WO2019198469A1

WO2019198469A1 - On-board device, wireless terminal, correction method, and computer program

Info

Publication number: WO2019198469A1
Application number: PCT/JP2019/012292
Authority: WO
Inventors: 奇英李
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2018-04-12
Filing date: 2019-03-25
Publication date: 2019-10-17
Also published as: JP2019184468A

Abstract

An on-board device (10) wirelessly transmits a request signal, for requesting transmission of a response signal, to a wireless terminal (20) having a flat surface. The on-board device (10) acquires: strength data indicating the reception strength of the request signal or the response signal; and angle data indicating an angle formed by the flat surface of the wireless terminal (20) and the horizontal plane. The on-board device (10) corrects the reception strength indicated by the acquired strength data, on the basis of the angle indicated by the acquired angle data.

Description

In-vehicle device, wireless terminal, correction method, and computer program

The present disclosure relates to an in-vehicle device, a wireless terminal, a correction method, and a computer program.
This application claims priority based on Japanese Patent Application No. 2018-77070 filed on Apr. 12, 2018, and incorporates all the content described in the above Japanese application.

Patent Document 1 proposes a communication system in which an in-vehicle device and a wireless terminal communicate with each other. In this communication system, when unlocking or locking a door of a vehicle, the in-vehicle device wirelessly transmits a request signal for requesting transmission of a response signal to the wireless terminal. When receiving the request signal, the wireless terminal wirelessly transmits a response signal including intensity data indicating the reception intensity of the request signal to the in-vehicle device. When the in-vehicle device receives the response signal, if the reception strength indicated by the intensity data of the response signal received by the in-vehicle device is equal to or greater than the threshold value, it is assumed that the wireless terminal is located near the door of the vehicle. Locking or locking is performed.

JP 2018-21385 A

An in-vehicle device according to an aspect of the present disclosure includes a wireless transmission unit that wirelessly transmits a request signal for requesting transmission of a response signal to a wireless terminal having a plane, and intensity data indicating reception strength of the request signal or the response signal The angle acquired by the angle acquisition unit, the angle acquisition unit for acquiring angle data indicating the angle between the plane and the horizontal plane, and the received intensity indicated by the intensity data acquired by the intensity acquisition unit And a correction unit that performs correction based on the angle indicated by the data.

A wireless terminal according to an aspect of the present disclosure is a wireless terminal having a plane, a reception unit that wirelessly receives a signal, and an intensity acquisition unit that acquires intensity data indicating the reception intensity of the signal received by the reception unit And an angle acquisition unit that acquires angle data indicating an angle between the plane and the horizontal plane, and a reception intensity indicated by the intensity data acquired by the intensity acquisition unit, based on the angle indicated by the angle data acquired by the angle acquisition unit And a correction unit for correcting.

The correction method according to an aspect of the present disclosure includes a step of obtaining reception data received by a wireless terminal having a plane, or intensity data indicating reception intensity of a transmission signal transmitted by the wireless terminal, and the plane is a horizontal plane. The method includes a step of acquiring angle data indicating an angle to be formed, and a step of correcting the reception intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data.

A computer program according to an aspect of the present disclosure acquires, in a computer, a reception signal received by a wireless terminal having a plane, or strength data indicating reception strength of a transmission signal transmitted by the wireless terminal; The step of acquiring angle data indicating the angle formed by the horizontal plane and the step of correcting the received intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data are executed.

Note that the present disclosure can be realized not only as an in-vehicle device including such a characteristic processing unit, but also as a correction method using such characteristic processing as a step, or causing a computer to execute such a step. Or as a computer program. Moreover, this indication is realizable as a semiconductor integrated circuit which implement | achieves part or all of a vehicle-mounted apparatus, or can be implement | achieved as a communication system containing a vehicle-mounted apparatus.

1 is a block diagram illustrating a main configuration of a communication system according to a first embodiment. 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 explanatory drawing of a plate | board surface angle. It is explanatory drawing of an end surface angle. It is a flowchart which shows the procedure of a terminal side transmission process. It is a block diagram which shows the principal part structure of a vehicle-mounted apparatus. It is a graph which shows an example of a correction coefficient table. It is a flowchart which shows the procedure of a terminal position update process. It is a flowchart which shows the procedure of a door process. 10 is a flowchart illustrating a procedure of terminal-side transmission processing in the second embodiment. It is a flowchart which shows the procedure of a terminal position update process. 10 is a flowchart illustrating a procedure of terminal-side transmission processing in the third embodiment. 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.

[Problems to be solved by the present disclosure]
The wireless terminal receives the request signal via the receiving antenna. The receiving antenna usually has directivity. For this reason, the receiving intensity of the request signal differs depending on the input direction of the request signal to the receiving antenna. Therefore, the position of the wireless terminal may not be detected properly. In order to appropriately detect the position of the wireless terminal, it is necessary to correct the reception intensity of the request signal to an appropriate intensity.

Also, as a configuration for detecting the position of the wireless terminal, a configuration for detecting the position based on the reception strength of the response signal instead of the reception strength of the request signal can be considered. In the wireless terminal, the response signal is output wirelessly from the transmission antenna. The transmission antenna usually has directivity as with the reception antenna. For this reason, the reception intensity of the response signal varies depending on the output direction from the transmission antenna to the in-vehicle device.

In the configuration in which the position of the wireless terminal is detected based on the reception strength of the response signal, even if the reception strength of the response signal is different, the position of the wireless terminal may not be detected properly. In order to appropriately detect the position of the wireless terminal, it is necessary to correct the reception intensity of the response signal to an appropriate intensity.

Therefore, an object is to provide an in-vehicle device, a wireless terminal, a correction method, and a computer program that can correct the received intensity of a signal received by a wireless terminal or a signal transmitted by the wireless terminal to an appropriate intensity.

[Effects of the present disclosure]
According to the present disclosure, the reception intensity of a signal received by a wireless terminal or a signal transmitted by a wireless terminal can be corrected to an appropriate intensity.

[Description of Embodiment of Present Disclosure]
First, embodiments of the present disclosure will be listed and described. You may combine arbitrarily at least one part of embodiment described below.

(1) An in-vehicle device according to an aspect of the present disclosure includes a wireless transmission unit that wirelessly transmits a request signal for requesting transmission of a response signal to a wireless terminal having a plane, and reception strength of the request signal or the response signal. An intensity acquisition unit for acquiring intensity data to be shown, an angle acquisition unit for acquiring angle data indicating an angle formed by the plane and a horizontal plane, and a reception intensity indicated by the intensity data acquired by the intensity acquisition unit. And a correction unit that performs correction based on the angle indicated by the acquired angle data.

(2) The vehicle-mounted apparatus which concerns on 1 aspect of this indication is provided with the estimation part which estimates the position of the said radio | wireless terminal based on the reception intensity which the said correction | amendment part correct | amended.

(3) In the in-vehicle device according to an aspect of the present disclosure, the number of the planes included in the wireless terminal is two or more, and the angle data indicates a plurality of the angles that each of the plurality of planes forms with a horizontal plane, The correction unit corrects the reception intensity indicated by the intensity data acquired by the intensity acquisition unit based on a plurality of angles indicated by the angle data acquired by the angle acquisition unit.

(4) A wireless terminal according to an aspect of the present disclosure is a wireless terminal having a plane, and acquires a reception unit that wirelessly receives a signal, and strength data that indicates reception strength of the signal received by the reception unit The angle data acquired by the angle acquisition unit indicates the intensity acquisition unit, the angle acquisition unit that acquires the angle data indicating the angle between the plane and the horizontal plane, and the reception intensity indicated by the intensity data acquired by the intensity acquisition unit. A correction unit that performs correction based on the angle.

(5) A correction method according to an aspect of the present disclosure includes a step of obtaining intensity data indicating a reception signal received by a wireless terminal having a plane or reception intensity of a transmission signal transmitted by the wireless terminal; Acquiring angle data indicating the angle formed by the horizontal plane, and correcting the received intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data.

(6) A computer program according to an aspect of the present disclosure acquires, in a computer, intensity data indicating a reception signal received by a wireless terminal having a plane or reception intensity of a transmission signal transmitted by the wireless terminal; The step of obtaining angle data indicating the angle between the plane and the horizontal plane and the step of correcting the received intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data are executed.

In the in-vehicle device, the wireless terminal, the correction method, and the computer program according to the above aspect, the signal received by the wireless terminal or the wireless terminal transmits based on the angle formed between the plane of the wireless terminal and the horizontal plane The received signal intensity is corrected to an appropriate intensity.

In the in-vehicle apparatus according to the above aspect, the position of the wireless terminal is accurately estimated based on the corrected reception intensity.

In the in-vehicle apparatus according to the above aspect, the reception intensity of the request signal or the response signal is further corrected to an appropriate intensity based on a plurality of angles formed by the plurality of planes of the wireless terminal and the horizontal plane.

[Details of Embodiment of the Present Disclosure]
A specific example of a communication system according to an embodiment of the present disclosure will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and it is intended that all the changes within the meaning and range equivalent to a claim are included.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a main configuration of a communication system 1 according to the first embodiment. The communication system 1 includes an in-vehicle device 10 and a wireless terminal 20. The in-vehicle device 10 is mounted on the vehicle 100. The vehicle 100 is further equipped with a plurality of

doors

11, 11,.

The in-vehicle device 10 communicates with the wireless terminal 20 wirelessly. Specifically, the in-vehicle device 10 wirelessly transmits a plurality of request signals for requesting transmission of response signals via N transmission antennas Tc1, Tc2,..., TcN (see FIG. 7). Sequentially transmit to 20. N is an integer of 2 or more. When the wireless terminal 20 receives a request signal from the in-vehicle device 10, the wireless terminal 20 wirelessly transmits a response signal including request strength data indicating the reception strength of the request signal to the in-vehicle device 10. When the in-vehicle device 10 receives N response signals corresponding to N request signals, the in-vehicle device 10 is based on N reception strengths indicated by N request strength data included in the received N response signals. The position of the wireless terminal 20 with respect to the in-vehicle device 10 is estimated.

Specifically, the position of the wireless terminal 20 estimated by the in-vehicle device 10 is one of the remote position, the vicinity position, and the in-vehicle position. The separation position is a position sufficiently away from the vehicle 100. The vicinity position is a position in the vicinity of at least one of the plurality of doors 11 outside the vehicle 100. The in-vehicle position is a position in the vehicle 100. The in-vehicle device 10 stores terminal position data indicating the position of the wireless terminal 20. Hereinafter, the position of the wireless terminal 20 is referred to as a terminal position. When the position of the wireless terminal 20 is estimated, the in-vehicle device 10 updates the terminal position indicated by the terminal position data to the estimated position.

A door knob (not shown) is attached to each of the plurality of

doors

11, 11,. For example, when the user touches one door knob in the plurality of

doors

11, 11,... While the plurality of

doors

11, 11,. ,... Are received, and unlock reception data indicating reception of the unlock instruction is input to the in-vehicle device 10.

Further, for example, when the user touches one door knob in the plurality of

doors

11, 11,... In a state where the plurality of

doors

11, 11,. 11, 11,... Are received, and locking reception data indicating reception of the locking instruction is input to the in-vehicle device 10.

When the unlocking reception data or the locking reception data is input, the in-vehicle device 10 instructs the unlocking of the plurality of

doors

11, 11,... When the terminal position indicated by the terminal position data is a nearby position. The unlocking data or the locking data for instructing the locking of the plurality of

doors

11, 11,. When the in-vehicle device 10 outputs unlocking data, a plurality of motors (not shown) unlock the plurality of

doors

11, 11,. When the in-vehicle device 10 outputs the locking data, the plurality of motors lock the plurality of

doors

11, 11,.

When the unlocking reception data or the locking reception data is input, the in-vehicle device 10 outputs both the unlocking data and the locking data when the terminal position indicated by the terminal position data is the separation position or the in-vehicle position. Absent. Therefore, neither unlocking nor locking of the plurality of

doors

11, 11,... Is performed.

FIG. 2 is a perspective view of the wireless terminal 20. The wireless terminal 20 has a rectangular plate shape and has a plate surface 20a and an end surface 20b. Each of the plate surface 20a and the end surface 20b is a flat surface and has a rectangular shape. The long side of the plate surface 20a is continuous with the long side of the end surface 20b. The end surface 20b is adjacent to the plate surface 20a.

The wireless terminal 20 is, for example, a smartphone. The frequency band of the request signal that the in-vehicle device 10 transmits to the wireless terminal 20 is included in a frequency band according to a communication standard such as Bluetooth (registered trademark) or NFC (Near Field Communication). The frequency band according to the Bluetooth (registered trademark) communication standard is the 2.4 GHz band. The frequency band corresponding to the NFC communication standard is the 13.56 MHz band. Similarly, the frequency band of the response signal transmitted from the wireless terminal 20 to the in-vehicle device 10 may be included in a frequency band according to a communication standard such as Bluetooth (registered trademark) or NFC. The frequency band of the request signal is different from the frequency band of the response signal.

As an example, each of the request signal and the response signal is a signal generated by modulating the frequency of a sinusoidal carrier wave. As another example, each of the request signal and the response signal is a signal generated by modulating the amplitude of a sinusoidal carrier wave.
The modulation method for generating the request signal may be the same as or different from the modulation method for generating the response signal.

FIG. 3 is a block diagram showing a main configuration of the wireless terminal 20. 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, an angle detection unit 34, a reception antenna Rw, and a transmission antenna Tw. The microcomputer 33 includes

input units

40, 41, 42, an output unit 43, a storage unit 44, and a control unit 45. The receiving antenna Rw and the transmitting antenna Tw are provided in the housing of the wireless terminal 20 shown in FIG.

The receiving antenna Rw is connected to the terminal receiving unit 30 and the intensity detecting unit 31. Each of the terminal receiving unit 30 and the intensity detecting unit 31 is further connected to input

units

40 and 41 included in the microcomputer 33. 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. The angle detection unit 34 is connected to an input unit 42 included in the microcomputer 33. In the microcomputer 33, the

input units

40, 41, 42, the output unit 43, the storage unit 44, and the control unit 45 are connected to the internal bus 46.

A request signal transmitted from the in-vehicle device 10 is input to the receiving antenna Rw. The reception antenna Rw outputs the input request signal to the terminal reception unit 30 and the intensity detection unit 31.
The terminal receiving unit 30 receives a request signal input from the receiving antenna Rw. Therefore, the terminal receiving unit 30 wirelessly receives the request signal from the in-vehicle device 10 via the receiving antenna Rw. When receiving the request signal, the terminal receiving unit 30 outputs reception data indicating that the request signal has been received from the in-vehicle device 10 to the input unit 40. When the reception data is input, the input unit 40 notifies the control unit 45 that the request signal has been received from the in-vehicle device 10. The request signal transmitted from the in-vehicle device 10 to the terminal reception unit 30 corresponds to a reception signal received by the terminal reception unit 30 of the wireless terminal 20.

When the request signal is input, the intensity detection unit 31 detects the received intensity of the input request signal and outputs the required intensity data indicating the detected reception intensity to the input unit 41. The control unit 45 acquires requested strength data from the input unit 41.

The angle detection unit 34 detects an angle formed by the plate surface 20a of the wireless terminal 20 with the horizontal plane H (see FIGS. 4 and 5) and an angle formed by the end surface 20b of the wireless terminal 20 with the horizontal plane H. Below, the angle which the board surface 20a makes with a horizontal surface is described as a board surface angle, and it represents with A1 so that it may mention later (refer FIG. 4). Moreover, the angle which the end surface 20b makes with a horizontal surface is described as an end surface angle, and is represented by A2 (see FIG. 5).

FIG. 4 is an explanatory diagram of the plate surface angle. FIG. 4 shows a side surface of the wireless terminal 20. The plate surface angle A1 is an angle that is greater than or equal to zero degrees and less than or equal to 90 degrees among the two angles formed by the plate surface 20a of the wireless terminal 20 and the horizontal plane H.

FIG. 5 is an explanatory diagram of the end face angle. FIG. 5 shows the front of the wireless terminal 20. The end face angle A2 is an angle that is greater than or equal to zero degrees and less than or equal to 90 degrees among two angles formed by the end face 20b of the wireless terminal 20 and the horizontal plane H.

The in-vehicle device 10 is fixed in the vehicle 100. For this reason, the request signal transmitted by the in-vehicle device 10 always propagates along a horizontal plane, for example. The reception antenna Rw of the wireless terminal 20 is, for example, a loop antenna and has directivity. For this reason, the reception intensity of the request signal differs depending on the input direction of the request signal to the wireless terminal 20.

The angle detection unit 34 includes a gyroscope or an acceleration sensor. The gyroscope is a sensor that detects the angular velocity of the wireless terminal 20. The acceleration sensor is a sensor that detects the acceleration of the wireless terminal 20. The angle detection unit 34 periodically detects the plate surface angle A1 and the end surface angle A2 based on the detection result of the sensor. Each time the angle detection unit 34 detects the plate surface angle A1 and the end surface angle A2, the angle detection unit 34 outputs angle data indicating the detected plate surface angle A1 and end surface angle A2 to the input unit 41. The control unit 45 acquires angle data from the input unit 41.

The output unit 43 outputs a data group including required intensity data and angle data to the terminal transmission unit 32 in accordance with an instruction from the control unit 45. When the data group is input from the output unit 43, the terminal transmission unit 32 outputs a response signal including the input data group to the transmission antenna Tw. The transmission antenna Tw outputs the response signal input from the terminal transmission unit 32 wirelessly. As described above, the terminal transmission unit 32 wirelessly transmits a response signal via the transmission antenna Tw.

The storage unit 44 is a nonvolatile memory. The storage unit 44 stores a computer program P3. The control unit 45 includes one or more CPUs (Central Processing Unit). One or a plurality of CPUs included in the control unit 45 executes a terminal-side transmission process of transmitting a response signal by executing the computer program P3. The computer program P3 is used to cause one or a plurality of CPUs included in the control unit 45 to execute terminal-side transmission processing.

The computer program P3 may be stored in the storage medium E3 so that it can be read by one or more CPUs included in 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, or a BD (Blu-ray (registered trademark) Disc). 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. 6 is a flowchart showing a procedure of terminal-side transmission processing. The control unit 45 executes terminal-side transmission processing when reception data is input to the input unit 40, that is, when the terminal reception unit 30 receives a request signal via the reception antenna Rw. In the terminal-side transmission process, the control unit 45 first acquires request strength data indicating the reception strength of the request signal detected by the strength detection unit 31 from the input unit 41 (step S1).

After executing Step S1, the control unit 45 acquires angle data indicating the plate surface angle A1 and the end surface angle A2 detected by the angle detection unit 34 from the input unit 42 (Step S2). Next, the control unit 45 instructs the output unit 43 to output a data group including the required intensity data and angle data acquired in steps S1 and S2 (step S3). Thereby, the output unit 43 outputs the data group to the terminal transmission unit 32. The terminal transmission unit 32 wirelessly transmits a response signal including the data group output from the output unit 43 to the in-vehicle device 10 via the transmission antenna Tw.
After executing Step S3, the control unit 45 ends the terminal side transmission process.

As described above, in the wireless terminal 20, when the terminal reception unit 30 receives the request signal wirelessly, the terminal transmission unit 32 includes the request strength data indicating the reception strength of the request signal, the plate surface angle A1, and the end surface angle A2. The response signal including the angle data indicating is transmitted wirelessly.

FIG. 7 is a block diagram showing the main configuration of the in-vehicle device 10. The in-vehicle device 10 includes a vehicle transmission unit 50, a vehicle reception unit 51, a microcomputer 52, a reception antenna Rc, and N transmission antennas Tc1, Tc2, ..., TcN. The microcomputer 52 includes

output units

60 and 61,

input units

62 and 63, a timer 64, a storage unit 65, and a control unit 66.

N transmitting antennas Tc1, Tc2,..., TcN are connected to the vehicle transmitting unit 50 separately. The vehicle transmission unit 50 is further connected to the output unit 60 of the microcomputer 52. The receiving antenna Rc is connected to the vehicle receiving unit 51. The vehicle receiving 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 timer 64, the storage unit 65 and the control unit 66 are connected to an internal bus 67.

The output unit 60 outputs request data for requesting transmission of a response signal to the vehicle transmission unit 50 in accordance with an instruction from the control unit 66. When the request data is input from the output unit 60, the vehicle transmission unit 50 sequentially outputs request signals to the N transmission antennas Tc1, Tc2,..., TcN. For example, the vehicle transmission unit 50 outputs request signals in the order of the transmission antennas Tc1, Tc2,..., TcN. Each of the transmission antennas Tc1, Tc2,..., TcN, when a request signal is input from the vehicle transmission unit 50, outputs the input request signal wirelessly.

As described above, the vehicle transmission unit 50 wirelessly sequentially transmits request signals to the terminal reception unit 30 of the wireless terminal 20 via the N transmission antennas Tc1, Tc2,..., TcN. As described above, in the wireless terminal 20, when the terminal reception unit 30 receives a request signal from the in-vehicle device 10, the terminal transmission unit 32 wirelessly transmits a response signal including the requested strength data and angle data to the in-vehicle device 10. To do. The vehicle transmission unit 50 functions as a wireless transmission unit.

The response signal transmitted wirelessly by the terminal transmission unit 32 of the wireless terminal 20 via the transmission antenna Tw is input to the reception antenna Rc. The receiving antenna Rc outputs the input response signal to the vehicle receiving unit 51.

The vehicle receiver 51 receives the response signal input to the receiving antenna Rc. Therefore, the vehicle reception unit 51 receives a response signal from the terminal transmission unit 32 of the wireless terminal 20 via the reception antenna Rc. When receiving a response signal from the in-vehicle device 10, the vehicle receiving unit 51 outputs a data group included in the received response signal to the input unit 62. As described above, the response signal data group includes required strength data and angle data.

When the data group is input from the vehicle reception unit 51, the input unit 62 notifies the control unit 66 that the vehicle reception unit 51 has received a response signal from the terminal transmission unit 32 of the wireless terminal 20. In addition, the control unit 66 acquires a data group, that is, required strength data and angle data from the input unit 62.

When unlocking instructions for a plurality of

doors

11, 11,... Are received, unlocking reception data is input to the input unit 63. When a locking instruction for a plurality of

doors

11, 11,... Is received, locking reception data is input to the input unit 63. When the unlocking reception data or the locking reception data is input, the input unit 63 notifies the control unit 66 of the input data.

The output unit 61 outputs unlocking data and locking data in accordance with instructions from the control unit 66. When the output unit 61 outputs unlocking data, the plurality of

doors

11, 11,. When the output unit 61 outputs locking data, the plurality of

doors

11, 11,.
The timer 64 starts and ends timing in accordance with instructions from the control unit 66. The time measured by the timer 64 is read from the timer 64 by the control unit 66.

The storage unit 65 is a nonvolatile memory. The storage unit 65 stores terminal position data. The terminal position indicated by the terminal position data is updated by the control unit 66. Further, the control unit 66 stores the required strength data and angle data in the storage unit 65.

The storage unit 65 further stores a computer program P5. The control unit 66 has one or a plurality of CPUs. One or a plurality of CPUs included in the control unit 66 executes the terminal position update process and the door process by executing the computer program P5. The terminal position update process is a process for updating the terminal position indicated by the terminal position data. The door process is a process for unlocking and locking the plurality of

doors

11, 11,. The computer program P5 is used to cause one or a plurality of CPUs included in the control unit 66 to execute terminal position update processing and door processing.

The computer program P5 may be stored in the storage medium E5 so that it can be read by one or more CPUs included in the control unit 66. 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 65. 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 connected to the communication network, and the downloaded computer program P5 may be stored in the storage unit 65.

As will be described later, in the terminal position update process, the control unit 66 corrects the reception strength of the request signal indicated by the request strength data based on the plate surface angle A1 and the end surface angle A2 indicated by the angle data. Specifically, the control unit 66 corrects the reception intensity by multiplying the reception intensity by a correction coefficient set in advance according to the plate surface angle A1 and the end surface angle A2. The storage unit 65 further stores a correction coefficient table indicating the relationship between the plate surface angle A1 and the end surface angle A2 and the correction coefficient. The correction coefficient is a positive real number.

FIG. 8 is a chart showing an example of the correction coefficient table. In the example of FIG. 8, when the plate surface angle A1 is 0 degree or more and less than 20 degrees, the control unit 66 multiplies the reception intensity by the correction coefficient C1 regardless of the end surface angle A2. In the case where the plate surface angle A1 is 20 degrees or more and 90 degrees or less, when the end surface angle A2 is 0 degrees or more and less than 45 degrees, the control unit 66 determines the reception intensity. Multiply by the correction coefficient C2. In the case where the plate surface angle A1 is 20 degrees or more and 90 degrees or less, when the end surface angle A2 is 45 degrees or more and 90 degrees or less, the control unit 66 determines the reception intensity. Multiply by the correction coefficient C3.

FIG. 9 is a flowchart showing the procedure of the terminal location update process. The control unit 66 periodically performs terminal location update processing. In the terminal location update process, first, the control unit 66 instructs the output unit 60 to output request data (step S11). As a result, the output unit 60 outputs the request data to the vehicle transmission unit 50. As described above, when the request data is input, the vehicle transmission unit 50 sequentially transmits N request signals to the wireless terminal 20 via the N transmission antennas Tc1, Tc2,..., TcN. To do. In the wireless terminal 20, when the terminal receiving unit 30 receives the request signal, the terminal transmitting unit 32 wirelessly transmits a response signal including the requested strength data and the angle data to the vehicle receiving unit 51.

Next, the control unit 66 instructs the timer 64 to start timing (step S12). Thereby, the timer 64 starts measuring time. After executing Step S12, the controller 66 determines whether or not the vehicle receiver 51 has received a response signal from the terminal transmitter 32 (Step S13).

When it is determined that the vehicle reception unit 51 has not received the response signal (S13: NO), the control unit 66 determines whether the time measured by the timer 64 is equal to or longer than the reference time (step) S14). When it is determined that the timekeeping time is less than the reference time (S14: NO), the control unit 66 executes Step S13.

When it is determined that the vehicle reception unit 51 has received the response signal (S13: YES), the control unit 66 acquires the required strength data and the angle data included in the response signal received by the vehicle reception unit 51 from the input unit 62. (Step S15). The control unit 66 functions as an intensity acquisition unit and an angle acquisition unit.
Next, the control part 66 memorize | stores the request | requirement intensity | strength data and angle data which were acquired by step S15 in the memory | storage part 65 (step S16). In the storage unit 65, the required strength data is associated with the angle data included in the common response signal.

Next, after executing Step S11, the control unit 66 determines whether or not the number of response signals received by the vehicle receiving unit 51 is N (Step S17). When it is determined that the number of response signals is not N (S17: NO), the control unit 66 executes Step S13 again, and the number of response signals received by the vehicle reception unit 51 is N or time counting. Wait until the time exceeds the reference time.

When it is determined that the number of response signals is N (S17: YES), the control unit 66 instructs the timer 64 to end timing (step S18). Thereby, the timer 64 ends time measurement. Next, the control unit 66 associates the N received strengths indicated by the N requested strength data stored in the storage unit 65 with the current terminal location update process with the N requested strength data. Correction is performed based on the N plate surface angles A1 and the N end surface angles A2 indicated by the individual angle data (step S19).

In step S19, the control unit 66 corrects the reception intensity of the request signal indicated by one request intensity data based on the angle data associated with the request intensity data. As described above, the control unit 66 corrects the reception intensity by multiplying the reception intensity by the correction coefficient corresponding to the plate surface angle A1 and the end surface angle A2 indicated by the angle data in the correction coefficient table. The control unit 66 also functions as a correction unit.

Next, the control unit 66 estimates the terminal position, which is the position of the wireless terminal 20 with reference to the position of the in-vehicle device 10, based on the corrected N received intensities (step S20). As described above, the estimated terminal position is one of the remote position, the vicinity position, and the in-vehicle position. The control unit 66 also functions as an estimation unit.

When it is determined that the timekeeping time is equal to or longer than the reference time (S14: YES), the control unit 66 instructs the timer 64 to end the timekeeping (step S21). As a result, the timer 64 ends timing.

After executing one of steps S20 and S21, the controller 66 updates the terminal position indicated by the terminal position data (step S22). In step S22 executed after step S20 is executed, the control unit 66 updates the terminal position indicated by the terminal position data to the terminal position estimated in step S20. In step S20 executed after executing step S21, the control unit 66 updates the terminal position indicated by the terminal position data to the remote position, assuming that the wireless terminal 20 is sufficiently away from the vehicle 100.
After executing Step S22, the control unit 66 ends the terminal location update process.

As described above, the vehicle transmission unit 50 periodically transmits N request signals to the wireless terminal 20 wirelessly, and updates the terminal position indicated by the terminal position data. When the vehicle receiving unit 51 receives N response signals, the control unit 66 displays the reception intensity indicated by the required intensity data included in each response signal, and the plate surface angle A1 indicated by the angle data included in the common response signal. And it correct | amends based on end surface angle A2. The control unit 66 estimates the terminal position based on the corrected N reception strengths, and updates the terminal position indicated by the terminal position data to the estimated terminal position.

FIG. 10 is a flowchart showing the door processing procedure. The control unit 66 performs door processing when unlocking reception data or locking reception data is input to the input unit 63. Hereinafter, data input to the input unit 63 is referred to as input data. The input data is unlocking reception data or locking reception data.

In the door process, the controller 66 first reads the terminal position indicated by the terminal position data (step S31). Next, the control unit 66 determines whether or not the terminal position read in step S31 is a neighboring position (step S32). As described above, the vicinity position is a position in the vicinity of at least one of the plurality of doors 11 outside the vehicle 100.

When it is determined that the terminal position is the vicinity position (S32: YES), the control unit 66 determines whether or not the input data is unlocking reception data (step S33). When it is determined that the input data is unlocking reception data (S33: YES), the control unit 66 instructs the output unit 61 to output unlocking data (step S34). Thereby, the output part 61 outputs unlocking data, and the plurality of

doors

11, 11,.

When the control unit 66 determines that the input data is not unlocking reception data (step S33: NO), the input data is locking reception data, and therefore instructs the output unit 61 to output the locking data (step S35). . Thereby, the output part 61 outputs locking data, and the plurality of

doors

11, 11,.
When it is determined that the terminal position is not the vicinity position (S32: NO), or after executing one of steps S34 and S35, the control unit 66 ends the door process.

As described above, when the unlocking reception data or the locking data is input to the input unit 63, when the terminal position is the vicinity position, the output unit 61 outputs the unlocking data or the locking data, and the plurality of doors 11 are output. , 11,... Are unlocked or locked.

In the in-vehicle device 10, the control unit 66 corrects the reception intensity of the request signal received wirelessly by the terminal reception unit 30 of the wireless terminal 20 to an appropriate intensity based on the plate surface angle A1 and the end surface angle A2 of the wireless terminal 20. Then, the terminal position is accurately estimated based on the corrected reception intensity. The number of angles used by the control unit 66 to correct the received intensity is two. Therefore, the reception strength of the request signal is corrected to a more appropriate strength than the reception strength corrected based on one angle.

(Embodiment 2)
In the first embodiment, the control unit 66 of the in-vehicle device 10 corrects the reception intensity of the request signal received by the terminal reception unit 30 of the wireless terminal 20. However, the subject that corrects the reception intensity is not limited to the control unit 66.
In the following, the second embodiment will be described while referring to differences from the first embodiment. Since the configuration other than the configuration described below is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the components common to 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 configurations of the in-vehicle device 10 and the wireless terminal 20 are different.
When the wireless terminal 20 in the second embodiment is compared with the wireless terminal 20 in the first embodiment, there is a difference in the configuration of the terminal transmission unit 32, the output unit 43, and the storage unit 44, and the content of the terminal-side transmission process.

In the wireless terminal 20 according to the second embodiment, the control unit 45 of the wireless terminal 20 corrects the reception strength of the request signal and generates correction data indicating the corrected reception strength. The output unit 43 outputs correction data to the terminal transmission unit 32 in accordance with an instruction from the control unit 45. When the correction data is input from the output unit 43, the terminal transmission unit 32 wirelessly transmits a response signal including the input correction data to the vehicle reception unit 51 of the in-vehicle device 10 via the transmission antenna Tw. Further, the correction coefficient table is stored not in the storage unit 65 of the in-vehicle device 10 but in the storage unit 44 of the wireless terminal 20.

FIG. 11 is a flowchart illustrating a procedure of terminal-side transmission processing according to the second embodiment. As in the first embodiment, the control unit 45 executes terminal-side transmission processing when reception data is input to the input unit 40, that is, when the terminal reception unit 30 receives a request signal. In the terminal-side transmission process, the control unit 45 first acquires, from the input unit 41, request strength data indicating the reception strength detected by the strength detection unit 31, that is, the reception strength of the request signal received by the terminal reception unit 30 ( Step S41). In the second embodiment, the control unit 45 functions as an intensity acquisition unit.

After executing step S41, the control unit 45 acquires angle data indicating the plate surface angle A1 and the end surface angle A2 detected by the angle detection unit 34 from the input unit 42 (step S42). In the second embodiment, the control unit 45 functions as an angle acquisition unit.

Next, the control unit 45 corrects the reception strength of the request signal indicated by the request strength data acquired in step S41 based on the plate surface angle A1 and the end surface angle A2 indicated by the angle data acquired in step S42 (step S43). ). Specifically, in the correction coefficient table, the control unit 45 multiplies the reception intensity indicated by the requested intensity data by the correction coefficient corresponding to the plate surface angle A1 and the end face angle A2 indicated by the angle data, thereby obtaining the reception intensity. to correct. In the second embodiment, the control unit 45 functions as a correction unit.

Next, the control unit 45 generates correction data indicating the reception intensity corrected in step S43 (step S44), and instructs the output unit 43 to output the generated correction data (step S45). Thereby, the output unit 43 outputs the correction data to the terminal transmission unit 32, and the terminal transmission unit 32 transmits the response signal including the correction data input from the output unit 43 via the transmission antenna Tw. To the vehicle receiver 51 of the vehicle.
After executing Step S45, the control unit 45 ends the terminal side transmission process.

When the in-vehicle device 10 in the second embodiment is compared with the in-vehicle device 10 in the first embodiment, there is a difference in the configuration of the vehicle receiving unit 51, the input unit 62, and the storage unit 65, and the content of the terminal location update process.
The vehicle reception unit 51 receives a response signal from the terminal transmission unit 32 of the wireless terminal 20 via the reception antenna Rc, as in the first embodiment. When the vehicle reception unit 51 receives a response signal from the in-vehicle device 10, the vehicle reception unit 51 outputs correction data included in the received response signal to the input unit 62.

When the correction data is input from the vehicle reception unit 51, the input unit 62 notifies the control unit 66 that the vehicle reception unit 51 has received a response signal from the terminal transmission unit 32 of the wireless terminal 20. Further, the control unit 66 acquires correction data from the input unit 62.
The control unit 66 stores the correction data in the storage unit 65 instead of the required intensity data and the angle data.

FIG. 12 is a flowchart showing the procedure of the terminal location update process. As in the first embodiment, the control unit 66 periodically performs terminal location update processing. Steps S51 to S54, S57, S58, S60, and S61 of the terminal location update process in the second embodiment are the same as steps S11 to S14, S17, S18, S21, and S22 of the terminal location update process in the first embodiment. Therefore, a detailed description of steps S51 to S54, S57, S58, S60, and S61 is omitted.

When it is determined that the vehicle reception unit 51 has received the response signal from the terminal transmission unit 32 (S53: YES), the control unit 66 acquires correction data included in the response signal received by the vehicle reception unit 51 from the input unit 62. Then, the acquired correction data is stored in the storage unit 65 (step S56). After executing step S56, the controller 66 executes step S57. Similar to the first embodiment, the control unit 66 waits until the number of response signals received by the vehicle receiving unit 51 becomes N after executing step S51, or until the measured time becomes equal to or greater than the reference time.

Control unit 66 executes step S58 when it is determined that the number of response signals received by vehicle receiving unit 51 from terminal transmitting unit 32 is N (S57: YES). Next, the control unit 66 uses the position of the in-vehicle device 10 as a reference based on the N reception strengths indicated by the N correction data stored in the storage unit 65 in the current terminal position update process. The terminal position which is the position of is estimated (step S59). After executing one of steps S59 and S60, the control unit 66 executes step S61 and ends the terminal location update process.

As described above, in the second embodiment, not the control unit 66 of the in-vehicle device 10 but the control unit 45 of the wireless terminal 20 corrects the reception intensity of the request signal based on the plate surface angle A1 and the end surface angle A2.

In the wireless terminal 20, the control unit 45 corrects the reception intensity of the request signal received wirelessly by the terminal reception unit 30 to an appropriate intensity based on the plate surface angle A1 and the end surface angle A2 of the wireless terminal 20. The control unit 66 of the in-vehicle device 10 accurately estimates the terminal position based on the reception intensity corrected by the control unit 45. The number of angles used by the control unit 45 to correct the reception intensity is two. Therefore, the reception strength of the request signal is corrected to a more appropriate strength than the reception strength corrected based on one angle.

In the first and second embodiments, the integer N that is the number of request signals used for estimating the position of the wireless terminal 20 is not limited to two or more, and may be one. In this case, the control unit 66 of the in-vehicle device 10 estimates the position of the wireless terminal 20 based on, for example, the corrected reception intensity of one request signal.

(Embodiment 3)
In the first and second embodiments, the terminal reception unit 30 of the wireless terminal 20 corrects the reception intensity of the request signal received from the vehicle transmission unit 50 of the in-vehicle device 10. The control unit 66 of the in-vehicle device 10 estimates the terminal position based on the corrected reception intensity. However, the reception intensity used for estimating the terminal position is not limited to the reception intensity of the corrected request signal.
In the following, the differences of the third embodiment from the first embodiment will be described. Since the configuration other than the configuration described below is the same as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the components common to the first 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 first embodiment, the configurations of the in-vehicle device 10 and the wireless terminal 20 are different.
When the wireless terminal 20 in the third embodiment is compared with the wireless terminal 20 in the first embodiment, there is a difference in the configuration of the terminal transmission unit 32 and the output unit 43 and the content of the terminal-side transmission process.

In the wireless terminal 20 according to the third embodiment, the output unit 43 outputs angle data to the terminal transmission unit 32 in accordance with an instruction from the control unit 45. When the angle data is input from the output unit 43, the terminal transmission unit 32 wirelessly transmits a response signal including the input angle data to the vehicle reception unit 51 of the in-vehicle device 10 via the transmission antenna Tw.
The configuration of the wireless terminal 20 in the third embodiment may be a configuration in which the strength detection unit 31 and the input unit 41 of the microcomputer 33 are removed from the wireless terminal 20 in the first embodiment.

The in-vehicle device 10 is fixed in the vehicle 100. For this reason, the vehicle receiving part 51 of the vehicle-mounted apparatus 10 receives the component along a horizontal surface regarding a response signal, for example. The transmission antenna Tw of the wireless terminal 20 is, for example, a loop antenna and has directivity. For this reason, the reception intensity of the response signal differs depending on the direction in which the response signal is output to the wireless terminal 20.

FIG. 13 is a flowchart illustrating a procedure of terminal-side transmission processing according to the third embodiment. As in the first embodiment, the control unit 45 executes terminal-side transmission processing when reception data is input to the input unit 40, that is, when the terminal reception unit 30 receives a request signal. In the terminal-side transmission process, the control unit 45 first acquires angle data from the input unit 41 (step S62).

Next, the control unit 45 instructs the output unit 43 to output the angle data acquired in step S62 (step S63). Thereby, the output unit 43 outputs the angle data to the terminal transmission unit 32, and the terminal transmission unit 32 transmits the response signal including the angle data input from the output unit 43 via the transmission antenna Tw. To the vehicle receiver 51 of the vehicle.
After executing Step S63, the control unit 45 ends the terminal side transmission process.

In the wireless terminal 20 according to the third embodiment, each time the terminal receiving unit 30 receives a request signal from the vehicle transmitting unit 50 of the in-vehicle device 10, the terminal transmitting unit 32 sets the plate surface angle A1 and the end surface angle A2 related to the wireless terminal 20. A response signal including the angle data shown is transmitted wirelessly to the vehicle receiver 51 of the in-vehicle device 10.
The response signal corresponds to a transmission signal transmitted by the terminal transmission unit 32 of the wireless terminal 20.

FIG. 14 is a block diagram showing a main configuration of the in-vehicle device 10. Similarly to the first embodiment, the in-vehicle device 10 includes a vehicle transmission unit 50, a vehicle reception unit 51, and a microcomputer 52. The in-vehicle device 10 has one transmission antenna Tc instead of N transmission antennas Tc1, Tc2,..., TcN. The in-vehicle device 10 further includes an intensity detection unit 70. The microcomputer 52 in the third embodiment further includes an input unit 80 in addition to the components of the microcomputer 52 in the first embodiment.

The transmission antenna Tc is connected to the vehicle transmission unit 50. The reception antenna Rc is connected not only to the vehicle reception unit 51 but also to the intensity detection unit 70. The intensity detection unit 70 is further connected to the input unit 80. The input unit 80 is further connected to the internal bus 67.

As described in the description of the first embodiment, the output unit 60 outputs request data requesting transmission of a response signal to the vehicle transmission unit 50 in accordance with an instruction from the control unit 66. When the request data is input from the output unit 60, the vehicle transmission unit 50 outputs a request signal to the transmission antenna Tc. When a request signal is input from the vehicle transmission unit 50, the transmission antenna Tc outputs the input request signal wirelessly.
As described above, the vehicle transmission unit 50 wirelessly transmits the request signal to the terminal reception unit 30 of the wireless terminal 20 via the transmission antenna Tc.

The reception antenna Rc outputs the response signal input from the terminal transmission unit 32 of the wireless terminal 20 not only to the vehicle reception unit 51 but also to the intensity detection unit 70. When a response signal is input, the intensity detection unit 70 detects the reception intensity of the input response signal and outputs response intensity data indicating the detected reception intensity to the input unit 80. The control unit 66 acquires response intensity data from the input unit 80.

When the in-vehicle device 10 in the third embodiment is compared with the in-vehicle device 10 in the first embodiment, there is also a difference in the terminal position update process.
FIG. 15 is a flowchart illustrating the procedure of the terminal location update process. As in the first embodiment, the control unit 66 periodically performs terminal location update processing. Steps S71 to S74, S75, S80, and S81 of the terminal location update process in the third embodiment are the same as steps S11 to S14, S18, S21, and S22 of the terminal location update process in the first embodiment. Therefore, a detailed description of steps S71 to S74, S75, S80, and S81 is omitted.

When the time counted by the timer 64 is less than the reference time (S74: NO), the controller 66 executes step S73, and the vehicle receiver 51 receives a response signal from the terminal transmitter 32, or Or it waits until time-measurement time becomes more than reference time. When it is determined that the vehicle reception unit 51 has received the response signal (S73: YES), the control unit 66 executes step S75, and the reception intensity detected by the intensity detection unit 70, that is, the vehicle reception unit 51 has received. Response strength data indicating the reception strength of the response signal is acquired from the input unit 80 (step S76).

After executing step S76, the control unit 66 acquires angle data included in the response signal received by the vehicle receiving unit 51 from the input unit 62 (step S77). Next, the control unit 66 corrects the reception strength of the response signal indicated by the response strength data acquired in step S76 based on the plate surface angle A1 and the end surface angle A2 indicated by the angle data acquired in step S77 (step S78). ). Specifically, the control unit 66 corrects the reception intensity by multiplying the reception coefficient indicated by the intensity data by the correction coefficient corresponding to the plate surface angle A1 and the end surface angle A2 indicated by the angle data in the correction coefficient table. To do. In the third embodiment, as in the first embodiment, the control unit 45 functions as an intensity acquisition unit, an angle acquisition unit, and a correction unit.

Next, the control unit 66 estimates the terminal position based on the corrected reception intensity (step S79). As in the first embodiment, the estimated terminal position is one of the remote position, the vicinity position, and the in-vehicle position. For example, a first area, a second area, and a third area are set with respect to reception intensity, and each of the first area, the second area, and the third area corresponds to a separation position, a vicinity position, and an in-vehicle position. In this case, in step S79, the control unit 66 estimates the terminal position to a position corresponding to the region to which the reception intensity corrected in step S78 belongs.
After executing one of steps S79 and S80, the control unit 66 executes step S81 and ends the terminal location update process.

In the in-vehicle device 10, the control unit 66 corrects the reception strength of the response signal received wirelessly by the terminal reception unit 30 of the wireless terminal 20 to an appropriate strength based on the plate surface angle A1 and the end surface angle A2 of the wireless terminal 20. Then, the terminal position is accurately estimated based on the corrected reception intensity. The number of angles used by the control unit 66 to correct the received intensity is two. Therefore, the reception strength of the response signal is corrected to a more appropriate strength than the reception strength corrected based on one angle.

In the first to third embodiments, the shape of the wireless terminal 20 is not limited to a rectangular plate shape as long as it has a flat shape. For example, the radio terminal 20 may have a plate shape and may have 3 or 5 or more end faces. Further, the number of angles used for correcting the reception intensity of the request signal and the response signal is not limited to 2, and may be 1. At this time, the plate surface angle A1 or the end surface angle A2 is used to correct the reception intensity. Even in this case, the reception intensity of the request signal or the response signal is corrected to an appropriate intensity.

Furthermore, the determination of the correction coefficient is not limited to the determination using the correction coefficient table. For example, the plate surface angle A1, the end surface angle A2, or a value calculated by substituting both the plate surface angle A1 and the end surface angle A2 into a formula having one or two angles as variables is determined as a correction coefficient. May be.
Further, the configuration for correcting the reception strength is not limited to the configuration for multiplying the reception strength by the correction coefficient. For example, a configuration in which the correction coefficient is added to the reception strength may be used.

Furthermore, the process using the terminal position indicated by the terminal position data is not limited to the door process for unlocking or locking the plurality of

doors

11, 11,..., And is a process for starting an engine (not shown) of the vehicle 100. May be. For example, when the user presses a button in the vehicle 100, an engine start instruction is accepted. When the engine start instruction is received and the terminal position indicated by the terminal position data is the in-vehicle position, the in-vehicle device 10 outputs start data instructing the engine start to start the engine. In the same case, when the terminal position indicated by the terminal position data is different from the in-vehicle position, the in-vehicle device 10 does not output start data and does not start the engine.

Further, the configuration of the in-vehicle device 10 is not limited to the configuration in which the request signal is periodically transmitted to the wireless terminal 20. The in-vehicle device 10 is configured to transmit a request signal to the wireless terminal 20 when, for example, an unlocking instruction or locking instruction for a plurality of

doors

11, 11,. Also good.

Furthermore, in Embodiments 1 to 3, a smartphone is cited as an example of the wireless terminal 20. However, the wireless terminal 20 may be a so-called electronic key. In this case, for example, a frequency band of 30 kHz to 300 kHz is used for transmission / reception of the request signal, and a frequency band of 30 MHz to 300 MHz is used for transmission / reception of the response signal.

The disclosed embodiments 1 to 3 should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Communication system 10 Vehicle-mounted apparatus 11 Door 20 Wireless terminal 20a Board surface 20b End surface 30 Terminal receiving part 31 Strength detection part 32

Terminal transmission part

33,52 Microcomputer 34

Angle detection part

40,41,42,62,63,80

Input part

43 , 60, 61

Output unit

44, 65 Storage unit 45 Control unit (strength acquisition unit, angle acquisition unit, correction unit)
46,67 Internal bus 50 Vehicle transmitter (wireless transmitter)
51 vehicle receiving unit 57 control unit (intensity acquisition unit, angle acquisition unit, correction unit, estimation unit)
64 Timer 66 Control unit 70 Strength detection unit 100 Vehicle A1 Plate surface angle A2 End surface angle C1, C2, C3 Correction coefficient E3, E5 Storage medium H Horizontal surface P3, P5 Computer program Rc, Rw Receiving antenna Tc, Tc1, Tc2,. ..TcN, Tw Transmit antenna

Claims

A wireless transmission unit that wirelessly transmits a request signal for requesting transmission of a response signal to a wireless terminal having a plane;
An intensity acquisition unit for acquiring intensity data indicating the reception intensity of the request signal or the response signal;
An angle acquisition unit for acquiring angle data indicating an angle between the plane and a horizontal plane;
An in-vehicle device comprising: a correction unit that corrects the reception intensity indicated by the intensity data acquired by the intensity acquisition unit based on an angle indicated by the angle data acquired by the angle acquisition unit.
The in-vehicle device according to claim 1, further comprising: an estimation unit that estimates a position of the wireless terminal based on the reception intensity corrected by the correction unit.
The number of the planes the wireless terminal has is 2 or more,
The angle data indicates a plurality of the angles that each of the plurality of planes forms with a horizontal plane,
The in-vehicle unit according to claim 1, wherein the correction unit corrects the reception intensity indicated by the intensity data acquired by the intensity acquisition unit based on a plurality of angles indicated by the angle data acquired by the angle acquisition unit. apparatus.
A wireless terminal having a plane,
A receiver for receiving signals wirelessly;
An intensity acquisition unit for acquiring intensity data indicating the reception intensity of the signal received by the reception unit;
An angle acquisition unit for acquiring angle data indicating an angle between the plane and a horizontal plane;
A wireless terminal comprising: a correction unit that corrects the reception intensity indicated by the intensity data acquired by the intensity acquisition unit based on an angle indicated by the angle data acquired by the angle acquisition unit.
A reception signal received by a wireless terminal having a plane, or obtaining strength data indicating reception strength of a transmission signal transmitted by the wireless terminal;
Obtaining angle data indicating an angle between the plane and a horizontal plane;
Correcting the received intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data.
On the computer,
A reception signal received by a wireless terminal having a plane, or obtaining strength data indicating reception strength of a transmission signal transmitted by the wireless terminal;
Obtaining angle data indicating an angle between the plane and a horizontal plane;
Correcting the received intensity indicated by the acquired intensity data based on the angle indicated by the acquired angle data.