JP2021148578A - Object detector - Google Patents

Abstract

To provide an object detector and a method for detecting an object that can determine the boarding state of a passenger in a vehicle without attaching a dedicated device, and a method for detecting an object.SOLUTION: The object detector includes: a radio wave sending unit having a plurality of sending antennas arranged in one place of a closed space and emitting a sending wave by each sending antenna; a radio wave receiving unit having a plurality of receiving antennas arranged in another place of the closed space and receiving the sending wave by each receiving antenna; a radio wave intensity information acquisition unit for acquiring radio wave intensity information showing the radio wave intensity of the sending wave emitted from each sending antenna at each receiving antenna; and a detection unit for detecting an object in the closed space on the basis of the radio wave intensity shown by the radio wave intensity information and a predetermined reference intensity.SELECTED DRAWING: Figure 2

Description

The present invention relates to a device for detecting the position of an object.

In recent years, for example, in automobiles and the like, a seating sensor that determines a position where a passenger is on board has become widespread. For example, a seating sensor using a pressure-sensitive switch or the like built in a seat and a passenger detecting device using an in-vehicle camera are widely known.

Further, for example, in Patent Document 1, the distance between the distance sensor and the back of each seat is measured by providing a distance sensor on the dashboard facing the seat in the automobile or the back of the front seat. A occupant detection device for determining whether an occupant is sitting on a seat is disclosed.

Japanese Unexamined Patent Publication No. 2010-214981

However, installing an in-vehicle camera or installing a sensor in each of the seats to determine the position of a passenger in an automobile requires a dedicated device, which requires a large cost and man-hours for installation and maintenance. In some cases. In addition, taking a picture of the inside of the vehicle with an in-vehicle camera or the like may cause discomfort to the passengers. In addition, when the in-vehicle camera is installed in front of the vehicle, the information of the passenger in the back seat becomes a shadow of the front seat and the passenger's boarding status cannot be grasped, so that multiple cameras need to be installed. There is.

Further, in recent years, networking has been promoted in conference rooms and automobiles, and the installation of wireless communication devices such as Wi-Fi has become widespread in indoors and automobiles.

The present invention has been made in view of the above points, and an object of the present invention is to provide an object detection device capable of suitably determining the boarding state of a occupant in a space.

The invention according to claim 1 has a radio wave transmitting unit having a plurality of transmitting antennas arranged at one location in a closed space and transmitting a transmitted wave through each of the plurality of transmitting antennas, and the closed space. A radio wave receiving unit having a plurality of receiving antennas arranged at other locations and receiving the transmitted wave via each of the plurality of receiving antennas, and the plurality of transmitting antennas in each of the plurality of receiving antennas. Based on the difference between the radio wave strength information acquisition unit that acquires the radio wave strength information indicating the radio wave strength of each of the transmitted waves transmitted from each, and the radio wave strength indicated by the radio wave strength information and a predetermined reference strength. It is characterized by having a detection unit for detecting an object in a closed space.

The invention according to claim 6 is an object detection method in which an object detection device including a radio wave transmitting unit having a plurality of transmitting antennas and a radio wave receiving unit having a plurality of receiving antennas detects an object in a closed space. The radio wave intensity information acquisition step for acquiring the radio wave intensity information indicating the radio wave intensity of each of the transmitted waves transmitted from each of the plurality of transmitting antennas in each of the plurality of receiving antennas, and the radio wave intensity indicated by the radio wave intensity information in advance. It is characterized by having a detection step of detecting an object in the closed space based on a difference from a predetermined reference strength.

The invention according to claim 7 is an object detection program executed by an object detection device provided in a computer, and is a transmission transmitted to the computer from each of the plurality of transmitting antennas in each of the plurality of receiving antennas. An object in the closed space is detected based on the difference between the radio wave intensity information acquisition step of acquiring the radio wave intensity information indicating the radio wave intensity of each wave and the radio wave intensity indicated by the radio wave intensity information and a predetermined reference intensity. It is characterized by executing the detection step to be performed.

It is a top view of the interior of the passenger compartment of the automobile M equipped with the object detection device 10 according to the embodiment of the present application. It is a functional block diagram of the object detection device 10 which concerns on embodiment of this application. It is a figure which shows the propagation path of the radio wave between the transmitting part 13 and the receiving part 15 which concerns on embodiment of this application. It is a figure which shows the CSI curve measured when the cabin CA is unmanned by the object detection device 10 which concerns on embodiment of this application. FIG. 5 is a diagram showing a CSI curve measured when a crew member is on board in the cabin CA by the object detection device according to the embodiment of the present application. FIG. 5 is a diagram showing a difference curve between a CSI curve measured when the cabin CA is unmanned and a CSI curve measured when a crew member is on board the object detection device 10 according to the embodiment of the present application. It is a figure which shows the acquisition data acquired by the object detection apparatus 10 which concerns on embodiment of this application, and the determination table which determines the boarding state of a occupant. This is a determination flow RT1 for determining the boarding state of the occupant of the object detection device 10 according to the embodiment of the present application. It is a figure which shows the example of the determination table used for determining the boarding state of the passenger of the object detection apparatus 10 which concerns on embodiment of this application. It is a generation flow RT2 which generates the determination table of the object detection apparatus 10 which concerns on embodiment of this application. It is a determination condition change flow RT3 which changes the determination condition depending on whether or not the passenger's boarding state is determined by the object detection device 10 according to the embodiment of the present application. It is a determination condition change flow RT4 which changes the determination condition depending on whether or not the passenger's boarding state is determined by the object detection device 10 according to the embodiment of the present application.

Examples of the present invention will be described in detail below.

FIG. 1 is a top view of a passenger compartment CA of an automobile M equipped with the object detection device 10 according to the embodiment of the present application. For ease of understanding, the roof, door panel, etc. of the automobile M are not shown.

The object detection device 10 is an object detection device that determines the boarding state of a crew member or the installation state of luggage in the cabin CA by propagating radio waves into the cabin CA of the automobile M.

In the passenger cabin CA of the automobile M, the driver's seat DS and the passenger's seat PS are arranged side by side in front. In addition, a rear seat RS is arranged behind the cabin CA. When the automobile M is driven, the driver DP is seated in the driver's seat DS, and the passenger can be seated in either the passenger seat PS or the rear seat RS.

The object detection device 10 is mounted in, for example, the dashboard of the automobile M. The object detection device 10 is configured to be able to transmit radio waves in the guest room CA, and is configured to be able to receive and acquire the transmitted radio waves.

The transmission unit 13 as a radio wave transmission unit is communicably connected to the object detection device 10, and is configured to convert an electric signal output from the object detection device 10 into a radio wave signal and transmit it to the guest room CA. ing. The transmission unit 13 is arranged, for example, in the dashboard in front of the guest room CA. The transmitting unit 13 has, for example, a plurality of transmitting antennas arranged near the front end of the guest room, specifically, in the dashboard or on the dashboard, and the plurality of transmitting antennas are directed toward the cabin CA. Can transmit radio waves.

The receiving unit 15 as a radio wave receiving unit is communicably connected to the object detection device 10, receives a radio wave signal propagating in the guest room CA, converts the radio wave signal into an electric signal, and connects the object detection device 10 to the object detection device 10. It is configured to be transmittable. The receiving unit 15 is arranged in, for example, a trunk room behind the guest room CA. The receiving unit 15 has, for example, a plurality of receiving antennas arranged near the rear end of the passenger cabin, specifically, in the space behind the headrest of the rear seat RS or in the trunk room, and the plurality of receiving antennas are used. , It is possible to receive radio waves transmitted from the above-mentioned transmitting antenna and propagated in the cabin CA.

The transmission unit 13 transmits a transmission wave including a carrier wave (hereinafter, referred to as a carrier) in a plurality of bands via each of the plurality of transmission antennas. Further, the receiving unit 15 receives the transmitted wave transmitted through the plurality of transmitting antennas via each of the plurality of receiving antennas.

In this embodiment, a case where the transmitting unit 13 and the receiving unit 15 provided with the communication antenna are arranged at the front end and the rear end of the guest room CA will be described. However, the arrangement of the transmitting unit 13 and the receiving unit 15 is not limited to this. The transmitting unit 13 may be arranged at the rear end of the cabin CA, the receiving unit 15 may be arranged at the front end of the cabin CA, or the transmitting unit 13 and the receiving unit 15 may be arranged in the left and right door panels of the automobile M. .. Further, only the communication antenna may be arranged at the front end and the rear end of the cabin CA and wired to the transmitting unit 13 and the receiving unit 15. That is, the radio wave may be transmitted from one end of the guest room CA and propagated in the guest room CA, and the radio wave may be received at the other end facing the one end of the guest room CA.

In other words, the transmitting unit 13 is arranged at one end of the guest room CA, and the receiving unit 15 is arranged at the other end facing the one end of the guest room CA.

The object detection device 10 is configured to be capable of transmitting and receiving radio waves conforming to the IEEE 802.11 communication standard via, for example, the transmission unit 13 and the reception unit 15.

Further, the console 17 is arranged, for example, on the instrument panel in the guest room CA. Further, the console 17 includes a display unit 17A and an operation unit 17B that are communicably connected to the object detection device 10. The display unit 17A can display the determination result output from the object detection device 10 or the image of the operation reception display on the object detection device 10. Further, the operation unit 17B can transmit an operation instruction to the object detection device 10 by selecting the operation reception display on the object detection device 10 displayed on the display unit 17A. The aspect of the console 17 is not limited to any aspect. Specifically, for example, the console 17 may be a touch panel display provided with a display such as a liquid crystal panel and a touch pad attached to the display surface of the display and accepting operations with a human finger or the like, or a liquid crystal panel or the like. It may also have a mode in which the display and the operation unit by the push button are provided. The console 17 can be replaced with various devices having a display unit and an operation unit such as a mobile terminal.

FIG. 2 is a functional block diagram of the object detection device 10 according to the embodiment of the present application. The object detection device 10 is, for example, a device in which an input unit 30, an output unit 20, a display output unit 40, an operation reception unit 50, a storage unit 60, and a control unit 70 cooperate with each other via a system bus 19. Is.

The output unit 20 is an interface that outputs data to an external device of the object detection device 10. The output unit 20 is connected to a transmission unit 13 arranged in the guest room CA, and data can be output to these transmission units 13. Specifically, for example, the object detection device 10 outputs the communication data of the electric signal to the transmission unit 13 via the output unit 20.

The transmission unit 13 is, for example, a radio wave transmission device having a plurality of transmission antennas 13A and 13B. The transmission unit 13 converts the electric signal supplied via the output unit 20 into a radio wave signal, and transmits the electric signal as radio waves into the guest room CA via each of the transmission antennas 13A and 13B.

The receiving unit 15 is, for example, a radio wave receiving device having a plurality of receiving antennas 15A, 15B and 15C. The receiving unit 15 receives radio waves transmitted from each of the transmitting antennas 13A and 13B of the transmitting unit 13 into the guest room CA via each of the receiving antennas 15A, 15B and 15C. The receiving unit 15 converts the radio signal received by each of the receiving antennas 15A, 15B and 15C into communication data of an electric signal and outputs the signal.

The input unit 30 is an interface for acquiring data from an external device of the object detection device 10. The input unit 30 is connected to a receiving unit 15 arranged in the guest room CA. Specifically, for example, the object detection device 10 acquires communication data of an electric signal from the receiving unit 15 via the input unit 30.

The display output unit 40 is an interface that outputs data to an external device of the object detection device 10. The display output unit 40 is connected to the display unit 17A of the console 17 described above, and can output an image to these. Specifically, for example, the object detection device 10 is an operation image that serves as a determination result of determining the boarding state of the occupant on the display unit 17A and an operation reception display for the operation of the object detection device 10 via the output unit. Is output.

The operation reception unit 50 is an interface for acquiring an operation input signal from an external device. The operation reception unit 50 is connected to the operation unit 17B of the console 17, and can acquire a signal indicating the operation received for the operation image by the operation unit 17B.

The storage unit 60 is composed of, for example, a hard disk device, an SSD (solid state drive), a flash memory, or the like, and stores various programs related to the generation of transmission data and the reception of the transmission data in the object detection device 10. The various programs may be acquired from another server device or the like via a network (not shown), or may be recorded on a recording medium and read via various drive devices. May be good.

Various programs stored in the storage unit 60 can be transmitted via a network, and can be recorded on a computer-readable recording medium and transferred. Further, the storage unit 60 can store data captured from the outside of the object detection device 10, for example, communication data captured from the receiving unit 15. Further, the storage unit 60 can store the data generated inside the object detection device 10.

The control unit 70 is composed of a CPU (Central Processing Unit) 70A, a ROM (Read Only Memory) 70B, a RAM (Random Access Memory) 70C, and the like, and functions as a computer. In the control unit 70, the CPU realizes various functions by reading and executing various programs stored in the ROM and the storage unit 60.

The control unit 70 supplies communication data to the transmission unit 13 via the output unit 20 based on the program stored in the storage unit 60. The transmission unit 13 converts the communication data into a radio wave signal and transmits a transmission wave including a plurality of carriers via each of the transmission antennas 13A and 13B.

Further, the control unit 70 acquires communication data via the input unit 30 based on the program stored in the storage unit 60. The receiving unit 15 receives the radio wave signal propagating in the cabin CA at each of the receiving antennas 15A, 15B and 15C, and converts the radio wave signal into communication data of an electric signal. The control unit 70 acquires the communication data of the electric signal via the input unit 30. At this time, the control unit 70 functions as a radio wave intensity information acquisition unit.

The control unit 70 includes a plurality of carriers transmitted from each of the plurality of transmitting antennas 13A and 13B, for example, transmitting a transmission wave such as a PING (hereinafter, may be simply referred to as a PING signal) to a plurality of receiving antennas 15A. By receiving at each of 15B and 15C, the CSI (Channel. State Information) curve, which is the radio field intensity for each carrier in each propagation path of the transmitted wave, is measured. Further, by measuring the change of the CSI curve before and after boarding the crew member in the cabin CA of the automobile M, it is possible to determine the number of crew members and the boarding position of the crew member in the cabin CA. At this time, the control unit 70 functions as a detection unit.

In other words, the object detection device 10 has a plurality of transmitting antennas arranged at one location in the guest room CA, and a transmission unit 13 that transmits a radio wave signal via each of the plurality of transmitting antennas, and the guest room CA. A receiving unit 15 having a plurality of receiving antennas arranged at other locations and receiving a radio wave signal via each of the plurality of receiving antennas, and transmitting from each of the plurality of transmitting antennas in each of the plurality of receiving antennas. A control unit 70 that acquires a CSI curve indicating the radio wave intensity of each of the transmitted waves and detects a occupant in the cabin CA based on the difference between the radio wave intensity indicated by the CSI curve and a predetermined reference intensity. Have.

The radio wave signal is a radio wave signal including carriers in a plurality of bands.

In this embodiment, as described above, the case where the transmitting unit 13 includes two transmitting antennas and the receiving unit 15 includes three receiving antennas will be described. However, the number of transmitting antennas and receiving antennas provided in the transmitting unit 13 and the receiving unit 15 is not limited to this. Specifically, it may be configured so that a plurality of radio wave propagation paths can be obtained between the transmitting unit 13 and the receiving unit 15.

FIG. 3 is a diagram showing a radio wave propagation path between the transmitting unit 13 and the receiving unit 15 according to the embodiment of the present application. As described above, in the present embodiment, the case where the transmitting unit 13 includes two transmitting antennas and the receiving unit 15 includes three receiving antennas will be described.

The radio waves are transmitted from the transmitting antennas 13A and 13B via the transmitting unit 13. Each of the radio waves transmitted from the transmitting antennas 13A and 13B is received by each of the receiving antennas 15A, 15B and 15C, and is supplied to the object detection device 10 via the receiving unit 15. Therefore, the radio wave transmitted from the transmitting antenna 13A has three propagation paths: the path P1 received by the receiving antenna 15A, the path P2 received by the receiving antenna 15B, and the path P3 received by the receiving antenna 15C. On the other hand, the radio wave transmitted from the transmitting antenna 13B has three propagation paths: a path P4 received by the receiving antenna 15A, a path P5 received by the receiving antenna 15B, and a path P6 received by the receiving antenna 15C. .. That is, in this embodiment, the radio wave propagation path of the object detection device 10 has a total of 6 propagation paths of paths P1 to P6.

The object detection device 10 measures the radio wave strength for each carrier in the propagation paths of the paths P1 to P6 when the cabin CA is unmanned and when the crew is on board, and based on the difference in the radio wave strength, the object detection device 10 is inside the cabin CA. Determine the number of crew members and the boarding position of the crew members in.

First, a method of determining the number of passengers and the boarding position in the cabin CA will be described from the CSI curve when the cabin CA is unmanned and when the crew is on board and the difference thereof.

FIG. 4 is a diagram showing a CSI curve measured by the object detection device 10 according to the embodiment of the present application when the cabin CA is unmanned.

The horizontal axis shows the carrier number, and the vertical axis shows the radio field strength of each carrier number. The curve in the figure is a CSI curve showing the radio field intensity at each carrier number when the receiving unit 15 receives the PING signal oscillated by the control unit 70 via the transmitting unit 13. Further, each curve shows paths P1 to P6 which are propagation paths between the transmitting antennas 13A and 13B and the receiving antennas 15A, 15B and 15C. In this embodiment, a case where the number of carriers of radio waves is 30 will be described.

The CSI curve is, for example, measured and averaged the radio field intensity of each propagation path and each carrier number between the transmitting unit 13 and the receiving unit 15 at a predetermined time. The measurement time of the radio wave intensity at the time of acquiring the CSI curve can be arbitrarily set. For example, the measurement time may be set to a fixed time, or may be set automatically, such as detecting a change in radio field intensity due to a change in the boarding state in the cabin CA and automatically ending the measurement. ..

As shown in FIG. 4, the paths P1 to P6 are determined by the positions of the driver's seat DS, the passenger seat PS, the rear seat RL, the transmitting antenna, the receiving antenna, the transmitting antenna, the directivity of the receiving antenna, etc., which are arranged in the passenger compartment CA. Therefore, the behavior of the CSI curve changes greatly.

As described above, the CSI curve determines the radio wave intensity for each of the plurality of bands in each of the plurality of propagation paths of the radio wave signal transmitted through each of the plurality of transmitting antennas and received through each of the plurality of receiving antennas. It is a CSI curve shown by each.

FIG. 5 is a diagram showing a CSI curve measured when a crew member boarded the cabin CA by the object detection device 10 according to the embodiment of the present application.

In this embodiment, the case where the driver DP is seated only in the driver's seat DS will be described.

In addition, even in the CSI curve when the crew is on board, the radio wave intensity of each propagation path and each carrier number is measured between the transmitting unit 13 and the receiving unit 15 at a predetermined time in the same manner as in the CSI curve when the crew is unmanned. , It is an averaged one. Further, the measurement time of the radio wave intensity at the time of acquiring the CSI curve can be arbitrarily set. For example, the measurement time may be set to a fixed time, or may be set automatically, such as detecting a change in radio field intensity due to a change in the boarding state in the cabin CA and automatically ending the measurement. ..

As shown in FIG. 5, when a passenger boarded in the cabin CA, the propagation condition of radio waves between the transmitting antennas 13A and 13B and the receiving antennas 15A, 15B and 15C changed, and the acquired CSI curve also changed. Appears.

FIG. 6 is a diagram showing a difference curve of the CSI curve measured by the object detection device 10 according to the embodiment of the present application when the cabin CA is unmanned and when a crew member is on board. Specifically, the control unit 70 is a difference curve obtained by subtracting the radio field strength of each carrier number when the passenger boarded from the radio field strength of each carrier number when the passenger cabin CA is unmanned. That is, the difference curve is the amount of variation of the CSI curve when the cabin CA is unmanned and when the passenger is on board.

The control unit 70 calculates the difference curve shown in FIG. 6 from the CSI curve when the cabin CA shown in FIGS. 4 and 5 is unmanned and when the crew is on board. Further, the control unit 70 extracts numerical values of a predetermined path and a predetermined carrier number from the difference curve and uses them as acquired data.

Further, the control unit 70 compares the acquired data with the determination table recorded in advance in the storage unit 60, and determines the number of crew members and the boarding position in the cabin CA based on the comparison result.

FIG. 7 is a diagram showing an example of an acquisition data acquired by the object detection device 10 according to the embodiment of the present application and a determination table for determining the boarding state of the occupant.

The upper part of FIG. 7 shows the acquired data obtained by extracting the numerical values of the predetermined path and the predetermined carrier number from the difference curve calculated based on the CSI curve when the cabin CA is unmanned and when the crew is on board. Further, the lower part of FIG. 7 shows the determination data obtained by extracting the numerical values of the path and the carrier number used for the acquired data from the determination table held by the storage unit 60.

The control unit 70 extracts a numerical value of a predetermined carrier number from the calculated difference curve when determining the boarding state of the crew member. In this embodiment, the case where the numerical values of the carriers of the carrier numbers 5, 15 and 25 are extracted will be described.

Further, the control unit 70 calculates, for example, the sum of the absolute values of the extracted carrier numbers in each of the paths P1 to P6. The control unit 70 selects a predetermined number of paths in order from the one having the largest sum of the calculated absolute values and uses them as acquired data. In this embodiment, a case where paths P1, P2, and P3 are selected as acquired data will be described.

Further, the determination table is recorded in the storage unit 60 and is read out when the control unit 70 determines the boarding state from the acquired data.

In the judgment table, for example, only the driver is seated in the driver's seat DS, the driver is seated in the driver's seat DS and the passenger is seated in the passenger seat PS, or the driver is for the driver. All paths and carrier number values of the difference curve of the pattern in which the passenger can be seated in the cabin CA of the automobile M, such as the passenger being seated on the seat DS and on the left side of the rear seat RS, are recorded. Has been done.

The control unit 70 compares the acquired data with the determination table previously recorded in the storage unit 60, and determines the boarding state of the crew members in the cabin CA based on the comparison result.

In this embodiment, the extracted carrier numbers will be described as 5, 15 and 25, but the extracted carrier numbers and quantities are not limited thereto. A predetermined number of carrier numbers may be set in advance as in this embodiment, or the carrier number between the maximum value, the minimum value, the maximum value and the carrier number indicating the maximum value and the minimum value of the difference curve, and the maximum value and the minimum value may be set. A predetermined quantity may be automatically extracted from the value. Moreover, you may use all carrier numbers as acquisition data.

Further, in this embodiment, it is described that 3 paths are calculated and automatically selected in descending order of the sum of the absolute values of the extracted carrier numbers as the acquired data. However, the method and quantity for selecting the paths. Is not limited to this. Predetermined paths may be set in advance, or numerical values of all paths may be used as determination data.

However, since the boarding state of the passenger is determined from the amount of change between the CSI curve when the cabin CA is unmanned and the CSI curve when the passenger boarded, it is preferable to select one having a large difference.

The control unit 70 compares the acquired data with the recorded determination table, and determines determination data having a numerical value of the passenger's boarding state indicating the same value as the numerical value of the carrier number in each of the paths of the acquired data or within a predetermined numerical range. Is searched from the judgment table.

When the boarding state determination data satisfying the above conditions is found, the control unit 70 determines that the boarding state is the boarding state in the cabin CA, and displays the determination result on the console 17.

The conditions under which the acquired data and the judgment data in the judgment table match can be arbitrarily set. It may be set in advance by the user or the manufacturer, or may be automatically changed depending on the pros and cons of the determination result.

The determination result may be compared with the state of wearing the seatbelt, and the passengers who are not wearing the seatbelt may be encouraged to wear the seatbelt. In addition, audio settings such as sound field and volume optimization in the cabin CA may be adjusted depending on the boarding state.

FIG. 8 is a determination flow RT1 for determining the boarding state of the occupant of the object detection device 10 according to the embodiment of the present application.

First, the control unit 70 acquires the CSI curve when the cabin CA is unmanned (step S101). This process may be performed, for example, by confirming that the door lock of the automobile M has been released. Further, this process does not have to be executed every time, for example. Specifically, this process is executed before the product is shipped, every predetermined number of times the door is unlocked, or every predetermined operating time of the object detection device 10, and is recorded in the storage unit 60 as a reference value for calculating income data. May be done. Further, since the CSI data changes to some extent due to the movement and breathing of the passenger at the time of boarding, it may be determined that the person is unmanned when the CSI data is observed for a certain period of time and there is no change.

Next, as a radio wave intensity information acquisition step, the control unit 70 acquires the CSI curve when the passenger boarded the cabin CA (step S102). This process may be performed, for example, by confirming the start of the engine of the automobile M or the start of the automobile M.

Next, the control unit 70 calculates a difference curve obtained by subtracting the CSI curve when the passenger gets in the cabin CA from the CSI curve when the cabin CA is unmanned (step S103). As the CSI curve when the guest room CA is unmanned, the CSI curve acquired each time the determination flow RT1 is executed as described above may be used for calculating the difference curve, or may be acquired in advance and stored in the storage unit 60. The reference value recorded in the above may be read out and used for calculating the difference curve.

Next, the control unit 70 extracts a numerical value of a predetermined carrier number from the calculated difference curve (step S104).

Next, the control unit 70 calculates the sum of the absolute values of the numerical values of the predetermined carrier numbers extracted from the difference curve, and selects and acquires the paths used for the determination data in descending order of the sum of the absolute values. It is used as data (step S105).

Next, the control unit 70 reads out the determination table recorded in the storage unit 60, and compares the acquired data with the determination data of the path and the carrier number of the determination table (step S106).

Next, as a detection step, the control unit 70 searches for judgment data indicating the same as the acquired data or within a predetermined numerical range from the judgment data in the judgment table, and determines the boarding state of the occupant from the judgment data that matches the conditions. Determine (step S107). Further, the control unit 70 displays the determination result on the console 17.

By the above processing, it is possible to determine the boarding state of the passenger from the CSI curve acquired when the cabin CA is unmanned and the CSI curve acquired when the passenger boarded the cabin CA.

As described above, the control unit 70 uses the CSI curve as a reference value when there is no crew member to be detected inside the cabin CA.

Further, as described above, the object detection method of the object detection device 10 is an object detection device including a transmission unit 13 having a plurality of transmission antennas 13A and 13B and a reception unit 15 having a plurality of reception antennas 15A, 15B and 15C. Reference numeral 10 denotes an object detection method for detecting a crew member of the cabin CA, in which the radio wave intensity of each of the radio wave signals transmitted from each of the plurality of transmitting antennas 13A and 13B in each of the plurality of receiving antennas 15A, 15B and 15C is determined. It has a radio wave intensity information acquisition step for acquiring the indicated CSI curve, and a detection step for detecting a crew member in the cabin CA based on the difference between the radio wave intensity indicated by the CSI curve and the CSI curve when the cabin CA is unmanned.

Next, the determination data for determining the number of passengers and the boarding position in the cabin CA will be described.

FIG. 9 is a diagram showing an example of a determination table used for determining the boarding state of the occupant of the object detection device 10 according to the embodiment of the present application.

As described above, the determination table is recorded in the storage unit 60, and is read out when the control unit 70 determines the boarding state from the acquired data. The determination table may be recorded in the storage unit 60 at the time of product shipment, or data may be generated by the user after the product is shipped.

In the judgment table, for example, only the driver is seated in the driver's seat DS, the driver is seated in the driver's seat DS and the passenger is seated in the passenger seat PS, or the driver is for the driver. All paths and carrier number values of the difference curve of the pattern in which the passenger can be seated in the cabin CA of the automobile M, such as the passenger being seated on the seat DS and on the left side of the rear seat RS, are recorded. Has been done. In this embodiment, a case where all the paths of the difference curve of the pattern in which the passenger can be seated and the numerical values of all the carrier numbers are recorded in the determination table will be described. However, the recorded contents of the judgment table are not limited to this. Specifically, for example, a predetermined path and carrier number may be set in advance and only the numerical values of the predetermined path and carrier number may be recorded. Further, a predetermined quantity may be automatically selected and recorded from the maximum value, the minimum value, the carrier number in the middle of the carrier number indicating the maximum value and the minimum value, and the maximum value and the minimum value of the difference curve.

FIG. 10 is a generation flow RT2 for generating a determination table of the object detection device 10 according to the embodiment of the present application.

First, the control unit 70 acquires the CSI curve when the cabin CA is unmanned (step S201). This process may be performed, for example, by confirming that the door lock of the automobile M has been released.

Next, the control unit 70 determines whether or not the seating position of the crew member has been input (step S202). This determination may be made, for example, based on whether or not the boarding status of the crew member has been input on the console 17.

Next, the control unit 70 acquires the CSI curve when the passenger boarded the cabin CA (step S203). This process may be automatically executed after the process of step S202 is executed, or may be executed when an instruction operation for starting acquisition is input on the console 17.

Next, the control unit 70 calculates a difference curve obtained by subtracting the CSI curve when the passenger gets in the cabin CA from the CSI curve when the cabin CA is unmanned (step S204).

Next, the control unit 70 records in the storage unit 60 so that the calculated numerical values of each path of the difference curve and each carrier number are added to the determination table as determination data.

By repeatedly executing the above generation flow RT2 for the number of patterns in which the passenger can be seated in the cabin CA, it is possible to generate a judgment table for judging the boarding state when the passenger actually boarded. It becomes.

The generation flow RT2 may be executed by the manufacturer before the product is shipped and recorded in the storage unit 60, or the determination table may be generated by the user after the product is shipped.

Next, feedback of the determination result by the user when the object detection device 10 cannot determine the boarding state of the occupant by comparing the acquired data with the determination table or when the determined occupant's boarding state is incorrect. Will be described.

FIG. 11 is a determination flow RT3 in the case of feeding back the determination result of the object detection device 10 according to the embodiment of the present application.

Further, FIG. 12 is a determination condition change flow RT4 in which the determination condition is changed depending on the pros and cons of the boarding state of the passenger determined by the object detection device 10 according to the embodiment of the present application.

The determination flow RT3 in FIG. 11 is the same as the determination flow RT1 shown in FIG. 8, and steps S301 to S306 of the determination flow RT3 of FIG. 11 correspond to steps S101 to S106 of the determination flow RT1 of FIG. The description of the overlapping portion of the processes of steps S301 to S306 will be omitted.

In step S306, the control unit 70 reads out the determination table recorded in the storage unit 60 and compares the acquired data with the path of the determination table and the determination data of the carrier number (step S306).

Next, in FIG. 12, the control unit 70 determines whether the acquired data matches any of the determination data in the determination table in the process executed in step S306 of FIG. 11 (step S401).

If it is not determined that the acquired data matches any of the determination data in the determination table (step S401: No), the control unit 70 causes the console 17 to display to input the actual boarding status of the passenger, and the console 17 displays. It is determined whether the boarding state has been input (step S402).

In step S402, if it is not determined that the boarding state has been input on the console 17 (step S402: No), the control unit 70 determines that the acquired data and the determination data do not match, and ends the determination condition change flow RT4. It should be noted that this process may be determined based on the fact that the console 17 has not been input for a certain period of time, or the console 17 is displayed with a selection to execute the cancel process, and the cancel process is selected on the console 17. May be determined.

Further, in step S402, when it is determined that the actual boarding state has been input on the console 17 (step S402: Yes), the control unit 70 sets the numerical values in all the paths and all the carrier numbers of the acquired difference CSI curve. The data of the boarding state of the passenger input by the user is linked, and the judgment data of the boarding state entered in the judgment table is recorded in the storage unit 60 so as to be updated to the numerical value of the difference CSI curve acquired this time. (Step S403). As a result, after the next determination, the boarding status of the occupant is determined based on the updated determination data. Further, the determination data may be updated even after the next determination.

Further, in step S401, when it is determined that the acquired data matches any of the determination data in the determination table (step S401: Yes), the control unit 70 selects whether the boarding state determined by the console 17 is correct. It is displayed, and it is determined whether or not the boarding state is input to be correct on the console 17 (step S404).

When it is determined in step S404 that the boarding state determined on the console 17 is input to be correct (step S404: Yes), the control unit 70 ends the determination condition change flow RT4.

Further, in step S404, when the user inputs that the determined boarding state is incorrect (step S404: No), the control unit 70 causes the console 17 to display to input the actual boarding state of the occupant. , It is determined whether the boarding state is input on the console 17 (step S405).

If it is not determined in step S405 that the boarding state has been input by the user (step S405: No), the control unit 70 determines that the acquired data and the determination data do not match, and ends the determination condition change flow RT4. It should be noted that this process may be determined based on the fact that the console 17 has not been input for a certain period of time, or the console 17 is displayed with a selection to execute the cancel process, and the cancel process is selected on the console 17. May be determined.

Further, in step S405, when it is determined that the actual boarding state has been input on the console 17 (step S405: Yes), the control unit 70 sets the numerical values in all the paths and all the carrier numbers of the acquired difference CSI curve. The data of the boarding state of the passenger input by the user is linked, and the judgment data of the boarding state entered in the judgment table is recorded in the storage unit 60 so as to be updated to the numerical value of the difference CSI curve acquired this time. (Step S406). As a result, after the next determination, the boarding status of the occupant is determined based on the updated determination data. Further, the determination data may be updated even after the next determination.

Next, the control unit 70 adds an update flag indicating that an update is required to the boarding state determination data that has been erroneously determined (step S407). The boarding state determination data is temporarily used until the CSI curve of the boarding state is newly acquired after the next determination or the generation flow RT2 shown in FIG. 10 is newly executed by the user. It may be displayed on the console 17 that the determination data of the boarding state needs to be updated after not being used for the determination.

By executing the above processing, it is possible to improve the determination accuracy of the boarding state by changing the determination condition depending on the pros and cons of the boarding state of the passenger determined by the object detection device 10.

The determination condition change flow RT4 may be continuously executed after step S306 of the determination flow RT3 shown in FIG. 11, or may be executed when the vehicle M is stopped, the engine is stopped, or the like.

Further, the normal mode for executing the determination flow RT1 of FIG. 8 and the feedback mode for executing the determination flow RT3 and the determination condition change flow RT4 of FIGS. 11 and 12 may be freely switched. Further, it may be automatically executed only when the acquired data does not match the judgment data in the judgment table.

According to this embodiment, it is possible to provide an object detection device capable of determining the boarding state of a occupant in an automobile without attaching a dedicated device to each seat.

In this embodiment, an object detection device 10 for transmitting and receiving radio waves by arranging a transmitting unit 13 and a receiving unit 15 having a plurality of antennas at one end in the passenger cabin CA of the automobile M and the other end facing the other will be described. bottom. However, the arrangement of the transmitting unit 13 and the receiving unit 15 is not limited to this. For example, the directivity of the plurality of antennas of the transmitting unit 13 and the receiving unit 15 is directed to the opposite direction as an integrated transmitting / receiving device, and the integrated transmitting / receiving device is arranged, for example, in the central portion of the guest room CA. May be good.

Further, in the present embodiment, the object detection device 10 is described in which the object detection device 10 is mounted in the passenger cabin CA of the automobile M and determines which seat the occupant is seated in. However, the object detection device 10 can also be used for detecting an object in a place other than the passenger compartment of the automobile. Specifically, for example, the object detection device 10 may be installed in a private room such as a conference room to grasp the seating status and the vacant seat status of the private room. In addition, it may be installed at a restaurant and used to grasp the availability of seats in the store. In addition, audio adjustment and the like may be performed using the information on the seating status or the vacant seat status. Further, the object detection device 10 can be applied to various moving objects including a guest room such as a bus, a train, or an airplane, for example.

Further, in the present embodiment, the object detection device 10 for determining which seat the crew member is seated in has been described. However, the target to be detected is not limited to humans. The object detection device 10 may be used to detect, for example, luggage or the like carried into the guest room CA.

Further, in this embodiment, the object detection device 10 for acquiring information on the radio wave intensity of CSI has been described. However, the acquired CSI information is not limited to the radio field strength. Specifically, for example, the same thing as in this embodiment can be realized by using the phase change of the radio wave obtained as CSI.

10 Object detection device 13 Transmission unit 15 Reception unit 17 Console 19 System bus 20 Output unit 30 Input unit 40 Display output unit 50 Operation reception unit 60 Storage unit 70 Control unit

Claims (8)

A radio wave transmitter having a plurality of transmitting antennas arranged at one location in a closed space and transmitting a transmitted wave through each of the plurality of transmitting antennas.
A radio wave receiving unit having a plurality of receiving antennas arranged in other parts of the closed space and receiving the transmitted wave via each of the plurality of receiving antennas.
A radio wave intensity information acquisition unit that acquires radio wave intensity information indicating the radio wave intensity of each of the transmitted waves transmitted from each of the plurality of transmitting antennas in each of the plurality of receiving antennas.
An object detection device comprising a detection unit that detects an object in the closed space based on a difference between the radio wave intensity indicated by the radio wave intensity information and a predetermined reference intensity. The object detection device according to claim 1, wherein the transmitted wave is a transmitted wave including a carrier wave having a plurality of bands. The object detection device according to claim 1 or 2, wherein the detection unit uses the propagation path information as a reference value when there is no object to be detected inside the closed space. The radio wave intensity information is transmitted through each of the plurality of transmitting antennas, and the radio wave for each of the plurality of bands in each of the plurality of propagation paths of the transmitted wave received via each of the plurality of receiving antennas. The object detection device according to any one of claims 1 to 3, wherein each has a CSI curve indicating an intensity. The radio wave transmitting unit is arranged at one end of the closed space.
The object detection device according to claim 1, wherein the radio wave receiving unit is arranged at the other end of the closed space facing the one end. An object detection method in which an object detection device including a radio wave transmitting unit having a plurality of transmitting antennas and a radio wave receiving unit having a plurality of receiving antennas detects an object in a closed space.
A radio wave intensity information acquisition step of acquiring radio wave intensity information indicating the radio wave intensity of each of the transmitted waves transmitted from each of the plurality of transmitting antennas in each of the plurality of receiving antennas, and a radio wave intensity information acquisition step.
An object detection method comprising: a detection step of detecting an object in the closed space based on a difference between a radio wave intensity indicated by the radio wave intensity information and a predetermined reference intensity. An object detection program executed by an object detection device provided in a computer.
A radio wave intensity information acquisition step of acquiring radio wave intensity information indicating the radio wave intensity of each of the transmitted waves transmitted from each of the plurality of transmitting antennas in each of the plurality of receiving antennas, and a radio wave intensity information acquisition step.
An object detection program characterized by executing a detection step of detecting an object in the closed space based on a difference between the radio wave intensity indicated by the radio wave intensity information and a predetermined reference intensity. A computer-readable recording medium comprising storing the moving image generation program according to claim 7.

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