Indoor and outdoor parallel navigation system applicable to intelligent mobile terminal

The invention relates to an indoor and outdoor parallel navigation system applicable to an intelligent mobile terminal. For the system, Beidou/GPS dual-mode positioning is adopted outdoors, and a positioning technique in which 2G/3G wireless signals are combined with indoor maps is adopted indoors. The two modes operate alternatively for omnibearing positioning without the disadvantage that a big Beidou/GPS can be blocked easily by buildings; the indoor and outdoor parallel navigation system has wide popularization and application values.