WO2014057651A1 - Wireless sensor - Google Patents

Wireless sensor 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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Prior art keywords
signal
transmission
circuit
phase shift
period
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PCT/JP2013/005970
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French (fr)
Japanese (ja)
Inventor
竇　元珠
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アルプス電気株式会社
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Priority to CN201380052877.9A priority Critical patent/CN104704386A/en
Priority to JP2014540738A priority patent/JPWO2014057651A1/en
Publication of WO2014057651A1 publication Critical patent/WO2014057651A1/en

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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.

Abstract

[Problem] To provide a wireless sensor capable of detecting a stationary object. [Solution] A wireless sensor comprises: an antenna (1) that emits a transmission signal and receives a reflected signal, which is the transmission signal reflected off of an object; a transmitting circuit (2) comprising an output terminal (2a) for generating the transmission signal and outputting the transmission signal; a detecting circuit (3) that is connected to the output terminal (2a) of the transmitting circuit (2) and that detects a portion of the transmission signal and the reflected signal received by the antenna (1) during transmission of the transmission signal by the transmitting circuit (2); a signal processing circuit (4) that is connected to the detecting circuit (3) and that processes a signal output from the detecting circuit (3); and a controlling circuit (5) that is connected to the transmitting circuit (2) and controls the transmitting circuit (2); wherein a phase shifter (6) is between the antenna (1) and the output terminal (2a), and the controlling circuit (5) controls the phase shifter (6) so that a first period, in which transmitting and receiving operation occurs with a first phase shift volume, and a second period, in which transmitting and receiving operation occurs with a second phase shift volume, mutually alternate.

Description

無線センサ装置Wireless sensor device
　本発明は、無線センサ装置に関し、特に、静止している検出対象を検出することができる無線センサ装置に関する。 The present invention relates to a wireless sensor device, and more particularly to a wireless sensor device capable of detecting a stationary detection target.
　従来から、電波を用いて検出対象までの距離を測定するセンサや、検出対象の動きを検出し検出対象の有無や接近を検出するセンサなどが提案されている。 Conventionally, 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.
　近年、このような電波を用いたセンサが非接触で検出対象の動きを検出できることから様々な分野での応用が検討されている。 In recent years, applications in various fields are being studied because sensors using such radio waves can detect the movement of a detection target without contact.
　特許文献１に記載の通信センサ装置９００では、図４に示すように、変調回路９０１によりデジタル変調された高周波信号を送信する送信回路と、高周波信号を放射する送信アンテナ９０２と、通信相手からの信号と対象物からの反射波を受信する受信アンテナ９０２と、受信アンテナ９０２から出力される受信信号を復調回路９０３により復調して通信相手からの信号を受信データとして取り込む受信回路と、送信回路から高周波信号送信中に、受信アンテナ９０２へ給電した高周波信号の一部と受信アンテナ９０２で受信された対象物からの反射波である反射波受信信号とを干渉させた合成信号を位相検波する位相検波回路９０４と、位相検波回路９０４から出力される検波信号を信号処理して対象物の位置変化検出を行う信号処理回路９０５と、を備えている。 In the communication sensor device 900 described in Patent Document 1, as shown in FIG. 4, 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.
　送信回路から高周波信号送信中に、受信アンテナ９０２へ給電した高周波信号の一部と受信アンテナ９０２で受信された反射波受信信号とを干渉させた合成信号を位相検波することで、データ通信に使用している信号を用いてデータ通信とセンシングとを同時に同一周波数で実現できる通信センサ装置の技術が開示されている。 Used for data communication by phase detection of a combined signal obtained by interfering a part of the high-frequency signal supplied to the receiving antenna 902 and the reflected wave received signal received by the receiving antenna 902 during high-frequency signal transmission from the transmission circuit The technology of the communication sensor apparatus which can implement | achieve data communication and sensing simultaneously with the same frequency using the signal which is carrying out is disclosed.
　　ＷＯ２０１１／１４２２１１ WO2011 / 142211
　しかしながら、上述した従来技術においては、検出対象の位置変化を検出するため、動きの有る検出対象は検出することができるが、静止している検出対象を検出することができないという課題があった。 However, in the above-described prior art, since a change in the position of the detection target is detected, a detection target having a motion can be detected, but there is a problem that a stationary detection target cannot be detected.
　本発明は、上述した課題を解決するもので、静止している検出対象を検出することができる無線センサ装置を提供することを目的とする。 This invention solves the subject mentioned above, and aims at providing the radio | wireless sensor apparatus which can detect the stationary detection target.
　この課題を解決するために、請求項１に記載の無線センサ装置は、送信信号を放射し、送信信号が検出対象で反射した反射信号を受信するアンテナと、前記送信信号を生成し、前記送信信号を出力する出力端子を備えた送信回路と、前記送信回路の前記出力端子に接続され、前記送信回路から前記送信信号を送信中に、前記送信信号の一部と前記アンテナで受信された前記反射信号と、を検波する検波回路と、前記検波回路に接続され、前記検波回路から出力される信号を処理する信号処理回路と、前記送信回路に接続され、前記送信回路を制御する制御回路と、を有する無線センサ装置において、前記アンテナと前記出力端子との間に移相器を有し、前記制御回路は前記移相器を制御し、第１の移相量で送受信動作を行う第１の期間と、第２の移相量で送受信動作を行う第２の期間と、が交互に繰り返されるように制御するとともに、前記第１の期間の前記反射信号と、前記第２の期間の前記反射信号と、に基づく前記信号処理回路からの出力を演算することによって検出対象を検出することを特徴とする。 In order to solve this problem, a wireless sensor device according to claim 1 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. And the period of And the second period in which the transmission / reception operation is performed with the phase shift amount of 2 is alternately repeated, and the reflected signal in the first period and the reflected signal in the second period A detection target is detected by calculating an output from the signal processing circuit based on the detection target.
　また、請求項２に記載の無線センサ装置は、請求項１に記載の無線センサ装置において、前記第１の移相量と、前記第２の移相量の差はπ／４（ラジアン、以下ｒａｄと表す）であることを特徴とする。 The wireless sensor device according to claim 2 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 π / 4 (radian, hereinafter rad)).
　請求項１の発明によれば、制御回路は移相器を制御し、第１の移相量で送受信動作を行う第１の期間と、第２の移相量で送受信動作を行う第２の期間と、が交互に繰り返されるように制御するとともに、第１の期間の反射信号と、第２の期間の反射信号と、に基づく信号処理回路からの出力を演算することによって検出対象を検出するので、第１の期間の反射信号と第２の期間の反射信号から、互いに直交する成分を抽出することができる。このことによって、検出対象が静止物体であっても検出対象の有無を検出することができる。 According to the first aspect of the invention, 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.
　請求項２の発明によれば、第１の移相量と、第２の移相量の差をπ／４（ｒａｄ）としたので、第１の期間の反射信号と第２の期間の反射信号の位相差がπ／２（ｒａｄ）となり、互いに直交する成分を感度良く検出することができるので、検出対象が静止物体であっても感度良く検出することができる。 According to the second aspect of the present invention, since the difference between the first phase shift amount and the second phase shift amount is π / 4 (rad), the reflection signal in the first period and the reflection in the second period Since the phase difference of the signal is π / 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.
　以上により、本発明によれば、静止している検出対象を検出することができる無線センサ装置を提供することができる。 As described above, according to the present invention, it is possible to provide a wireless sensor device that can detect a stationary detection target.
本発明の実施形態に係る無線センサ装置の動作概要を示す図である。It is a figure which shows the operation | movement outline | summary of the wireless sensor apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る無線センサ装置の構成を示すブロック図である。It is a block diagram which shows the structure of the wireless sensor apparatus which concerns on embodiment of this invention. 本発明の実施形態に係る無線センサ装置の動作タイミング図である。It is an operation | movement timing diagram of the wireless sensor apparatus which concerns on embodiment of this invention. 従来技術の通信センサ装置の構成を示す図である。It is a figure which shows the structure of the communication sensor apparatus of a prior art.
　［実施形態］
　以下に本発明の実施形態における無線センサ装置について説明する。 [Embodiment]
A wireless sensor device according to an embodiment of the present invention will be described below.
　まず始めに本実施形態における無線センサ装置１００の動作概要について図１を用いて説明する。無線センサ装置１００は図１に示すように、送信信号を放射し、検出対象からの反射信号を検出し検出対象の検知を行う。 First, an outline of the operation of the wireless sensor device 100 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the wireless sensor device 100 radiates a transmission signal, detects a reflected signal from the detection target, and detects the detection target.
　次に無線センサ装置１００の構成について図２を用いて説明する。図２は無線センサ装置１００の構成を示すブロック図である。 Next, the configuration of the wireless sensor device 100 will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration of the wireless sensor device 100.
　無線センサ装置１００は図２に示すように、アンテナ１と、出力端子２ａを有する送信回路２と、検波回路３と、信号処理回路４と、制御回路５と、移相器６と、を備えている。 As shown in FIG. 2, 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.
　また無線センサ装置１００にはその他に図示しない電源回路を有しており、無線センサ装置１００の各部に動作に必要な電力を供給する。 In addition, 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.
　アンテナ１は、移相器６を介して送信回路２の出力端子２ａに接続されており、送信信号を放射し、送信信号が検出対象で反射した反射信号を受信する。 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.
　送信回路２は、送信信号を生成し、出力端子２ａに送信信号を出力する。 The transmission circuit 2 generates a transmission signal and outputs the transmission signal to the output terminal 2a.
　検波回路３は、送信回路２の出力端子２ａに接続され、送信回路２が送信信号を送信中に、出力端子２ａから出力される送信信号の一部と、アンテナ１から放射され検出対象で反射されてアンテナ１で受信された反射信号と、を検波する。 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.
　信号処理回路４は、検波回路３に接続され、検波回路３から出力される検波出力信号から、送信信号の周波数より高い周波数の信号を除去するローパスフィルタ（以下ＬＰＦと表す）の機能を少なくとも有し、検波回路３から出力される検波出力信号の信号処理を行い、その結果を制御回路５へ出力する。 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.
　制御回路５は、送信回路２と、信号処理回路４と、移相器６と、に接続されている。 The control circuit 5 is connected to the transmission circuit 2, the signal processing circuit 4, and the phase shifter 6.
　制御回路５は、送信回路２の動作状態を制御し、また信号処理回路４からの出力信号を取得し、検出対象からの呼吸に伴う体動や、心拍に伴う体表面の動き等の検出や検出有無の判断等を行う。 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.
　更に制御回路５は、移相器６を、第１の移相量で送受信動作を行う第１の期間と、第２移相量で送受信動作を行う第２の期間と、が交互に繰り返されるように制御する制御信号を出力する。 Further, the 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.
　移相器６は、制御回路５の制御信号に従い、送信信号に対し第１の移相量φ１を与える動作および、第１の移相量φ１に対しπ／４（ｒａｄ）大きな移相量を与える第２の移相量φ２を与える動作を行い、送信信号に与える移相量を変化させる。なお、第１の移相量φ１は０（零）（ｒａｄ）であっても、また所定の値となるように構成されていても良い。 The phase shifter 6 operates in accordance with the control signal of the control circuit 5 to give the first phase shift amount φ1 to the transmission signal and a phase shift amount larger by π / 4 (rad) than the first phase shift amount φ1. An operation of giving the second phase shift amount φ2 to be given is performed, and the phase shift amount given to the transmission signal is changed. Note that the first phase shift amount φ1 may be 0 (rad) or may be configured to have a predetermined value.
　次に、無線センサ装置１００の動作について図３を用いて説明する。 Next, the operation of the wireless sensor device 100 will be described with reference to FIG.
　制御回路５は、図３に示すように、時刻Ｔ１からＴ２までの時間ｔ１の間（第１の期間）に移相器６に第１の移相量φ１を与える制御信号Ｖ１を出力し、送信信号が出力端子２ａから出力されるように送信回路２を制御する送信出力制御信号を出力し、送信信号は、送信回路２の出力端子２ａから出力され移相器６で第１の移相量φ１を与えられ、アンテナ１から放射される。 As shown in FIG. 3, the control circuit 5 outputs a control signal V1 that gives a first phase shift amount φ1 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 φ1 is given and radiated from the antenna 1.
　アンテナ１から放射された送信信号の一部は、検出対象で反射され、反射信号としてアンテナ１で受信される。 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.
　アンテナ１で受信された反射信号は、移相器６で再び第１の移相量φ１を与えられて出力端子２ａまで戻り、送信中の送信信号の一部と反射信号と、が検波回路３に入力される。 The reflected signal received by the antenna 1 is again given the first phase shift amount φ1 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.
　送信信号の振幅をＡ、周波数をｆとしたときの角周波数２πｆをωとして、Ｖｏを（式１）で表し、反射信号の振幅をＢとして、Ｖｒを（式２）で表す、但し、θ１は第１の期間の送信信号Ｖｏに対する反射信号Ｖｒの位相変移角度（位相差）を表す。 When the amplitude of the transmission signal is A and the frequency is f, the angular frequency 2πf is ω, Vo is expressed by (Expression 1), the amplitude of the reflected signal is B, and Vr is expressed by (Expression 2), where θ1 Represents a phase shift angle (phase difference) of the reflected signal Vr with respect to the transmission signal Vo in the first period.
Ｖｏ＝Ａ・ｃｏｓωｔ・・・・・・（式１） Vo = A · cosωt (Equation 1)
Ｖｒ＝Ｂ・ｃｏｓ（ωｔ＋θ１）・・・（式２） Vr = B · cos (ωt + θ1) (Expression 2)
　前述のように、Ｂは反射信号の振幅であり、（式１）で表される振幅Ａでアンテナ１から放射された送信信号が、検出対象で反射されて再びアンテナ１まで戻ってくるまでの間の伝送路で受ける減衰（伝送損失）と、相信号が検出対象で反射される際の反射率によって受ける減衰（反射損失）によって、反射信号の振幅がＢまで減衰して受信されたことになる。 As described above, B is the amplitude of the reflected signal, and 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. Become.
　検波回路３で送信信号Ｖｏと反射信号Ｖｒの乗算が行われると、検波回路３の出力には（式３）で表される検波出力Ｖｄが出力される。 When the detection circuit 3 multiplies the transmission signal Vo and the reflected signal Vr, a detection output Vd represented by (Equation 3) is output to the output of the detection circuit 3.
Ｖｄ＝Ｖｏ×Ｖｒ
　　＝Ａ・Ｂ｛ｃｏｓωｔ・ｃｏｓ（ωｔ＋θ１）｝
　　＝（Ａ・Ｂ／２）ｃｏｓ（２ωｔ＋θ１）＋（Ａ・Ｂ／２）ｃｏｓθ１・・（式３） Vd = Vo × Vr
= A · B {cosωt · cos (ωt + θ1)}
= (A · B / 2) cos (2ωt + θ1) + (A · B / 2) cosθ1 ·· (Formula 3)
　（式３）の前半の項は、角周波数が２ωＴとなっており、送信周波数の２倍の周波数成分のため、信号処理回路４のＬＰＦ機能によって除去することができる。送信周波数の２倍の周波数成分が除去された第１期間の信号処理回路４の出力信号Ｖｐ１は、式（４）で表される。 In the first half of (Equation 3), the angular frequency is 2ωT, 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）ｃｏｓθ１・・・（式４） Vp1 = (A · B / 2) cos θ1 (Formula 4)
　Ｖｐ１は、検出対象が動くとその動きによってθ１が変化するので、θ１の変化によってＶｐ１が変化する。そのため、Ｖｐ１の変化を検出することで検出対象の動きを検出することができる。 Vp1 changes with the movement of the detection target, so that Vp1 changes with the change of θ1. Therefore, the motion of the detection target can be detected by detecting the change in Vp1.
　また、検出対象が静止物の場合には、検出対象との距離によってきまるθ１の値が一定のため、（式４）で算出される固定の値の直流信号が出力されることとなる。 Also, when the detection target is a stationary object, the value of θ1 determined by the distance to the detection target is constant, so that a fixed value DC signal calculated by (Equation 4) is output.
　制御回路５は、第１の期間の信号処理回路４の出力信号Ｖｐ１をアナログ・デジタル信号変換し、デジタル化されたデータとして制御回路５に含まれる記憶回路に記憶する。 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.
　制御回路５は、時刻Ｔ２で送信回路２から出力端子２ａに送信信号が出力されないように送信回路２を制御する送信出力制御信号を出力し、時刻Ｔ３までの時間ｔ２の間、送信動作を停止する。 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.
　次に、制御回路５が、時刻Ｔ３からＴ４までの時間ｔ１の間（第２の期間）に移相器６に第２の移相量φ２を与える制御信号Ｖ２を出力し、送信信号が出力端子２ａから出力されるように送信回路２を制御する送信出力制御信号を出力し、送信信号は、送信回路２の出力端子２ａから出力され移相器６で第２の移相量φ２を与えられ、アンテナ１から放射される。 Next, the control circuit 5 outputs the control signal V2 that gives the second phase shift amount φ2 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 φ2 by the phase shifter 6. And is radiated from the antenna 1.
　アンテナ１から放射された送信信号の一部は、検出対象で反射され、反射信号としてアンテナ１で受信される。 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.
　アンテナ１で受信された反射信号は、可変移相器６で再び第２の移相量φ２を与えられて出力端子２ａまで戻り、送信中の送信信号の一部と反射信号と、が検波回路３に入力される。 The reflected signal received by the antenna 1 is again given the second phase shift amount φ2 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.
　前述と同様に送信信号Ｖｏは（式１）で表わされ、反射信号Ｖｒは（式５）のように表される。但し、但しθ２は第２の期間の送信信号Ｖｏに対する反射信号Ｖｒの位相変移角度（位相差）を表す。 As described above, the transmission signal Vo is expressed by (Expression 1), and the reflected signal Vr is expressed by (Expression 5). However, (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（ωｔ＋θ２）・・・（式５） Vr = B · cos (ωt + θ2) (Formula 5)
　検波回路３の出力Ｖｄは、（式３）と同様に計算すると（式６）が得られる。 When the output Vd of the detection circuit 3 is calculated in the same manner as (Expression 3), (Expression 6) is obtained.
Ｖｄ＝Ｖｏ×Ｖｒ
　　＝Ａ・Ｂ｛ｃｏｓωｔ・ｃｏｓ（ωｔ＋θ２）｝
　　＝（Ａ・Ｂ／２）ｃｏｓ（２ωｔ＋θ２）＋（Ａ・Ｂ／２）ｃｏｓθ２・・（式６） Vd = Vo × Vr
= A · B {cosωt · cos (ωt + θ2)}
= (A · B / 2) cos (2ωt + θ2) + (A · B / 2) cosθ2 ·· (Formula 6)
　前述と同様に、（式６）の前半の項で示される信号成分が信号処理回路４のＬＰＦ機能によって除去された第２の期間の信号処理回路４の出力信号Ｖｐ２は、式（７）で表される。 Similarly to the above, the output signal Vp2 of the signal processing circuit 4 in the second period in which the signal component shown in the first half of (Expression 6) is removed by the LPF function of the signal processing circuit 4 is expressed by Expression (7). expressed.
Ｖｐ２＝（Ａ・Ｂ／２）ｃｏｓθ２・・・（式７） Vp2 = (A · B / 2) cos θ2 (Expression 7)
　Ｖｐ２もＶｐ１と同様に、検出対象が動くとその動きによってθ２が変化するので、θ２の変化によって出力が変化するが、検出対象が静止物の場合には、検出対象との距離によってきまるθ２の値が一定のため、（式７）で計算される固定の値の直流信号が出力されることとなる。 Similarly to Vp1, Vp2 also changes when θ2 changes due to the movement of the detection target. Therefore, when the detection target is a stationary object, θ2 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.
　制御回路５は、第２の期間の信号処理回路４の出力信号Ｖｐ２をアナログ・デジタル信号変換し、デジタル化されたデータ値として制御回路５に含まれる記憶回路に記憶する。 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.
　制御回路５は、時刻Ｔ４で送信回路２から送信信号が出力端子２ａに出力されないように送信回路２を制御する送信出力制御信号を出力し、時刻Ｔ５までの時間ｔ２の間、送信動作を停止する。時刻Ｔ５以降は時刻Ｔ１からの動作を同様に繰り返すよう動作する。 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.
　第１の期間の、送信信号Ｖｏに対する反射信号Ｖｒの位相変移角度を表すθ１は、送信信号が、出力端子２ａから出力され、移相器６によって与えられる第１の移相量φ１を与えられてアンテナ１に供給され、アンテナ１から放射されて検出対象で反射された反射信号がアンテナ１に戻ってくるまでの経路の長さによる移相量φｏと、アンテナ１から移相器６を経ることによって第１の移相量φ１を与えられ、出力端子２ａに戻ってくるまでの合計なので、（式８）のように表される。 Θ1 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 φ1 output from the output terminal 2a and given by the phase shifter 6. The phase shift amount φo 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. As a result, the first phase shift amount φ1 is given and the total amount of time until the output terminal 2a is returned is expressed as (Equation 8).
θ１＝φ１＋φｏ＋φ１＝φｏ＋２φ１・・・（式８） θ1 = φ1 + φo + φ1 = φo + 2φ1 (Equation 8)
　第２の期間の、送信信号Ｖｏに対する反射信号Ｖｒの位相変移角度を表すθ２は、送信信号が、出力端子２ａから出力され、移相器６によって与えられる第２の移相量φ２を与えられてアンテナ１に供給され、アンテナ１から放射されて検出対象で反射された反射信号がアンテナ１に戻ってくるまでの経路の長さによる移相量φｏと、アンテナ１から移相器６を経ることによって第２の移相量φ２を与えられ、出力端子２ａに戻ってくるまでの合計なので、（式９）のように表される。 Θ2 representing the phase shift angle of the reflected signal Vr with respect to the transmission signal Vo in the second period is given the second phase shift amount φ2 output from the output terminal 2a and given by the phase shifter 6. The phase shift amount φo 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. Thus, the second phase shift amount φ2 is given, and the total amount until the output terminal 2a is returned is expressed as (Equation 9).
θ２＝φ２＋φｏ＋φ２＝φｏ＋２φ２・・・（式９） θ2 = φ2 + φo + φ2 = φo + 2φ2 (Equation 9)
　第２の移相量φ２は、第１の移相量φ１よりπ／４（ｒａｄ）移相量が大きいのでφ２は（式１０）のように表すことができる。 Since the second phase shift amount φ2 is larger than the first phase shift amount φ1 by a π / 4 (rad) phase shift amount, φ2 can be expressed as (Equation 10).
φ２＝φ１＋π／４・・・（式１０） φ2 = φ1 + π / 4 (Expression 10)
　（式１０）を（式９）に代入すると（式１１）を得る。
θ２＝φｏ＋２（φ１＋π／４）＝θ１＋π／２・・・（式１１） Substituting (Equation 10) into (Equation 9) gives (Equation 11).
θ2 = φo + 2 (φ1 + π / 4) = θ1 + π / 2 (Expression 11)
　（式１１）を（式７）に代入すると、（式１２）を得ることができる。 (Equation 12) can be obtained by substituting (Equation 11) into (Equation 7).
Ｖｐ２＝（Ａ・Ｂ／２）ｃｏｓ（θ１＋π／２）
　　　＝－（Ａ・Ｂ／２）ｓｉｎθ１・・・（式１２） Vp2 = (A · B / 2) cos (θ1 + π / 2)
=-(A · B / 2) sin θ1 (Equation 12)
　以上のように、第１の期間に第１の移相量で送信信号を送信し、その反射信号を受信するとともに、第２の期間に第１の移相量よりπ／４（ｒａｄ）大きい移相量で送信信号を送信し、その反射信号を受信すると、第１の期間の反射信号と第２の期間の反射信号の位相差がπ／２（ｒａｄ）異なるので、互いに直交する成分を感度良く検出することができる。 As described above, the transmission signal is transmitted with the first phase shift amount in the first period, the reflected signal is received, and π / 4 (rad) larger than the first phase shift amount in the second period. When 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 π / 2 (rad). It can be detected with high sensitivity.
　制御回路５は、記憶したＶｐ１およびＶｐ２からそれぞれの２乗の値を合算し、（式１３）および（式１４）の計算結果を算出する。
（Ｖｐ１）２＋（Ｖｐ２）２＝（Ａ・Ｂ／２）２（ｓｉｎ２θ１＋ｃｏｓ２θ１）
であり、（ｓｉｎ２θ１＋ｃｏｓ２θ１）は１であるから 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 θ1 + cos 2 θ1)
And (sin 2 θ1 + cos 2 θ1) is 1.
（Ｖｐ１）２＋（Ｖｐ２）２＝（Ａ・Ｂ／２）２・・・（式１３） (Vp1) 2 + (Vp2) 2 = (A · B / 2) 2 (Expression 13)
　（式１３）は第１期間の反射信号から得られたＶｐ１と、第２期間の反射信号から得られたＶｐ２の２乗和であるので、信号処理回路の出力Ｖｐの大きさの絶対値｜Ｖｐ｜は（式１４）で求めることができる。 Since (Equation 13) is the sum of squares of Vp1 obtained from the reflected signal in the first period and Vp2 obtained from the reflected signal in the second period, the absolute value of the magnitude of the output Vp of the signal processing circuit | Vp | can be obtained by (Expression 14).
｜Ｖｐ｜＝√｛（Ｖｐ１）２＋（Ｖｐ２）２｝＝（Ａ・Ｂ／２）・・・（式１４） | Vp | = {{Vp1) 2 + (Vp2) 2 } = (A · B / 2) (Expression 14)
　（式１４）で示したように、反射信号から得られる信号処理回路４の出力Ｖｐ１およびＶｐ２を演算することによって、反射信号の移相量θ１およびθ２に依存しない｜Ｖｐ｜を検出することができるので、検出対象が静止物体であっても検出対象を検出することができる。 As shown in (Expression 14), by calculating the outputs Vp1 and Vp2 of the signal processing circuit 4 obtained from the reflected signal, | Vp | independent of the phase shift amounts θ1 and θ2 of the reflected signal can be detected. Therefore, the detection target can be detected even if the detection target is a stationary object.
　検出対象が無い場合には、検出対象で送信信号が反射されることはないので、（式１４）のＢが”０”（零）となり｜Ｖｐ｜も”０”（零）となる。また｜Ｖｐ｜≠０であれば反射信号が存在することとなり、送信信号を反射する検出対象が存在することとなる。 When there is no detection target, since the transmission signal is not reflected by the detection target, B in (Expression 14) becomes “0” (zero) and | Vp | also becomes “0” (zero). If | Vp | ≠ 0, a reflected signal exists, and a detection target that reflects the transmission signal exists.
　制御回路５は、（式１４）の計算を行った結果から、検出対象の有無を判断し、結果を出力する。 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.
　また、実験によって、アンテナ１から検出対象までの距離によって検出される｜Ｖｐ｜の値をあらかじめ記憶しておくことで、検出対象までの距離を推定することもできる。 In addition, the value of | Vp | 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.
　検出対象に動きがある場合、先述のように、検出対象の動きによって（式４）のθ１および（式７）のθ２が変化するので、第１の移相量で送受信動作を行う第１の期間のＶｐ１または、第２の移相量で送受信動作を行う第２の期間のＶｐ２の変動から検出対象の動きを検出することもできる。 When there is a motion in the detection target, as described above, θ1 in (Expression 4) and θ2 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.
　また、第２の移相量φ２が、第１の移相量φ１に対してπ／４（ｒａｄ）から更にΔθ（ｒａｄ）ずれた移相量であった場合には（式１０）は、下記のように表される。 Further, when the second phase shift amount φ2 is a phase shift amount further shifted by Δθ (rad) from π / 4 (rad) with respect to the first phase shift amount φ1, (Equation 10): It is expressed as follows.
φ２＝φ１＋π／４＋Δθ・・・（式１５） φ2 = φ1 + π / 4 + Δθ (Expression 15)
　（式１５）を（式９）に代入すると（式１６）を得る。
θ２＝φｏ＋２（φ１＋π／４＋Δθ）＝θ１＋π／２＋２Δθ・・・（式１６） Substituting (Equation 15) into (Equation 9) gives (Equation 16).
θ2 = φo + 2 (φ1 + π / 4 + Δθ) = θ1 + π / 2 + 2Δθ (Expression 16)
　（式１６）を（式７）に代入すると、（式１７）を得ることができる。 (Equation 17) can be obtained by substituting (Equation 16) into (Equation 7).
Ｖｐ２＝（Ａ・Ｂ／２）ｃｏｓ（θ１＋π／２＋２Δθ）
　　　＝－（Ａ・Ｂ／２）ｓｉｎ（θ１＋２Δθ）・・・（式１７） Vp2 = (A · B / 2) cos (θ1 + π / 2 + 2Δθ)
= − (A · B / 2) sin (θ1 + 2Δθ) (Expression 17)
　以上のように、第１の期間に第１の移相量で送信信号を送信し、その反射信号を受信するとともに、第２の移相量φ２が、第１の移相量φ１に対してπ／４（ｒａｄ）から更にΔθ（ｒａｄ）ずれた移相量であった場合であっても、π／４（ｒａｄ）からずれた移相量２Δθ（ｒａｄ）分の誤差は含まれるが、（式４）で表される第１の期間の反射信号と直交する成分を検出することができる。 As described above, 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 φ2 is smaller than the first phase shift amount φ1. Even when the phase shift amount is further shifted by Δθ (rad) from π / 4 (rad), an error corresponding to the phase shift amount 2Δθ (rad) shifted from π / 4 (rad) is included. A component orthogonal to the reflected signal in the first period represented by (Expression 4) can be detected.
　以上の説明したように、制御回路５が移相器６を制御し、第１の移相量で送受信動作を行う第１の期間と、第２移相量で送受信動作を行う第２の期間と、が交互に繰り返されるように制御するとともに、第１の期間の反射信号と第２の期間の反射信号と、に基づく信号処理回路４からの出力を演算するので、第１の期間の反射信号と第２の期間の反射信号から、互いに直交する成分を抽出することができる。このことによって、検出対象が静止物体であっても検出対象の有無を検出することができる。 As described above, the 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.
　第１の移相量と、第２の移相量の差をπ／４（ｒａｄ）としたので、第１の期間の反射信号と第２の期間の反射信号の位相差がπ／２（ｒａｄ）となり、で、検出対象が静止物体であっても感度良く検出することができる。 Since the difference between the first phase shift amount and the second phase shift amount is π / 4 (rad), the phase difference between the reflected signal in the first period and the reflected signal in the second period is π / 2 ( rad), and even if the detection target is a stationary object, it can be detected with high sensitivity.
　以上述べたように、本発明の実施形態による無線センサ装置１００によれば、静止している検出対象を検出することができる無線センサ装置を提供することができる。 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.
　以上のように、本発明の実施形態に係る無線センサ装置１００を具体的に説明したが、本発明は上記の実施形態に限定されるものではなく、要旨を逸脱しない範囲で種々変更して実施することが可能である。例えば次のように変形して実施することができ、これらの実施形態も本発明の技術的範囲に属する。 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.
　（１）本実施形態において、第１の移相量と第２の移相量の差がπ／４（ｒａｄ）の場合を例示して説明を行ったが、第１の移相量と第２の移相量の差をπ／４（ｒａｄ）から変更して実施しても良い。 (1) In this embodiment, the case where the difference between the first phase shift amount and the second phase shift amount is π / 4 (rad) has been described as an example. The difference between the two phase shift amounts may be changed from π / 4 (rad).
　（２）本実施形態において、検出対象が無い場合、出力Ｖｐが”０”（零）として説明したが、回路構成や使用部品のばらつき等で、検出対象がなくても若干の出力が出てしまう場合もあるので、検出対象の検出閾値を定めて検出対象の有無を判断するように構成しても良い。 (2) In the present embodiment, 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.
　（３）本実施形態において、１回の送信期間ごとに移相量を変更する例を示して説明したが、第１の移相量を与える第１の期間および第２の移相量を与える第２の期間に複数の送信動作を行う期間が含まれるよう制御しても良い。 (3) In the present embodiment, the example in which the phase shift amount is changed for each transmission period has been described. However, 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.
　（４）本実施形態において、信号処理回路４の機能をＬＰＦの機能のみにふれて説明を行ったが、そのほかに増幅、サンプリング等の機能を有していても良い。 (4) In the present embodiment, 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.
　（５）本実施形態において、制御回路５が、第１の期間の反射信号と第２の期間の反射信号と、に基づく信号処理回路４からの出力を演算する例を示して説明を行ったが、演算を行う機能は、信号処理回路が有していても良く、また制御回路や信号処理回路とは別に、独立した演算機能を備えて構成しても良い。 (5) In this embodiment, the 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. However, 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.
　（６）本実施形態において、送信信号に情報を与える変調を行わない構成で説明を行ったが、変調を行えるように構成しても良い、その場合、信号処理回路のＬＰＦ機能はカットオフ周波数を変調信号の周波数より低く設定するのが望ましい。 (6) Although the present embodiment has been described with a configuration that does not perform modulation that gives information to a transmission signal, the configuration may be such that modulation can be performed. In this case, the LPF function of the signal processing circuit has a cutoff frequency. Is preferably set lower than the frequency of the modulation signal.
　１　　　アンテナ
　２　　　送信回路
　２ａ　　出力端子
　３　　　検波回路
　４　　　信号処理回路
　５　　　制御回路
　６　　　移相器
　１００　無線センサ装置 DESCRIPTION OF SYMBOLS 1 Antenna 2 Transmission circuit 2a Output terminal 3 Detection circuit 4 Signal processing circuit 5 Control circuit 6 Phase shifter 100 Wireless sensor apparatus

Claims (2)

  1. 　送信信号を放射し、送信信号が検出対象で反射した反射信号を受信するアンテナと、
    　前記送信信号を生成し、前記送信信号を出力する出力端子を備えた送信回路と、
    　前記送信回路の前記出力端子に接続され、前記送信回路から前記送信信号を送信中に、前記送信信号の一部と前記アンテナで受信された前記反射信号と、を検波する検波回路と、
    　前記検波回路に接続され、前記検波回路から出力される信号を処理する信号処理回路と、
    　前記送信回路に接続され、前記送信回路を制御する制御回路と、を有する無線センサ装置において、
    　前記アンテナと前記出力端子との間に移相器を有し、
    　前記制御回路は前記移相器を制御し、第１の移相量で送受信動作を行う第１の期間と、第２の移相量で送受信動作を行う第２の期間と、が交互に繰り返されるように制御するとともに、
    　前記第１の期間の前記反射信号と、前記第２の期間の前記反射信号と、に基づく前記信号処理回路からの出力を演算することによって検出対象を検出することを特徴とする無線センサ装置。     An antenna that radiates a transmission signal and receives a reflected signal that is reflected from the detection target;
    A transmission circuit including an output terminal for generating the transmission signal and outputting the transmission signal;
    A detection circuit connected to the output terminal of the transmission circuit and detecting a part of the transmission signal and the reflected signal received by the antenna during transmission of the transmission signal from the transmission circuit;
    A signal processing circuit connected to the detection circuit and processing a signal output from the detection circuit;
    In a wireless sensor device having a control circuit connected to the transmission circuit and controlling the transmission circuit,
    Having a phase shifter between the antenna and the output terminal;
    The control circuit controls the phase shifter, and a first period in which transmission / reception operation is performed with a first phase shift amount and a second period in which transmission / reception operation is performed with a second phase shift amount are alternately repeated. As well as controlling
    A wireless sensor device that detects a detection target by calculating an output from the signal processing circuit based on the reflected signal in the first period and the reflected signal in the second period.
  2. 　請求項１に記載の無線センサ装置において、前記第１の移相量と、前記第２の移相量の差はπ／４（ラジアン）であることを特徴とする無線センサ装置。 2. The wireless sensor device according to claim 1, wherein a difference between the first phase shift amount and the second phase shift amount is π / 4 (radian).
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