Positional information providing system, positional information providing apparatus and transmitter
First Claim
1. 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 includinga 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, anda transmitting unit transmitting said spread spectrum signal; and
a positional information providing apparatus, said positional information providing apparatus includinga 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, andan output unit outputting the positional information derived by said positional information calculating unit;
whereinsaid 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, andcalculates said positional information based on each of said plurality of spread spectrum signals when a plurality of said first positioning signals are received.
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Accused Products
Abstract
Positional information is provided at a place out of reach of radio wave. The process executed by a positional information providing apparatus includes the steps of: obtaining a received positioning signal; specifying an emission source of the positioning signal; obtaining, when the emission source of the positioning signal is outdoors, a navigation message included in the positioning signal; executing a process for calculating the position based on the signal; obtaining, when the emission source of the positioning signal is indoors, message data from the positioning signal; obtaining coordinate values from the data; and displaying positional information based on the coordinate values.
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Citations
20 Claims
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1. A positional information providing system capable of providing positional information using first positioning signals as spread spectrum signals from a plurality of satellites, comprising:
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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;
whereinsaid 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A positional information providing apparatus for providing positional information, using first positioning signals as spread spectrum signals from a plurality of satellites and a second positioning signal emitted by an indoor transmitter installed at a location specified in advance and including positional data for specifying said location, comprising:
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a receiving unit receiving a spread spectrum signal; a storage unit storing code patterns related to said first and second positioning signals; a specifying unit for specifying a code pattern corresponding to the spread spectrum signal received by said receiving unit based on a code pattern stored in said storage; 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;
whereinsaid 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An indoor transmitter transmitting a signal of the same format as a first positioning signal emitted by a satellite transmitting a signal for positioning, comprising:
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a storage unit storing positional data for specifying a location where said indoor transmitter is installed; and a generating unit generating a second positioning signal having said positional data as a spread spectrum signal, said generating unit generating said second positioning signal as a spread spectrum signal having said positional data in place of a navigation message included in said first positioning signal and allowing specification of said location by the signal from a single said indoor transmitter; and a transmitting unit transmitting said spread spectrum signal. - View Dependent Claims (19, 20)
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Specification