WO2014057651A1 - 無線センサ装置 - Google Patents

無線センサ装置 Download PDF

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Publication number
WO2014057651A1
WO2014057651A1 PCT/JP2013/005970 JP2013005970W WO2014057651A1 WO 2014057651 A1 WO2014057651 A1 WO 2014057651A1 JP 2013005970 W JP2013005970 W JP 2013005970W WO 2014057651 A1 WO2014057651 A1 WO 2014057651A1
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WO
WIPO (PCT)
Prior art keywords
signal
transmission
circuit
phase shift
period
Prior art date
Application number
PCT/JP2013/005970
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English (en)
French (fr)
Japanese (ja)
Inventor
竇　元珠
Original Assignee
アルプス電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by アルプス電気株式会社 filed Critical アルプス電気株式会社
Priority to JP2014540738A priority Critical patent/JPWO2014057651A1/ja
Priority to CN201380052877.9A priority patent/CN104704386A/zh
Publication of WO2014057651A1 publication Critical patent/WO2014057651A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
    • 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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection

Definitions

  • the present invention relates to a wireless sensor device, and more particularly to a wireless sensor device capable of detecting a stationary detection target.
  • sensors that measure the distance to a detection target using radio waves sensors that detect the presence or proximity of the detection target by detecting the movement of the detection target, and the like have been proposed.
  • a transmission circuit that transmits a high-frequency signal digitally modulated by a modulation circuit 901, a transmission antenna 902 that radiates a high-frequency signal, and a communication partner.
  • a receiving antenna 902 that receives a signal and a reflected wave from an object, a receiving circuit that demodulates a received signal output from the receiving antenna 902 by a demodulating circuit 903 and takes in a signal from a communication partner as received data; and a transmitting circuit Phase detection for phase detection of a combined signal obtained by interfering a part of the high-frequency signal fed to the receiving antenna 902 and a reflected wave reception signal that is a reflected wave from the object received by the receiving antenna 902 during high-frequency signal transmission
  • a signal processing circuit for detecting a change in position of the object by signal processing the detection signal output from the circuit 904 and the phase detection circuit 904 It is provided with a 905, a.
  • This invention solves the subject mentioned above, and aims at providing the radio
  • a wireless sensor device radiates a transmission signal, receives a reflected signal reflected from a detection target of the transmission signal, generates the transmission signal, and transmits the transmission signal.
  • a transmission circuit having an output terminal for outputting a signal; and the transmission circuit connected to the output terminal of the transmission circuit, and receiving the part of the transmission signal and the antenna while transmitting the transmission signal from the transmission circuit
  • a detection circuit that detects a reflected signal; a signal processing circuit that is connected to the detection circuit and processes a signal output from the detection circuit; and a control circuit that is connected to the transmission circuit and controls the transmission circuit;
  • a first phase shifter between the antenna and the output terminal, wherein the control circuit controls the phase shifter and performs a transmission / reception operation with a first phase shift amount.
  • the wireless sensor device is the wireless sensor device according to claim 1, wherein a difference between the first phase shift amount and the second phase shift amount is ⁇ / 4 (radian, hereinafter rad)).
  • the control circuit controls the phase shifter, the first period in which the transmission / reception operation is performed with the first phase shift amount, and the second period in which the transmission / reception operation is performed with the second phase shift amount.
  • the detection target is detected by calculating the output from the signal processing circuit based on the reflected signal of the first period and the reflected signal of the second period, while controlling the period so as to be alternately repeated. Therefore, components orthogonal to each other can be extracted from the reflected signal in the first period and the reflected signal in the second period. As a result, even if the detection target is a stationary object, the presence or absence of the detection target can be detected.
  • the reflection signal in the first period and the reflection in the second period Since the phase difference of the signal is ⁇ / 2 (rad) and components orthogonal to each other can be detected with high sensitivity, even if the detection target is a stationary object, it can be detected with high sensitivity.
  • the wireless sensor device 100 radiates a transmission signal, detects a reflected signal from the detection target, and detects the detection target.
  • FIG. 2 is a block diagram illustrating a configuration of the wireless sensor device 100.
  • the wireless sensor device 100 includes an antenna 1, a transmission circuit 2 having an output terminal 2a, a detection circuit 3, a signal processing circuit 4, a control circuit 5, and a phase shifter 6. ing.
  • the wireless sensor device 100 has a power supply circuit (not shown) and supplies power necessary for operation to each part of the wireless sensor device 100.
  • the antenna 1 is connected to the output terminal 2a of the transmission circuit 2 via the phase shifter 6, radiates the transmission signal, and receives the reflected signal reflected by the detection target of the transmission signal.
  • the transmission circuit 2 generates a transmission signal and outputs the transmission signal to the output terminal 2a.
  • the detection circuit 3 is connected to the output terminal 2a of the transmission circuit 2, and while the transmission circuit 2 is transmitting a transmission signal, a part of the transmission signal output from the output terminal 2a and the antenna 1 is radiated and reflected by the detection target. The reflected signal received by the antenna 1 is detected.
  • the signal processing circuit 4 is connected to the detection circuit 3 and has at least a function of a low-pass filter (hereinafter referred to as LPF) that removes a signal having a frequency higher than the frequency of the transmission signal from the detection output signal output from the detection circuit 3. Then, signal processing of the detection output signal output from the detection circuit 3 is performed, and the result is output to the control circuit 5.
  • LPF low-pass filter
  • the control circuit 5 is connected to the transmission circuit 2, the signal processing circuit 4, and the phase shifter 6.
  • the control circuit 5 controls the operation state of the transmission circuit 2 and obtains an output signal from the signal processing circuit 4 to detect body movement accompanying breathing from the detection target, body surface movement accompanying heartbeat, Judgment of presence or absence of detection is performed.
  • control circuit 5 alternately repeats the first period in which the phase shifter 6 performs the transmission / reception operation with the first phase shift amount and the second period in which the transmission / reception operation is performed with the second phase shift amount.
  • a control signal to be controlled is output.
  • the phase shifter 6 operates in accordance with the control signal of the control circuit 5 to give the first phase shift amount ⁇ 1 to the transmission signal and a phase shift amount larger by ⁇ / 4 (rad) than the first phase shift amount ⁇ 1.
  • An operation of giving the second phase shift amount ⁇ 2 to be given is performed, and the phase shift amount given to the transmission signal is changed.
  • the first phase shift amount ⁇ 1 may be 0 (rad) or may be configured to have a predetermined value.
  • the control circuit 5 outputs a control signal V1 that gives a first phase shift amount ⁇ 1 to the phase shifter 6 during a time t1 (first period) from time T1 to T2,
  • a transmission output control signal for controlling the transmission circuit 2 is output so that the transmission signal is output from the output terminal 2 a, and the transmission signal is output from the output terminal 2 a of the transmission circuit 2 and the first phase shifter 6 outputs the transmission signal.
  • a quantity ⁇ 1 is given and radiated from the antenna 1.
  • a part of the transmission signal radiated from the antenna 1 is reflected by the detection target and received by the antenna 1 as a reflected signal.
  • the reflected signal received by the antenna 1 is again given the first phase shift amount ⁇ 1 by the phase shifter 6 and returns to the output terminal 2a, and a part of the transmission signal being transmitted and the reflected signal are detected by the detection circuit 3. Is input.
  • Vr B ⁇ cos ( ⁇ t + ⁇ 1) (Expression 2)
  • B is the amplitude of the reflected signal
  • the transmission signal radiated from the antenna 1 with the amplitude A represented by (Equation 1) is reflected by the detection target and returns to the antenna 1 again.
  • the amplitude of the reflected signal is attenuated to B and received by the attenuation (transmission loss) received by the transmission path between them and the attenuation (reflection loss) received by the reflectance when the phase signal is reflected by the detection target.
  • the angular frequency is 2 ⁇ T, and since the frequency component is twice the transmission frequency, it can be removed by the LPF function of the signal processing circuit 4.
  • the output signal Vp1 of the signal processing circuit 4 in the first period from which the frequency component twice the transmission frequency is removed is expressed by Expression (4).
  • Vp1 (A ⁇ B / 2) cos ⁇ 1 (Formula 4)
  • Vp1 changes with the movement of the detection target, so that Vp1 changes with the change of ⁇ 1. Therefore, the motion of the detection target can be detected by detecting the change in Vp1.
  • the control circuit 5 converts the output signal Vp1 of the signal processing circuit 4 in the first period from analog to digital, and stores it as digitized data in a storage circuit included in the control circuit 5.
  • the control circuit 5 outputs a transmission output control signal for controlling the transmission circuit 2 so that the transmission signal is not output from the transmission circuit 2 to the output terminal 2a at the time T2, and stops the transmission operation for the time t2 until the time T3. To do.
  • control circuit 5 outputs the control signal V2 that gives the second phase shift amount ⁇ 2 to the phase shifter 6 during the time t1 from time T3 to T4 (second period), and the transmission signal is output.
  • a transmission output control signal for controlling the transmission circuit 2 is output so as to be output from the terminal 2a.
  • the transmission signal is output from the output terminal 2a of the transmission circuit 2 and is given a second phase shift amount ⁇ 2 by the phase shifter 6. And is radiated from the antenna 1.
  • a part of the transmission signal radiated from the antenna 1 is reflected by the detection target and received by the antenna 1 as a reflected signal.
  • the reflected signal received by the antenna 1 is again given the second phase shift amount ⁇ 2 by the variable phase shifter 6 and returns to the output terminal 2a, and a part of the transmission signal being transmitted and the reflected signal are detected by the detection circuit. 3 is input.
  • the transmission signal Vo is expressed by (Expression 1)
  • the reflected signal Vr is expressed by (Expression 5).
  • (theta) 2 represents the phase shift angle (phase difference) of the reflected signal Vr with respect to the transmission signal Vo of a 2nd period.
  • Vr B ⁇ cos ( ⁇ t + ⁇ 2) (Formula 5)
  • Vp2 (A ⁇ B / 2) cos ⁇ 2 (Expression 7)
  • Vp2 also changes when ⁇ 2 changes due to the movement of the detection target. Therefore, when the detection target is a stationary object, ⁇ 2 changes depending on the distance to the detection target. Since the value is constant, a DC signal having a fixed value calculated by (Equation 7) is output.
  • the control circuit 5 converts the output signal Vp2 of the signal processing circuit 4 in the second period from analog to digital, and stores it in a storage circuit included in the control circuit 5 as a digitized data value.
  • the control circuit 5 outputs a transmission output control signal for controlling the transmission circuit 2 so that the transmission signal is not output from the transmission circuit 2 to the output terminal 2a at the time T4, and stops the transmission operation for the time t2 until the time T5. To do. After time T5, the operation from time T1 is repeated in the same manner.
  • Equation 8 the first phase shift amount ⁇ 1 representing the phase shift angle of the reflected signal Vr with respect to the transmission signal Vo in the first period is given by the first phase shift amount ⁇ 1 output from the output terminal 2a and given by the phase shifter 6.
  • the phase shift amount ⁇ o depending on the length of the path from the antenna 1 until the reflected signal radiated from the antenna 1 and reflected by the detection target returns to the antenna 1 and the antenna 1 passes through the phase shifter 6.
  • the first phase shift amount ⁇ 1 is given and the total amount of time until the output terminal 2a is returned is expressed as (Equation 8).
  • Equation 10 Since the second phase shift amount ⁇ 2 is larger than the first phase shift amount ⁇ 1 by a ⁇ / 4 (rad) phase shift amount, ⁇ 2 can be expressed as (Equation 10).
  • Equation 12 can be obtained by substituting (Equation 11) into (Equation 7).
  • the transmission signal is transmitted with the first phase shift amount in the first period, the reflected signal is received, and ⁇ / 4 (rad) larger than the first phase shift amount in the second period.
  • the transmission signal is transmitted with the amount of phase shift and the reflected signal is received, the phase difference between the reflected signal in the first period and the reflected signal in the second period is different by ⁇ / 2 (rad). It can be detected with high sensitivity.
  • the control circuit 5 adds the square values of the stored Vp1 and Vp2, and calculates the calculation results of (Equation 13) and (Equation 14).
  • (Vp1) 2 + (Vp2) 2 (A ⁇ B / 2) 2 (sin 2 ⁇ 1 + cos 2 ⁇ 1)
  • (sin 2 ⁇ 1 + cos 2 ⁇ 1) is 1.
  • the control circuit 5 determines the presence / absence of a detection target from the result of the calculation of (Equation 14), and outputs the result.
  • detected by the distance from the antenna 1 to the detection target can be estimated in advance, so that the distance to the detection target can be estimated.
  • ⁇ 1 in (Expression 4) and ⁇ 2 in (Expression 7) change depending on the motion of the detection target, so the first transmission / reception operation is performed with the first phase shift amount.
  • the movement of the detection target can also be detected from the fluctuation of Vp1 in the period or Vp2 in the second period in which the transmission / reception operation is performed with the second phase shift amount.
  • Equation 17 can be obtained by substituting (Equation 16) into (Equation 7).
  • the transmission signal is transmitted with the first phase shift amount in the first period, the reflected signal is received, and the second phase shift amount ⁇ 2 is smaller than the first phase shift amount ⁇ 1.
  • the phase shift amount is further shifted by ⁇ (rad) from ⁇ / 4 (rad)
  • an error corresponding to the phase shift amount 2 ⁇ (rad) shifted from ⁇ / 4 (rad) is included.
  • a component orthogonal to the reflected signal in the first period represented by (Expression 4) can be detected.
  • control circuit 5 controls the phase shifter 6 to perform the first transmission / reception operation with the first phase shift amount and the second period for the transmission / reception operation with the second phase shift amount. And the output from the signal processing circuit 4 based on the reflection signal in the first period and the reflection signal in the second period are calculated, so that the reflection in the first period is calculated. Components orthogonal to each other can be extracted from the signal and the reflected signal in the second period. As a result, even if the detection target is a stationary object, the presence or absence of the detection target can be detected.
  • the difference between the first phase shift amount and the second phase shift amount is ⁇ / 4 (rad)
  • the phase difference between the reflected signal in the first period and the reflected signal in the second period is ⁇ / 2 ( rad)
  • the wireless sensor device 100 As described above, according to the wireless sensor device 100 according to the embodiment of the present invention, it is possible to provide a wireless sensor device that can detect a stationary detection target.
  • the wireless sensor device 100 As described above, the wireless sensor device 100 according to the embodiment of the present invention has been specifically described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Is possible. For example, the present invention can be modified as follows, and these embodiments also belong to the technical scope of the present invention.
  • the output Vp when there is no detection target, the output Vp has been described as “0” (zero). However, a slight output is output even if there is no detection target due to variations in circuit configuration and parts used. Therefore, it may be configured to determine the presence or absence of a detection target by setting a detection threshold for the detection target.
  • the example in which the phase shift amount is changed for each transmission period has been described.
  • the first period for giving the first phase shift amount and the second phase shift amount are given.
  • the second period may be controlled to include a period for performing a plurality of transmission operations.
  • the function of the signal processing circuit 4 has been described using only the function of the LPF, but other functions such as amplification and sampling may be provided.
  • control circuit 5 demonstrated and demonstrated the example which calculates the output from the signal processing circuit 4 based on the reflected signal of the 1st period, and the reflected signal of the 2nd period.
  • the signal processing circuit may have a function for performing the calculation, and may be configured to have an independent calculation function separately from the control circuit and the signal processing circuit.
  • the configuration may be such that modulation can be performed.
  • the LPF function of the signal processing circuit has a cutoff frequency. Is preferably set lower than the frequency of the modulation signal.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
PCT/JP2013/005970 2012-10-10 2013-10-08 無線センサ装置 WO2014057651A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014540738A JPWO2014057651A1 (ja) 2012-10-10 2013-10-08 無線センサ装置
CN201380052877.9A CN104704386A (zh) 2012-10-10 2013-10-08 无线传感器装置

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JP2012224864 2012-10-10
JP2012-224864 2012-10-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015029794A1 (ja) * 2013-09-02 2015-03-05 アルプス電気株式会社 無線センサ装置
EP3167801A4 (en) * 2014-07-10 2018-02-28 Alps Electric Co., Ltd. Wireless sensor apparatus
CN111865442A (zh) * 2020-07-22 2020-10-30 成都九洲迪飞科技有限责任公司 一种收发组件的发射检波方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3489851B1 (en) * 2017-11-21 2021-07-07 Panasonic Intellectual Property Management Co., Ltd. Identification device and identification method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03282285A (ja) * 1990-03-30 1991-12-12 New Japan Radio Co Ltd マイクロ波ドプラー方式侵入検知器
JP2005017193A (ja) * 2003-06-27 2005-01-20 Makita Corp レーダ装置と距離と反射率の測定方法
JP2011089864A (ja) * 2009-10-22 2011-05-06 Alps Electric Co Ltd 無線センサ装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777131A1 (de) * 1995-12-06 1997-06-04 Geberit Technik Ag Überwachungsvorrichtung mit einer Radarsonde
JPWO2011142211A1 (ja) * 2010-05-11 2013-07-22 アルプス電気株式会社 通信センサ装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03282285A (ja) * 1990-03-30 1991-12-12 New Japan Radio Co Ltd マイクロ波ドプラー方式侵入検知器
JP2005017193A (ja) * 2003-06-27 2005-01-20 Makita Corp レーダ装置と距離と反射率の測定方法
JP2011089864A (ja) * 2009-10-22 2011-05-06 Alps Electric Co Ltd 無線センサ装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015029794A1 (ja) * 2013-09-02 2015-03-05 アルプス電気株式会社 無線センサ装置
EP3167801A4 (en) * 2014-07-10 2018-02-28 Alps Electric Co., Ltd. Wireless sensor apparatus
CN111865442A (zh) * 2020-07-22 2020-10-30 成都九洲迪飞科技有限责任公司 一种收发组件的发射检波方法

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JPWO2014057651A1 (ja) 2016-08-25
CN104704386A (zh) 2015-06-10

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