The invention discloses a seamless indoor and outdoor
positioning system and positioning method based on combination a
chirp spread spectrum (CSS) with a GPS. The
positioning system is composed of an outdoor GPS
satellite module, an indoor CSS positioning module, an indoor and outdoor positioning fusion switching module and a positioning result display module. The outdoor
satellite positioning module utilizes a GPS
satellite for navigation. The indoor CSS positioning module carries out an indoor
distance measurement process by using a symmetrical double-sided two-way
ranging (SDS-TWR) method, carries out optimization
processing on positioning
ranging data by using Kalman filtering, and then obtains an indoor position of the indoor positioning module by using a geometric trilateral positioning
algorithm. The indoor and outdoor positioning fusion switching module carries out fusion, switching and integration on indoor and outdoor positioning methods based on indoor and outdoor positioning communication
signal strength, thereby realizing smooth indoor and outdoor positioning result transition; and the positioning result display module displays a positioning result based on an outdoor two-dimensional
electronic map and an indoor
planar graph. Compared with the existing
positioning system, the provided positioning
system enables seamless connection of precise indoor and outdoor positioning to be realized based on combination a CSS technology with a GPS
satellite navigation technology.