JP2021076877A - Pedestrian terminal, on-vehicle terminal, and driving support system - Google Patents

Pedestrian terminal, on-vehicle terminal, and driving support system Download PDF

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JP2021076877A
JP2021076877A JP2019200355A JP2019200355A JP2021076877A JP 2021076877 A JP2021076877 A JP 2021076877A JP 2019200355 A JP2019200355 A JP 2019200355A JP 2019200355 A JP2019200355 A JP 2019200355A JP 2021076877 A JP2021076877 A JP 2021076877A
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pedestrian
pedestrian terminal
terminal
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加藤　学
Manabu Kato
加藤　　学
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Katoh Electrical Machinery Co Ltd
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Katoh Electrical Machinery Co Ltd
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Abstract

To suppress the power consumption of a pedestrian terminal 1 carried by a pedestrian to avoid collision between the pedestrian and a vehicle.SOLUTION: A pedestrian terminal 1, which is carried by a pedestrian, comprises a transmission unit 4 for transmitting a signal by wireless and a control unit 5 for controlling the signal transmission by the transmission unit 4. The pedestrian terminal 1 also comprises a sensing unit 6 for generating a signal when sensing the spatial movement of the pedestrian terminal 1. The sensing unit 6, the control unit 5, and the transmission unit 4, which are mounted on the pedestrian terminal 1, move as one piece while the pedestrian moves carrying the pedestrian terminal 1. The control unit 5 detects a level of the spatial movement of the pedestrian terminal 1 based on the signal generated by the sensing unit 6. The higher the level of the spatial movement of the pedestrian terminal 1 is, the more the control unit increases the frequency of occurrence of transmitting signals using the transmission unit 4. In this way, the power consumption of the pedestrian terminal 1 can be suppressed.SELECTED DRAWING: Figure 1

Description

本開示は、主に歩行者端末に関する。 The present disclosure mainly relates to pedestrian terminals.

従来より、歩行者と車両との衝突を回避するため、次のようなシステムが公知となっている。
すなわち、このシステムによれば、歩行者に、無線通信可能な歩行者端末を携行させるとともに、車両にも、無線通線可能な車載端末を搭載する。また、車載端末は、例えば、車両に搭載された速度センサー、加速度センサーや方位センサー等から得られる信号に基づき、車両が所定時間内に移動することができるエリアを、自己危険アリアとして設定する。 Conventionally, the following systems have been known in order to avoid a collision between a pedestrian and a vehicle.
That is, according to this system, a pedestrian is allowed to carry a pedestrian terminal capable of wireless communication, and a vehicle is also equipped with an in-vehicle terminal capable of wireless communication. Further, the in-vehicle terminal sets, for example, an area in which the vehicle can move within a predetermined time as a self-danger aria based on signals obtained from a speed sensor, an acceleration sensor, a direction sensor, or the like mounted on the vehicle.

さらに、車載端末は、例えば、歩行者端末から無線発信される情報に基づき、歩行者が所定時間内に移動することができるエリアを相手危険エリアとして設定する。そして、自己危険エリアと相手危険エリアとが重なるか否かを判定し、この判定結果に基づき、歩行者と車両との衝突の可能性を判定したり、車両の乗員に衝突の可能性を通知したりする（例えば、特許文献１参照。）。 Further, the in-vehicle terminal sets, for example, an area where the pedestrian can move within a predetermined time as a partner danger area based on the information wirelessly transmitted from the pedestrian terminal. Then, it is determined whether or not the self-danger area and the opponent's danger area overlap, and based on this determination result, the possibility of collision between the pedestrian and the vehicle is determined, and the possibility of collision is notified to the occupants of the vehicle. (See, for example, Patent Document 1).

ところで、このシステムによれば、歩行者端末に情報を発信させる必要があり、発信のたびに歩行者端末のバッテリから電力が消費される。このため、歩行者端末では、車両との衝突回避のために要する電力の消費量を抑制することが求められている。 By the way, according to this system, it is necessary to make the pedestrian terminal transmit information, and each time the information is transmitted, power is consumed from the battery of the pedestrian terminal. For this reason, pedestrian terminals are required to reduce the amount of electric power required to avoid a collision with a vehicle.

特開２０１７−７６２７４号公報JP-A-2017-76274

本開示は、歩行者と車両との衝突を回避するため歩行者に携行される歩行者端末において、電力の消費量を抑制することを課題とする。 An object of the present disclosure is to suppress power consumption in a pedestrian terminal carried by a pedestrian in order to avoid a collision between a pedestrian and a vehicle.

本開示の歩行者端末は、無線により信号を発信する発信部、および、発信部による発信を制御する制御部を備え、歩行者に携行される。また、歩行者端末は、歩行者端末の空間的な動きに感応して信号を発生する感応部を備え、感応部、制御部および発信部は、歩行者端末に搭載され、歩行者が歩行者端末を携行して移動することにより、一体物として移動する。そして、制御部は、感応部の信号に基づき、歩行者端末の空間的な動きのレベルを検出し、歩行者端末の空間的な動きのレベルが高いほど、発信部による信号の発信頻度を増やす。 The pedestrian terminal of the present disclosure includes a transmission unit that wirelessly transmits a signal and a control unit that controls transmission by the transmission unit, and is carried by a pedestrian. Further, the pedestrian terminal includes a sensitive unit that generates a signal in response to the spatial movement of the pedestrian terminal, and the sensitive unit, the control unit, and the transmitting unit are mounted on the pedestrian terminal, and the pedestrian is a pedestrian. By carrying the terminal and moving it, it moves as an integral part. Then, the control unit detects the level of spatial movement of the pedestrian terminal based on the signal of the sensitive unit, and the higher the level of spatial movement of the pedestrian terminal, the higher the frequency of signal transmission by the transmitting unit. ..

運転支援システムのブロック図である。It is a block diagram of a driving support system. 歩行者端末の制御処理を示すフローチャートである。It is a flowchart which shows the control process of a pedestrian terminal. 歩行者端末の制御処理に伴う状態推移を示すタイムチャートである。It is a time chart which shows the state transition with the control process of a pedestrian terminal.

本開示を実施するための形態を以下の実施例により詳細に説明する。 The embodiment for carrying out the present disclosure will be described in detail with reference to the following examples.

〔実施例の構成〕
実施例の歩行者端末１と車載端末２とを備えた運転支援システム３を、図１を用いて説明する（以下の説明では、運転支援システム３をシステム３と略して呼ぶ。）。
まず、歩行者端末１は、無線により信号を発信する発信部４、発信部４による発信を制御する制御部５、および、後記する感応部６等を備え、歩行者に携行される。 [Structure of Examples]
The driving support system 3 including the pedestrian terminal 1 and the vehicle-mounted terminal 2 of the embodiment will be described with reference to FIG. 1 (in the following description, the driving support system 3 will be abbreviated as system 3).
First, the pedestrian terminal 1 includes a transmission unit 4 that wirelessly transmits a signal, a control unit 5 that controls transmission by the transmission unit 4, a sensitive unit 6, and the like, which will be described later, and is carried by a pedestrian.

すなわち、制御部５、発信部４および感応部６等は歩行者端末１に搭載され、歩行者が歩行者端末１を携行して移動することにより、一体物として移動する。なお、歩行者端末１は、歩行者と車両との衝突を回避することを目的とする専用の端末でもよく、また、スマートフォンと称される多機能型の携帯電話端末等に制御部５や感応部６の機能を具備させた端末でもよい。
以下、歩行者端末１の構成を具体的に説明する。 That is, the control unit 5, the transmission unit 4, the sensitive unit 6, and the like are mounted on the pedestrian terminal 1, and when the pedestrian carries the pedestrian terminal 1 and moves, the pedestrian moves as an integral body. The pedestrian terminal 1 may be a dedicated terminal for the purpose of avoiding a collision between a pedestrian and a vehicle, and may be a control unit 5 or a sensitive terminal to a multifunctional mobile phone terminal or the like called a smartphone. A terminal provided with the function of the unit 6 may be used.
Hereinafter, the configuration of the pedestrian terminal 1 will be specifically described.

まず、発信部４は、無線により信号を発信するものであるが、無線により信号を受信することができるように構成してもよい。
また、発信部４が発信する信号の周波数は１００ＭＨｚ以上、１ＧＨｚ以下であり、特定小電力帯域となるように設定される。さらに、通信伝搬距離が５０ｍ以上４ｋｍ以下、好ましくは、５０ｍ以上１ｋｍ以下、より好ましくは、５０ｍ以上３００ｍ以下、更に好ましくは、１００ｍ以上３００ｍ以下となるように設定される。 First, the transmitting unit 4 transmits a signal wirelessly, but may be configured so that the signal can be received wirelessly.
Further, the frequency of the signal transmitted by the transmitting unit 4 is 100 MHz or more and 1 GHz or less, and is set to be a specific low power band. Further, the communication propagation distance is set to be 50 m or more and 4 km or less, preferably 50 m or more and 1 km or less, more preferably 50 m or more and 300 m or less, and further preferably 100 m or more and 300 m or less.

次に、制御部５は、例えば、ＣＰＵ 、ＲＯＭ 、ＲＡＭおよびＩ／Ｏを有するマイクロコンピュータにより構成されている。そして、制御部５は、ＲＯＭ、ＲＡＭ等に格納されているコンピュータプログラムを実行することで、コンピュータプログラムに対応する処理を実行し、歩行者端末１の動作全般を制御する。 Next, the control unit 5 is composed of, for example, a microprocessor having a CPU, a ROM, a RAM, and an I / O. Then, the control unit 5 executes a process corresponding to the computer program by executing the computer program stored in the ROM, RAM, or the like, and controls the overall operation of the pedestrian terminal 1.

また、感応部６は、歩行者端末１の空間的な動きに感応して信号を発生するものであり、感応部６の出力は、例えば、歩行者端末１の空間的な動きのレベルが上がるのに伴って増加し、空間的な動きのレベルが下がるのに伴って低減する。なお、感応部６には、３軸加速度センサー、振動センサー、地磁気センサーなどが採用される。
そして、制御部５は、感応部６の信号の入力を受けるとともに、感応部６の信号に基づき、次のような機能を有する。 Further, the sensitive unit 6 generates a signal in response to the spatial movement of the pedestrian terminal 1, and the output of the sensitive unit 6 raises the level of the spatial movement of the pedestrian terminal 1, for example. It increases as the level of spatial movement decreases, and decreases as the level of spatial movement decreases. A 3-axis acceleration sensor, a vibration sensor, a geomagnetic sensor, or the like is adopted for the sensitive unit 6.
Then, the control unit 5 receives the input of the signal of the sensitive unit 6 and has the following functions based on the signal of the sensitive unit 6.

まず、制御部５は、感応部６の信号に基づき、歩行者端末１の空間的な動きのレベルを検出し、歩行者端末１の空間的な動きのレベルが高いほど、発信部４による信号の発信頻度を増やす。
より具体的には、制御部５は、発信頻度を増減するために利用する発信頻度増減用の閾値として、次の第１閾値および第２閾値を具備する。 First, the control unit 5 detects the level of spatial movement of the pedestrian terminal 1 based on the signal of the sensitive unit 6, and the higher the level of spatial movement of the pedestrian terminal 1, the higher the signal from the transmission unit 4. Increase the frequency of outgoing calls.
More specifically, the control unit 5 includes the following first and second thresholds as thresholds for increasing / decreasing the transmission frequency used for increasing / decreasing the transmission frequency.

ここで、第１閾値は、歩行者端末１の空間的な動きが所定のレベルであることを示すものであり、第２閾値は、歩行者端末１の空間的な動きが第１閾値のレベルよりも低いことを示すものである。
そして、感応部６の出力に基づき、歩行者端末１の空間的な動きが第１閾値のレベルよりも高いと判定したときに、発信頻度を増やす。また、発信頻度を増やした後、歩行者端末１の空間的な動きが第２閾値のレベルよりも低いと判定したときに、発信頻度を減らす。 Here, the first threshold value indicates that the spatial movement of the pedestrian terminal 1 is at a predetermined level, and the second threshold value is the level at which the spatial movement of the pedestrian terminal 1 is the first threshold value. Indicates that it is lower than.
Then, when it is determined that the spatial movement of the pedestrian terminal 1 is higher than the level of the first threshold value based on the output of the sensitive unit 6, the transmission frequency is increased. Further, after increasing the transmission frequency, when it is determined that the spatial movement of the pedestrian terminal 1 is lower than the level of the second threshold value, the transmission frequency is reduced.

さらに、制御部５は、歩行者端末１の空間的な動きのレベルが高いほど、感応部６の出力に対する検出頻度を増やす。
より具体的には、制御部５は、検出頻度を増減するために利用する検出頻度増減用の閾値として、第３閾値を具備する。ここで、第３閾値は、歩行者端末１の空間的な動きのレベルが第１閾値のレベルと第２閾値のレベルと間にあることを示すものである。そして、感応部６の出力に基づき、歩行者端末１の空間的な動きが第３閾値のレベルよりも高いと判定したときに、検出頻度を増やす。 Further, the control unit 5 increases the detection frequency with respect to the output of the sensitive unit 6 as the level of spatial movement of the pedestrian terminal 1 is higher.
More specifically, the control unit 5 includes a third threshold value as a threshold value for increasing / decreasing the detection frequency used for increasing / decreasing the detection frequency. Here, the third threshold value indicates that the level of spatial movement of the pedestrian terminal 1 is between the level of the first threshold value and the level of the second threshold value. Then, when it is determined that the spatial movement of the pedestrian terminal 1 is higher than the level of the third threshold value based on the output of the sensitive unit 6, the detection frequency is increased.

なお、第１閾値、第２閾値および第３閾値は変更可能である。すなわち、歩行者端末１には、ＵＳＢ端子等の接続部７が設けられ、パソコン等の手入力により、歩行者端末１の外部から、第１閾値、第２閾値および第３閾値を変更することができる。 The first threshold value, the second threshold value, and the third threshold value can be changed. That is, the pedestrian terminal 1 is provided with a connection portion 7 such as a USB terminal, and the first threshold value, the second threshold value, and the third threshold value are changed from the outside of the pedestrian terminal 1 by manual input of a personal computer or the like. Can be done.

以上により、歩行者が歩行を開始すると、歩行者端末１では、感応部６の出力が増加し、制御部５は、感応部６の出力が、順次、第３閾値、第１閾値よりも高くなったものと判定する。このため、制御部５は、感応部６の出力に対する検出頻度を増やし、引き続き、発信部４による信号の発信頻度を増やす。 As described above, when the pedestrian starts walking, the output of the sensitive unit 6 increases in the pedestrian terminal 1, and the output of the sensitive unit 6 in the control unit 5 is sequentially higher than the third threshold value and the first threshold value. It is judged that it has become. Therefore, the control unit 5 increases the detection frequency with respect to the output of the sensitive unit 6, and subsequently increases the transmission frequency of the signal by the transmission unit 4.

その後、歩行者が歩行を停止すると、歩行者端末１では、感応部６の出力が低減し、制御部５は、感応部６の出力が、第２閾値よりも低くなったものと判定する。このため、制御部５は、発信部４による信号の発信頻度を減らす。なお、検出頻度に関しては、例えば、感応部６の出力が第１閾値よりも高くなったものと判定して発信頻度を増やしたときに、減らす。 After that, when the pedestrian stops walking, the output of the sensitive unit 6 is reduced in the pedestrian terminal 1, and the control unit 5 determines that the output of the sensitive unit 6 is lower than the second threshold value. Therefore, the control unit 5 reduces the frequency of signal transmission by the transmission unit 4. The detection frequency is reduced, for example, when it is determined that the output of the sensitive unit 6 is higher than the first threshold value and the transmission frequency is increased.

次に、車載端末２は、歩行者端末１が発信する信号を受信するものであり、車両に搭載される。また、車載端末２は、歩行者と車両との衝突を回避することを目的とする専用の端末でもよく、また、ナビゲーション機能やオーディオ機能等の他の機能を兼用する端末でもよい
以下、車載端末２の構成を具体的に説明する。 Next, the in-vehicle terminal 2 receives the signal transmitted by the pedestrian terminal 1 and is mounted on the vehicle. Further, the in-vehicle terminal 2 may be a dedicated terminal for the purpose of avoiding a collision between a pedestrian and a vehicle, or may be a terminal that also has other functions such as a navigation function and an audio function. The configuration of 2 will be specifically described.

車載端末２は、次の受信部９および制御部１０等を備える。
まず、受信部９は、無線により信号を受信するものであるが、無線により信号を発信することができるように構成してもよい。
次に、制御部１０は、例えば、ＣＰＵ 、ＲＯＭ 、ＲＡＭおよびＩ／Ｏを有するマイクロコンピュータにより構成されている。そして、制御部１０は、ＲＯＭ、ＲＡＭ等に格納されているコンピュータプログラムを実行することで、コンピュータプログラムに対応する処理を実行し、車載端末２の動作全般を制御する。 The in-vehicle terminal 2 includes the following receiving unit 9, control unit 10, and the like.
First, although the receiving unit 9 receives the signal wirelessly, it may be configured so that the signal can be transmitted wirelessly.
Next, the control unit 10 is composed of, for example, a microprocessor having a CPU, a ROM, a RAM, and an I / O. Then, the control unit 10 executes a process corresponding to the computer program by executing the computer program stored in the ROM, RAM, or the like, and controls the overall operation of the in-vehicle terminal 2.

また、車両には、車載端末２とは別に報知部１１が搭載されている。
報知部１１は、車両の乗員に各種の情報を報知するものであり、例えば、乗員に歩行者の存在を知らせる。なお、報知部１１の具体的な態様は、次のような表示部や音声出力部である。すなわち、表示部は、所定の画面を有し、歩行者に衝突する可能性がある旨のメッセージや警告を画面に表示し、音声出力部は、所定の発音器を有し、歩行者に衝突する可能性がある旨の音声ガイダンスや警告音を発生する。 Further, the vehicle is equipped with a notification unit 11 separately from the in-vehicle terminal 2.
The notification unit 11 notifies the occupants of the vehicle of various types of information, and for example, notifies the occupants of the existence of a pedestrian. The specific mode of the notification unit 11 is the following display unit and voice output unit. That is, the display unit has a predetermined screen and displays a message or warning on the screen that there is a possibility of collision with a pedestrian, and the voice output unit has a predetermined sound generator and collides with a pedestrian. Generate voice guidance or warning sound to the effect that there is a possibility of doing so.

そして、車載端末２は、歩行者端末１から所定の頻度で信号を受信したときに、報知部１１に信号を出力し、報知部１１を介して、乗員に歩行者の存在を報知させる。ここで、制御部１０は、例えば、受信部９において歩行者端末１から信号を受信する頻度が所定の閾値よりも上がったときに、報知部１１に信号を出力して報知部１１に報知を開始させ、所定の閾値よりも下がったときに、報知部１１への信号の出力を停止して報知を停止させる。また、報知部１１に信号を出力するか否かを判定するための閾値は、歩行者端末１の発信頻度に関して設定されている高い値と低い値との間に設定されている。 Then, when the in-vehicle terminal 2 receives a signal from the pedestrian terminal 1 at a predetermined frequency, the vehicle-mounted terminal 2 outputs a signal to the notification unit 11 and causes the occupant to notify the presence of the pedestrian via the notification unit 11. Here, for example, when the frequency of receiving a signal from the pedestrian terminal 1 in the receiving unit 9 exceeds a predetermined threshold value, the control unit 10 outputs a signal to the notification unit 11 to notify the notification unit 11. It is started, and when it falls below a predetermined threshold value, the output of the signal to the notification unit 11 is stopped to stop the notification. Further, a threshold value for determining whether or not to output a signal to the notification unit 11 is set between a high value and a low value set for the transmission frequency of the pedestrian terminal 1.

以上により、例えば、車載端末２を中心とする所定半径の円の内部に存在する歩行者端末１において発信頻度が増えると、車載端末２に信号が受信される頻度が閾値よりも上がる。これにより、車載端末２から報知部１１への信号の出力が開始され、報知部１１は、乗員に歩行者の存在を知らせるための動作を開始する。その後、歩行者端末１において発信頻度が減ると、車載端末２に信号が受信される頻度が閾値よりも下がる。これにより、車載端末２から報知部１１への信号の出力が停止され、報知部１１は、乗員に歩行者の存在を知らせるための動作を停止する。 As described above, for example, when the transmission frequency of the pedestrian terminal 1 existing inside the circle having a predetermined radius centered on the vehicle-mounted terminal 2 increases, the frequency of receiving the signal to the vehicle-mounted terminal 2 rises above the threshold value. As a result, the output of the signal from the vehicle-mounted terminal 2 to the notification unit 11 is started, and the notification unit 11 starts the operation for notifying the occupant of the presence of a pedestrian. After that, when the transmission frequency of the pedestrian terminal 1 decreases, the frequency of receiving the signal to the vehicle-mounted terminal 2 becomes lower than the threshold value. As a result, the output of the signal from the vehicle-mounted terminal 2 to the notification unit 11 is stopped, and the notification unit 11 stops the operation for notifying the occupant of the presence of a pedestrian.

〔実施例の制御方法〕
実施例の歩行者端末１における制御処理、および、この制御処理に伴う状態の推移を、図２のフローチャート、および、図３のタイムチャートを用いて説明する。
なお、以下の説明では、制御処理開始時に歩行者が停止しているものとする。また、感応部６の出力は、歩行者端末１の空間的な動きのレベルが上がるのに伴って増加し、空間的な動きのレベルが下がるのに伴って低減するものとみなす。 [Control method of the embodiment]
The control process in the pedestrian terminal 1 of the embodiment and the transition of the state accompanying the control process will be described with reference to the flowchart of FIG. 2 and the time chart of FIG.
In the following description, it is assumed that the pedestrian is stopped at the start of the control process. Further, the output of the sensitive unit 6 is considered to increase as the level of spatial movement of the pedestrian terminal 1 increases and decrease as the level of spatial movement decreases.

まず、ステップＳ１で、感応部６の出力が第３閾値よりも大きいか否かを判定する。この結果、感応部６の出力が第３閾値よりも大きいと判定した場合（ＹＥＳ）、ステップＳ２に進み、制御部５による検出頻度を増加させる（時間ｔ１の状態を参照）。感応部６の出力が第３閾値よりも小さいと判定した場合（ＮＯ）、ステップＳ１に戻る。 First, in step S1, it is determined whether or not the output of the sensitive unit 6 is larger than the third threshold value. As a result, when it is determined that the output of the sensitive unit 6 is larger than the third threshold value (YES), the process proceeds to step S2, and the detection frequency by the control unit 5 is increased (see the state at time t1). When it is determined that the output of the sensitive unit 6 is smaller than the third threshold value (NO), the process returns to step S1.

すなわち、歩行者端末１を携行する歩行者が、歩行を開始するために動き始めると、歩行者端末１の空間的な動きのレベルが上がるので、感応部６の出力が増加する。そこで、次のステップＳ３における判定を高い精度で行うため、制御部５による検出頻度を増加させる。つまり、ステップＳ１を実行することにより、制御部５は、検出頻度を増加させるか否かを判定する検出頻度増加判定部として機能する。 That is, when a pedestrian carrying the pedestrian terminal 1 starts to move in order to start walking, the level of spatial movement of the pedestrian terminal 1 rises, so that the output of the sensitive unit 6 increases. Therefore, in order to perform the determination in the next step S3 with high accuracy, the detection frequency by the control unit 5 is increased. That is, by executing step S1, the control unit 5 functions as a detection frequency increase determination unit that determines whether or not to increase the detection frequency.

なお、ステップＳ１の判定は、例えば、感応部６の出力が、一時的にでも、第３閾値よりも大きくなれば、感応部６の出力が第３閾値よりも大きいと判定する。
また、検出頻度は、歩行者が停止している初期状態では、例えば、１秒間に６回、つまり、６Ｈｚであり、感応部６の出力が第３閾値よりも大きくなると、例えば、２５Ｈｚに増加される。 In the determination of step S1, for example, if the output of the sensitive unit 6 becomes larger than the third threshold value even temporarily, it is determined that the output of the sensitive unit 6 is larger than the third threshold value.
Further, the detection frequency is, for example, 6 times per second, that is, 6 Hz in the initial state where the pedestrian is stopped, and increases to, for example, 25 Hz when the output of the sensitive unit 6 becomes larger than the third threshold value. Will be done.

次に、ステップＳ３で、感応部６の出力が第１閾値よりも大きいか否かを判定する。この結果、感応部６の出力が第１閾値よりも大きいと判定した場合（ＹＥＳ）、ステップＳ４に進み、制御部５による検出頻度を低減させるとともに、発信頻度を増加させる（時間ｔ２の状態を参照）。つまり、ステップＳ３を実行することにより、制御部５は、発信頻度を増加させるか否かを判定する発信頻度増加判定部として機能する。また、感応部６の出力が第１閾値よりも小さいと判定した場合（ＮＯ）、ステップＳ８に進む。 Next, in step S3, it is determined whether or not the output of the sensitive unit 6 is larger than the first threshold value. As a result, when it is determined that the output of the sensitive unit 6 is larger than the first threshold value (YES), the process proceeds to step S4, the detection frequency by the control unit 5 is reduced, and the transmission frequency is increased (the state at time t2). reference). That is, by executing step S3, the control unit 5 functions as a transmission frequency increase determination unit that determines whether or not to increase the transmission frequency. If it is determined that the output of the sensitive unit 6 is smaller than the first threshold value (NO), the process proceeds to step S8.

すなわち、歩行者が動き始めた後、歩行するために動き続けようとすると、歩行者端末１の空間的な動きのレベルが更に上がるので、感応部６の出力が更に増加して第１閾値よりも大きくなる。その一方で、歩行中の感応部６の出力は、第１閾値を上回っても、瞬間的に、第３閾値や第２閾値を下回ることもあり、極めて複雑に経時変化する。そこで、ステップＳ３の判定では、発信頻度を無用に増やさないようにするため、例えば、次のように、所定の判定期間を要する（期間Ａを参照）。 That is, if the pedestrian starts to move and then tries to continue moving to walk, the level of spatial movement of the pedestrian terminal 1 further increases, so that the output of the sensitive unit 6 further increases and exceeds the first threshold value. Will also grow. On the other hand, even if the output of the sensitive unit 6 during walking exceeds the first threshold value, it may momentarily fall below the third threshold value or the second threshold value, and changes with time in an extremely complicated manner. Therefore, in the determination in step S3, a predetermined determination period is required as follows, for example, in order not to unnecessarily increase the transmission frequency (see period A).

すなわち、ステップＳ３の判定は、例えば、５秒の判定期間を設定するとともに、５秒の期間を前半、後半の２．５秒ずつに２等分する。そして、前半後半の２．５秒間、それぞれで、感応部６の出力に関して、以下に説明するオンエッジ、オフエッジが規定回数以上出現したか否かに基づき判定する。 That is, in the determination in step S3, for example, a determination period of 5 seconds is set, and the period of 5 seconds is divided into two equal parts of 2.5 seconds each in the first half and the second half. Then, for 2.5 seconds in the first half and the second half, the output of the sensitive unit 6 is determined based on whether or not the on-edge and off-edge described below appear more than a predetermined number of times.

ここで、オンエッジとは、第１閾値を小側から大側に超える出力の立ち上がりであり、出力が第１閾値よりも大きい期間が１秒以上続いた場合にオンエッジの出現を確定する。また、オフエッジとは、第１閾値を大側から小側に超える出力の立ち下がりであり、出力が第１閾値よりも小さい期間が１秒以上続いた場合にオフエッジの出現を確定する。 Here, the on-edge is the rise of the output that exceeds the first threshold value from the small side to the large side, and the appearance of the on-edge is determined when the period in which the output is larger than the first threshold value continues for 1 second or more. Further, the off-edge is a fall of the output exceeding the first threshold value from the large side to the small side, and the appearance of the off-edge is determined when the period in which the output is smaller than the first threshold value continues for 1 second or more.

なお、感応部６として、３軸加速度センサーを採用する場合、検出頻度２５Ｈｚで２．５秒間に１８９個の出力を検出することができる。そこで、例えば、前半の２．５秒間にオンエッジが４回以上、オフエッジが３回以上出現したこと、および、後半の２．５秒間でもオンエッジが４回以上、オフエッジが３回以上出現したことを確認すれば、感応部６の出力が第１閾値よりも大きいと判定し、発信頻度を増加させる。 When a 3-axis acceleration sensor is used as the sensitive unit 6, 189 outputs can be detected in 2.5 seconds at a detection frequency of 25 Hz. Therefore, for example, the on-edge appeared 4 times or more and the off-edge appeared 3 times or more in the first half 2.5 seconds, and the on-edge appeared 4 times or more and the off-edge appeared 3 times or more in the latter 2.5 seconds. If confirmed, it is determined that the output of the sensitive unit 6 is larger than the first threshold value, and the transmission frequency is increased.

発信頻度は、増加させる前では、例えば、１５秒ごとに１回、つまり、毎分４回であり、感応部６の出力が第１閾値よりも大きいと判定されると、例えば、３秒ごとに１回、つまり、毎分２０回に増加させる。より好ましくは、１秒ごとに１回、つまり、毎分６０回に増加させる。 Before increasing the transmission frequency, for example, once every 15 seconds, that is, 4 times per minute, and when it is determined that the output of the sensitive unit 6 is larger than the first threshold value, for example, every 3 seconds. Increase once every minute, that is, 20 times per minute. More preferably, it is increased once per second, that is, 60 times per minute.

また、発信頻度の増加に伴い、車載端末２では、歩行者端末１から信号を受信する頻度が高くなるので、報知部１１から乗員に歩行者の存在を知らせる警告表示や音声ガイダンスが行われる。
なお、検出頻度は、高頻度を維持する必要性がなくなるので、２５Ｈｚから６Ｈｚに低減させる。 Further, as the frequency of transmission increases, the frequency of receiving signals from the pedestrian terminal 1 increases in the in-vehicle terminal 2, so that the notification unit 11 provides a warning display and voice guidance to notify the occupants of the existence of the pedestrian.
The detection frequency is reduced from 25 Hz to 6 Hz because it is not necessary to maintain a high frequency.

次に、ステップＳ５で、感応部６の出力が第２閾値よりも小さいか否かを判定する。この結果、感応部６の出力が第２閾値よりも小さいと判定した場合（ＹＥＳ）、ステップＳ６に進む。また、感応部６の出力が第２閾値よりも大きいと判定した場合（ＮＯ）、ステップＳ５に戻る。 Next, in step S5, it is determined whether or not the output of the sensitive unit 6 is smaller than the second threshold value. As a result, when it is determined that the output of the sensitive unit 6 is smaller than the second threshold value (YES), the process proceeds to step S6. If it is determined that the output of the sensitive unit 6 is larger than the second threshold value (NO), the process returns to step S5.

すなわち、歩行者が、歩行を停止すると、歩行者端末１の空間的な動きのレベルが下がるので、感応部６の出力が低減する（時間ｔ３の状態を参照）。また、歩行者が歩行を停止すると、発信頻度を高頻度に維持する必要がなくなる。そこで、感応部６の出力が第２閾値よりも小さいと判定されたら（時間ｔ４の状態を参照）、次のステップＳ６で、発信頻度を下げる準備を開始する。 That is, when the pedestrian stops walking, the level of spatial movement of the pedestrian terminal 1 is lowered, so that the output of the sensitive unit 6 is reduced (see the state at time t3). Further, when the pedestrian stops walking, it is not necessary to maintain the transmission frequency at a high frequency. Therefore, when it is determined that the output of the sensitive unit 6 is smaller than the second threshold value (see the state at time t4), preparations for reducing the transmission frequency are started in the next step S6.

つまり、ステップＳ５を実行することにより、制御部５は、発信頻度を低減させるか否かを判定する発信頻度低減判定部として機能する。
なお、発信頻度の低減を慎重に実行するため、ステップＳ５の判定では、例えば、次のように、所定の判定期間を要する（期間Ｂを参照）。 That is, by executing step S5, the control unit 5 functions as a transmission frequency reduction determination unit that determines whether or not to reduce the transmission frequency.
In order to carefully reduce the transmission frequency, the determination in step S5 requires a predetermined determination period, for example, as follows (see period B).

すなわち、ステップＳ５では、例えば、１３秒の判定期間を設定し、この判定期間中に、感応部６の出力が第２閾値よりも大きくなることがなかった場合に、感応部６の出力が第２閾値よりも小さいと判定し、発信頻度を下げる準備を開始する。なお、ステップＳ５における判定期間は、例えば、発信頻度が高い状態において、感応部６の出力が第２閾値を大側から小側に超えたことを制御部５が検出したときに開始する。 That is, in step S5, for example, when a determination period of 13 seconds is set and the output of the sensitive unit 6 does not become larger than the second threshold value during this determination period, the output of the sensitive unit 6 is the second. 2 It is determined that the threshold value is smaller than the threshold value, and preparations for lowering the transmission frequency are started. The determination period in step S5 starts when, for example, the control unit 5 detects that the output of the sensitive unit 6 exceeds the second threshold value from the large side to the small side in a state where the transmission frequency is high.

次に、ステップＳ６では、所定の待機時間が経過したか否かを判定する。そして、所定の待機時間が経過したら（ＹＥＳ）、ステップＳ７に進み、発信頻度を低頻度（毎分４回）に低減し（時間ｔ５の状態を参照）、今回のフローを終了する。また、待機時間が経過していなければ（ＮＯ）、経過するまでステップＳ６を繰り返し、発信頻度を高頻度に維持する（期間Ｃを参照）。 Next, in step S6, it is determined whether or not the predetermined waiting time has elapsed. Then, when the predetermined waiting time elapses (YES), the process proceeds to step S7, the transmission frequency is reduced to a low frequency (4 times per minute) (see the state at time t5), and the current flow is terminated. If the waiting time has not elapsed (NO), step S6 is repeated until the waiting time elapses, and the transmission frequency is maintained at a high frequency (see period C).

一方、ステップＳ８では、感応部６の出力が第２閾値よりも小さいか否かを判定する。この結果、感応部６の出力が第２閾値よりも小さいと判定した場合（ＹＥＳ）、ステップＳ９に進み、制御部５による検出頻度を低減させ、このフローを終了する。これにより、一旦、検出頻度を増加させた後、感応部６の出力が発信頻度を増加させる程度まで上がらずに、逆に下がってしまった場合に、検出頻度を下げることができる。 On the other hand, in step S8, it is determined whether or not the output of the sensitive unit 6 is smaller than the second threshold value. As a result, when it is determined that the output of the sensitive unit 6 is smaller than the second threshold value (YES), the process proceeds to step S9, the detection frequency by the control unit 5 is reduced, and this flow is terminated. As a result, once the detection frequency is increased, the detection frequency can be reduced when the output of the sensitive unit 6 does not increase to the extent of increasing the transmission frequency but decreases on the contrary.

つまり、ステップＳ８を実行することにより、制御部５は、発信頻度を増加させる前に検出頻度を低減させるか否かを判定する検出頻度低減判定部として機能する。また、感応部６の出力が第２閾値よりも大きいと判定した場合（ＮＯ）、ステップＳ３に戻る。なお、ステップＳ８の判定は、例えば、ステップＳ５と同様である。 That is, by executing step S8, the control unit 5 functions as a detection frequency reduction determination unit that determines whether or not to reduce the detection frequency before increasing the transmission frequency. If it is determined that the output of the sensitive unit 6 is larger than the second threshold value (NO), the process returns to step S3. The determination in step S8 is the same as in step S5, for example.

〔実施例の効果〕
実施例の歩行者端末１は、無線により信号を発信する発信部４、および、発信部４による発信を制御する制御部５を備え、歩行者に携行される。また、歩行者端末１は、歩行者端末１の空間的な動きに感応して信号を発生する感応部６を備え、感応部６、制御部５および発信部４は、歩行者端末１に搭載され、歩行者が歩行者端末１を携行して移動することにより、一体物として移動する。そして、制御部５は、感応部６の信号に基づき、歩行者端末１の空間的な動きのレベルを検出し、歩行者端末１の空間的な動きのレベルが高いほど、発信部４による信号の発信頻度を増やす。 [Effect of Examples]
The pedestrian terminal 1 of the embodiment includes a transmission unit 4 that wirelessly transmits a signal and a control unit 5 that controls transmission by the transmission unit 4, and is carried by a pedestrian. Further, the pedestrian terminal 1 includes a sensitive unit 6 that generates a signal in response to the spatial movement of the pedestrian terminal 1, and the sensitive unit 6, the control unit 5, and the transmitting unit 4 are mounted on the pedestrian terminal 1. Then, when the pedestrian carries the pedestrian terminal 1 and moves, the pedestrian moves as an integral body. Then, the control unit 5 detects the level of the spatial movement of the pedestrian terminal 1 based on the signal of the sensitive unit 6, and the higher the level of the spatial movement of the pedestrian terminal 1, the higher the signal from the transmitting unit 4. Increase the frequency of outgoing calls.

これにより、歩行者端末１の信号の発信頻度を、歩行者の空間的な動きのレベルが高いほど、つまり、歩行者と車両との衝突の可能性が高いほど増加させることができる。一方で、歩行者の空間的な動きのレベルが低く、衝突の可能性が低いときには、発信頻度を低減させることができる。このため、衝突の可能性が低いときに、無用の信号発信を抑制することができるので、歩行者端末１における電力の消費量を抑制することができる。 As a result, the frequency of signal transmission of the pedestrian terminal 1 can be increased as the level of spatial movement of the pedestrian is higher, that is, as the possibility of collision between the pedestrian and the vehicle is higher. On the other hand, when the level of spatial movement of the pedestrian is low and the possibility of collision is low, the frequency of transmission can be reduced. Therefore, when the possibility of collision is low, unnecessary signal transmission can be suppressed, so that the power consumption of the pedestrian terminal 1 can be suppressed.

また、制御部５は、歩行者端末１の空間的な動きのレベルが高いほど、感応部６の信号に対する検出頻度を増やす。
これにより、検出頻度に関しても、衝突の可能性が低いときに、無用の信号検出を抑制することができるので、歩行者端末１における電力の消費量を更に抑制することができる。 Further, the control unit 5 increases the detection frequency for the signal of the sensitive unit 6 as the level of spatial movement of the pedestrian terminal 1 increases.
As a result, regarding the detection frequency, it is possible to suppress unnecessary signal detection when the possibility of collision is low, so that the power consumption in the pedestrian terminal 1 can be further suppressed.

また、制御部５は、発信頻度を増減するために利用する発信頻度増減用の閾値として、歩行者端末１の空間的な動きが所定のレベルであることを示す第１閾値、および、歩行者端末１の空間的な動きが第１閾値のレベルよりも低いことを示す第２閾値を具備する、そして、制御部５は、感応部６の信号に基づき、歩行者端末１の空間的な動きが第１閾値のレベルよりも高いと判定したときに、発信頻度を増やす。 Further, the control unit 5 uses as a threshold value for increasing / decreasing the transmission frequency used to increase / decrease the transmission frequency, a first threshold value indicating that the spatial movement of the pedestrian terminal 1 is at a predetermined level, and a pedestrian. It has a second threshold indicating that the spatial movement of the terminal 1 is lower than the level of the first threshold, and the control unit 5 has the spatial movement of the pedestrian terminal 1 based on the signal of the sensitive unit 6. When it is determined that is higher than the level of the first threshold value, the transmission frequency is increased.

また、制御部５は、発信頻度を増やした後、歩行者端末１の空間的な動きが第２閾値のレベルよりも低いと判定したときに、発信頻度を減らす。
これにより、感応部６の出力と第１閾値および第２閾値との対比に基づき、発信頻度の増減制御を実行することができる。 Further, after increasing the transmission frequency, the control unit 5 reduces the transmission frequency when it is determined that the spatial movement of the pedestrian terminal 1 is lower than the level of the second threshold value.
Thereby, the increase / decrease control of the transmission frequency can be executed based on the comparison between the output of the sensitive unit 6 and the first threshold value and the second threshold value.

また、制御部５は、検出頻度を増減するために利用する検出頻度増減用の閾値として、歩行者端末１の空間的な動きのレベルが第１閾値のレベルと第２閾値のレベルと間にあることを示す第３閾値を具備する。そして、制御部５は、感応部６の信号に基づき、歩行者端末１の空間的な動きが第３閾値のレベルよりも高いと判定したときに、検出頻度を増やす。 Further, as a threshold value for increasing / decreasing the detection frequency used for increasing / decreasing the detection frequency, the control unit 5 sets the spatial movement level of the pedestrian terminal 1 between the level of the first threshold value and the level of the second threshold value. It has a third threshold indicating that there is. Then, the control unit 5 increases the detection frequency when it is determined that the spatial movement of the pedestrian terminal 1 is higher than the level of the third threshold value based on the signal of the sensitive unit 6.

これにより、感応部６の出力と第３閾値との対比に基づき、検出頻度の増減制御を実行することができる。また、第３閾値を第１閾値と第２閾値との間に設定することにより、検出頻度の増加を発信頻度の増加に先行させることができる。このため、発信頻度を増加するか否かの判定を高い精度で実行することができる。 Thereby, the increase / decrease control of the detection frequency can be executed based on the comparison between the output of the sensitive unit 6 and the third threshold value. Further, by setting the third threshold value between the first threshold value and the second threshold value, the increase in the detection frequency can precede the increase in the transmission frequency. Therefore, it is possible to determine with high accuracy whether or not to increase the transmission frequency.

また、第１閾値、第２閾値および第３閾値は変更可能である。
これにより、例えば、幼稚園児、小学生、自転車、高齢者またはペットなどの歩行者の属性に応じて、第１閾値、第２閾値および第３閾値を設定することができる。このため、歩行者の属性に応じた発信頻度の増減や検出頻度の増減を実現することができる。 Further, the first threshold value, the second threshold value and the third threshold value can be changed.
Thereby, for example, the first threshold value, the second threshold value and the third threshold value can be set according to the attributes of pedestrians such as kindergarten children, elementary school students, bicycles, elderly people or pets. Therefore, it is possible to increase or decrease the transmission frequency and the detection frequency according to the attributes of the pedestrian.

また、発信部４が発信する信号の周波数は１００ＭＨｚ以上、１ＧＨｚ以下である。
これにより、歩行者端末１は、通信伝搬距離が比較的長く、回り込み特性が良好な周波数帯を用いて信号を発信することができる。 Further, the frequency of the signal transmitted by the transmitting unit 4 is 100 MHz or more and 1 GHz or less.
As a result, the pedestrian terminal 1 can transmit a signal using a frequency band having a relatively long communication propagation distance and good wraparound characteristics.

さらに、車載端末２の報知部１１は、車載端末２が歩行者端末１から所定の頻度で信号を受信したときに、車両の乗員に、歩行者の存在を報知する。
これにより、車両の乗員は、高い精度で歩行者の存在を確認することができる。 Further, the notification unit 11 of the vehicle-mounted terminal 2 notifies the occupants of the vehicle of the existence of a pedestrian when the vehicle-mounted terminal 2 receives a signal from the pedestrian terminal 1 at a predetermined frequency.
This allows the occupants of the vehicle to confirm the presence of pedestrians with high accuracy.

〔変形例〕
本願発明は、その要旨を逸脱しない範囲で様々な変形例を考えることができる。
すなわち、検出頻度増加判定部、検出頻度低減判定部、発信頻度増加判定部および発信頻度低減判定部の具体的な態様、ならびに、検出頻度の増加前の頻度、増加後の頻度、および、発信頻度の増加前の頻度、増加後の頻度の具体的な値等は実施例に限定されない。 [Modification example]
Various modifications of the present invention can be considered without departing from the gist thereof.
That is, the specific aspects of the detection frequency increase determination unit, the detection frequency reduction determination unit, the transmission frequency increase determination unit, and the transmission frequency reduction determination unit, and the frequency before the increase in the detection frequency, the frequency after the increase, and the transmission frequency. The specific values of the frequency before the increase and the frequency after the increase are not limited to the examples.

１ 歩行者端末 ４ 発信部 ５ 制御部 ６ 感応部 1 Pedestrian terminal 4 Transmitter 5 Control 6 Sensitive

本開示の歩行者端末は、無線により信号を発信する発信部、および、発信部による発信を制御する制御部を備え、歩行者に携行される。また、歩行者端末は、歩行者端末の空間的な動きに感応して信号を発生する感応部を備え、感応部、制御部および発信部は、歩行者端末に搭載され、歩行者が歩行者端末を携行して移動することにより、一体物として移動する。そして、制御部は、感応部の信号に基づき、歩行者端末の空間的な動きのレベルを検出し、歩行者端末の空間的な動きのレベルが高いほど、発信部による信号の発信頻度を増やす。また、発信部が発信する信号の周波数は１００ＭＨｚ以上、１ＧＨｚ以下であり、特定小電力帯域となるように設定される。 The pedestrian terminal of the present disclosure includes a transmission unit that wirelessly transmits a signal and a control unit that controls transmission by the transmission unit, and is carried by a pedestrian. Further, the pedestrian terminal includes a sensitive unit that generates a signal in response to the spatial movement of the pedestrian terminal, and the sensitive unit, the control unit, and the transmitting unit are mounted on the pedestrian terminal, and the pedestrian is a pedestrian. By carrying the terminal and moving it, it moves as an integral part. Then, the control unit detects the level of spatial movement of the pedestrian terminal based on the signal of the sensitive unit, and the higher the level of spatial movement of the pedestrian terminal, the higher the frequency of signal transmission by the transmitting unit. .. Further, the frequency of the signal transmitted by the transmitting unit is 100 MHz or more and 1 GHz or less, and is set to be a specific low power band.

Claims (9)

無線により信号を発信する発信部、および、この発信部による発信を制御する制御部を備え、歩行者に携行される歩行者端末において、
前記歩行者端末の空間的な動きに感応して信号を発生する感応部を備え、
この感応部、前記制御部および前記発信部は、前記歩行者端末に搭載され、前記歩行者が前記歩行者端末を携行して移動することにより、一体物として移動し、
前記制御部は、
前記感応部の信号に基づき、前記歩行者端末の空間的な動きのレベルを検出し、
前記歩行者端末の空間的な動きのレベルが高いほど、前記発信部による信号の発信頻度を増やすことを特徴とする歩行者端末。 In a pedestrian terminal that is provided with a transmitting unit that transmits a signal wirelessly and a control unit that controls transmission by this transmitting unit and is carried by a pedestrian.
A sensitive unit that generates a signal in response to the spatial movement of the pedestrian terminal is provided.
The sensitive unit, the control unit, and the transmission unit are mounted on the pedestrian terminal, and when the pedestrian carries the pedestrian terminal and moves, the pedestrian moves as an integral body.
The control unit
Based on the signal of the sensitive part, the level of spatial movement of the pedestrian terminal is detected.
A pedestrian terminal characterized in that the higher the level of spatial movement of the pedestrian terminal, the higher the frequency of signal transmission by the transmitting unit. 請求項１に記載の歩行者端末において、
前記制御部は、前記歩行者端末の空間的な動きのレベルが高いほど、前記感応部の信号に対する検出頻度を増やすことを特徴とする歩行者端末。 In the pedestrian terminal according to claim 1,
The control unit is a pedestrian terminal, characterized in that the higher the level of spatial movement of the pedestrian terminal, the higher the detection frequency for the signal of the sensitive unit. 請求項１または請求項２に記載の歩行者端末において、
前記制御部は、
前記発信頻度を増減するために利用する発信頻度増減用の閾値として、前記歩行者端末の空間的な動きが所定のレベルであることを示す第１閾値、および、前記歩行者端末の空間的な動きが前記第１閾値のレベルよりも低いことを示す第２閾値を具備し、
前記感応部の信号に基づき、前記歩行者端末の空間的な動きが前記第１閾値のレベルよりも高いと判定したときに、前記発信頻度を増やし、
前記発信頻度を増やした後、前記歩行者端末の空間的な動きが前記第２閾値のレベルよりも低いと判定したときに、前記発信頻度を減らすことを特徴とする歩行者端末。 In the pedestrian terminal according to claim 1 or 2.
The control unit
As the threshold value for increasing / decreasing the transmission frequency used for increasing / decreasing the transmission frequency, the first threshold value indicating that the spatial movement of the pedestrian terminal is at a predetermined level, and the spatial threshold of the pedestrian terminal. It comprises a second threshold indicating that the movement is below the level of the first threshold.
When it is determined that the spatial movement of the pedestrian terminal is higher than the level of the first threshold value based on the signal of the sensitive portion, the transmission frequency is increased.
A pedestrian terminal characterized in that the transmission frequency is reduced when it is determined that the spatial movement of the pedestrian terminal is lower than the level of the second threshold value after the transmission frequency is increased. 請求項３に記載の歩行者端末において、
前記第１閾値および前記第２閾値は変更可能であることを特徴とする歩行者端末。 In the pedestrian terminal according to claim 3,
A pedestrian terminal characterized in that the first threshold value and the second threshold value can be changed. 請求項３または請求項４に記載の歩行者端末において、
前記制御部は、
前記歩行者端末の空間的な動きのレベルが高いほど、前記感応部の信号に対する検出頻度を増やし、
この検出頻度を増減するために利用する検出頻度増減用の閾値として、前記歩行者端末の空間的な動きのレベルが前記第１閾値のレベルと前記第２閾値のレベルと間にあることを示す第３閾値を具備し、
前記感応部の信号に基づき、前記歩行者端末の空間的な動きが前記第３閾値のレベルよりも高いと判定したときに、前記検出頻度を増やすことを特徴とする歩行者端末。 In the pedestrian terminal according to claim 3 or 4.
The control unit
The higher the level of spatial movement of the pedestrian terminal, the higher the detection frequency for the signal of the sensitive unit.
As a threshold value for increasing / decreasing the detection frequency used for increasing / decreasing the detection frequency, it is shown that the level of spatial movement of the pedestrian terminal is between the level of the first threshold value and the level of the second threshold value. It has a third threshold and
A pedestrian terminal characterized in that the detection frequency is increased when it is determined that the spatial movement of the pedestrian terminal is higher than the level of the third threshold value based on the signal of the sensitive unit. 請求項５に記載の歩行者端末において、
前記第３閾値は変更可能であることを特徴とする歩行者端末。 In the pedestrian terminal according to claim 5.
A pedestrian terminal characterized in that the third threshold value can be changed. 請求項１ないし請求項６の内のいずれか１つに記載の歩行者端末において、
前記発信部が発信する信号の周波数は１００ＭＨｚ以上、１ＧＨｚ以下であることを特徴とする歩行者端末。 In the pedestrian terminal according to any one of claims 1 to 6.
A pedestrian terminal characterized in that the frequency of a signal transmitted by the transmitting unit is 100 MHz or more and 1 GHz or less. 請求項１ないし請求項７の内のいずれか１つに記載の歩行者端末が発信する信号を受信する端末であり、
車両に搭載されることを特徴とする車載端末。 A terminal that receives a signal transmitted by the pedestrian terminal according to any one of claims 1 to 7.
An in-vehicle terminal characterized by being mounted on a vehicle. 請求項１ないし請求項７の内のいずれか１つに記載の歩行者端末と、請求項８に記載の車載端末とを備えた運転支援システムにおいて、
前記車両に搭載され、前記車載端末が前記歩行者端末から所定の頻度で信号を受信したときに、前記車両の乗員に、前記歩行者の存在を報知する報知部を備えることを特徴とする運転支援システム。 In a driving support system including the pedestrian terminal according to any one of claims 1 to 7 and the in-vehicle terminal according to claim 8.
An operation characterized in that the vehicle-mounted terminal is mounted on the vehicle and is provided with a notification unit for notifying the occupants of the vehicle of the presence of the pedestrian when the in-vehicle terminal receives a signal from the pedestrian terminal at a predetermined frequency. Support system.
JP2019200355A 2019-11-04 2019-11-04 Pedestrian terminal, on-vehicle terminal, and driving support system Pending JP2021076877A (en)

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Publication number Priority date Publication date Assignee Title
JP2002081958A (en) * 2000-09-08 2002-03-22 Nippon Telegr & Teleph Corp <Ntt> Method for acquiring positional information
JP2011253403A (en) * 2010-06-03 2011-12-15 Advanced Telecommunication Research Institute International Communication system between pedestrian and vehicle
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