches, school buses, buses, taxis, vehicles, dangerous goods, refrigerated trucks, escorted trucks, concrete trucks, trailers head, coal cars, car repair water power. Product features: real-time location, time tracking, area searching cars, track playback, parking location records, engine condition monitoring, long statistical stopping, driving long statistics, mileage statistics, working hours statistics handoff alarm, speed alarm, exception alarm, emergency alarm, power failure alarm, speed buzzer alarm, remote broken oil line, remote monitoring, alcohol testing, the temperature sensor 2-way, precise fuel control, reversing monitoring stations reported, camera function, LCD scheduling screen / LED advertising screen, traveling recorder function, driver identification and attendance, fatigue driving reminders, printing capabilities, remote parameter settings, automatic fault monitoring. The module supports: Communication part: GPRS or CDMA (default GPRS, optional CDMA) satellite component: GPS or Beidou (Compass National II / GPS compatible) function support: logistics vehicle real-time acquisition of oil (more than 95% accuracy) stir car reversing refrigerated trucks collect temperature acquisition process work scheduling screen advertising screen bus stations reported taxi dispatch screen advertising screen pictures Beidou satellite navigation system are: first central control system by simultaneously transmitting an interrogation signal to the satellite I and satellite II, broadcast to users in the service area by the satellite transponder. User response wherein the interrogation signal Beidou satellite vehicle positioning and simultaneously sends a response signal to the two satellites, the satellite transponder back to the central control system. Central control system receives and demodulates the signal sent to the user, and then apply the appropriate data processing services according to users. Positioning application, the central control system detected two time delay: the interrogation signal emitted from the central control system via a satellite transponder to reach the user, the user issues a position response signal via the same satellite transponder back to the central control system delays; and interrogation signal emanating from a central control, via the same satellite reaches the user, the user sends a response signal, the other satellite transponder back to the central control system extension Beidou satellite navigation system diagram late. Since the position of the central control system and the two satellites are known, the delay amount by the above two users can be calculated from the first satellite GPS Compass price, as well as the distance between the two satellites to the user and Beidou GPS system, so they know the user is in a first satellite center of the sphere is a sphere, and cross the line in order to focus on two satellites between ellipsoid. Another central control system in the computer search from digital terrain elevation map is stored in the user value, but also know that the user is in a certain reference ellipsoid parallel with the Earth's ellipsoid. Thus the central control system can calculate the 3D coordinates of the final user's point, the coordinates of the encrypted sent to the user by the outbound signal. Compass vehicle positioning, Compass GPS wholesale, Jiaozuo GPS Compass is 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.