JP2006064428A - Measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a system, in the system for measuring a position and a time of a vehicle. <P>SOLUTION: The vehicle is attached with a transmitter 1, and transmits a query radio wave including a prescribed frequency of unmodulated wave. A radio tag 2 set in a prescribed position conducts modulation by own inherent radio tag ID in response to the query radio wave to conduct transmission as a response radio wave. A leakage cable or split line 3 installed in the vicinity of the radio tag transmits a reception data of the response radio wave received from the radio tag, a reception system 4 demodulates the modulated wave included in the reception data to acquire the radio tag ID, and specifies the position of the vehicle, based on the position of the radio tag. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a system for measuring the position and time of a moving body, and to a technique for simplifying the system configuration.

  FIG. 23 is a diagram illustrating an outline of a position measurement system according to the related art. Conventionally, when a wireless tag (RFID tag: Radio Frequency Identification tag) is used in a system that measures the position and time of a mobile body, the wireless tag ID 1002 of the wireless tag embedded in the floor or wall is used as a reader / writer on the mobile body side. The position of the moving body is notified to the receiving system 1005 side by reading in 1001 and transmitting the data from the wireless device 1003 on the moving body side to the receiving system 1005 via the wireless LAN or the like via the wireless LAN.

However, such a measurement system has the following problems.
-If there are multiple mobile objects in the same wireless tag area, the reader / writer may interfere.
-Since the number of channels (number of lines) of the wireless device is limited, the position of many mobile units cannot be grasped simultaneously.
-There are many mounting parts (reader / writer, wireless device, etc.) on the moving body side, and furthermore, power consumption related to these is large, and a power source with a large capacity is required.
JP-A-11-224400 JP 2004005467 A

  The present invention has been made in order to eliminate the above-described drawbacks of the prior art, and the object thereof is related to a measurement system for measuring the position and time of a moving body, and a wireless tag installed at a predetermined position. By receiving data from a wireless tag via a leaking cable or strip line provided near the mobile terminal, the wireless device on the mobile unit side is unnecessary, and the system configuration is simplified.

A measurement system for measuring the position of a mobile body equipped with a transmitter for transmitting interrogation radio waves including unmodulated waves, the measurement system having the following elements (1) installed at a predetermined position, A plurality of wireless tags that receive the interrogation radio wave from the transmitter, modulate the unmodulated wave included in the interrogation radio wave with its own radio tag ID, and transmit the response radio wave including the modulated wave (2) Response radio wave receiving cable that is installed in a range that can receive response radio waves from multiple radio tags and that transmits response radio wave reception data received from radio tags (3) Connected to response radio wave reception cables for receiving response radio waves When the received data is input from the cable, the wireless tag ID is obtained by demodulating the modulated wave included in the received data, the position of the wireless tag is specified by the obtained wireless tag ID, and the position is Receiving system for determining the position of a mobile body Zui.

  In the present invention, in the system for measuring the position and time of the moving body, the system configuration can be reduced, and in particular, the apparatus on the moving body side can be reduced in weight. In addition, the distance between the moving body and the receiving system can be increased by using a leaky cable that has a smaller attenuation than that of spatial propagation.

Embodiment 1 FIG.
Hereinafter, the present invention will be described based on embodiments shown in the drawings. FIG. 1 is a diagram showing an outline of the position measurement system according to the first embodiment. The position measurement system according to the present invention includes a transmitter 1, a wireless tag 2, a leakage cable or strip line 3, and a reception system 4.

  The transmitter 1 is mounted on a moving body and configured to transmit radio waves having a predetermined frequency. The mobile body can be identified by the frequency assigned to the transmitter and by the transmission signal obtained by modulating data (ID number, command, etc.) from the transmitter. In this embodiment, an example of identification based on the frequency assigned to the transmitter will be described later.

  On the runway side, a group of wireless tags 2 is installed at a predetermined position such as a floor or a wall, and a leakage cable or strip line 3 is installed so as to pass near the wireless tags. The positional relationship in which the wireless tag 2 group is installed is normally assumed to be a constant interval, but it is not always necessary if the position of the wireless tag 2 can be grasped. In addition, it is not necessary to install a wireless tag and a leakage cable (or stripline) separately, and the wireless tag is affixed to the leakage cable (or stripline) directly or indirectly via a holding body. The cable (or line) may be installed on the floor or wall. As a work procedure, a wireless tag may be installed at a planned position, or the position may be measured after the wireless tag is installed.

  The receiving system 4 includes a receiver 5 and a tracking device 6. The receiver 5 is connected to the leakage cable or the strip line 3 and is configured to input received data and output measurement data. The receiving system 4 is configured to track the position of the moving body according to the measurement data. In this example, the receiver 5 and the tracking device 6 are separated, but they may be configured as a single unit.

  An outline of the operation will be described. The transmitter 1 transmits a radio wave having a frequency at which the wireless tag 2 operates to the wireless tag 2, and the wireless tag 2 modulates with its own wireless tag ID accordingly and transmits a modulated wave. This is received by the leaking cable or strip line 3, and the received signal is transmitted to the receiver 5. The receiver 5 demodulates the received signal and identifies the wireless tag ID. Further, the transmitter ID is identified by the tracking device 6, and the position of the transmitter is determined according to the wireless tag installation map (corresponding to the wireless tag table in this embodiment).

  FIG. 2 is a diagram illustrating signal states according to the first embodiment. In the present embodiment, different transmission frequencies are assigned in advance for each transmitter 1, and each transmitter 1 continuously transmits an unmodulated wave at an individual frequency assigned thereto. 201 of FIG. 2 has shown the state of unmodulated wave continuous transmission.

  When the wireless tag 2 receives the unmodulated wave from the transmitter 1, it modulates with its wireless tag ID and transmits it. In FIG. 2, as the transmitter A moves, the wireless tag (ID: No. 19) and the wireless tag (ID: No. 20) sequentially transmit radio waves with the modulation portion added (202, 203). ). Therefore, the receiver 5 inputs the signal level indicated by 204. In this embodiment, the transmitter is identified by frequency as will be described later.

  Next, the configuration and operation of each device will be described in detail.

  First, the transmitter 1 will be described. FIG. 3 is a diagram illustrating the configuration of the transmitter. The transmitter 1 includes an oscillator 301, a control circuit 302, a transmission circuit 303, and a transmission antenna 304. The oscillator 301 outputs a clock signal, the control circuit 302 controls the transmission circuit 303, and causes the transmission circuit 303 to generate a carrier signal having a preset frequency based on the clock signal. The transmission antenna 304 transmits this carrier signal as a radio wave. This unmodulated wave becomes the interrogation radio wave.

  In the present embodiment, the control circuit 302 instructs the transmission circuit 303 to generate a carrier signal having a frequency assigned to the transmitter, and further controls the transmission circuit 303 to maintain the transmission state by the generation. Yes.

  Next, the wireless tag 2 will be described. FIG. 4 is a diagram illustrating a configuration of the wireless tag. The wireless tag 2 includes a transmission / reception antenna 401, a reception circuit 402, a rectification circuit 403, a control circuit 404, a memory 405, and a transmission circuit 406. When the interrogation radio wave is received by the transmission / reception antenna 401 and the reception circuit 402 detects the carrier signal, the reception circuit 402 generates a clock signal. The rectifier circuit 403 rectifies the received interrogation radio wave and converts it into electric power. The control circuit 404 starts operation when power is supplied. When the clock signal is input, the wireless tag ID stored in the memory 405 is read. The transmission circuit 406 modulates the radio tag ID using the interrogation radio wave received by the transmission / reception antenna 401 as a carrier signal. The transmitting / receiving antenna 401 transmits this modulated wave as a radio wave. This modulated wave becomes a response radio wave.

  As the leaky cable, for example, a leaky coaxial cable for mobile radio is used, which has functions of an antenna and a cable. Similarly, the stripline can have the functions of an antenna and a cable. Accordingly, the leakage cable or strip line 3 can receive the response radio wave and transmit the received data. Leakage cables and strip lines are examples of response radio wave reception cables that are installed in a range (near the area) where response radio waves from a plurality of radio tags can be received and transmit reception data of response radio waves received from radio tags.

  FIG. 5 is a diagram illustrating a configuration of the receiver. The receiver 5 includes a receiving circuit 501, a timer 502, and an interface 503. The reception circuit 501 inputs the reception data received by the leaking cable or the strip line 3, passes through an internal band pass filter, and demodulates the reception data. Thereby, the wireless tag ID can be acquired. The receiving circuit 501 also specifies the frequency. The interface 503 acquires the time from the timer and sets it as the measurement time. The wireless tag ID, frequency, and measurement time are output as measurement data to the tracking device 6.

  FIG. 6 is a diagram illustrating a module configuration of the tracking device according to the first embodiment. The tracking device 6 includes a measurement data input unit 601, a position determination unit 602, a wireless tag table 603, a transmitter determination unit 604, a transmitter table 605, a tracking processing unit 606, and a tracking data storage unit 607.

  FIG. 7 is a diagram illustrating a processing flow of the tracking device according to the first embodiment. In the measurement data input process (S701) by the measurement data input unit 601, measurement data is input from the receiver 5. In this embodiment, the wireless tag ID, frequency, and measurement time are acquired as measurement data. In the position determination process (S702) by the position determination unit 602, the wireless tag table 603 is used to specify the installation position of the wireless tag corresponding to the wireless tag ID.

  FIG. 8 is a diagram illustrating an example of a wireless tag table. The wireless tag table 603 has a record for each wireless tag, and stores a wireless tag ID and a wireless tag installation position in association with each other. The wireless tag installation position may be information that can specify the position, such as absolute coordinates such as latitude and longitude, relative coordinates from the reference point, or azimuth and distance from the reference point.

  The position determination unit 602 searches for a record having a wireless tag ID that matches the wireless tag ID included in the measurement data, and acquires the wireless tag installation position of the record. And a measurement position is specified based on this wireless tag installation position, and it outputs. In addition to the method of handling the wireless tag installation position as it is as the measurement position, when the range that can be received by the wireless tag is wide, the method that uses the area close to the direction in which the moving object approaches as the measurement position Is also possible.

  In the transmitter determination process (S703) by the transmitter determination unit 604, the transmitter ID corresponding to the frequency is specified using the transmitter table 605.

  FIG. 9 is a diagram illustrating an example of a transmitter table. The transmitter table 605 has a record for each transmitter, and stores a transmitter ID and a frequency in association with each other.

  The transmitter determination unit 604 searches for a record having a frequency corresponding to the frequency included in the measurement data, and acquires the transmitter ID of the record. And this transmitter ID is output.

  In the tracking process (S704) by the tracking processing unit 606, for each measurement data, a combination of a transmitter ID, a measurement position, and a measurement time is input, and a process of tracking a series of movements of the transmitter is performed. At that time, a process of estimating a destination based on the tracking data stored in the tracking data storage unit 607, a process of adding the specified measurement position or the like as tracking data to the tracking data storage unit 607, and the like are stored. Do.

  As described above, in the measurement system according to the present embodiment, data from the wireless tag is received via the leaked cable or strip line provided near the wireless tag, and the received data is transmitted to the receiving system. This eliminates the need for the wireless device and reduces the weight of the mobile device.

Embodiment 2. FIG.
In Embodiment 1, unmodulated waves are continuously transmitted from the transmitter 1, but in this embodiment, an embodiment in which unmodulated waves are intermittently transmitted from the transmitter 1 will be described. The transmitter is identified by the frequency as in the first embodiment.

  FIG. 10 is a diagram illustrating signal states according to the second embodiment. As indicated by 1001, an unmodulated wave having a predetermined frequency is repeatedly sent out while providing a stop interval. As in the first embodiment, when the wireless tag 2 detects a carrier signal, it modulates with its own wireless tag ID and transmits a modulated wave (1002, 1003). As a result, the receiver 5 inputs a signal level as indicated by 1004.

  The transmitter 1 has the configuration shown in FIG. 3 as in the first embodiment, and the control circuit 302 instructs the transmission circuit 303 to generate a carrier signal having a frequency allocated to the transmitter. The transmission circuit 303 is controlled so as to repeat a transmission state due to generation and a stop state in which the generation is interrupted. The sending state is usually a constant interval. When the stop state is also controlled so as to be maintained at a constant interval, intermittent transmission is performed at a constant interval. When the stop state is controlled so as to maintain only a random interval that is not constant, transmission is performed at a random interval. In the case of random interval transmission, it is advantageous in that it is possible to avoid a situation in which collisions are repeated even when interrogation radio waves from a plurality of transmitters cause communication collisions.

  The wireless tag 2, the leakage cable or strip line 3, the receiving system 4, and the receiver 5 have the same configuration as in the first embodiment and perform the same operation.

Embodiment 3 FIG.
In the first and second embodiments, the mode in which the transmitter 1 is identified by the frequency assigned to each transmitter 1 has been described. However, in the third and fourth embodiments, the transmitter 1 assigns its own transmitter ID. A form to be modulated and included in the inquiry radio wave will be described. Since the transmitter ID is specified from the modulated part of the transmitter ID, identification of the transmitter by frequency is not necessary. That is, it is not necessary to use a different frequency for each transmitter 1, and a common frequency may be used for each transmitter 1.

  FIG. 11 is a diagram illustrating an outline of the position measurement system according to the third embodiment. The transmitter 1 transmits a part of the interrogation radio wave having the frequency f including a modulated wave obtained by modulating its own transmitter ID. The wireless tag 2 modulates the unmodulated wave portion of the interrogation radio wave with its own wireless tag ID and sends it out as a modulated wave. The receiver 5 demodulates the input received data and acquires a transmitter ID and a wireless tag ID.

  FIG. 12 is a diagram illustrating signal states according to the third embodiment. FIG. 13 is a diagram illustrating details of signals according to the third embodiment. The upper part of FIG. 13 is the interrogation radio wave, and as shown in the figure, the front part (T1) of the interrogation radio wave is an unmodulated wave, and the rear part (T2) is a modulated wave modulated by the transmitter ID. The lower part of FIG. 13 is a response radio wave, and as shown in the figure, the front part of the response radio wave is modulated by the wireless tag ID to become a modulated wave. (T3).

  As described above, the interrogation radio wave and the response radio wave are configured to transfer a signal as shown in FIG. When a communication collision occurs, the data related to the collision is not processed. Therefore, in order to prevent communication collision, transmission from the transmitter is intermittently performed at regular intervals or random intervals as in the second embodiment.

  For the transmitter 1, as in the third embodiment, the control circuit 302 shown in FIG. 3 instructs the transmission circuit 303 to generate a carrier signal having a predetermined frequency (generally a frequency common to each transmitter 1). The transmission circuit 303 is controlled to repeat the transmission state and the stop state. Further, in the rear part (T2) of the transmission state, the transmission circuit 303 reads out a transmitter ID stored in advance from a memory (not shown in FIG. 3) included in the transmitter 1, and this transmitter ID The control circuit 302 controls the transmission circuit 303 so as to modulate the signal.

  The wireless tag 2 has the same configuration as that of the above-described embodiment. Therefore, when the carrier signal is detected, the signal is modulated by the wireless tag ID to become a modulated wave portion (T3), but the modulated wave portion (T2) of the transmitter ID is transmitted as it is (T5).

  The receiver 5 has the configuration shown in FIG. 5, and the receiving circuit 501 demodulates the received data, acquires the wireless tag ID from the front modulated wave portion (T3), and transmits it from the rear modulated wave portion (T5). Get the machine ID. The interface 503 obtains the time from the timer, sets the measurement time, and outputs the wireless tag ID, the transmitter ID, and the measurement time to the tracking device 6 as measurement data.

  FIG. 14 is a diagram illustrating a module configuration of the tracking device according to the third embodiment. FIG. 15 is a diagram illustrating a processing flow of the tracking device according to the third embodiment. In the tracking device 6, the transmitter ID is included as the measurement data instead of the frequency, so that the transmitter determination process by the transmitter determination unit 604 is unnecessary. The tracking processing unit 606 performs tracking processing (S1503) using the transmitter ID included in the measurement data.

Embodiment 4 FIG.
Similarly to the third embodiment, a mode in which the transmitter 1 modulates with its own transmitter ID and is included in the interrogation radio wave will be described. However, unlike Embodiment 3, the modulated wave of the transmitter ID is composed of the transmitter ID and a command, and is provided in the front part of the interrogation radio wave. Unlike the above-described embodiment, the wireless tag performs modulation with its own wireless tag ID when a command is detected from the modulated wave included in the interrogation radio wave.

  FIG. 16 is a diagram illustrating signal states according to the fourth embodiment. FIG. 17 is a diagram illustrating details of signals according to the fourth embodiment. The upper part of FIG. 17 shows the interrogation radio wave. As shown in the figure, the front part (T6) of the interrogation radio wave is a modulated wave modulated by the transmitter ID and the command, and the rear part (T7) is unmodulated. Become a wave. This command is a command for instructing the wireless tag 2 to transmit a modulated wave modulated by its own wireless tag ID. The lower part of FIG. 17 shows response radio waves, and as shown in the figure, the rear part of the response radio waves is modulated by the wireless tag ID to become a modulated wave (T10).

  In this way, the interrogation radio wave and the response radio wave are configured to obtain a signal state as shown in FIG. When a communication collision occurs, the data related to the collision is not processed. Therefore, in order to prevent a communication collision, transmission from the transmitter is intermittently performed at regular intervals or random intervals as in the second and third embodiments.

  As with the third and fourth embodiments, the transmitter 1 generates a carrier signal having a predetermined frequency (generally a frequency common to each transmitter 1) from the control circuit 302 shown in FIG. The transmission circuit 303 is controlled to repeat the transmission state and the stop state. Further, in the front part (T6) of the transmission state, the transmission circuit 303 reads out a transmitter ID stored in advance from a memory (not shown in FIG. 3) included in the transmitter 1, and this transmitter ID The control circuit 302 controls the transmission circuit 303 so as to modulate with the above-described command.

  The wireless tag 2 of the present embodiment modulates with the wireless tag ID not at the time of detecting the carrier signal but at the time of detecting the above command. Therefore, it has the configuration shown in FIG. 4 as in the previous embodiment, but the operation is different. The interrogation radio wave is received by the transmission / reception antenna 401, and the rectification circuit 403 rectifies the received interrogation radio wave and converts it into electric power. When the reception circuit 402 detects the reception signal, the reception circuit 402 generates a clock signal based on the carrier signal. Also, the received signal is demodulated. When the control circuit 404 detects a command from the demodulated result, the control circuit 404 reads the RFID tag ID stored in the memory 405. The transmission circuit 406 modulates with the wireless tag ID using the interrogation radio wave received by the transmission / reception antenna 401 as a carrier signal. The transmitting / receiving antenna 401 transmits this modulated wave as a radio wave. The received interrogation radio wave is transmitted as it is without being modulated until the modulation wave portion of the interrogation radio wave is completed.

  As a result, as shown in FIG. 17, the modulated wave portion (T6) of the transmitter ID is transmitted as it is (T8), but the unmodulated wave portion (T7) is modulated by the wireless tag ID ( T10).

  The receiver 5 has the configuration of FIG. 5, the reception circuit 501 demodulates the received data, acquires the transmitter ID from the front modulation wave portion (T8), and wirelessly from the subsequent modulation wave portion (T10). Get the tag ID. The interface 503 obtains the time from the timer, sets the measurement time, and outputs the wireless tag ID, the transmitter ID, and the measurement time to the tracking device 6 as measurement data.

  The tracking device 6 has the same configuration as that of the third embodiment and operates in the same manner.

Embodiment 5. FIG.
In the fifth to seventh embodiments, an example of the arrangement of the wireless tag 2 and the leakage cable or stripline 3 is shown. FIG. 18 is a diagram illustrating a first arrangement example of a wireless tag and a leakage cable (strip line). In athletics, speed skating, bicycle racing, and the like, it is effective to arrange the wireless tag 2 and the leakage cable or strip line 3 along the traveling course as shown in the figure. In the case of a competition in which the runner can freely change the run line, the change of the line can also be grasped.

Embodiment 6 FIG.
FIG. 19 is a diagram illustrating a second arrangement example of the wireless tag and the leakage cable (strip line). This can be applied to the location of vehicles and luggage in parking lots, warehouses, factories, etc.

Embodiment 7 FIG.
As described above, in addition to being installed along the traveling direction, it can also be installed perpendicular to the traveling direction.

  FIG. 20 is a diagram illustrating a third arrangement example of the wireless tag and the leakage cable (strip line). In this example, a two-dimensional area is covered with a single cable by continuously arranging the keys.

Embodiment 8 FIG.
In the present invention, the distance between the moving body and the receiving system can be increased based on the embodiment described above as compared with the prior art. The extent to which the communication distance can be extended between the mobile unit and the receiving system as compared with the prior art will be examined with reference to FIGS. 21 and 24. FIG.

First, circuit design is performed for the conventional technology. FIG. 24 is a diagram illustrating a line according to the related art. The meaning of each code is as follows.
Ptx: Reader / writer transmission output Prx: Reader / writer reception input Pi: Tag reception input Po: Tag reflection output Grw: Reader / writer antenna gain Gtag: Tag antenna gain D: Tag / reader / writer distance PLtag: In-tag power loss Mtag: Tag Modulation degree The spatial attenuation α is expressed by the following equation.
α = 20 × log (λ / 4πD)
The tag reception level Pi is expressed by the following equation.
Pi = Ptx + Grw + α + Gtag
The tag transmission level Po is expressed by the following equation.
Po = Pi−PLtag + 20 × log (Mtag)
The receiver reception level is expressed by the following equation.
Prx = Po + Gtag + α + Grw
Therefore,
Prx = Ptx−PLtag + 20 × log (Mtag) + 2 × (Grw + α + Gtag)
It becomes.

  On the other hand, the line design according to the present invention is performed. FIG. 21 is a diagram showing a line according to the present invention. The spatial attenuation α, the tag reception level Pi, and the tag transmission level Po are the same as those in the prior art.

The receiver reception level Prx is expressed by the following equation.
Prx = Po + Gtag + β + γ
Therefore,
Prx = Ptx−PLtag + 20 × log (Mtag) + 2 × Gtag + Grw + α + β + γ
It becomes.

The communication distance between the prior art and the present invention will be compared using a general 900 MHz RFID RFID tag as an example. The maximum communication distance between the reader / writer (in the present invention, a transmitter) and the wireless tag is assumed to be about 5 m. The spatial attenuation α is 45.5 dB. Therefore, assuming that the reader / writer antenna gain is 2 dB, Grw + α = −43.5 dB
It becomes.

  Next, the communication distance is calculated. In the case of the prior art, the distance at which the moving body can be grasped by the receiving system is determined by the wireless system and performance between the wireless device of the receiving system and the wireless device on the moving body side. About 100 m, and about 100 m for communication between PHS slave units. Therefore, the communication distance between the wireless tag and the receiving system is about 105 m (5 m between the wireless tag and the moving body + 100 m between the moving body and the receiving system).

  On the other hand, assuming that the communication distance between the transmitter on the mobile unit and the leakage cable via the wireless tag is about 5 m as described above, the communication distance of the present invention is between the wireless tag and the leakage cable when the wireless tag is closely attached. When the coupling loss is −30 dB (experimental value) and the leakage cable attenuation is −6 dB / 100 m (general value) and converted to have the same gain as Grw + α, the communication distance is 230 m (mobile 5m between wireless tags + 225m between wireless tag and receiving system). Thus, it can be seen that the communication distance can be extended to about 230 m in the present invention, while the communication distance is about 105 m in the prior art. In other words, the receiving system can measure the position of the moving body about 230 m away.

  The tracking device described above is a computer, and each element can execute processing by a program. Further, the program can be stored in a storage medium so that the computer can read the program from the storage medium.

  FIG. 22 is a diagram illustrating a hardware configuration of the tracking device. An arithmetic device 2201, a data storage device 2202, a memory 2203, and a communication interface 2204 are connected to the bus. The data storage device 2202 is, for example, a ROM (Read Only Memory) or a hard disk. The memory 2203 is a normal RAM (Random Access Memory). The communication interface 2204 is used for communication with the receiver.

  The program is normally stored in the data storage device 2202, and is loaded into the memory 2203 and sequentially read into the arithmetic device 2201 for processing.

It is a figure which shows the outline | summary of the position measurement system which concerns on Embodiment 1. FIG. 6 is a diagram showing a signal state according to Embodiment 1. FIG. It is a figure which shows the structure of a transmitter. It is a figure which shows the structure of a wireless tag. It is a figure which shows the structure of a receiver. 2 is a diagram illustrating a module configuration of the tracking device according to Embodiment 1. FIG. FIG. 5 is a diagram showing a processing flow of the tracking device according to the first embodiment. It is a figure which shows the example of a wireless tag table. It is a figure which shows the example of a transmitter table. FIG. 10 is a diagram illustrating a signal state according to the second embodiment. It is a figure which shows the outline | summary of the position measurement system which concerns on Embodiment 3. FIG. FIG. 10 is a diagram illustrating a signal state according to the third embodiment. It is a figure which shows the detail of the signal which concerns on Embodiment 3. FIG. FIG. 10 is a diagram illustrating a module configuration of a tracking device according to a third embodiment. FIG. 10 is a diagram illustrating a processing flow of the tracking device according to the third embodiment. It is a figure which shows the signal state which concerns on Embodiment 4. FIG. It is a figure which shows the detail of the signal which concerns on Embodiment 4. FIG. It is a figure which shows the 1st example of arrangement | positioning of a wireless tag and a leakage cable (strip line). It is a figure which shows the 2nd example of arrangement | positioning of a wireless tag and a leakage cable (strip line). It is a figure which shows the 3rd example of arrangement | positioning of a wireless tag and a leakage cable (strip line). It is a figure which shows the signal level which concerns on this invention. It is a figure which shows the hardware constitutions of a tracking apparatus. It is a figure which shows the outline | summary of the position measuring system which concerns on a prior art. It is a figure which shows the signal level which concerns on a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Transmitter, 2 Radio tag, 3 Leakage cable or strip line, 4 Reception system, 5 Receiver, 6 Tracking apparatus, 301 Oscillator, 302 Control circuit, 303 Transmission circuit, 304 Transmission antenna, 401 Transmission / reception antenna, 402 Reception circuit, 403 rectifier circuit, 404 control circuit, 405 memory, 406 transmission circuit, 501 reception circuit, 502 timer, 503 interface, 601 measurement data input unit, 602 position determination unit, 603 wireless tag table, 604 transmitter determination unit, 605 transmitter Table, 606 Tracking processing unit, 607 Tracking data storage unit, 2201 Arithmetic unit, 2202 Data storage unit, 2203 Memory, 2204 Communication interface.

Claims (8)

A measurement system for measuring the position of a mobile body equipped with a transmitter for transmitting interrogation radio waves including unmodulated waves, the measurement system having the following elements (1) installed at a predetermined position, A plurality of wireless tags that receive the interrogation radio wave from the transmitter, modulate the unmodulated wave included in the interrogation radio wave with its own radio tag ID, and transmit the response radio wave including the modulated wave (2) Response radio wave receiving cable that is installed in a range that can receive response radio waves from multiple radio tags and that transmits response radio wave reception data received from radio tags (3) Connected to response radio wave reception cables for receiving response radio waves When the received data is input from the cable, the wireless tag ID is obtained by demodulating the modulated wave included in the received data, the position of the wireless tag is specified by the obtained wireless tag ID, and the position is Receiving system for determining the position of a mobile body Zui.   The measurement system according to claim 1, wherein the wireless tag rectifies the received interrogation radio wave, converts it into electric power, and is controlled by the converted electric power.   3. The measuring system according to claim 1, wherein the response radio wave receiving cable is a leaking cable or a strip line. The transmitter transmits a radio wave with a specific frequency for each transmitter.
The reception system stores a transmitter and a specific frequency of the transmitter in association with each other, and specifies a transmitter corresponding to the frequency of the input reception data as a measurement target transmitter. The measurement system according to any one of claims 1 to 3. The transmitter includes a modulated wave obtained by modulating its transmitter ID in the interrogation radio wave,
4. The reception system according to claim 1, wherein the reception system demodulates the modulated wave included in the reception data to acquire a transmitter ID, and specifies the transmitter as a measurement target by the acquired transmitter ID. 5. The described measurement system. The transmitter modulates the modulated wave with a command instructing the wireless tag to transmit a modulated wave in addition to its own transmitter ID during the modulation,
The measurement system according to claim 5, wherein the wireless tag modulates a modulation wave included in the response radio wave when the command is acquired by demodulating the received interrogation radio wave. A measuring system for measuring the position of a moving body, which has the following elements: (1) A transmitter that is attached to a moving body and transmits interrogation radio waves including unmodulated waves (2) predetermined A plurality of transmitting a response radio wave including the modulated wave by receiving the interrogation radio wave from the transmitter, modulating an unmodulated wave included in the interrogation radio wave with its own radio tag ID Wireless tag (3) Installed in a range that can receive response radio waves from a plurality of radio tags and transmits response radio wave reception data received from the radio tag (4) Connected with response radio wave reception cable When the reception data is input from the response radio wave receiving cable, the modulation wave included in the reception data is demodulated to acquire the wireless tag ID, and the position of the wireless tag is specified by the acquired wireless tag ID. And, the receiving system determines the position of the moving object based on the position. Connects to a response radio wave receiving cable installed in a range that can receive response radio waves including modulated waves from a wireless tag to measure the position of a mobile unit equipped with a transmitter that transmits interrogation radio waves including unmodulated waves A receiving system having the following elements: (1) a receiving circuit that demodulates received data to obtain a wireless tag ID; (2) a wireless tag ID; and the wireless tag is installed (3) A position determination unit that determines the measurement position of the moving object based on the wireless tag installation position corresponding to the wireless tag ID acquired by the receiving circuit.

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