LU101015B1 - A double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection - Google Patents

A double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection Download PDF

Info

Publication number
LU101015B1
LU101015B1 LU101015A LU101015A LU101015B1 LU 101015 B1 LU101015 B1 LU 101015B1 LU 101015 A LU101015 A LU 101015A LU 101015 A LU101015 A LU 101015A LU 101015 B1 LU101015 B1 LU 101015B1
Authority
LU
Luxembourg
Prior art keywords
power divider
path
analog
quadrature mixer
bandpass filter
Prior art date
Application number
LU101015A
Other languages
German (de)
Inventor
Jianguo Ma
Shaohua Zhou
Zikai Yang
Original Assignee
Univ Tianjin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Univ Tianjin filed Critical Univ Tianjin
Application granted granted Critical
Publication of LU101015B1 publication Critical patent/LU101015B1/en

Links

Classifications

    • 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
    • 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
    • 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
    • G01S7/28—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
    • 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
    • A61B5/103—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
    • A61B5/1113—Local tracking of patients, e.g. in a hospital or private home
    • 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 present invention discloses a double-frequency double-receiving antenna circuit structure that may implement indoor life detection, wherein a transmitting antenna (1) is connected in series with a power amplifier (2) and a first power divider (3), the first power amplifier (3) is connected with a second power divider (4) and a third power divider (5); input of the second power divider (4) is connected with a first local oscillator (6), and output is connected with the first power divider (3) in one path and connected with a first quadrature mixer (9) via a first bandpass filter (8) in the other path; input of the third power divider (5) is connected with a second local oscillator (7), and its output is connected with the first power divider (3) in one path and connected with a fourth power divider (10) in the other path; the output of the fourth power divider (10) is connected with a second quadrature mixer (12) via a second bandpass filter (11) in one path, and connected with a third quadrature mixer (14) via a third bandpass filter (13) in the other path; a first receiving antenna (15) is connected with a fifth power divider (16), output of the fifth power divider (16) is connected in series with a fourth bandpass filter (17), a first low noise amplifier (18) and a first quadrature mixer (9) in one path, and in the other path connected in series with a fifth bandpass filter (19), a second low noise amplifier (20) and a second quadrature mixer (12); a second receiving antenna (21) is connected in series with a sixth bandpass filter (22), a third low noise amplifier (23) and a third quadrature mixer (14).

Description

A DOUBLE-FREQUENCY DOUBLE-RECEIVING ANTENNA CIRCUIT STRUCTURE CAPABLE OF IMPLEMENTING INDOOR LIFE DETECTION
Field of the Disclosure
The present invention relates to the field of vital sign detection, short-distance positioning and double-frequency circuits, and more specifically to a double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection.
Background of the Disclosure
Fields such as medical monitoring, assisted driving and robot indoor navigation need to detect vital sign information (including breathing and heat beat) and short-distance positioning information of a detected object, and the detection is substantively detecting relative displacement information and distance information of the detected object. To achieve the two functions, the microwave radar has advantages such as no need to contact the detected object, high sensitivity, no dependence on light radiation and strong penetration (see reference [1]). Nevertheless, a single-frequency microwave radar still has drawbacks in implementing short-distance positioning. To achieve the capability of detecting the distance, the transmitted signal must have a certain bandwidth. However, the signal transmitted by the single-frequency non-modulated continuous wave radar does not have a certain bandwidth, and therefore cannot obtain absolute distance information of the detected target. Recently some people propose a radar structure combining frequency-modulated continuous wave with single-frequency non-modulated continuous wave. This structure may simultaneously achieve vital sign detection and short-distance positioning. However, this radar needs two kinds of different signal sources, namely, frequency-modulated continuous wave and single-frequency non-modulated continuous wave. At the receiver portion, it is also necessary to process two different forms of signals. This not only increases the design difficulty and structural complexity of the radar, and makes the signal processing more complicated.
Based on drawbacks in the prior art, it is necessary to propose a radar structure which is simpler in structure and lower in costs, to achieve the vital sign detection and short-distance positioning.
[References] [1] 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.
Summary of the Disclosure
An object of the present invention is to overcome drawbacks in the prior art and provide a double-frequency double-receiving antenna circuit structure that may implement indoor life detection, which only uses one form of signal source and simplifies a radar circuit structure simultaneously achieving vital signal detection and short-distance positioning; two different forms of signals, namely, frequency-modulated continuous wave signal and single-frequency continuous wave signal, are not separated any more in the receiver portion, thereby simplifying signal processing complexity.
An object of the present invention is achieved with the following technical solutions.
The double-frequency double-receiving antenna circuit structure that may implement indoor life detection comprises a transmitting antenna, a first receiving antenna and a second receiving antenna.
The transmitting antenna is connected with a power amplifier, 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 output is divided into two paths: one path is connected with input of the first power divider, and 1 the other path is connected to input of a first quadrature mixer via a first bandpass filter; input of the third power divider is connected with a second local oscillator, and output is divided two paths: one path is connected with input of the first power divider, and the other path is connected with input of a fourth power divider; output of the fourth power divider is divided into two paths: one path is connected with input of a second quadrature mixer via a second bandpass filter, and the other path is connected to input of a third quadrature mixer via a third bandpass filter.
The first receiving antenna is connected with a fifth power divider, output of the fifth power divider is divided into two paths: one path is connected in series with a fourth bandpass filter, a first low noise amplifier and a first quadrature mixer in turn, and the other path is connected in series with a fifth bandpass filter, a second low noise amplifier and a second quadrature mixer; output of the first quadrature mixer is connected with a first analog-digital converter and a second analog-digital converter respectively, and output of the second quadrature mixer is connected with a third analog-digital converter and a fourth analog-digital converter respectively.
The second receiving antenna is connected in series with the sixth bandpass filter, the third low noise amplifier and the third quadrature mixer in turn, and output of the third quadrature mixer is connected with the fifth analog-digital converter and sixth analog-digital converter respectively.
At a transmitting end, a frequency ƒ generated by the first local oscillator is 1.67GHz, a frequency fa generated by the second local oscillator is 2.06GHz, the generated two frequency signals are synthesized by using the first power divider, amplified by the power amplifier and then transmitted by the transmitting antenna.
At a first receiving end, a first received signal received by the first receiving antenna first passes through the fifth power divider and is divided into two paths: one path passes through the fourth bandpass filter having a central frequency 1.67GHz, and the other path passes through the fifth bandpass filter having a central frequency 2.06GHz, then the first received signal is amplified by the first low noise amplifier and second low noise amplifier respectively, and mixed respectively with local oscillator signals at frequencies 1.67GHz, 2.06GHz; the first quadrature mixer and second quadrature mixer both respectively generate two paths of orthogonal first baseband signal and second baseband signal in a quadrature mixing manner; finally, the first analog-digital converter and second analog-digital converter are used to convert the first baseband signal into a digital signal, and the third analog-digital converter and fourth analog-digital converter are used to convert the second baseband signal into a digital signal.
At a second receiving end, the second received signal received by the second receiving antenna first passes through the sixth bandpass filter 22 having a central frequency 2.06GHz, then is amplified by the third low noise amplifier, and mixed with the local oscillator signal having a frequency 2.06GHz to generate two paths of quadrature third baseband signals, and finally the fifth analog-digital converter and sixth analog-digital converter are used to convert the third baseband signal into a digital signal.
As compared with the prior art, the technical solution of the present invention may bring about the following advantageous effects: (1) In the present invention, the signals of two frequencies at the transmitter portion are continuous, so the same local oscillator may be used to generate the signal, thereby simplifying the structure of the transmitter portion; at the receiver portion, hardware needn’t be used to separate two different forms of signals, thereby simplifying the structure of the receiver and thereby simplifying the overall structure of the radar. (2) In the present invention, it is unnecessary to separate two different forms of signals, thereby reducing the signal processing complexity. (3) A kernel idea of implementing the radar in the present invention is using two local oscillators to simultaneously generate signals with two frequencies, and then using the transmitting antenna to simultaneously transmit the signals with two frequencies. The first receiving antenna is used to simultaneously receive the signals with two frequencies. To process the signals with two frequencies, the filter is used to separate the signals with two frequencies and perform mixing respectively, then process the obtained baseband signal, and thereby obtain the vital sign signal and distance information. It is possible to use the second receiving antenna by virtue of the bandpass filter to receive the frequency/], and calculate an azimuth of the detected object by calculating a phase difference of the second baseband signal and the third baseband signal.
Brief Description of Drawings
Fig. 1 is a schematic diagram of a double-frequency double-receiving antenna circuit structure that may implement indoor life detection 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 double-receiving antenna circuit structure that may implement indoor life detection according to the present invention comprises a first receiving antenna 15, a second receiving antenna 21 and a transmitting antenna 1.
The transmitting antenna 1 is connected with a power amplifier 2, the power amplifier 2 is connected with the 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 output 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; input of the third power divider 5 is connected with a second local oscillator 7, and output is divided two paths: one path is connected with input of the first power divider 3, and the other path is connected with input of a fourth power divider 10; output of the fourth power divider 10 is divided into two paths: one path is connected with input of a second quadrature mixer 12 via a second bandpass filter 11, and the other path is connected to input of a third quadrature mixer 14 via a third bandpass filter 13.
The first receiving antenna 15 is connected with a fifth power divider 16, output of the fifth power divider 16 is divided into two paths: one path is connected in series with a fourth bandpass filter 17, a first low noise amplifier 18 and a first quadrature mixer 9 in turn, and the other path is connected in series with a fifth bandpass filter 18, a second low noise amplifier 20 and a second quadrature mixer 12; output of the first quadrature mixer 9 is connected with a first analog-digital converter 24 and a second analog-digital converter 25 respectively, and output of the second quadrature mixer 12 is connected with a third analog-digital converter 26 and a fourth analog-digital converter 27 respectively.
The second receiving antenna 21 is connected in series with a sixth bandpass filter 22, a third low noise amplifier 23 and a third quadrature mixer 14 in turn, and output of the third quadrature mixer 14 is connected with a fifth analog-digital converter 28 and a sixth analog-digital converter 29 respectively.
At a transmitting end, a frequency ƒ generated by the first local oscillator 6 is 1.67GHz, a frequency fo generated by the second local oscillator 7 is 2.06GHz, the generated two frequency signals are synthesized by using the first power divider 3, amplified by the power amplifier 2 and then transmitted by the transmitting antenna 1 ; at a first receiving end 32, a first received signal 30 received by the first receiving antenna 15 first passes through the fifth power divider 16 and is divided into two paths: one path passes through the fourth bandpass filter 17 having a central frequency 1.67GHz, and the other path passes through the fifth bandpass filter 19 having a central frequency 2.06GHz, then the first received signal 30 is amplified by the first low noise amplifier 18 and second low noise amplifier 20 respectively, and mixed respectively with local oscillator signals at frequencies 1.67GHz, 2.06GHz; the first quadrature mixer 9 and second quadrature mixer 12 both respectively generate two paths of orthogonal first baseband signal 34 and second baseband signal 35 in a quadrature mixing manner; finally, the first analog-digital converter 24 and second analog-digital converter 25 are used to convert the first baseband signal 34 into a digital signal, and the third analog-digital converter 26 and fourth analog-digital converter 27 are used to convert the second baseband signal 35 into a digital signal; at a second receiving end 33, the second received signal 31 received by the second receiving antenna 21 first passes through the sixth bandpass filter 22 having a central frequency 2.06GHz, then is amplified by the third low noise amplifier 23, and mixed with the local oscillator signal having a frequency 2.06GHz to generate two paths of quadrature third baseband signals 36, and finally the fifth analog-digital converter 28 and sixth analog-digital converter 29 are used to convert the third baseband signal 36 into a digital signal. A kernel idea of implementing the radar in the present invention is using two local oscillators to simultaneously generate signals with two frequencies, and then using the transmitting antenna 1 to simultaneously transmit the signals with two frequencies. The first receiving antenna 15 is used to simultaneously receive the signals with two frequencies. To process the signals with two frequencies, the filter is used to separate the signals with two frequencies and perform mixing respectively, then process the obtained baseband signal, and thereby obtain the vital sign signal and distance information. It is possible to use the second receiving antenna 21 by virtue of the bandpass filter to receive the frequency ƒ>, and calculate an azimuth of the detected object by calculating a phase difference of the second baseband signal 35 and the third baseband signal 36. A mode of implementing the vital sign detection is as follows. With amplitude changes being neglected, the transmitted signal T(t) is as shown by the following Equation (1): T(t) = cos(2x ft + φ(ί)) (1)
Where ƒ is a frequency of the transmitted signal, t is time, and φ(ί) is an initial phase. A person’s thoracic cavity motion plays a modulating role for the transmitted signal, and enables the transmitted signal to generate reflection. The reflection signal R(t) (namely, the first received signal 30 and second received signal 31) received by the first receiving antenna 15 and second receiving antenna 21 is as shown in Equation (2):
In Equation (2),d0 is a distance between the radar and the detected object, x(t) is a person’s thoracic cavity motion, c is a propagation speed of the signal, 2=c/f is a wavelength of the transmitted signal, and φ(ί-2ά(/<:) is a residual phase.
The reflection signal R(t) is mixed with the local oscillator signal to obtain baseband signals S/ijand Βρ(0 of channels I and 0 as shown in Equation (3):
In Equation (3) and (4), Ä^(t) is a residual phase. A complex signal demodulation method is used to extract vital signal signals, and rebuilt complex signals S(t)is shown in Equation (5):
(5) A mode of implementing short-distance positioning is as follows. When the working frequency of the double-frequency radar is /iandyS, if the phases of the first baseband signal 34 and second baseband signal 35 are ç>iand ^respectively, the calculated distance information D(t) is as shown in Equation (6):
(6)
In Equation (6), m is an integer related to the distance, and 7?max is a maximum fuzzy distance.
If the phases of the second baseband signal 35 and third baseband signal 36 are
ç>2and respectively, since the frequencies of the two are the same, the wavelength is set as λ, a horizontal distance between the first receiving antenna 15 and second receiving antenna 21 is d, a equation for calculating an azimuth is as shown in Equation (7):
(7)
Embodiment
Models of elements specifically used in the present invention are described below: the first local oscillator 6 and second local oscillator 7 both employ LTC6948IUFD of Analog Devices, Inc. and are used to generate two frequencies 1.67Gz and 2.06GHz; the first power divider 3, second power divider 4, third power divider 5, fourth power divider 10 and fifth power divider 16 all employ PD0922J5050S2HF of Anaren, Inc.; the first bandpass filter 8 and fourth bandpass filter 17of 1.67GHzboth employ TQQ7303 of TriQuint, Inc.; the second bandpass filter 11, third bandpass filter 13, fifth bandpass filter 19 and sixth bandpass filter 22 of 2.06GHzall employ 856738 of TriQuint, Inc.; the first low noise amplifier 18, second low noise amplifier 20 and third low noise amplifier 23 all employ HMC618ALP3ET of Analog Devices, Inc.; the first mixer 9, second mixer 12 and third mixer 14 all 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)

l.Schaltungsstruktur mit zwei Frequenzen und zwei Empfangsantennen, die eine Innenlebensdauerdetektion implementieren kann, dadurch gekennzeichnet, dass die Schaltungsstruktur eine Sendeantenne (1), eine erste Empfangsantenne (15) und eine zweite Empfangsantenne (21) umfasst; und dass die Sendeantenne (1) mit einem Leistungsverstärker (2) verbunden ist, und der Leistungsverstärker (2) mit einem ersten Leistungsteiler (3) verbunden ist, wobei der Eingang des ersten Leistungsteilers (3) jeweils mit einem zweiten Leistungsteiler (4) und einen dritten Leistungsteiler (5) verbunden ist, und wobei der Eingang des zweiten Leistungsteilers (4) mit einem ersten lokalen Oszillator (6) verbunden ist, und der Ausgang in zwei Pfade unterteilt ist: ein Pfad mit dem Eingang des ersten Leistungsteilers (3) verbunden ist, und der andere Pfad über einen ersten Bandpassfilter (8) mit dem Eingang eines ersten Quadraturmischers (9) verbunden ist, wobei der Eingang des dritten Leistungsteilers (5) mit einem zweiten lokalen Oszillator (7) verbunden ist, und der Ausgang in zwei Pfade unterteilt ist: ein Pfad mit dem Eingang des ersten Leistungsteilers (3) verbunden ist, und der andere Pfad mit dem Eingang eines vierten Leistungsteilers (10) verbunden ist, und wobei der Ausgang des vierten Leistungsteilers (10) in zwei Pfade unterteilt ist: ein Pfad über ein zweites Bandpassfilter (11) mit dem Eingang eines zweiten Quadraturmischers (12) verbunden ist, und der andere Pfad über ein drittes Bandpassfilter (13) mit dem Eingang einer dritten Quadraturmischer (14) verbunden ist; und dass die erste Empfangsantenne (15) mit einem fünften Leistungsteiler (16) verbunden ist, wobei der Ausgang des fünften Leistungsteilers (16) in zwei Pfade unterteilt ist: ein Pfad mit einem vierten Bandpassfilter (17), einem ersten rauscharmen Verstärkers (18) und einem ersten Quadraturmischer (9) hintereinander in Reihegeschaltet ist, und der andere Pfad mit einem fünften Bandpaßfilter (19), einem zweiten rauscharmen Verstärker (20) und einem zweiten Quadraturmischer (12) hintereinander in Reihegeschaltet ist, und wobei der Ausgang des ersten Quadraturmischers (9) jeweils mit einem ersten Analog-Digital-Wandler (24) und einem zweiten Analog-Digital-Wandler (25) verbunden ist, und der Ausgang des zweiten Quadratur-Mischers (12) jeweils mit einem dritten Analog-Digital-Wandler (26) und einem vierten Analog-Digital-Wandler (27) verbunden ist; und dass die zweite Empfangsantenne (21) mit dem sechsten Bandpassfilter (22), dem dritten rauscharmen Verstärker (23) und dem dritten Quadraturmischer (14) hintereinander in Reihegeschaltet ist, und der Ausgang des dritten Quadraturmischers (14) jeweils mit dem funften Analog-Digital-Wandler (28) und dem sechsten Analog-Digital-Wandler (29) hintereinander in Reihegeschaltet ist.A dual-frequency and dual-receive antenna circuit structure capable of implementing an inner-life detection, characterized in that the circuit structure comprises a transmitting antenna (1), a first receiving antenna (15) and a second receiving antenna (21); and that the transmitting antenna (1) is connected to a power amplifier (2), and the power amplifier (2) is connected to a first power divider (3), the input of the first power divider (3) each having a second power divider (4) and a third power divider (5) is connected, and wherein the input of the second power divider (4) is connected to a first local oscillator (6), and the output is divided into two paths: a path to the input of the first power divider (3) and the other path is connected to the input of a first quadrature mixer (9) via a first bandpass filter (8), the input of the third power divider (5) being connected to a second local oscillator (7) and the output in two paths is divided: one path is connected to the input of the first power divider (3), and the other path is connected to the input of a fourth power divider (10), and wherein the output of the fourth power divider (10) is divided into two paths: a path via a second bandpass filter (11) to the input of a second quadrature mixer (12) is connected, and the other path via a third bandpass filter (13) to the input of a third quadrature mixer (14) is connected; and in that the first receiving antenna (15) is connected to a fifth power divider (16), the output of the fifth power divider (16) being divided into two paths: a path having a fourth bandpass filter (17), a first low-noise amplifier (18) and a first quadrature mixer (9) is serially connected in series, and the other path is serially connected in series with a fifth bandpass filter (19), a second low noise amplifier (20) and a second quadrature mixer (12), and the output of the first quadrature mixer (9) is in each case connected to a first analog-digital converter (24) and a second analog-digital converter (25), and the output of the second quadrature mixer (12) is in each case connected to a third analog-to-digital converter ( 26) and a fourth analog-to-digital converter (27); and in that the second receiving antenna (21) is connected in series with the sixth bandpass filter (22), the third low-noise amplifier (23) and the third quadrature mixer (14), and the output of the third quadrature mixer (14) is connected in series with the fifth analogue Digital converter (28) and the sixth analog-to-digital converter (29) in series in series. 2. Schaltungsstruktur mit zwei Frequenzen und zwei Empfangsantennen, die eine Innenlebensdauerdetektion implementieren kann, gemäß Ansprueh 1, dadurch gekennzeichnet, dass an einem Sendeende eine Frequenz fj, die dureh den ersten lokalen Oszillator (6) erzeugt wird, 1,67 GHz ist, und eine Frequenz /2, die dureh den zweiten lokalen Oszillator (7) erzeugt wird, 2,06 GHz ist, wobei die erzeugten zwei Frequenzsignale unter Verwendung des ersten Leistungsteilers (3) synthetisiert, dureh den Leistungsverstärker (2) verstärkt und dann von der Sendeantenne (1) gesendet werden; und dass an einem ersten Empfangsende (32) ein von der ersten Empfangsantenne (15) empfangenes erstes Empfangssignal (30) zunächst den funften Leistungsteiler (16) durchläuft und in zwei Pfade unterteilt ist: ein Pfad das vierte Bandpassfilter (17) mit einer Mittenfrequenz von 1,67 GHz durchläuft, und der andere Pfaddurch das funfte Bandpassfilter (19) mit einer Mittenfrequenz von 2,06 GHz durchläuft, und dann das erste empfangene Signal (30) jeweils dureh den ersten rauscharmen Verstärker (18) und einen zweiten rauscharmen Verstärker (20) verstärkt und jeweils mit lokalen Oszillatorsignalen bei Frequenzen 1,67 GHz, 2,06 GHz gemischt wird, und wobei der erste Quadraturmischer (9) und der zweite Quadraturmischer (12) beide jeweils zwei Pfade vonorthogonalenersten Basisbandsignalen (34) und zweiten Basisbandsignalen (35) mittels Quadratur-Mischung erzeugen, und schließlich der erste Analog-Digital-Wandier (24) und der zweite Analog-Digital-Wandier (25) verwendet werden, um das erste Basisbandsignal (34) in ein digitales Signal umzuwandeln, und der dritte Analog-Digital-Wandier (26) und der vierte Analog-Digital-Wandler (27) verwendet werden, um das zweite Basisbandsignal (35) in ein digitales Signal umzuwandeln; und dass an einem zweiten Empfangsende (33) das von der zweiten Empfangsantenne (21) empfangene zweite Empfangssignal (31) zuerst das sechste Bandpassfilter (22) mit einer Mittenfrequenz von 2,06 GHz durchläuft und dann durch das dritte rauscharmen Verstârker (23) verstârkt und mit dem lokalen Oszillatorsignal mit einer Frequenz von 2,06 GHz gemischt wird, um zwei Pfade von orthogonalen dritten Basisbandsignalen (36) zu erzeugen, und schließlich der fünfte Analog-Digital-Wandler (28) und der sechste Analog-Digital-Wandler (29) verwendet werden, um das dritte Basisbandsignal (36) in ein digitales Signal umzuwandeln.2. Circuit structure with two frequencies and two receiving antennas, which can implement an inner life detection, according to Ansprueh 1, characterized in that at a transmitting end a frequency fj, which is generated by the first local oscillator (6), 1.67 GHz, and a frequency / 2 generated by the second local oscillator (7) is 2.06 GHz, the synthesized two frequency signals synthesized using the first power divider (3), amplified by the power amplifier (2), and then transmitted from the transmitting antenna (1) to be sent; and that at a first receiving end (32), a first receiving signal (30) received by the first receiving antenna (15) first passes through the fifth power divider (16) and is divided into two paths: a path the fourth bandpass filter (17) having a center frequency of 1.67 GHz, and the other path passes through the fifth band pass filter (19) with a center frequency of 2.06 GHz, and then the first received signal (30) through the first low-noise amplifier (18) and a second low-noise amplifier (30). 20) and respectively mixed with local oscillator signals at 1.67 GHz, 2.06 GHz frequencies, and wherein the first quadrature mixer (9) and the second quadrature mixer (12) each comprise two paths of orthogonal first baseband signals (34) and second baseband signals (FIG. 35) by means of quadrature mixing, and finally the first analog-to-digital Wandier (24) and the second analog-to-digital Wandier (25) are used to him the first baseband signal (34) is converted to a digital signal, and the third analog to digital converter (26) and the fourth analog to digital converter (27) are used to convert the second baseband signal (35) to a digital signal; and that at a second receiving end (33), the second receiving signal (31) received by the second receiving antenna (21) first passes through the sixth bandpass filter (22) at a center frequency of 2.06 GHz and then amplified by the third low noise amplifier (23) and mixed with the local oscillator signal at a frequency of 2.06 GHz to produce two paths of orthogonal third baseband signals (36), and finally the fifth analog-to-digital converter (28) and the sixth analog-to-digital converter ( 29) can be used to convert the third baseband signal (36) into a digital signal.
LU101015A 2018-09-19 2018-11-23 A double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection LU101015B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811094566.XA CN109188371A (en) 2018-09-19 2018-09-19 A kind of double frequency double reception antenna circuit structure of achievable indoor life detection

Publications (1)

Publication Number Publication Date
LU101015B1 true LU101015B1 (en) 2019-06-28

Family

ID=64908575

Family Applications (1)

Application Number Title Priority Date Filing Date
LU101015A LU101015B1 (en) 2018-09-19 2018-11-23 A double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection

Country Status (2)

Country Link
CN (1) CN109188371A (en)
LU (1) LU101015B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513748A (en) * 1983-08-30 1985-04-30 Rca Corporation Dual frequency heart rate monitor utilizing doppler radar
KR100888010B1 (en) * 2007-02-02 2009-03-09 한국과학기술원 Radar sensor for remote vital signal detection using two frequency
US20160022145A1 (en) * 2013-03-15 2016-01-28 Kirill Mostov Apparatus and methods for remote monitoring of physiological parameters
CN107358776A (en) * 2017-08-23 2017-11-17 苏州豪米波技术有限公司 Heartbeat detection radar system

Also Published As

Publication number Publication date
CN109188371A (en) 2019-01-11

Similar Documents

Publication Publication Date Title
US11051703B2 (en) Method and device for detecting a vital sign carrying signal using a phase-locked loop
LU101016B1 (en) A double -frequency circuit structure for implementing vital sign detection and short-distance positioning
US20180224526A1 (en) Quadrature self-injection-locked radar
TWI743570B (en) Multi-target vital sign detector and detection method thereof
EP3184040A1 (en) A method for detecting at least one of a heart rate and a respiratory rate of a subject
Mostafanezhad et al. Benefits of coherent low-IF for vital signs monitoring using Doppler radar
Juan et al. Frequency-offset self-injection-locked radar with digital frequency demodulation for SNR improvement, elimination of EMI issue, and DC offset calibration
TWI682649B (en) Signal demodulation device with iq mixer and demodulated method thereof
Wang et al. Seeing through walls with a self-injection-locked radar to detect hidden people
LU101015B1 (en) A double-frequency double-receiving antenna circuit structure capable of implementing indoor life detection
Su et al. Single conversion stepped-frequency continuous-wave radar using self-injection-locking technology
LU101011B1 (en) A circuit structure using radio frequency switch to simplify double-sideband doppler radar
LU101012B1 (en) A novel doppler radar circuit structure for suppressing DC bias
LU101014B1 (en) A double sideband doppler radar structure with phase shifter added at output of local oscillator
US2583573A (en) Radio receiving system
LU101013B1 (en) A double frequency continuous wave doppler radar circuit structure for suppressing DC bias
CN104467904A (en) Millimeter wave receiving and transmitting front end based on receiving and transmitting double-source local oscillators
US4647874A (en) Doppler signal processing circuitry
US4158202A (en) Receiver bandwidth conservation in a Doppler radar
US20200260974A1 (en) Heartbeat measurement device
JP3260717B2 (en) Motion detection device
RU2519952C2 (en) Radar altimeter with frequency-modulated sounding signal
US2755463A (en) Demodulating system
Myoung et al. A novel 10 GHz super-heterodyne bio-radar system based on a frequency multiplier and phase-locked loop
JPH0219435B2 (en)

Legal Events

Date Code Title Description
FG Patent granted

Effective date: 20190628