POSITION INFORMATION PROVIDING SYSTEM INDOOR TRANSMITTER AND METHOD FOR PROVIDING POSITION INFORMATION
First Claim
1. A position information providing system capable of providing position information by use of a first positioning signal which is a spread spectrum signal from each of a plurality of satellites, comprising an indoor transmitter, and a position information providing apparatus, wherein:
- the indoor transmitter includes a storage section which stores therein position data for identifying an installation location of the indoor transmitter, a generation section for generating an second positioning signal including the position data, as a spread spectrum signal, and a transmitting section for transmitting the generated spread spectrum signal; and
the position information providing apparatus includes a receiving section for receiving a spread spectrum signal, an identifying section for, based on a plurality of code patterns related to the first and second positioning signals, identifying one of the code patterns which corresponds to the spread spectrum signal received by the receiving section, a determining section for, based on a signal obtained by demodulating the received spread spectrum signal using the code pattern identified by the identifying section, determining which of the first and second positioning signals is received, a position information-deriving section for deriving position information of the position information providing apparatus, while switching between processing modes depending on a result of the determination, and an output section for outputting the position information derived by the position information-deriving section, andwherein the second positioning signal is configured to repeat a same content message in a cycle shorter than that of the first positioning signal.
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0 Petitions
Accused Products
Abstract
Provided is a position information providing system which can reduce a time required for acquiring position information. An indoor transmitter is adapted to provide position information by using a second positioning signal compatible with a first positioning signal which is a spread spectrum signal from each of a plurality of satellites. The indoor transmitter includes an EEPROM which stores therein position data for identifying an installation location thereof, an FPGA operable to generate a second positioning signal including the position data as a spread spectrum signal, and a transmitting section operable to transmit the spread spectrum signal. The second positioning signal is generated to repeat the same content in a cycle shorter than that of the first positioning signal.
31 Citations
20 Claims
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1. A position information providing system capable of providing position information by use of a first positioning signal which is a spread spectrum signal from each of a plurality of satellites, comprising an indoor transmitter, and a position information providing apparatus, wherein:
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the indoor transmitter includes a storage section which stores therein position data for identifying an installation location of the indoor transmitter, a generation section for generating an second positioning signal including the position data, as a spread spectrum signal, and a transmitting section for transmitting the generated spread spectrum signal; and the position information providing apparatus includes a receiving section for receiving a spread spectrum signal, an identifying section for, based on a plurality of code patterns related to the first and second positioning signals, identifying one of the code patterns which corresponds to the spread spectrum signal received by the receiving section, a determining section for, based on a signal obtained by demodulating the received spread spectrum signal using the code pattern identified by the identifying section, determining which of the first and second positioning signals is received, a position information-deriving section for deriving position information of the position information providing apparatus, while switching between processing modes depending on a result of the determination, and an output section for outputting the position information derived by the position information-deriving section, and wherein the second positioning signal is configured to repeat a same content message in a cycle shorter than that of the first positioning signal. - View Dependent Claims (2, 3, 4, 5, 6, 17)
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7. An indoor transmitter capable of providing position information by use of a first positioning signal which is a spread spectrum signal from each of a plurality of satellites, and a second positioning signal compatible with the first positioning signal, comprising:
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a first storage section which stores therein position data for identifying an installation location of the indoor transmitter; a generation section for generating an second positioning signal including the position data, as a spread spectrum signal; and a transmitting section for transmitting the generated spread spectrum signal, wherein the generation section is adapted to generate the second positioning signal in such a manner as to repeat a same content message in a cycle shorter than that of the first positioning signal. - View Dependent Claims (8, 9, 10, 11, 18, 19)
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12. A method of providing position information by use of a first positioning signal which is a spread spectrum signal from each of a plurality of satellites, comprising:
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the step of loading position data for identifying an installation location of an indoor transmitter; the step of generating an second positioning signal including the position data, as a spread spectrum signal; the step of transmitting the generated spread spectrum signal; the step of receiving the transmitted spread spectrum signal; the step of, based on a plurality of code patterns related to the first and second positioning signals, identifying one of the code patterns which corresponds to the received spread spectrum signal; the step of, based on a signal obtained by demodulating the received spread spectrum signal using the identified code pattern, determining which of the first and second positioning signals is received; the step of deriving position information, while switching between processing modes depending on a result of the determination; and the step of outputting the derived position information, wherein the second positioning signal is generated to repeat a same content message in a cycle shorter than that of the first positioning signal. - View Dependent Claims (13, 14, 15, 16, 20)
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Specification