北斗星通资料（Information of beadstar）.docVIP

北斗星通资料（Information of beadstar） What are the three functions of the beidou satellite navigation system? Rapid positioning: the beidou navigation system can provide all-weather, high-precision and fast real-time positioning service for users in the service area. Brief communication: beidou system user terminal has two-way digital message communication capability, which can transmit more than 100 Chinese characters at once. Precision timing: the beidou navigation system has one-way and two-way insemination functions. According to different precision requirements, the time and frequency synchronization between the beidou navigation system can be achieved by using the timing terminal, which can provide the time synchronization accuracy of tens of nanoseconds. How to locate the two stars of beidou satellite navigation system? The beidou system is based on two geostationary satellites (GEO) for the users two-way ranging, and the location of a ground central station equipped with an electronic elevation map is calculated. The location is sent to the central station by the user terminal, and the central station will locate the location information and send the location information to the user. Its positioning on the basis of the principle of three ball intersection, namely, centered on 2 satellite known coordinates of each to determine the star to the user machine distance for the radius, the formation of two spherical, u