CN105116379B - The conditioning circuit of Doppler signal under strong noise background - Google Patents
The conditioning circuit of Doppler signal under strong noise background Download PDFInfo
- Publication number
- CN105116379B CN105116379B CN201510459950.5A CN201510459950A CN105116379B CN 105116379 B CN105116379 B CN 105116379B CN 201510459950 A CN201510459950 A CN 201510459950A CN 105116379 B CN105116379 B CN 105116379B
- Authority
- CN
- China
- Prior art keywords
- feet
- operational amplifier
- signal
- resistance
- capacitor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 34
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 27
- 230000003321 amplification Effects 0.000 claims abstract description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000011897 real-time detection Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 98
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000003137 locomotive effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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
-
- 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
- G01S7/40—Means for monitoring or calibrating
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of conditioning circuits of Doppler signal under strong noise background, it include pre-amplifier unit, real-time fault detection unit, signal filter unit, wherein signal filter unit includes the filtering conditioning circuit under double antenna operating mode and the adaptive-filtering conditioning circuit under single antenna operating mode.The faint Doppler signal of radar antenna output first passes around pre-amplifier unit, while the working condition of real-time detection radar antenna, and filtering conditioning is further done after signal amplification, is re-fed into rear class and makees sampling and calculation process.Conditioning circuit of the invention can extract faint Doppler signal from strong noise background, obtain the useful signal of high s/n ratio, reduce the error of rear class signal processing significantly, improve rate accuracy.
Description
Technical field
The present invention relates to radar velocity measurement sensor fields, more particularly, it relates to more under a kind of strong noise background
The general conditioning circuit for strangling signal.
Background technique
Traditional speed-measuring method is mainly used due to lacking system research and tackling problems in key technologies, China's locomotive velocity measuring system,
High-performance locomotive velocity measuring instrument is monopolized by advanced countries such as American-European and Japan for a long time, instrument price valuableness, device maintenance, technology clothes
Business, which lacks, to be guaranteed, industrial application cost is very high.Radar velocity measurement instrument is during locomotive driving, due to vibration, environmental change etc.
Factor influences, and the interference by various noises is extracted the useful signal of high s/n ratio by Doppler signal from very noisy, for
The signal processing of rear class is vital.
Summary of the invention
Object of the present invention is in the environment of very noisy interferes, provide a kind of conditioning for obtaining high s/n ratio Doppler signal
Circuit is real-time, high-precision, the prerequisite of high stability tachometric survey.
The technical solution adopted by the present invention to solve the technical problems is:
The conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that: include pre-amplifier unit, reality
When fault detection unit, signal filter unit, wherein signal filter unit include under double antenna operating mode filtering conditioning electricity
Adaptive-filtering conditioning circuit under road and single antenna operating mode, radar antenna respectively with pre-amplifier unit, real time fail
The signal input part of detection unit connects, and the signal output end of pre-amplifier unit and the signal input part of signal filter unit connect
It connects, the signal input part connection of signal filter unit, the signal output end of real-time fault detection unit and signal processing unit, letter
The signal output end connection communication and external interface of number processing unit；The faint Doppler signal of radar antenna output first passes around
Pre-amplifier unit, while the working condition of real-time detection radar antenna further do filtering conditioning, are re-fed into after signal amplification
Rear class makees sampling and calculation process.
The conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that the preposition amplification list
The circuit of member are as follows: Doppler's I signal connects capacitor C1,1 foot and operational amplifier of another termination instrument amplifier U2 of capacitor C1
10 feet of U1C, while pull down resistor R13 is met, 8,9 feet of operational amplifier U1C, which are connected, does voltage follower, operational amplifier
6 feet of another termination operational amplifier U1B of 8 foot the connecting resistance R5, resistance R5 of U1C, 6 feet of operational amplifier U1B are by electricity
7 feet that resistance R6 meets operational amplifier U1B do reversed ratio, while 7 feet of operational amplifier U1B connect the 16 of instrument amplifier U2
Foot；Doppler's Q signal connects capacitor C2,2,15 feet of another termination instrument amplifier U2 of capacitor C2, while connecing pull down resistor
R19；The indirect resistance R14 of 3,4 feet of instrument amplifier U2；5,12 feet of instrument amplifier U2 are grounded；Instrument amplifier U2's
6,7 feet connect the amplification output of the road Doppler signal A, are further processed to signal filter unit；8 feet of instrument amplifier U2 connect-
5V power supply, while meeting filter capacitor C7, C11；9 feet of instrument amplifier U2 connect+5V power supply, while meeting filter capacitor C8, C12；
10,11 feet of instrument amplifier U2 connect the amplification output of the road Doppler signal B, are further processed to signal filter unit；Instrument
The indirect resistance R15 of 13,14 feet of amplifier U2.
The conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that the real time fail inspection
Survey the circuit of unit are as follows: another termination filter capacitor C15 of Doppler's I signal connecting resistance R7, resistance R7, while connecing operation amplifier
2 feet of device U1A；3 feet of operational amplifier U1A are connected with 12 feet of operational amplifier U1D, and meet divider resistance R16 to ground, together
When meet divider resistance R9 to -5V；4 feet of operational amplifier U1A connect+5V power supply, while meeting filter capacitor C3, C9；Operation amplifier
11 feet of device U1A connect -5V power supply, while meeting filter capacitor C4, C10；1 foot of operational amplifier U1A meets divider resistance R17, electricity
Resistance R17 meets divider resistance R11, while connecing the base stage of triode Q1；Doppler Q signal connecting resistance R10, the other end of resistance R10
Filter capacitor C16 is met, while connecing 12 feet of operational amplifier U1D；14 feet of operational amplifier U1D meet divider resistance R18, partial pressure
Resistance R18 meets divider resistance R12, while connecing the base stage of triode Q2；The emitter of triode Q2 is grounded, the current collection of triode Q2
Pole connects the emitter of triode Q1, and the collector of triode Q1 connects pull-up resistor R8 to+5V, while connecing and being output to signal processing list
Member.
The conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that the double antenna work
Filtering conditioning circuit under mode are as follows: DOP-_OUT output meets capacitor C96, and the capacitor C96 other end is connected to operation by resistance R9
2 feet of amplifier U7A, the 3 feet ground connection of operational amplifier U7A, 2 feet of operational amplifier U7A pass through resistance R12 and capacitor C112
It is connected to 1 foot of operational amplifier U7A；4 feet of operational amplifier U7A connect+5V power supply, while meeting filter capacitor C10, C76；Operation
11 feet of amplifier U7A connect -5V power supply, while meeting filter capacitor C11, C77；The 1 foot connecting resistance R58 of operational amplifier U7A, electricity
Another terminating resistor R60 of R58 is hindered, while connecing 6 feet of capacitor C121 to operational amplifier U7B；Another termination of resistance R60 is filtered
Wave capacitor C122, while connecing 5 feet of operational amplifier U7B；6,7 feet of operational amplifier U7B are connected, and synchronous signal is output to letter
Number processing unit is sampled for AD；DOP+_OUT output meets capacitor C95, another terminating resistor R10 of capacitor C95, resistance R10's
6 feet of another termination operational amplifier U10B, while connecting resistance R11 and capacitor C111；5 feet of operational amplifier U10B are grounded；
The 7 foot connecting resistance R11 and capacitor C111 of operational amplifier U10B, while connecting resistance R3；The 3 foot connecting resistances of operational amplifier U10A
The other end of R3, while connecing the 1 of potentiometer VR1,2 feet, the 3 feet ground connection of potentiometer VR1；2 feet of operational amplifier U10A connect electricity
Hinder R17 to, while 1 foot of connecting resistance R18 to operational amplifier U10A；4 feet of operational amplifier U10A connect -5V power supply, together
When meet filter capacitor C13, C79；8 feet of operational amplifier U10A connect+5V power supply, while meeting filter capacitor C12, C78；Operation is put
Another terminating resistor R63 of 1 foot the connecting resistance R61, resistance R61 of big device U10A, while capacitor C123 is met to operational amplifier
2 feet of U11A；Another termination filter capacitor C124 of resistance R63, while connecing 3 feet of operational amplifier U11A；Operational amplifier
4 feet of U11A connect -5V power supply, while meeting filter capacitor C16, C81；8 feet of operational amplifier U11A connect+5V power supply, connect simultaneously
Filter capacitor C15, C80；1,2 feet of operational amplifier U11A are connected, and synchronous signal is output to signal processing unit and adopts for AD
Sample.
The conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that the single antenna work
Adaptive-filtering conditioning circuit under mode are as follows: another termination of 1 foot the connecting resistance R93, resistance R93 of operational amplifier U10A is transported
5 feet of amplifier U8B are calculated, 6,7 feet of operational amplifier U8B, which are connected, is followed by 2 feet of low-pass Bessel filter U13；Bei Sai
3,5, the 11 feet ground connection of your low-pass filter U13；4 feet of low-pass Bessel filter U13 connect+5V power supply by resistance R80, together
When+5V meet diode D3 and capacitor C27；14 feet of low-pass Bessel filter U13 connect -5V power supply by resistance R77, simultaneously -
5V meets diode D1 and capacitor C14；8,16 feet of low-pass Bessel filter U13 are connected；The 12 of low-pass Bessel filter U13
Foot meets the CLK of signal processing unit；The 9 foot connecting resistance R70 of low-pass Bessel filter U13, the other end of resistance R70 pass through electricity
Hold 2 feet that C129 meets operational amplifier U8A, while connecting resistance R71；Another termination filter capacitor C130 of resistance R71, connects simultaneously
3 feet of operational amplifier U8A；4 feet of operational amplifier U8A connect+5V power supply, while meeting filter capacitor C7, C86；Operation amplifier
8 feet of device U8A connect -5V power supply, while meeting filter capacitor C28, C87；1,2 feet of operational amplifier U8A are connected, and synchronous signal is defeated
Signal processing unit is arrived out to sample for AD.
The present invention compared with prior art the utility model has the advantages that
1) it is mentioned in the preposition amplification of Doppler signal using high input impedance, the instrument amplifier of high cmrr
The quality of Doppler signal under high strong noise background；
2) quadrature channel technology is used, it can be achieved that the direction of motion is sentenced while improving tachometric survey precision
Not；
3) real-time fault detection technology, according to the working condition of radar antenna, adaptively selected suitable Working mould are used
Formula；
4) under double antenna operating mode, front end filters out low-frequency disturbance with single order reverse phase high-pass filter, and rear end second order is low
Logical Butterworth filter, effectively filters out High-frequency Interference, and play the role of anti-aliasing；Pass through variable gain low-noise amplifier
So that two-way Doppler signal amplitude size matches, influence of the signal amplitude to signal measurement precision is reduced；
5) under single antenna operating mode, using the multistage low-pass Bessel filter of low pass, the adaptive of signal frequency is realized
It should handle, greatly improve the quality of signal, promote the precision of tachometric survey.
Detailed description of the invention:
Fig. 1 is the structural block diagram of the conditioning circuit of Doppler signal under strong noise background.
Fig. 2 is the circuit diagram of preposition amplification in the present invention.
Fig. 3 is the circuit diagram of real-time fault detection in the present invention.
Fig. 4-1 is the circuit theory that signal filters under double antenna operating mode when DOP-_OUT signal accesses in the present invention
Figure.
Fig. 4-2 is the circuit theory that signal filters under double antenna operating mode when DOP+_OUT signal accesses in the present invention
Figure.
Fig. 5 is the circuit diagram that self-adapting signal filters under single antenna operating mode in the present invention.
Specific embodiment:
As shown in Figure 1, under strong noise background Doppler signal conditioning circuit, include pre-amplifier unit 2, in real time therefore
Hinder detection unit 3, signal filter unit 4, wherein signal filter unit 4 includes the filtering conditioning circuit under double antenna operating mode
With the adaptive-filtering conditioning circuit under single antenna operating mode, radar antenna 1 respectively with pre-amplifier unit 2, real time fail
The signal input part of detection unit 3 connects, and the signal output end of pre-amplifier unit 2 and the signal of signal filter unit 4 input
End connection, the signal input part of signal filter unit 4, the signal output end of real-time fault detection unit 3 and signal processing unit 5
Connection, the signal output end connection communication and external interface 6 of signal processing unit 5；The faint Doppler letter that radar antenna 1 exports
Pre-amplifier unit 2, while the working condition of real-time detection radar antenna number are first passed around, is further filtered after signal amplification
Conditioning is re-fed into rear class and makees sampling and calculation process.
Initial I, Q two-way Doppler signal is the sinusoidal signal that direct current biasing is -1V or so, sinusoidal signal amplitude
Usually only several mV, the interference vulnerable to outside noise.To meet rear class to the accuracy requirement of signal and sentencing for the direction of motion
It is disconnected, the carry out differential amplification of high input impedance, high cmrr has been selected, the Doppler signal of two-way high s/n ratio is exported；
Meanwhile the amplitude of I, Q two paths of signals depends primarily on DC offset voltage, therefore two-way voltage comparator circuit is used, pass through output
Level judge whether Antenna Operation normal.The two-way Doppler signal of preposition amplification output is further filtered, point
For double antenna operating mode and single antenna operating mode, wherein single antenna mode is to wherein Doppler signal is done adaptively all the way
Filtering, the frequency filtering of low-pass Bessel filter is adjusted according to actual speed, so that the speed promoted under single antenna mode is surveyed
Accuracy of measurement.
As shown in Fig. 2, the circuit of pre-amplifier unit are as follows: Doppler's I signal connects capacitor C1, another termination instrument of capacitor C1
1 foot of table amplifier U2 and 10 feet of operational amplifier U1C, while pull down resistor R13 is met, 8, the 9 foot phases of operational amplifier U1C
Connect and makees voltage follower, 6 feet of another termination operational amplifier U1B of 8 foot the connecting resistance R5, resistance R5 of operational amplifier U1C,
6 feet of operational amplifier U1B are reversed ratio, while operational amplifier U1B by 7 feet that resistance R6 meets operational amplifier U1B
7 feet connect 16 feet of instrument amplifier U2；Doppler's Q signal meets capacitor C2, another termination instrument amplifier U2's of capacitor C2
2,15 foot, while meeting pull down resistor R19；The indirect resistance R14 of 3,4 feet of instrument amplifier U2；5, the 12 of instrument amplifier U2
Foot ground connection；6,7 feet of instrument amplifier U2 connect the amplification output of the road Doppler signal A, are further processed to signal filter unit；
8 feet of instrument amplifier U2 connect -5V power supply, while meeting filter capacitor C7, C11；9 feet of instrument amplifier U2 connect+5V power supply, together
When meet filter capacitor C8, C12；10,11 feet of instrument amplifier U2 connect the amplification output of the road Doppler signal B, single to signal filtering
Member is further processed；The indirect resistance R15 of 13,14 feet of instrument amplifier U2.
High-pass filtering is passed through to I, Q signal first, filters out the direct current biasing ingredient in signal, one side two paths of signals conduct
The Differential Input all the way of instrument amplifier U2 adjusts the gain size that R14 changes signal, obtains Doppler signal DOP+_ all the way
OUT output；Another aspect I signal amplifies through the reversed in proportion of low-noise operational amplifier U1, then the another way difference of U2 is done with Q signal
Input adjusts the gain size that R15 changes signal, obtains another way Doppler signal DOP-_OUT output, can be defeated according to two-way
The phase difference of signal judges the traffic direction of train out.
As shown in figure 3, the circuit of real-time fault detection unit are as follows: Doppler I signal connecting resistance R7, the other end of resistance R7
Filter capacitor C15 is met, while connecing 2 feet of operational amplifier U1A；3 feet of operational amplifier U1A and the 12 of operational amplifier U1D
Foot is connected, and meets divider resistance R16 to ground, while meeting divider resistance R9 to -5V；4 feet of operational amplifier U1A connect+5V power supply,
Filter capacitor C3, C9 are met simultaneously；11 feet of operational amplifier U1A connect -5V power supply, while meeting filter capacitor C4, C10；Operation is put
1 foot of big device U1A meets divider resistance R17, and resistance R17 meets divider resistance R11, while connecing the base stage of triode Q1；Doppler Q letter
Number connecting resistance R10, another termination filter capacitor C16 of resistance R10, while connecing 12 feet of operational amplifier U1D；Operational amplifier
14 feet of U1D meet divider resistance R18, and divider resistance R18 meets divider resistance R12, while connecing the base stage of triode Q2；Triode Q2
Emitter ground connection, the emitter of the collector connecting transistor Q1 of triode Q2, the collector of triode Q1 connects pull-up resistor R8
To+5V, while connecing and being output to signal processing unit.
Real-time fault detection circuit are as follows: the original signal of I, Q are the sinusoidal Doppler signal of -1V or so bias voltage, are had
The amplitude of effect signal only has several mV, by compared with the negative voltage of setting, showing I, Q lower than the voltage after RC filter circuit
Bias voltage it is correct, comparator export high level, when I, Q two paths of signals are all normal, triode Q1 and Q2 are simultaneously turned on, therefore
Barrier detection signal output is low level, and Antenna Operation is normal；Otherwise fault detection signal exports high level, and antenna breaks down.
As shown in figure 4, the filtering conditioning circuit under double antenna operating mode are as follows: DOP-_OUT output connects capacitor C96, capacitor
The C96 other end is connected to 2 feet of operational amplifier U7A, the 3 feet ground connection of operational amplifier U7A, operational amplifier by resistance R9
2 feet of U7A are connected to 1 foot of operational amplifier U7A by resistance R12 and capacitor C112；4 feet of operational amplifier U7A connect+5V electricity
Source, while meeting filter capacitor C10, C76；11 feet of operational amplifier U7A connect -5V power supply, while meeting filter capacitor C11, C77；
Another terminating resistor R60 of 1 foot the connecting resistance R58, resistance R58 of operational amplifier U7A, while capacitor C121 is met to operation amplifier
6 feet of device U7B；Another termination filter capacitor C122 of resistance R60, while connecing 5 feet of operational amplifier U7B；Operational amplifier
6,7 feet of U7B are connected, and synchronous signal is output to signal processing unit and samples for AD；DOP+_OUT output meets capacitor C95, electricity
Hold another terminating resistor R10 of C95,6 feet of another termination operational amplifier U10B of resistance R10, while connecting resistance R11 and electricity
Hold C111；5 feet of operational amplifier U10B are grounded；The 7 foot connecting resistance R11 and capacitor C111 of operational amplifier U10B, connect simultaneously
Resistance R3；The other end of the 3 foot connecting resistance R3 of operational amplifier U10A, while the 1 of potentiometer VR1,2 feet are connect, potentiometer VR1's
3 feet ground connection；The 2 foot connecting resistance R17 of operational amplifier U10A are to ground, while 1 foot of connecting resistance R18 to operational amplifier U10A；
4 feet of operational amplifier U10A connect -5V power supply, while meeting filter capacitor C13, C79；8 feet of operational amplifier U10A connect+5V electricity
Source, while meeting filter capacitor C12, C78；Another terminating resistor of 1 foot the connecting resistance R61, resistance R61 of operational amplifier U10A
R63, while connecing 2 feet of capacitor C123 to operational amplifier U11A；Another termination filter capacitor C124 of resistance R63, connects simultaneously
3 feet of operational amplifier U11A；4 feet of operational amplifier U11A connect -5V power supply, while meeting filter capacitor C16, C81；Operation is put
8 feet of big device U11A connect+5V power supply, while meeting filter capacitor C15, C80；1,2 feet of operational amplifier U11A are connected, and believe simultaneously
Signal processing unit number is output to sample for AD.
Filtering conditioning circuit under double antenna operating mode are as follows: Doppler signal is needed after preposition amplification into one
The filtering of step, wherein DOP-_OUT first passes around capacitor C96 and does single order high-pass filtering to inverting amplifier U7A, using low noise
Acoustic amplifier U7B does second-order low-pass filter, and signal is sent to signal processing unit and carries out AD sampling；DOP+_OUT is passed through first
It crosses capacitor C95 and does single order high-pass filtering to inverting amplifier U10B, realize the decaying of signal with same mutually amplification using partial pressure or put
It is big adjustable, by adjusting the resistance value of potentiometer, so that two-way Doppler signal amplitude size matches, using low-noise amplifier
Signal is sent to signal processing unit and carries out AD sampling by U11A second-order low-pass filter.
As shown in figure 5, the adaptive-filtering conditioning circuit under single antenna operating mode are as follows: 1 foot of operational amplifier U10A
5 feet of another termination operational amplifier U8B of connecting resistance R93, resistance R93,6,7 feet of operational amplifier U8B, which are connected, to be followed by
2 feet of low-pass Bessel filter U13；3,5,11 feet of low-pass Bessel filter U13 are grounded；Low-pass Bessel filter
4 feet of U13 connect+5V power supply by resistance R80, and+5V meets diode D3 and capacitor C27 simultaneously；Low-pass Bessel filter U13's
14 feet connect -5V power supply by resistance R77, and -5V meets diode D1 and capacitor C14 simultaneously；8, the 16 of low-pass Bessel filter U13
Foot is connected；12 feet of low-pass Bessel filter U13 meet the CLK of signal processing unit；9 feet of low-pass Bessel filter U13
The other end of connecting resistance R70, resistance R70 meet 2 feet of operational amplifier U8A, while connecting resistance R71 by capacitor C129；Resistance
Another termination filter capacitor C130 of R71, while connecing 3 feet of operational amplifier U8A；4 feet of operational amplifier U8A connect+5V electricity
Source, while meeting filter capacitor C7, C86；8 feet of operational amplifier U8A connect -5V power supply, while meeting filter capacitor C28, C87；Fortune
1,2 feet for calculating amplifier U8A are connected, and synchronous signal is output to signal processing unit and samples for AD.
Adaptive-filtering conditioning circuit under single antenna operating mode are as follows: DOP+_OUT signal is after amplitude matches, separately
One side connecting resistance R93, the input after voltage follower as low-pass Bessel filter U13, U13 use dual power supply ± 5V
Power supply, ± 5V capacitor and Schottky diode filter out the interference of noise, and 10 Ω resistance of connecting subtract to the power input of U13
Weak current influences caused by fluctuating.The CLK of the 12pin outer signal processing unit of U13 is controlled as frequency filtering and is inputted, according to
The difference of speed automatically selects suitable CLK frequency, to realize the adaptive-filtering of signal.
Claims (1)
1. the conditioning circuit of Doppler signal under a kind of strong noise background, it is characterised in that: include pre-amplifier unit, real-time
Fault detection unit, signal filter unit, wherein signal filter unit includes the filtering conditioning circuit under double antenna operating mode
With the adaptive-filtering conditioning circuit under single antenna operating mode, radar antenna is examined with pre-amplifier unit, real time fail respectively
The signal input part connection of unit is surveyed, the signal output end of pre-amplifier unit and the signal input part of signal filter unit connect
It connects, the signal input part connection of signal filter unit, the signal output end of real-time fault detection unit and signal processing unit, letter
The signal output end connection communication and external interface of number processing unit；The faint Doppler signal of radar antenna output first passes around
Pre-amplifier unit, while the working condition of real-time detection radar antenna further do filtering conditioning, are re-fed into after signal amplification
Rear class makees sampling and calculation process；
Under the double antenna operating mode, front end filters out low-frequency disturbance, rear end step low-pass with single order reverse phase high-pass filter
Butterworth filter filters out High-frequency Interference, and makes two-way Doppler signal amplitude by variable gain low-noise amplifier
Size matching；
Under the single antenna operating mode, using the multistage low-pass Bessel filter of low pass, the adaptive place of signal frequency is realized
Reason；
The circuit of the pre-amplifier unit are as follows: Doppler's I signal connects capacitor C1, another termination instrument amplifier of capacitor C1
1 foot of U2 and 10 feet of operational amplifier U1C, while pull down resistor R13 is met, 8,9 feet of operational amplifier U1C, which are connected, does voltage
Follower, 6 feet of another termination operational amplifier U1B of 8 foot the connecting resistance R5, resistance R5 of operational amplifier U1C, operation amplifier
6 feet of device U1B do reversed ratio by 7 feet that resistance R6 meets operational amplifier U1B, while 7 feet of operational amplifier U1B connect instrument
16 feet of table amplifier U2；Doppler's Q signal meets capacitor C2,2,15 feet of another termination instrument amplifier U2 of capacitor C2, together
When meet pull down resistor R19；The indirect resistance R14 of 3,4 feet of instrument amplifier U2；5,12 feet of instrument amplifier U2 are grounded；Instrument
6,7 feet of table amplifier U2 connect the amplification output of the road Doppler signal A, are further processed to signal filter unit；Instrument amplification
8 feet of device U2 connect -5V power supply, while meeting filter capacitor C7, C11；9 feet of instrument amplifier U2 connect+5V power supply, while connecing filtering
Capacitor C8, C12；10,11 feet of instrument amplifier U2 connect the amplification output of the road Doppler signal B, do to signal filter unit into one
Step processing；The indirect resistance R15 of 13,14 feet of instrument amplifier U2；
The circuit of the real-time fault detection unit are as follows: another termination filtered electrical of Doppler's I signal connecting resistance R7, resistance R7
Hold C15, while connecing 2 feet of operational amplifier U1A；3 feet of operational amplifier U1A are connected with 12 feet of operational amplifier U1D, and
Divider resistance R16 is met to ground, while meeting divider resistance R9 to -5V；4 feet of operational amplifier U1A connect+5V power supply, while connecing filter
Wave capacitor C3, C9；11 feet of operational amplifier U1A connect -5V power supply, while meeting filter capacitor C4, C10；Operational amplifier U1A's
1 foot meets divider resistance R17, and resistance R17 meets divider resistance R11, while connecing the base stage of triode Q1；Doppler's Q signal connecting resistance
Another termination filter capacitor C16 of R10, resistance R10, while connecing 12 feet of operational amplifier U1D；The 14 of operational amplifier U1D
Foot meets divider resistance R18, and divider resistance R18 meets divider resistance R12, while connecing the base stage of triode Q2；The transmitting of triode Q2
Pole ground connection, the emitter of the collector connecting transistor Q1 of triode Q2, the collector of triode Q1 connect pull-up resistor R8 to+5V,
It connects simultaneously and is output to signal processing unit；
Filtering conditioning circuit under the double antenna operating mode are as follows: DOP-_OUT output meets capacitor C96, and capacitor C96 is another
End is connected to 2 feet of operational amplifier U7A, the 3 feet ground connection of operational amplifier U7A, 2 feet of operational amplifier U7A by resistance R9
1 foot of operational amplifier U7A is connected to by resistance R12 and capacitor C112；4 feet of operational amplifier U7A connect+5V power supply, simultaneously
Meet filter capacitor C10, C76；11 feet of operational amplifier U7A connect -5V power supply, while meeting filter capacitor C11, C77；Operation amplifier
Another terminating resistor R60 of 1 foot the connecting resistance R58, resistance R58 of device U7A, while capacitor C121 is met to the 6 of operational amplifier U7B
Foot；Another termination filter capacitor C122 of resistance R60, while connecing 5 feet of operational amplifier U7B；6, the 7 of operational amplifier U7B
Foot is connected, and synchronous signal is output to signal processing unit and samples for AD；DOP+_OUT output meets capacitor C95, and capacitor C95's is another
6 feet of another termination operational amplifier U10B of one terminating resistor R10, resistance R10, while connecting resistance R11 and capacitor C111；Fortune
Calculate the 5 feet ground connection of amplifier U10B；The 7 foot connecting resistance R11 and capacitor C111 of operational amplifier U10B, while connecting resistance R3；Fortune
The other end of the 3 foot connecting resistance R3 of amplifier U10A is calculated, while connecing the 1 of potentiometer VR1,2 feet, the 3 feet ground connection of potentiometer VR1；
The 2 foot connecting resistance R17 of operational amplifier U10A are to ground, while 1 foot of connecting resistance R18 to operational amplifier U10A；Operation amplifier
4 feet of device U10A connect -5V power supply, while meeting filter capacitor C13, C79；8 feet of operational amplifier U10A connect+5V power supply, simultaneously
Meet filter capacitor C12, C78；Another terminating resistor R63 of 1 foot the connecting resistance R61, resistance R61 of operational amplifier U10A, simultaneously
Connect 2 feet of capacitor C123 to operational amplifier U11A；Another termination filter capacitor C124 of resistance R63, while connecing operation amplifier
3 feet of device U11A；4 feet of operational amplifier U11A connect -5V power supply, while meeting filter capacitor C16, C81；Operational amplifier U11A
8 feet connect+5V power supply, while meeting filter capacitor C15, C80；1,2 feet of operational amplifier U11A are connected, and synchronous signal is output to
Signal processing unit is sampled for AD；
Adaptive-filtering conditioning circuit under the single antenna operating mode are as follows: the 1 foot connecting resistance of operational amplifier U10A
5 feet of another termination operational amplifier U8B of R93, resistance R93,6,7 feet of operational amplifier U8B, which are connected, is followed by Bezier
2 feet of low-pass filter U13；3,5,11 feet of low-pass Bessel filter U13 are grounded；4 feet of low-pass Bessel filter U13
+ 5V power supply is connect by resistance R80 ,+5V meets diode D3 and capacitor C27 simultaneously；14 feet of low-pass Bessel filter U13 pass through
Resistance R77 connects -5V power supply, and -5V meets diode D1 and capacitor C14 simultaneously；8,16 feet of low-pass Bessel filter U13 are connected；
12 feet of low-pass Bessel filter U13 meet the CLK of signal processing unit；The 9 foot connecting resistances of low-pass Bessel filter U13
The other end of R70, resistance R70 meet 2 feet of operational amplifier U8A, while connecting resistance R71 by capacitor C129；Resistance R71's is another
One termination filter capacitor C130, while connecing 3 feet of operational amplifier U8A；4 feet of operational amplifier U8A connect+5V power supply, simultaneously
Meet filter capacitor C7, C86；8 feet of operational amplifier U8A connect -5V power supply, while meeting filter capacitor C28, C87；Operational amplifier
1,2 feet of U8A are connected, and synchronous signal is output to signal processing unit and samples for AD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459950.5A CN105116379B (en) | 2015-07-28 | 2015-07-28 | The conditioning circuit of Doppler signal under strong noise background |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459950.5A CN105116379B (en) | 2015-07-28 | 2015-07-28 | The conditioning circuit of Doppler signal under strong noise background |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105116379A CN105116379A (en) | 2015-12-02 |
| CN105116379B true CN105116379B (en) | 2019-03-22 |
Family
ID=54664412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510459950.5A Active CN105116379B (en) | 2015-07-28 | 2015-07-28 | The conditioning circuit of Doppler signal under strong noise background |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105116379B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547632B (en) * | 2015-12-09 | 2019-07-16 | 安徽省计量科学研究院 | A method of impact velocity is examined and determine or calibrated using impact velocity measuring device |
| CN107296599B (en) * | 2017-05-16 | 2024-01-26 | 武汉思创电子有限公司 | Multi-lead ECG signal conditioning and data acquisition circuit |
| CN107666300B (en) * | 2017-11-03 | 2023-08-29 | 国网江苏省电力公司电力科学研究院 | Signal filtering processing comparison system based on analog-to-digital converter |
| CN111464143A (en) * | 2020-04-03 | 2020-07-28 | 南京中岭艾恩环保科技有限公司 | Circuit for conditioning electric signals of electrostatic sensor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2246678A (en) * | 1990-07-30 | 1992-02-05 | Philips Electronic Associated | Cw radar system. |
| CN1204902A (en) * | 1997-06-27 | 1999-01-13 | 日本电气株式会社 | Transmitter/receiver having antenna failure detection system |
| CN202029843U (en) * | 2011-05-11 | 2011-11-09 | 北京星河易达科技有限公司 | Vehicle active anti-collision system based on microwave radar |
| CN205120957U (en) * | 2015-07-28 | 2016-03-30 | 安徽蓝盾光电子股份有限公司 | Modulate circuit of doppler signal under very noisy background |
-
2015
- 2015-07-28 CN CN201510459950.5A patent/CN105116379B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105116379A (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105116379B (en) | The conditioning circuit of Doppler signal under strong noise background | |
| CN103070686B (en) | Device and method for measuring human body breathing mechanics parameter on basis of double differential-pressure sensors | |
| CN104198031B (en) | A kind of Twist Vibration System of Engine Crankshaft signal detecting method and device | |
| CN109781195A (en) | A kind of electromagnetic flowmeter system and signal extraction method based on dual-frequency excitation | |
| CN103575360B (en) | Merogenesis capacitive liquid level sensor measuring circuit implementation method | |
| CN107478402A (en) | A kind of low-frequency vibration displacement detection system and method | |
| CN104459187A (en) | Device and method for measuring rotating speed of large rotating equipment | |
| CN106289121B (en) | A kind of computational methods of the equivalent pipe range of reducer pipe | |
| CN102298114A (en) | Dynamic test system of magnetic levitation system | |
| CN108992068A (en) | A kind of phase compensating circuit, magnetic induction image device and phase compensating method | |
| CN105092243A (en) | Gear fault positioning system and method | |
| CN104227501A (en) | Testing and analyzing system for rotating errors of main shaft | |
| CN206099914U (en) | a lock-in amplifier | |
| CN108195897A (en) | A kind of higher-order of oscillation soil humidity measuring system | |
| CN108872374B (en) | A device based on electromagnetic eddy current to detect the defect position of the inner and outer walls of the pipeline | |
| CN105067048A (en) | Vibration interference resisting measuring method of digitalized vortex shedding flowmeter | |
| CN104061970B (en) | Electromagnetic flow signal detection method | |
| CN202886471U (en) | Multi-channel leakage current phase difference detection equipment | |
| CN202562940U (en) | Direct current motor rotating speed detector based on FFT (Fast Fourier Transformation) | |
| CN205120957U (en) | Modulate circuit of doppler signal under very noisy background | |
| CN111044753B (en) | Device and method for measuring flow velocity of dust-containing flue gas | |
| CN106840470B (en) | A kind of bridge type pressure sensor output signal acquisition device and method | |
| CN204423093U (en) | A kind of data acquisition processing system of low speed roundness measuring equipment | |
| CN104840201A (en) | Main flow type breathing flow real-time monitoring device and method | |
| CN108254794A (en) | A kind of magnetic resonance noise-eliminating method and device based on the anti-recovery technology of modeling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |