CN109116309A - A kind of circuit structure simplifying double-side band Doppler radar using RF switch - Google Patents

A kind of circuit structure simplifying double-side band Doppler radar using RF switch Download PDF

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Publication number
CN109116309A
CN109116309A CN201811093915.6A CN201811093915A CN109116309A CN 109116309 A CN109116309 A CN 109116309A CN 201811093915 A CN201811093915 A CN 201811093915A CN 109116309 A CN109116309 A CN 109116309A
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China
Prior art keywords
signal
antenna
switch
double
way
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CN201811093915.6A
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Chinese (zh)
Inventor
马建国
杨自凯
周绍华
杨闯
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Tianjin University
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Tianjin University
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Priority to CN201811093915.6A priority Critical patent/CN109116309A/en
Priority to LU101011A priority patent/LU101011B1/en
Publication of CN109116309A publication Critical patent/CN109116309A/en
Pending legal-status Critical Current

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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
    • G01S13/50—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
    • 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
    • G01S13/88—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
    • 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
    • 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
    • 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
    • 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
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
    • 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

Abstract

The invention discloses a kind of circuit structures for simplifying double-side band Doppler radar using RF switch, including receiving antenna and transmitting antenna, receiving antenna has been sequentially connected in series low-noise amplifier, No.1 frequency mixer, bandpass filter, analog-digital converter and field programmable gate array；Transmitting antenna has been sequentially connected in series RF switch, power amplifier, power splitter and local oscillator；Power splitter output end is divided into two-way, wherein connecting power amplifier all the way, another way is connected to No.1 frequency mixer.Present invention reduces the costs of implementation of local oscillator, when the distance between radar and measured object change, no longer adjust the frequency of local oscillator；Two frequencies in the double-side band radar arrangement are produced, one is generated with local oscillator, another frequency utilization RF switch is realized, and then only needs a local oscillator, further decreases the cost of implementation of radar.

Description

A kind of circuit structure simplifying double-side band Doppler radar using RF switch
Technical field
The present invention relates to Doppler radar fields, simplify double-side band using RF switch more specifically, it relates to a kind of The circuit structure of Doppler radar.
Background technique
Microwave Doppler radar has also been employed that for many years that the most common application direction includes automobile speed as wireless sensor Degree measurement, weather perception and position and perceived distance.Since Lin in 1975 et al. attempts to utilize microwave Doppler radar for the first time The physiological movement of human body is measured, microwave Doppler radar has attracted as a kind of contactless life sign monitor system Very more attention [1].The mode of traditional detection vital sign parameter signals include ECG (electrocardiogram), heat or Pressure sensor, these types of mode require sensor contacts human body, and Long Term Contact can make one to generate uncomfortable feeling, even It is possible that influencing measurement accuracy, and for such as situations such as mental patient, burn patients, touch sensor is can not It uses, this severely limits the use scopes of touch sensor.Compared with traditional touch sensor, microwave Doppler One very important advantage of radar is that its detection vital sign parameter is non-intrusion type, i.e., does not relax without any will cause Suitable sense or the wearing sensor or cable for influencing test result.
In the past few decades, based on the vital signs detecting of continuous wave Doppler radar in experiment and practical application ring It is furtherd investigate in border, research finds the classical continuous wave radar structure using single channel frequency mixer, and there are Zeroes It [2], successively it has been proposed that can be with the quadrature demodulation structure [3] of effective solution Zeroes and based on transmitting for the defect The frequency regulation technology [4] of double-side band.Compared with quadrature demodulation structure, the frequency regulation technology based on double-side band is without generating just The local oscillation signal of friendship, it is also stronger to the rejection ability of direct current biasing [5].But when the distance between antenna and measured object become When change, frequency regulation technology needs to adjust the frequency of intermediate-freuqncy signal, and the intermediate-freuqncy signal generally uses local oscillator or crystal oscillator to realize, So it is more complicated in hardware realization to adjust the intermediate-freuqncy signal, higher cost；And frequency regulation technology needs to be mixed twice Baseband signal can be obtained, which increases system complexities and hardware cost.
Based on deficiency in the prior art, it is necessary to a kind of double-side band Doppler radar structure of simplification is proposed, to solve The shortcomings that existing double-side band radar arrangement.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, proposes that a kind of utilization RF switch simplifies double-side band The circuit structure of Doppler radar reduces the cost of implementation of local oscillator, when the distance between radar and measured object change, No longer adjust the frequency of local oscillator；Two frequencies in the double-side band radar arrangement are produced, one is generated with local oscillator, another Frequency utilization RF switch is realized, and then only needs a local oscillator, further decreases the cost of implementation of radar；In receiver part Point, the mixing of low frequency signal is realized in numeric field, so only needing a hardware frequency mixer, further decreases being implemented as radar This.
The purpose of the present invention is what is be achieved through the following technical solutions.
The circuit structure for simplifying double-side band Doppler radar using RF switch of the invention, including receiving antenna and transmitting Antenna, the receiving antenna have been sequentially connected in series low-noise amplifier, No.1 frequency mixer, bandpass filter, analog-digital converter and have showed Field programmable gate array；The transmitting antenna has been sequentially connected in series RF switch, power amplifier, power splitter and local oscillator；The function Device output end is divided to be divided into two-way, wherein connecting power amplifier all the way, another way is connected to No.1 frequency mixer.
The field programmable gate array plays the role of digital down, is equivalent to No. two frequency mixers interconnected and low Bandpass filter.
In transmitting terminal, radiofrequency signal is generated using local oscillator, radiofrequency signal is divided into two-way using power splitter later, one Road is used as transmitting signal, is used as the local oscillation signal of mixing all the way；Emit signal after power amplifier amplifies, using penetrating Frequency switch modulation, to generate double-sideband signal, which is launched by transmitting antenna；In receiving end, receive The double-sideband signal that antenna receives first passes through low-noise amplifier and amplifies, and is then mixed with local oscillation signal, mixing Intermediate-freuqncy signal afterwards first passes through bandpass filter and filters out direct current signal and high-frequency harmonic, then using analog-digital converter will in Frequency signal is converted into digital signal, finally carries out secondary mixing in programmable gate array at the scene, obtains final baseband signal.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
(1) this invention simplifies the structures of double-side band radar circuit, reduce the cost of implementation of double-side band Doppler radar, Reduce a local oscillator in transmitter section and substituted with RF switch, reduce a hardware frequency mixer in receiver section and It realizes and is mixed in numeric field.
(2) this invention simplifies the operating methods of double-side band Doppler radar, when the distance between radar and measured object are sent out When raw change, it is only necessary to adjust the frequency of RF switch using digital signal, this is simpler very than the frequency for adjusting local oscillator It is more.
Detailed description of the invention
Fig. 1 is the schematic diagram for the circuit structure that the present invention simplifies double-side band Doppler radar using RF switch.
Appended drawing reference: LO local oscillator, Power Divider power splitter, PA power amplifier, S RF switch, Tx_Antenna Transmitting antenna, Rx_Antenna receiving antenna, LNA low-noise amplifier, Mixer1 No.1 frequency mixer, Mixer2 bis- mixing Device, BPF bandpass filter, ADC analog-digital converter, LPF low-pass filter, FPGA field programmable gate array.
Specific embodiment
Illustrate technical solution of the present invention in order to clearer, the present invention will be further explained below with reference to the attached drawings.It is right For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings His attached drawing.
The circuit structure for simplifying double-side band Doppler radar using RF switch of the invention, as shown in Figure 1, including receiving Antenna Rx_Antenna and transmitting antenna Tx_Antenna, the receiving antenna Rx_Antenna have been sequentially connected in series low noise amplification Device LNA, No.1 frequency mixer Mixer1, bandpass filter BPF, analog-digital converter ADC and on-site programmable gate array FPGA.It is described Transmitting antenna Tx_Antenna has been sequentially connected in series RF switch S, power amplifier PA, power splitter Power Divider and local oscillator LO.The power splitter Power Divider output end is divided into two-way, wherein power amplifier PA input terminal is connected all the way, it is another Road is connected to No.1 frequency mixer Mixer1 input terminal.The on-site programmable gate array FPGA plays the role of digital down, phase When in No. two frequency mixer Mixer2 and low-pass filter LPF interconnected.
In transmitting terminal, radiofrequency signal is generated using local oscillator LO, utilizes power splitter Power Divider by radiofrequency signal later It is divided into two-way, is used as transmitting signal all the way, is used as the local oscillation signal of mixing all the way.Emit signal and passes through power amplifier After PA amplification, modulated using RF switch S, to generate double-sideband signal.The double-sideband signal passes through transmitting antenna Tx_ Antenna launches.In receiving end, the double-sideband signal that receiving antenna Rx_Antenna is received first passes through low noise amplification Device LNA is amplified, and is then mixed with local oscillation signal.Intermediate-freuqncy signal after mixing first passes through bandpass filter BPF will be straight Stream signal and high-frequency harmonic filter out, and intermediate-freuqncy signal is then converted into digital signal using analog-digital converter ADC.Finally existing Secondary mixing is carried out in field programmable gate array, obtains final baseband signal.In order to minimize baseband signal after mixing Residual phase noise drives local oscillator and field programmable gate array using same crystal oscillator.
If local oscillation signal L (t) is such as shown in formula (1):
L (t)=cos (2 π ft) (1)
In formula (1), f is the frequency of local oscillation signal, and t is the time.If the frequency of RF switch work is 1/2l, therefore its The rectangular wave that the period is 2l can be generated, Fourier expansion is carried out to it, then signal S (t) such as formula (2) institute that RF switch generates Show:
Amplitude is all smaller since Section 3 it can be seen from formula (2), can be omitted in calculating, therefore radio frequency is opened It closes the signal generated and only takes first two, as shown in formula (3):
It can be obtained by formula (1) and formula (3), emit signal T (t) as shown in formula (4):
Enable wavelength X=c/f, λ1=c/ (f+1/2l), λ2=c/ (f-1/2l), the wherein spread speed of c signal.According to more General Le effect can must receive signal R (t) as shown in formula (5):
In formula (5), d0For the distance between radar and measured object, x (t) is chest cavity movement.It enables and receives signal and local oscillator letter Number result R that is mixed and can must handle by bandpass filter1(t) as formula (6) is as follows:
To the signal R after mixing1(t) analog-to-digital conversion is carried out, and in the digital domain by R1(t) it is mixed with sin (π t/l) Frequently, baseband signal B (t) and after low-pass filter can be obtained as shown in formula (7):
According to document [5], it is known that when the relationship as shown in following formula (8) of satisfaction, measurement result is in the position of optimum point, i.e., Measurement result is most accurate.
When
When the relationship of the formula that is unsatisfactory for (8), due to λ1=c/ (f+1/2l), λ2=c/ (f-1/2l), therefore tune can be passed through The value of l is saved, i.e., by adjusting the frequency of RF switch to meet the relationship of optimum point.
Embodiment:
The model of specifically used component is described below in the present invention: local oscillator LO is using Analog Devices company LTC6948IUFD generates the frequency of 2.14GHz using the local oscillator；Power splitter Power Divider is using Anaren company PD0922J5050S2HF；RF switch S uses the 4239-52 of pSemi company；Power amplifier PA is remembered using bibliography [6] It carries；Transmitting antenna Tx_Antenna and receiving antenna Rx_Antenna is all made of using bibliography [7] record；Low noise Amplifier LNA uses the HMC618ALP3ETR of Analog Devices company；No.1 frequency mixer Mixer1 is all made of Analog The LT5575EUF of Devices company.Bandpass filter BPF is using Johanson Technology Inc. company 0400LP15A0122；Analog-digital converter ADC uses the ADC07D1520CIYB/NOPB of Texas Instruments company；It is existing Field programmable gate array FPGA uses the 5CSXFC6D6F31C6N of Intel Company.
[bibliography]
[1]Xiao Y,Lin J,Boric-Lubecke O,et al.A Ka-Band Low Power Doppler Radar System for Remote Detection ofCardiopulmonary Motion[J].2005,7:7151- 7154.
[2]DroitcourAD,Boric-Lubecke O,Lubecke V M,et al.Range correlation effect on ISM band I/Q CMOS radar for non-contact vital signs sensing[C] .Microwave Symposium Digest,2003IEEE MTT-S International.IEEE,2003:1945- 1948vol.3.
[3]Droitcour A D,Boric-Lubecke O,Lubecke V M,et al.Range correlation and I/Q performance benefits in single-chip silicon Doppler radars for noncontact cardiopulmonary monitoring[J].Microwave Theory&Techniques IEEE Transactions on,2004,52(3):838-848.
[4]Li C,Lin J,Xiao Y.Robust Overnight Monitoring ofHuman Vital Sign by a Non-contact Respiration and Heartbeat Detector[J].2006,1:2235-2238.
[5]Xiao Y,Lin J,Boric-Lubecke O,et al.Frequency-tuning technique for remote detection of heartbeat and respiration using low-power double-sideband transmission in the ka-band[J].IEEE Transactions on Microwave Theory& Techniques,2006,54(5):2023-2032.
[6]Q.Cheng,H.Fu,S.Zhu and J.Ma,“Two-Stage High-Efficiency Concurrent Dual-Band Harmonic-Tuned Power Amplifier,”IEEE Trans.Microw.Theory Techn., vol.64,no.10,pp.3232–3243,Oct.2016.
[7]W.An et al.,“Low-profile Wideband Slot-loaded Patch Antenna with Multi-Resonant Modes,”IEEE Antennas Wireless Propag.Lett.,to be published.
Although function and the course of work of the invention are described above in conjunction with attached drawing, the invention is not limited to Above-mentioned concrete function and the course of work, the above mentioned embodiment is only schematical, rather than restrictive, ability The those of ordinary skill in domain under the inspiration of the present invention, is not departing from present inventive concept and scope of the claimed protection situation Under, many forms can also be made, all of these belong to the protection of the present invention.

Claims (3)

1. a kind of circuit structure for simplifying double-side band Doppler radar using RF switch, including receiving antenna (Rx_Antenna) With transmitting antenna (Tx_Antenna), which is characterized in that the receiving antenna (Rx_Antenna) has been sequentially connected in series low noise and has put Big device (LNA), No.1 frequency mixer (Mixer1), bandpass filter (BPF), analog-digital converter (ADC) and field-programmable gate array It arranges (FPGA)；The transmitting antenna (Tx_Antenna) has been sequentially connected in series RF switch (S), power amplifier (PA), power splitter (Power Divider) and local oscillator (LO)；Output end is divided into two-way to the power splitter (Power Divider), wherein connecting all the way It connects power amplifier (PA), another way is connected to No.1 frequency mixer (Mixer1).
2. the circuit structure according to claim 1 for being simplified double-side band Doppler radar using RF switch, feature are existed In the field programmable gate array (FPGA) plays the role of digital down, is equivalent to No. two frequency mixers interconnected (Mixer2) and low-pass filter (LPF).
3. the circuit structure according to claim 1 for being simplified double-side band Doppler radar using RF switch, feature are existed In in transmitting terminal, radiofrequency signal being generated using local oscillator (LO), later using power splitter (Power Divider) by radiofrequency signal It is divided into two-way, is used as transmitting signal all the way, is used as the local oscillation signal of mixing all the way；Emit signal and passes through power amplifier (PA) it after amplifying, is modulated using RF switch (S), to generate double-sideband signal, which passes through transmitting antenna (Tx_Antenna) launch；In receiving end, the double-sideband signal that receiving antenna (Rx_Antenna) receives first passes through low Noise amplifier (LNA) amplifies, and is then mixed with local oscillation signal, and the intermediate-freuqncy signal after mixing first passes through bandpass filtering Device (BPF) filters out direct current signal and high-frequency harmonic, and intermediate-freuqncy signal is then converted into number using analog-digital converter (ADC) Signal finally carries out secondary mixing at the scene, obtains final baseband signal in programmable gate array (FPGA).
CN201811093915.6A 2018-09-19 2018-09-19 A kind of circuit structure simplifying double-side band Doppler radar using RF switch Pending CN109116309A (en)

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CN201811093915.6A CN109116309A (en) 2018-09-19 2018-09-19 A kind of circuit structure simplifying double-side band Doppler radar using RF switch
LU101011A LU101011B1 (en) 2018-09-19 2018-11-23 A circuit structure using radio frequency switch to simplify double-sideband doppler radar

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113030884A (en) * 2021-02-26 2021-06-25 隔空（上海）智能科技有限公司 Doppler radar testing device, Doppler radar testing method and Doppler radar sensor
WO2022233238A1 (en) * 2021-05-07 2022-11-10 华为技术有限公司 Detection device, radar, and terminal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101203773A (en) * 2005-04-22 2008-06-18 佛罗里达大学研究基金会有限公司 System and methods for remote sensing using double-sideband signals
CN105829910A (en) * 2013-12-20 2016-08-03 恩德莱斯和豪瑟尔两合公司 PRF frequency generator for a fill state measuring device
US20160336989A1 (en) * 2015-05-14 2016-11-17 University Of Florida Research Foundation, Inc. Low if architectures for noncontact vital sign detection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101203773A (en) * 2005-04-22 2008-06-18 佛罗里达大学研究基金会有限公司 System and methods for remote sensing using double-sideband signals
CN105829910A (en) * 2013-12-20 2016-08-03 恩德莱斯和豪瑟尔两合公司 PRF frequency generator for a fill state measuring device
US20160336989A1 (en) * 2015-05-14 2016-11-17 University Of Florida Research Foundation, Inc. Low if architectures for noncontact vital sign detection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113030884A (en) * 2021-02-26 2021-06-25 隔空（上海）智能科技有限公司 Doppler radar testing device, Doppler radar testing method and Doppler radar sensor
CN113030884B (en) * 2021-02-26 2024-03-29 隔空（上海）智能科技有限公司 Doppler radar testing device, testing method and Doppler radar sensor
WO2022233238A1 (en) * 2021-05-07 2022-11-10 华为技术有限公司 Detection device, radar, and terminal

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Application publication date: 20190101