| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positional information supplying system that supplies positional information without allowing accuracy to drop even in an indoor environment with great multipath fading. <P>SOLUTION: A positional information supplying apparatus 100 receives with a reception antenna RX-ANT positioning signals transmitted from an indoor transmitter 200, spectral diffusion-encoded with different PRN codes and individually transmitted from transmission antennas TX-ANT1 and TX-ANT2. The positional information supplying apparatus 100 asynchronously searches the PRN codes of the transmitted signals independently of one another. When a first PRN code is successfully captured, the synchronous loop thereof is used to attempt capturing of another PRN code on another channel. If synchronous capturing on the two channels is successfully achieved, the signals on one channel are selected to process positioning. <P>COPYRIGHT: (C)2012,JPO&INPIT |
