WO2019117054A1 - In-vehicle device, wireless terminal, location estimation method and computer program - Google Patents

Abstract

This in-vehicle device wirelessly transmits a request signal for requesting transmission of a response signal to a wireless terminal. The in-vehicle device further wirelessly receives, from the wireless terminal, the response signal including reception intensity data which indicates the reception intensity of the request signal and arrangement data related to the arrangement of the wireless terminal. The in-vehicle device corrects the reception intensity indicated by the reception intensity data included in the received response signal on the basis of the content indicated by the arrangement data included in the received response signal. The in-vehicle device estimates the terminal position of the wireless terminal on the basis of the corrected intensity.

Description

In-vehicle device, wireless terminal, position estimation method and computer program

The present invention relates to an in-vehicle device, a wireless terminal, a position estimation method, and a computer program.
This application claims the priority based on Japanese Patent Application No. 2017-238935 filed on Dec. 13, 2017, and incorporates all the contents described in the aforementioned Japanese application.

A communication system (see Patent Document 1) has been proposed in which a wireless terminal and an on-vehicle device communicate with each other wirelessly. In the communication system described in Patent Document 1, the on-vehicle apparatus wirelessly sequentially transmits a plurality of request signals requesting transmission of a response signal via a plurality of transmission antennas. Each time the wireless terminal receives a request signal, the wireless terminal wirelessly transmits a response signal including reception intensity data indicating the reception intensity of the request signal to the on-vehicle apparatus. The on-vehicle apparatus estimates the terminal position of the wireless terminal based on the plurality of reception strengths corresponding to the plurality of request signals.

The in-vehicle device receives an unlocking instruction of the door of the vehicle, for example, when the push button provided on the doorknob of the vehicle is pressed. When receiving the unlocking instruction, the in-vehicle device determines whether to unlock the door of the vehicle based on the estimated terminal position. When it is determined that the door of the vehicle is to be unlocked, the in-vehicle device outputs unlocking data for instructing unlocking. Thus, the door of the vehicle is unlocked.

JP, 2016-169564, A

The on-vehicle apparatus according to the present aspect transmits the request signal requesting the transmission of the response signal by radio to the wireless terminal, the reception intensity data indicating the reception intensity of the request signal, and the arrangement regarding the arrangement of the wireless terminal The reception intensity data included in the response signal received by the receiving unit is based on the reception unit wirelessly receiving the response signal including the data and the content indicated by the arrangement data included in the response signal received by the reception unit. A correction unit that corrects the reception intensity shown, and an estimation unit that estimates the terminal position of the wireless terminal based on the intensity corrected by the correction unit.

The wireless terminal according to this aspect relates to a receiving unit that wirelessly receives a request signal requesting transmission of a response signal, a strength detection unit that detects the receiving strength of the request signal received by the receiving unit, and the arrangement of the own terminal A correction unit that corrects the intensity corrected by the correction unit, and a correction unit that corrects the reception intensity detected by the intensity detection unit based on an acquisition unit that acquires the arrangement data, and contents indicated by the arrangement data acquired by the acquisition unit. And a transmitter configured to wirelessly transmit the response signal including strength data.

The position estimation method according to this aspect comprises the steps of wirelessly transmitting a request signal requesting transmission of a response signal to a wireless terminal, reception intensity data indicating the reception intensity of the request signal, and arrangement regarding the arrangement of the wireless terminal Acquiring data, correcting the reception strength indicated by the acquired reception strength data based on the content indicated by the acquired arrangement data, and estimating the terminal position of the wireless terminal based on the corrected strength And.

The computer program according to the present aspect instructs the computer to wirelessly transmit a request signal requesting transmission of a response signal to a wireless terminal, reception intensity data indicating the reception intensity of the request signal, and In the wireless terminal, the step of acquiring arrangement data relating to the arrangement of the wireless terminal, the step of correcting the reception intensity indicated by the acquired reception intensity data based on the content indicated by the acquired arrangement data, and Estimating the terminal position.

The computer program according to the present aspect is a computer program executed by a wireless terminal wirelessly receiving a request signal requesting transmission of a response signal, and the computer acquires reception intensity data indicating the reception intensity of the request signal. Correcting the reception intensity indicated by the acquired reception intensity data based on the content indicated by the acquired arrangement data, and correcting the reception intensity indicated by the acquired arrangement data Instructing the wireless transmission of the response signal including the intensity data.

The present invention can not only be realized as an on-vehicle apparatus or a wireless terminal provided with such a characteristic processing unit, but also as a correction method having such characteristic processing as a step, or such a step as a computer Can be realized as a computer program to be executed. Further, the present invention can be realized as a semiconductor integrated circuit that realizes part or all of the in-vehicle device or the wireless terminal, or as a communication system including the in-vehicle device or the wireless terminal.

FIG. 1 is a block diagram showing a main configuration of a communication system in Embodiment 1. It is a perspective view of a wireless terminal. It is a block diagram which shows the principal part structure of a radio | wireless terminal. It is a flowchart which shows the procedure of a transmission process. It is a block diagram which shows the principal part structure of a vehicle-mounted apparatus. It is a flowchart which shows the procedure of a terminal position update process. It is a chart for explaining decision of arrangement state. It is explanatory drawing of the 1st example of an arrangement | positioning state. It is explanatory drawing of the 2nd example of an arrangement | positioning state. It is explanatory drawing of the 3rd example of an arrangement | positioning state. It is a flowchart which shows the procedure of door control processing. 7 is a flowchart showing the procedure of transmission processing in the second embodiment. It is a flowchart which shows the procedure of a terminal position update process. 15 is a flowchart showing the procedure of transmission processing in the third embodiment. It is a flowchart which shows the procedure of a terminal position update process.

[Problems to be solved by the present disclosure]
The reception strength of the request signal fluctuates according to the arrangement of the wireless terminal. For example, when the wireless terminal is disposed in a container such as a pocket or a bag of clothes, the wireless terminal receives a request signal that has passed through the container. When the demand signal passes through the container, the strength of the demand signal is greatly attenuated. Therefore, when the wireless terminal is disposed in the container, the reception strength of the request signal is small. For example, if the wireless terminal is located outside the housing, there is no object around the wireless terminal that significantly attenuates the strength of the request signal. Therefore, there is no unexpected attenuation in the strength of the request signal, and the reception strength of the request signal is large.

In the communication system described in Patent Document 1, the arrangement of the wireless terminals is not considered in the estimation of the terminal position of the wireless terminals. For this reason, there is a problem that an accurate terminal position can not be estimated.

Also, for example, when the wireless terminal is a smart phone, a frequency band corresponding to the Bluetooth (registered trademark) standard, that is, the 2.4 GHz band may be used to transmit the request signal. This frequency band is high. For this reason, the attenuation width of the strength of the request signal when the request signal passes through the housing is large. Therefore, when the frequency band used to transmit the request signal is high, the estimated terminal position fluctuates more depending on the arrangement of the wireless terminal.

An object of the present disclosure is to provide an on-vehicle device, a wireless terminal, a position estimation method, and a computer program that can realize accurate estimation of a terminal position of a wireless terminal.

[Effect of the present disclosure]
According to the present disclosure, accurate estimation of the terminal position of a wireless terminal can be realized.
Description of an embodiment of the present invention
First, the embodiments of the present invention will be listed and described. At least a part of the embodiments described below may be arbitrarily combined.

(1) The on-vehicle apparatus according to the present aspect transmits a request signal requesting transmission of a response signal to a wireless terminal by radio, reception intensity data indicating the reception intensity of the request signal, and the wireless terminal A reception unit wirelessly receiving the response signal including arrangement data relating to arrangement, and reception included in the response signal received by the reception unit based on contents indicated by the arrangement data included in the response signal received by the reception unit A correction unit that corrects the reception intensity indicated by the intensity data, and an estimation unit that estimates the terminal position of the wireless terminal based on the intensity corrected by the correction unit.

(2) In the on-vehicle apparatus according to this aspect, the wireless terminal has a plate shape, and the arrangement data includes a horizontal plane and an angle formed by the plate surface of the wireless terminal, and an object approaching the wireless terminal Indicates whether or not

(3) In the on-vehicle apparatus according to the present aspect, the arrangement data may be in a state in which the wireless terminal is arranged in a pocket of clothes, a state in which the wireless terminal is arranged in a bag, or the pocket And show the state of being disposed outside the crucible.

(4) The on-vehicle apparatus according to the present aspect includes a plurality of transmission antennas, the transmission unit sequentially transmits a plurality of the request signals via the plurality of transmission antennas, and the estimation unit is the correction unit The terminal position is estimated based on the plurality of intensities corrected by

(5) The wireless terminal according to the present aspect includes a receiving unit that wirelessly receives a request signal requesting transmission of a response signal, an intensity detecting unit that detects the reception intensity of the request signal received by the receiving unit, and the own terminal A correction unit for correcting the reception intensity detected by the intensity detection unit based on contents indicated by the arrangement data acquired by the acquisition unit; and an intensity corrected by the correction unit. And a transmitter configured to wirelessly transmit the response signal including the correction strength data indicating.

(6) The position estimation method according to the present aspect comprises the steps of wirelessly transmitting a request signal requesting transmission of a response signal to a wireless terminal, reception intensity data indicating the reception intensity of the request signal, and The terminal position of the wireless terminal is determined based on the step of acquiring arrangement data relating to the arrangement, the step of correcting the reception intensity indicated by the acquired reception intensity data based on the contents indicated by the acquired arrangement data, and the corrected intensity. And estimating.

(7) The computer program according to this aspect instructs the computer to wirelessly transmit a request signal requesting transmission of a response signal to the wireless terminal, and reception intensity data indicating the reception intensity of the request signal. And acquiring the arrangement data relating to the arrangement of the wireless terminal, correcting the reception intensity indicated by the acquired reception intensity data based on the contents indicated by the acquired arrangement data, and correcting the reception intensity based on the corrected intensity. Estimating the terminal position of the wireless terminal.

(8) The computer program according to the present aspect is a computer program executed by a wireless terminal wirelessly receiving a request signal requesting transmission of a response signal, and the reception intensity indicating the reception intensity of the request signal to the computer Acquiring data, acquiring arrangement data related to the arrangement of the wireless terminal, correcting the reception intensity indicated by the acquired reception intensity data based on contents indicated by the acquired arrangement data, and correcting the intensity Instructing the wireless transmission of the response signal including the correction intensity data indicating.

In the in-vehicle apparatus, the position estimation method, and the computer program according to the above aspect, the reception strength of the request signal received by the wireless terminal is corrected according to the arrangement of the wireless terminal. The terminal position of the wireless terminal is accurately estimated based on the corrected intensity.

In the on-vehicle apparatus according to the above aspect, the request signal is generated based on the angle between the horizontal surface and the plate surface of the wireless terminal, that is, the inclination of the wireless terminal and whether the object approaches the wireless terminal. Correct the reception strength of

In the on-vehicle apparatus according to the above aspect, the content indicated by the arrangement data indicates the state in which the wireless terminal is arranged in the pocket of the clothes, the state in which the wireless terminal is arranged in the bag, or It is in the state where it is arranged outside the pocket and the heel.

In the on-vehicle apparatus according to the above aspect, the plurality of request signals are sequentially transmitted through the plurality of transmission antennas, and the terminal position is estimated based on the plurality of corrected intensities.

In the wireless terminal and the computer program according to the above aspect, the reception strength of the request signal is corrected based on the content indicated by the arrangement data, and the response signal including the correction strength data indicating the corrected strength is wirelessly transmitted. Do. Therefore, it is possible to accurately estimate the terminal position of the wireless terminal based on the intensity indicated by the correction intensity data included in the response signal.

Details of the Embodiment of the Present Invention
Specific examples of the communication system according to the embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to these exemplifications, is shown by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.

(Embodiment 1)
FIG. 1 is a block diagram showing the main configuration of the communication system 1 in the first embodiment. The communication system 1 includes an on-vehicle device 10, a plurality of doors 11, 11, ... and a wireless terminal 20. The on-vehicle device 10 and the plurality of doors 11 are mounted on the vehicle 100.

For example, when the vehicle 100 is parked, the in-vehicle device 10 repeatedly transmits a request signal requesting transmission of a response signal to the wireless terminal 20 wirelessly. The frequency band of the request signal belongs to, for example, the Bluetooth (registered trademark) frequency band, that is, the 2.4 GHz band. Vehicle-specific data unique to the vehicle 100 is stored in the in-vehicle device 10. The in-vehicle device 10 transmits, to the wireless terminal 20, a request signal including vehicle-specific data as transmission source identification data for identifying a transmission source.

FIG. 2 is a perspective view of the wireless terminal 20. As shown in FIG. As shown in FIG. 2, the wireless terminal 20 has a plate shape. The wireless terminal 20 is, for example, a smartphone and is a portable terminal. When the wireless terminal 20 receives a request signal including vehicle-specific data from the in-vehicle device 10, the wireless terminal 20 transmits a response signal to the in-vehicle device 10 wirelessly. Terminal-specific data unique to the wireless terminal 20 is stored in the wireless terminal 20. The wireless terminal 20 transmits a response signal including terminal-specific data to the on-vehicle apparatus 10 as transmission source identification data. The in-vehicle device 10 wirelessly receives a response signal from the wireless terminal 20.

When receiving the response signal including the terminal-specific data, the in-vehicle device 10 estimates the terminal position of the wireless terminal 20 based on the position of the vehicle 100 based on various data included in the received response signal. The on-vehicle apparatus 10 determines whether to lock the plurality of doors 11, 11, ... or to unlock the plurality of doors based on the estimated terminal position.

The in-vehicle apparatus 10 outputs locking data for instructing locking of the plurality of doors 11, 11,... And unlocking data for instructing unlocking of the plurality of doors 11, 11,. When the in-vehicle device 10 outputs locking data, the plurality of doors 11, 11, ... are locked by a plurality of door motors (not shown). When the in-vehicle device 10 outputs unlocking data, the plurality of doors 11, 11, ... are unlocked by the plurality of door motors.

FIG. 3 is a block diagram showing the main configuration of the wireless terminal 20. As shown in FIG. The wireless terminal 20 includes a terminal reception unit 30, an intensity detection unit 31, a terminal transmission unit 32, a microcomputer (hereinafter referred to as a microcomputer) 33, a tilt detection unit 34, a proximity detection unit 35, a reception antenna Rw, and a transmission antenna Tw. The microcomputer 33 has input units 40, 41 and 42, an output unit 43, a storage unit 44 and a control unit 45.

One end of the receiving antenna Rw is connected to the terminal receiving unit 30 and the intensity detecting unit 31. The terminal reception unit 30 and the strength detection unit 31 are further connected to input units 40 and 41 of the microcomputer 33. One end of the transmission antenna Tw is connected to the terminal transmission unit 32. The terminal transmission unit 32 is further connected to the output unit 43 of the microcomputer 33. The inclination detection unit 34 and the proximity detection unit 35 are connected to the input unit 42 of the microcomputer 33. In the microcomputer 33, the input units 40, 41 and 42, the output unit 43, the storage unit 44 and the control unit 45 are connected to the internal bus 46.

The terminal reception unit 30 wirelessly receives the request signal via the reception antenna Rw. When the terminal reception unit 30 receives the request signal, the terminal reception unit 30 outputs, to the input unit 40, the transmission source identification data included in the received request signal. As described above, the request signal transmitted by the on-vehicle apparatus 10 includes vehicle-specific data as transmission source identification data. When the transmission source identification data is input from the terminal reception unit 30, the input unit 40 notifies the control unit 45 of the content of the input transmission source identification data.

The strength detection unit 31 detects the reception strength of the request signal received by the terminal reception unit 30 via the reception antenna Rw, and outputs reception strength data indicating the detected reception strength to the input unit 41. The control unit 45 acquires the reception strength data from the input unit 41.

The output unit 43 outputs the data group to the terminal transmission unit 32 according to the instruction of the control unit 45. The data group includes reception strength data, inclination data, proximity data, terminal-specific data, and the like. The tilt data indicates the angle between the horizontal surface and the plate surface of the wireless terminal 20, that is, the tilt of the wireless terminal 20. The proximity data indicates the proximity state of the wireless terminal 20, that is, whether or not an object is in proximity to the wireless terminal 20. The terminal-specific data is, as described above, transmission source identification data for identifying the transmission source of the response signal. When the data group is input from the output unit 43, the terminal transmission unit 32 wirelessly transmits a response signal including the input data group via the transmission antenna Tw. The inclination data and the proximity data correspond to arrangement data on arrangement of the wireless terminal 20 as a whole.

The tilt detection unit 34 includes, for example, an acceleration sensor that detects the acceleration of the wireless terminal 20. In this case, the tilt detection unit 34 detects the tilt of the wireless terminal 20 based on the acceleration of the wireless terminal 20. The tilt detection unit 34 periodically detects the tilt of the wireless terminal 20. The inclination detection unit 34 outputs inclination data indicating the detected inclination to the input unit 42 each time the inclination of the wireless terminal 20 is detected. The control unit 45 acquires inclination data from the input unit 42.

The tilt detection unit 34 may include, for example, a gyro sensor that detects the angular velocity of the wireless terminal 20. In this case, the tilt detection unit 34 detects the tilt of the wireless terminal 20 by integrating the angular velocity detected by the gyro sensor over time.

The proximity detection unit 35 detects the proximity of an object to one plate surface of the wireless terminal 20. When the object is close to one plate surface of the wireless terminal 20, the proximity detection unit 35 detects the proximity of the object. When the object is not in proximity to one plate surface of the wireless terminal 20, the proximity detection unit 35 does not detect the proximity of the object. The proximity detection unit 35 periodically outputs proximity data indicating a proximity state to the input unit 42. The proximity detection unit 35 outputs proximity data indicating the proximity of the object to the input unit 42 when the proximity of the object is detected, and the proximity data indicating the non-proximity of the object is input when the proximity of the object is not detected. Output to 42. The control unit 45 acquires proximity data from the input unit 42. The control unit 45 functions as an acquisition unit.

The state in which the object is in proximity to the wireless terminal 20 includes not only the state in which the object is present in the vicinity of the wireless terminal 20 but also the state in which the object is in contact with the wireless terminal 20.

The storage unit 44 is a non-volatile memory. The storage unit 44 stores a computer program P3. The control unit 45 includes one or more CPUs (Central Processing Units). One or more CPUs included in the control unit 45 execute the transmission process by executing the computer program P3 stored in the storage unit 44. The transmission process is a process for wirelessly transmitting a response signal. The computer program P3 is used to cause one or more CPUs of the control unit 45 to execute transmission processing.

The computer program P3 may be stored in the storage medium E3 so as to be readable by one or more CPUs of the control unit 45. In this case, the computer program P3 read from the storage medium E3 by a reading device (not shown) is stored in the storage unit 44. The storage medium E3 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like. The optical disc is a CD (Compact Disc) -ROM (Read Only Memory), a DVD (Digital Versatile Disc) -ROM, a BD (Blu-ray (registered trademark) Disc), or the like. The magnetic disk is, for example, a hard disk. Alternatively, the computer program P3 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded computer program P3 may be stored in the storage unit 44.

FIG. 4 is a flowchart showing the procedure of transmission processing. The control unit 45 performs transmission processing each time vehicle-specific data is input to the input unit 40, that is, each time the terminal reception unit 30 receives a request signal including vehicle-specific data via the receiving antenna Rw. . Terminal-specific data is stored in the storage unit 44.
First, the control unit 45 acquires, from the input unit 41, reception strength data indicating the reception strength of the request signal detected by the strength detection unit 31 (step S1). The reception strength data indicates the reception strength of the request signal that has triggered the start of the transmission process.

Next, the control unit 45 acquires from the input unit 42 the inclination data output from the inclination detection unit 34 and the proximity data output from the proximity detection unit 35 (step S2). Next, the control unit 45 reads terminal-specific data from the storage unit 44 (step S3).

Next, the control unit 45 instructs the output unit 43 to output a data group including the reception intensity data, the inclination data and the proximity data acquired in steps S1 and S2, and the terminal-specific data read in step S3 (step S4). Thus, the output unit 43 outputs the data group to the terminal transmission unit 32, and the terminal transmission unit 32 wirelessly transmits the response signal including the data group input from the output unit 43 to the on-vehicle device 10 via the transmission antenna Tw. Send by After executing step S4, the control unit 45 ends the transmission process.

FIG. 5 is a block diagram showing the main configuration of the on-vehicle apparatus 10. As shown in FIG. The on-vehicle apparatus 10 includes a vehicle transmission unit 50, a vehicle reception unit 51, a microcomputer 52, a reception antenna Rc, and n (n: an integer of 2 or more) transmission antennas Tc1, Tc2,. The microcomputer 52 includes output units 60 and 61, input units 62 and 63, a storage unit 64, and a control unit 65. The n transmission antennas Tc 1, Tc 2,..., Tcn are arranged in different places in the vehicle 100.

One end of each of n transmission antennas Tc1, Tc2,..., Tcn is connected to the vehicle transmission unit 50. The vehicle transmission unit 50 is further connected to the output unit 60 of the microcomputer 52. One end of the receiving antenna Rc is connected to the vehicle receiving unit 51. The vehicle reception unit 51 is further connected to the input unit 62 of the microcomputer 52. In the microcomputer 52, the output units 60 and 61, the input units 62 and 63, the storage unit 64, and the control unit 65 are connected to the internal bus 66.

The output unit 60 outputs the data group to the vehicle transmission unit 50 in accordance with the instruction of the control unit 65. This data group includes, among n transmitting antennas Tc1, Tc2, ..., Tcn, antenna data indicating a transmitting antenna used for transmitting a request signal, and vehicle specific data. When the data group is input from the output unit 60, the vehicle transmission unit 50 transmits a request signal including terminal-specific data to the wireless terminal 20 via the transmission antenna indicated by the antenna data included in the data group.

The vehicle reception unit 51 wirelessly receives the response signal via the reception antenna Rc. When the vehicle reception unit 51 receives the response signal, the vehicle reception unit 51 outputs the data group included in the received response signal to the input unit 62. When the data group is input, the input unit 62 notifies the control unit 65 of reception of the response signal. The control unit 65 acquires various data included in the data group from the input unit 62.
As described above, the data group of the response signal transmitted by the terminal transmission unit 32 of the wireless terminal 20 includes reception strength data, inclination data, proximity data, and terminal-specific data.

Locking reception data and unlocking reception data are input to the input unit 63. The locking reception data is data indicating that locking instructions for the plurality of doors 11, 11, ... have been received from the user. The unlocking reception data is data indicating that the unlocking instruction of the plurality of doors 11, 11, ... has been received from the user. The user instructs, for example, the unlocking and locking of the plurality of doors 11, 11,... By pressing a pushbutton of a door knob (not shown). When the locking reception data or the unlocking reception data is input, the input unit 63 notifies the control unit 65 of the input data.

The output unit 61 outputs locking data and unlocking data to a device (not shown) mounted on the vehicle 100 in accordance with an instruction from the control unit 65. The locking data is data for instructing locking of the plurality of doors 11, 11,. When the output unit 61 outputs locking data, a plurality of door motors lock the plurality of doors 11, 11,. The unlocking data is data for instructing the unlocking of the plurality of doors 11, 11,. When the output unit 61 outputs unlocking data, the plurality of door motors unlock the plurality of doors 11, 11,.

The storage unit 64 is a non-volatile memory. The storage unit 64 stores a computer program P5. The control unit 65 has one or more CPUs. One or more CPUs included in the control unit 65 execute the terminal position update process and the door control process by executing the computer program P5 stored in the storage unit 64.

The storage unit 64 stores terminal position data indicating a terminal position based on the position of the vehicle 100. The terminal position update process is a process of updating the terminal position indicated by the terminal position data stored in the storage unit 64. The door control process is a process for locking or unlocking the plurality of doors 11, 11,. The computer program P5 is used to cause one or more CPUs of the control unit 65 to execute terminal position update processing and door control processing.

The computer program P5 may be stored in the storage medium E5 so that one or more CPUs of the control unit 65 can read. In this case, the computer program P5 read from the storage medium E5 by a reading device (not shown) is stored in the storage unit 64. The storage medium E5 is an optical disk, a flexible disk, a magnetic disk, a magnetic optical disk, a semiconductor memory, or the like. Alternatively, the computer program P5 may be downloaded from an external device (not shown) connected to a communication network (not shown), and the downloaded computer program P5 may be stored in the storage unit 64.

FIG. 6 is a flowchart showing a procedure of terminal position update processing. For example, when the vehicle 100 is parked, the control unit 65 periodically executes terminal position update processing. The storage unit 64 stores vehicle-specific data, the value of the variable k, and terminal position data indicating the terminal position of the wireless terminal 20. The control unit 65 updates the value of the variable k and the terminal position indicated by the terminal position data.

In the terminal position update process, the control unit 65 first updates the value of the variable k stored in the storage unit 64 to 1 (step S11). Next, the control unit 65 reads vehicle-specific data from the storage unit 64 (step S12), and instructs the output unit 60 to output a data group including antenna data indicating the transmission antenna Tck and the vehicle-specific data (step S12) S13). Thus, the output unit 60 outputs a data group including antenna data and vehicle-specific data. The vehicle transmission unit 50 transmits a request signal including vehicle specific data to the wireless terminal 20 via the transmission antenna Tck indicated by the antenna data. Here, k of Tck is a value of variable k. For example, when the value of the variable k is 1, a request signal is transmitted via the transmission antenna Tc1.
Instructing the output unit 60 to output the data group corresponds to instructing the vehicle transmission unit 50 to transmit the request signal to the wireless terminal 20 by radio.

After executing step S13, the control unit 65 determines whether the vehicle reception unit 51 has received a response signal including terminal-specific data as transmission source identification data (step S14). When a data group including terminal-specific data is input to input unit 62, control unit 65 determines that vehicle reception unit 51 receives a response signal, and a data group including terminal-specific data is input to input unit 62. If not, it is determined that the vehicle reception unit 51 has not received a response signal.

When the control unit 65 determines that the vehicle reception unit 51 receives the response signal (S14: YES), the inclination data and the proximity data input to the input unit 62, that is, the response signal received by the vehicle reception unit 51 The arrangement state of the wireless terminal 20 is determined based on the included inclination data and proximity data (step S15).

FIG. 7 is a chart for explaining the determination of the placement state. FIG. 7 shows the proximity state indicated by the proximity data, the inclination of the wireless terminal 20 indicated by the inclination data, and the arrangement state determined based on the proximity state and the inclination. As described above, the inclination indicated by the inclination data is an angle formed by the horizontal surface and the surface of the wireless terminal 20.

FIG. 8 is an explanatory view of a first example of the arrangement state. As shown in FIG. 8, when the wireless terminal 20 is disposed in the pocket 70 a of the clothing 70 worn by a person, the proximity detection unit 35 of the wireless terminal 20 is an object to the wireless terminal 20 (pocket 70 a) Detect proximity of Furthermore, the tilt detection unit 34 of the wireless terminal 20 detects an angle within a vertical range that indicates that the surface of the wireless terminal 20 is substantially perpendicular to the horizontal plane. The vertical range is, for example, in the range of 80 degrees to 100 degrees.

Therefore, in step S15, when the proximity data included in the response signal indicates the proximity of the object as a proximity state, and the tilt data included in the response signal indicates an angle within the vertical range, the control unit 65 checks in FIG. As shown, the placement state is determined to be the state in which the wireless terminal 20 is placed in the pocket 70a. In the example of FIG. 8, the clothes 70 are pants. The clothes 70 are not limited to the pants, and may be clothes having pockets.

FIG. 9 is an explanatory view of a second example of the arrangement state. As shown in FIG. 9, when the wireless terminal 20 is disposed in the crucible 71, the proximity detection unit 35 of the wireless terminal 20 detects the proximity of the object (the cage 71) to the wireless terminal 20. Furthermore, the tilt detection unit 34 of the wireless terminal 20 detects an angle outside the vertical range.

Therefore, in step S15, when the proximity data included in the response signal indicates the proximity of the object as a proximity state, and the tilt data included in the response signal indicates an angle outside the vertical range, the control unit 65 checks in FIG. As shown, the placement state is determined to be the state in which the wireless terminal 20 is placed in the crucible 71.

FIG. 10 is an explanatory view of a third example of the arrangement state. As shown in FIG. 10, when the wireless terminal 20 is outside the pocket 70a and the weir 71, the proximity detection unit 35 of the wireless terminal 20 does not detect the proximity of an object to the wireless terminal 20.

Therefore, in step S15, when the proximity data included in the response signal indicates the non-proximity of the object as the proximity state, the controller 65 places the wireless terminal 20 in the pocket 70a and the weir 71 as shown in FIG. Determine the state of being placed outside of. The example of FIG. 10 shows a state in which a person holds the wireless terminal 20 by hand. As another arrangement state where the wireless terminal 20 is outside the pocket 70a and the bag 71, the wireless terminal 20 may be placed on a desk.

As shown in FIG. 6, after executing step S15, the control unit 65 determines the reception intensity indicated by the reception intensity data included in the response signal received by the vehicle reception unit 51 based on the arrangement state determined in step S15. It corrects (step S16). As described above, the arrangement state is determined by the content indicated by the inclination data and the proximity data. Therefore, in step S16, correcting the reception intensity based on the arrangement state is equivalent to correcting the reception intensity based on the content indicated by the inclination data and the proximity data included in the response signal received by the vehicle reception unit 51. Do. The control unit 65 functions as a correction unit.
As described above, the control unit 65 acquires, from the input unit 62, the reception strength data, the inclination data, and the proximity data included in the response signal received by the vehicle reception unit 51.

The control unit 65 corrects the reception strength, for example, by multiplying the reception strength indicated by the reception strength data by a coefficient. The coefficient is one or more and varies depending on the arrangement state. When the wireless terminal 20 is disposed outside the pocket 70a and the weir 71, the reception strength is multiplied by the coefficient C1. When the wireless terminal 20 is disposed in the crucible 71, the reception strength is multiplied by the coefficient C2. If the wireless terminal 20 is located in the pocket 70a, the coefficient C3 is multiplied.

As an example, coefficients C1, C2, and C3 are set as follows.
The reception strength of the request signal in the case where the wireless terminal 20 is disposed outside the pocket 70 a and the weir 71 is the reception of the request signal in the case where there is no obstacle that greatly attenuates the request signal between the on-vehicle device 10 and the wireless terminal 20 It is considered that the strength and the strength substantially match. For this reason, the coefficient C1 is set to 1.

When the wireless terminal 20 is disposed in the crucible 71, the strength of the request signal is greatly attenuated when the request signal passes through the crucible 71. Therefore, the reception strength of the request signal when the wireless terminal 20 is disposed in the crucible 71 is lower than the reception strength of the request signal when the wireless terminal 20 is outside the pocket 70 a and the crucible 71. Therefore, the coefficient C2 is set to a value larger than the coefficient C1.

When the wireless terminal 20 is disposed in the pocket 70a, the request signal passes through the human body. At this time, the strength of the request signal is attenuated more greatly. Therefore, the reception strength of the request signal when the wireless terminal 20 is disposed in the pocket 70 a is lower than the reception strength of the request signal when the wireless terminal 20 is disposed in the weir 71. Therefore, the coefficient C3 is set to a value larger than the coefficient C2.

In step S16, the control unit 65 may perform the correction by adding a coefficient to the reception intensity. Also in this case, the coefficient C2 is larger than the coefficient C1, and the coefficient C3 is larger than the coefficient C2.

After executing step S16, the control unit 65 writes correction intensity data indicating the correction intensity that is the intensity corrected in step S16 in the storage unit 64 (step S17). Next, the control unit 65 increments the value of the variable k stored in the storage unit 64 by 1 (step S18), and the value of the variable k stored in the storage unit 64 is less than or equal to the number of antennas It is determined whether or not it is (step S19). The number of antennas is the number of transmitting antennas that the on-vehicle apparatus 10 has, and is the integer n described above.

If the controller 65 determines that the value of the variable k is equal to or less than the number of antennas, that is, if it determines that n response signals are not received (S19: YES), it executes step S12. Since the value of the variable k is incremented by 1, when the control unit 65 executes the next step S13, the vehicle transmission unit 50 transmits a request signal via a transmission antenna different from the transmission antenna used for the previous transmission. Send For example, when the transmitting antenna Tc1 is used in the previous transmission, the transmitting antenna Tc2 is used in the current transmission.

Therefore, in the terminal position update process, the vehicle transmission unit 50 sequentially transmits n request signals via the n transmission antennas Tc1, Tc2, ..., Tcn. The vehicle reception unit 51 receives n response signals corresponding to these request signals. The reception intensity indicated by the reception intensity data included in each of the n response signals is corrected, and the correction intensity data indicating the correction intensity that is the corrected intensity is written in the storage unit 64. As a result, when it is determined in step S19 that the value of the variable k exceeds the number of antennas, the storage unit 64 stores n pieces of correction intensity data.

If the control unit 65 determines that the value of the variable k exceeds the number of antennas, that is, if it determines that n response signals have been received (S19: NO), the storage unit in the current terminal position update process The terminal position of the wireless terminal 20 based on the position of the vehicle 100 is estimated based on the n correction strengths indicated by the n correction strength data written in 64 (step S20). The control unit 65 also functions as an estimation unit.

If the control unit 65 determines that the vehicle reception unit 51 has not received a response signal including terminal-specific data (S14: NO), or after performing step S20, the terminal position stored in the storage unit 64 The terminal position indicated by the data is updated (step S21). In step S21 after execution of step S20, the control unit 65 updates the terminal position indicated by the terminal position data to the terminal position estimated in step S20. In step S21 after determining that the vehicle reception unit 51 did not receive the response signal, the control unit 65 updates the terminal position indicated by the terminal position data to a predetermined position. The predetermined position is preset and is a position outside the range of the position that can be estimated.

After executing step S21, the control unit 65 deletes all the correction strength data stored in the storage unit 64 (step S22), and ends the terminal position update process.

As described above, the control unit 65 periodically executes the terminal position update process, and updates the terminal position indicated by the terminal position data over time. In the terminal position update process, the vehicle transmission unit 50 sequentially transmits n request signals via the n transmission antennas Tc1, Tc2, ..., Tcn, and the control unit 65 is based on the n correction strengths. The position of the wireless terminal 20 is estimated based on the position of the vehicle 100.

FIG. 11 is a flowchart showing the procedure of the door control process. When the lock reception data or the unlock reception data is input to the input unit 63, the control unit 65 executes door control processing. First, the control unit 65 reads the terminal position indicated by the terminal position data from the storage unit 64 (step S31). Next, the control unit 65 determines whether or not the read terminal position of the wireless terminal 20 is a position within a preset setting range (step S32).
In addition, the predetermined position mentioned above is a position out of the setting range.

If the control unit 65 determines that the terminal position is within the set range (S32: YES), the control unit 65 determines whether the input data input to the input unit 63 is cancellation acceptance data (step S33). . Here, the input data is data serving as a trigger for starting the door control process. When the control unit 65 determines that the input data is unlocking acceptance data (S33: YES), the control unit 65 instructs the output unit 61 to output the unlocking data (step S34). As a result, the output unit 61 outputs unlocking data, and the plurality of door motors unlock the plurality of doors 11, 11,.

When the control unit 65 determines that the input data is not the unlocking acceptance data, that is, the input data is the locking acceptance data (S33: NO), the control unit 65 instructs the output unit 61 to output the locking data (step S35). . As a result, the output unit 61 outputs locking data, and the plurality of door motors lock the plurality of doors 11, 11,.
If the control unit 65 determines that the terminal position is not a position within the set range, that is, the terminal position is a position outside the set range (S32: NO), or after performing one of steps S34 and S35. , End the door control process.

As described above, in the door control process, when the terminal position of the wireless terminal 20 based on the position of the vehicle 100 is a position within the set range, a plurality of doors are selected according to the input data input to the input unit 63. 11, 11... Unlocking or locking is performed. When the terminal position of the wireless terminal 20 is a position out of the setting range, it is assumed that a person different from the holder of the wireless terminal 20 instructed the unlocking or locking of the plurality of doors 11, 11,. No data or unlocking data is output.

In the on-vehicle apparatus 10, the control unit 65 corrects the reception intensity of the request signal received by the wireless terminal 20 according to the arrangement of the wireless terminal 20. Therefore, the control unit 65 can accurately estimate the terminal position of the wireless terminal 20 based on the position of the vehicle 100 based on the plurality of corrected correction intensities.

Second Embodiment
In the first embodiment, the control unit 65 of the on-vehicle apparatus 10 determines the arrangement state of the wireless terminal 20. However, the control unit that determines the arrangement state is not limited to the control unit 65 of the on-vehicle device 10.
The differences between the second embodiment and the first embodiment will be described below. The configuration other than the configuration to be described later is the same as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment and the description thereof is omitted.

When the communication system 1 in the second embodiment is compared with the communication system 1 in the first embodiment, the contents of the transmission process performed by the control unit 45 of the wireless terminal 20 and the position update process performed by the control unit 65 of the on-vehicle device 10 The content is different.

FIG. 12 is a flowchart of the transmission process according to the second embodiment. In the second embodiment, as in the first embodiment, the control unit 45 executes the transmission process each time the terminal receiving unit 30 receives a request signal including vehicle-specific data via the receiving antenna Rw. Steps S41, S42, and S44 of the transmission process in the second embodiment are the same as steps S1, S2, and S3 of the transmission process in the first embodiment. Therefore, detailed description of steps S41, S42, and S44 is omitted.

After executing step S42, the control unit 45 determines the arrangement state of the wireless terminal 20 based on the inclination data and the proximity data acquired in step S42 (step S43). Step S43 is the same as step S15 of the terminal position update process performed by the control unit 65 of the in-vehicle apparatus 10 in the first embodiment. Therefore, as shown in FIG. 7, the control unit 45 determines the arrangement state based on the inclination indicated by the inclination data acquired in step S42 and the proximity state acquired in step S42. After executing step S43, the control unit 45 executes step S44.

After executing step S44, control unit 45 instructs output unit 43 to output a data group including the arrangement data indicating the arrangement state determined in step S43 and the terminal-specific data read in step S44 (step S45). ). Thereby, the output unit 43 outputs the data group to the terminal transmission unit 32, and the terminal transmission unit 32 transmits the response signal including the data group input from the output unit 43 to the vehicle of the on-vehicle device 10 via the transmission antenna Tw. Wirelessly transmit to the reception unit 51.

Specifically, the arrangement data is in the state in which the wireless terminal 20 is arranged in the pocket 70 a of the clothes 70, in the state in which the wireless terminal 20 is arranged in the crucible 71, or in the pocket 70 a and the crucible 71. It shows the state of being placed outside.
After executing step S45, the control unit 45 ends the transmission process.

The vehicle reception unit 51 of the in-vehicle device 10 wirelessly receives the response signal via the reception antenna Rc, as in the first embodiment. When the vehicle reception unit 51 receives the response signal, the vehicle reception unit 51 outputs the data group included in the received response signal to the input unit 62. When the data group is input, the input unit 62 notifies the control unit 65 of reception of the response signal. The control unit 65 acquires various data included in the data group from the input unit 62.
The data group of the response signal transmitted by the terminal transmission unit 32 of the wireless terminal 20 includes reception strength data, arrangement data, and terminal-specific data. The control unit 65 acquires from the input unit 62 the reception intensity data and the arrangement data included in the response signal received by the vehicle reception unit 51.

FIG. 13 is a flowchart showing a procedure of terminal position update processing. As in the first embodiment, for example, when the vehicle 100 is parked, the control unit 65 of the in-vehicle apparatus 10 executes a terminal position update process. Steps S51 to S54 and S57 to S61 of the terminal position update process in the second embodiment are the same as steps S11 to S14 and S18 to S22 of the terminal position update process in the first embodiment. Therefore, detailed description of steps S51 to S54 and S57 to S61 will be omitted.

In the terminal position update process, when the control unit 65 determines that the vehicle reception unit 51 has received the response signal (S54: YES), the arrangement state indicated by the arrangement data included in the response signal received by the vehicle reception unit 51 is Based on the above, the vehicle reception unit 51 corrects the reception intensity indicated by the reception intensity data included in the response signal (step S55). Step S55 is the same as step S16 of the terminal position update process in the first embodiment. Therefore, the control unit 65 corrects the reception intensity by performing multiplication or addition of coefficients according to the arrangement state indicated by the arrangement data among the coefficients C1, C2, and C3 to the reception intensity.

Next, the control unit 65 writes correction intensity data indicating the correction intensity that is the intensity corrected in step S55 in the storage unit 64 (step S56). After executing step S56, the control unit 65 executes step S57.

Also in the second embodiment, similarly to the first embodiment, the reception intensity of the request signal is corrected based on the arrangement state of the wireless terminal 20.
Among the effects exhibited by the in-vehicle device 10 according to the first embodiment, the in-vehicle device 10 according to the second embodiment similarly exerts other effects excluding the effects obtained by the control unit 65 of the in-vehicle device 10 determining the arrangement state. .

(Embodiment 3)
In the first and second embodiments, the control unit 65 of the in-vehicle apparatus 10 corrects the reception intensity of the request signal. However, the control unit that corrects the reception intensity is not limited to the control unit 65 of the on-vehicle device 10.
The differences between the third embodiment and the second embodiment will be described below. The configuration other than the configuration to be described later is the same as that of the second embodiment, so the same components as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment and the description thereof is omitted.

When the communication system 1 in the third embodiment is compared with the communication system 1 in the second embodiment, the contents of the transmission process performed by the control unit 45 of the wireless terminal 20 and the position update process performed by the control unit 65 of the in-vehicle device 10 The content is different.

FIG. 14 is a flowchart of the transmission process according to the third embodiment. In the third embodiment, as in the first and second embodiments, the control unit 45 executes the transmission process each time the terminal receiving unit 30 receives a request signal including vehicle-specific data via the receiving antenna Rw. Steps S71 to S73 and S75 of the transmission process in the third embodiment are the same as steps S41 to S43 and S44 of the transmission process in the second embodiment. Therefore, the detailed description of steps S71 to S73 and S75 is omitted.
As described above, steps S41, S42, and S44 of the transmission process in the second embodiment are the same as steps S1, S2, and S3 of the transmission process in the first embodiment.

In the transmission process, after executing step S73, the control unit 45 corrects the reception intensity indicated by the reception intensity data acquired in step S71 based on the arrangement state determined in step S73 (step S74). Step S74 is similar to step S16 of the terminal position update process in the first embodiment and step S55 of the terminal position update process in the second embodiment. Therefore, the control unit 45 corrects the reception intensity by performing multiplication or addition of coefficients according to the arrangement state indicated by the arrangement data among the coefficients C1, C2, and C3 to the reception intensity.

In step S73, the arrangement state is determined by the content indicated by the inclination data and the proximity data acquired in step S72. Therefore, correcting the reception intensity based on the arrangement state in step S74 corresponds to correcting the reception intensity based on the content indicated by the inclination data and the proximity data acquired in step S72. In the third embodiment, the control unit 45 functions as a correction unit. In the third embodiment, as in the first embodiment, the inclination data and the proximity data correspond to the arrangement data related to the arrangement of the wireless terminal 20 as a whole.
After executing step S74, the control unit 45 executes step S75.

After executing step S75, the control unit 45 instructs the output unit 43 to output a data group including the correction intensity data indicating the correction intensity which is the intensity corrected in step S74 and the terminal-specific data read in step S75. (Step S76). Thereby, the output unit 43 outputs the data group to the terminal transmission unit 32, and the terminal transmission unit 32 transmits the response signal including the data group input from the output unit 43 to the vehicle of the on-vehicle device 10 via the transmission antenna Tw. Wirelessly transmit to the reception unit 51. Therefore, instructing the output unit 43 to output a data group including the correction intensity data and the terminal-specific data corresponds to instructing the terminal transmission unit 32 to wirelessly transmit the response signal including the correction intensity data. .
After executing step S76, the control unit 45 ends the transmission process.

The vehicle reception unit 51 of the in-vehicle apparatus 10 wirelessly receives the response signal via the reception antenna Rc, as in the first and second embodiments. When the vehicle reception unit 51 receives the response signal, the vehicle reception unit 51 outputs the data group included in the received response signal to the input unit 62. When the data group is input, the input unit 62 notifies the control unit 65 of reception of the response signal. The control unit 65 acquires various data included in the data group from the input unit 62.
The data group of the response signal transmitted by the terminal transmission unit 32 of the wireless terminal 20 includes correction strength data and terminal-specific data. The control unit 65 acquires, from the input unit 62, the correction strength data included in the response signal received by the vehicle reception unit 51.

FIG. 15 is a flowchart showing a procedure of terminal position update processing. As in the first and second embodiments, for example, when the vehicle 100 is parked, the control unit 65 of the in-vehicle apparatus 10 executes a terminal position update process. Steps S81 to S84 and S86 to S90 of the terminal position update process in the third embodiment are the same as steps S51 to S54 and S57 to S61 of the terminal position update process in the second embodiment. Therefore, the detailed description of steps S81 to S84 and S86 to S90 is omitted.
As described above, steps S51 to S54 and S57 to S61 of the terminal position update process in the second embodiment are the same as steps S11 to S14 and S18 to S22 of the terminal position update process in the first embodiment.

In the terminal position update process, when the control unit 65 determines that the vehicle reception unit 51 has received the response signal (S84: YES), the storage unit 64 stores correction intensity data included in the response signal received by the vehicle reception unit 51. (Step S85). After executing step S85, the control unit 65 executes step S86.

In the wireless terminal 20 in the third embodiment, the control unit 45 corrects the reception intensity of the request signal detected by the intensity detecting unit 31 based on the content indicated by the inclination data and the proximity data, that is, the arrangement state of the wireless terminal 20. . The terminal transmission unit 32 wirelessly transmits a response signal including correction intensity data indicating the correction intensity that is the intensity corrected by the control unit 65 to the on-vehicle device 10. Every time the terminal reception unit 30 receives a request signal including vehicle-specific data, the terminal transmission unit 32 wirelessly transmits a response signal including correction intensity data. Therefore, the control unit 65 of the on-vehicle device 10 accurately determines the terminal position of the wireless terminal 20 based on the n correction strengths indicated by the n correction strength data included in the n response signals transmitted by the wireless terminal 20. Can be estimated.

In the first to third embodiments, the arrangement state is determined based on the inclination and proximity state of the wireless terminal 20. However, the elements used to determine the placement state are not limited to the inclination and proximity state of the wireless terminal 20, but the pressure applied to the wireless terminal 20, or the temperature difference between the two plate surfaces of the wireless terminal 20, etc. It may be included. Also, the wireless terminal 20 is not limited to a smart phone, and may be an electronic key.

The disclosed embodiments 1-3 are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated not by the meaning described above but by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

Reference Signs List 1 communication system 10 in-vehicle device 11 door 20 wireless terminal 30 terminal reception unit 31 intensity detection unit 32 terminal transmission unit 33, 52 microcomputer 34 inclination detection unit 35 proximity detection unit 40, 41, 42, 62, 63 input unit 43, 60, 61 output unit 44, 64 storage unit 45 control unit (acquisition unit, correction unit)
46, 66 Internal bus 50 Vehicle transmission unit 51 Vehicle reception unit 65 Control unit (correction unit, estimation unit)
70 clothing 70a pocket 71 鞄 100 vehicle E3, E5 storage medium P3, P5 computer program Rc, Rw receiving antenna Tc1, Tc2, ..., Tcn, Tw transmitting antenna

Claims (8)

1. A transmitter configured to wirelessly transmit a request signal requesting transmission of a response signal to the wireless terminal;
   A reception unit that wirelessly receives the response signal including reception intensity data indicating the reception intensity of the request signal and arrangement data on arrangement of the wireless terminal;
   A correction unit that corrects the reception intensity indicated by the reception intensity data included in the response signal received by the reception unit based on the content indicated by the arrangement data included in the response signal received by the reception unit;
   An estimation unit configured to estimate a terminal position of the wireless terminal based on the intensity corrected by the correction unit.
2. The wireless terminal has a plate shape,
   The in-vehicle apparatus according to claim 1, wherein the arrangement data indicates a horizontal plane, an angle formed by a plate surface of the wireless terminal, and whether an object is in proximity to the wireless terminal.
3. The placement data may be in a state in which the wireless terminal is placed in a pocket of clothes, in a state in which the wireless terminal is placed in a bag, or in a state outside the pocket and the bag. An in-vehicle device according to claim 1.
4. With multiple transmit antennas,
   The transmission unit sequentially transmits a plurality of the request signals via the plurality of transmission antennas,
   The in-vehicle device according to any one of claims 1 to 3, wherein the estimation unit estimates the terminal position based on a plurality of intensities corrected by the correction unit.
5. A receiving unit that wirelessly receives a request signal requesting transmission of a response signal;
   An intensity detection unit that detects the reception intensity of the request signal received by the reception unit;
   An acquisition unit that acquires arrangement data related to the arrangement of the own terminal;
   A correction unit that corrects the reception intensity detected by the intensity detection unit based on the content indicated by the arrangement data acquired by the acquisition unit;
   A transmitter configured to wirelessly transmit the response signal including correction intensity data indicating the intensity corrected by the correction unit.
6. Wirelessly transmitting to the wireless terminal a request signal requesting transmission of the response signal;
   Acquiring reception strength data indicating reception strength of the request signal, and arrangement data on arrangement of the wireless terminal;
   Correcting the reception intensity indicated by the acquired reception intensity data based on the content indicated by the acquired arrangement data;
   Estimating a terminal position of the wireless terminal based on the corrected strength.
7. On the computer
   Instructing a wireless terminal to wirelessly transmit a request signal requesting transmission of a response signal;
   Acquiring reception strength data indicating reception strength of the request signal, and arrangement data on arrangement of the wireless terminal;
   Correcting the reception intensity indicated by the acquired reception intensity data based on the content indicated by the acquired arrangement data;
   Estimating a terminal position of the wireless terminal based on the corrected intensity.
8. A computer program executed by a wireless terminal wirelessly receiving a request signal requesting transmission of a response signal, the computer program comprising:
   On the computer
   Acquiring reception strength data indicating the reception strength of the request signal;
   Obtaining configuration data related to the configuration of the wireless terminal;
   Correcting the reception intensity indicated by the acquired reception intensity data based on the content indicated by the acquired arrangement data;
   Instructing the wireless transmission of a response signal that includes correction intensity data indicating the corrected intensity.
   

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