WO2016006468A1 - 無線センサ装置 - Google Patents
無線センサ装置 Download PDFInfo
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- WO2016006468A1 WO2016006468A1 PCT/JP2015/068379 JP2015068379W WO2016006468A1 WO 2016006468 A1 WO2016006468 A1 WO 2016006468A1 JP 2015068379 W JP2015068379 W JP 2015068379W WO 2016006468 A1 WO2016006468 A1 WO 2016006468A1
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- 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
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/36—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/358—Receivers using I/Q processing
Definitions
- the present invention relates to a wireless sensor device, and more particularly, to a wireless sensor device that detects movement of a detection target based on a transmission signal radiated to the detection target and a reflected signal from the detection target of the transmission signal.
- a wireless sensor device that includes a sensor unit and a signal processing unit and detects a movement of a detection target based on a transmission signal radiated to the detection target and a reflected signal from the detection target of the transmission signal has been put into practical use.
- Such a wireless sensor device is used as a biosensor for detecting an operation related to biometric information such as a person's breathing and heartbeat motion.
- FIG. 12 is an explanatory diagram showing the configuration of the radio frequency sensor 410 according to Patent Document 1. As shown in FIG.
- the radio frequency sensor 410 includes a local oscillator 411, an RF transmitter 412, an RF receiver 413, an amplifier 414, a mixer 415, and a low-pass filter 416.
- the radio frequency sensor 410 further includes an arithmetic control circuit (not shown).
- the local oscillator 411 generates a high frequency signal.
- the RF transmitter 412 radiates a high-frequency signal generated by the local oscillator 411 toward a subject (detection target) such as a human using an antenna of the RF transmitter 412.
- the RF receiver 413 receives a reflection signal from the subject (detection target) of the transmission signal radiated by the RF transmitter 412 using the antenna of the RF receiver 413.
- the amplifier 414 amplifies the reflected signal received by the RF receiver 413.
- the mixer 415 mixes a part of the transmission signal and the amplified reflected signal.
- the low-pass filter 416 removes noise components from the output signal of the mixer 415.
- the output signal of the low-pass filter 416 becomes an unprocessed sensor signal including information related to the subject's breathing, heartbeat motion, and the like.
- the unprocessed sensor signal is a signal corresponding to the phase difference between the transmission signal and the reflected signal.
- the radio frequency sensor 410 further includes an arithmetic control circuit (not shown).
- the arithmetic control circuit controls various circuits such as the local oscillator 411, the RF transmitter 412, the RF receiver 413, the amplifier 414, the mixer 415, and the low-pass filter 416. Further, the arithmetic control circuit obtains an unprocessed sensor signal from the low-pass filter 416, and calculates operation information related to operations such as breathing and heartbeat motion of the subject based on the acquired unprocessed sensor signal. In this way, the radio frequency sensor 410 detects the movement of the subject.
- the detection target moves while the movement of the detection target is detected and the distance between the wireless sensor device and the detection target changes, the level of the transmission signal and the reflection signal is correspondingly changed.
- the phase difference changes.
- the signal for detecting the motion of the detection target is generated using the phase difference between the transmission signal and the reflection signal, and therefore, the phase difference between the transmission signal and the reflection signal is used.
- the detection sensitivity when detecting the motion of the detection target is greatly reduced, making it difficult to detect the motion of the detection target.
- the detection sensitivity does not drop significantly, if the distance between the wireless sensor device and the detection target changes frequently and the phase difference between the transmitted signal and the reflected signal fluctuates accordingly, the detection target The phase and potential of the signal for detecting the movement of the movement also fluctuated, and the analysis of the operation of the detection target may be complicated. Even in such a case, the detection sensitivity when detecting the motion of the detection target is lowered.
- the present invention has been made in view of such a state of the art, and an object of the present invention is to provide a wireless sensor device that can suppress a decrease in detection sensitivity even if the distance between the wireless sensor device and a detection target changes. There is to do.
- the wireless sensor device generates a detection signal based on a transmission signal radiated to a detection target and a reflection signal of the transmission signal from the detection target.
- a signal processing unit that performs signal processing of the detection signal generated by the sensor unit, wherein the sensor unit is a phase state of the transmission signal or the reflected signal.
- the sensor unit corresponds to the first detection signal corresponding to the predetermined first phase state and the second phase state in which the phase of the transmission signal or the reflected signal is different from the first phase state. And a second detection signal. Therefore, even if the distance between the wireless sensor device and the detection target is changed and the detection sensitivity in one phase state of the first phase state and the second phase state is lowered, the phase is switched to the other phase state. Therefore, it is possible to create a state with good detection sensitivity.
- the signal is suitable for detecting phase information.
- the signal processing unit detects phase information based on the first detection signal and the second detection signal, and performs predetermined signal processing based on the detected phase information. Therefore, even when the distance between the wireless sensor device and the detection target frequently changes and the phase difference between the transmission signal and the reflected signal fluctuates, phase information is detected based on the first detection signal and the second detection signal. The signal can be corrected based on the detected phase information. As a result, it is possible to suppress a decrease in detection sensitivity accompanying a change in the distance between the wireless sensor device and the detection target.
- the second phase state is a phase state in which a phase of the reflected signal is different from the first phase state by ⁇ / 2 (radian), and the signal processing unit is A phase angle in orthogonal coordinates is calculated based on the first detection signal and the second detection signal, and signal phase correction is performed based on the calculated phase angle.
- the second phase state is a phase state in which the phase of the reflected signal is different from the first phase state by ⁇ / 2 (radian). Therefore, the first detection signal and the second detection signal corresponding to the two phase states are set as two coordinate components in the orthogonal coordinates, and the phase angle in the orthogonal coordinates is based on the first detection signal and the second detection signal. Can be easily calculated.
- the signal processing unit calculates the phase angle in the orthogonal coordinates based on the first detection signal and the second detection signal, and corrects the phase of the signal based on the calculated phase angle. Therefore, by performing phase correction of the signal, the signal before correction can be converted into a signal that is hardly affected by fluctuations in the phase angle. As a result, it is possible to further reduce the influence of the signal fluctuation accompanying the fluctuation of the phase difference between the transmission signal and the reflected signal, and further suppress the decrease in detection sensitivity.
- the second phase state is a phase state in which a phase of the reflected signal is delayed by ⁇ / 2 (radian) with respect to the first phase state
- the signal processing unit is First numerical information corresponding to a mixed signal of the first detection signal and the second detection signal, and second numerical information corresponding to a mixed signal of the first detection signal and the first detection signal
- the phase angle is calculated as an arctangent function with respect to a value obtained by dividing the first numerical information by the second numerical information.
- the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radians) with respect to the first phase state
- the first detection signal corresponding to the first phase state is obtained.
- the second detection signal corresponding to the second phase state can be used as the sine component in the orthogonal coordinates.
- the first numerical information is a signal corresponding to a mixed signal of the first detection signal and the second detection signal
- the first numerical information is a value proportional to the product of the first detection signal and the second detection signal, That is, the value is proportional to the product of the cosine function and the sine function with respect to the phase angle.
- the second numerical information is a signal corresponding to a mixed signal of the first detection signal and the first detection signal
- the second numerical information is a value proportional to the square of the first detection signal, that is, the phase angle.
- the value is proportional to the square of the cosine function. Therefore, the phase angle can be calculated using a simple calculation formula called an arc tangent function with respect to a value obtained by dividing the first numerical information by the second numerical information. As a result, the phase angle can be easily calculated.
- the second phase state is a phase state in which a phase of the reflected signal is delayed by ⁇ / 2 (radian) with respect to the first phase state
- the signal processing unit is First numerical information corresponding to a mixed signal of the first detection signal and the second detection signal, and third numerical information corresponding to a mixed signal of the second detection signal and the second detection signal
- the phase angle is calculated as an arctangent function with respect to a value obtained by dividing the third numerical information by the first numerical information.
- the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radians) with respect to the first phase state
- the first detection signal corresponding to the first phase state is obtained.
- the second detection signal corresponding to the second phase state can be used as the sine component in the orthogonal coordinates.
- the first numerical information is a signal corresponding to a mixed signal of the first detection signal and the second detection signal
- the first numerical information is a value proportional to the product of the first detection signal and the second detection signal, That is, the value is proportional to the product of the cosine function and the sine function with respect to the phase angle.
- the third numerical information is a signal corresponding to a mixed signal of the second detection signal and the second detection signal
- the third numerical information is a value proportional to the square of the second detection signal, that is, the phase angle.
- the value is proportional to the square of the sine function. Therefore, the phase angle can be calculated using a simple calculation formula called an arc tangent function with respect to a value obtained by dividing the third numerical information by the first numerical information. As a result, the phase angle can be easily calculated.
- the second phase state is a phase state in which a phase of the reflected signal is delayed by ⁇ / 2 (radian) with respect to the first phase state
- the signal processing unit is , First numerical information corresponding to a mixed signal of the first output signal and the second output signal, second numerical information corresponding to a mixed signal of the first output signal and the first output signal, and And the third numerical information corresponding to the mixed signal of the second output signal and the second output signal, and the phase angle as an arctangent function with respect to a value obtained by dividing the first numerical information by the second numerical information.
- a first calculated value is calculated
- a second calculated value of the phase angle is calculated as an arctangent function with respect to a value obtained by dividing the third numerical information by the first numerical information
- the first calculated value and the second calculated value A value that selects one of the calculated values, or The average value of the first calculation value and said second calculated value, characterized in that the calculated value of the phase angle.
- the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radians) with respect to the first phase state
- the first detection signal corresponding to the first phase state is obtained.
- the second detection signal corresponding to the second phase state can be used as the sine component in the orthogonal coordinates.
- the phase angle is calculated by calculating the phase angle as an arc tangent function for the value obtained by dividing the first numerical information by the second numerical information, and the arc tangent function for the value obtained by dividing the third numerical information by the first numerical information.
- the phase angle can be calculated using a simple mathematical formula, and the phase angle can be easily calculated.
- the first calculated value of the phase angle is calculated as an arctangent function with respect to the value obtained by dividing the first numerical information by the second numerical information, and the third numerical information is used as the first numerical information.
- a second calculated value of the phase angle is calculated as an arctangent function with respect to the divided value, and one of the first calculated value and the second calculated value is selected, or the first calculated value and the second calculated value The average value of the values is used as the calculated value of the phase angle.
- the other is used as the calculated value of the phase angle, or the first calculated value and the second calculated value
- the average value By using the average value as the calculated value of the phase angle, it is possible to suppress a decrease in detection sensitivity.
- the wireless sensor device wherein the sensor unit radiates the transmission signal and receives the reflected signal, a signal generation circuit that generates the transmission signal, and the first phase state. And a phase shifter that generates the second phase state, a first detection circuit to which a part of the transmission signal and the reflected signal corresponding to the first phase state are input, and a part of the transmission signal And a second detection circuit to which the reflected signal corresponding to the second phase state is input, and the signal processing unit is configured to input the first detection signal and the second detection signal.
- the sensor unit uses the phase shifter, the first detection circuit, and the second detection circuit, and corresponds to the first detection signal corresponding to the first phase state and the second phase state.
- the second detection signal can be easily generated.
- the signal processing unit can easily detect the phase information and perform signal processing using the phase detection circuit and the signal processing circuit. As a result, in the wireless sensor device having this configuration, the detection target operation can be easily detected.
- the wireless sensor device includes a plurality of the signal processing units, the signal processing unit having a predetermined pass band, and the first filter to which the first detection signal is input; And a second filter to which the second detection signal is input, wherein the predetermined pass band is different for each of the signal processing units.
- the wireless sensor device having this configuration it is possible to detect a plurality of different pieces of operation information from the detection target operations using a plurality of signal processing units. Moreover, when detecting a plurality of motion information, the frequency suitable for detection may differ for each motion information. In the wireless sensor device having this configuration, the pass band of the first filter and the pass band of the second filter are different. The signal processing unit has a different band. Therefore, it is possible to extract a frequency component suitable for detecting the operation for each signal processing unit from the detection signal output by the sensor unit. As a result, the wireless sensor device having this configuration can efficiently detect a plurality of operations with different detection targets.
- the present invention it is possible to provide a wireless sensor device that can suppress a decrease in detection sensitivity even if the distance between the wireless sensor device and a detection target changes.
- FIG. 1 is an explanatory diagram showing the configuration of the wireless sensor device 1 according to the first embodiment of the present invention.
- FIG. 1A is an explanatory diagram illustrating the overall configuration of the wireless sensor device 1
- FIG. 1B is an explanatory diagram illustrating the configuration of the wireless sensor device 1 in more detail.
- FIG. 2 is an explanatory diagram showing the configuration of the sensor unit 10 shown in FIG. 1 in more detail.
- FIG. 3 is an explanatory diagram showing the configuration of the signal processing unit 20 shown in FIG. 1 in more detail.
- FIG. 4 is an explanatory diagram showing the phase state of the reflected signal according to the first embodiment of the present invention.
- the horizontal axis represents time
- the vertical axis represents the phase of the reflected signal RX.
- the wireless sensor device 1 includes a sensor unit 10 and a signal processing unit 20 as shown in FIG.
- the wireless sensor device 1 detects the movement of the detection target 30 based on the transmission signal TX radiated to the detection target 30 and the reflection signal RX from the detection target 30 of the transmission signal.
- a wireless sensor device 10 is used as a biosensor or the like that detects an operation related to biometric information such as a person's breathing or heartbeat motion.
- the sensor unit 10 includes a transmission / reception antenna 11, a signal generation circuit 12, a phase shifter 13, a first detection circuit 14, a second detection circuit 15, and a control circuit 16.
- the transmission / reception antenna 11 is an antenna for radiating the transmission signal TX and receiving the reflection signal RX.
- the sensor unit 10 radiates the transmission signal TX as an electromagnetic wave signal to the detection target 30 using the transmission / reception antenna 11, and receives the reflection signal RX using the transmission / reception antenna 11.
- the signal generation circuit 12 includes an oscillator 12a and an amplifier 12b as shown in FIG.
- the oscillator 12a generates a high frequency signal having a predetermined frequency.
- the amplifier 12b amplifies the power of the high frequency signal generated by the oscillator 12a to a predetermined level.
- the output signal of the amplifier 12b is fed to the transmission / reception antenna 11 as the transmission signal TX.
- the signal generation circuit 12 generates the transmission signal TX when the oscillator 12a generates a high-frequency signal that becomes the transmission signal TX and amplifies the power of the high-frequency signal generated by the amplifier 12b.
- As the frequency of the transmission signal TX generated by the signal generation circuit 12 a 2.4 GHz band frequency or the like is used.
- the phase shifter 13 includes two transmission lines having different line lengths and two switch elements, and is disposed between the transmission / reception antenna 11 and the signal generation circuit 12.
- the two transmission lines are a first transmission line 13a and a second transmission line 13b.
- the two switch elements are a first switch element 13c and a second switch element 13d.
- the line length of the second transmission line 13b is set to be longer by 1/8 wavelength than the line length of the first transmission line 13a at the frequency of the transmission signal TX.
- the first switch element 13c and the second switch element 13d are switched in conjunction with each other, and the transmission / reception antenna 11 and the signal generation circuit 12 are either the first transmission line 13a or the second transmission line 13b. They are connected via one side.
- the state in which the transmission / reception antenna 11 and the signal generation circuit 12 are connected via the first transmission line 13a is referred to as a first phase state, and the transmission / reception antenna 11 and the signal generation circuit 12 are connected via the second transmission line 13b. The description will proceed with the state thus made as the second phase state.
- the transmission signal TX generated by the signal generation circuit 12 passes through the phase shifter 13 and is radiated to the detection target 30, and then passes through the phase shifter 13 again as the reflected signal RX. Therefore, the second phase state is a state where the phase of the reflected signal RX is delayed by an amount corresponding to a quarter wavelength with respect to the first phase state, that is, the phase of the reflected signal RX is ⁇ with respect to the first phase state.
- the phase is delayed by / 2 (radians).
- the first detection circuit 14 includes a mixer circuit 14a, a low-pass filter 14b, and a signal conversion circuit 14c.
- the mixer circuit 14a is connected to the signal generation circuit 12 side of the first transmission line 13a.
- the mixer circuit 14a receives a part of the transmission signal TX and the reflection signal RX corresponding to the first phase state, and outputs a mixed signal of the transmission signal TX and the reflection signal RX.
- the low-pass filter 14b receives the output signal of the mixer circuit 14a and outputs a low-frequency component of the mixed signal of the transmission signal TX and the reflection signal RX.
- the signal conversion circuit 14c receives the output signal of the low-pass filter 14b and outputs a digital signal obtained by quantizing the potential of the output signal of the low-pass filter 14b.
- the output signal of the signal conversion circuit 14c is the first detection signal Sa1 output from the first detection circuit 14. Since the first detection circuit 14 receives a part of the transmission signal TX and the reflected signal RX corresponding to the first phase state, the first detection signal Sa1 becomes a detection signal corresponding to the first phase state. .
- the potential A1 of the first detection signal Sa1 is a quantized value whose magnitude and sign change from moment to moment in response to the operation of the detection target 30 such as respiration and heartbeat.
- the second detection circuit 15 includes a mixer circuit 15a, a low-pass filter 15b, and a signal conversion circuit 15c.
- the mixer circuit 15a is connected to the signal generation circuit 12 side of the second transmission line 13b.
- the mixer circuit 15a receives a part of the transmission signal TX and the reflection signal RX corresponding to the second phase state, and outputs a mixed signal of the transmission signal TX and the reflection signal RX.
- the low-pass filter 15b receives the output signal of the mixer circuit 15a and outputs a low-frequency component of the mixed signal of the transmission signal TX and the reflection signal RX.
- the signal conversion circuit 15c receives the output signal of the low-pass filter 15b and outputs a digital signal obtained by quantizing the potential of the output signal of the low-pass filter 15b.
- the output signal of the signal conversion circuit 15c is the second detection signal Sa2 output from the second detection circuit 15. Since the second detection circuit 15 receives a part of the transmission signal TX and the reflected signal RX corresponding to the second phase state, the second detection signal Sa2 becomes a detection signal corresponding to the second phase state. .
- the potential A2 of the second detection signal Sa2 is a quantized value whose magnitude and sign change from moment to moment in response to the operation of the detection target 30 such as respiration and heartbeat.
- the control circuit 16 controls the switching timing of the phase state of the phase shifter 13. As shown in FIG. 4, when the period in which the first phase state is set is the first period t1, and the period in which the second phase state is set is the second period t2, the control circuit 16 performs the first period t1 and the second period t2.
- the sensor unit 10 is controlled so that and are alternately repeated.
- the switching cycle t0 which is the time obtained by adding the first period t1 and the second period t2, does not affect the first detection signal Sa1 and the second detection signal Sa2, and the first detection signal Sa1 and the second detection period Sa2. 2 is set to be sufficiently shorter than the period of the signal included in the detection signal Sa2.
- the signal processing unit 20 includes a phase detection circuit 21 and a signal processing circuit 22 as shown in FIG.
- the phase detection circuit 21 has two mixer circuits, two low-pass filters, and an arithmetic circuit 21g.
- the two mixer circuits are a mixer circuit 21a and a mixer circuit 21c.
- the two low-pass filters are a low-pass filter 21b and a low-pass filter 21d.
- the mixer circuit 21a has two input terminals and one output terminal.
- the first detection signal Sa1 and the second detection signal Sa2 are input to the two input terminals of the mixer circuit 21a, respectively, and the mixed signal of the first detection signal Sa1 and the second detection signal Sa2 from the output terminal of the mixer circuit 21a. Is output. Since the principle of the mixed signal generation by the mixer circuit is known, a detailed description is omitted, but when two signals are input to the mixer circuit, a mixed signal proportional to the product of the two input signals is output from the mixer circuit. .
- the low pass filter 21b levels the output signal of the mixer circuit 21a. Then, the potential of the output signal of the low-pass filter 21b becomes the first numerical information B1. Since the first numerical information B1 is numerical information obtained by leveling the mixed signal of the first detection signal Sa1 and the second detection signal Sa2, the potential A1 of the first detection signal Sa1 and the potential A2 of the second detection signal Sa2 The product is a value proportional to the leveled value.
- the mixer circuit 21c has two input terminals and one output terminal.
- the first detection signal Sa1 is input to the two input terminals of the mixer circuit 21c, and a mixed signal of the first detection signal Sa1 and the first detection signal Sa1 is output from the output terminal of the mixer circuit 21c.
- the low-pass filter 21d levels the output signal of the mixer circuit 21c. Then, the potential of the output signal of the low-pass filter 21d becomes the second numerical information B2. Since the second numerical information B2 is numerical information obtained by leveling the mixed signal of the first detection signal Sa1 and the first detection signal Sa1, the square of the potential A1 of the first detection signal Sa1 is proportional to the leveled value. The value to be
- the arithmetic circuit 21g is a circuit having a semiconductor for calculation. First numerical information B1 and second numerical information B2 are input to the arithmetic circuit 21g. Then, the arithmetic circuit 21g calculates a phase angle in orthogonal coordinates called IQ coordinates based on the first numerical information B1 and the second numerical information B2, and transmits the phase information regarding the calculated phase angle to the signal processing circuit 22. is doing.
- the IQ coordinates are orthogonal coordinates generally used in a digital modulation method called IQ modulation, but the orthogonal coordinates used in this embodiment are also referred to as IQ coordinates for convenience.
- the signal processing circuit 22 is a circuit having a signal processing semiconductor.
- the signal processing circuit 22 receives the first detection signal Sa1 and the second detection signal Sa2. Further, the phase information described above is transmitted from the phase detection circuit 21 to the signal processing circuit 22.
- the signal processing circuit 22 generates a pre-correction signal Sc for motion analysis based on the first detection signal Sa1 and the second detection signal Sa2, and corrects the pre-correction signal Sc based on the transmitted phase information. Is added to generate the correction signal Sd. Then, the signal processing circuit 22 analyzes the operation of the detection target 30 using the correction signal Sd, and outputs operation information Sout corresponding to the analysis result.
- FIG. 5 is an explanatory diagram relating to the phase correction method according to the first embodiment of the present invention.
- FIG. 5A is an explanatory diagram showing the state of the pre-correction signal Sc
- FIG. 5B is an explanatory diagram showing the state of the correction signal Sd.
- the horizontal axis is the I coordinate axis in the IQ coordinate
- the vertical axis is the Q coordinate axis in the IQ coordinate.
- the first detection signal Sa1 is a signal corresponding to the first phase state
- the second detection signal Sa2 is delayed in phase of the reflected signal by ⁇ / 2 (radian) with respect to the first phase state. It is a signal corresponding to the second phase state. Therefore, the first detection signal Sa1 and the second detection signal Sa2 can be used as an I coordinate component (cosine component) and a Q coordinate component (sine component) in orthogonal coordinates called IQ coordinates.
- the potential A1 of the first detection signal Sa1 is the I coordinate component of the pre-correction signal Sc and the potential A2 of the second detection signal Sa2 is the Q coordinate component of the pre-correction signal Sc.
- a signal Sc is generated.
- the pre-correction signal Sc generated in this way is a signal whose amplitude and phase change from moment to moment in response to the operation of the detection target 30 such as respiration and heartbeat. Then, when there is no disturbance noise or movement of the detection target 30, as shown in FIG. 5A, the pre-correction signal Sc passes through the origin and is a line segment L1 on the IQ coordinate where the angle with respect to the I coordinate axis is ⁇ . Fluctuates along.
- the I coordinate component of the pre-correction signal Sc at a certain moment is the instantaneous I coordinate component Ci
- the Q coordinate component is the instantaneous Q coordinate component Cq
- the amplitude (distance from the origin) is the instantaneous amplitude C. Further, the description will be made assuming that the angle ⁇ of the line segment L1 with respect to the I coordinate axis is the phase angle ⁇ of the signal Sc before correction.
- the potential A1 of the first detection signal Sa1 has a value proportional to the cosine function with respect to the phase angle ⁇
- the potential A2 of the second detection signal Sa2 has a value proportional to the sine function with respect to the phase angle ⁇ .
- phase angle ⁇ is an angle determined by the distance between the wireless sensor device 1 and the detection target 30, and when the distance between the wireless sensor device 1 and the detection target 30 changes, the wireless sensor device 1 and the detection target 30.
- the phase angle ⁇ also fluctuates in accordance with the change in the distance between and.
- the first numerical information B1 that is the output signal of the low-pass filter 21b is the product ((C ⁇ cos ⁇ ) ⁇ (C ⁇ ) of the potential A1 of the first detection signal Sa1 and the potential A2 of the second detection signal Sa2.
- sin ⁇ ) is a value proportional to the leveled value, that is, a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇ .
- the second numerical information B2 that is the output signal of the low-pass filter 21d is a value proportional to the leveled value of the square of the potential A1 of the first detection signal Sa1 ((C ⁇ cos ⁇ ) ⁇ 2), that is, The value is proportional to the square of the cosine function with respect to the phase angle ⁇ .
- the first numerical information B1 is a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇
- the second numerical information B2 is a value proportional to the square of the cosine function with respect to the phase angle ⁇ .
- the phase angle ⁇ can be calculated as an arctangent function (tan-1 (B1 / B2)) obtained by dividing the first numerical information B1 by the second numerical information B2.
- the phase detection circuit 21 calculates the phase angle ⁇ using the first numerical information B1 and the second numerical information B2 using such a relational expression, and outputs the phase angle ⁇ to the signal processing circuit 22 as phase information. .
- the signal processing circuit 22 corrects the pre-correction signal Sc based on the phase angle ⁇ to generate a correction signal Sd.
- the correction applied based on the phase information is performed by shifting the phase of the pre-correction signal Sc by an angle ⁇ obtained by inverting the sign of the phase angle ⁇ , as shown in FIG. 5B. is there. This is equivalent to converting the pre-correction signal Sc into a signal having the same instantaneous amplitude as the pre-correction signal Sc and a phase angle of zero.
- the I coordinate component of the correction signal Sd at a certain moment is the instantaneous I coordinate component Di
- the Q coordinate component is the instantaneous Q coordinate component Dq
- the amplitude (distance from the origin) is the instantaneous amplitude D
- the instantaneous I of the correction signal Sd The coordinate component Di has a value equal to the instantaneous amplitude D of the correction signal Sd, that is, a value equal to the instantaneous amplitude C of the pre-correction signal Sc.
- the instantaneous Q coordinate component Dq of the correction signal Sd is zero.
- the correction signal Sd is a signal that changes along the I coordinate axis in accordance with the change in the pre-correction signal Sc.
- the correction signal Sd converted into the phase angle 0 is affected by the fluctuation of the phase angle ⁇ even if the phase angle ⁇ varies due to the change in the distance between the wireless sensor device 1 and the detection target 30. It becomes a difficult signal.
- the signal processing circuit 22 analyzes the operation of the detection target 30 based on the time change of the correction signal Sd, and outputs operation information Sout corresponding to the analysis result. Since a method for analyzing the operation of the detection target 30 using such a correction signal Sd is known, a detailed description is omitted.
- the detection target 30 moves while the movement of the detection target 30 is detected and the distance between the wireless sensor device 1 and the detection target 30 changes, it responds accordingly. As a result, the phase difference between the transmission signal TX and the reflection signal RX changes. And in such an apparatus, since the detection signal for detecting the motion of the detection target 30 is generated using the phase difference between the transmission signal TX and the reflection signal RX, the transmission signal TX and the reflection signal RX are generated. When the phase difference becomes a specific condition called a null point, the detection sensitivity when detecting the movement of the detection target 30 is greatly reduced, and it may be difficult to detect the movement of the detection target 30.
- the detection sensitivity is greatly reduced, That is, the detection sensitivity is good when the phase difference between the transmission signal TX and the reflected signal RX is near ⁇ / 2 (radian) or near ⁇ / 2 (radian).
- the detection sensitivity does not greatly decrease, if the distance between the wireless sensor device 1 and the detection target 30 changes frequently and the phase difference between the transmission signal TX and the reflection signal RX fluctuates accordingly, Due to the influence, the amplitude and phase of the signal for analyzing the operation of the detection target 30 may also fluctuate, and the analysis of the operation of the detection target 30 may be complicated. Even in such a case, the detection sensitivity when detecting the movement of the detection target 30 is lowered.
- the sensor unit 10 includes the first detection signal Sa1 corresponding to the first phase state that is the phase state of the reflected signal RX, and the reflected signal for the first phase state.
- the second detection signal Sa2 corresponding to the second phase state in which the phase of RX is different is generated. Therefore, even if the distance between the wireless sensor device 1 and the detection target 30 changes and the detection sensitivity in one phase state of the first phase state and the second phase state decreases, the phase state changes to the other phase state. By switching, a state with good detection sensitivity can be created.
- the detection sensitivity in the first detection signal Sa1 corresponding to the first phase state is large.
- the phase difference between the transmission signal TX and the reflection signal RX in the second phase state becomes ⁇ / 2 (radian), and the detection sensitivity in the second detection signal Sa2 corresponding to the second phase state becomes good.
- the signal is suitable for detecting phase information.
- the signal processing unit 20 detects phase information based on the first detection signal Sa1 and the second detection signal Sa2, and performs predetermined signal processing based on the detected phase information. Therefore, even when the distance between the wireless sensor device 1 and the detection target 30 frequently changes and the phase difference between the transmission signal TX and the reflected signal RX varies, it is based on the first detection signal Sa1 and the second detection signal Sa2. Thus, the phase information can be detected, and the signal can be corrected based on the detected phase information. As a result, it is possible to suppress a decrease in detection sensitivity due to a change in the distance between the wireless sensor device 1 and the detection target 30.
- the second phase state is a phase state in which the phase of the reflected signal RX is different from the first phase state by ⁇ / 2 (radian). Therefore, the first detection signal Sa1 and the second detection signal Sa2 corresponding to such two phase states are used as two coordinate components in orthogonal coordinates called IQ coordinates, and the first detection signal Sa1 and the second detection signal Sa2
- the phase angle ⁇ in the IQ coordinate can be easily calculated using the first numerical information B1 and the second numerical information B2 based on the above.
- the signal processing unit 20 calculates the phase angle ⁇ in the IQ coordinates using the first numerical information B1 and the second numerical information B2 based on the first detection signal Sa1 and the second detection signal Sa2, and is calculated.
- the phase of the pre-correction signal Sc is corrected based on the phase angle ⁇ . Then, by performing phase correction of the pre-correction signal Sc, it is possible to convert the pre-correction signal Sc into a correction signal Sd that is hardly affected by fluctuations in the phase angle ⁇ . As a result, it is possible to further reduce the influence of the signal fluctuation accompanying the fluctuation of the phase difference between the transmission signal TX and the reflected signal RX, and further suppress the decrease in detection sensitivity.
- the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radians) with respect to the first phase state, and therefore the second phase state corresponds to the first phase state.
- the 1 detection signal Sa1 can be used as an I coordinate component (cosine component) in the IQ coordinate
- the second detection signal Sa2 corresponding to the second phase state can be used as a Q coordinate component (sine component) in the IQ coordinate. .
- the first numerical information B1 is numerical information obtained by leveling the mixed signal of the first detection signal Sa1 and the second detection signal Sa2, the first numerical information B1 is equal to the potential A1 of the first detection signal Sa1.
- the product ((C ⁇ cos ⁇ ) ⁇ (C ⁇ sin ⁇ )) of the detection signal Sa2 with the potential A2 is proportional to the leveled value, that is, proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇ .
- the second numerical information B2 is numerical information obtained by leveling the mixed signal of the first detection signal Sa1 and the first detection signal Sa1
- the second numerical information B2 is 2 of the potential A1 of the first detection signal Sa1.
- the power ((C ⁇ cos ⁇ ) ⁇ 2) is a value proportional to the leveled value, that is, a value proportional to the square of the cosine function with respect to the phase angle ⁇ . Therefore, the phase angle ⁇ can be calculated by using a simple calculation formula called an arctangent function (tan-1 (B1 / B2)) with respect to a value obtained by dividing the first numerical information B1 by the second numerical information B2. As a result, the phase angle ⁇ can be easily calculated.
- the phase angle ⁇ is calculated using the first numerical information B1 and the second numerical information B2 that are leveled by the low-pass filter 21b and the low-pass filter 21d, and based on the calculated phase angle ⁇ . Correction is applied to the signal Sc before correction.
- the phase angle is calculated using the first numerical information B1 and the second numerical information B2 leveled by the low-pass filter 21b and the low-pass filter 21d as described above. By calculating ⁇ , the influence of external noise can be reduced.
- the sensor unit 10 uses the phase shifter 13, the first detection circuit 14, and the second detection circuit 15, and the first detection signal Sa1 corresponding to the first phase state. And the second detection signal Sa2 corresponding to the second phase state can be easily generated.
- the signal processing unit 20 can easily perform detection of phase information such as the phase angle ⁇ and signal processing such as phase correction using the phase detection circuit 21 and the signal processing circuit 22. As a result, in the wireless sensor device 1 of the present embodiment, it is easy to detect the operation of the detection target 30.
- FIG. 6 is an explanatory diagram showing the configuration of the wireless sensor device 101 according to the second embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing the configuration of the signal processing unit 120 shown in FIG. 6 in more detail.
- the wireless sensor device 101 includes a sensor unit 10 and a signal processing unit 120 as shown in FIG. As illustrated in FIG. 6, the signal processing unit 120 includes a phase detection circuit 121 and a signal processing circuit 22. As described above, the wireless sensor device 101 is obtained by replacing the signal processing unit 20 of the wireless sensor device 1 according to the first embodiment with the signal processing unit 120. Further, the signal processing unit 120 is obtained by replacing the phase detection circuit 21 of the signal processing unit 20 with a phase detection circuit 121.
- the phase detection circuit 121 includes two mixer circuits, two low-pass filters, and an arithmetic circuit 21g.
- the two mixer circuits are a mixer circuit 21a and a mixer circuit 21e.
- the two low-pass filters are a low-pass filter 21b and a low-pass filter 21f.
- the phase detection circuit 121 is obtained by replacing the mixer circuit 21c and the low-pass filter 21d of the phase detection circuit 21 with the mixer circuit 21e and the low-pass filter 21f.
- the mixer circuit 21e has two input terminals and one output terminal.
- the second detection signal Sa2 is input to the two input terminals of the mixer circuit 21e, and a mixed signal of the second detection signal Sa2 and the second detection signal Sa2 is output from the output terminal of the mixer circuit 21e.
- the low-pass filter 21f levels the output signal of the mixer circuit 21e. Then, the potential of the output signal of the low-pass filter 21f becomes the third numerical information B3. Since the third numerical information B3 is numerical information obtained by leveling the mixed signal of the second detection signal Sa2 and the second detection signal Sa2, the square of the potential A2 of the second detection signal Sa2 ((C ⁇ sin ⁇ ) ⁇ 2 ) Becomes a value proportional to the leveled value.
- the configuration of the arithmetic circuit 21g is the same as that of the first embodiment, but the first numerical information B1 and the third numerical information B3 are input to the arithmetic circuit 21g. Then, the arithmetic circuit 21g uses the first numerical information B1 and the third numerical information B3 to calculate a phase angle ⁇ in orthogonal coordinates called IQ coordinates.
- the product ((C ⁇ cos ⁇ ) ⁇ (C ⁇ sin ⁇ )) of the potential A1 of the first detection signal Sa1 and the potential A2 of the second detection signal Sa2 is leveled.
- a value proportional to the converted value that is, a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇ .
- the third numerical information B3 is a value proportional to a value obtained by leveling the square of the potential A2 of the second detection signal Sa2 ((C ⁇ sin ⁇ ) ⁇ 2), that is, the phase angle ⁇ . It is a value proportional to the square of the sine function for.
- the first numerical information B1 is a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇
- the third numerical information B3 is a value proportional to the square of the sine function with respect to the phase angle ⁇ .
- the phase angle ⁇ can be calculated as an arctangent function (tan ⁇ 1 (B3 / B1)) obtained by dividing the third numerical information B3 by the first numerical information B1.
- the phase detection circuit 121 uses this relational expression as a phase tangent function (tan-1 (B3 / B1)) for a value obtained by dividing the third numerical information B3 by the first numerical information B1.
- the angle ⁇ is calculated and output to the signal processing circuit 22 as phase information.
- the signal processing circuit 22 generates the pre-correction signal Sc based on the first detection signal Sa1 and the second detection signal Sa2, and corrects the pre-correction signal Sc based on the phase angle ⁇ . Is added to generate the correction signal Sd. Then, the signal processing circuit 22 analyzes the operation of the detection target 30 using the correction signal Sd, and outputs operation information Sout corresponding to the analysis result.
- the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radian) with respect to the first phase state, and therefore the first detection corresponding to the first phase state.
- the signal Sa1 can be used as the I coordinate component (cosine component) in the IQ coordinate
- the second detection signal Sa2 corresponding to the second phase state can be used as the Q coordinate component (sine component) in the IQ coordinate.
- the first numerical information B1 is numerical information obtained by leveling the mixed signal of the first detection signal Sa1 and the second detection signal Sa2, the first numerical information B1 is equal to the potential A1 of the first detection signal Sa1.
- the product ((C ⁇ cos ⁇ ) ⁇ (C ⁇ sin ⁇ )) of the detection signal Sa2 with the potential A2 is proportional to the leveled value, that is, proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇ .
- the third numerical information B3 is numerical information obtained by leveling the mixed signal of the second detection signal Sa2 and the second detection signal Sa2, the third numerical information B3 is 2 of the potential A2 of the second detection signal Sa2.
- the power ((C ⁇ sin ⁇ ) ⁇ 2) is a value proportional to the leveled value, that is, a value proportional to the square of the sine function with respect to the phase angle ⁇ . Therefore, the phase angle ⁇ can be calculated by using a simple calculation formula called an arctangent function (tan-1 (B3 / B1)) with respect to a value obtained by dividing the third numerical information B3 by the first numerical information B1. As a result, the phase angle ⁇ can be easily calculated as in the first embodiment.
- FIG. 8 is an explanatory diagram showing the configuration of the wireless sensor device 201 according to the third embodiment of the present invention.
- FIG. 9 is an explanatory diagram showing the configuration of the signal processing unit 220 shown in FIG. 8 in more detail.
- the wireless sensor device 201 includes a sensor unit 10, a signal processing unit 220, and a control circuit 16, as shown in FIG. As illustrated in FIG. 8, the signal processing unit 220 includes a phase detection circuit 221 and a signal processing circuit 22. As described above, the wireless sensor device 201 is obtained by replacing the signal processing unit 20 of the wireless sensor device 1 according to the first embodiment with the signal processing unit 220. Further, the signal processing unit 220 is obtained by replacing the phase detection circuit 21 of the signal processing unit 20 with a phase detection circuit 221.
- the phase detection circuit 221 includes three mixer circuits, three low-pass filters, and an arithmetic circuit 21g as shown in FIG.
- the three mixer circuits are a mixer circuit 21a, a mixer circuit 21c, and a mixer circuit 21e.
- the three low-pass filters are a low-pass filter 21b, a low-pass filter 21d, and a low-pass filter 21f.
- the phase detection circuit 221 is obtained by adding the mixer circuit 21e and the low-pass filter 21f to the phase detection circuit 21.
- the mixer circuit 21e has two input terminals and one output terminal.
- the second detection signal Sa2 is input to the two input terminals of the mixer circuit 21e, and a mixed signal of the second detection signal Sa2 and the second detection signal Sa2 is output from the output terminal of the mixer circuit 21e.
- the low-pass filter 21f levels the output signal of the mixer circuit 21e. Then, the potential of the output signal of the low-pass filter 21f becomes the third numerical information B3. Since the third numerical information B3 is numerical information obtained by leveling the mixed signal of the second detection signal Sa2 and the second detection signal Sa2, the square of the potential A2 of the second detection signal Sa2 ((C ⁇ sin ⁇ ) ⁇ 2 ) Becomes a value proportional to the leveled value.
- the configuration of the arithmetic circuit 21g is the same as that of the first embodiment, but the first numerical information B1, the second numerical information B2, and the third numerical information B3 are input to the arithmetic circuit 21g. Then, the arithmetic circuit 21g calculates the phase angle ⁇ in orthogonal coordinates called IQ coordinates using the first numerical information B1, the second numerical information B2, and the third numerical information B3.
- the product ((C ⁇ cos ⁇ ) ⁇ (C ⁇ sin ⁇ )) of the potential A1 of the first detection signal Sa1 and the potential A2 of the second detection signal Sa2 is leveled.
- a value proportional to the converted value that is, a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇ .
- the second numerical information B2 is a value proportional to a leveled value of the square of the potential A1 of the first detection signal Sa1 ((C ⁇ cos ⁇ ) ⁇ 2), that is, The value is proportional to the square of the cosine function with respect to the phase angle ⁇ .
- the third numerical information B3 is a value proportional to the leveled value of the square of the potential A2 of the second detection signal Sa2 ((C ⁇ sin ⁇ ) ⁇ 2), that is, The value is proportional to the square of the sine function with respect to the phase angle ⁇ .
- the first numerical information B1 is a value proportional to the product of the cosine function and the sine function with respect to the phase angle ⁇
- the second numerical information B2 is a value proportional to the square of the cosine function with respect to the phase angle ⁇
- the phase detection circuit 221 uses these relational expressions as an arctangent function (tan ⁇ 1 (B1 / B2)) for a value obtained by dividing the first numerical information B1 by the second numerical information B2.
- the first calculation value of the phase angle ⁇ is calculated, and the second calculation of the phase angle ⁇ is performed as an arctangent function (tan ⁇ 1 (B3 / B1)) with respect to a value obtained by dividing the third numerical information B3 by the first numerical information B1.
- a value is calculated, and the first calculated value and the second calculated value are output to the signal processing circuit 22 as phase information.
- the signal processing circuit 22 generates the pre-correction signal Sc based on the first detection signal Sa1 and the second detection signal Sa2, and the phase of the pre-correction signal Sc based on the phase angle ⁇ .
- Correction signal Sd is generated by applying correction.
- the signal processing circuit 22 analyzes the operation of the detection target 30 using the correction signal Sd, and outputs operation information Sout corresponding to the analysis result.
- the signal processing circuit 22 selects one of the first calculated value and the second calculated value of the phase angle ⁇ according to a predetermined standard, and corrects using the calculated value on the selected side. The phase of the previous signal Sc is corrected.
- the signal processing circuit 22 determines the magnitude of the potential A1 (absolute Value) and the magnitude (absolute value) of the potential A2, the phase angle ⁇ is selected.
- the phase angle ⁇ is calculated by using the third numerical information B3 proportional to the square of A2. It is easier to increase the calculation accuracy of the phase angle ⁇ by calculating the phase angle ⁇ using the second numerical information B2 proportional to the square of A1. Therefore, in such a case, the first calculated value is selected as the phase angle ⁇ .
- the phase angle ⁇ is calculated using the second numerical information B2 proportional to the square of A1. It is easier to increase the calculation accuracy of the phase angle ⁇ by calculating the phase angle ⁇ using the third numerical information B3 proportional to the square of A2. Therefore, in such a case, the second calculated value is selected as the phase angle ⁇ .
- the wireless sensor device 201 of the present embodiment since the second phase state is a phase state in which the phase of the reflected signal is delayed by ⁇ / 2 (radian) with respect to the first phase state, the first detection corresponding to the first phase state
- the signal Sa1 can be used as the I coordinate component (cosine component) in the IQ coordinate
- the second detection signal Sa2 corresponding to the second phase state can be used as the Q coordinate component (sine component) in the IQ coordinate.
- the phase angle ⁇ is calculated by calculating the phase angle ⁇ as an arctangent function (tan ⁇ 1 (B1 / B2)) with respect to a value obtained by dividing the first numerical information B1 by the second numerical information B2, and a third numerical value.
- the calculation can be performed using two calculation methods, that is, a calculation method of calculating the phase angle ⁇ as an arctangent function (tan-1 (B3 / B1)) with respect to a value obtained by dividing the information B3 by the first numerical information B1.
- the phase angle ⁇ can be calculated using a simple mathematical formula, and the phase angle ⁇ can be easily calculated as in the first and second embodiments.
- the first calculated value of the phase angle ⁇ as an arctangent function (tan ⁇ 1 (B1 / B2)) with respect to a value obtained by dividing the first numerical information B1 by the second numerical information B2.
- a second calculated value of the phase angle ⁇ is calculated as an arctangent function (tan-1 (B3 / B1)) with respect to a value obtained by dividing the third numerical information B3 by the first numerical information B1.
- One of the value and the second calculated value is selected as the calculated value of the phase angle ⁇ . Therefore, even when the calculation accuracy of one of the first calculated value and the second calculated value is decreased, the decrease in detection sensitivity can be suppressed by using the other as the calculated value of the phase angle ⁇ .
- FIG. 10 is an explanatory diagram showing the configuration of the wireless sensor device 301 according to the fourth embodiment of the present invention.
- the wireless sensor device 301 includes a sensor unit 10 and two signal processing units 320 as shown in FIG. As shown in FIG. 11, the signal processing unit 320 includes a phase detection circuit 21, a signal processing circuit 22, a first filter 23, and a second filter 24. Thus, the wireless sensor device 301 is a wireless sensor device having a plurality of signal processing units. And the signal processing part 320 becomes the structure by which the 1st filter 23 and the 2nd filter 24 were added to the signal processing part 20 of 1st Embodiment.
- the first filter 23 is a band pass filter having a predetermined pass band at a low frequency.
- the first filter 23 receives the first detection signal Sa1 and extracts a predetermined frequency component suitable for the operation of the detection target 30 to be detected from the first detection signal Sa1.
- the output signal of the first filter 23 is input to the phase detection circuit 21 and the signal processing circuit 22 instead of the first detection signal Sa1.
- the second filter 24 is a bandpass filter having the same passband as the first filter 23.
- the second detection signal Sa2 is input to the second filter 24, and a predetermined frequency component suitable for the operation of the detection target 30 to be detected is extracted from the second detection signal Sa2.
- the output signal of the second filter 24 is input to the phase detection circuit 21 and the signal processing circuit 22 instead of the second detection signal Sa2.
- the pass band of the first filter 23 and the pass band of the second filter 24 are different for each signal processing unit 320.
- the pass band of the first filter 23 and the pass band of the second filter 24 are pass bands corresponding to human breathing (about 0.7 Hz to 1 Hz). It has become.
- the pass band of the first filter 23 and the pass band of the second filter 24 become a pass band (about 1 Hz to 2 Hz) corresponding to a human heartbeat operation. Yes.
- one of the two signal processing units 320 performs an operation analysis related to human breathing and outputs motion information related to human breathing.
- the other of the two signal processing units 320 performs an operation analysis related to a person's heartbeat motion, and outputs operation information related to the person's heartbeat motion.
- the wireless sensor device 301 of the present embodiment a plurality of different pieces of operation information can be detected from the operation of the detection target 30 using a plurality of signal processing units 320.
- the frequency suitable for detection may differ for each motion information.
- the passband of the first filter 23 and the frequency of the second filter 24 are different.
- the pass band is a band different for each signal processing unit 320. Therefore, a frequency component suitable for detecting the operation can be extracted for each signal processing unit 320 from the detection signal output from the sensor unit 10.
- the wireless sensor device 301 of the present embodiment can efficiently detect a plurality of operations with different detection targets 30.
- the operation detected in the embodiment of the present invention may be an operation other than that described above.
- the detected operation may be an operation other than breathing such as a human pulsation or a heartbeat operation.
- the detected operation may be a periodic operation of an object other than a person.
- the transmission / reception antenna 11 may be an antenna in which a transmission antenna and a reception antenna are combined.
- a circuit such as a filter or an amplifier may be connected to the transmission antenna and the reception antenna.
- the frequency of the transmission signal TX generated by the signal generation circuit 12 may be a frequency other than those described above.
- the frequency of the transmission signal TX may be a frequency of several hundred MHz band or 5 GHz band.
- the configuration of the phase shifter 13 may be a configuration other than that described above as long as it can be switched to two phase states.
- the phase shifter 13 may have a configuration in which a variable capacitance element or the like is connected to an end of a transmission line having a predetermined line length.
- the first detection circuit 14 and the second detection circuit 15 may be input with transmission signals TX in two different phase states.
- the first detection circuit 14 and the second detection circuit 15 may receive the reflection signal RX having the same phase state.
- the reduction in detection sensitivity occurs due to the phase difference between the transmission signal TX and the reflection signal RX.
- the reflection signal RX having two different phase states is used. The same effects as when used can be obtained.
- the first detection circuit 14 of the sensor unit 10 does not have the signal conversion circuit 14c, and the second detection circuit 15 may not have the signal conversion circuit 15c.
- the first detection signal Sa1 and the second detection signal Sa2 are analog detection signals. Even if the first detection signal Sa1 and the second detection signal Sa2 are analog detection signals, the same effect is obtained. Can be obtained.
- the phase detection circuit 221 determines on the phase detection circuit 221 side which phase angle ⁇ calculated by the two calculation methods is to be transmitted to the signal processing circuit 22. Only phase information relating to one of the phase angles ⁇ calculated by the two calculation methods may be transmitted to the signal processing circuit 22.
- the signal processing circuit 22 selects one of the first calculated value and the second calculated value of the phase angle ⁇ , and uses the calculated value on the selected side as the phase angle ⁇ .
- the signal processing circuit 22 may use the average value of the first calculated value and the second calculated value as the calculated value of the phase angle ⁇ . Even in such a case, when the calculation accuracy of one of the first calculated value and the second calculated value is reduced, the influence of the calculated value on the side where the calculation accuracy is reduced is reduced, and the decrease in detection sensitivity is suppressed. be able to.
- the number of signal processing units 20 included in the wireless sensor device 301 may be three or more.
- the signal processing unit included in the wireless sensor device 301 is not the signal processing unit 20 shown in the first embodiment, but the signal processing unit 120 shown in the second embodiment and the signal processing unit 220 shown in the third embodiment. It doesn't matter.
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Abstract
Description
以下、本考案の第1実施形態について図面を参照しながら説明する。まず、本発明の第1実施形態に係る無線センサ装置の構成について、図1ないし図4を用いて説明する。図1は、本発明の第1実施形態に係る無線センサ装置1の構成を示す説明図である。図1(a)は、無線センサ装置1の全体構成を示す説明図であり、図1(b)は、無線センサ装置1の構成をより詳しく示す説明図である。図2は、図1に示すセンサ部10の構成をより詳しく示す説明図である。図3は、図1に示す信号処理部20の構成をより詳しく示す説明図である。図4は、本発明の第1実施形態に係る反射信号の位相状態を示す説明図である。図4において、横軸は時間であり、縦軸は反射信号RXの位相である。
以下、本発明の第2実施形態について図面を参照しながら説明する。尚、本実施形態において、前述した第1実施形態と同一の構成である場合、同一符号を付して詳細な説明は省略する。
以下、本発明の第3実施形態について図面を参照しながら説明する。尚、本実施形態において、前述した第1実施形態や第2実施形態と同一の構成である場合、同一符号を付して詳細な説明は省略する。
以下、本発明の第4実施形態について図面を参照しながら説明する。尚、本実施形態において、前述した第1実施形態と同一の構成である場合、同一符号を付して詳細な説明は省略する。
10 センサ部
11 送受信アンテナ
12 信号発生回路
12a 発振器
12b 増幅器
13 移相器
13a 第1伝送線路
13b 第2伝送線路
13c 第1スイッチ素子
13d 第2スイッチ素子
14 第1検波回路
14a ミキサ回路
14b ローパスフィルタ
14c 信号変換回路
15 第2検波回路
15a ミキサ回路
15b ローパスフィルタ
15c 信号変換回路
16 制御回路
20 信号処理部
21 位相検出回路
21a ミキサ回路
21b ローパスフィルタ
21c ミキサ回路
21d ローパスフィルタ
21e ミキサ回路
21f ローパスフィルタ
21g 演算回路
22 信号処理回路
23 第1フィルタ
24 第2フィルタ
30 検知対象
101 無線センサ装置
120 信号処理部
121 位相検出回路
201 無線センサ装置
220 信号処理部
221 位相検出回路
301 無線センサ装置
320 信号処理部
Claims (7)
- 検知対象に放射される送信信号と前記送信信号の前記検知対象からの反射信号とに基づいて検知信号を生成するセンサ部と、
前記センサ部が生成した前記検知信号の信号処理を行う信号処理部と、
を備えた無線センサ装置であって、
前記センサ部は、
前記送信信号又は前記反射信号の位相状態である第1位相状態に対応した第1検知信号と、
前記第1位相状態に対して前記送信信号又は前記反射信号の位相が異なる第2位相状態に対応した第2検知信号と、
を生成し、
前記信号処理部は、
前記第1検知信号と前記第2検知信号とに基づいて位相情報を検出すると共に、
検出した前記位相情報に基づいて所定の信号処理を行うことを特徴とする無線センサ装置。 - 前記第2位相状態は、
前記第1位相状態に対して前記反射信号の位相がπ/2(ラジアン)だけ異なる位相状態であり、
前記信号処理部は、
前記第1検知信号と前記第2検知信号とに基づいて、
直交座標における位相角を算出し、
算出された前記位相角に基づいて、
信号の位相補正を行うことを特徴とする、
請求項1に記載の無線センサ装置。 - 前記第2位相状態は、
前記第1位相状態に対して前記反射信号の位相がπ/2(ラジアン)だけ遅れる位相状態であり、
前記信号処理部は、
前記第1検知信号と前記第2検知信号との混合信号に対応する第1数値情報と、
前記第1検知信号と前記第1検知信号との混合信号に対応する第2数値情報と、
を用い、
前記第1数値情報を前記第2数値情報で除した値に対する逆正接関数として前記位相角を算出することを特徴とする、
請求項2に記載の無線センサ装置。 - 前記第2位相状態は、
前記第1位相状態に対して前記反射信号の位相がπ/2(ラジアン)だけ遅れる位相状態であり、
前記信号処理部は、
前記第1検知信号と前記第2検知信号との混合信号に対応する第1数値情報と、
前記第2検知信号と前記第2検知信号との混合信号に対応する第3数値情報と、
を用い、
前記第3数値情報を前記第1数値情報で除した値に対する逆正接関数として前記位相角を算出することを特徴とする、
請求項2に記載の無線センサ装置。 - 前記第2位相状態は、
前記第1位相状態に対して前記反射信号の位相がπ/2(ラジアン)だけ遅れる位相状態であり、
前記信号処理部は、
前記第1出力信号と前記第2出力信号との混合信号に対応する第1数値情報と、
前記第1出力信号と前記第1出力信号との混合信号に対応する第2数値情報と、
前記第2出力信号と前記第2出力信号との混合信号に対応する第3数値情報と、
を用い、
前記第1数値情報を前記第2数値情報で除した値に対する逆正接関数として前記位相角の第1算出値を算出すると共に、
前記第3数値情報を前記第1数値情報で除した値に対する逆正接関数として前記位相角の第2算出値を算出し、
前記第1算出値と前記第2算出値とのうちの一方を選択した値か、又は、前記第1算出値と前記第2算出値との平均値を前記位相角の算出値とすることを特徴とする、
請求項2に記載の無線センサ装置。 - 前記センサ部は、
前記送信信号を放射し前記反射信号を受信するための送受信アンテナと、
前記送信信号を生成する信号発生回路と、
前記第1位相状態と前記第2位相状態とを発生させる移相器と、
前記送信信号の一部と前記第1位相状態に対応した前記反射信号とが入力される第1検波回路と、
前記送信信号の一部と前記第2位相状態に対応した前記反射信号とが入力される第2検波回路と、
を有し、
前記信号処理部は、
前記第1検知信号と前記第2検知信号とが入力される位相検出回路と、
前記第1検知信号と前記第2検知信号と前記位相情報とが入力される信号処理回路と、
を有することを特徴とする、
請求項1ないし請求項5のいずれかに記載の無線センサ装置。 - 複数の前記信号処理部を備え、
前記信号処理部は、
所定の通過帯域を有し、前記第1検知信号が入力される第1フィルタと、
前記所定の通過帯域を有し、前記第2検知信号が入力される第2フィルタと、
を有し、
前記所定の通過帯域は、
前記信号処理部毎に異なる帯域となっていることを特徴とする、
請求項6に記載の無線センサ装置。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3326525A1 (en) * | 2016-11-29 | 2018-05-30 | Samsung Electronics Co., Ltd. | Bio-signal processing apparatus and biometric information detection apparatus and method |
WO2019044195A1 (ja) * | 2017-08-31 | 2019-03-07 | 株式会社村田製作所 | 心拍測定装置 |
JP2020151458A (ja) * | 2019-03-12 | 2020-09-24 | キヤノンメディカルシステムズ株式会社 | 生体情報モニタ装置及び磁気共鳴イメージング装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070024487A1 (en) * | 2004-01-20 | 2007-02-01 | Zemany Paul D | Multiple frequency through-the-wall motion detection and ranging using a difference-based estimation technique |
JP2009538720A (ja) * | 2006-06-01 | 2009-11-12 | ビアンカメッド リミテッド | 生理的徴候を監視するための装置、システム、および方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6087972A (en) * | 1998-03-05 | 2000-07-11 | The Whitaker Corporation | Microwave sensor for object motion detection |
JP5377689B2 (ja) * | 2011-09-21 | 2013-12-25 | 斎藤 光正 | 定在波レーダー内蔵型led照明器具 |
JPWO2014057651A1 (ja) * | 2012-10-10 | 2016-08-25 | アルプス電気株式会社 | 無線センサ装置 |
-
2015
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070024487A1 (en) * | 2004-01-20 | 2007-02-01 | Zemany Paul D | Multiple frequency through-the-wall motion detection and ranging using a difference-based estimation technique |
JP2009538720A (ja) * | 2006-06-01 | 2009-11-12 | ビアンカメッド リミテッド | 生理的徴候を監視するための装置、システム、および方法 |
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Title |
---|
See also references of EP3167801A4 * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3326525A1 (en) * | 2016-11-29 | 2018-05-30 | Samsung Electronics Co., Ltd. | Bio-signal processing apparatus and biometric information detection apparatus and method |
KR20180060724A (ko) * | 2016-11-29 | 2018-06-07 | 삼성전자주식회사 | 생체 정보 처리 장치, 생체 정보 검출 장치 및 방법 |
US10506975B2 (en) | 2016-11-29 | 2019-12-17 | Samsung Electronics Co., Ltd. | Bio-signal processing apparatus and biometric information detection apparatus and method |
US10750998B2 (en) | 2016-11-29 | 2020-08-25 | Samsung Electronics Co., Ltd. | Bio-signal processing apparatus and biometric information detection apparatus and method |
US10856808B2 (en) | 2016-11-29 | 2020-12-08 | Samsung Electronics Co., Ltd. | Bio-signal processing apparatus and biometric information detection apparatus and method |
KR102580266B1 (ko) | 2016-11-29 | 2023-09-19 | 삼성전자주식회사 | 생체 정보 처리 장치, 생체 정보 검출 장치 및 방법 |
WO2019044195A1 (ja) * | 2017-08-31 | 2019-03-07 | 株式会社村田製作所 | 心拍測定装置 |
US11219382B2 (en) | 2017-08-31 | 2022-01-11 | Murata Manufacturing Co., Ltd. | Heartbeat measurement device |
JP2020151458A (ja) * | 2019-03-12 | 2020-09-24 | キヤノンメディカルシステムズ株式会社 | 生体情報モニタ装置及び磁気共鳴イメージング装置 |
JP7407598B2 (ja) | 2019-03-12 | 2024-01-04 | キヤノンメディカルシステムズ株式会社 | 生体情報モニタ装置及び磁気共鳴イメージング装置 |
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EP3167801A1 (en) | 2017-05-17 |
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