LU101016B1 - A double -frequency circuit structure for implementing vital sign detection and short-distance positioning - Google Patents
A double -frequency circuit structure for implementing vital sign detection and short-distance positioning Download PDFInfo
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- LU101016B1 LU101016B1 LU101016A LU101016A LU101016B1 LU 101016 B1 LU101016 B1 LU 101016B1 LU 101016 A LU101016 A LU 101016A LU 101016 A LU101016 A LU 101016A LU 101016 B1 LU101016 B1 LU 101016B1
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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
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S7/032—Constructional details for solid-state radar subsystems
-
- 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
-
- 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
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
- G01S13/347—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal using more than one modulation frequency
-
- 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
-
- 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
- G01S7/28—Details of pulse systems
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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
- G01S7/354—Extracting wanted echo-signals
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/415—Identification of targets based on measurements of movement associated with the target
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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
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/0507—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves using microwaves or terahertz waves
-
- 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
- A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
- A61B5/1135—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing by monitoring thoracic expansion
-
- 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
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
- G01S7/034—Duplexers
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention discloses a double-frequency circuit structure for implementing vital sign detection and short-distance positioning, wherein a transmitting antenna (1) is connected in series with a power amplifier (2) and a first power divider (3), the first power divider (3) is connected with a second power divider (4) and a third power divider (5); output of the second power divider (4) is connected on one path with the first power divider (3), and connected on the other path with a first quadrature mixer (9) via a first bandpass filter (8); output of the third power divider (5) is connected on one path with the first power divider (3) and on the other path with a second quadrature mixer (11) via a second bandpass filter (10); a receiving antenna (12) is connected with a fourth power divider (13), output of the fourth power divider (13) is connected on one path with a third bandpass filter (14), a first low noise amplifier (15) and a first quadrature mixer (9) in series, and connected on the other path with a fourth bandpass filter (16), a second low noise amplifier (17) and a second quadrature mixer (11) in series. The present invention simplifies a Doppler radar circuit structure implementing vital sign detection and short-distance positioning, and reduces the costs of the Doppler radar circuit performing the two functions.
Description
A DOUBLE-FREQUENCY CIRCUIT STRUCTURE FOR IMPLEMENTING VITAL SIGN DETECTION AND SHORT-DISTANCE
POSITIONING
Field of the Disclosure
The present invention relates to the field of vital sign detection, short-distance positioning and circuits, and more specifically to a double-frequency circuit structure for implementing vital sign detection and short-distance positioning.
Background of the Disclosure
Vital sign detection and short-distance positioning are two very hot research programs at present, and are widely applied to fields such as consumer electronics, medical monitoring, auxiliary driving and robot indoor navigation (see reference [1]). As compared with conventional contact-type sensors and illumination-based sensors, microwave radars have advantages such as no need to contact, no dependency on illumination, and a strong penetration capability (see reference [2]). Nevertheless, microwave radars still have drawbacks in simultaneously implementing vital sign detection and short-distance positioning.
At present, a mainstream microwave radar structure comprises a single-frequency non-modulated continuous wave radar (see reference [3]), a pulse ultrawideband radar (see reference [4]), a frequency modulated continuous wave radar (see reference [5]) and a step frequency modulated continuous wave radar (see reference [6]). A signal transmitted by the single-frequency non-modulated continuous wave radar does not have a certain bandwidth, so it is difficult to obtain absolute distance information of the detected object. The pulse ultrawideband radar, the frequency modulated continuous wave radar and the step frequency modulated continuous wave radar may obtain absolute distance information. However, distance resolution of these radars depends on the bandwidth of the transmitted signal: the smaller the distance resolution is, the wider the desired signal bandwidth is. Thoracic movement caused by vital sign signals such as respiration and heartbeat is millimeter-scaled. To obtain vital sign information, a very wide working bandwidth is needed, which will improve complexity and costs of the radar circuit structure.
Based on drawbacks of conventional radar structures, it is necessary to propose a novel radar structure, to further reduce complexity and costs of the radar on the basis of implementing vital sign detection and short-distance positioning.
[References] [1] Peng Z, Munoz-Ferreras J M, Tang Y, et al. A Portable FMCW Interferometry Radar with Programmable Low-IF Architecture for Localization, ISAR Imaging, and Vital Sign Tracking [J]. IEEE Transactions on Microwave Theory & Techniques, 2017, PP (99):1-11.
[2] Wang G, Gu C, Inoue T, et al. A Hybrid FMCW-Interferometry Radar for Indoor Precise Positioning and Versatile Life Activity Monitoring [J], IEEE Transactions on Microwave Theory & Techniques, 2014, 62(11):2812-2822.
[3] Li C, Yu X, Lee C M, et al. High-Sensitivity Software-Configurable 5.8-GHz Radar Sensor Receiver Chip in 0.13-pm CMOS for Noncontact Vital Sign Detection[J]. IEEE Transactions on Microwave Theory & Techniques, 2010, 58(5):1410-1419.
[4] Lai J C Y, Xu Y, Gunawan E, et al. Wireless Sensing of Human Respiratory Parameters by Low-Power Ultrawideband Impulse Radio Radar[J], IEEE Transactions on Instrumentation & Measurement, 2011, 60(3):928-938.
[5] Mitomo T, Ono N, Hoshino H, et al. A 77 GHz 90 nm CMOS Transceiver for FMCW Radar Applications [J]. IEEE Journal of Solid-State Circuits, 2009, 45(4):928-937.
[6] Mercuri M, Ping J S, Pandey G, et al. Analysis of an Indoor Biomedical Radar-Based System for Health Monitoring[JJ. IEEE Transactions on Microwave Theory & Techniques, 2013, 61(5):2061-2068.
Summary of the Disclosure
An object of the present invention is to overcome drawbacks in the prior art and provide a novel double-frequency non-modulated continuous radar structure, namely, a double-frequency circuit structure for implementing vital sign detection and short-distance positioning, which simplifies a Doppler radar circuit structure for implementing vital sign detection and short-distance positioning, reduces costs of the Doppler radar circuit which implements the two functions, and reduces processing complexity of the baseband signal on the basis of the circuit structure.
An object of the present invention is achieved with the following technical solutions.
The double-frequency circuit structure for implementing vital sign detection and short-distance positioning according to the present invention comprises a transmitting antenna and a receiving antenna, the transmitting antenna is connected with a power amplifier, input of the power amplifier is connected with a first power divider, input of the first power divider is connected with a second power divider and a third power divider respectively, input of the second power divider is connected with a first local oscillator, and input of the third power divider is connected with a second local oscillator; output of the second power divider is divided into two paths: one path is connected with input of the first power divider, and the other path is connected to input of a first quadrature mixer via a first bandpass filter; output of the third power divider is divided into two paths: one path is connected to the input of the first power divider, and the other path is connected to input of a second quadrature mixer via a second bandpass filter.
The receiving antenna is connected with a fourth power divider, output of the fourth power divider is divided into two paths: one path is connected in series with a third bandpass filter, a first low noise amplifier and a first quadrature mixer in turn, and the other path is connected in series with a fourth bandpass filter, a second low noise amplifier and a second quadrature mixer in turn; output of the first quadrature mixer is connected with a first analog-digital converter and a second analog-digital 1 converter respectively, and the output of the second quadrature mixer is connected with a third analog-digital converter and a fourth analog-digital converter respectively.
The second power divider, third power divider and fourth power divider all employ a structure with one path of input and two paths of output, and the first power divider employs a structure with two paths of input and one path of output.
As compared with the prior art, the technical solutions of the present invention may bring about the following advantageous effects: (1) The present invention simplifies the circuit structure. Since the two frequencies generated by the radar are both continuous wave signals, they may be generated with the same local oscillator, thereby reducing complexity of the radar structure; (2) Since the structural complexity of the circuit is reduced, implementation costs of the circuit are also reduced; (3) It is only necessary to process continuous wave signals at the receiver portion, needless to process modulated signals. Relatively speaking, the signal processing complexity reduces substantially; (4) The present invention may simultaneously implement vital sign detection and short-distance positioning, and vital sign signals may be obtained through signals with two frequencies; the distance information may be obtained through a phase difference of two signals with similar frequencies; azimuth information may be measured bya rotating radar system; the distance information and the azimuth information may be combined to obtain short-distance positioning information; (5) A kemel idea of implementing the double-frequency radar according to the present invention is using two local oscillators to simultaneously generate signals with two frequencies, and simultaneously transmitting the signals with two frequencies via the transmitting antenna. At a receiving end, the receiving antenna is used to simultaneously receive the signals with two frequencies. To process the signals with two frequencies respectively, it is possible to use a filter to separate the signals with two frequencies and perform mixing respectively, and finally process the obtained baseband signal.
Brief Description of Drawings
Fig. 1 is a schematic diagram of a double-frequency circuit structure for implementing vital sign detection and short-distance positioning according to the present invention;
Fig. 2 is a layout of a double-frequency circuit structure for implementing vital sign detection and short-distance positioning according to the present invention.
Detailed Description of Preferred Embodiments
The present invention will be further described with reference to figures to more clearly illustrate the technical solution of the present invention. Those having ordinary skill in the art may further obtain other figures according to these figures without making any inventive efforts.
The double-frequency circuit structure for implementing vital sign detection and short-distance positioning according to the present invention has an entire circuit diagram as shown in Fig. 1, and comprises a transmitting antenna 1 and a receiving antenna 12. The transmitting antenna 1 is connected with a power amplifier 2, input of the power amplifier 2 is connected with a first power divider 3, input of the first power divider 3 is connected with a second power divider 4 and a third power divider 5 respectively, input of the second power divider 4 is connected with a first local oscillator 6, and input of the third power divider 5 is connected with a second local oscillator 7.
Output of the second power divider 4 is divided into two paths: one path is connected with input of the first power divider 3, and the other path is connected to input of a first quadrature mixer 9 via a first bandpass filter 8; output of the third power divider 5 is divided into two paths: one path is connected to the input of the first power divider 3, and the other path is connected to input of a second quadrature mixer 11 via a second bandpass filter 10.
The receiving antenna 12 is connected with a fourth power divider 13, output of the fourth power divider 13 is divided into two paths: one path is connected in series with a third bandpass filter 14, a first low noise amplifier 15 and a first quadrature mixer 9 in turn, and the other path is connected in series with a fourth bandpass filter 16, a second low noise amplifier 17 and a second quadrature mixer 11 in turn; output of the first quadrature mixer 9 is connected with a first analog-digital converter 18 and a second analog-digital converter 19 respectively, and the output of the second quadrature mixer 11 is connected with a third analog-digital converter 20 and a fourth analog-digital converter 21 respectively.
The second power divider 4, third power divider 5 and fourth power divider 13 all employ a structure with one path of input and two paths of output, and the first power divider 3 employs a structure with two paths of input and one path of output.
At a transmitting end, frequencies generated by the first local oscillator 6 and second local oscillator 7 are 1.67GHz and 2.06GHz respectively. To minimize residual phase noise of a baseband signal after mixing, the same crystal oscillator is used to drive two local oscillators. The generated two frequency signals are synthesized by using the first power divider 3, and the synthesized frequency signal is amplified by the power amplifier 2 and then transmitted out via the transmitting antenna 1. At a receiving end, the received signal is first divided by the four power divider 13 into two paths, then the two paths of signals respectively pass through the third bandpass filter 14 with a central frequency 1.67GHz and a fourth bandpass filter 16 with a central frequency 2.06GHz, so that each receiving channel only includes a signal of one frequency. Signal lines after the filtration are amplified by the first low noise amplifier 15 and second low noise amplifier 17 respectively, and then mixed with the local oscillator signals. To solve zero point problem, two paths of quadrature baseband signals are generated in a quadrature mixing manner. Finally, analog-digital converters (first analog-digital converter 18, second analog-digital converter 19, third analog-digital converter 20 and fourth analog-digital converter 21) are used to convert the baseband signal into a digital signal. 1 A manner of implementing vital sign detection is as follows. An amplitude change is neglected. Assuming the transmitted signal T(t) is as shown by Equation (1):
In Equation (1),/is a frequency of the transmitted signal, t is time, and </>(f) is a residual phase. A person’s thoracic movement generates a modulating action for the transmitted signal, and enables the transmitted signal to generate reflection. The reflected signal 7?(Z)received by the receiving antenna is as shown by Equation (2):
(2)
In Equation (2), d0 is a distance between the radar and the detected object, x(t) is thoracic movement of a human body, λ is a wavelength of the transmitted signal, and c is a light speed. The reflected signal is quadraturely mixed with the local oscillator signals to obtain a I channel baseband signal Bj(t) and a Q channel baseband signal Be(Z), respectively represented by Equations (3) and (4): (3) (4)
In the above Equations (3) and (4), A/ (z) is a residual phase change quantity. A complex signal demodulation method is used to extract vital sign signals. The reconstructed complex signals are represented by Equation (5):
(5) A manner of implementing short-distance positioning is as follows. When the working frequencies of the double-frequency radar are /and/, the calculated distance information is as shown in Equation (6):
I (6) where, <pi(/)and <p2(t) are respectively baseband phases of /land ^frequency channels, m is an integer, and 7?max is a maximum fuzzy distance. Azimuth information is measured by a rotating radar system, and the distance information and the azimuth information may be combined to obtain short-distance positioning information.
Embodiment A layout of the circuit designed according to the present invention is as shown in Fig. 2. Models of elements specifically used in the present invention are described below: the local oscillator 6 and second local oscillator 7 both employ LTC6948IUFD of Analog Devices, Inc. and is used to generate signals at two frequencies 1,67GHz and 2.06GHz; the first power divider 3, second power divider 4, third power divider 5 and fourth power divider 13 all employPD0922J5050S2HF of Anaren Inc.; the first bandpass filter 8 and third bandpass filter 14 with a central frequency 1.67GHz both employ TQQ7303 of TriQuint Inc.; the second bandpass filter 10 and fourth bandpass filter 16 with a central frequency 2.06GHz both employ 856738 of TriQuint Inc.; the first low noise amplifier 15 and second low noise amplifier 17 both employ HMC618ALP3ETR of Analog Devices, Inc.; the first quadrature mixer 9 and second quadrature mixer 11 both employ LT5575EUF of Analog Devices, Inc.
Although functions and operation process of the present invention are described above with reference to figures, the present invention is not limited to the above specific functions and operation process. The above specific implementation modes are only exemplary and unrestrictive. Those having ordinary skill in the art, as suggested or taught by the present invention, may further envisage many forms without departing from the essence of the present invention and extent of protection of claims, and all these forms fall within the extent of protection of the present invention.
Claims (2)
1. A double-frequency circuit structure for implementing vital sign detection and short-distance positioning, comprising a transmitting antenna (1) and a receiving antenna (12), characterized in that the transmitting antenna (1) is connected with a power amplifier (2), input of the power amplifier (2) is connected with a first power divider (3), input of the first power divider (3) is connected with a second power divider (4) and a third power divider (5) respectively, input of the second power divider (4) is connected with a first local oscillator (6), and input of the third power divider (5) is connected with a second local oscillator (7); output of the second power divider (4) is divided into two paths: one path is connected with input of the first power divider (3), and the other path is connected to input of a first quadrature mixer (9) via a first bandpass filter (8); output of the third power divider (5) is divided into two paths: one path is connected to the input of the first power divider (3), and the other path is connected to input of a second quadrature mixer (11) via a second bandpass filter (10); the receiving antenna (12) is connected with a fourth power divider (13), output of the fourth power divider (13) is divided into two paths: one path is connected in series with a third bandpass filter (14), a first low noise amplifier (15) and a first quadrature mixer (9) in turn, and the other path is connected in series with a fourth bandpass filter (16), a second low noise amplifier (17) and a second quadrature mixer (11) in turn; output of the first quadrature mixer (9) is connected with a first analog-digital converter (18) and a second analog-digital converter (19) respectively, and the output of the second quadrature mixer (11) is connected with a third analog-digital converter (20) and a fourth analog-digital converter (21) respectively.
2. The double-frequency circuit structure for implementing vital sign detection and short-distance positioning according to claim 1, characterized in that the second power divider (4), third power divider (5) and fourth power divider (13) all employ a structure with one path of input and two paths of output, and the first power divider (3) employs a structure with two paths of input and one path of output.
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| CN201811093928.3A CN109239708A (en) | 2018-09-19 | 2018-09-19 | A kind of double frequency circuit structure for realizing vital signs detecting and short distance positioning |
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| US10101438B2 (en) * | 2015-04-15 | 2018-10-16 | Texas Instruments Incorporated | Noise mitigation in radar systems |
| US10746851B2 (en) * | 2015-12-18 | 2020-08-18 | Texas Instruments Incorporated | Circuits and methods for determining chirp signal linearity and phase noise of a FMCW radar |
| TWI756993B (en) * | 2020-12-17 | 2022-03-01 | 國立中山大學 | Vital-sign radar sensor using wireless internet signal |
| CN114928370B (en) * | 2022-04-22 | 2023-06-06 | 杭州中科微电子有限公司 | Radio frequency structure applied to GNSS high-performance double-frequency active antenna |
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| US4513748A (en) * | 1983-08-30 | 1985-04-30 | Rca Corporation | Dual frequency heart rate monitor utilizing doppler radar |
| CN107358776A (en) * | 2017-08-23 | 2017-11-17 | 苏州豪米波技术有限公司 | Heartbeat detection radar system |
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