CN109212486A - A kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter - Google Patents

A kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter Download PDF

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Publication number
CN109212486A
CN109212486A CN201811094556.6A CN201811094556A CN109212486A CN 109212486 A CN109212486 A CN 109212486A CN 201811094556 A CN201811094556 A CN 201811094556A CN 109212486 A CN109212486 A CN 109212486A
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input terminal
way
voltage controlled
signal
phase shifter
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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 LU101014A priority patent/LU101014B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • 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
    • G01S7/28—Details of pulse systems
    • G01S7/285—Receivers
    • G01S7/292—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
    • G01S7/35—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
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
    • 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
    • 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 invention discloses a kind of double-side band Doppler radar structures in local oscillator output end addition phase shifter, including receiving antenna and transmitting antenna, receiving antenna to be sequentially connected in series low-noise amplifier, No. two receiver mixers and No.1 receiver mixer；Transmitting antenna is connected with transmitter mixer, No. two power splitters are connected between transmitter mixer input terminal and No. two receiver mixer input terminals, No.1 power splitter and phase shifter are connected between transmitter mixer input terminal and No.1 receiver mixer input terminal, No. two power splitter input terminals are connected with No. two voltage controlled oscillators, and No.1 power splitter input terminal is connected with No.1 voltage controlled oscillator.The present invention no longer needs to the frequency for adjusting local oscillator, to reduce the complexity and cost of implementation of double-side band Doppler radar when the distance between radar and measured object change.

Description

A kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter
Technical field
The present invention relates to Doppler radar field, more specifically, it relates to one kind to add phase shifter in local oscillator output end Double-side band Doppler radar structure.
Background technique
Microwave Doppler radar has also been employed that common application direction includes volume change for many years as wireless sensor Detect the cardiopulmonary monitoring [3] of [1], Post disaster relief [2] and sleep apnea syndrome.Compared to traditional contact-sensing Device, microwave Doppler radar will not influence the physiological activity of measured object without directly contacting measured object, will not be to tested Object causes uncomfortable feeling, this has greatly expanded the application space of microwave Doppler radar.Since Lin in 1975 et al. first The secondary physiological movement (including breathing and heartbeat) attempted using microwave Doppler radar detection human body, microwave Doppler radar conduct A kind of contactless life sign monitor system has attracted very more attentions [4].
By the research of decades, the vital signs detecting based on continuous wave Doppler radar has numerous scientific achievements. It is found in initial research, using the receiver structure of single channel frequency mixer, there are Zeroes, this can seriously reduce radar Measurement accuracy [5].For Zeroes, successively it has been proposed that the receiver structure [6] of orthogonal mixing and based on emit it is bilateral The frequency regulation technology [7] of band.Compared with orthogonal mixing demodulation structure, the frequency regulation technology based on double-side band is without generating just The local oscillation signal of friendship, without image-reject filter and intermediate-frequency filter [8], this can reduce the complexity of Doppler radar structure Degree and cost of implementation.But double-side band Doppler radar structure still remains disadvantage, i.e., when the distance between radar and measured object When changing, need to adjust the frequency of intermediate frequency local oscillator, and the frequency for adjusting the local oscillator is more complicated in hardware realization, cost It is higher.
Based on deficiency in the prior art, it is necessary to a kind of follow-on double-side band Doppler radar structure is proposed, with solution Certainly the shortcomings that existing double-side band radar arrangement.
[bibliography]
[1]Lin J C.Microwave sensing of physiological movement and volume change:a review.[J].Bioelectromagnetics,1992,13(6):557-565.
[2]Chen K M,Huang Y,Zhang J,et al.Microwave life-detection systems for searching human subjects under earthquake rubble or behind barrier[J] .Biomedical Engineering IEEE Transactions on,2000,47(1):105-114.
[3]Droitcour A,Lubecke V,Lin J,et al.A microwave radio for Doppler radar sensing of vital signs[C].Microwave Symposium Digest,2001 IEEE MTT-S International.IEEE,2001:175-178vol.1.
[4]Xiao Y,Lin J,Boric-Lubecke O,et al.A Ka-Band Low Power Doppler Radar System for Remote Detection of Cardiopulmonary Motion[J].2005,7:7151- 7154.
[5]Droitcour A D,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 Sym-posium Digest,2003IEEE MTT-S International.IEEE,2003:1945- 1948vol.3.
[6]Droitcour A D,Boric-Lubecke O,Lubecke V M,et al.Range correlation and I/Q per-formance benefits in single-chip silicon Doppler radars for noncontact cardiopulmo-nary monitoring[J].Microwave Theory&Techniques IEEE Transactions on,2004,52(3):838-848.
[7]Li C,Lin J,Xiao Y.Robust Overnight Monitoring of Human Vital Sign by a Non-contact Respiration and Heartbeat Detector[J].2006,1:2235-2238.
[8]Xiao Y,Lin J,Boric-Lubecke O,et al.Frequency-tuning technique for remote detec-tion 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.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of in local oscillator output end addition phase shifter Double-side band Doppler radar structure, when the distance between radar and measured object change, no longer need to adjust local oscillator frequency Rate, to reduce the complexity and cost of implementation of double-side band Doppler radar.
The purpose of the present invention is what is be achieved through the following technical solutions.
Double-side band Doppler radar structure in local oscillator output end addition phase shifter of the invention, including receiving antenna and hair Antenna is penetrated, the receiving antenna has been sequentially connected in series low-noise amplifier, No. two receiver mixers and No.1 receiver mixer； The transmitting antenna is connected with transmitter mixer, the transmitter mixer input terminal and No. two receiver mixer input terminals Between be connected with No. two power splitters, be connected between the transmitter mixer input terminal and No.1 receiver mixer input terminal No.1 power splitter and phase shifter, No. two power splitter input terminals are connected with No. two voltage controlled oscillators, and the No.1 power splitter is defeated Enter end and is connected with No.1 voltage controlled oscillator.
The No.1 power splitter output end is divided into two-way, wherein shifted device connection No.1 receiver mixer input all the way End, another way connect transmitter mixer input terminal；No. two power splitter output ends are divided into two-way, wherein connecting No. two all the way Receiver mixer input terminal, another way connect transmitter mixer input terminal.
Generating frequency using No.1 voltage controlled oscillator is f1Radiofrequency signal L1(t), which is divided by No.1 power splitter Two-way is used as transmitting signal all the way, is in addition used as local oscillation signal after phase shifter all the way；No. two voltage controlled oscillators are utilized later Generation frequency is f2Radiofrequency signal L2(t), which is divided into two-way by No. two power splitters, is used as local oscillation signal all the way, in addition It is used as transmitting signal all the way, the transmitting signal which generates with No.1 voltage controlled oscillator carries out in transmitter mixer Mixing；Signal after mixing is launched by transmitting antenna；In receiving end, antenna receives the signal modulated by body Afterwards, low-noise amplifier amplification, the local oscillation signal L then generated with No. two voltage controlled oscillators are first passed through2(t) in No. two receivers It is mixed in frequency mixer, the local oscillation signal L finally generated with No.1 voltage controlled oscillator1(t) in No.1 receiver mixer It is mixed, obtains 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 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 change the phase shift value of phase shifter, this is more simpler than the frequency operation for adjusting local oscillator.
(2) present invention no longer needs to change the frequency values of local oscillator, simplifies the design of local oscillator, reduces whole radar arrangement Complexity, also make the cost of implementation of radar lower.
Detailed description of the invention
Fig. 1 is double-side band Doppler radar structure principle chart of the present invention in local oscillator output end addition phase shifter.
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.
Double-side band Doppler radar structure in local oscillator output end addition phase shifter of the invention, as shown in Figure 1, including connecing It receives antenna and transmitting antenna, the receiving antenna has been sequentially connected in series low-noise amplifier, No. two receiver mixers and No.1 and has connect Receipts machine frequency mixer.The transmitting antenna is connected with transmitter mixer, the transmitter mixer input terminal and No. two receivers No. two power splitters, the transmitter mixer input terminal and No. two receiver mixer inputs are connected between mixer input No.1 power splitter and phase shifter are connected between end, No. two power splitter input terminals are connected with No. two voltage controlled oscillators, described No.1 power splitter input terminal is connected with No.1 voltage controlled oscillator.
Specifically, No.1 power splitter output end is divided into two-way, wherein shifted device connects No.1 receiver mixer all the way Input terminal, another way connect transmitter mixer input terminal.No. two power splitter output ends are divided into two-way, wherein connecting No. two all the way Receiver mixer input terminal, another way connect transmitter mixer input terminal.
Generating frequency using No.1 voltage controlled oscillator is f1Radiofrequency signal L1(t), which is divided by No.1 power splitter Two-way is used as transmitting signal all the way, is in addition used as local oscillation signal after phase shifter all the way；No. two voltage controlled oscillators are utilized later Generation frequency is f2Radiofrequency signal L2(t), which is divided into two-way by No. two power splitters, is used as local oscillation signal all the way, in addition It is used as transmitting signal all the way, the transmitting signal which generates with No.1 voltage controlled oscillator carries out in transmitter mixer Mixing；Signal after mixing is launched by transmitting antenna.In receiving end, antenna receives the signal modulated by body Afterwards, low-noise amplifier amplification, the local oscillation signal L then generated with No. two voltage controlled oscillators are first passed through2(t) in No. two receivers It is mixed in frequency mixer, the local oscillation signal L finally generated with No.1 voltage controlled oscillator1(t) in No.1 receiver mixer It is mixed, the baseband signal needed.In order to minimize mixing after baseband signal residual phase noise, two local oscillators Chip (No.1 voltage controlled oscillator and No. two voltage controlled oscillators) is driven using same crystal oscillator.
If the local oscillation signal L that No.1 voltage controlled oscillator generates1(t) frequency is f1, as shown in formula (1):
L1(t)=cos (2 π f1t) (1)
Wherein, t is the time.
If the local oscillation signal L that No. two voltage controlled oscillators generate2(t) frequency is f2, as shown in formula (2):
L2(t)=cos (2 π f2t) (2)
In transmitter section, the local oscillation signal that two local oscillators generate is mixed, the frequency of obtained mixed frequency signal L (t) Respectively f2-f1And f2+f1, as shown in formula (3):
Enable fH=f2+f1, fL=f2-f1, λH=c/fH, λL=c/fL, wherein c is the spread speed of signal.In receiver part Point, after first time down coversion, receive signal R1(t) as shown in formula (4):
In formula (4), d0For the distance between radar and measured object, x (t) is the chest cavity movement of human body.To R1(t) it carries out Second of down coversion, due to being added to a phase shifter in the output end of first local oscillator, if phase shift value is φ, therefore for the second time The baseband signal B (t) of the output of down coversion is as shown in formula (5):
According to document [8], enableIt can obtain shown in analysis result such as formula (6) as follows:
When... when, (6)
Work as θH-θLEqual to formula (6) result when, measurement result is most accurate in the position of optimum point, i.e. measurement result.Work as θH-θL Value be not equal to formula (6) result when, can by adjust phase shifter phase shift value φ make Phase shift value φ operation compared to the frequency for adjusting local oscillator before, directly adjusting phase shifter is simpler, and cost is also lower.
Embodiment:
The model of specifically used component is described below in the present invention: No.1 voltage controlled oscillator and No. two voltage controlled oscillators are equal Using the LTC6948IUFD of Analog Devices company, the frequency f generated using No.1 voltage controlled oscillator1For 1.2GHz, benefit The frequency f generated with No. two voltage controlled oscillators2For 2.14GHz；No.1 power splitter and No. two power splitters are all made of Anaren company PD0409J7575S2HF；Low-noise amplifier uses the HMC374ETR of Analog Devices company；No.1 receiver is mixed Frequency device, No. two receiver mixers and transmitter mixer are all made of the LT5522EUF#PBF of Analog Devices company；It moves Phase device uses the HMC936A of Analog Devices company.
Although above in conjunction with attached drawing, invention has been described, the invention is not limited to above-mentioned, this field it is general Logical technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, goes back Many forms can be made, all of these belong to the protection of the present invention.

Claims (3)

1. a kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter, which is characterized in that including receiving day Line and transmitting antenna, the receiving antenna have been sequentially connected in series low-noise amplifier, No. two receiver mixers and No.1 receiver Frequency mixer；The transmitting antenna is connected with transmitter mixer, the transmitter mixer input terminal and No. two receiver mixing Be connected with No. two power splitters between device input terminal, the transmitter mixer input terminal and No.1 receiver mixer input terminal it Between be connected with No.1 power splitter and phase shifter, No. two power splitter input terminals are connected with No. two voltage controlled oscillators, the No.1 Power splitter input terminal is connected with No.1 voltage controlled oscillator.
2. the double-side band Doppler radar structure according to claim 1 in local oscillator output end addition phase shifter, feature It is, the No.1 power splitter output end is divided into two-way, wherein shifted device connects No.1 receiver mixer input terminal all the way, Another way connects transmitter mixer input terminal；No. two power splitter output ends are divided into two-way, connect wherein connecting No. two all the way Receipts machine mixer input, another way connect transmitter mixer input terminal.
3. the double-side band Doppler radar structure according to claim 1 in local oscillator output end addition phase shifter, feature It is, generating frequency using No.1 voltage controlled oscillator is f1Radiofrequency signal L1(t), which is divided into two by No.1 power splitter Road is used as transmitting signal all the way, is in addition used as local oscillation signal after phase shifter all the way；It is produced later using No. two voltage controlled oscillators Raw frequency is f2Radiofrequency signal L2(t), which is divided into two-way by No. two power splitters, is used as local oscillation signal all the way, and in addition one Road is used as transmitting signal, and the transmitting signal which generates with No.1 voltage controlled oscillator is mixed in transmitter mixer Frequently；Signal after mixing is launched by transmitting antenna；In receiving end, antenna is received after the signal of body modulation, First pass through low-noise amplifier amplification, the local oscillation signal L then generated with No. two voltage controlled oscillators2(t) mixed in No. two receivers It is mixed in frequency device, the local oscillation signal L finally generated with No.1 voltage controlled oscillator1(t) in No.1 receiver mixer into Row mixing, obtains baseband signal.
CN201811094556.6A 2018-09-19 2018-09-19 A kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter Pending CN109212486A (en)

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CN201811094556.6A CN109212486A (en) 2018-09-19 2018-09-19 A kind of double-side band Doppler radar structure in local oscillator output end addition phase shifter
LU101014A LU101014B1 (en) 2018-09-19 2018-11-23 A double sideband doppler radar structure with phase shifter added at output of local oscillator

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CN112688641A (en) * 2020-12-16 2021-04-20 中电科仪器仪表有限公司 Device and method for realizing quadrature frequency mixing based on frequency divider

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