| 摘要 |
A positional information providing system capable of providing positional information without degrading accuracy, even in an indoor environment with significant influence of multipath fading, is provided. An information providing apparatus (100) receives, at a reception antenna RX-ANT1, positioning signals from an indoor transmitter (200) subjected to spread spectrum coding with different PRN codes and transmitted through transmission antennas TX-ANT1 and TX-ANT2, respectively. Positional information providing apparatus (100) searches for PRN codes of the transmission signals independently and asynchronously. If one PRN code is acquired, using the synchronization loop thereof, acquisition of the other PRN code of the other channel is tried. If acquisition succeeds in two channels, the signal of one channel is selected and positioning process is executed. |
