LU101013B1 - A double frequency continuous wave doppler radar circuit structure for suppressing DC bias - Google Patents

A double frequency continuous wave doppler radar circuit structure for suppressing DC bias Download PDF

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Publication number
LU101013B1
LU101013B1 LU101013A LU101013A LU101013B1 LU 101013 B1 LU101013 B1 LU 101013B1 LU 101013 A LU101013 A LU 101013A LU 101013 A LU101013 A LU 101013A LU 101013 B1 LU101013 B1 LU 101013B1
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power divider
path
bandpass filter
input
analog
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LU101013A
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German (de)
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Jianguo Ma
Shaohua Zhou
Zikai Yang
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Univ Tianjin
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/34—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
    • G01S7/03—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
    • 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

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  • 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 continuous wave Doppler radar circuit structure suppressing DC bias, wherein a transmitting antenna (1) is connected in series with a power amplifier (2) and a first power divider (3), input of the first power divider (3) is divided into two paths: one path is connected with a second power divider (4), and the other path is connected with a third power divider (5); input of the second power divider (4) is connected with a first local oscillator (6), and one path of output is connected with the first power divider (3), and the other path is connected to a first mixer (9) via a first bandpass filter (8); input of the third power divider (5) is connected with a second local oscillator (7), and one path of output is connected with the first power divider (3), and the other path is connected to a second mixer (11) via a second bandpass filter (10); the receiving antenna (12) is connected with a fourth divider (13), output of the fourth power divider (13) is connected in series with a third bandpass filter (14), a first low noise amplifier (15), a first mixer (9), a fourth bandpass filter (16) and a first analog-digital converter (17) in turn, and the other path is connected in series with a fifth bandpass filter (18), a second low noise amplifier (19), a second mixer (11), a sixth bandpass filter (20) and a second analog-digital converter (21) in turn; the first analog-digital converter (17) and second analog-digital converter (21) are both connected with a field programmable gate array (22).

Description

A DOUBLE FREQUENCY CONTINUOUS WAVE DOPPLER RADAR CIRCUIT STRUCTURE FOR SUPPRESSING DC BIAS
Field of the Disclosure
The present invention relates to the field of double frequency Doppler radar circuits, and more specifically to a double frequency continuous wave Doppler radar circuit structure for suppressing DC bias.
Background of the Disclosure A continuous wave Doppler radar is a main radar structure for achieving vital sign detection. In many receiver structures of the continuous wave Doppler radar, a zero-intermediate frequency structure is a receiver structure which is used most frequently. This structure does not have a problem of mirror frequency interference and does not need a mirror suppress filter any more, and therefore simplifies the structure of the radar. However, a local oscillator frequency of the structure is equal to a frequency of a radio frequency signal, so there exists the problem of DC bias after mixing in the receiver. This seriously affects a precision of a signal demodulation result, and even limits the application of the structure in the high-precision field.
With respect to the DC bias problem in the zero-intermediate frequency receiver structure, some people propose a digital low-intermediate frequency receiver structure (see reference [1]), namely, input a local oscillator signal whose frequency is less different from a frequency of the transmitted signal into a mixer for mixing with the received signal, the low-intermediate frequency signal generated after the mixing is sampled by the analog-digital converter, and finally mixing is performed for a second time in a digital field to generate a baseband signal. In this structure, it is necessary to generate two signals with different frequencies, one is used as the transmitted signal, and the other is used as the local oscillator signal, which wastes the signal sources to a certain degree.
Based on the conventional digital low-intermediate frequency receiver structure, 1 it is necessary to propose a novel receiver structure to improve a utilization rate of the signal sources.
[References] [1] Wu Y, Li J. The design of digital radar receivers [J], IEEE Aerospace &Electronic Systems Magazine, 1998, 13(1):35-41.
Summary of the Disclosure
An object of the present invention is to overcome drawbacks in the prior art and provide a double frequency continuous wave Doppler radar circuit structure suppressing DC bias, which improves the utilization rate of the signal sources and allows signal sources of different frequencies to be used as both transmitted signals and local oscillator signals for each other so as to achieve the digital low-intermediate frequency receiver structure, and improves the precision of the vital sign detection.
Since signals of two frequencies are both used as transmitted signals, the signals of two frequencies may both detect vital sign signals.
An object of the present invention is achieved with the following technical solutions. A double frequency continuous wave Doppler radar circuit structure suppressing DC bias 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 divided into two paths: one path is connected with a second power divider, and the other path is connected with a third power divider; 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 the other path is connected to the input of a first mixer via a first bandpass filter; input of the third power divider is connected with a second local oscillator, and output 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 second mixer via a second bandpass filter.
The receiving antenna is connected with a fourth 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, a first mixer, a fourth bandpass filter and a first analog-digital converter in turn, and the other path is connected in series with a fifth bandpass filter, a second low noise amplifier, a second mixer, a sixth bandpass filter and a second analog-digital converter in turn; the first analog-digital converter and second analog-digital converter are both connected with a field programmable gate array.
At a transmitting end, frequencies generated by the first local oscillator and second local oscillator are 1.67GHzand 2.06GHz respectively, the signals with two frequencies respectively pass through the second power divider and third power divider and are divided into two paths: one path is used as a transmitted signal and the other path is used as a local oscillator signal in each case; the two transmitted signals is synthesized with the first power divider, amplified by the power amplifier and then transmitted out via the transmitting antenna.
At a receiving end, the received signal first passes through the fourth power divider and divided into two paths, then the received signal respectively passes through the third bandpass filter with a central frequency 2.06GHz and the fifth bandpass filter with a central frequency 1.67GHz, then, the two paths of received signals are amplified by the first low noise amplifier and second low noise amplifier respectively, and respectively mixed with the local oscillator signal with the central frequency 1.67GHz and local oscillator signal with the central frequency 2.06GHz; the low-intermediate frequency signal after the mixing first passes through the fourth bandpass filter and sixth bandpass filter respectively, then sampled and converted by the first analog-digital converter and second analog-digital converter respectively into a digital signal, then the low-intermediate frequency signal performs quadrature mixing for a second time in the field programmable gate array to finally obtain a baseband signal, which is uploaded to a computer.
As compared with the prior art, the technical solution of the present invention may bring about the following advantageous effects: (1) The present invention improves a utilization rate of the signal sources, and allows signal sources of different frequencies to be used as both transmitted signals and local oscillator signals for each other to achieve the digital low-intermediate frequency receiver structure; (2) In the present invention, since signals of two frequencies are both used as transmitted signals, the signals of two frequencies may both detect vital sign signals, and perform relevant processing for two detection results to further improve the precision of vital sign detection.
Brief Description of Drawings
Fig. 1 is a schematic diagram of a double frequency continuous wave Doppler radar circuit structure suppressing DC bias 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 continuous wave Doppler radar circuit structure suppressing DC bias according to the present invention, as shown in Fig. 1, comprises a transmitting antenna 1 and a receiving antenna 12. The transmitting antenna 1 is connected to output of a power amplifier 2, input of the power amplifier 2 is connected with output of a first power divider 3, input of the first power divider 3 is divided into two paths: one path is connected with a second power divider 4, and the other path is connected with a third power divider 5. Input of the second power divider 4 is connected with a first local oscillator 6, and output is divided into two paths: output A of one path is connected with input E of the first power divider 3, and output B of the other path is connected to the input of a first 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 into two paths: output C of one path is connected with input F of the first power divider 3, and output D of the other path is connected to input of a second mixer 11 via a second bandpass filter 10.
The receiving antenna 12 is connected with a fourth 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, a first mixer 9, a fourth bandpass filter 16 and a first analog-digital converter 17 in turn, and the other path is connected in series with a fifth bandpass filter 18, a second low noise amplifier 19, a second mixer 11, a sixth bandpass filter 20 and a second analog-digital converter 21 in turn. The first analog-digital converter 17 and second analog-digital converter 21 are both connected with a field programmable gate array 22. The function of the field programmable gate array 22 is equivalent to four bandpass filters and four mixers: a seventh bandpass filter 24, an eighth bandpass filter 25, a ninth bandpass filter 26, a tenth bandpass filter 27, a third mixer 28, a fourth mixer 29, a fifth mixer 30 and a sixth mixer 31 as shown in Fig. 1.
At the transmitting end, frequencies generated by the first local oscillator 6 and second local oscillator 7 are 1.67GHzand 2.06GHz respectively, the signals with two frequencies respectively pass through the second power divider 4 and third power divider 5 and are divided into two paths: one path is used as a transmitted signal and the other path is used as a local oscillator signal. To minimize residual phase noise of the baseband signal after the mixing, the same crystal oscillator is used to drive two local oscillator sources. The two transmitted signals are synthesized with the first power divider 3, amplified by the power amplifier 2 and then transmitted out via the transmitting antenna 1. At the receiving end, the received signal first passes through the fourth power divider 13 and divided into two paths, then the received signal respectively passes through the third bandpass filter 14 with a central frequency 2.06GHz and the fifth bandpass filter 18 with a central frequency 1.67GHz so that each receiving channel only contains a signal with one frequency. Then, the two paths 1 of received signals are amplified by the first low noise amplifier 15 and second low noise amplifier 19 respectively, and respectively mixed with the local oscillator signal with the central frequency 1.67GHz and local oscillator signal with the central frequency 2.06GHz. Upon mixing, the 1.67GHz received signal is mixed with the 2.06GHz local oscillator signal, and the 2.06GHz received signal is mixed with the 1.67GHz local oscillator signal. The low-intermediate frequency signal after the mixing first passes through the fourth bandpass filter 16 and sixth bandpass filter 20 respectively, then sampled and converted by the first analog-digital converter 17 and second analog-digital converter 21 respectively into a digital signal, then the low-intermediate frequency signal performs quadrature mixing for a second time in the field programmable gate array 22 to finally obtain a baseband signal, which is uploaded to the computer 23. 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):
In Equation (1), 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\(f) with the frequency ƒ and reflection signal R2(t) with the frequency f2 received by the receiving antenna 12 are respectively as shown by Equation (2) and (3): ¢2) (3)
In Equation (2) and (3), d0 is a distance between the radar and the detected object, x(t) is a person’s thoracic cavity motion,/, and Â2 respectively correspond to
wavelengths of frequencies f and /2, c is a propagation speed of the signal, and ^i(/-2<7(/c)and ^2(t-2<7(/c) are residual phases. Two paths of intermediate-frequency signals T?iFi(/)and R^t) obtained after the mixing of the reflection signal and local oscillator signal are respectively shown by Equation (4) and (5): (4) ¢5)
In Equation (4) and (5), ^F=/i-^is the intermediate-frequency signal after the mixing, and Aç^and A^2 are residual phases. The intermediate-frequency signals shown in Equation (4) and (5) become digital signals through the first analog-digital converter 17 and second analog-digital converter 21 respectively, and perform mixing for a second time in the digital domain to obtain baseband signals Bn(n)JBQi(n),Bj2(n), and jBg2(n)shown by the following Equation (6)-(9) respectively: (6) (7) (8) (9) A complex signal demodulation method is used to extract vital signal signals, and rebuilt complex signals Si(n)and S2(n) are respectively shown in Equation (10) and (11):
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 and fourth power divider 13 all employ PD0922J5050S2HF of Anaren, Inc; the 1.67GHz first bandpass filter 8 and fifth bandpass filter 18 both employ TQQ7303 of TriQuint, Inc; the 2.06GHz second bandpass filter 10 and third bandpass filter 14 both employ 856738 of TriQuint, Inc; the 390MHz fourth bandpass filter 16 and sixth bandpass filter 20 both employ B39391B5047Z810 of Qualcomm, Inc; the first low noise amplifier 15 and second low noise amplifier 19 both employ HMC618ALP3ET of Analog Devices, Inc.; the first mixer 9 and second mixer 11 both employ LT5575EUF of Analog Devices, Inc.; the first analog-digital converter 17 and second analog-digital converter 21 employ AD9625 of Analog Devices, Inc.; the field programmable gate array 22 employs 5CSXFC6D6F31C6N of Intel, 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. Zweifrequenz-Dauerstrich-Doppler-Radarschaltungsstruktur, die eine Gleichstromvorspannung unterdrückt, umfassend eine Empfangsantenne (12) und eine Sendeantenne (1), dadurch gekennzeichnet, daß die Sendeantenne (1) mit einem Leistungsverstärker (2) verbunden ist, dessen Eingang mit einem ersten Leistungsteiler (3) verbunden ist, wobei der Eingang des ersten Leistungsteilers (3) in zwei Pfade unterteilt ist: ein Pfad mit einem zweiten Leistungsteiler (4) verbunden ist, und der andere Pfad mit einem dritten Leistungsteiler (5) verbunden ist; der Eingang des zweiten Leistungsteilers (4) mit einem ersten lokalen Oszillator (6) verbunden ist, und dessen 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 ersten Mischers (9) über einen ersten Bandpassfilter (8) verbunden ist; der Eingang des dritten Leistungsteilers (5) mit einem zweiten lokalen Oszillator (7) verbunden ist und dessen 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 zweiten Mischers (11) über einen zweiten Bandpassfilter (10) verbunden ist; die Empfangsantenne (12) mit einem vierten Teiler (13) verbunden ist, wobei der Ausgang des vierten Leistungsteilers (13) in zwei Pfade unterteilt ist: ein Pfad mit einem dritten Bandpassfilter (14), einem ersten rauscharmen Verstärker (15), einem ersten Mischer (9), einem vierten Bandpassfilter (16) und einem ersten Analog-Digital-Wandler (17) hintereinander in Reihe geschaltet ist, und der andere Pfad mit einem fiinften Bandpassfilter (18), einem zweiten rauscharmen Verstärker (19), einem zweiten Mischer (11), einem sechsten Bandpassfilter (20) und einem zweiten Analog-Digital-Wandler (21) hintereinander in Reihe geschaltet ist; der erste Analog-Digital-Wandler (17) und der zweite Analog-Digital-Wandler (21) beide mit einem feldprogrammierbaren Gate-Array (22) verbunden sind.A dual-frequency continuous-wave Doppler radar circuit structure which suppresses a DC bias comprising a receiving antenna (12) and a transmitting antenna (1), characterized in that the transmitting antenna (1) is connected to a power amplifier (2) whose input is connected to a first power divider (3), wherein the input of the first power divider (3) is divided into two paths: one path is connected to a second power divider (4), and the other path is connected to a third power divider (5); the input of the second power divider (4) is connected to a first local oscillator (6) and whose output is divided into two paths: one path connected to the input of the first power divider (3) and the other path to the input of one first mixer (9) via a first bandpass filter (8) is connected; the input of the third power divider (5) is connected to a second local oscillator (7) and whose output is divided into two paths: one path connected to the input of the first power divider (3) and the other path to the input of a second mixer (11) is connected via a second bandpass filter (10); the receiving antenna (12) is connected to a fourth divider (13), the output of the fourth power divider (13) being divided into two paths: a path having a third bandpass filter (14), a first low noise amplifier (15), a first Mixer (9), a fourth bandpass filter (16) and a first analog-to-digital converter (17) in series, and the other path with a five bandpass filter (18), a second low-noise amplifier (19), a second Mixer (11), a sixth band-pass filter (20) and a second analog-to-digital converter (21) connected in series behind one another; the first analog to digital converter (17) and the second analog to digital converter (21) are both connected to a field programmable gate array (22). 2. Zweifrequenz-Dauerstrich-Doppler-Radarschaltungsstruktur, die eine Gleichstromvorspannung unterdrückt, nach Ansprueh 1, dadurch gekennzeichnet, dass an einem Übertragungsende Frequenzen, die von dem ersten lokalen Oszillator (6) und dem zweiten lokalen Oszillator (7) erzeugt werden, jeweils 1,67 GHz und 2,06 GHz sind, wobei die Signale mit zwei Frequenzen jeweils den zweiten Leistungsteiler (4) und den driften Leistungsteiler (5) durchlaufen und in zwei Pfade unterteilt werden: ein Pfad als Sendesignal verwendet ist, und der andere Pfad als ein lokales Oszillatorsignal verwendet ist; die beiden Sendesignale über den ersten Leistungsteiler (3) synthetisier, vom Leistungsverstärker (2) verstärkt und dann über die Sendeantenne (1) ausgesendet werden; dass an einem Empfangsende das empfangene Signal zuerst den vierten Leistungsteiler (13) durchläuft und in zwei Pfade unterteilt wird, und dann das empfangene Signal jeweils den driften Bandpassfilter (14) mit einer Mittenfrequenz von 2,06 GHz und den fünften Bandpassfilter ( 18) mit einer Mittenfrequenz von 1,67 GHz durchläuft, und dann die zwei Pfade der empfangenen Signale dureh den ersten rauscharmen Verstärker (15) und den zweiten rauscharmen Verstärker (19) verstärkt und jeweils mit dem lokalen Oszillatorsignal mit der Mittenfrequenz von 1.67GHz und mit dem lokalen Oszillatorsignal mit der Mittenfrequenz von 2.06GHz gemischt werden; das Mittel- und Niederfrequenzsignal, das nach dem Mischen erhalten wird, zuerst das vierte Bandpassfilter (16) und das sechste Bandpassfilter (20) durchläuft, und dann dureh den ersten Analog-Digital-Wandler (17) und zweiten Analog-Digital-Wandler (21) abgetastet und jeweils in ein digitales Signal umgewandelt wird, und dann das Mittel- und Niederfrequenzsignal ein Quadraturmischen fur ein zweites Mai in dem feldprogrammierbaren Gate-Array (22) durchführt, um schließlich ein Basisbandsignal zu erhalten, das zu einem Computer (23) hochgeladen wird.2. A two-frequency continuous-wave Doppler radar circuit structure suppressing a DC bias according to claim 1, characterized in that at a transmission end frequencies generated by the first local oscillator (6) and the second local oscillator (7) are each 1 , 67 GHz and 2.06 GHz, where the two-frequency signals respectively pass through the second power divider (4) and the drift power divider (5) and are divided into two paths: one path used as the transmission signal and the other path as a local oscillator signal is used; the two transmission signals are synthesized via the first power divider (3), amplified by the power amplifier (2) and then transmitted via the transmitting antenna (1); that at a receiving end, the received signal first passes through the fourth power divider (13) and is divided into two paths, and then the received signal with the drift bandpass filter (14) with a center frequency of 2.06 GHz and the fifth bandpass filter (18) passes through a center frequency of 1.67 GHz, and then amplifies the two paths of the received signals through the first low-noise amplifier (15) and the second low-noise amplifier (19) and respectively with the local oscillator signal with the center frequency of 1.67 GHz and with the local Oscillator signal mixed with the center frequency of 2.06GHz; the mid- and low-frequency signal obtained after mixing passes first through the fourth band-pass filter (16) and the sixth band-pass filter (20), and then through the first analog-to-digital converter (17) and second analog-to-digital converter ( 21) and each converted into a digital signal, and then the mid and low frequency signals perform a quadrature mixing for a second may in the field programmable gate array (22) to finally obtain a baseband signal to be sent to a computer (23). is uploaded.
LU101013A 2018-09-19 2018-11-23 A double frequency continuous wave doppler radar circuit structure for suppressing DC bias LU101013B1 (en)

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