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 first storage unit which stores therein position data for identifying an installation location of the indoor transmitter, a generation unit for generating, as a spread spectrum signal, an second positioning signal which is a modulated signal having the position data, and a transmitting unit for transmitting the generated spread spectrum signal; and
the position information providing apparatus includes a receiving unit for receiving a spread spectrum signal, a second storage unit which stores therein a plurality of code patterns related to the first and second positioning signals, an identifying unit for identifying one of the code patterns which corresponds to the spread spectrum signal received by the receiving unit, a determining unit for, based on a signal obtained by demodulating the received spread spectrum signal using the code pattern identified by the identifying unit, determining which of the first and second positioning signals is received, a position information-deriving unit 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 unit for outputting the position information derived by the position information-deriving unit,and wherein;
the position data includes first data capable of identifying the indoor transmitter, and second data indicative of the installation location of the indoor transmitter; and
the generation unit is operable to generate, as the second positioning signal, a first phase signal having the first data after being subjected to modulation, and a second phase signal having the second data after being subjected to modulation;
whereina clock of the indoor transmitter is independent from a clock of each of the satellites, andthe position information-deriving unit is operable, (a) when the second positioning signal transmitted by the indoor transmitter which is one of a plurality of indoor transmitters, is received, to acquire the position data from the signal obtained by the demodulation, and, (b) when a plurality of the first positioning signals are received, to calculate the position information based on respective spread spectrum signals of the plurality of received first positioning signals,wherein the operations (a) and (b) above are switched independently by determining PRN-IDs of the first and second positioning signals.
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Accused Products
Abstract
An indoor transmitter is capable of programmably changing a format of a transmitter signal. A process to be performed by a position information providing apparatus comprises the step of acquiring a received positioning signal, and the step of identifying an emission source of the positioning signal, wherein, if the emission source of the positioning signal is an outdoor source, the process further comprises the step of acquiring a navigation message included in the positioning signal, and the step of performing a processing for calculating a position based on the signal, or, if the emission source of the positioning sign is an indoor source, the process further comprises the step of acquiring message data from the positioning signal, the step of acquiring coordinate values from the data, and the step of displaying position information based on the coordinate values.
17 Citations
19 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 first storage unit which stores therein position data for identifying an installation location of the indoor transmitter, a generation unit for generating, as a spread spectrum signal, an second positioning signal which is a modulated signal having the position data, and a transmitting unit for transmitting the generated spread spectrum signal; and the position information providing apparatus includes a receiving unit for receiving a spread spectrum signal, a second storage unit which stores therein a plurality of code patterns related to the first and second positioning signals, an identifying unit for identifying one of the code patterns which corresponds to the spread spectrum signal received by the receiving unit, a determining unit for, based on a signal obtained by demodulating the received spread spectrum signal using the code pattern identified by the identifying unit, determining which of the first and second positioning signals is received, a position information-deriving unit 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 unit for outputting the position information derived by the position information-deriving unit, and wherein; the position data includes first data capable of identifying the indoor transmitter, and second data indicative of the installation location of the indoor transmitter; and the generation unit is operable to generate, as the second positioning signal, a first phase signal having the first data after being subjected to modulation, and a second phase signal having the second data after being subjected to modulation;
whereina clock of the indoor transmitter is independent from a clock of each of the satellites, and the position information-deriving unit is operable, (a) when the second positioning signal transmitted by the indoor transmitter which is one of a plurality of indoor transmitters, is received, to acquire the position data from the signal obtained by the demodulation, and, (b) when a plurality of the first positioning signals are received, to calculate the position information based on respective spread spectrum signals of the plurality of received first positioning signals, wherein the operations (a) and (b) above are switched independently by determining PRN-IDs of the first and second positioning signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An indoor transmitter capable of providing position information using a first positioning signal which is a spread spectrum signal from each of a plurality of satellites, comprising:
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a first storage unit which stores therein position data for identifying an installation location of the indoor transmitter; a generation unit for generating, as a spread spectrum signal, an second positioning signal which is a modulated signal having the position data; and a transmitting unit for transmitting the generated spread spectrum signal, wherein; the position data includes first data capable of identifying the indoor transmitter, and second data indicative of the installation location of the indoor transmitter; and the generation unit is operable to generate, as the second positioning signal, a first phase signal having the first data after being subjected to modulation, and a second phase signal having the second data after being subjected to modulation; wherein a clock of the indoor transmitter is independent from a clock of each of the satellites. - View Dependent Claims (16, 17, 18)
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19. 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 generating an second positioning signal which is modulated, as a spread spectrum signal, based on position data for identifying an installation location of an indoor transmitter; the step of transmitting the generated spread spectrum signal; the step of receiving a spread spectrum signal; the step of identifying, based on a plurality of code patterns related to the first and second positioning signals, one of the code patterns which corresponds to the received spread spectrum signal; the step of determining, based on a signal obtained by demodulating the received spread spectrum signal using the identified code pattern, 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 position data includes first data capable of identifying the indoor transmitter, and second data indicative of the installation location of the indoor transmitter; the step of generating includes the sub-step of generating, as the second positioning signal, a first phase signal having the first data after being subjected to modulation, and a second phase signal having the second data after being subjected to modulation; and a clock of the indoor transmitter is independent from a clock of each of the satellites.
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Specification