JP2006201151A - Positioning signal generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit a GPS signal to a location where GPS signals cannot be received. <P>SOLUTION: A GPS signal generating section 300, that the GPS signal generator has, includes an input section 310 for receiving the input of a signal transmitted from a CPU; a memory 400 for storing data required for controlling the operation of the GPS signal generating section 300 and data required for generating a GPS signal; a pseudo-signal generating section 330 for generating a pseudo GPS signal, based on the data that are input, in response to a command input via an input section 310 and data read from the memory 400; and an outputting section 340 for transmitting the GPS signal to a distributor 130. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for generating a signal. More specifically, the present invention relates to a positioning signal generator capable of transmitting a time-synchronized signal even in a place where the signal does not reach.

  Regarding the provision of an information communication service using a mobile phone or other mobile communication terminal, a code division multiple access (CDMA) method, for example, a synchronous CDMA method is used. This method has a problem that, when synchronization between spreading codes is not taken, the codes interfere with each other and communication becomes impossible. For example, in an environment in which receiving devices of a plurality of communication standards are used in a mixed manner, the information communication service may not be provided smoothly. An example of such a case includes a poor call on a mobile phone, a malfunction of application software, and the like. Therefore, even in the above environment, transmission of a synchronized signal is required.

  Also, regarding synchronization, GPS (Global Positioning System), which is well-known as a positioning system, is a communication device that receives a signal based on GPS signals transmitted by a plurality of GPS satellites capable of transmitting a signal including time information. This is realized by measuring the position. GPS is normally available in areas where GPS signals can be received, specifically on the ground, particularly where high-rise buildings do not block signal propagation. The GPS signal is generated and transmitted based on time data from an atomic clock that is synchronized with the master clock. Accordingly, when the terminal can receive the GPS signal, the terminal operates in accordance with the time information included in the GPS signal.

  On the other hand, with the development of subways, underground malls, etc., users who have GPS signal receiving terminals have increased opportunities to act in the same way as on the ground. However, since GPS signals are not propagated in an underground shopping mall or the like, a receiving apparatus having a positioning function cannot calculate the position of the apparatus.

  The GPS includes not only GPS operated by the United States of America, but also Galileo currently being studied in the European Union, GLONASS (Global Navigation Satellite System) operated by the Russian Republic, and other satellite navigation systems.

  By the way, with regard to telephone devices, with the spread of mobile phones, the number of fixed telephone devices installed in public areas is decreasing. Since the installation location of the fixed telephone device is specified in advance, it is possible to notify the transmission location at the time of emergency call such as 110th and 119th in Japan. On the other hand, there is a problem that a signal transmitted from a mobile phone or other mobile terminal cannot specify the transmission location. For this reason, for example, in the United States, as in the E (Enhanced) 911 regulations, a communication carrier is obliged to specify a place where an emergency call is sent from a mobile phone within a predetermined error range (for example, 300 m). This trend is expected to progress in other countries as well. As information for specifying a transmission place, use of position information calculated based on GPS as described above can be considered.

  In addition, although the prior art about this invention was demonstrated based on the general technical information which the applicant acquired, the information which should be disclosed as prior art document information before filing in the range which an applicant memorize | stores The applicant does not have

  However, as described above, since the GPS signal cannot be received when the user is in the underground shopping area, the user's terminal cannot transmit the location information based on the GPS signal together with the emergency call. There is a problem.

  In order to make it possible to receive GPS signals even underground, for example, a method of transmitting signals received on the ground to the underground via a cable can be considered. However, newly laying a cable in an area that has already been developed or has been completed cannot be easily realized because it requires construction work. There may also be places where it is substantially difficult to lay cables.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a positioning signal generator capable of transmitting a signal for specifying position information even in a place where radio waves do not reach. That is.

  Another object of the present invention is to provide a positioning signal generator capable of transmitting a signal synchronized in time.

  Another object of the present invention is to provide a positioning signal generator capable of transmitting a signal according to a use environment.

  Another object of the present invention is to provide a positioning signal generator capable of transmitting a positioning signal based on arbitrary position information.

  Still another object of the present invention is to provide a positioning signal generator capable of remote control.

  In order to solve the above-described problems, according to one aspect of the present invention, the positioning signal generator is installed in a place where radio waves from a satellite that transmits radio waves for positioning are not received. The positioning signal generator includes storage means for storing a navigation message prepared in advance and input means for receiving input of information from the outside. The information includes time information representing time. The positioning signal generator includes time measuring means for measuring time. The time measuring means can correct the time based on the time information. The positioning signal generating device encodes a navigation message and a time measured by the time measuring means by using each of a plurality of predetermined codes, thereby a plurality of positioning signals including data for positioning. Are provided. The data for positioning includes data included in radio waves from a satellite that transmits radio waves for positioning. The data included in the radio wave includes a navigation message. The positioning signal generator includes output means for outputting a plurality of positioning signals.

  According to another aspect of the present invention, the positioning signal generator includes storage means for storing a navigation message prepared in advance and input means for receiving input of information from the outside. The information includes time information representing time. The positioning signal generator includes time measuring means for measuring time. The time measuring means can correct the time based on the time information. The positioning signal generating device encodes a navigation message and a time measured by the time measuring means by using each of a plurality of predetermined codes, thereby a plurality of positioning signals including data for positioning. And generating means for generating the positioning signals and output means for outputting a plurality of positioning signals.

  According to said structure, a positioning signal generator outputs the positioning signal produced | generated based on time and a navigation message. As a result, since a terminal that receives such a signal can calculate a position based on the positioning signal, the terminal can specify the position even in a place where an actual positioning signal cannot be received. . In addition, since a synchronized signal is transmitted, it is possible to provide a service that complies with a communication standard that is assumed to be synchronized.

  Preferably, the data for positioning includes data included in radio waves from a satellite that transmits radio waves for positioning.

According to the above configuration, since the positioning signal having the data included in the radio wave transmitted by the satellite is transmitted, the terminal can operate in the same manner as when receiving a signal from the satellite. Therefore, even if the user of the terminal is in a place where the satellite radio waves cannot be received (for example, indoors or underground), the terminal can acquire the position information.

  Preferably, the data for positioning includes data included in radio waves from a satellite that transmits radio waves for positioning.

Preferably, the data included in the radio wave includes a navigation message.
According to the above configuration, since the positioning signal generator transmits a signal including a navigation message, a terminal that receives the signal can easily acquire position information.

  Preferably, the positioning signal generator is installed in a place where radio waves from a satellite that transmits radio waves for positioning are not received.

Preferably, the place where radio waves are not received is underground.
Preferably, the place where radio waves are not received is indoors.

  According to the above configuration, even if the terminal is present in a place where the satellite radio waves cannot be received (for example, underground, indoors, etc.), the terminal receives the radio waves transmitted from the positioning signal generator, so that the location information Can be calculated. Therefore, even when the terminal makes a call for an emergency call, for example, the call location can be notified.

  Preferably, an update means for updating data inside the positioning signal generator based on information input via the input means is further provided.

  According to the above configuration, it is possible to update the internal data in the positioning signal generation device, so that it is possible to maintain consistency with data held by another device (for example, a device that provides the information).

  Preferably, the input unit includes an acquisition unit that acquires time information from the information. The update means includes calibration means for calibrating the time of the time measuring means based on the acquired time information.

  According to said structure, since the deviation of the time of the time measuring means built in a positioning signal generator and the actual time can be corrected, the fall of precision can be prevented.

  Preferably, the acquisition unit acquires time information included in the GPS signal from a communication device that can acquire the GPS signal. The calibration means synchronizes the time of the time measuring means with the time of the GPS signal based on the time information included in the GPS signal.

  According to said structure, a positioning signal generator produces | generates and transmits the signal for positioning based on the time synchronized with the time contained in a GPS signal. Therefore, even in a place where an actual GPS signal cannot be received, the terminal can execute processing based on the time included in the GPS signal.

  Preferably, the information from the outside includes a navigation message. The input means includes acquisition means for acquiring a navigation message. The update means updates the navigation message stored in the storage means to the acquired navigation message.

  According to said structure, since the positioning signal generator can correct | amend a navigation message, it can maintain the precision of the signal transmitted.

  Preferably, the acquisition unit acquires a navigation message included in the GPS signal from information transmitted by a communication device that can acquire the GPS signal.

  According to said structure, a positioning signal generator transmits the signal containing the same message as the navigation message contained in a GPS signal. Therefore, a terminal that receives such a signal can operate in the same manner as when it receives an actual GPS signal.

  Preferably, the positioning signal generation device further includes a transmission unit that transmits an information transmission request to a communication device capable of transmitting information via a communication line. The input means includes receiving means for receiving information from the communication device.

  According to said structure, the positioning signal generator can update information by transmitting a transmission request as needed, for example.

  Preferably, the transmission means transmits a transmission request to the communication device at predetermined time intervals.

  According to said structure, since the positioning signal generator can update information regularly, it can maintain the precision of the signal transmitted.

  Preferably, the positioning signal generator further includes monitoring means for monitoring an operating state of the positioning signal generator based on a signal generated by the device itself.

  According to said structure, since the positioning signal generator can monitor its own state based on the signal which self produced | generated, it can implement | achieve abnormality detection rapidly, for example.

  Preferably, the signal includes a positioning signal generated by the generating means. The positioning signal generator further includes receiving means for receiving the positioning signal transmitted by the transmitting means. The monitoring means monitors the state of the positioning signal generator based on the positioning signal received by the receiving means.

  According to said structure, since the positioning signal generator can perform self diagnosis based on the positioning signal which self produced | generated, it can implement | achieve abnormality detection rapidly.

  Preferably, the positioning signal generation device further includes a detection unit that detects the occurrence of a failure based on the operating state, and an alarm unit that warns of an abnormality of the positioning signal generation device based on the detection of the occurrence of the failure.

  According to the above configuration, when a failure occurs in the positioning signal generator, a warning is issued, so that necessary measures can be taken quickly.

  Preferably, it further includes history acquisition means for acquiring failure information for representing a failure in response to detection of the occurrence of the failure, and recording means for recording the acquired failure information.

  According to the above configuration, since a history is recorded, for example, analysis based on past operation records can be realized.

  Preferably, the history acquisition unit acquires information indicating that the navigation message cannot be used as failure information.

  According to the above configuration, since it is detected that information necessary for positioning is not transmitted, it is possible to take necessary measures.

  Preferably, the positioning signal generator further includes strength changing means for changing the strength of the positioning signal output by the output means based on data input from the outside.

  Preferably, the strength changing means includes control data storage means for storing control data for controlling the strength of the positioning signal, and changing means for changing the strength based on the control data.

  Preferably, the intensity changing unit includes a detecting unit that detects the intensity of the positioning signal, and a changing unit that changes the intensity based on the intensity detected by the detecting unit.

  Preferably, the positioning signal generator further includes changing means for changing the navigation message based on data input from the outside.

  Preferably, the changing unit includes a position information input unit that receives input of position information prepared in advance, and a position information storage unit that stores the position information. The output means outputs the position information stored in the position information storage means as a positioning signal.

  Preferably, the positioning signal generator further includes control means for controlling the operation of the positioning signal generator based on data input from the outside.

  Preferably, the positioning signal generator further includes a communication unit that communicates with a control device that controls the positioning signal generator via a communication line. The control unit includes an acquisition unit that acquires control information that defines the operation of the positioning signal generation device from information transmitted by the control device, and a processing unit that executes a process according to the control information.

  According to the positioning signal generator according to the present invention, a plurality of positioning signals including data for positioning are generated and transmitted. A receiving device that can receive a positioning signal can calculate position information based on the data. That is, even in an area where an actual positioning signal cannot be received, the receiving device can acquire position information based on the signal transmitted by the positioning signal generator.

  According to the positioning signal generation device according to the present invention, since a time-synchronized signal is transmitted, even a terminal corresponding to each of a plurality of communication standards having different standards performs an operation based on the signal. Can be executed. Therefore, it is possible to prevent problems caused by time mismatch, for example, disconnection of a call when the terminal is a mobile phone, other problems, malfunction of an application program executed by the terminal, and the like.

  According to the positioning signal generator according to another aspect of the present invention, since the intensity of the transmitted signal can be changed based on the input data, a signal corresponding to the use environment of the apparatus can be transmitted.

  According to the positioning signal generator according to another aspect of the present invention, since a positioning signal based on arbitrary position information can be transmitted, position information different from the actual position can be provided.

  According to the positioning signal generator according to still another aspect of the present invention, data defining its own operation can be acquired via the communication line, so that control from a remote location can be realized.

  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.

<First Embodiment>
With reference to FIG. 1, the usage aspect of the GPS signal generator 800 which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a diagram showing a mode in which a GPS signal generator 800 is installed underground and is further connected to base stations 780 and 790. Base stations 780 and 790 include, for example, a communication device corresponding to a so-called 2.5 generation standard conforming to the CDMA system, a communication device corresponding to a third generation standard, and the like. The device corresponding to the third generation standard includes, for example, a device capable of data communication according to the EV-DO (Evolution-Data Only) specification, but the device may be a device complying with other specifications.

  As shown in FIG. 1, the GPS signal generator 800 is connected to a communication line 890. A time synchronization server 870 is connected to the communication line 890. The communication line 890 is realized by a telephone line, an Ethernet (registered trademark) LAN (Local Area Network), an optical communication line, a dedicated line, other information communication lines, and the like.

  The time synchronization server 870 is connected to the GPS receiver 860 via a communication network. The GPS receiver 860 receives the GPS signal transmitted from the GPS satellite 710 via the antenna 850. The GPS satellite 710 includes, for example, four GPS satellites 710-1, 710-2, 710-3, and 710-4.

  A GPS satellite 710 shown in FIG. 1 is a satellite that is generally used. Therefore, a terminal having a general reception function can also receive a GPS signal transmitted from each satellite. For example, the terminal 720 can directly receive a signal transmitted from each satellite via an antenna.

  Even when the terminal is indoors, the terminal can receive a GPS signal by using the relay device. For example, the terminal 730 can receive a GPS signal transmitted from the transmitter 700 via the relay device 740 connected to the antenna 850.

  With reference to FIG. 2, a communication system provided with GPS signal generation device 800 according to the present embodiment will be described. FIG. 2 is a diagram conceptually showing the hardware configuration of the GPS signal generator 800 and the configuration of the communication system.

  The GPS signal generator 800 is connected to the communication line 890 via the communication interface 820. The time synchronization server 870 is connected to the communication line 890 via the modem 812. The time synchronization server 870 receives input of time information from the GPS receiver 860. As described later, time synchronization server 870 establishes communication with GPS signal generation device 800 in response to the establishment of a predetermined communication condition. The time synchronization server 870 receives the time data transmission request from the GPS signal generation device 800 and transmits the time data to the GPS signal generation device 800 in response to the request. Here, the time data is data for correcting the clock time included in the GPS signal generation device 800. The communication for the correction is performed as follows, for example. In other words, the time synchronization server 870 calculates the time for transmitting the request when receiving the request from the GPS signal generator 800, and calculates the delay time in the communication line. The time synchronization server 870 generates time data that takes this delay time into account.

  A GPS receiver 860 is connected to the time synchronization server 870. The GPS receiver 860 receives a GPS signal via the antenna 850.

  Further, a remote monitoring device 880 for maintenance is connected to the communication line 890 via a modem 814. Note that the remote monitoring device 880 need not always be connected to the communication line 890. That is, the connection may be made periodically at predetermined time intervals, or may be connected as necessary. The remote monitoring device 880 is realized by, for example, a PC (Personal Computer) having a communication function.

  The GPS signal generator 800 includes a CPU (Central Processing Unit) 900, a memory 930, a modem 810, a GPS signal generator 300, a distributor 130, a GPS receiver 140, and transmitters 150, 152, 154. 156, a communication interface 820, a maintenance port 830, an LED (Light-Emitting Diode) 840, and a clock 842. For example, a base station 780 is connected to the transmitter 152. For example, a base station 790 is connected to the transmitter 154.

  CPU 900 includes a memory (not shown) for storing data prepared in advance and a processor (not shown) for executing a predetermined process. The CPU 900 controls the operation of other elements constituting the GPS signal generator 800. The CPU 900 receives a signal input from the GPS receiver 140 and executes a function of diagnosing the state of the GPS signal generator 800 as will be described later. For example, CPU 900 determines whether or not GPS signal generation unit 300 generates a GPS signal having a predetermined structure.

  The GPS signal generation unit 300 generates a GPS signal based on a signal sent from the CPU 900 and data stored in advance. This signal generally has the same configuration as a signal transmitted from a GPS satellite. The GPS signal generation unit 300 encodes data using a previously generated C / A (Coarse and Access) code to generate a GPS signal in a pseudo manner. The code for encoding is not limited to the C / A code, but may be a GOLD code or other codes.

  The distributor 130 distributes the signal transmitted from the GPS signal generation unit 300 and transmits the signal to the transmitters 150, 152, 154, and 156, respectively. Each transmitter is connected to a cable (not shown). Transmitters 150, 152, 154, and 156 transmit the pseudo GPS signal generated by GPS signal generation unit 300.

  The GPS receiver 140 is connected to the transmitter 156 via a cable. The GPS receiver 140 receives the GPS signal transmitted from the transmitter 156. The GPS receiver 140 executes a predetermined process based on the received signal, and outputs the result of the process to the CPU 900. Here, the predetermined process includes, for example, a process for calculating the position of the GPS signal generation device 800 based on position information included in the GPS signal. Note that the connection mode between the GPS receiver 140 and the transmitter 156 is not limited to a connection via a cable, and may be capable of wireless communication, for example.

  With reference to FIG. 3, a configuration of GPS signal generation section 300 according to the present embodiment will be described. FIG. 3 is a block diagram illustrating a functional configuration of the GPS signal generation unit 300.

  The GPS signal generation unit 300 includes an input unit 310, a memory 400, a pseudo signal generation unit 330, and an output unit 340. Input unit 310 receives an input of a signal sent from CPU 110. The memory 400 stores data necessary for controlling the operation of the GPS signal generator 300 or data necessary for processing of a pseudo signal generator 330 described later. The memory 400 may include, for example, any one or both of a nonvolatile memory and a volatile memory. Data stored in the memory 400 will be described later.

  The pseudo signal generation unit 330 generates a pseudo GPS signal based on the data transmitted from the clock 842 and the data read from the memory 400 in response to a command input via the input unit 310. . That is, the pseudo signal generation unit 330 generates data for a pseudo GPS signal based on the time information and the almanac information. The pseudo signal generation unit 330 further encodes data for the GPS signal using a C / A code generated in advance. The code used by the pseudo signal generation unit 330 is not limited to the C / A code, and may be other codes. The generated signal is output to the outside of the GPS signal generation unit 300 via the output unit 340. The output unit 340 is connected to the distributor 130 and transmits a GPS signal to the distributor 130.

  The GPS signal generation unit 300 is formed on one substrate as an integrated circuit, for example. Alternatively, the GPS signal generation unit 300 is realized by a memory storing a program and data for realizing each function and a CPU for executing each process described later based on the program and data. May be.

  The data structure of the GPS signal generation unit 300 will be described with reference to FIG. FIG. 4 is a diagram conceptually showing one mode of data storage in memory 400 provided in GPS signal generation unit 300.

  Memory 400 includes data areas 410 to 440 for storing data. Information on the position where the GPS signal generator 800 is installed is stored in the data area 410. Time information when the operation of the GPS signal generator 800 is started is stored in the data area 420.

  Data for the pseudo signal generation unit 330 to generate a pseudo GPS signal, that is, a pseudo navigation message is stored in the data area 430. The pseudo navigation message includes, for example, almanac data. Here, the pseudo GPS signal refers to a signal having a configuration similar to that of a GPS signal transmitted by a GPS satellite. The pseudo navigation message is data having the same configuration as the navigation message included in the actual GPS signal.

  The correction time data is stored in the area 440. The data includes timing for executing a preset correction process. The timing can be arbitrarily set, for example, at a predetermined time every day, every week, every month, or the like.

  With reference to FIG. 5, a signal output from GPS signal generation device 800 according to the present embodiment will be described. FIGS. 5A to 5D are diagrams conceptually showing the structure of a pseudo GPS signal generated by the GPS signal generation unit 300.

  When the GPS signal generation unit 300 executes a predetermined signal generation process, a signal having the same configuration as a signal transmitted by an actual GPS satellite is output. The signal is encoded by, for example, a C / A code. Each signal is synchronized in time.

  Each signal includes a C / A code and a navigation message. The navigation message includes, for example, almanac, but may include other information. For example, trajectory information, clock correction values, ionization value correction data, health data, and the like may be included. Note that the GPS signal generation device 800 according to the present embodiment is for sending a pseudo signal to a place where an actual GPS signal does not reach (for example, an underground shopping center or indoors). Therefore, the C / A code or the navigation message only needs to include at least items necessary for the operation of the GPS receiver.

  In addition, although the example shown by FIG. 5 represents the case where four signals are included, the number of the pseudo-generated signals is not limited to this. For example, three signals may be generated.

  With reference to FIG. 6, the control structure of GPS signal generation device 800 according to the present embodiment will be described. FIG. 6 is a flowchart showing a procedure of processing executed by pseudo signal generation unit 330.

  In step S610, pseudo signal generation unit 330 acquires time information from clock 842. The time of the clock 842 is adjusted to the reference time when the operation of the GPS signal generator 800 is started, for example, but correction during operation is also possible. For example, the signal generation by the GPS signal generator 800 may be temporarily stopped, and the time may be corrected during the stop. In step S620, pseudo signal generation unit 330 reads GPS signal data from memory 400.

  In step S630, pseudo signal generation unit 330 generates pseudo GPS signals for four satellites based on time information and GPS signal data. The generated signal has a structure as shown in FIG. 5, for example. That is, the pseudo signal generation unit 330 generates pseudo GPS signal data by encoding time information and almanac data with a C / A code. Each C / A code is preset for each of the four satellites, for example.

  In step S640, pseudo signal generation unit 330 outputs each pseudo GPS signal. Each signal is output to the outside of the signal generator 300 via the output unit 340. The pseudo GPS signal is distributed by the distributor 130 and transmitted by the transmitters 150, 152, 154 and 156. A signal transmitted from the transmitter 152 is input to the base station 780 in accordance with the CDMA system, for example.

  Next, with reference to FIG. 7, a configuration of CPU 900 that realizes GPS signal generation device 800 according to the present embodiment will be described. FIG. 7 is a block diagram showing a functional configuration of CPU 900. This function is realized when a preset program product is executed. The program product is input from the outside to the GPS signal generator 800 and stored in the memory 930, for example.

  The CPU 900 includes an input unit 902, a setting information storage unit 904, a GPS time acquisition unit 906, a time calibration unit 908, a command detection unit 910, a state monitoring unit 912, a failure detection unit 914, and a notification signal generation unit. 916, a log acquisition unit 918, a GPS signal confirmation unit 920, and an output unit 922 are included.

  The input unit 902 receives a signal input from the outside and transmits it to the inside. Here, the outside may be either outside the CPU 900 or outside the GPS signal generator 800. The setting information storage unit 904 stores data for controlling the operation of the GPS signal generator 800. This information includes, for example, data for identifying the GPS signal generator 800, a time at which communication processing via the communication line 890 is started, and the like.

  The GPS time acquisition unit 906 acquires GPS time information from a signal input from the outside via the communication interface 820. The time calibration unit 908 calibrates the internal time of the GPS signal generation device 800 based on the time information acquired by the GPS time acquisition unit 906.

  The command detection unit 910 detects a command for controlling the operation of the GPS signal generation device 800 based on a command input from the outside of the GPS signal generation device 800. When a specific command is detected, an operation corresponding to the command is realized. The command includes, for example, a command for reporting the status of the GPS signal generator 800, a command for starting communication processing for updating the internal time, and the like.

  The state monitoring unit 912 monitors the operating state of the GPS signal generation device 800 based on a signal input to the CPU 900. For example, it is monitored whether each element such as the GPS signal generation unit 300, the distributor 130, the transmitters 150, 152, 154, 156, the GPS receiver 140, the modem 810, etc. is operating normally. The monitoring is performed, for example, by comparing a signal output from each element with a signal to be output when the element operates normally. Alternatively, the state monitoring unit 912 determines the operation state of the GPS signal generation device 800 by sequentially determining whether or not the signal output from each element is a predetermined signal that is output in the event of an abnormality. Monitor. In addition, the state monitoring unit 912 outputs a signal indicating that the GPS signal generator 800 is operating normally or a signal indicating that the GPS signal generator 800 is not operating normally as a monitoring result.

  The failure detection unit 914 detects whether an abnormality has occurred in the GPS signal generator 800 based on the result of monitoring by the state monitoring unit 912. This detection is realized, for example, by storing a signal value output when each element operates normally in the setting information storage unit 904 in advance and comparing it with a signal value input sequentially. .

  The notification signal generator 916 generates a notification signal for notifying the operating state of the GPS signal generator 800. The state notified here includes whether or not the GPS signal generation unit 300 and other elements are operating normally, whether or not the GPS signal generation device 800 is performing time calibration, and the like.

  The log acquisition unit 918 acquires data for representing the operating state of the GPS signal generator 800. This data is a signal value obtained when the GPS signal generation device 800 is operating normally, more specifically, for example, whether the GPS signal generation unit 300 normally generates a pseudo GPS signal. Includes data indicating whether or not. The acquired data is stored in, for example, the memory 900 or other data storage means. Thereby, since the GPS signal generation device 800 stores a history of operation, it is possible to easily realize cause analysis when an abnormality occurs, remote monitoring of an operation status, and the like.

  Based on the signal received by the GPS receiver 140, the GPS signal confirmation unit 920 determines whether or not the signal pseudo-generated by the GPS signal generation unit 300 is normal. For example, when the received signal does not include a navigation message, or when the time information is clearly different from the original time, the GPS signal confirmation unit 920 determines whether the signal generated by the GPS signal generation unit 300 is Judged as an incorrect signal.

  The output unit 922 outputs a command for controlling the operation of the GPS signal generation unit 300 to the GPS signal generation unit 300. The command includes, for example, a command for temporarily interrupting the generation of the pseudo GPS signal, a command for terminating the interrupt and restarting the signal generation, and the like. In addition, when a port for outputting data is connected to the outside of the GPS signal generator 800, the output unit 922 sends data to the port.

  With reference to FIG. 8, the control structure of GPS signal generation device 800 according to the present embodiment will be described. FIG. 8 is a flowchart showing a procedure of processing executed by CPU 900. Similar to the control structure shown in FIG. 7, this processing is also realized by executing a program product stored in advance in the memory 930 or other storage means. In the following description, the process realized by the CPU is the same.

  In step S1010, CPU 900 of GPS signal generation device 800 detects the arrival of the calibration time. The detection is performed, for example, at predetermined time intervals or based on calibration instructions input from the outside. For example, when the update timing is set in advance, the arrival of that time becomes the arrival of the calibration time. Alternatively, when data indicating the next calibration time is received during communication for the previous calibration, the update date determined by the data received at that time is the update time. Information indicating the update time is also stored in the time synchronization server 870. Therefore, when the update process is not executed at that time, the time synchronization server 870 can detect that an abnormality has occurred in the GPS signal generator 800 or the communication line.

  In step S1020, CPU 900 starts a connection process to time synchronization server 870. For example, the CPU 900 outputs a signal for connection to the time synchronization server 870 via the modem 810 and the communication interface 820. The time synchronization server 870 performs processing for a predetermined connection in response to reception of a signal transmitted from the GPS signal generation device 800. The process includes an authentication process using an ID (Identification) for identifying the GPS signal generator 800 and a password, for example.

  In step S1030, in response to reception of the signal transmitted from time synchronization server 870, CPU 900 determines whether or not connection with time synchronization server 870 has been established based on the signal. If CPU 900 determines that the connection has been established (YES in step S1030), the process proceeds to step S1070. If not (NO in step S1030), the process proceeds to step S1040.

  In step S1040, CPU 900 executes a process for predetermined reconnection. For example, CPU 900 transmits a signal indicating a connection request to time synchronization server 870 again after a predetermined time after detecting that the connection has failed.

  In step S1050, CPU 900 determines whether or not connection with time synchronization server 870 has been established. This determination is performed, for example, in the same manner as the processing in step S1030. If CPU 900 determines that the connection has been established (YES in step S1050), the process proceeds to step S1070. If not (NO in step S1050), the process proceeds to step S1060.

  In step S1060, CPU 900 notifies that connection with time synchronization server 870 has failed. For example, CPU 900 transmits information indicating that the process for time synchronization has failed to remote monitoring device 880 connected to communication line 890. Alternatively, the CPU 900 sends a signal for notifying connection failure to the LED 840. The LED 840 turns on a predetermined indicator in response to such a signal. In this way, even when the execution of the predetermined time synchronization process fails, the failure is notified, so that the administrator of the GPS signal generator 800 can take necessary measures promptly.

  In step S1070, CPU 900 outputs a signal indicating a GPS time transmission request to time synchronization server 870. This signal includes, for example, a GPS time transmission destination, that is, a network address of the GPS signal generator 800, an output time of the request, etc. as data items.

  In step S1080, CPU 900 receives GPS time from time synchronization server 870. CPU 900 calculates a delay time in the transmission path in response to the reception of the GPS time. For example, an average value of the time required for signal transmission from the GPS signal generation device to time synchronization server 870 and the time required for signal transmission from time synchronization server 870 to GPS signal generation device 800 is used as the delay time. This delay time is used when correcting the time in the GPS signal generator 800. That is, the GPS signal generator 800 corrects the internal clock based on the GPS time reflecting the delay time. Note that the data transmitted from the time synchronization server 870 includes, for example, information indicating the next correction time, that is, the timing for transmitting the next GPS time, in addition to the GPS time. Therefore, even when the GPS signal generation device 800 and the time synchronization server 870 are not always connected, the GPS signal generation device 800 can execute processing for correcting the time based on the information. it can.

  In step S1090, CPU 900 calibrates the time of clock 842 based on the GPS time. Thereby, since the internal time of the GPS signal generator 800 is synchronized with the time actually transmitted from the GPS satellite, the GPS signal generator 800 can maintain the time accuracy.

  As described above, according to GPS signal generation device 800 according to the present embodiment, connection processing necessary for calibrating the internal time is executed, and acquisition of time information included in the actual GPS signal is started. . The GPS signal generator 800 calibrates the time of the built-in clock based on the time information. In this way, the GPS signal generation unit 300 can generate and transmit a pseudo GPS signal based on the same time information as the time information included in the signal actually transmitted from the GPS satellite. Therefore, since a terminal that exists in an area where an actual GPS signal cannot be received can also receive the actual time, application software that can be executed by the terminal can be executed accurately.

  Further, according to GPS signal generation device 800 according to the present embodiment, a receiver having a GPS function can perform the function even in an area where GPS signals transmitted from GPS satellites cannot be received (for example, indoors, underground, etc.). Can be executed. That is, a receiver present in the reception range of the area can acquire position information predetermined for the area by receiving the pseudo GPS signal. Therefore, when the user of the receiver transmits, the receiver can transmit information specifying the position of the receiver itself by including the position information in the transmission signal. As a result, for example, when an emergency call is made, the position of the caller can be notified in the same manner as a conventional emergency call using a fixed telephone whose position is specified in advance.

<First Modification>
Hereinafter, a first modification of the present embodiment will be described. The GPS signal generation device according to this modification is different from the GPS signal generation device according to the first embodiment in that it has a function of changing settings based on data input from the outside. The change in the setting includes, for example, a change in timing for calibrating the time, a change in timing for transmitting an operation history of a GPS signal generation device to be described later, a change in an item to be recorded as the operation history, and the like.

  Note that the hardware configuration of the GPS signal generation device according to this modification has the same configuration as that of the GPS signal generation device 800 shown in FIG. Their functions are the same. Therefore, description of the configuration will not be repeated here.

  With reference to FIG. 9, the control structure of the GPS signal generator according to the present modification will be described. FIG. 9 is a flowchart showing a procedure of processing executed by CPU 900.

  In step S1110, CPU 900 establishes a connection with remote monitoring device 880 connected to communication line 890. The establishment of this connection is realized in the same manner as the process performed between the GPS signal generation device 800 and the time synchronization server 870, for example, as described above (step S1020 in FIG. 8).

  In step S1120, CPU 900 receives an input of a start command for remote operation from remote monitoring device 880. When this command is input, the state of the GPS signal generator is set to a remotely settable state. That is, a command input from the outside can be received, and the system setting is changed to a valid state based on data included in the command.

  In step S1140, CPU 900 receives setting information from remote monitoring device 880. In step S1150, CPU 900 changes the setting of GPS signal generation device 800 based on the setting information. Data input for the change is stored in a nonvolatile manner in the memory of the GPS signal generator 800.

  In step S1160, CPU 900 notifies completion of the change. For example, CPU 900 generates and outputs information indicating that the designated setting change has been executed effectively to remote monitoring device 880. In step S1170, CPU 900 disconnects connection with remote monitoring device 880.

  As described above, the GPS signal generation device according to the present modification can change the setting of the operation conditions of the GPS signal generation device itself in accordance with an external access. This change includes a change in time at which a predetermined process such as internal time synchronization, history transmission, or pseudo GPS signal monitoring is executed, a change in information to be acquired as a history, and the like.

  This makes it possible to remotely control the conditions under which the GPS signal generator operates, thereby facilitating management of the GPS signal generator. For example, even in an environment where a plurality of GPS signal generators are used, collective management is possible.

  The flowchart shown in FIG. 9 shows the procedure of processing executed in response to the input of one command, but the same processing is executed when a plurality of commands are input. In this case, before the connection between the GPS signal generator and the remote device is cut off, it is confirmed whether or not the reception of the command is completed. If the reception has not been completed, input of the next command is awaited, and necessary command data communication is executed.

<Second Modification>
Hereinafter, a second modification of the present embodiment will be described. The GPS signal generation device according to this modification is different from the above-described embodiments in that it has a history recording function and a failure detection function. Here, the history includes both the case where the GPS signal generator 800 is operating normally and the case where an abnormality has occurred. Further, the history may be an operation history for each component of the GPS signal generator.

  Note that the hardware configuration of the GPS signal generation device according to this modification has the same configuration as that of the GPS signal generation device 800 shown in FIG. Their functions are the same. Therefore, description of the configuration will not be repeated here.

  With reference to FIG. 10, the control structure of the GPS signal generation device 800 according to this modification will be described. FIG. 10 is a flowchart showing a procedure of processing executed by CPU 900. This process is a process for monitoring the state of the GPS signal generator 800, and is continuously executed when the execution of the process is set to be valid.

  In step S1210, CPU 900 outputs a state notification signal transmission instruction to GPS signal generation unit 300. Here, the state notification signal refers to a signal including data for representing the operation state of the GPS signal generation unit 300.

  In step S1220, CPU 900 receives a status notification signal from GPS signal generation unit 300. In step S1230, CPU 900 acquires data representing the state of GPS signal generation unit 300 from the signal. This state includes a state where the GPS signal generation unit 300 is operating normally, a state where it is not operating, a state where the operation is unstable, and the like.

  In step S1240, CPU 900 determines whether a failure has occurred in GPS signal generation unit 300 or not. Here, the determination target is the GPS signal generation unit 300, but other components may be used. If CPU 900 determines that a failure has occurred in GPS signal generation unit 300 (YES in step S1240), the process proceeds to step S1250. If not (NO in step S1240), the process proceeds to step S1280.

  In step S1250, CPU 900 obtains a log when a failure occurs. Items included in the acquired log will be described later. In step S1260, CPU 900 stores the acquired log in memory 930. This storage mode will be described later.

  In step S1270, CPU 900 generates a signal for notifying the occurrence of a failure. This signal includes the date and time of occurrence of the failure, an error code determined in advance to identify the failure, and the like.

  In step S1280, CPU 900 generates a signal for notifying that GPS signal generation unit 300 is operating normally. Since the default state is generally normal, the process in step S1280 may not be executed. In this case, that is, if NO in step S1240, the process proceeds to step S1290 or ends.

  In step S1290, CPU 900 transmits the generated signal. When the GPS signal generator 800 is connected to the communication line 890, the operation information is notified to the remote monitoring device 880 connected to the communication line 890. More specifically, for example, when the GPS signal generation device 800 is always connected to the communication line 890, the operation information is reported every predetermined time or when a failure occurs. Alternatively, if communication between the GPS signal generator 800 and the communication line 890 is not established, communication is established at predetermined time intervals or in response to the occurrence of a failure, and then operation information is reported. Is done.

  Here, with reference to FIG. 11, the data structure of the GPS signal generator 800 according to the present modification will be described. FIG. 11 is a diagram conceptually showing a mode of data storage in memory 930 included in GPS signal generation device 800.

  Memory 930 includes areas 1310 to 1350 in which data is stored. Data for representing the error code is stored in area 1310. Data for representing the state of the GPS signal generator 300 is stored in area 1320. Data for representing the attribute of the error code is stored in area 1322. Here, the attribute is a priority for notifying an abnormality corresponding to an error code, for example, but is not limited thereto. If the detected error is low in importance, the priority is set as data representing “low”. In this case, the occurrence of the error is not immediately notified. Thus, by classifying the types of errors hierarchically, it is possible to quickly distinguish between errors that should be dealt with and errors that are not.

  Data acquired by monitoring the operating state of the GPS signal generator 300 is sequentially generated and stored sequentially. For example, a log number for specifying the generated log is stored in area 1330. The time data when the log is acquired is stored in the area 1340. An error code for indicating a failure whose occurrence has been detected is stored in area 1350. The code stored in the area 1350 is data prepared in advance and stored in the area 1310.

  Here, for example, the data record R1370 of the log number “001” is generated at 17:00 on November 11, 2004. That is, the GPS signal generator 300 records that a failure occurred on that day. The state detected at this time is recorded as an error code “E001”. Data record R1370 indicates that the GPS signal generation unit 300 did not output a pseudo GPS signal that should be output.

  Note that the manner of storing master data for recording the history of GPS signal generation device 800 and data representing the history is not limited to the manner shown in FIG.

  As described above, the GPS signal generation device 800 according to the present modification sequentially monitors the operating state of the GPS signal generation unit 300 and detects the occurrence of a failure. When the occurrence of a failure is detected, the occurrence time and state are associated with each other and stored in the memory 930 or other internal storage means. In this way, since the record of the operation of the GPS signal generator 800 can be obtained sequentially, even if the GPS signal generator 800 is monitored from a remote location, measures necessary for countermeasures against the fault are taken. Can be taken easily.

<Third Modification>
Hereinafter, a third modification of the present embodiment will be described. The GPS signal generation device according to this modification is different from the above-described devices in that it has a function of determining its own operating state based on a signal transmitted by itself. That is, the GPS signal generation device according to the present modification receives a pseudo GPS signal transmitted by the GPS signal generation unit 300 and detects the presence or absence of its own abnormality based on the reception result.

  Note that the hardware configuration of the GPS signal generation device according to this modification has the same configuration as that of the GPS signal generation device 800 shown in FIG. Their functions are the same. Therefore, description of the configuration will not be repeated here.

  With reference to FIG. 12, the control structure of the GPS signal generator according to the present modification will be described. FIG. 12 is a flowchart showing a procedure of processing executed by GPS signal generation device 800. This processing may be executed, for example, every preset time, or may be executed continuously while the GPS signal generator is operating.

  In step S1410, GPS receiver 140 receives the pseudo GPS signal transmitted from transmitter 156. The received signal is sent to the CPU 900. In step S1420, CPU 900 calculates the position information of the GPS signal generation device based on the signal from GPS receiver 140.

  In step S1430, CPU 900 determines whether or not a pseudo GPS signal is normally generated based on the calculated position information and the position information stored in the memory in advance. If CPU 900 determines that the signal is normally generated (YES in step S1430), the process ends. If not (NO in step S1430), the process proceeds to step 1440.

  In step S1440, CPU 900 generates notification data for notifying abnormality of GPS signal generation unit 300. In step S1450, CPU 900 outputs the notification data. For example, the CPU 900 notifies the abnormality of the GPS signal generation unit 300 by sending it to the outside of the GPS signal generation device 800 via the communication interface 820 or to the LED 840.

  As described above, the GPS signal generation device according to the present modification uses the GPS signal generated by itself to determine whether or not the signal is generated accurately. Therefore, the GPS signal generation device can confirm whether or not it is operating normally without waiting for an external diagnosis. Therefore, the occurrence of abnormality can be detected promptly.

  Here, with reference to FIG. 13, the alerting | reporting aspect of the GPS signal generator which concerns on this modification is demonstrated. FIG. 13 is a diagram illustrating an aspect of the indicator in LED 840.

  LED 840 includes indicators 1510-1530. Indicator 1510 notifies that the GPS signal generator is operating normally when it is lit. Indicator 1520, when it is lit, notifies that the GPS signal generator is ready for operation. Indicator 1530 notifies that the GPS signal generator is calibrating the internal time when it is lit.

  Thus, by sending a signal according to the detected state to the predetermined indicator, the GPS signal generating device can easily notify its operating state to the outside. Therefore, even when the GPS signal generator is attached to the ceiling of the basement, for example, the administrator can easily recognize whether or not the device is operating normally. Maintenance inspections are also carried out promptly.

  As described above in detail, the GPS signal generation device according to the present invention generates and transmits a GPS signal based on the time based on the clock incorporated in the device. This signal has the same configuration as the GPS signal transmitted from a plurality of (for example, four) GPS satellites in operation, and includes the same information. As a result, a pseudo GPS signal with synchronized time is transmitted in the range where the transmission signal from the GPS signal generator arrives. Therefore, reception with a GPS signal receiving function is performed in that range. Since the apparatus can operate based on the synchronized signal, it is possible to prevent the reception apparatus from causing interference, interruption of communication, and other problems.

  In each of the above-described embodiments and modifications thereof, the GPS signal generation unit 300 is realized in hardware like a combination of circuits that can execute a function for generating a pseudo GPS signal. Although described as a thing, you may implement | achieve by another aspect. For example, you may implement | achieve by making a control program which implement | achieves the process which produces | generates a pseudo | simulation GPS signal to CPU and other arithmetic devices. In this case, the control program may be stored in advance in the memory 930 in an executable format, and the CPU may execute a process of generating a pseudo signal based on the control program.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The GPS signal generation device 1400 according to the present embodiment is different from the GPS signal generation device 800 according to the first embodiment in that it has a function of directly transmitting a signal to a mobile device.

  With reference to FIG. 14, a usage mode of GPS signal generation device 1400 according to the present embodiment will be described. FIG. 14 is a diagram illustrating a state where GPS signal generation device 1400 is installed in the basement and transmits a signal. Antennas 1410 and 1420 are connected to the GPS signal generator 1400. The GPS signal generator 1400 transmits a signal via the antennas 1410 and 1420. The signals are represented by “PRN1”, “PRN2”, “PRN3”, and “PRN4”, for example. The signal is received by, for example, mobile phones 200 and 210 which are one mode of the mobile device. Note that the signal transmitted from the GPS signal generator 1400 is not limited to four signals (that is, signals for four satellites). For example, three signals may be used.

  When the mobile phones 200 and 210 are within the communication range of the GPS signal generator 1400, the mobile phones 200 and 210 can receive the synchronized signals generated by the GPS signal generator 1400, respectively. . The mobile phones 200 and 210 operate based on the signal.

  The GPS signal generation device 1400 is connected to the time synchronization server 870 as in the first embodiment, and can calibrate the internal time. The time synchronization server 870 receives GPS signals from a GPS receiver 860 that can receive signals from the GPS satellites 710-1 to 710-4. Therefore, the GPS signal generator 1400 can correct the internal information (for example, time, almanac, etc.) based on the actual GPS signal.

  With reference to FIG. 15, the configuration of GPS signal generation device 1400 will be described. FIG. 15 is a block diagram showing a hardware configuration of GPS signal generation device 1400.

  The GPS signal generation device 1400 includes a CPU 110, a transmitter 150, a clock 850, and a GPS signal generation unit 300. The transmitter 150 wirelessly transmits the signal transmitted from the GPS signal generation unit 300. The GPS signal generation unit 300 has the same configuration as that shown in FIG. Therefore, the description thereof will not be repeated here.

  As described above, the GPS signal generation device 1400 according to the present embodiment can generate and transmit a synchronized signal for the mobile device, and the mobile device is based on the signal. Can operate normally.

<Third Embodiment>
Hereinafter, a third embodiment of the present invention will be described. The GPS signal generator 800 described above receives time information input via the time synchronization server 870 connected via a communication line, and corrects the time based on the information. However, when the time accuracy of the GPS signal generator is not required, the GPS signal generator may be used without being connected to the communication line. In other words, in an environment where the difference between the time of the GPS signal generator and the actual time based on the GPS signal is allowed, the GPS signal generator can be used alone.

  With reference to FIG. 16, the usage aspect of the GPS signal generator 1600 which concerns on the 3rd Embodiment of this invention is demonstrated. FIG. 16 is a diagram illustrating a state in which the GPS signal generation device 1600 is attached to the ceiling of the underground mall.

  The GPS signal generator 1600 is attached in a state where a GPS signal can be transmitted within a predetermined range. The antennas 160 and 170 are connected to the GPS signal generator 1600. When the mobile phones 200 and 210 capable of receiving GPS signals are within the GPS signal receivable range, the signals can be received and processing for calculating predetermined position information can be executed. . Note that the number of antennas connected to the GPS signal generator 1600 is not particularly limited.

  PRN1 to PRN4 represent pseudo GPS signals generated by the GPS signal generator 1600, respectively. Each signal corresponds to a GPS signal transmitted by a GPS satellite. That is, PRN1 to 4 include the same information as the information included in the signal from the GPS satellite. The same information is generated based on data stored in the GPS signal generator 1600, as will be described later.

  In this way, the GPS signal generation device 1600 can be used in places other than where GPS signals cannot be received in advance, such as underground or indoor. For example, you may install in the place (for example, a place where the weather is unstable, a mountainous part, etc.) where the reception condition of the radio wave from the GPS satellite fluctuates even outdoors. In this case, even if the receiver cannot receive radio waves from GPS satellites due to bad weather or the like, the receiver calculates position information using a pseudo GPS signal transmitted by the GPS signal generator 1600. Can do. For this reason, the location information of the caller can be notified when an emergency call is sent even outdoors.

<Fourth embodiment>
Hereinafter, a fourth embodiment of the present invention will be described. The positioning signal generation device according to the present embodiment is different from the devices according to the respective embodiments described above in that it has a function of changing the intensity of a radio signal.

  With reference to FIG. 17, a configuration of GPS signal generation device 1700 according to the present embodiment will be described. FIG. 17 is a block diagram showing a hardware configuration of GPS signal generation device 1700.

  The GPS signal generator 1700 includes a CPU 1710 that realizes a function of changing the intensity of the signal. CPU 1710 includes an intensity changing unit 1720 for changing the intensity of the GPS signal based on the data stored in memory 930.

  The intensity changing unit 1720 is realized by the CPU 1710 executing a program that realizes a process of changing the intensity. This program is stored in the memory 930 or other non-volatile storage device. Alternatively, instead of such a software aspect, it may be realized in hardware using a circuit element that executes the processing.

  With reference to FIG. 18, the data structure of GPS signal generation device 1700 according to the present embodiment will be described. FIG. 18 is a diagram showing how data is stored for changing the signal strength in memory 930. Memory 930 includes areas 1810 to 1830 for storing data.

  Data representing the type of set value is stored in area 1810. The type of the set value indicates whether the set value is preset as an initial value or is changed based on data input by the user. Data for defining the signal strength is stored in area 1820. This data is referenced by the CPU 1710 and used to determine the strength of the transmitted signal. A validity flag indicating whether or not the data is valid is stored in area 1830. When this flag is set to valid (for example, ON), the CPU 1710 refers to the setting value associated with the flag. On the other hand, when the flag is set to invalid (for example, OFF), the value is not used.

  By associating such a flag with each setting value, even when a plurality of data is stored in the memory 930, the signal strength can be arbitrarily set based on any one of the data. it can. The example shown in FIG. 18 indicates that data (“input value”) input by the user of the apparatus is used as data for defining the signal strength. In this case, since the initial value is stored without being erased, for example, when a data reset instruction is input by the user, the initial value is used again.

  With reference to FIG. 19, a control structure of GPS signal generation device 1700 according to the present embodiment will be described. FIG. 19 is a flowchart showing a procedure of processes executed by CPU 1710 and GPS signal generation unit 300 in order to change the signal strength.

  In step S1910, CPU 1710 receives input of data for changing the strength of the signal. This data is input from the outside via the modem 810, for example. This data is stored in the memory 930 (FIG. 18).

  In step S 1920, CPU 1710 sends a command to change the intensity based on the data to GPS signal generation unit 300. More specifically, the CPU 1710 refers to the flag in the area 1830 in the memory 930 and reads a value for which the flag is valid. CPU 1710 generates a command to change the signal intensity using the data. CPU 1710 transmits the command to GPS signal generation unit 300.

  In step S1930, upon receiving the command input, GPS signal generation unit 300 stores the data in a predetermined area in built-in memory 400. The GPS signal generation unit 300 thereafter refers to the data, generates a signal having an intensity defined by the data, and sends the signal to the distributor 130.

  As described above, the GPS signal generation device 1700 according to the present embodiment can change the signal strength according to the data input by the user of the device. In this way, the GPS signal generator 1700 can output a signal having an intensity corresponding to the environment actually used. For example, when the GPS signal generation device is installed in an underground shopping center, the administrator of the device can set the strength to such an extent that radio waves can be received in the underground shopping street. Thereby, acquisition of position information by the owner of the signal receiving apparatus can be reliably realized.

  In the present embodiment, a case has been described in which a change in signal strength is realized by a user of positioning signal generating apparatus 1700 inputting data defining the strength. Instead, the intensity of the transmitted signal may be detected, and the intensity may be changed according to the detection result. For example, when the detected intensity falls below a predetermined threshold, the GPS signal generation unit 300 may increase the output of the signal so that a signal having at least the intensity of the threshold is transmitted. This eliminates the need for the user to perform an operation for changing the strength every time. As a result, the convenience of the positioning signal generator 1700 can be improved.

<Fifth embodiment>
The fifth embodiment of the present invention will be described below. The positioning signal generator according to the present embodiment has the function of including position information that is different from the position information included in the navigation message in the signal for positioning, and the apparatus according to each of the above embodiments. Different. That is, a positioning signal can be generated based on information other than information included in a signal transmitted from an actual satellite.

  Referring to FIG. 20, GPS signal generation device 2000 according to the present embodiment includes a CPU 2010 that realizes a function for acquiring position information, and an input panel 2040 for receiving data input from the outside. The input panel 2040 includes, for example, a touch panel numeric keypad and a liquid crystal display device capable of displaying input numerical values, characters, symbols, and the like.

  The CPU 2010 has a position information acquisition unit 2020 for acquiring position information from information input via the input panel 2040 or the modem 810, and position information acquired by the position information acquisition unit 2020 is predetermined in the memory 930. And a writing unit 2030 for storing in the area.

  The position information acquisition unit 2020 and the writing unit 2030 are realized by the CPU 2010 executing a program for realizing each process. Or it is realizable also as hardware using the circuit element which performs each process.

  With reference to FIG. 21, the data structure of GPS signal generation apparatus 2000 according to the present embodiment will be described. FIG. 21 is a diagram illustrating an aspect of storing location information in memory 930. Memory 930 includes areas 2110-2130 reserved in advance for storing location information.

  Data representing latitude is stored in area 2110. Data representing longitude is stored in area 2120. Data representing the altitude is stored in area 2130. The data stored in the areas 2110 to 2130 may be actual position information, or position information that is valid only in a specific location (for example, the location of an underground shopping center or the location of a booth in an exhibition hall). Good. The position information can be expressed as, for example, two-dimensional coordinates.

  When information indicating a position at a specific location is stored, a signal for positioning is generated based on the data. Thereby, even if the device can receive a specific signal transmitted at the location, the location information of the location can be provided to the user of the device. Specifically, for example, the position can be guided using a dedicated receiving device for an exhibition.

  With reference to FIG. 22, a control structure of GPS signal generation device 2000 according to the present embodiment will be described. FIG. 22 is a flowchart showing a procedure of processes executed by CPU 2010 and GPS signal generation unit 300 for realizing change of setting of position information.

  In step S2210, CPU 2010 receives an instruction to execute a mode for setting position information. This mode includes, for example, a mode in which position information is set from a signal actually transmitted by a GPS satellite, or a mode in which position information is generated based on data artificially input from the outside, as will be described later. Hereinafter, a case will be described in which the position information is set based on data input from the outside in this mode.

  In step S2220, CPU 2010 obtains position information input via input panel 2040. In step S2230, CPU 2010 stores the position information in an area secured in advance in memory 930 to store the position information (FIG. 21). In step S2240, CPU 2010 transmits the position information to GPS signal generation unit 300.

  In step S2250, GPS signal generation unit 300 stores the position information in area 410 of memory 400. An area 410 is an area referred to when a navigation message is created. By this storage, data input by the user is used as position information.

  In step S2260, GPS signal generation unit 300 generates a signal for positioning based on the position information. The signal generated in this way has other position information created in advance in place of the information received from the actual satellite.

  As described above, the GPS signal generation device 2000 according to the present embodiment generates a signal for positioning using the input position information without using the information included in the navigation message, and outputs the signal. Send. In this way, the receiver of the signal can be notified of the position other than the GPS receiving device and other known positioning signal receiving devices. Thereby, for example, the location information for the user can be simply provided at the venue of the exposition or at a specific place.

<Sixth Embodiment>
The sixth embodiment of the present invention will be described below. The positioning signal generation device according to the present embodiment is different from the devices according to the above-described embodiments in that remote control is possible.

  With reference to FIG. 23, a configuration of GPS signal generation device 2300 according to the present embodiment will be described. FIG. 23 is a block diagram showing a hardware configuration of GPS signal generation device 2300.

  The GPS signal generation device 2300 includes a CPU 2310 that realizes processing for defining the operation of the device itself based on an externally input signal. The CPU 2310 receives a reset instruction detection unit 2320 that detects an instruction to reset internal information from data input through an input / output interface (not shown), and specific data stored in the memory 930 based on the instruction. And an initialization unit 2330 for initialization.

  Here, for the sake of simplicity of explanation, resetting of internal data will be described as an example of remote control, but specific processing of remote control includes processing other than reset. For example, a process for changing the intensity of the signal, a process for changing position information stored in advance, and the like may be included.

  With reference to FIG. 24, data transmitted to remotely control GPS signal generation device 2300 according to the present embodiment will be described. FIG. 24 is a diagram showing a schematic configuration of control data 2400 transmitted from remote monitoring device 880 to GPS signal generation measure 2300. The control data 2400 includes a header 2410, a data body 2420, and a frame check sequence (FCS) 2430.

  Header 2410 includes, for example, a transmission source, a transmission destination, a data type (in this embodiment, data representing a reset of position information), and the like. The data body 2420 includes data to be remotely controlled, for example, position information to be newly stored and used. When this position information is taken in by the GPS signal generator 2300, it is stored in an area reserved in advance in the memory 930, for example, areas 2110 to 2130 in FIG.

  The control data 2400 is transmitted by a remote monitoring device 880 having a data generation function and a transmission function. The remote monitoring device 880 is realized by a computer system having a known configuration, for example. The hardware configuration of the computer system, its operation or communication processing can be easily understood by those skilled in the art. Therefore, description thereof will not be repeated here.

  With reference to FIG. 25, a control structure of GPS signal generation device 2300 according to the present embodiment will be described. FIG. 25 is a flowchart showing the procedure of processing executed by CPU 2310.

  In step S2510, CPU 2310 forms a communication session with remote monitoring device 880 based on an instruction input from the outside for remote control. The formation of the communication session is started based on a request for starting communication by the remote monitoring device 880, for example. Alternatively, when a predetermined communication start condition is satisfied in the GPS signal generation device 2300, the session may be started. In this case, the communication start condition is, for example, the arrival of a time set in advance to form a communication session periodically.

  In step S2520, CPU 2310 detects reception of a reset signal based on a signal input via modem 810. In step S2530, CPU 2310 determines whether or not reset data has been input. This determination is realized, for example, by detecting whether or not the data item to be reset is included in the data shown in FIG. If reset data has been input (YES in step S2530), the process proceeds to step S2540. If not (NO in step S2530), the process proceeds to step S2550.

  In step S2540, CPU 2310 stores the reset data (area 2420) included in the received signal in a predetermined area in memory 930 (FIG. 21).

  In step S2550, CPU 2310 saves data stored in advance in memory 930 as initial value data in another area that is referred to for arithmetic processing. Thereby, the GPS signal generation device 2300 whose internal data has been changed is initialized, and for example, the state at the time of shipment of the national situation or installation of the device can be recovered.

  In step S2560, CPU 2310 ends the communication session formed with remote monitoring device 880. When CPU 2310 detects that all processes to be executed have been completed, CPU 2310 performs data communication with remote monitoring device 880 to end the communication session. As a result, the session ends, and the GPS signal generator 2300 can operate independently.

  In step S 2570, CPU 2310 sends the data stored in memory 930 to GPS signal generation unit 300. The GPS signal generation unit 300 stores the data in a predetermined area in the memory 400. As a result, when the GPS signal generation device 2300 executes signal transmission processing thereafter, a signal is generated based on the data after being reset.

  As described above, GPS signal generation device 2300 according to the present embodiment communicates with remote monitoring device 880 having a data communication function, thereby changing operating conditions, changing usage data, and other internal data. Perform rewriting of This communication is realized by a LAN or other dedicated line or a general line such as the Internet. In this way, the user of the GPS signal generation device 2300 can operate the GPS signal generation device without directly operating the device. For example, the operation mode of the GPS signal generator can be changed frequently. As a result, the GPS signal generating device can be set according to the place where it is used, and the availability of the device can be expanded. In addition, since it is not necessary for the manager of the device to visit the device, the load on the user can be reduced.

  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.

It is a figure showing the state by which the GPS signal generator which concerns on the 1st Embodiment of this invention is attached to the ceiling of an underground mall. 1 is a diagram conceptually showing a hardware configuration of a GPS signal generation device and a system configuration including the device. FIG. It is a block diagram showing the functional structure of a GPS signal generation part. It is a figure which represents notionally the one aspect | mode of the storage of the data in the memory with which a GPS signal generation part is provided. It is a figure which represents notionally the structure of the pseudo GPS signal produced | generated by the GPS signal production | generation part. It is a flowchart showing the procedure of the process which a pseudo signal generation part performs. It is a block diagram showing the functional structure of CPU which implement | achieves a GPS signal generator. It is a flowchart (the 1) showing the procedure of the process which CPU of a GPS signal generator performs. It is a flowchart (the 2) showing the procedure of the process which CPU of a GPS signal generator performs. It is a flowchart (the 3) showing the procedure of the process which CPU of a GPS signal generator performs. It is a figure which represents notionally the aspect of the storage of the data in the memory with which the GPS signal generator which concerns on the 1st Embodiment of this invention is provided. It is a flowchart (the 4) showing the procedure of the process which CPU of a GPS signal generator performs. It is a figure showing the one aspect | mode of alerting | reporting of the GPS signal generator which concerns on the 1st Embodiment of this invention. It is a figure showing the state by which the GPS signal generator which concerns on the 2nd Embodiment of this invention is attached to the ceiling of an underground mall. It is a block diagram showing the hardware constitutions of the GPS signal generator which concerns on the 2nd Embodiment of this invention. It is a figure showing the usage condition of the GPS signal generator which concerns on the 3rd Embodiment of this invention. It is a block diagram showing the hardware constitutions of the GPS signal generator 1700 which concerns on the 4th Embodiment of this invention. It is a figure showing the aspect of the storage of the data for changing the signal strength in the memory 930 of the GPS signal generator 1700. It is a flowchart showing the procedure of the process which CPU1710 and the GPS signal generation part 300 perform in order to change signal strength. It is a block diagram showing the hardware constitutions of the GPS signal generator 2000 which concerns on the 5th Embodiment of this invention. It is a figure showing the mode of storage of the positional information in the memory 930 of the GPS signal generator 2000. 5 is a flowchart showing a procedure of processes executed by CPU 2010 and GPS signal generation unit 300. It is a block diagram showing the hardware constitutions of the GPS signal generator 2300 which concerns on the 6th Embodiment of this invention. It is a figure showing the structure of the control data 2400 transmitted with respect to the GPS signal generation | occurrence | production measure 2300 from the remote monitoring apparatus 880. FIG. 18 is a flowchart illustrating a procedure of processing executed by CPU 2310.

Explanation of symbols

  100, 800, 1700, 2000, 2300 GPS signal generator, 110, 900, 1710, 2010, 2310 CPU, 130 distributor, 140 GPS receiver, 150, 152, 154, 156 transmitter, 160, 170 antenna, 200 , 210 mobile phone, 300 GPS signal generator, 310 input unit, 320 clock, 330 pseudo signal generator, 340, 922 output unit, 400, 930 memory, 700 transmitter, 710, 710-1, 710-2, 710 -3, 710-4 GPS satellite, 720 terminal, 740 relay device, 812, 814 modem, 820 communication interface, 830 maintenance port, 840 LED, 850 antenna, 860 GPS receiver, 870 time synchronization server, 880 remote monitoring device 89 Communication line, 902 input unit, 904 setting information storage unit, 906 GPS time acquisition unit, 908 time calibration unit, 910 command detection unit, 912 state monitoring unit, 914 failure detection unit, 916 notification signal generation unit, 918 log acquisition unit, 920 GPS signal confirmation unit, 1720 intensity change unit, 2020 position information acquisition unit, 2030 writing unit, 2040 input panel, 2320 reset instruction detection unit, 2330 initialization unit.

Claims (26)

A positioning signal generator installed in a place where the radio wave from a satellite that transmits radio waves for positioning is not received,
Storage means for storing navigation messages prepared in advance;
Input means for receiving input of information from the outside, the information includes time information representing time,
A time measuring means for measuring time, the time measuring means is capable of correcting the time based on the time information;
A plurality of positioning signals including positioning data are generated by encoding the navigation message and the time measured by the time measuring means using each of a plurality of predetermined codes. The data for positioning includes data included in the radio wave from a satellite that transmits radio waves for positioning, and the data included in the radio wave includes a navigation message.
A positioning signal generator comprising output means for outputting the plurality of positioning signals. Storage means for storing navigation messages prepared in advance;
Input means for receiving input of information from the outside, the information includes time information representing time,
A time measuring means for measuring time, the time measuring means is capable of correcting the time based on the time information;
A plurality of positioning signals including positioning data are generated by encoding the navigation message and the time measured by the time measuring means using each of a plurality of predetermined codes. Generating means;
A positioning signal generator comprising output means for outputting the plurality of positioning signals.   The positioning signal generator according to claim 2, wherein the positioning data includes data included in the radio wave from a satellite that transmits a radio wave for positioning.   The positioning signal generator according to claim 3, wherein the data included in the radio wave includes a navigation message.   The positioning signal generator according to claim 2, wherein the positioning signal generator is installed in a place where the radio waves from a satellite that transmits radio waves for positioning are not received.   The positioning signal generator according to claim 5, wherein the place where the radio waves are not received is underground.   The positioning signal generator according to claim 5, wherein the place where the radio waves are not received is indoors.   The positioning signal generator according to claim 2, further comprising updating means for updating data inside the positioning signal generator based on information input via the input means. The input means includes acquisition means for acquiring the time information from the information,
9. The positioning signal generator according to claim 8, wherein the updating unit includes a calibration unit that calibrates the time of the time measuring unit based on the acquired time information. The acquisition means acquires time information included in the GPS signal from a communication device capable of acquiring a GPS (Global Positioning System) signal,
The positioning signal generator according to claim 9, wherein the calibration unit synchronizes the time of the time measuring unit with the time of the GPS signal based on time information included in the GPS signal. The external information includes a navigation message,
The input means includes acquisition means for acquiring the navigation message,
The positioning signal generating apparatus according to claim 9, wherein the updating means updates a navigation message stored in the storage means to the acquired navigation message.   The positioning signal generation device according to claim 11, wherein the acquisition unit acquires a navigation message included in the GPS signal from information transmitted by a communication device capable of acquiring a GPS signal. Further comprising a transmission means for transmitting a transmission request for the information to a communication device capable of transmitting the information via a communication line;
The positioning signal generation device according to claim 9, wherein the input unit includes a reception unit that receives the information from the communication device.   The positioning signal generation device according to claim 13, wherein the transmission unit transmits the transmission request to the communication device every predetermined time.   The positioning signal generator according to claim 2, further comprising monitoring means for monitoring an operating state of the positioning signal generator based on a signal generated by the positioning signal generator itself. The signal includes a positioning signal generated by the generating means,
The positioning signal generator further comprises receiving means for receiving the positioning signal transmitted by the transmitting means,
The positioning signal generator according to claim 15, wherein the monitoring unit monitors a state of the positioning signal generator based on a positioning signal received by the receiving unit. Detecting means for detecting the occurrence of a failure based on the operating state;
16. The positioning signal generator according to claim 15, further comprising alarm means for warning an abnormality of the positioning signal generator based on detection of the occurrence of the failure. History acquisition means for acquiring failure information for representing the failure in response to detection of the occurrence of the failure;
The positioning signal generator according to claim 17, further comprising recording means for recording the acquired failure information.   The positioning signal generation device according to claim 18, wherein the history acquisition means acquires information indicating that the navigation message cannot be used as the failure information.   The positioning signal generator according to claim 2, further comprising an intensity changing unit that changes the intensity of the positioning signal output by the output unit based on data input from outside. The strength changing means includes
Control data storage means for storing control data for controlling the intensity of the positioning signal;
The positioning signal generator according to claim 20, further comprising changing means for changing the intensity based on the control data. The strength changing means includes
Detecting means for detecting the intensity of the positioning signal;
The positioning signal generator according to claim 20, further comprising a changing unit that changes the intensity based on the intensity detected by the detecting unit.   The positioning signal generator according to claim 2, further comprising changing means for changing the navigation message based on data inputted from outside. The changing means is
Position information input means for receiving input of position information prepared in advance;
Position information storage means for storing the position information,
The positioning signal generator according to claim 23, wherein the output means outputs position information stored in the position information storage means as the positioning signal.   The positioning signal generator according to claim 2, further comprising control means for controlling the operation of the positioning signal generator based on data input from the outside. The positioning signal generator further includes a communication unit that communicates with a control device that controls the positioning signal generator via a communication line.
The control means includes
Obtaining means for obtaining control information defining the operation of the positioning signal generating device from the information transmitted by the control device;
The positioning signal generator according to claim 25, further comprising processing means for executing processing according to the control information.

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