Patent ID: 7948437

Claim:
A positional information providing system capable of providing positional information using first positioning signals as spread spectrum signals from a plurality of satellites, comprising: an indoor transmitter, said indoor transmitter including a first storage unit storing positional data for specifying a location where said indoor transmitter is installed, a generating unit generating a second positioning signal having said positional data as a spread spectrum signal, and a transmitting unit transmitting said spread spectrum signal; and a positional information providing apparatus, said positional information providing apparatus including a receiving unit receiving the spread spectrum signal, a second storage unit storing code patterns related to said first and second positioning signals, a specifying unit specifying, based on the code pattern stored in said second storage, a code pattern corresponding to the spread spectrum signal received by said receiving unit, a determining unit determining which of said first and second positioning signals has been received, based on a signal obtained by demodulation using the code pattern specified by said specifying unit, a positional information calculating unit calculating positional information of said positional information providing apparatus by switching a process dependent on the result of said determination, and an output unit outputting the positional information derived by said positional information calculating unit; wherein said positional information calculating unit obtains said positional data from said signal obtained by demodulation, when said second positioning signal transmitted by said indoor transmitter is received, and calculates said positional information based on each of said plurality of spread spectrum signals when a plurality of said first positioning signals are received.