JP2010034836A - Position information providing system, position information providing apparatus, and indoor transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide position information and additional information related to it. <P>SOLUTION: A position information providing apparatus 100-1 is provided with a radio transmission/reception LSI 704, a base band/protocol processing LSI 706, an LSI 714 for one-segment radio reception, a one-segment OFDM demodulation LSI 716, an LSI 718 for one-segment video decoding, a GPS reception LSI 724, a CPU 730, and a memory 740. The CPU 730 includes an application part 732 for one-segment reception, a GPS application part 734, an IMES reception part 736, and a one-segment channel number extraction part 738 for extracting a one-segment channel number. The CPU 730 performs automatic tuning based on the one-segment channel number. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for providing position information and additional information related thereto. More specifically, the present invention relates to a technique for providing position information and additional information related thereto even in an environment where a signal transmitted from a satellite that transmits a positioning signal does not reach.

  A GPS (Global Positioning System) is known as a conventional positioning system. A satellite for transmitting a signal used for GPS (hereinafter referred to as “GPS signal”) (hereinafter referred to as a GPS satellite) is flying at an altitude of about 20,000 km from the ground. The user can measure the distance between the GPS satellite and the user by receiving and demodulating the signal transmitted from the GPS satellite. Therefore, when there is no obstacle between the ground and the GPS satellite, positioning using a signal transmitted from the GPS satellite is possible. However, for example, when using GPS in an urban area, a building that stands in the forest becomes an obstacle, and the user's location information providing device often cannot receive signals transmitted from GPS satellites. Further, due to the diffraction or reflection of the signal by the building, an error occurs in the distance measurement using the signal, and as a result, the positioning accuracy often deteriorates.

  In addition, there is a technique for receiving a weak GPS signal penetrating through a wall or a roof in a room, but the reception situation is unstable, and the positioning accuracy is lowered.

The positioning has been described above by taking the GPS as an example, but the phenomenon described above is generally applicable to a positioning system using a satellite. The satellite positioning system is not limited to the GPS, and includes, for example, a system such as GLONASS (GLOobal NAvigation Satellite System) in Russia and Galileo in Europe. A technique relating to provision of position information is disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-67086 (Patent Document 1).
JP 2006-67086 A

  However, according to the technique disclosed in Japanese Patent Application Laid-Open No. 2006-67086, the reader or writer is unique to a system that provides position information, and there is a problem that it is versatile. In order to avoid interference, it is necessary to suppress transmission output, the range in which position information can be received is limited, continuous position information cannot be acquired, and a large number of transmitters are required to cover a wide range. There was a problem that it was necessary.

  In addition, regarding the acquisition or notification of position information, for example, since the installation location is known in advance in the case of a fixed telephone, the transmission location can be specified by a telephone transmitted from the fixed telephone. However, since mobile communication has become common with the spread of mobile phones, there are increasing cases in which location information of a caller cannot be notified like a fixed phone. On the other hand, regarding emergency reports, legislation has been developed to include location information in reports from mobile phones.

  In the case of a mobile phone having a conventional positioning function, the position information is acquired at a place where a signal from a satellite can be received, and thus the position of the mobile phone can be notified. However, there is a problem that position information cannot be obtained by a conventional positioning technique in a place where radio waves cannot be received such as indoors and underground shopping streets.

  On the other hand, with the widespread use of one-segment broadcasting, terminals that have a function for receiving terminals having a positioning function to receive one-segment broadcasting have also been developed. However, when receiving one-segment broadcasting, it is necessary to select the channel, but in order to receive broadcasts from many one-segment broadcasting stations with small signal outputs, the channel selection operation becomes complicated. In some cases, 1Seg broadcasting may not be viewed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a position information providing system that facilitates channel selection of digital broadcasting that broadcasts additional information related to position information. Is to provide. Another object is to provide a position information providing system that can provide position information and additional information related thereto even in an environment where a positioning signal from a satellite cannot be received.

  An object of another aspect of the present invention is to provide a position information providing apparatus that facilitates channel selection of digital broadcasting for broadcasting additional information related to position information. Another object is to provide a position information providing apparatus capable of providing position information and additional information related thereto even in an environment where a positioning signal from a satellite cannot be received.

  Still another object of the present invention is to provide an indoor transmitter that facilitates channel selection of digital broadcasting that broadcasts additional information related to position information. Another object is to provide an indoor transmitter that can provide position information and additional information related thereto even in an environment where a positioning signal from a satellite cannot be received.

  According to an aspect of the present invention, a position information providing system capable of providing position information using a first positioning signal that is a spread spectrum signal from a plurality of satellites is provided. This system comprises an indoor transmitter. The indoor transmitter has first storage means for storing position data for specifying a place where the indoor transmitter is installed, channel number information of a digital broadcast wave, and first data having position data and channel number information. And generating means for generating the two positioning signals as the spread spectrum signal and transmitting means for transmitting the spread spectrum signal. The position information providing system further includes a position information providing device. The position information providing apparatus is obtained by a broadcast signal receiving unit that receives a digital broadcast wave, a positioning signal receiving unit that receives a spread spectrum signal, an acquisition unit that acquires channel number information from the spread spectrum signal, and an acquisition unit. Channel selection control means for controlling the channel selection by the broadcast signal receiving means based on the channel number information, and output means for outputting information based on the digital broadcast wave of the channel selected by the channel selection control means.

  Preferably, the acquisition means stores a first code pattern for the first positioning signal and a second code pattern for the second positioning signal that is different from the first code pattern. Second storage means, and extraction means for extracting channel number information from the second positioning signal based on the second code pattern.

  Preferably, the acquiring means performs processing for specifying a code pattern corresponding to the spread spectrum signal received by the positioning signal receiving means based on the first and second code patterns until the specified result is obtained. And a specifying means for performing the second positioning signal.

  Preferably, the position information providing apparatus further includes a setting storage unit that stores a setting that defines a channel selection mode of the broadcast signal receiving unit. The channel selection control means switches the channel selection by the broadcast signal receiving means according to the contents of the setting.

  Preferably, the setting is effective based on the channel number information acquired from the second positioning signal and the channel number information acquired from the second positioning signal. Including invalid settings.

  Preferably, the first storage means further stores the importance of the channel number information. The generating means generates a second positioning signal further having importance as a spread spectrum signal. The channel selection control unit of the position information providing device controls the channel selection of the broadcast signal receiving unit according to the importance.

  Preferably, when the importance level exceeds a preset importance level, the channel selection control unit selects a channel based on the acquired channel number information.

  Preferably, the indoor transmitter further includes digital broadcast means for transmitting a digital broadcast wave on a channel specified by the channel number information.

  According to another aspect of the present invention, position information is provided based on a first positioning signal that is a spread spectrum signal from a plurality of satellites and a second positioning signal that is a spread spectrum signal from a transmitter. A position information providing apparatus capable of performing the above is provided. The format of the first positioning signal is the same as the format of the second positioning signal. The position information providing device includes broadcast signal receiving means for receiving digital broadcast waves, and positioning signal receiving means for receiving the first or second positioning signal. The second positioning signal has position data for specifying the location where the transmitter is installed and channel number information of digital broadcast waves. The position information providing device includes an acquisition unit that acquires channel number information from the second positioning signal, a channel selection control unit that controls channel selection by the broadcast signal reception unit based on the channel number information acquired by the acquisition unit, Output means for outputting information based on the digital broadcast wave of the channel selected by the channel selection control means.

  Preferably, the acquisition means stores a first code pattern for the first positioning signal and a second code pattern for the second positioning signal that is different from the first code pattern. And storage means for extracting channel number information from the second positioning signal based on the second code pattern.

  Preferably, the obtaining unit performs processing for identifying a code pattern corresponding to the spread spectrum signal received by the positioning signal receiving unit based on the first and second code patterns until the identification result is obtained. And a specifying means for performing the second positioning signal.

  Preferably, the position information providing apparatus further includes a setting storage unit that stores a setting that defines a channel selection mode of the broadcast signal receiving unit. The channel selection control means switches the channel selection by the broadcast signal receiving means according to the contents of the setting.

  Preferably, the setting is effective based on the channel number information acquired from the second positioning signal and the channel number information acquired from the second positioning signal. Including invalid settings.

  Preferably, the second positioning signal includes importance of channel number information. The channel selection control unit controls the channel selection of the broadcast signal reception unit according to the importance.

  Preferably, when the importance level exceeds a preset importance level, the channel selection control unit causes the broadcast signal reception unit to perform channel selection based on the acquired channel number information.

  According to yet another aspect of the invention, an indoor transmitter is provided. The indoor transmitter includes a storage means for storing position data for specifying a place where the indoor transmitter is installed, channel number information of a digital broadcast wave, and a message signal having position data and channel number information. Is generated as a signal spread spectrum signal, and a transmission means for transmitting the spread spectrum signal.

  Preferably, the generation unit generates the message signal in the same format as the positioning signal transmitted from the positioning satellite.

Preferably, the code pattern of the positioning signal is different from the code pattern of the message signal.
Preferably, the message signal includes control data for forcing channel selection based on the channel number information to the message signal receiving apparatus.

  Preferably, the indoor transmitter further includes digital broadcast means for transmitting a digital broadcast wave on a channel specified by the channel number information.

  According to an aspect of the present invention, it is possible to easily select a digital broadcast that broadcasts additional information related to position information. According to another aspect of the present invention, position information and additional information related thereto can be provided even in an environment where a positioning signal from a satellite cannot be received.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  A position information providing system 10 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of the configuration of the position information providing system 10. The position information providing system 10 flies at an altitude of about 20,000 meters above the ground and transmits GPS positioning signals (hereinafter referred to as “positioning signals”) satellites 110, 111, 112, 113, position information providing devices 100-1, 100-2 that function as devices that provide position information, and indoor transmitters 200-1, 200-2, 200-3, 200-4. The location information providing devices 100-1 and 100-2 are collectively referred to as the location information providing device 100. The position information providing apparatus 100 is a terminal having a conventional positioning function, such as a mobile phone, a car navigation system, and other mobile body positioning apparatuses.

  Here, the positioning signal is a spectrum-spread signal, for example, a so-called GPS signal. However, the signal is not limited to a GPS signal. In the following, for the sake of simplicity, description will be made using GPS as an example of a positioning system, but the present invention is also applicable to other satellite positioning systems (eg, Galileo, GLONASS, etc.). .

  The center frequency of the positioning signal is, for example, 1574.42 MHz. The spread frequency of the positioning signal is, for example, 1.023 MHz. In this case, the frequency of the positioning signal is the same as the frequency of the C / A (Coarse and Access) signal in the existing GPS L1 band. Therefore, since an existing positioning signal receiving circuit (for example, a GPS signal receiving circuit) can be used, the position information providing apparatus 100 can receive a positioning signal without adding a new circuit.

  The positioning signal may be modulated by a rectangular wave of 1.023 MHz. In this case, for example, if it is the same as the data channel of the positioning signal planned for new transmission in the L1 band, the user of the location information providing apparatus 100 receives a new GPS signal and uses a receiver that can process it. The positioning signal can be received. Note that the frequency of the rectangular wave is not limited to 1.023 MHz. The frequency for modulation can be determined by tradeoffs such as spectrum separation to avoid interference with existing C / A signals and / or other signals.

  Referring again to FIG. 1, the GPS satellite 110 is equipped with a transmitter 121 that transmits a positioning signal. Similar transmitters 122, 123, and 124 are mounted on the GPS satellites 111, 112, and 113, respectively. The transmitters 121, 122, 123, and 124 are collectively referred to as a transmitter 120.

  The position information providing apparatus 100-2 having the same function as the position information providing apparatus 100-1 can be used, for example, in a building 130 or other places where radio waves are difficult to reach. The place is not limited to a building such as the building 130 but may include an underground shopping center or a large-scale indoor facility.

  Indoor transmitters 200-1, 200-2, 200-3, 200-4 are attached to the ceiling of building 130. Hereinafter, the indoor transmitters are collectively referred to as an indoor transmitter 200. The indoor transmitter 200 has the same format as the GPS signal format, and can transmit a positioning signal whose data structure is partially different. This positioning signal includes position information for specifying a place where the indoor transmitter 200 is installed. Therefore, when the position information providing apparatus 100 receives such a positioning signal, the position can be output based on the position information. Hereinafter, such a signal is also referred to as an IMES (Indoor MEssaging System) signal. The data structure of the IMES signal will be described later.

  Position information providing apparatus 100-2 can receive positioning signals transmitted from indoor transmitters 200-1, 200-2, 200-3, 200-4. For the sake of simplicity, FIG. 1 shows a mode in which the indoor transmitter 200 is attached to the first floor of the building 130, but the same applies to the second floor, the third floor, and other floors. Can be attached.

  Here, the time of each of the indoor transmitters 200-1, 200-2, 200-3, 200-4 (hereinafter referred to as “ground time”) and the time of each of the GPS satellites 110, 111, 112, 113. More specifically, the time of each transmitter 120 (hereinafter referred to as “satellite time”) is not necessarily synchronized, and may be independent of each other. Also, the ground times need not be synchronized. Each satellite time is preferably synchronized.

  A spread spectrum signal transmitted as a positioning signal from each transmitter 120 mounted on each GPS satellite is generated by modulating a candidate message with a pseudo noise code (PRN (Pseudo Random Noise) code). The candidate message includes time data, orbit information, almanac, ionospheric correction data, and the like. Each transmitter 120 further has data (PRN-ID (Identification)) that can identify the transmitter 120 itself or a GPS satellite on which the transmitter 120 is mounted.

  The position information providing apparatus 100 includes data and a code generator for generating each pseudo noise code. When receiving the positioning signal, the position information providing apparatus 100 executes a demodulation process, which will be described later, using a code pattern of a pseudo noise code assigned to each GPS satellite, and from which GPS satellite the received signal is transmitted. Can be identified. In addition, in the new GPS signal, the PRN-ID is included in the data, and it is possible to prevent signal acquisition and tracking with an erroneous code pattern that is likely to occur when the reception level is low.

  The outline of the configuration of the transmitter 120 mounted on the GPS satellite is as follows. Each of the transmitters 120 includes an atomic clock, a storage device for storing data, a transmission circuit, a processing circuit for generating a positioning signal, and a code for performing spread spectrum encoding on the signal generated by the processing circuit And a transmission antenna. The storage device stores a candidate message having an ephemeris, an almanac of each satellite, ionospheric correction data, and the PRN-ID.

  The processing circuit generates a message for transmission using time information from the atomic clock and each data stored in the storage device.

  Here, for each transmitter 120, a code pattern of a pseudo noise code for performing spread spectrum encoding is defined in advance. Each code pattern is different for each transmitter (that is, for each GPS satellite). The encoding circuit performs spread spectrum encoding of the message using such a pseudo-noise code. The transmitter 120 converts the encoded signal into a high frequency and transmits it to outer space via a transmission antenna.

  As described above, the transmitter 120 transmits a spread spectrum signal that does not cause harmful interference with other transmitters. Here, “not causing harmful interference” can be ensured by a power level limited to such an extent that interference does not occur. Alternatively, it can be realized by an aspect of separating the spectrum. This signal is transmitted by a carrier wave called L1 band, for example. The transmitters 120, 121, 122, and 123 transmit positioning signals having the same frequency, for example, according to the spread spectrum communication method. Therefore, even when the positioning signal transmitted from each satellite is received by the position information providing apparatus 100-1, the positioning signals are received without mutual interference. Positioning signals transmitted from the indoor transmitters 200-1, 200-2, 200-3, and 200-4 on the ground are also received by the position information providing apparatus 100 without being interfered with each other, similarly to the signals transmitted from the satellites. Can be received.

[Technical idea of the present invention]
With reference to FIG. 2, the technical idea of the transmission system 20 according to the embodiment of the present invention will be described. FIG. 2 is a diagram illustrating a schematic configuration of the transmission system 20. The transmission system 20 includes a broadcasting system 250 and a mobile phone 900. Broadcast system 250 includes audio data 201, one-segment transmitter 700, antenna 203, channel number 204, indoor transmitter (IMES transmitter) 200, and antenna 206. The mobile phone 900 functions as a position information providing device.

  The cellular phone 900 includes antennas 712 and 722, a GPS reception LSI 724, one-segment channel number information 207, a one-segment tuner 208, and audio / video data 209.

  In the broadcast system 250, the IMES transmitter 200 transmits a positioning signal having the same format as that of the GPS signal from the antenna 206. This positioning signal includes channel number 204 and position information indicating the installation location of IMES transmitter 200. This positioning signal is received by the antenna 722 of the mobile phone 900 having a GPS positioning function. The GPS reception LSI 724 demodulates the received signal and acquires position information and a channel number. This channel number is used for channel selection of the one-segment tuner 208.

  In the broadcasting system 250, the audio / video data 201 is used for one-segment broadcasting. The audio / video data 201 is input to the one-segment transmitter 700. The one-segment transmitter 700 transmits the audio / video data 201 using the antenna 203. The audio / video data 201 is received by the antenna 712 of the mobile phone 900. The channel number 204 included in the positioning signal is acquired by the mobile phone 900, and the one-segment tuner 208 selects the channel number 204. Therefore, the signal received by the antenna 712 is received by the one-segment tuner 208, and the audio / video data 209 is acquired. Thereby, the mobile phone 900 can receive the one-segment broadcasting transmitted from the broadcasting system 250.

  In the broadcast system 250 of FIG. 2, the one-segment transmitter 700 and the indoor transmitter 200 are illustrated in a combined form, but the configuration of the broadcast system 250 is not limited to this form. That is, the one-seg transmitter 700 and the indoor transmitter 200 need only be associated with each other by the channel number 204, and the one-seg transmitter 700 and the indoor transmitter 200 are not necessarily included in the same casing. Also good.

[Configuration of indoor transmitter 200]
The configuration of the indoor transmitter 200-1 will be described with reference to FIG. FIG. 3 is a block diagram showing details of the hardware configuration of the indoor transmitter 200-1.

  The indoor transmitter 200-1 is electrically connected to the digital processing block 310, an EEPROM (Electronically Erasable and Programmable Read Only Memory) 240 electrically connected to the digital processing block 310, and the digital processing block 310. UART (Universal Asynchronous Receiver Transmitter) 350, digital input / output interface 360 electrically connected to digital processing block 310, clock 380 electrically connected to digital processing block 310, and digital processing block 310 The analog processing block 390 is electrically connected to the antenna processing unit 390, the antenna 392 is electrically connected to the analog processing unit lock 390, and the power source 394. The digital processing block 310 includes a CPU (Central Processing Unit) 320 and a RAM (Random Access Memory) 330.

  EEPROM 340 stores a program executed by CPU 320, data representing a place where indoor transmitter 200-1 is installed, and the like. The program or data is read from the EEPROM 340 and transferred to the RAM 330 when the indoor transmitter 200-1 is activated. The EEPROM 340 can further store data input from the outside of the indoor transmitter 200-1. The storage device for storing the program or data is not limited to the EEPROM 340. Any storage device that can store data in a nonvolatile manner may be used. Further, as will be described later, when external data is input, any storage device capable of writing data may be used. The data structure of the EEPROM 340 will be described later.

  The digital processing block 310 generates data serving as a source of a signal transmitted by the indoor transmitter 200-1 as a positioning signal. The digital processing block 310 sends the generated data as a bit stream to the analog processing block 390.

  The clock 380 supplies a clock signal that defines the operation of the CPU 320 or a clock signal for generating a carrier wave to the digital processing block 310.

  The digital input / output interface 360 can monitor the internal state of the transmitter (eg, “PLL Cntrl” signal). Alternatively, the digital input / output interface 360 inputs a code pattern of a pseudo-noise code for spreading and modulating a signal transmitted from the indoor transmitter 200-1 or inputs data defining a transmission output from the outside. Can be accepted. Furthermore, the input of the other data which should be transmitted from the indoor transmitter 200-1 can also be received. The other data is, for example, text data representing a place where the indoor transmitter 200-1 is installed. Alternatively, a video signal, an audio signal, a video / audio signal, or the like may be input. For example, when the indoor transmitter 200-1 is installed in a department store or other commercial facility, data for advertisement can be input to the indoor transmitter 200-1 as the other data.

  When the code pattern of the pseudo spread code is input to the indoor transmitter 200-1, the code pattern is written in a predetermined area in the EEPROM 340. Thereafter, the written PRN-ID is included in a signal for positioning. Other data is also written in an area reserved in advance in the EEPROM 340 according to the type of the data.

  The UART 350 is used to adjust the indoor transmitter 200-1. The external clock 370 is used to adjust the indoor transmitter 200-1, similar to the UART 350. For example, the external clock 370 receives a frequency input from a power line (not shown) and is also used to calibrate a transmission frequency of a signal for positioning.

  The analog processing block 390 generates a transmission signal by modulating a 1.57542 GHz carrier wave using the bit stream output from the digital processing block 310, and transmits the transmission signal to the antenna 392. The signal is transmitted from the antenna 392. In this way, a signal having the same configuration as the positioning signal is transmitted from the indoor transmitter 200-1. In this case, the content of the signal is not exactly the same as the content included in the positioning signal transmitted from the satellite. An example of the configuration of a signal transmitted from the indoor transmitter 200-1 will be described later (FIG. 5).

  The power source 394 supplies power to each unit constituting the indoor transmitter 200-1. As shown in FIG. 3, the power source 394 may be built in the indoor transmitter 200-1 or may be configured to accept an external power supply.

  In the above description, the CPU 320 is used as an arithmetic processing device for realizing the processing in the digital processing block 310, but other arithmetic processing devices may be used. Moreover, since the operation | movement which the indoor transmitter 200-1 implement | achieves is not complicated, the digital processing block 310 can be implement | achieved by the electric circuit comprised instead of CPU320, for example, so that each process may be implement | achieved.

  In FIG. 3, the clock signal (Clk) is supplied from the digital processing block 310 to the analog processing block 390, but may be supplied directly from the clock 380 to the analog processing block 390.

  Furthermore, in order to clarify the explanation, the digital processing block 310 and the analog processing block 390 are separately shown in the present embodiment, but physically, they may be mixedly mounted on one chip. .

  With reference to FIG. 4, the data structure of indoor transmitter 200-1 will be described. FIG. 4 is a diagram conceptually showing one mode of data storage in EEPROM 440 provided in indoor transmitter 200-1. EEPROM 440 includes areas 410 to 450 for storing data.

  In the area 400, a transmitter ID is stored as a number for identifying the transmitter. The transmitter ID is, for example, a number and / or an alphabetic character or other combination that is written in a memory in a nonvolatile manner when the transmitter is manufactured. The PRN-ID of the pseudo spread code assigned to the transmitter is stored in area 410. This PRN-ID is different from the PRN-ID assigned to the positioning satellite. The name of the transmitter is stored in area 420 as a character string, for example.

  The code pattern of the pseudo spread code assigned to the transmitter is stored in area 430. The code pattern of the pseudo spread code is selected from a finite number of code patterns assigned in advance for the position information providing system according to the embodiment of the present invention, and the code pattern of the pseudo spread code assigned to each satellite. The code pattern is different from the code pattern. As described above, the code pattern of the pseudo spread code can be changed to another code pattern input via the digital input / output interface 360.

  The number of pseudo-spread codes assigned for this position information providing system is limited, but the number of indoor transmitters depends on the size of the installation location of each transmitter or the configuration of the installation location (the number of floors of the building, Depending on the number of the area where the store is provided, etc., a plurality of indoor transmitters more than the number of code patterns may be used. Therefore, there can be a plurality of transmitters having the same pseudo-spread code pattern. In this case, the installation location of the transmitter having the same code pattern may be determined in consideration of the signal output. By doing so, it is possible to prevent a plurality of positioning signals using the same pseudo spread code code pattern from being received at the same time by the same position information providing apparatus.

  Position data for specifying the location where the indoor transmitter 200-1 is installed is stored in the area 440. The position data is represented as a combination of latitude, longitude, and altitude, for example. In the area 420, an address, a name of a building, and the like may be stored in addition to the position data or instead of the data.

  Channel number information is stored in area 450. The channel number information includes, for example, a channel number for receiving one-segment broadcasting. When a terminal (for example, a mobile phone, an electronic dictionary or other portable information terminal) having a function of receiving one-segment broadcasting obtains this channel number, the terminal can select a channel based on the channel number.

  A positioning signal transmitted from the transmitter will be described with reference to FIG. FIG. 5 is a diagram showing a configuration of a signal 500 transmitted by a transmitter mounted on a GPS satellite. The signal 500 includes five 300-bit subframes, that is, subframes 510 to 550. Subframes 510 to 550 are repeatedly transmitted by the transmitter. The subframes 510 to 550 are each 300 bits, for example, and transmitted at a bit rate of 50 bps (bit per second). Therefore, in this case, each subframe is transmitted in 6 seconds.

  The first subframe 510 includes a 30-bit transport overhead 511, 30-bit time information 512, and 240-bit message data 513. In detail, the time information 512 includes time information acquired when the subframe 510 is generated, and a subframe ID. Here, the subframe ID is an identification number for distinguishing the first subframe 510 from other subframes. The message data 513 includes a GPS week number, clock information, health information of the GPS satellite, orbit accuracy information, and the like.

  The second subframe 520 includes a 30-bit transport overhead 521, 30-bit time information 522, and 240-bit message data 523. The time information 522 has the same configuration as the time information 512 in the first subframe 510. The message data 523 includes an ephemeris. Here, the ephemeris (ephemeris) means orbit information of a satellite that transmits a positioning signal. The ephemeris is highly accurate information that is sequentially updated by a control station that manages the navigation of the satellite.

  The third subframe 530 has the same configuration as the second subframe 520. That is, the third subframe 530 includes a 30-bit transport overhead 531, 30-bit time information 532, and 240-bit message data 533. The time information 532 has the same configuration as the time information 512 in the first subframe 510. The message data 533 includes an ephemeris.

  The fourth subframe 540 includes a 30-bit transport overhead 541, 30-bit time information 542, and 240-bit message data 543. Unlike other message data 513, 523, and 533, message data 543 includes almanac information, a summary of satellite health information, ionospheric delay information, UTC (Coordinated Universal Time) parameters, and the like.

  The fifth subframe 550 includes a 30-bit transport overhead 551, 30-bit time information 552, and 240-bit message data 553. Message data 553 includes almanac information and a summary of satellite health information. Each of the message data 543 and 553 is composed of 25 pages, and the above different information is defined for each page. Here, the almanac information is information representing a general orbit of a satellite, and includes information on all GPS satellites as well as the satellite. When transmission of subframes 510 to 550 is repeated 25 times, the same information is transmitted by returning to the first page.

  Subframes 510 to 550 are transmitted by transmitters 121, 122, 123, and 124, respectively. When the subframes 510 to 550 are received by the position information providing apparatus 100, the position of the position information providing apparatus 100 includes the maintenance / management information included in the transport overheads 511 to 551, time information 512 to 552, and a message. Calculation is performed based on the data 513 to 553.

  The IMES signal 560 has the same data length as the message data 513 to 553 included in the subframes 510 to 550. The signal 560 is subordinate in that it has data (coordinate values, address, etc.) indicating the position of the source of the signal 560 and channel number information instead of the trajectory information expressed as ephemeris (message data 523, 533). Different from frames 510-550.

  That is, the IMES signal 560 includes, for example, a 6-bit PRN-ID, a 15-bit transmitter ID, an X coordinate value, a Y coordinate value, and a Z coordinate value of the place where the transmitter is installed, and altitude correction. It includes a coefficient (Zhf), channel number information, and a reserved area. The IMES signal 560 is transmitted from the indoor transmitters 200-1, 200-2, and 200-3 in place of the message data 513 to 553 included in the subframes 510 to 550. The channel number information is, for example, a channel number for receiving one-segment broadcasting.

  The PRN-ID 561 is an identification number of a code pattern of a group of pseudo-noise codes allocated in advance to a transmitter (for example, the indoor transmitters 200-1, 200-2, 200-3) that is a transmission source of the signal 560. It is. The PRN-ID 561 is different from the identification number of the code pattern of a group of pseudo-noise codes assigned to the transmitter 120 mounted on each GPS satellite, but for the code patterns generated from the same series of code strings. Assigned number. The position information providing apparatus obtains one of the code patterns of the pseudo-noise code assigned for the indoor transmitter from the received signal 560, so that the signal is transmitted from the transmitter 120 mounted on the satellite. The subframes 510 to 550 or the signal 560 transmitted from the indoor transmitter 200 is specified.

  The X coordinate value, the Y coordinate value, and the Z coordinate value are data representing the position where the indoor transmitter 200-1 is attached. The X coordinate value, the Y coordinate value, and the Z coordinate value are expressed, for example, as latitude, longitude, and altitude. The altitude correction coefficient is used to correct the altitude specified by the Z coordinate value. The altitude correction coefficient is not an essential data item. Therefore, when the accuracy higher than the altitude specified by the Z coordinate value is not required, the coefficient may not be used. In this case, for example, data representing “NULL” can be stored in the area allocated for the altitude correction coefficient.

  As the channel number information, the channel number information stored in the area 450 of the EEPROM 340 is used.

[Signal configuration]
With reference to FIG. 6, the configuration of IMES signal 560 according to the embodiment of the present invention will be described. FIG. 6 is a diagram representing an outline of IMES signal 560. The IMES signal 560 includes a preamble 610, a message type 620, a unique word 630, channel number information 640, an auxiliary value 650, and a parity 660. The unique word 630, the channel number information 640, and the auxiliary value 650 constitute an ID field.

  Preamble 610 includes data for identifying indoor transmitter 200-1. Message type 620 defines the type of IMES signal 560. The unique word 630 includes information unique to the IMES signal 560, such as the name of the indoor transmitter 200-1. Channel number information 640 corresponds to channel number information stored in area 450 of EEPROM 340.

  The auxiliary value is data for controlling the operation of the receiver, such as whether to forcibly change the channel with respect to the receiver (for example, the position information providing apparatus 100-1) that has received the IMES signal 560. including.

[Configuration of 1Seg broadcasting device]
With reference to FIG. 7, a configuration of one-segment transmitter 700 according to the embodiment of the present invention will be described. FIG. 7 is a block diagram illustrating an outline of a hardware configuration of the one-segment transmitter 700.

  The one-segment transmitter 700 includes a memory card 210, a repetitive reading device 220, an interleaver 230, an OFDM (Orthogonal Frequency Division Multiplexing) modulator 240, channel number information 250, a VCO (Voltage-Controlled Oscillator) oscillator 260, An up-converter 270, an amplifier / attenuator 280, and an antenna 290 are provided.

  The memory card 210 stores pre-encoded video data for transmission. The video data includes advertisement contents of a business performed by an installation company of the one-segment transmitter 700. For example, when the installation company is a restaurant, a moving image showing a recommended menu is included. If the installation company is a bank, this includes new services, advertisements for financial products, etc. If the installation company is a movie theater, it includes the intro part of the movie being screened and the movie scheduled to be screened in the future.

  The repeated reading device 220 repeatedly reads the video data as described above stored in the memory card 210. Accordingly, the one-segment transmitter 700 can broadcast the same video for a predetermined time, for example. Note that the broadcast may be repeated at regular intervals, such as every 30 minutes or every hour.

  The interleaver 230 rearranges the data output from the repeated reading device 220. For example, the interleaver 230 divides the input continuous data into different blocks and rearranges them. Thereby, the noise guided by the transmission path from the memory card 210 to the interleaver 230 is expressed as being statistically independent from the data of the video signal. Therefore, better error correction is possible. The OFDM modulator 240 performs OFDM modulation on the output data from the interleaver 230. The output of OFDM modulator 240 is sent to upconverter 270.

  Channel number information 250 includes a number to be transmitted as a channel number for one-segment broadcasting. Channel number information 250 is input to VCO oscillator 260. The VCO oscillator 260 modulates the reference frequency based on the channel number information 250. The output of the VCO oscillator 260 is input to the up-converter 270.

  Upconverter 270 upconverts the output signal using the output from OFDM modulator 240 and the output from VCO oscillator 260. The up-converted signal is input to the amplifier / attenuator 280.

  The amplifier / attenuator 280 amplifies the signal upconverted by the upconverter 270 and sends the amplified signal to the antenna 290. Alternatively, the amplifier / attenuator 280 attenuates the input signal to a preset level or according to a command given from the outside, and outputs the attenuated signal. Thereafter, the signal output from the amplifier / attenuator 280 is transmitted via the antenna 290.

[Configuration of Location Information Providing Device]
With reference to FIG. 8, a configuration of position information providing apparatus 100-1 according to the embodiment of the present invention will be described. FIG. 8 is a diagram illustrating an outline of a hardware configuration of position information providing apparatus 100-1. The position information providing apparatus 100-1 is realized as a mobile phone in a certain aspect, but may be realized as another portable information terminal. For example, a portable radio or a personal computer may be used.

  The position information providing apparatus 100-1 includes a mobile phone antenna 702, a radio transmission / reception LSI 704, a baseband / protocol processing LSI 706, a one-segment antenna 712, a one-segment radio reception LSI 714, a one-segment OFDM demodulation LSI 716, and one-segment video decoding. An LSI 718, a GPS antenna 722, a GPS reception LSI 724, a CPU 730, and a memory 740 are provided. The CPU 730 includes a one-segment reception application unit 732, a GPS application unit 734, an IMES reception unit 736, and a one-segment channel number extraction unit 738.

  A signal received by the mobile phone antenna 702 is sent to the wireless transmission / reception LSI 704. The radio transmission / reception LSI 704 performs front-end processing on the signal and transmits the processed signal to the baseband / protocol processing LSI 706. The baseband / protocol processing LSI 706 demodulates the signal and sends the digitally processed data to the CPU 730.

  The one-segment antenna 712 receives a one-segment broadcast. The received signal is sent to the one-segment radio reception LSI 714. The one-seg radio reception LSI 714 performs front-end processing on the signal and transmits the processed signal to the one-seg OFDM demodulation LSI 716. The one-segment OFDM demodulation LSI 716 demodulates the signal and sends the signal obtained by the demodulation to the one-segment video decoding LSI 718. The one-segment video decoding LSI 718 extracts a video signal from the demodulated signal and sends the extracted signal to the CPU 730. This signal is used to display an image. On the other hand, the audio signal subjected to the front end processing from the one-segment radio reception LSI 714 is sent to the CPU 730.

  The GPS antenna 722 receives a signal transmitted by a GPS satellite. The received signal is sent to the GPS reception LSI 724. The GPS reception LSI 724 performs front-end processing on the signal, demodulates it, locks it with the code pattern that the position information providing apparatus 100-1 has in advance, and specifies the code pattern of the GPS signal. Thereafter, the GPS reception LSI 724 performs positioning processing using the specified GPS signals, preferably four, and sends the processed data to the GPS application unit 734.

  In CPU 730, one seg reception application unit 732 executes processing for receiving and displaying one seg broadcasting. Such processing may include image display, channel selection, data broadcast display, and the like.

  On the other hand, the GPS application unit 734 performs positioning calculation using the signal sent from the GPS receiving LSI 724, and performs positioning processing when the signal received by the GPS antenna 722 is a signal transmitted from a GPS satellite. The position information based on (for example, latitude and longitude altitude) is displayed. On the other hand, when the signal received by the GPS antenna 722 is a signal transmitted by the indoor transmitter 200, the GPS application unit 734 sets the position information included in the signal (for example, the indoor transmitter 200 is installed). The coordinate value of the place being placed and the name of the installation place (for example, address, building name, floor, etc.) are displayed.

  This process is realized by the cooperation of the GPS application unit 734 and the IMES receiving unit 736. In the example of FIG. 7, the GPS application unit 734 and the IMES receiving unit 736 are shown as separate configurations, but these functions are realized by the CPU 730. The positioning process based on the signal transmitted from the GPS satellite and the position information specifying process based on the signal transmitted from the indoor transmitter 200, also referred to as IMES, are not necessarily executed serially. And can be executed. For example, when the GPS reception LSI 724 includes a plurality of parallel correlators, the lock process can be executed in parallel. Therefore, the CPU 730 performs a parallel positioning process based on the signal transmitted by the GPS satellite and the position information specifying process based on the IMES signal 560 transmitted by the indoor transmitter 200 based on the signal received by the GPS antenna 722. And can be executed.

  In CPU 730, one seg channel number extraction unit 738 extracts channel number information 640 of one seg broadcasting from IMES signal 560. The CPU 730 uses the channel number information 640 to cause the one-segment radio reception LSI 714 to select a channel. Thereby, the automatic line station of the position information providing apparatus 100-1 is realized.

  Each function included in the CPU 730 is realized by the CPU 730 executing a program configured in advance so as to realize the function. Therefore, it can be said that the most essential part of the position information providing apparatus 100-is software executed by the CPU 730.

  The software is stored in, for example, the memory 740 in an executable format. The memory 740 can be, for example, a flash ROM, a flash memory or other recording medium, or a memory card or other removable data recording medium.

  The position information providing apparatus 100-1 will be described with reference to FIG. FIG. 9 is a block diagram illustrating an outline of a hardware configuration of the position information providing apparatus 100.

  The position information providing apparatus 100 includes an antenna 722, an RF (Radio Frequency) front circuit 804 electrically connected to the antenna 722, a down converter 806 electrically connected to the RF front circuit 804, and a down converter A / D (Analog to Digital) converter 808 electrically connected to 806, baseband processor 810 electrically connected to A / D converter 808, and electrically connected to baseband processor 810 A memory 820, a navigation processor 830 electrically connected to the baseband processor 810, and a display 840 electrically connected to the navigation processor 830. A configuration for transmitting / receiving a signal for a mobile phone (antenna 702, wireless transmission / reception LSI 704, baseband / protocol processing LSI 706) and a configuration for receiving one-segment broadcasting (antenna 712, one-seg wireless reception LSI 714, one-seg The OFDM demodulation LSI 716 and the one-segment video decoding LSI 718) are the same as those shown in FIG. 7, and will not be repeated.

  The memory 820 includes a plurality of areas for storing code patterns of pseudo-noise codes, which are data for identifying each transmission source of positioning signals. As an example, in one aspect, when 48 code patterns are used, memory 820 includes regions 821-1 to 821-48 as shown in FIG. In another aspect, when more code patterns are used, a larger area is secured in the memory 820. Conversely, a code pattern that is smaller than the number of areas reserved in the memory 820 may be used.

  As an example, when 48 code patterns are used, for example, when 24 satellites are used in the satellite positioning system, 24 identification data for identifying each satellite and 12 spare data are included in the region. 821-1 to 821-36. At this time, for example, the area 821-1 stores the code pattern of the pseudo-noise code for the first satellite. From this, the code pattern is read out, and the cross-correlation process with the received signal is performed, whereby the signal can be tracked and the navigation message included in the signal can be decoded. Here, the method of storing and reading the code pattern is exemplarily shown, but a method of generating a code pattern by a code pattern generator is also possible. The code pattern generator is realized, for example, by combining two feedback shift registers. It should be noted that the configuration and operation of the code pattern generator can be easily understood by those skilled in the art. Therefore, detailed description thereof will not be repeated.

  Similarly, code patterns of pseudo noise codes assigned to indoor transmitters that transmit positioning signals including IMES signals are stored in regions 821-37 to 821-48. For example, the code pattern of the assigned pseudo-noise code for the first indoor transmitter is stored in area 821-37. In this case, in this embodiment, twelve types of indoor transmitters 200 having different code patterns can be used, but the indoor transmitter using the same code pattern in a range that can be received by the same position information providing apparatus. Each indoor transmitter may be arranged so that there is no 200. In this way, even when 12 types of code patterns are available, 12 or more indoor transmitters can be installed on the same floor of the building 130, for example.

  The baseband processor 810 performs positioning based on a correlator unit 812 that receives input of a signal output from the A / D converter 808, a control unit 814 that controls the operation of the correlator unit 812, and data output from the control unit 814. And a determination unit 816 for determining a signal transmission source. The navigation processor 830 includes an outdoor positioning unit 832 for measuring the position of the outdoor location information providing apparatus 100 based on a signal output from the determination unit 816, and an indoor position based on data output from the determination unit 816. And an indoor positioning unit 834 for deriving information representing the position of the information providing apparatus 100.

  The antenna 722 can receive positioning signals transmitted from the GPS satellites 110, 111, and 112 and positioning signals transmitted from the indoor transmitter 200-1. In addition, when position information providing apparatus 100 is implemented as a mobile phone, antenna 722 can transmit and receive a signal for wireless telephone or a signal for data communication in addition to the above-described signals.

  The RF front circuit 804 receives the signal received by the antenna 722 and performs noise removal or filter processing for outputting only a signal having a predetermined bandwidth. A signal output from the RF front circuit 804 is input to the down converter 806.

  The down converter 806 amplifies the signal output from the RF front circuit 804 and outputs it as an intermediate frequency IF (Intermediate Frequency). This signal is input to the A / D converter 808. The A / D converter 808 performs a digital conversion process on the input intermediate frequency signal and converts it into digital data. Digital data is input to the baseband processor 810.

  In the baseband processor 810, the correlator unit 812 performs a correlation process between the code pattern read out from the memory 820 by the control unit 814 and the received signal. For example, the correlator unit 812 performs matching between two types of code patterns provided by the control unit 814 that are different in code phase by 1 bit and digital data transmitted from the A / D converter 808. The correlator unit 812 tracks the positioning signal received by the position information providing apparatus 100 using each code pattern, and specifies a code pattern having an arrangement that matches the bit arrangement of the positioning signal. Thereby, since the code pattern of the pseudo noise code is specified, the position information providing apparatus 100 can determine from which satellite the received positioning signal is transmitted or from the indoor transmitter. Further, the position information providing apparatus 100 can demodulate and decode the message using the specified code pattern.

  Specifically, the determination unit 816 performs the determination as described above, and sends data corresponding to the determination result to the navigation processor 830. The determination unit 816 determines whether or not the PRN-ID included in the received positioning signal is a PRN-ID assigned to a transmitter other than the transmitter mounted on the GPS satellite.

  Here, as an example, a case where 24 GPS satellites are used in the positioning system will be described. In this case, if a spare code is included, for example, 36 pseudo-noise codes are used. At this time, PRN-01 to PRN-24 are used as numbers for identifying each GPS satellite (PRN-ID), and PRN-25 to PRN-36 are used as numbers for identifying spare satellites. The spare satellite is a satellite that is newly launched in addition to the satellite that was originally launched. That is, such a satellite is launched in preparation for a failure of a GPS satellite or a transmitter mounted on the GPS satellite.

  Furthermore, the code patterns of the twelve pseudo noise codes are assigned to a transmitter (for example, indoor transmitter 200-1) other than the transmitter mounted on the GPS satellite. At this time, a number different from the PRN-ID assigned to the satellite, for example, PRN-37 to PRN-48 is assigned to each transmitter. Therefore, in this example, 48 PRN-IDs exist. Here, PRN-37 to PRN-48 are assigned to the indoor transmitters according to the arrangement of the indoor transmitters, for example. If a transmission output that does not interfere with a signal transmitted from each indoor transmitter is used, the same PRN-ID may be used for different indoor transmitters. With such an arrangement, more transmitters can be used than the number of PRN-IDs allocated for terrestrial transmitters.

  Therefore, the determination unit 816 refers to the code pattern of the pseudo noise code stored in the memory 820, and the code pattern obtained from the received positioning signal matches the code pattern assigned to the indoor transmitter. Judge whether to do. If these code patterns match, the determination unit 816 determines that the positioning signal is transmitted from the indoor transmitter. Otherwise, the determination unit 816 determines that the signal is transmitted from a GPS satellite, and stores in the memory 820 which satellite the allocated code pattern is the code pattern assigned to. It is determined with reference to the code pattern. Although an example in which a code pattern is used is shown as an aspect of determination, the above determination may be made by comparing other data. For example, comparison using PRN-ID may be used for the determination. In addition, a plurality of determination processes can be executed in parallel. In this case, the determination unit 816 is realized by, for example, a plurality of correlators configured to operate in parallel.

  When the received signal is transmitted from each GPS satellite, the determination unit 816 sends data acquired from the identified signal to the outdoor positioning unit 832. The data obtained from the signal includes a navigation message. On the other hand, when the received signal is transmitted from the indoor transmitter 200-1 or the like, the determination unit 816 sends data acquired from the signal to the indoor positioning unit 834. This data is a coordinate value set in advance as data for specifying the position of the indoor transmitter 200-1. Alternatively, in another aspect, a number that identifies the transmitter may be used.

  In the navigation processor 830, the outdoor positioning unit 832 executes processing for calculating the position of the position information providing apparatus 100 based on the data transmitted from the determination unit 816. Specifically, the outdoor positioning unit 832 calculates the propagation time of each signal using data included in signals transmitted from three or more GPS satellites (preferably four or more), and the calculation result Based on the above, the position of the position information providing apparatus 100 is calculated. This process is executed using a known satellite positioning method. This process can be easily understood by those skilled in the art. Therefore, details of the description will not be repeated here.

  On the other hand, in the navigation processor 830, the indoor positioning unit 834 performs a positioning process when the position information providing apparatus 100 exists indoors based on the data output from the determination unit 816. As will be described later, the indoor transmitter 200-1 transmits a positioning signal including data (time data) for specifying a location. Therefore, when the position information providing apparatus 100 receives such a signal, the data included in the signal is extracted, and the position information (for example, coordinate value, address, area defined by the commercial facility) indicated by the data is extracted. Or the like) may be the position of the position information providing apparatus 100. The indoor positioning unit 834 performs this process. Data calculated by the outdoor positioning unit 832 or the indoor positioning unit 834 is used for display on the display 840. Specifically, these data are incorporated into the data for displaying the screen, and an image representing the measured position or an image for displaying the place where the indoor transmitter 200-1 is installed is generated. Displayed on the display 840.

[One aspect of position information providing apparatus]
Here, with reference to FIG. 10, the structure of the mobile phone 900 which is an aspect of the position information providing apparatus will be described. FIG. 10 is a block diagram showing a hardware configuration of mobile phone 900. The cellular phone 900 includes an antenna 702, a communication device 902, a CPU 910, an operation button 920, a one-segment receiver 930, a flash memory 944, a RAM 946, a data ROM 948, which are electrically connected to each other. A memory card driving device 980, an audio signal processing circuit 970, a microphone 972, a speaker 974, a display 950, an LED (Light Emitting Diode) 976, a data communication I / F 978, and a vibrator 984 are provided.

  A signal received by the antenna 702 is transferred to the CPU 910 by the communication device 902. CPU 910 transfers the signal to audio signal processing circuit 970. The audio signal processing circuit 970 performs predetermined signal processing on the signal and sends the processed signal to the speaker 974. The speaker 974 outputs sound based on the signal.

  The microphone 972 accepts an utterance to the mobile phone 900 and outputs a signal corresponding to the uttered voice to the voice signal processing circuit 970. The audio signal processing circuit 970 performs signal processing defined in advance for a call based on the signal, and sends the processed signal to the CPU 910. CPU 910 converts the signal into data for transmission and sends the data to communication device 902. When communication apparatus 902 transmits the signal via antenna 702, a base station (not shown) receives the signal.

  The flash memory 944 stores data sent from the CPU 910. Conversely, the CPU 910 reads data stored in the flash memory 944 and executes a predetermined process using the data.

  The RAM 946 temporarily holds data generated by the CPU 910 based on an operation performed on the operation button 920. The data ROM 948 stores data or a program for causing the mobile phone 900 to execute a predetermined operation. The CPU 910 reads the data or program from the data ROM 948 and causes the mobile phone 900 to execute a predetermined process.

  The memory card driving device 980 accepts the mounting of the memory card 982. The memory card driving device 980 reads out data stored in the memory card 982 and sends it to the CPU 910. Conversely, the memory card driving device 980 writes the data output by the CPU 910 into the data storage area secured in the memory card 982.

  The audio signal processing circuit 970 executes processing for a signal used for a call as described above. Note that the CPU 910 and the audio signal processing circuit 970 may be configured integrally.

  Display 950 displays an image defined by the data based on the data output from CPU 910. For example, when the flash memory 944 stores data for accessing the information providing server 1230 (for example, URL (Uniform Resource Locator)), the display 950 displays the URL. Alternatively, the display 950 displays an image based on the video signal acquired from the one-segment broadcasting signal by the one-segment receiving device 930. The image may be either a still image or a moving image. The moving image may include, for example, advertisement information of a one-seg broadcast sender (operator of a shop, restaurant, bank or other commercial facility).

  The LED 976 realizes a predetermined light emission operation based on a signal from the CPU 910. For example, when the LED 976 can display a plurality of colors, the LED 976 emits light in a color associated with the data based on data included in a signal output from the CPU 910.

  The data communication I / F 978 accepts attachment of a data communication cable. The data communication I / F 978 sends a signal output from the CPU 910 to the cable. Alternatively, the data communication I / F 978 sends data received via the cable to the CPU 910.

  Vibrator 984 performs an oscillation operation at a predetermined frequency based on a signal output from CPU 910. The basic operation of the mobile phone 900 can be easily understood by those skilled in the art. Therefore, detailed description will not be repeated here. For example, vibrator 984 can vibrate when mobile phone 900 detects reception of a one-segment broadcast after receiving signal 560.

  The cellular phone 900 further includes a positioning signal receiving antenna 722 and a positioning signal reception front end unit 914.

  Here, the positioning signal reception front end unit 914 includes an RF front circuit 804, a down converter 806, and an A / D converter 808 in the configuration realized by hardware in the position information providing apparatus 100 in FIG. . On the other hand, the processing of the baseband processor 810 and the navigation processor 830 assumed to be realized by software in the configuration of the position information providing apparatus 100 is executed by the positioning processing unit 912 on the CPU 910 by a program loaded from the flash memory 944 to the RAM 946. can do. In this case as well, the processing of the correlator unit 812 can be realized by hardware instead of software.

<First Modification>
Note that the hardware configuration and software configuration are not limited to those described above. For example, the following configuration may be used.

  A modification of the embodiment of the present invention will be described with reference to FIG. FIG. 11 is a block diagram showing an outline of the hardware configuration of the position information providing apparatus 1000 according to this modification. The position information providing apparatus 1000 according to the present modification includes a plurality of correlators instead of the configuration of the correlator unit 812 included in the position information providing apparatus 100 described above. With this configuration, the processing for matching the positioning signal to the replica is executed in parallel, so that the time for calculating the position information is shortened.

  The position information providing apparatus 1000 according to this modification includes an antenna 1010, a bandpass filter 1020 electrically connected to the antenna 1010, a low noise amplifier 1030 electrically connected to the bandpass filter 1020, and a low noise amplifier ( LNA) 1030, a down converter 1040 electrically connected to the down converter 1040, a band pass filter 1050 electrically connected to the down converter 1040, an A / D converter 1060 electrically connected to the band pass filter 1050, and A A parallel correlator 1070 including a plurality of correlators electrically connected to the / D converter 1060, a processor 1080 electrically connected to the parallel correlator 1070, and a memory 1090 electrically connected to the processor 1080 are included.

  The parallel correlator 1070 includes n correlators 1070-1 to 1070-n. Each correlator simultaneously executes matching between the received positioning signal and a code pattern generated to demodulate the positioning signal based on a control signal output from the processor 1080.

  Specifically, the processor 1080 gives each parallel correlator 1070 a command to generate a code pattern that reflects a delay that may occur in the pseudo-noise code (shifting the code phase). This command is, for example, the number of satellites × 2 × 1023 (the length of the code pattern of the pseudo-noise code used) in the current GPS. Each parallel correlator 1070 generates a code pattern having a different code phase using a code pattern of a pseudo-noise code defined for each satellite based on a command given to each parallel correlator 1070. Then, one of all the generated code patterns matches the code pattern of the pseudo noise code used for modulation of the received positioning signal. Therefore, the code pattern of the pseudo-noise code can be instantly specified by configuring the number of correlators necessary for performing the matching process using each code pattern as the parallel correlator 1070 in advance. This processing can be similarly applied when the position information providing apparatus 100 receives a signal from an indoor transmitter. Therefore, even when the user of the position information providing apparatus 100 is indoors, the position information can be acquired instantaneously.

  In other words, the parallel correlator 1070 performs matching in parallel for all of the pseudo-noise code code pattern defined for each satellite and the pseudo-noise code code pattern defined for each indoor transmitter at the maximum. Is possible. In addition, according to the relationship between the number of correlators and the number of code patterns of pseudo-noise codes assigned to satellites and indoor transmitters, all of the code patterns of pseudo-noise codes specified for each satellite and each indoor transmitter are as follows: Even when matching is not performed collectively, the time required to acquire the position information can be greatly shortened by parallel processing using a plurality of correlators.

  Here, since the satellite and the indoor transmitter transmit signals by the spread spectrum method which is the same communication method, the pseudo-noise code patterns assigned to the satellite and the indoor transmitter can be used in the same series. The parallel correlator can be shared for both the signal from the satellite and the transmission from the indoor transmitter, and the reception processing can be performed in parallel without specially distinguishing between the two.

  The position information providing apparatus 1000 in FIG. 11 is not particularly limited, but in signal processing from reception of a positioning signal to generation of information displayed on a display (not shown in FIG. 11), an antenna 1010 and a bandpass filter 1020. The low noise amplifier (LNA) 1030, the down converter 1040, the band pass filter 1050, the A / D converter 1060, and the correlator 1070 are configured by hardware, and the arithmetic processing for positioning (control processing described in FIG. 12) The processor 1080 can be executed by a program stored in the memory 1090.

[Control structure]
Then, with reference to FIG. 12, the control structure of the positional information provision apparatus 100 which concerns on embodiment of this invention is demonstrated. FIG. 12 is a flowchart showing a part of a series of operations executed by mobile phone 900 functioning as a position information providing apparatus.

  In step S1110, position information providing apparatus 100 acquires (tracks and captures) a positioning signal. Specifically, the baseband processor 810 receives an input of a received positioning signal (data after digital conversion processing) from the A / D converter 808. The baseband processor 810 generates, as a pseudo-noise code replica, code patterns having different code phases reflecting a possible delay, and detects the presence or absence of correlation between the code pattern and the received positioning signal. The number of generated code patterns is, for example, twice the number of bits of the code pattern. As an example, for example, when the chip rate is 1023 bits, 2046 code patterns having a delay of ½ bit, that is, a code phase difference may be generated. And the process which takes the correlation with the received signal using each code pattern is performed. The baseband processor 810 may lock the code pattern and specify the satellite that has transmitted the positioning signal based on the code pattern when an output having a predetermined intensity or more is detected in the correlation processing. it can. There is only one pseudo-noise code having the bit pattern of the code pattern. As a result, the pseudo-noise code used for spread spectrum encoding of the received positioning signal is specified.

  As will be described later, the process for obtaining a correlation between a signal acquired by reception and a code pattern of a locally generated replica can be realized as a parallel process.

  In step S1120, baseband processor 810 identifies the source of the positioning signal. Specifically, the determination unit 816 is based on the PRN-ID associated with the transmitter that uses the code pattern of the pseudo-noise code used at the time of modulation to generate the signal (for example, the memory in FIG. 9). 820), identifying the source of the signal. When the positioning signal is transmitted from the outdoors, the baseband processor 810 switches the control to step S1130. If the source of the positioning signal is outdoor or indoor, baseband processor 810 switches control to step S1150. If the transmission source is indoors, the baseband processor 810 switches control to step S1170.

  In step S1130, position information providing apparatus 100 obtains data included in the signal by demodulating the positioning signal. Specifically, the outdoor positioning unit 832 of the navigation processor 830 uses the code pattern temporarily stored in the memory 820 for the positioning signal (the code pattern in which the above-described “lock” is performed, hereinafter “lock”). The navigation message is acquired from the subframes constituting the signal by superimposing using the above-described code pattern ").

  In step S1150, position information providing apparatus 100 obtains data included in the signal by demodulating the positioning signal. Specifically, the outdoor positioning unit 832 obtains data in subframes constituting the positioning signal by superimposing the locked code pattern on the positioning signal transmitted by the baseband processor 810. In this case, since the position information providing apparatus 100 receives both the positioning signal from the GPS satellite and the positioning signal from the indoor transmitter 200, it operates as a “hybrid” mode. . Therefore, a navigation message having synchronized time data is acquired for the signal from each satellite, and data having the above coordinate values and other position information is acquired for the signal from the indoor transmitter.

  In step S1152, the indoor positioning unit 834 performs processing for acquiring the X coordinate value, the Y coordinate value, and the Z coordinate value from the positioning signal transmitted by the indoor transmitter 200-1, and uses each coordinate value as position information. To derive. The outdoor positioning unit 832 acquires a navigation message from a positioning signal transmitted by a GPS satellite and performs processing. Thereafter, control is transferred to step S1160. Note that the process execution order of the process of step S1150 and the process of step S1152 may be reversed.

  In step S1160, outdoor positioning unit 832 executes normal navigation message processing for calculating a position using the acquired four or more navigation messages. In step S1162, outdoor positioning unit 832 calculates the position of mobile phone 900 based on the demodulated signal. In step S1164, outdoor positioning unit 832 causes display 950 to display position information based on the calculated data. In another aspect, the outdoor positioning unit 832 accesses the calculated position information (that is, the coordinate value of the mobile phone 400) to a server that provides the position information via the data communication I / F 978 or the communication device 902. A simple map may be displayed.

  In step S1170, position information providing apparatus 100 acquires the data included in the signal by demodulating the positioning signal. Specifically, the indoor positioning unit 834 acquires message data from the subframes constituting the positioning signal by superimposing the locked code pattern on the positioning signal transmitted from the baseband processor 810. . This message data is included in the positioning signal transmitted by the indoor transmitter instead of the navigation message included in the positioning signal transmitted from the satellite. Therefore, the data length of the message data is preferably the same as the data length of the navigation message.

  In step S1172, the indoor positioning unit 834 uses the coordinate values (that is, data for specifying the installation location of the indoor transmitter (for example, the X coordinate value, the Y coordinate value, and the Z coordinate value in the signal 560)). To get. If the frame includes text information representing the installation location or the address of the installation location instead of such coordinate values, the text information is acquired.

  In step S1174, baseband processor 810 determines whether or not channel number information for one-segment broadcasting has been received. This determination is made based on the result of the process for extracting channel number information 640 from IMES signal 560. When baseband processor 810 determines that channel number information 640 has been received (YES in step S1174), control is switched to step S1180. Otherwise (NO in step S1174), baseband processor 810 switches control to step S1190.

  In step S1180, baseband processor 810 determines whether or not mobile channel selection in mobile phone 900 is valid. This determination is made, for example, by checking whether or not data for setting automatic channel selection to be valid is set in the flash memory 944. Alternatively, in another aspect, it can also be performed by confirming whether or not the auxiliary value 650 of the IMES signal 560 is data representing forced tuning. When baseband processor 810 determines that the mobile channel selection is valid (YES in step S1180), it switches control to step S1182. Otherwise (NO in step S1180), baseband processor 810 switches control to step S1190.

  In step S1182, baseband processor 810 performs channel selection based on the received channel number information. Specifically, the baseband processor 810 controls to select a channel specified by the received channel number information by sending a command to the one-segment receiver 930.

  In step S1184, baseband processor 810 causes display 950 to display an image based on the channel selection. The video includes, for example, a one-segment broadcasting image transmitted by a user of an indoor transmitter that transmits the signal 560. The image includes a recommended menu of the restaurant, an introduction video of the recommended product of the shop, a new product in the bank, an advertisement for the new service, special sale information for each store in the supermarket, and the like.

  In step S1190, baseband processor 810 causes display 950 to display position information based on signal 560. The display 950 displays, for example, the address of the building 130 where the indoor transmitter 200 is installed or the name of the store where any of the indoor transmitters is installed.

[Screen display mode]
With reference to FIG. 13, the display mode of the screen of position information providing apparatus 100 will be described in the present embodiment. FIG. 13 is a diagram illustrating screen display on display 950 of position information providing apparatus 100.

  When the position information providing apparatus 100 receives a positioning signal transmitted from each GPS satellite outdoors, the display 950 displays an icon 1210 indicating that the position information is acquired based on the positioning signal. Thereafter, when the user of the position information providing apparatus 100 moves indoors, the position information providing apparatus 100 cannot receive a positioning signal transmitted from each GPS satellite. Instead, location information providing apparatus 100 receives a signal transmitted by, for example, indoor transmitter 200-1. As described above, this signal is transmitted by the same method as the positioning signal transmitted from the GPS satellite. Therefore, position information providing apparatus 100 performs the same process on the signal as the process executed when a positioning signal is received from the satellite. When the position information providing apparatus 100 acquires position information from the signal, an icon 1220 indicating that the position information has been acquired based on a signal transmitted from a transmitter installed indoors is displayed on the display 950.

  On the other hand, when the user goes out of the room to the outdoors and the position information providing apparatus 100 receives the positioning signal from the GPS satellite, the position information providing apparatus 100 can execute the positioning process again and derive the position information. Display 950 displays icon 1210 again.

  As described above, the location information providing apparatus 100 according to the first embodiment of the present invention is a transmission installed at a place where a radio wave from a GPS satellite cannot be received, such as an indoor or underground mall. The radio waves transmitted from the devices (for example, indoor transmitters 200-1, 200-2, 200-3) are received. The position information providing apparatus 100 acquires information (for example, coordinate value, address) specifying the position of the transmitter from the radio wave and displays the information on the display 950. Thereby, the user of the position information providing apparatus 100 can know the current position. In this way, position information is provided even in a place where a positioning signal cannot be received directly.

  With reference to FIG. 14, the display mode of the screen of position information providing apparatus 100 will be further described. FIG. 14 is a diagram showing a change in the screen of display 950 in a place where a positioning signal emitted from a GPS satellite cannot be received. This place is, for example, a restaurant area, a shopping mall, or the like.

  When the user of the location information providing device 100 is in front of “ABC restaurant”, the location information providing device 100 generates a signal 560 emitted from an indoor transmitter (not shown) installed near the entrance of the ABC restaurant. Receive. The format of the signal 560 is the same as the format of the GPS signal as described above. Therefore, the position information providing apparatus 100 acquires information (for example, latitude / longitude / altitude, address, address of the area, etc.) indicating the position of the ABC restaurant from the IMES signal, and displays it on the display 950 as a screen 1310. .

  The signal 560 further includes channel number information of one-segment broadcasting. Therefore, the position information providing apparatus 100 acquires channel number information from the IMES signal and selects a channel specified by the acquired channel number information. After channel selection, position information providing apparatus 100 displays on display 950 a screen 1320 indicating that the one-segment broadcasting has been received.

  When the indoor transmitter attached in front of the ABC restaurant broadcasts “Today's recommended menu” or the like as a one-segment broadcast, the location information providing apparatus 100 sequentially displays the broadcast contents as a screen 1330. In this way, the one-segment broadcasting that the user of the indoor transmitter broadcasts based on the signal transmitted from the nearest indoor transmitter without the user of the location information providing apparatus 100 performing channel selection operation. Can be received. This facilitates information provision using the position information providing apparatus 100. In addition, the user can easily obtain information.

  FIG. 15 is a diagram illustrating still another example. When the user of the location information providing device 100 is in the vicinity of “DEF Chinese restaurant”, the location information providing device 100 receives the signal 560 emitted from the indoor transmitter installed in the DEF Chinese restaurant. The position information providing apparatus 100 acquires information indicating the position of the DEF Chinese restaurant from the IMES signal, and causes the display 950 to display a screen 1410. The display content is not limited to coordinate values, and may be the name of a store, the name of a commercial facility directory, or the like.

  After that, when the position information providing apparatus 100 acquires the channel number of the one-segment broadcasting from the received signal, the position information providing apparatus 100 selects the channel. When the position information providing apparatus 100 detects reception of the one-segment broadcasting, a screen 1420 indicating that fact is displayed on the display 950. The position information providing apparatus 100 receives the one-segment broadcasting from a signal transmitted from a transmitter installed in the vicinity of the DEF Chinese restaurant, and displays the video as a screen 1430.

  When the user of the location information providing apparatus 100 passes in front of the DEF Chinese restaurant and approaches an adjacent “GHI sushi” restaurant, the location information providing apparatus 100 starts from a transmitter installed in the vicinity of “GHI sushi”. The transmitted signal 560 is received. When the position information providing apparatus 100 acquires the position information from the signal 560, the position information providing apparatus 100 displays the current position of the position information providing apparatus 100 on the screen 1440. Thereafter, when the position information providing apparatus 100 acquires the channel number information from the signal 560, the position information providing apparatus 100 selects the channel and receives the one-segment broadcasting. Display 950 displays a screen 1450 indicating reception of the one-segment broadcasting. After that, the display 950 displays a video 1460 broadcasted by GHI sushi as a screen 1460.

  As a result, even when a plurality of indoor transmitters are installed, the position information providing apparatus 100 can detect the position information of the indoor transmitters and the indoor transmitters based on the signals received from the indoor transmitters. The one-segment broadcast video can be sequentially displayed by the installer. Thereby, the user of the location information providing apparatus 100 can accurately obtain information related to the store in front of the store.

<Second Modification>
With reference to FIG. 16, the modification of the positional information provision apparatus 100 is demonstrated. The position information providing apparatus 100 according to this modification is different from the position information providing apparatus 100 described above in that it has a function of selectively receiving one-seg broadcasting when receiving one-seg broadcasting while executing another application. . Note that the position information providing apparatus 100 according to the present modification is realized using the hardware configuration described above. Therefore, the description of the hardware configuration will not be repeated. The position information providing apparatus according to the present modification is realized by executing unique processing as software processing. In the following description, the configuration of the position information providing apparatus 100 is used.

  When the position information providing apparatus 100 according to this modification has a mail function, the display 950 displays a mail creation screen 1510, for example. Thereafter, when the user of the location information providing apparatus 100 reaches before the “XYZ shop” where the indoor transmitter that transmits the signal 560 is installed, the location information providing apparatus 100 receives the signal 560 and receives the signal 560 from the signal 560. Get channel number information and select the channel. The baseband processor 810 of the position information providing apparatus 100 causes the display 950 to display a screen 1520 for inquiring whether to save the mail and view the one-segment broadcasting. When the user of the position information providing apparatus 100 presses the icon 1522 and selects “Yes”, the display 950 displays a video advertising the time sale of the XYZ shop as a screen 1530. On the other hand, when the user presses icon 1524 and selects “No”, screen 1520 is erased and display 950 displays mail creation screen 1510 again.

  With such a configuration, the position information providing apparatus 100 according to the present modification can selectively switch the viewing of the one-segment broadcasting. Therefore, it is possible to prevent other applications from being lost while preventing the information provided by the one-segment broadcasting. Can be prevented to a minimum.

<Third Modification>
Hereinafter, a third modification of the present embodiment will be described. The position information providing apparatus 100 according to this modification has the function of controlling whether or not the channel selection of the one-segment broadcasting is forcibly performed according to the value of the auxiliary value included in the signal 560. Different from each position information providing device. Note that the position information providing apparatus according to the present modification is realized using a hardware configuration similar to the hardware configuration of the position information providing apparatus 100 described above. Therefore, the description of the hardware configuration will not be repeated. The position information providing apparatus according to the present modification is realized by executing software that implements unique processing.

  Thus, with reference to FIG. 17, a control structure of the position information providing apparatus according to the present modification will be described. FIG. 17 is a flowchart showing a part of processing executed by the position information providing apparatus. The same steps as those described above are denoted by the same step numbers. This process is the same as the process described above. Therefore, the description of the same process will not be repeated.

  In step S1180, baseband processor 810 determines whether or not automatic channel selection is enabled. This determination is made based on control data stored in the memory 820. This control data is input when the user of the position information providing apparatus 100 gives a setting for enabling / disabling automatic channel selection. When baseband processor 810 determines that automatic channel selection is valid (YES in step S1180), control is switched to step S1182. Otherwise (NO in step S1180), baseband processor 1180 switches control to step S1610.

  In step S1610, baseband processor 810 determines whether the importance of signal 560 is equal to or greater than a predetermined value. This determination is performed based on, for example, a comparison between the importance level included in the auxiliary value 650 and a preset specified value. When baseband processor 810 determines that the degree of importance is equal to or higher than the specified value (YES in step S1610), control is switched to step S1182. Otherwise (NO in step S1610), baseband processor 810 switches control to step S1190.

  In this way, even if automatic channel selection based on one-segment broadcasting is disabled, it is possible to forcibly select a channel according to the importance of the signal 560. For example, in the case of one-segment broadcasting having urgency such as notification of an earthquake or other natural disaster, the user of the position information providing apparatus can be forcibly notified.

  Therefore, with reference to FIG. 18, a display mode of the screen of the position information providing apparatus according to the present modification will be described. FIG. 18 is a diagram showing the transition of the screen on display 950. When the user of the position information providing apparatus 100 creates a mail, the display 950 displays a mail creation screen 1710. Thereafter, when a positioning signal is received when passing near a specific commercial facility, the position information of the commercial facility is acquired, and the channel number for viewing one-seg broadcasting is acquired from the signal. The position information providing apparatus causes the display 950 to display a screen 1720 that notifies the reception of the one-segment broadcasting.

  When the importance level of the signal is equal to or greater than a predetermined value, the position information providing apparatus receives the one-segment broadcasting of the channel number even when the automatic tuning setting of the one-segment broadcasting is invalid. For example, when an earthquake occurs, a text broadcast screen 1730 indicating that fact is displayed. This makes it possible to provide highly important information in a timely manner regardless of the setting by the user of the position information providing apparatus.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  INDUSTRIAL APPLICABILITY The present invention can be provided for a mobile phone or other terminal having a positioning function and a transmitter capable of transmitting a signal having a configuration similar to that of a positioning signal.

It is a figure showing the outline of a structure of the positional information provision system 10 which concerns on embodiment of this invention. It is a figure showing the outline of a structure of the transmission system 20 which concerns on embodiment of this invention. It is a block diagram showing the detail of the hardware constitutions of the indoor transmitter 200-1. It is a figure which represents notionally the one aspect | mode of data storage in EEPROM440 provided with the indoor transmitter 200-1. It is a figure showing the structure of the signal 500 transmitted by the transmitter mounted in a GPS satellite. FIG. 4 is a diagram showing an outline of an IMES signal 560. It is a block diagram showing the outline of the hardware constitutions of the 1 seg transmitter 700 which concerns on embodiment of this invention. It is a figure showing the outline of the hardware constitutions of the positional information provision apparatus 100-1 which concerns on embodiment of this invention. It is a block diagram showing the outline of the hardware constitutions of the positional information provision apparatus 100 which concerns on embodiment of this invention. It is a block diagram showing the hardware constitutions of the mobile telephone 900 which is an aspect of a positional information provision apparatus. It is a block diagram showing the outline of the hardware constitutions of the positional information provision apparatus 1000 which concerns on the modification of embodiment of this invention. It is a flowchart showing a part of a series of operations executed by mobile phone 900 functioning as a position information providing device. It is a figure showing the display of the screen in the display 950 of the positional information provision apparatus 100. FIG. It is a figure showing the change of the screen of the display 950 in the place which cannot receive the positioning signal emitted from the GPS satellite. It is a figure showing the other display mode of the display. It is a figure showing the display mode of the screen which concerns on another modification. It is a flowchart showing a part of process which the position information provision apparatus which concerns on another modification performs. It is a figure showing transition of a screen in display 950 of a position information providing device concerning other modifications.

Explanation of symbols

  10 position information providing system, 20 transmission system, 100-1, 100-2 position information providing apparatus, 110, 111, 112, 113 GPS satellite, 121, 122, 123, 124 transmitter, 130 building, 200, 200-1 , 200-2, 200-3, 200-4 indoor transmitter, 250 broadcast system, 201 audio / video data, 203, 206, 392, 702, 712, 722, 1010 antenna, 982 memory card.

Claims (20)

A position information providing system capable of providing position information using a first positioning signal that is a spread spectrum signal from a plurality of satellites,
With an indoor transmitter,
The indoor transmitter is
First storage means for storing position data for specifying a place where the indoor transmitter is installed, and channel number information of a digital broadcast wave;
Generating means for generating a second positioning signal having the position data and the channel number information as a spread spectrum signal;
Transmitting means for transmitting the spread spectrum signal,
The position information providing system further includes a position information providing device,
The position information providing device includes:
Broadcast signal receiving means for receiving digital broadcast waves;
Positioning signal receiving means for receiving a spread spectrum signal;
Obtaining means for obtaining the channel number information from the spread spectrum signal;
Channel selection control means for controlling channel selection by the broadcast signal receiving means based on the channel number information acquired by the acquisition means;
A position information providing system including output means for outputting information based on a digital broadcast wave of a channel selected by the channel selection control means. The acquisition means includes
A second code pattern for storing a first code pattern for the first positioning signal and a second code pattern for the second positioning signal that is different from the first code pattern and is different from the first code pattern. Storage means;
The position information providing system according to claim 1, further comprising: extraction means for extracting the channel number information from the second positioning signal based on the second code pattern.   The acquisition means performs processing for specifying a code pattern corresponding to a spread spectrum signal received by the positioning signal receiving means based on the first and second code patterns until the specified result is obtained. The position information providing system according to claim 2, further comprising specifying means for performing the first and second positioning signals. The position information providing device further includes a setting storage unit that stores a setting that defines a channel selection mode of the broadcast signal receiving unit,
The position information providing system according to any one of claims 1 to 3, wherein the channel selection control unit switches channel selection by the broadcast signal reception unit in accordance with the contents of the setting.   For the setting, it is effective to select a channel based on channel number information acquired from the second positioning signal, and to select a channel based on channel number information acquired from the second positioning signal. The position information providing system according to claim 4, further comprising: a setting that is invalid. The first storage means further stores the importance of the channel number information,
The generating means generates a second positioning signal further having the importance as a spread spectrum signal,
The position information providing system according to any one of claims 1 to 5, wherein the channel selection control unit of the position information providing device controls channel selection of the broadcast signal receiving unit according to the importance.   The position information providing system according to claim 6, wherein when the importance level exceeds a preset importance level, the channel selection control unit selects a channel based on the acquired channel number information.   The position information providing system according to any one of claims 1 to 7, wherein the indoor transmitter further includes a digital broadcast unit that transmits a digital broadcast wave on a channel specified by the channel number information. A position information providing apparatus capable of providing position information based on a first positioning signal that is a spread spectrum signal from a plurality of satellites and a second positioning signal that is a spread spectrum signal from a transmitter. The format of the first positioning signal and the format of the second positioning signal are the same,
Broadcast signal receiving means for receiving digital broadcast waves;
Positioning signal receiving means for receiving the first or second positioning signal, wherein the second positioning signal includes position data for specifying a location where the transmitter is installed, and the digital broadcast wave. Channel number information, and
Obtaining means for obtaining the channel number information from the second positioning signal;
Channel selection control means for controlling channel selection by the broadcast signal receiving means based on the channel number information acquired by the acquisition means;
A position information providing apparatus comprising: output means for outputting information based on a digital broadcast wave of a channel selected by the channel selection control means. The acquisition means includes
Storage means for storing a first code pattern for the first positioning signal, and a second code pattern for the second positioning signal that is a different code pattern from the first code pattern; ,
The position information providing apparatus according to claim 9, further comprising an extraction unit that extracts the channel number information from the second positioning signal based on the second code pattern.   The acquisition means performs processing for specifying a code pattern corresponding to a spread spectrum signal received by the positioning signal receiving means based on the first and second code patterns until the specified result is obtained. The position information providing apparatus according to claim 10, further comprising a specifying unit configured to perform the first and second positioning signals. A setting storage means for storing a setting for defining a channel selection mode of the broadcast signal receiving means;
The position information providing apparatus according to claim 10 or 11, wherein the channel selection control unit switches channel selection by the broadcast signal reception unit according to the content of the setting.   For the setting, it is effective to select a channel based on channel number information acquired from the second positioning signal, and to select a channel based on channel number information acquired from the second positioning signal. The position information providing apparatus according to claim 12, further comprising: a setting that is invalid. The second positioning signal includes importance of the channel number information,
The position information providing apparatus according to claim 9, wherein the channel selection control unit controls channel selection of the broadcast signal reception unit according to the importance.   The channel selection control unit causes the broadcast signal reception unit to perform channel selection based on the acquired channel number information when the importance level exceeds a preset importance level. Position information providing device. An indoor transmitter,
Storage means for storing position data for specifying a place where the indoor transmitter is installed, and channel number information of a digital broadcast wave;
Generating means for generating a message signal having the position data and the channel number information as a signal spread spectrum signal;
An indoor transmitter comprising transmission means for transmitting the spread spectrum signal.   The indoor transmitter according to claim 16, wherein the generation unit generates the message signal in the same format as a positioning signal transmitted from a positioning satellite.   The indoor transmitter according to claim 17, wherein a code pattern of the positioning signal is different from a code pattern of the message signal.   The indoor transmitter according to any one of claims 16 to 18, wherein the message signal includes control data for forcing channel selection based on the channel number information to a receiver of the message signal.   The indoor transmitter according to any one of claims 16 to 19, further comprising digital broadcasting means for transmitting a digital broadcast wave on a channel specified by the channel number information.

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