JP2019203784A - Distance measuring system - Google Patents

Distance measuring system Download PDF

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Publication number
JP2019203784A
JP2019203784A JP2018098807A JP2018098807A JP2019203784A JP 2019203784 A JP2019203784 A JP 2019203784A JP 2018098807 A JP2018098807 A JP 2018098807A JP 2018098807 A JP2018098807 A JP 2018098807A JP 2019203784 A JP2019203784 A JP 2019203784A
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Prior art keywords
communication
vehicle
open
ranging
opening
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佳之 大屋
Yoshiyuki Oya
佳之 大屋
一輝 内木
Kazuteru Uchiki
一輝 内木
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Tokai Rika Co Ltd
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Tokai Rika Co Ltd
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Priority to JP2018098807A priority Critical patent/JP2019203784A/en
Priority to DE112019002570.8T priority patent/DE112019002570T5/en
Priority to PCT/JP2019/019283 priority patent/WO2019225431A1/en
Publication of JP2019203784A publication Critical patent/JP2019203784A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

Abstract

To provide a distance measuring system that can ensure the communication performance of indoor ranging communication regardless of an open or closed state of an opening.SOLUTION: Two vehicle anchors 11 and 12 for transmitting and receiving ranging signals in a UWB band are installed in a passenger compartment. When a door is closed, only the vehicle anchor 11 is used and UWB communication (indoor ranging communication) with a portable device 2 is performed with the one vehicle anchor 11. On the other hand, when the door is open, since an effect of multipath cannot be expected, the vehicle anchor 12 is also used in addition to the vehicle anchor 11, and UWB communication (indoor ranging communication) with the portable device 2 is performed with the plurality of vehicle anchors 11 and 12.SELECTED DRAWING: Figure 2

Description

本発明は、通信機と通信対象との間で距離を測定する距離測定システムに関する。   The present invention relates to a distance measuring system that measures a distance between a communication device and a communication target.

従来、例えば車両において、ユーザーに所持される電子キーと車両に搭載される車載機との間の無線通信を通じて車両の制御を行う電子キーシステムが知られている。電子キーシステムとしては、電子キーが自動で応答して無線通信によりＩＤ照合を行うスマート照合システムが周知である。   2. Description of the Related Art Conventionally, for example, in a vehicle, an electronic key system that controls a vehicle through wireless communication between an electronic key possessed by a user and an in-vehicle device mounted on the vehicle is known. As an electronic key system, a smart verification system in which an electronic key automatically responds and performs ID verification by wireless communication is well known.

ところで、この種の電子キーシステムにおいては、正規電子キーを所持したユーザーの意志によらない所でＩＤ照合成立を謀る行為として、中継器を使った不正行為がある。中継器を使った不正行為は、例えば電子キーが車両から遠い場所に位置する場合に、複数の中継器によって車載機及び電子キーの間の通信を中継し、ＩＤ照合を不正に成立させる行為である。よって、正規電子キーを所持したユーザーが気付かないところでＩＤ照合が成立されてしまうおそれがあった。   By the way, in this kind of electronic key system, there is a fraudulent act using a repeater as an attempt to establish ID collation without depending on the will of the user who possesses the regular electronic key. A fraudulent act using a repeater is an act of relaying communication between an in-vehicle device and an electronic key by a plurality of repeaters, for example, when the electronic key is located far from the vehicle, and illegally establishing ID verification. is there. Therefore, there is a possibility that the ID collation is established where the user who has the regular electronic key does not notice.

このような中継器を使った不正行為に対して、特許文献１には、車両と電子キーとの距離を測定して不正行為を検出する技術が開示されている。この場合、車載機と電子キーとの間でＵＷＢ帯（ＵＷＢ：Ｕｌｔｒａ Ｗｉｄｅ Ｂａｎｄ）の測距信号を相互に送受信し、その測距信号を解析することにより車両と電子キーとの距離を測定する。よって、中継器が介在する場合には測距信号の到達時間が長くなり、測定された距離が閾値よりも大きくなる。そのため、不正行為を検出できる。   With respect to the fraud using such a repeater, Patent Document 1 discloses a technique for detecting the fraud by measuring the distance between the vehicle and the electronic key. In this case, a distance measurement signal in the UWB band (UWB: Ultra Wide Band) is transmitted and received between the in-vehicle device and the electronic key, and the distance between the vehicle and the electronic key is measured by analyzing the distance measurement signal. . Therefore, when the repeater is interposed, the arrival time of the distance measurement signal becomes longer, and the measured distance becomes larger than the threshold value. Therefore, cheating can be detected.

特開２０１４−２２７６４７号公報JP 2014-227647 A

車室内のＵＷＢ通信において、ドア閉のときは、反射によるマルチパスの影響を期待できるため、通信性能に優位に働く。これに対し、ドア開或いは窓開のときは、マルチパスの影響を期待できなくなるので、ドア閉のときよりも通信性能の低下が懸念される。   In UWB communication in the passenger compartment, when the door is closed, the influence of multipath due to reflection can be expected, so that it has an advantage in communication performance. On the other hand, since the influence of multipath cannot be expected when the door is opened or the window is opened, there is a concern that the communication performance will be lower than when the door is closed.

本発明は、このような問題点に着目してなされたものであって、その目的は、開口部の開閉状態にかかわらず室内測距通信の通信性能の確保を可能にした距離測定システムを提供することにある。   The present invention has been made paying attention to such problems, and its purpose is to provide a distance measuring system that can ensure the communication performance of indoor ranging communication regardless of the open / closed state of the opening. There is to do.

上記課題を解決する距離測定システムは、室内に設けられる通信機とその通信機の通信対象との間で測距信号を相互に送受信する室内測距通信を行い、その測距信号を解析することにより通信機と通信対象との距離を測定する距離測定システムにおいて、開口部の開閉状態を検出する開閉センサと、前記開閉センサによって検出された開口部の開閉状態に応じて、室内測距通信に使用する通信機の数を設定する設定手段とを備える。   A distance measurement system that solves the above problems performs indoor distance measurement communication between a communication device installed in a room and a communication target of the communication device, and analyzes the distance measurement signal. In the distance measurement system that measures the distance between the communication device and the communication target, the open / close sensor that detects the open / closed state of the opening, and the indoor ranging communication according to the open / closed state of the opening detected by the open / close sensor. Setting means for setting the number of communication devices to be used.

この構成によれば、開口部の開閉状態に応じた数の通信機が使用されつつ、通信対象との間で室内測距通信が行われる。したがって、開口部の開閉状態にかかわらず室内測距通信の通信性能を確保できる。   According to this configuration, indoor ranging communication is performed with the communication target while the number of communication devices corresponding to the open / closed state of the opening is used. Therefore, the communication performance of indoor ranging communication can be ensured regardless of the open / closed state of the opening.

上記距離測定システムについて、前記設定手段は、開口部が開状態のときは、開口部が閉状態のときよりも室内測距通信に使用する通信機の数を多く設定することとしてもよい。   In the distance measuring system, the setting unit may set a larger number of communication devices used for indoor ranging communication when the opening is in the open state than when the opening is in the closed state.

この構成によれば、開口部が開状態のときは、反射によるマルチパスの影響を期待できなくなる点を踏まえ、閉状態のときよりも多くの通信機が使用され、これにより、通信性能を補足できる。   According to this configuration, when the opening is in the open state, more communication devices are used than in the closed state because the multipath effect due to reflection cannot be expected. it can.

本発明によれば、開口部の開閉状態にかかわらず室内測距通信の通信性能を確保できる。   ADVANTAGE OF THE INVENTION According to this invention, the communication performance of indoor ranging communication is securable irrespective of the opening / closing state of an opening part.

距離測定システムが適用される車両の構成を示すブロック図。The block diagram which shows the structure of the vehicle to which a distance measurement system is applied. 室内のＵＷＢ通信を示す模式図であって、（ａ）はドア閉時の模式図、（ｂ）はドア開時の模式図。It is a schematic diagram which shows indoor UWB communication, Comprising: (a) is a schematic diagram at the time of a door closing, (b) is a schematic diagram at the time of a door opening.

以下、距離測定システムの一実施の形態について説明する。
図１に示すように、車両１の室内には、ＵＷＢ帯の測距信号を送受信する２つの車両アンカー１１、１２が設置されている。車両アンカー１１は平面視で例えば車室内中央位置に設けられ、車両アンカー１２は平面視で例えば車室内前寄り位置に設けられている。尚、車両アンカー１１、１２の搭載位置はこれに限らず任意である。車両アンカー１１、１２は共に通信機に相当する。 Hereinafter, an embodiment of the distance measurement system will be described.
As shown in FIG. 1, two vehicle anchors 11 and 12 for transmitting and receiving a UWB band ranging signal are installed in the vehicle 1. The vehicle anchor 11 is provided, for example, at a vehicle interior center position in plan view, and the vehicle anchor 12 is provided, for example, at a position closer to the vehicle interior front in plan view. The mounting positions of the vehicle anchors 11 and 12 are not limited to this and are arbitrary. Both the vehicle anchors 11 and 12 correspond to communication devices.

また、車両１には、測距信号を用いた室内測距通信（ＵＷＢ通信）を統括的に制御する車載コントローラ１０の他、対応するドアの開閉状態を検出する開閉センサ１３〜１６が設けられている。開閉センサ１３は運転席のドアの開閉状態を検出し、開閉センサ１４は助手席のドアの開閉状態を検出し、開閉センサ１５は後部左側座席のドアの開閉状態を検出し、開閉センサ１６は後部右側座席のドアの開閉状態を検出する。尚、それぞれのドアはいずれも車体開口部を開閉する開閉体に相当する。   In addition, the vehicle 1 is provided with opening / closing sensors 13 to 16 that detect the open / closed state of the corresponding door, in addition to the in-vehicle controller 10 that comprehensively controls indoor ranging communication (UWB communication) using ranging signals. ing. The open / close sensor 13 detects the open / close state of the driver's seat door, the open / close sensor 14 detects the open / close state of the passenger seat door, the open / close sensor 15 detects the open / close state of the rear left seat door, and the open / close sensor 16 The open / close state of the rear right seat door is detected. Each door corresponds to an opening / closing body that opens and closes the vehicle body opening.

車載コントローラ１０は、測距開始条件の成立を契機に、室内測距通信を開始する。測距開始条件成立の一例は、ユーザーによるエンジン始動スイッチの操作時である。車載コントローラ１０は、測距開始条件が成立すると、開閉センサ１３〜１６によって検出されたそれぞれのドアの開閉状態に応じて、室内測距通信に使用する車両アンカー（１１、１２）の数を設定する。車載コントローラ１０は設定手段に相当する。   The in-vehicle controller 10 starts indoor ranging communication when the ranging start condition is satisfied. One example of satisfying the distance measurement start condition is when the user operates the engine start switch. When the ranging start condition is satisfied, the in-vehicle controller 10 sets the number of vehicle anchors (11, 12) used for indoor ranging communication according to the open / closed state of each door detected by the open / close sensors 13-16. To do. The in-vehicle controller 10 corresponds to setting means.

詳述すると、車載コントローラ１０は、全てのドアが閉状態のときは車両アンカー１１のみを選択し、この車両アンカー１１から測距信号を送信する。一方、いずれかのドアが開状態のときは車両アンカー１１、１２の双方を選択し、まず車両アンカー１１から測距信号を送信して室内測距通信が確立した場合は車両アンカー１２から測距信号を送信せず、車両アンカー１１から測距信号を送信したにもかかわらず室内測距通信が確立しなかった場合は車両アンカー１２から測距信号を送信する。これは、全てのドアが閉状態のときは、反射によるマルチパスの影響を期待できるため、通信性能に優位に働くが、いずれかのドアが開状態のときは、マルチパスの影響を期待できなくなる点を考慮してのことである。車載コントローラ１０は、いずれかの車体開口部が開状態のときは、全ての車体開口部が閉状態のときよりも室内測距通信に使用する車両アンカー（１１、１２）の数を多く設定していることになる。   More specifically, the in-vehicle controller 10 selects only the vehicle anchor 11 and transmits a distance measurement signal from the vehicle anchor 11 when all the doors are closed. On the other hand, when one of the doors is open, both of the vehicle anchors 11 and 12 are selected. When the ranging signal is first transmitted from the vehicle anchor 11 and the indoor ranging communication is established, the ranging from the vehicle anchor 12 is performed. When the ranging signal is not transmitted but the ranging signal is transmitted from the vehicle anchor 11 but the indoor ranging communication is not established, the ranging signal is transmitted from the vehicle anchor 12. This is advantageous for communication performance when all doors are in the closed state, so it can be expected to have an effect on multipath when any door is open. Considering the point of disappearance. The in-vehicle controller 10 sets a larger number of vehicle anchors (11, 12) used for indoor ranging communication when any vehicle body opening is in an open state than when all vehicle body openings are in a closed state. Will be.

ところで、車両キーとしてユーザーに所持される携帯機２は、自キーを統括的に制御するキー制御部２０の他、ＵＷＢ帯の測距信号を送受信するＵＷＢ通信部２１を備えている。キー制御部２０は、ＵＷＢ通信部２１によって測距信号を受信すると、その測距信号をＵＷＢ通信部２１によって車両１に送り返す。この測距信号が車両アンカー１１、１２によって受信されると、車載コントローラ１０は、車両アンカー１１、１２を通じて測距信号を送信してから車両アンカー１１、１２によって測距信号を受信するまでの時間を基に、車両アンカー１１、１２（共に通信機）と携帯機２（通信機の通信対象）との距離を測定する。そして、車載コントローラ１０は、例えば周知のＩＤ照合が成立し、且つ、測定した距離が閾値以下であることを条件に、エンジンを始動する。車載コントローラ１０を有する車両１と携帯機２とにより電子キーシステム３が構築され、この電子キーシステム３が距離測定システムの一例である。   By the way, the portable device 2 possessed by the user as a vehicle key includes a UWB communication unit 21 that transmits and receives a ranging signal in the UWB band, in addition to a key control unit 20 that comprehensively controls the own key. When the key control unit 20 receives the ranging signal by the UWB communication unit 21, the key control unit 20 sends the ranging signal back to the vehicle 1 by the UWB communication unit 21. When this ranging signal is received by the vehicle anchors 11, 12, the in-vehicle controller 10 is the time from when the ranging signal is transmitted through the vehicle anchors 11, 12 until the ranging signal is received by the vehicle anchors 11, 12. The distance between the vehicle anchors 11 and 12 (both communication devices) and the portable device 2 (the communication target of the communication device) is measured. And the vehicle-mounted controller 10 starts an engine on condition that the well-known ID collation is materialized and the measured distance is below a threshold value, for example. An electronic key system 3 is constructed by the vehicle 1 having the in-vehicle controller 10 and the portable device 2, and this electronic key system 3 is an example of a distance measuring system.

次に、距離測定システムの作用について説明する。
図２（ａ）に示すように、全てのドアが閉状態の通常時は、車両アンカー１１のみを使用して、１つの車両アンカー１１で携帯機２とＵＷＢ通信（室内測距通信）を行う。尚、通常時は、反射によるマルチパスの影響を期待できるため、車両アンカー１１と携帯機２との間でＵＷＢ通信が確立し、車両アンカー１１と携帯機２との距離を測定できることになる。 Next, the operation of the distance measurement system will be described.
As shown in FIG. 2A, when all the doors are normally closed, only the vehicle anchor 11 is used and UWB communication (indoor ranging communication) is performed with the portable device 2 using the single vehicle anchor 11. . In addition, since the influence of multipath due to reflection can be expected in normal times, UWB communication is established between the vehicle anchor 11 and the portable device 2 and the distance between the vehicle anchor 11 and the portable device 2 can be measured.

一方、図２（ｂ）に示すように、４枚のドア全てが開状態にあるときのようなドア開時は、マルチパスの影響を期待できなくなるので、車両アンカー１１の他、車両アンカー１２も使用して、複数の車両アンカー１１、１２で携帯機２とＵＷＢ通信（室内測距通信）を行う。これにより、車両アンカー１１と携帯機２との間でＵＷＢ通信が確立しなかった場合でも、車両アンカー１２と携帯機２との間でＵＷＢ通信が確立すれば、車両アンカー１２と携帯機２との距離を測定できることになる。   On the other hand, as shown in FIG. 2 (b), when the doors are open such as when all four doors are open, the influence of multipath cannot be expected. Are also used to perform UWB communication (indoor ranging communication) with the portable device 2 using the plurality of vehicle anchors 11 and 12. Thereby, even if UWB communication is not established between the vehicle anchor 11 and the portable device 2, if UWB communication is established between the vehicle anchor 12 and the portable device 2, the vehicle anchor 12 and the portable device 2 Can be measured.

以上説明したように、本実施の形態によれば、以下の効果を奏することができる。
（１）ドアの開閉状態に応じた数の車両アンカー（１１、１２）が使用されつつ、携帯機２との間で室内測距通信（ＵＷＢ通信）が行われる。したがって、ドアの開閉状態にかかわらず室内測距通信の通信性能を確保できる。 As described above, according to the present embodiment, the following effects can be obtained.
(1) Indoor ranging communication (UWB communication) is performed with the portable device 2 while the number of vehicle anchors (11, 12) corresponding to the open / closed state of the door is used. Therefore, the communication performance of indoor ranging communication can be ensured regardless of the open / closed state of the door.

（２）ドアが開状態のときは、反射によるマルチパスの影響を期待できなくなる点を踏まえ、閉状態のときよりも多くの車両アンカー（１１、１２）が使用され、これにより、通信性能を補足できる。   (2) When the door is in the open state, more vehicle anchors (11, 12) are used than in the closed state in consideration of the point that the influence of multipath due to reflection cannot be expected. Can be supplemented.

（３）ドアの開閉状態に関係なく常に複数の車両アンカー１１、１２と携帯機２で通信を行うシステムとは異なり、一時的に車両アンカー（１１、１２）の数を増やすシステムのため、消費電流の増加を必要最低限にできる。   (3) Unlike the system that always communicates with the plurality of vehicle anchors 11 and 12 and the portable device 2 regardless of the open / closed state of the door, it is consumed because the system temporarily increases the number of vehicle anchors (11 and 12). Increase in current can be minimized.

尚、上記実施の形態は、次のように変更して具体化することも可能である。
・ドア閉時に使用する車両アンカーの数を１個、ドア開時に使用する車両アンカーの数を２個とする構成に代えて、ドア閉時に使用する車両アンカーの数を複数（便宜上Ｘ個）、ドア開時に使用する車両アンカーの数を「Ｘ＋α」個（α＝１、２、…）としてもよい。 It should be noted that the above embodiment can be modified and embodied as follows.
・ Instead of the configuration in which the number of vehicle anchors used when the door is closed is one and the number of vehicle anchors used when the door is opened is two, the number of vehicle anchors used when the door is closed is plural (for convenience, X), The number of vehicle anchors used when the door is opened may be “X + α” (α = 1, 2,...).

・車室内に例えば３個の車両アンカーを有し、４枚のドアが全て閉状態のときは１個の車両アンカーを使用する一方、いずれか１枚又は２枚のドアが開状態のときは２個の車両アンカーを使用する他方、３枚以上のドアが開状態のときは３個の車両アンカーを使用する構成を採用してもよい。   ・ For example, there are three vehicle anchors in the passenger compartment. When all four doors are closed, one vehicle anchor is used. When either one or two doors are open, On the other hand, when two vehicle anchors are used, a configuration using three vehicle anchors may be employed when three or more doors are open.

・車両１には通常、ドアによって開閉される車体開口部の他、ドアガラス（窓ガラス）或いはトランク或いはサンルーフによって開閉される開口部が存在する。それら窓等の開閉状態を、対応する開閉センサで検出し、全ての開口部が閉状態のときは１個の車両アンカー１１を使用する一方、いずれかの開口部が開状態のときは２個の車両アンカー１１、１２を使用する構成を採用してもよい。   The vehicle 1 usually has an opening that is opened and closed by a door glass (window glass), a trunk, or a sunroof, in addition to a vehicle body opening that is opened and closed by a door. The open / closed state of these windows and the like is detected by the corresponding open / close sensor. When all the openings are closed, one vehicle anchor 11 is used, while when any of the openings is open, two You may employ | adopt the structure which uses the vehicle anchors 11 and 12 of these.

・車両１に代えて建物の室内に設けられる通信機とその通信機の通信対象との間で測距信号を相互に送受信する室内測距通信を行い、その測距信号を解析することにより通信機と通信対象との距離を測定する距離測定システムに本発明を適用してもよい。   ・ Communication is performed by performing indoor distance measurement communication between the communication device provided in the room of the building instead of the vehicle 1 and the communication target of the communication device, and transmitting and receiving distance measurement signals to each other and analyzing the distance measurement signal The present invention may be applied to a distance measurement system that measures the distance between a machine and a communication target.

・室内の広さや形状や障害物の有無等の他、開口部の大きさや形状や位置や個数等との兼ね合いで、ＵＷＢ帯とは異なる別の周波数帯の電波を測距信号として用いてもよい。
・車両アンカー１１による測距信号の送信出力に対し、車両アンカー１２による測距信号の送信出力は同じであってもよいし、異なっていてもよい。尚、３個以上の車両アンカーを有する構成において、個別に測距信号の送信出力を設定してもよい。 ・ In addition to the size, shape, position, number, etc. of the opening, in addition to the size and shape of the room and the presence or absence of obstacles, radio waves in a different frequency band from the UWB band may be used as the ranging signal. Good.
The transmission output of the distance measurement signal by the vehicle anchor 12 may be the same as or different from the transmission output of the distance measurement signal by the vehicle anchor 11. In the configuration having three or more vehicle anchors, the transmission output of the ranging signal may be set individually.

１…車両、２…携帯機（通信対象）、３…電子キーシステム（距離測定システム）、１０…車載コントローラ（設定手段）、１１，１２…車両アンカー（通信機）、１３〜１６…開閉センサ、２０…キー制御部、２１…ＵＷＢ通信部。   DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Portable machine (communication object), 3 ... Electronic key system (distance measuring system), 10 ... In-vehicle controller (setting means), 11, 12 ... Vehicle anchor (communication device), 13-16 ... Opening / closing sensor , 20 ... key control unit, 21 ... UWB communication unit.

Claims (2)

室内に設けられる通信機とその通信機の通信対象との間で測距信号を相互に送受信する室内測距通信を行い、その測距信号を解析することにより通信機と通信対象との距離を測定する距離測定システムにおいて、
開口部の開閉状態を検出する開閉センサと、
前記開閉センサによって検出された開口部の開閉状態に応じて、室内測距通信に使用する通信機の数を設定する設定手段とを備える
距離測定システム。 Performs indoor ranging communication that transmits and receives ranging signals between a communication device installed in the room and the communication target of the communication device, and analyzes the ranging signal to determine the distance between the communication device and the communication target. In the distance measurement system to measure,
An opening / closing sensor for detecting an opening / closing state of the opening;
A distance measuring system comprising: setting means for setting the number of communication devices used for indoor ranging communication according to the open / closed state of the opening detected by the open / close sensor. 前記設定手段は、開口部が開状態のときは、開口部が閉状態のときよりも室内測距通信に使用する通信機の数を多く設定する
請求項１に記載の距離測定システム。 The distance measurement system according to claim 1, wherein the setting unit sets a larger number of communication devices used for indoor ranging communication when the opening is in the open state than when the opening is in the closed state.
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