WO2024150280A1 - 状態検知システム、検知装置、状態検知方法及び状態検知プログラム - Google Patents

状態検知システム、検知装置、状態検知方法及び状態検知プログラム Download PDF

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Publication number
WO2024150280A1
WO2024150280A1 PCT/JP2023/000339 JP2023000339W WO2024150280A1 WO 2024150280 A1 WO2024150280 A1 WO 2024150280A1 JP 2023000339 W JP2023000339 W JP 2023000339W WO 2024150280 A1 WO2024150280 A1 WO 2024150280A1
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Prior art keywords
unit
time correlation
signal
propagation path
period
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PCT/JP2023/000339
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English (en)
French (fr)
Japanese (ja)
Inventor
圭太 栗山
利文 宮城
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to PCT/JP2023/000339 priority Critical patent/WO2024150280A1/ja
Priority to JP2024569698A priority patent/JPWO2024150280A1/ja
Publication of WO2024150280A1 publication Critical patent/WO2024150280A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement

Definitions

  • the present invention relates to a condition detection system, a detection device, a condition detection method, and a condition detection program.
  • CSI Channel state information
  • Non-Patent Document 1 discloses an object detection system that can detect the direction of movement of an object even in an environment where there are many changes in the wireless propagation environment other than the detection target and there is little multipath.
  • the present invention has been made in consideration of the above-mentioned problems, and aims to provide a condition detection system, detection device, condition detection method, and condition detection program that can accurately detect the condition of an object without prior learning.
  • a condition detection system includes a transmitting device that transmits a predetermined signal, and a detecting device that detects the condition of an object on the propagation path of the signal transmitted by the transmitting device.
  • the detecting device has a receiving unit that receives, via the propagation path, the same series of signals repeatedly transmitted by the transmitting device at a predetermined cycle, a blocking unit that blocks the signals received by the receiving unit into blocks with the cycle as a unit, a time correlation calculation unit that calculates the time correlation of the signals blocked by the blocking unit with the cycle as a unit, and a determining unit that determines that the object is in a stationary state when the time correlation calculated by the time correlation calculation unit is equal to or greater than a predetermined threshold value.
  • a detection device is characterized by having a receiving unit that receives signals of the same series repeatedly transmitted by a transmitting device at a predetermined cycle via a propagation path of the signals transmitted by the transmitting device, a blocking unit that blocks the signals received by the receiving unit into blocks with the cycle as a unit, a time correlation calculation unit that calculates the time correlation of the signals blocked by the blocking unit with the cycle as a unit, and a determination unit that determines that an object on the propagation path is in a stationary state when the time correlation calculated by the time correlation calculation unit is equal to or greater than a predetermined threshold value.
  • a state detection method for detecting the state of an object on a propagation path of a signal transmitted by a transmitting device that transmits a predetermined signal, the state detection method comprising the steps of: receiving, via the propagation path, a signal of the same series repeatedly transmitted by the transmitting device at a predetermined period; blocking, into blocks of the period as a unit, the signal received by the receiving step; a time correlation calculation step of calculating, with the period as a unit, the time correlation of the signal blocked by the blocking step; and a determination step of determining that the object is in a stationary state when the time correlation calculated by the time correlation calculation step is equal to or greater than a predetermined threshold value.
  • the state of an object can be detected with high accuracy even without prior learning.
  • FIG. 1 is a diagram showing an overview of a condition detection system according to an embodiment
  • FIG. 2 is a functional block diagram illustrating functions of a detection device according to an embodiment.
  • 1A is a diagram illustrating an example of a signal of the same series repeatedly transmitted by a transmitting device
  • FIG. 1B is a diagram illustrating an example of a signal blocked by a blocking unit of a detecting device
  • FIG. 1C is a diagram illustrating a schematic diagram of a time correlation calculated by a time correlation calculation unit.
  • FIG. 2 is a diagram illustrating an example of a hardware configuration of a detection device according to an embodiment.
  • 1A is a diagram showing a schematic diagram of a state detection system detecting a person in a house in a state of motion
  • FIG. 1B is a diagram showing a schematic diagram of a state detection system detecting a person in a house in a state of motion
  • FIG. 1 is a diagram showing an overview of a condition detection system 1 according to one embodiment.
  • a condition detection system 1 includes, for example, a transmitting device 2 that transmits a predetermined signal, and a detecting device 3 that detects the condition of an object on the propagation path of the signal transmitted by the transmitting device 2.
  • the transmitting device 2 is a communication device used for, for example, local 5G, Wi-Fi (registered trademark), Bluetooth (registered trademark), and other wireless systems, and the system type and frequency may be any type.
  • the detection device 3 has a function of receiving radio waves transmitted by the transmission device 2, and may be, for example, a software radio device having a function of observing the waveform of the received radio waves and a function of analyzing the observed waveform.
  • the objects whose states are detected by the state detection system 1 include people and the like.
  • the state detection system 1 is also configured to be able to detect whether a person is in a moving state (motion state) or a stationary state (stationary state).
  • FIG. 2 is a functional block diagram illustrating the functions possessed by the detection device 3 according to one embodiment.
  • the detection device 3 has, for example, a receiving unit 31, a blocking unit 32, a time correlation calculation unit 33, a determination unit 34, a learning unit 35, a discrimination unit 36, and an output unit 37.
  • the receiving unit 31 receives the same series of signals that are repeatedly transmitted by the transmitting device 2 at a predetermined period T via the propagation path of the signal transmitted by the transmitting device 2, and outputs the same to the blocking unit 32.
  • the period T is set to be longer than the maximum delay wavelength in the propagation path of the signal transmitted by the transmitting device 2.
  • the signal series of the signal transmitted by the transmitting device 2 may be unknown as long as the repetition period T is known.
  • the blocking unit 32 blocks the signal received by the receiving unit 31 into blocks with the period T as a unit, and outputs the blocks to the time correlation calculation unit 33.
  • the blocking unit 32 may block the signal received by the receiving unit 31 into blocks with a length of the period T, or may block the signal received by the receiving unit 31 into blocks with a length that is an integer multiple of the period T. In other words, the blocking unit 32 may block signals of multiple series together.
  • the time correlation calculation unit 33 calculates the time correlation for the signal blocked by the blocking unit 32 in units of period T, and outputs the calculated time correlation to the determination unit 34 and the learning unit 35.
  • the determination unit 34 determines that an object on the propagation path of the signal transmitted by the transmission device 2 is in a stationary state. If the time correlation calculated by the time correlation calculation unit 33 is less than the predetermined threshold value ⁇ , the determination unit 34 determines that an object on the propagation path of the signal transmitted by the transmission device 2 is in a moving state. Then, the determination unit 34 outputs the determination result to the learning unit 35 and the output unit 37.
  • the learning unit 35 learns the amount of variation in the time correlation calculated by the time correlation calculation unit 33, and outputs the learned result to the discrimination unit 36.
  • the discrimination unit 36 discriminates whether a change has occurred due to a change in the state of an object on the propagation path of the signal transmitted by the transmitting device 2 or a change in the environment on the propagation path based on the amount of variation learned by the learning unit 35, and outputs the discrimination result to the output unit 37.
  • the output unit 37 is, for example, an alarm or a display that outputs sound or an image, and outputs the results of the determination by the determination unit 34 and the results of the distinction by the distinction unit 36 in the form of sound or an image.
  • the output unit 37 may also be configured to transmit and output the results of the determination by the determination unit 34 and the results of the distinction by the distinction unit 36 via communication.
  • FIG. 3 is a diagram illustrating signals in each process executed by the condition detection system 1.
  • FIG. 3(a) is a diagram illustrating signals of the same series (series A) repeatedly transmitted by the transmitting device 2.
  • FIG. 3(b) is a diagram illustrating signals blocked by the blocking unit 32 of the detecting device 3.
  • FIG. 3(c) is a diagram that diagrammatically illustrates the time correlation calculated by the time correlation calculation unit 33.
  • the transmitting device 2 repeatedly transmits the same series of signals (series A).
  • the period T of series A is set to be longer than the maximum delay wave expected in the environment in which the condition detection system 1 is used.
  • the blocking unit 32 of the detection device 3 blocks the received series received by the receiving unit 31 for each period T.
  • the blocking unit 32 blocks each of the received series (1), received series (2), received series (3), etc. for the period T.
  • the time correlation calculation unit 33 repeatedly calculates the time correlation from the correlation between the block and the previous block. For example, the time correlation calculation unit 33 calculates the time correlation R12 between the received sequence (1) and the received sequence (2), the time correlation R23 between the received sequence (2) and the received sequence (3), and so on.
  • the determination unit 34 determines that an object on the propagation path of the signal transmitted by the transmission device 2 is in a stationary state. Also, when the time correlation calculated by the time correlation calculation unit 33 is less than the predetermined threshold value ⁇ (e.g., R 12 ⁇ ), the determination unit 34 determines that an object on the propagation path of the signal transmitted by the transmission device 2 is in a moving state.
  • a predetermined threshold value ⁇ e.g., R 12 ⁇
  • the condition detection system 1 may be configured to extract a known signal (e.g., a control signal such as a synchronization signal or a signal for estimating a communication channel) that is inserted into a part of a general wireless frame transmitted by the transmitting device 2, and calculate the time correlation.
  • a known signal e.g., a control signal such as a synchronization signal or a signal for estimating a communication channel
  • the status detection system 1 calculates the time correlation for the signal blocked by the blocking unit 32 in units of period T, and when the calculated time correlation is equal to or greater than a predetermined threshold, it determines that an object on the propagation path of the signal transmitted by the transmitting device 2 is in a stationary state, so that the status of the object can be detected with high accuracy even without prior learning.
  • each function possessed by the transmitting device 2 and the detecting device 3 may be configured in whole or in part by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array), or may be configured as a program executed by a processor such as a CPU.
  • the detection device 3 can be realized using a computer and a program, and the program can be recorded on a storage medium or provided via a network.
  • FIG. 4 is a diagram showing an example of the hardware configuration of the detection device 3 according to one embodiment.
  • the detection device 3 has an input unit 50, an output unit 51, a communication unit 52, a CPU 53, a memory 54, and a HDD 55 connected via a bus 56, and has the functions of a computer.
  • the detection device 3 is also capable of inputting and outputting data to and from a computer-readable storage medium 57.
  • the input unit 50 is, for example, a keyboard and a mouse.
  • the output unit 51 is, for example, a display device such as an alarm or a display corresponding to the output unit 37 described above.
  • the communication unit 52 is, for example, a communication interface that performs wireless communication via a wireless LAN or the like.
  • the CPU 53 controls each component of the detection device 3 and performs predetermined processing.
  • the memory 54 and HDD 55 are storage units that store data, etc.
  • the storage medium 57 is capable of storing programs and the like that execute the functions of the detection device 3. Note that the architecture that constitutes the detection device 3 is not limited to the example shown in FIG. 4.
  • Figure 5 is a diagram illustrating an example of the detection result obtained when the status detection system 1 is installed in a house inhabited by elderly people or the like.
  • Figure 5(a) is a diagram showing a schematic diagram of the result of the status detection system 1 detecting that a person in the house is in an active state.
  • Figure 5(b) is a diagram showing a schematic diagram of the result of the status detection system 1 detecting that a person in the house is in a stationary state.
  • condition detection system 1 is installed in a closed space (static fading environment) such as a house where elderly people or the like live, it is possible to detect a state in which a person is moving (dynamic environment) and a state in which the person is stationary (static environment). For example, if a person in a house remains stationary for an extended period of time (when the person stops moving), the condition of radio wave propagation is different from when the person is moving, so the condition detection system 1 detects this state and issues an alarm.
  • a closed space static fading environment
  • a state in which the person is moving dynamic environment
  • static environment a state in which the person is stationary
  • the condition detection system 1 detects this state and issues an alarm.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
PCT/JP2023/000339 2023-01-10 2023-01-10 状態検知システム、検知装置、状態検知方法及び状態検知プログラム Ceased WO2024150280A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002217811A (ja) * 2001-01-15 2002-08-02 Hitachi Ltd 状態検知方法、状態検知装置、移動端末装置及び移動状態観察システム
JP2019523858A (ja) * 2016-05-11 2019-08-29 コグニティヴ システムズ コーポレイション 基準信号送信に基づく動き検出
US20190271774A1 (en) * 2018-03-01 2019-09-05 Qualcomm Incorporated Method and apparatus for motion detection systems
CN112596024A (zh) * 2020-12-04 2021-04-02 华中科技大学 一种基于环境背景无线射频信号的运动识别方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002217811A (ja) * 2001-01-15 2002-08-02 Hitachi Ltd 状態検知方法、状態検知装置、移動端末装置及び移動状態観察システム
JP2019523858A (ja) * 2016-05-11 2019-08-29 コグニティヴ システムズ コーポレイション 基準信号送信に基づく動き検出
US20190271774A1 (en) * 2018-03-01 2019-09-05 Qualcomm Incorporated Method and apparatus for motion detection systems
CN112596024A (zh) * 2020-12-04 2021-04-02 华中科技大学 一种基于环境背景无线射频信号的运动识别方法

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