CN105116379A - Doppler signal conditioning circuit in strong-noise background - Google Patents
Doppler signal conditioning circuit in strong-noise background Download PDFInfo
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- CN105116379A CN105116379A CN201510459950.5A CN201510459950A CN105116379A CN 105116379 A CN105116379 A CN 105116379A CN 201510459950 A CN201510459950 A CN 201510459950A CN 105116379 A CN105116379 A CN 105116379A
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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
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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
- G01S7/40—Means for monitoring or calibrating
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Abstract
The invention discloses a Doppler signal conditioning circuit in a strong-noise background, which comprises a pre-amplifier unit, a real-time fault detection unit and a signal filtering unit. The signal filtering unit comprises a filtering conditioning circuit in a dual-antenna working mode and an adaptive filtering conditioning circuit in a single-antenna working mode. Weak Doppler signals output by radar antennas first pass through the pre-amplifier unit. Meanwhile, the working states of the radar antennas are detected in a real-time manner. After being amplified, the signals are further filtered and conditioned and further sent to a rear stage for sampling and operational processing. The conditioning circuit can extract weak Doppler signals from a strong-noise background and acquire useful signals with a high signal to noise ratio. Rear-stage signal processing errors can be greatly decreased. The velocity measurement precision can be further improved.
Description
Technical field
The present invention relates to radar velocity measurement sensor field, in particular, the present invention relates to the modulate circuit of Doppler signal under a kind of strong noise background.
Background technology
Owing to lacking systematic study and tackling problems in key technologies, China's locomotive velocity measuring system mainly adopts traditional speed-measuring method, high-performance locomotive velocity measuring instrument is monopolized by advanced countries such as American-European and Japan for a long time, and instrument price costliness, device maintenance, technical service lack guarantee, and sector application cost is very high.Radar velocity measurement instrument is in locomotive driving process, and due to factor impacts such as vibration, environmental changes, Doppler signal will be subject to the interference of various noise, extracts the useful signal of high s/n ratio from very noisy, and the signal transacting for rear class is vital.
Summary of the invention
The present invention seeks to, under the environment of very noisy interference, to provide a kind of modulate circuit obtaining high s/n ratio Doppler signal, be in real time, high precision, high stability velocity survey condition precedent.
The technical solution adopted for the present invention to solve the technical problems is:
The modulate circuit of Doppler signal under a kind of strong noise background, it is characterized in that: include pre-amplifier unit, real-time fault detection unit, signal filtering unit, wherein signal filtering unit comprises the filtering modulate circuit under double antenna mode of operation and the auto adapted filtering modulate circuit under single antenna mode of operation, radar antenna respectively with pre-amplifier unit, the signal input part of real-time fault detection unit connects, the signal output part of pre-amplifier unit is connected with the signal input part of signal filtering unit, signal filtering unit, the signal output part of real-time fault detection unit is connected with the signal input part of signal processing unit, the signal output part of signal processing unit connects communication and external interface, the faint Doppler signal that radar antenna exports, first through pre-amplifier unit, detects the duty of radar antenna simultaneously in real time, and signal does filtering conditioning further after amplifying, then sends into rear class and sample and calculation process.
The modulate circuit of Doppler signal under described a kind of strong noise background, it is characterized in that the circuit of described pre-amplifier unit is: Doppler's I signal meets electric capacity C1, 1 pin of another termination instrument amplifier U2 of electric capacity C1 and 10 pin of operational amplifier U1C, meet pull down resistor R13 simultaneously, 8 of operational amplifier U1C, 9 pin are connected and make voltage follower, the 8 pin connecting resistance R5 of operational amplifier U1C, 6 pin of another termination operational amplifier U1B of resistance R5, 7 pin that 6 pin of operational amplifier U1B meet operational amplifier U1B through resistance R6 do reverse ratio, 7 pin of operational amplifier U1B connect 16 pin of instrument amplifier U2 simultaneously, Doppler's Q signal meets electric capacity C2, and 2,15 pin of another termination instrument amplifier U2 of electric capacity C2, meet pull down resistor R19 simultaneously, the indirect resistance R14 of 3,4 pin of instrument amplifier U2, 5, the 12 pin ground connection of instrument amplifier U2, 6,7 pin of instrument amplifier U2 connect Doppler signal A road and amplify output, do further process to signal filtering unit, 8 pin of instrument amplifier U2 connect-5V power supply, meet filter capacitor C7, C11 simultaneously, 9 pin of instrument amplifier U2 connect+5V power supply, meet filter capacitor C8, C12 simultaneously, 10,11 pin of instrument amplifier U2 connect Doppler signal B road and amplify output, do further process to signal filtering unit, the indirect resistance R15 of 13,14 pin of instrument amplifier U2.
The modulate circuit of Doppler signal under described a kind of strong noise background, is characterized in that the circuit of described real-time fault detection unit is: another termination filter capacitor C15 of Doppler's I signal connecting resistance R7, resistance R7, connects 2 pin of operational amplifier U1A simultaneously; 3 pin of operational amplifier U1A are connected with 12 pin of operational amplifier U1D, and meet divider resistance R16 to ground, meet divider resistance R9 to-5V simultaneously; 4 pin of operational amplifier U1A connect+5V power supply, meet filter capacitor C3, C9 simultaneously; 11 pin of operational amplifier U1A connect-5V power supply, meet filter capacitor C4, C10 simultaneously; 1 pin of operational amplifier U1A meets divider resistance R17, and resistance R17 meets divider resistance R11, connects the base stage of triode Q1 simultaneously; Another termination filter capacitor C16 of Doppler's Q signal connecting resistance R10, resistance R10, connects 12 pin of operational amplifier U1D simultaneously; 14 pin of operational amplifier U1D meet divider resistance R18, and divider resistance R18 meets divider resistance R12, connect the base stage of triode Q2 simultaneously; The grounded emitter of triode Q2, the emitter of the collector connecting transistor Q1 of triode Q2, the collector of triode Q1 connects pull-up resistor R8 to+5V, connects simultaneously and outputs to signal processing unit.
The modulate circuit of Doppler signal under described a kind of strong noise background, it is characterized in that the filtering modulate circuit under described double antenna mode of operation is: DOP-_OUT exports and meets electric capacity C96, the electric capacity C96 other end receives 2 pin of operational amplifier U7A by resistance R9, the 3 pin ground connection of operational amplifier U7A, 2 pin of operational amplifier U7A receive 1 pin of operational amplifier U7A by resistance R12 and electric capacity C112; 4 pin of operational amplifier U7A connect+5V power supply, meet filter capacitor C10, C76 simultaneously; 11 pin of operational amplifier U7A connect-5V power supply, meet filter capacitor C11, C77 simultaneously; The 1 pin connecting resistance R58 of operational amplifier U7A, the other end connecting resistance R60 of resistance R58, connects 6 pin of electric capacity C121 to operational amplifier U7B simultaneously; Another termination filter capacitor C122 of resistance R60, connects 5 pin of operational amplifier U7B simultaneously; 6,7 pin of operational amplifier U7B are connected, and synchronous signal outputs to signal processing unit and samples for AD; DOP+_OUT exports and meets electric capacity C95,6 pin of another termination operational amplifier U10B of the other end connecting resistance R10 of electric capacity C95, resistance R10, simultaneously connecting resistance R11 and electric capacity C111; The 5 pin ground connection of operational amplifier U10B; The 7 pin connecting resistance R11 of operational amplifier U10B and electric capacity C111, simultaneously connecting resistance R3; The other end of the 3 pin connecting resistance R3 of operational amplifier U10A, connects 1 of potentiometer VR1,2 pin simultaneously, the 3 pin ground connection of potentiometer VR1; The 2 pin connecting resistance R17 of operational amplifier U10A to ground, 1 pin of connecting resistance R18 to operational amplifier U10A simultaneously; 4 pin of operational amplifier U10A connect-5V power supply, meet filter capacitor C13, C79 simultaneously; 8 pin of operational amplifier U10A connect+5V power supply, meet filter capacitor C12, C78 simultaneously; The 1 pin connecting resistance R61 of operational amplifier U10A, the other end connecting resistance R63 of resistance R61, connects 2 pin of electric capacity C123 to operational amplifier U11A simultaneously; Another termination filter capacitor C124 of resistance R63, connects 3 pin of operational amplifier U11A simultaneously; 4 pin of operational amplifier U11A connect-5V power supply, meet filter capacitor C16, C81 simultaneously; 8 pin of operational amplifier U11A connect+5V power supply, meet filter capacitor C15, C80 simultaneously; 1,2 pin of operational amplifier U11A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
The modulate circuit of Doppler signal under described a kind of strong noise background, it is characterized in that the auto adapted filtering modulate circuit under described single antenna mode of operation is: the 1 pin connecting resistance R93 of operational amplifier U10A, 5 pin of another termination operational amplifier U8B of resistance R93, receive 2 pin of low-pass Bessel filter U13 after 6,7 pin of operational amplifier U8B are connected; 3,5, the 11 pin ground connection of low-pass Bessel filter U13; 4 pin of low-pass Bessel filter U13 connect+5V power supply by resistance R80, and+5V meets diode D3 and electric capacity C27 simultaneously; 14 pin of low-pass Bessel filter U13 connect-5V power supply by resistance R77, and-5V meets diode D1 and electric capacity C14 simultaneously; 8,16 pin of low-pass Bessel filter U13 are connected; 12 pin of low-pass Bessel filter U13 meet the CLK of signal processing unit; The 9 pin connecting resistance R70 of low-pass Bessel filter U13, the other end of resistance R70 connects 2 pin of operational amplifier U8A by electric capacity C129, simultaneously connecting resistance R71; Another termination filter capacitor C130 of resistance R71, connects 3 pin of operational amplifier U8A simultaneously; 4 pin of operational amplifier U8A connect+5V power supply, meet filter capacitor C7, C86 simultaneously; 8 pin of operational amplifier U8A connect-5V power supply, meet filter capacitor C28, C87 simultaneously; 1,2 pin of operational amplifier U8A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
The present invention's beneficial effect compared with prior art:
1) in the enlarge leadingly of Doppler signal, adopt the instrument amplifier of high input impedance, high cmrr, improve the quality of Doppler signal under strong noise background;
2) adopt quadrature channel technology, while raising velocity survey precision, the differentiation of direction of motion can be realized;
3) real-time fault detection technology is adopted, according to the duty of radar antenna, adaptively selected suitable mode of operation;
4) under double antenna mode of operation, front end single order anti-phase Hi-pass filter filtering low-frequency disturbance, rear end step low-pass Butterworth filter, effective filtering high frequency interference, and serve anti-aliasing effect; By variable gain low-noise amplifier, two-way Doppler signal amplitude size is mated, reduce signal amplitude to the impact of signal measurement precision;
5) under single antenna mode of operation, adopt the multistage low-pass Bessel filter of low pass, achieve the self-adaptive processing of signal frequency, greatly improve the quality of signal, the precision that pulling speed is measured.
accompanying drawing illustrates:
Fig. 1 is the structured flowchart of the modulate circuit of Doppler signal under strong noise background.
Fig. 2 is the circuit theory diagrams of enlarge leadingly in the present invention.
Fig. 3 is the circuit theory diagrams of real-time fault detection in the present invention.
The circuit theory diagrams of signal filtering under double antenna mode of operation when Fig. 4-1 is DOP-_OUT signal access in the present invention.
The circuit theory diagrams of signal filtering under double antenna mode of operation when Fig. 4-2 is DOP+_OUT signal accesses in the present invention.
Fig. 5 is the circuit theory diagrams of self-adapting signal filtering under single antenna mode of operation in the present invention.
embodiment:
As shown in Figure 1, the modulate circuit of Doppler signal under strong noise background, include pre-amplifier unit 2, real-time fault detection unit 3, signal filtering unit 4, wherein signal filtering unit 4 comprises the filtering modulate circuit under double antenna mode of operation and the auto adapted filtering modulate circuit under single antenna mode of operation, radar antenna 1 respectively with pre-amplifier unit 2, the signal input part of real-time fault detection unit 3 connects, the signal output part of pre-amplifier unit 2 is connected with the signal input part of signal filtering unit 4, signal filtering unit 4, the signal output part of real-time fault detection unit 3 is connected with the signal input part of signal processing unit 5, the signal output part of signal processing unit 5 connects communication and external interface 6, the faint Doppler signal that radar antenna 1 exports, first through pre-amplifier unit 2, detects the duty of radar antenna simultaneously in real time, and signal does filtering conditioning further after amplifying, then sends into rear class and sample and calculation process.
Initial I, Q two-way Doppler signal is direct current biasing is the sinusoidal signal of about-1V, sinusoidal signal amplitude usually only have several mV, be vulnerable to the interference of outside noise.For meeting the accuracy requirement of rear class to signal and the judgement of direction of motion, that has selected high input impedance, high cmrr carries out differential amplification, exports the Doppler signal of two-way high s/n ratio; Meanwhile, the amplitude of I, Q two paths of signals depends primarily on DC offset voltage, therefore adopts two-way voltage comparator circuit, judges that whether Antenna Operation is normal by the level exported.The two-way Doppler signal that enlarge leadingly exports does filtering process further, be divided into double antenna mode of operation and single antenna mode of operation, wherein single antenna pattern does auto adapted filtering to a wherein road Doppler signal, according to the frequency filtering of actual speed adjustment low-pass Bessel filter, thus promote the velocity survey precision under single antenna pattern.
As shown in Figure 2, the circuit of pre-amplifier unit is: Doppler's I signal meets electric capacity C1,1 pin of another termination instrument amplifier U2 of electric capacity C1 and 10 pin of operational amplifier U1C, meet pull down resistor R13 simultaneously, 8,9 pin of operational amplifier U1C are connected and make voltage follower, the 8 pin connecting resistance R5 of operational amplifier U1C, 6 pin of another termination operational amplifier U1B of resistance R5,7 pin that 6 pin of operational amplifier U1B meet operational amplifier U1B through resistance R6 do reverse ratio, and 7 pin of operational amplifier U1B connect 16 pin of instrument amplifier U2 simultaneously; Doppler's Q signal meets electric capacity C2, and 2,15 pin of another termination instrument amplifier U2 of electric capacity C2, meet pull down resistor R19 simultaneously; The indirect resistance R14 of 3,4 pin of instrument amplifier U2; 5, the 12 pin ground connection of instrument amplifier U2; 6,7 pin of instrument amplifier U2 connect Doppler signal A road and amplify output, do further process to signal filtering unit; 8 pin of instrument amplifier U2 connect-5V power supply, meet filter capacitor C7, C11 simultaneously; 9 pin of instrument amplifier U2 connect+5V power supply, meet filter capacitor C8, C12 simultaneously; 10,11 pin of instrument amplifier U2 connect Doppler signal B road and amplify output, do further process to signal filtering unit; The indirect resistance R15 of 13,14 pin of instrument amplifier U2.
First to I, Q signal through high-pass filtering, the direct current biasing composition in filtered signal, on the one hand two paths of signals is as a road Differential Input of instrument amplifier U2, regulates R14 to change the gain size of signal, obtains a road Doppler signal DOP+_OUT and export; I signal oppositely amplifying in proportion through low-noise operational amplifier U1 on the other hand, another road Differential Input of U2 is done again with Q signal, R15 is regulated to change the gain size of signal, obtain another road Doppler signal DOP-_OUT to export, the traffic direction of train can be judged according to the phase differential of two-way output signal.
As shown in Figure 3, the circuit of real-time fault detection unit is: another termination filter capacitor C15 of Doppler's I signal connecting resistance R7, resistance R7, connects 2 pin of operational amplifier U1A simultaneously; 3 pin of operational amplifier U1A are connected with 12 pin of operational amplifier U1D, and meet divider resistance R16 to ground, meet divider resistance R9 to-5V simultaneously; 4 pin of operational amplifier U1A connect+5V power supply, meet filter capacitor C3, C9 simultaneously; 11 pin of operational amplifier U1A connect-5V power supply, meet filter capacitor C4, C10 simultaneously; 1 pin of operational amplifier U1A meets divider resistance R17, and resistance R17 meets divider resistance R11, connects the base stage of triode Q1 simultaneously; Another termination filter capacitor C16 of Doppler's Q signal connecting resistance R10, resistance R10, connects 12 pin of operational amplifier U1D simultaneously; 14 pin of operational amplifier U1D meet divider resistance R18, and divider resistance R18 meets divider resistance R12, connect the base stage of triode Q2 simultaneously; The grounded emitter of triode Q2, the emitter of the collector connecting transistor Q1 of triode Q2, the collector of triode Q1 connects pull-up resistor R8 to+5V, connects simultaneously and outputs to signal processing unit.
Real-time fault detection circuit is: the original signal of I, Q is the sinusoidal Doppler signal of-1V left and right bias voltage, the amplitude of useful signal only has several mV, by after RC filtering circuit with setting negative voltage compared with, show that the bias voltage of I, Q is correct lower than this voltage, comparer exports high level, when I, Q two paths of signals is all normal, and triode Q1 and Q2 conducting simultaneously, fault detection signal exports as low level, and Antenna Operation is normal; Otherwise fault detection signal exports high level, and antenna breaks down.
As shown in Figure 4, filtering modulate circuit under double antenna mode of operation is: DOP-_OUT exports and meets electric capacity C96, the electric capacity C96 other end receives 2 pin of operational amplifier U7A by resistance R9, the 3 pin ground connection of operational amplifier U7A, 2 pin of operational amplifier U7A receive 1 pin of operational amplifier U7A by resistance R12 and electric capacity C112; 4 pin of operational amplifier U7A connect+5V power supply, meet filter capacitor C10, C76 simultaneously; 11 pin of operational amplifier U7A connect-5V power supply, meet filter capacitor C11, C77 simultaneously; The 1 pin connecting resistance R58 of operational amplifier U7A, the other end connecting resistance R60 of resistance R58, connects 6 pin of electric capacity C121 to operational amplifier U7B simultaneously; Another termination filter capacitor C122 of resistance R60, connects 5 pin of operational amplifier U7B simultaneously; 6,7 pin of operational amplifier U7B are connected, and synchronous signal outputs to signal processing unit and samples for AD; DOP+_OUT exports and meets electric capacity C95,6 pin of another termination operational amplifier U10B of the other end connecting resistance R10 of electric capacity C95, resistance R10, simultaneously connecting resistance R11 and electric capacity C111; The 5 pin ground connection of operational amplifier U10B; The 7 pin connecting resistance R11 of operational amplifier U10B and electric capacity C111, simultaneously connecting resistance R3; The other end of the 3 pin connecting resistance R3 of operational amplifier U10A, connects 1 of potentiometer VR1,2 pin simultaneously, the 3 pin ground connection of potentiometer VR1; The 2 pin connecting resistance R17 of operational amplifier U10A to ground, 1 pin of connecting resistance R18 to operational amplifier U10A simultaneously; 4 pin of operational amplifier U10A connect-5V power supply, meet filter capacitor C13, C79 simultaneously; 8 pin of operational amplifier U10A connect+5V power supply, meet filter capacitor C12, C78 simultaneously; The 1 pin connecting resistance R61 of operational amplifier U10A, the other end connecting resistance R63 of resistance R61, connects 2 pin of electric capacity C123 to operational amplifier U11A simultaneously; Another termination filter capacitor C124 of resistance R63, connects 3 pin of operational amplifier U11A simultaneously; 4 pin of operational amplifier U11A connect-5V power supply, meet filter capacitor C16, C81 simultaneously; 8 pin of operational amplifier U11A connect+5V power supply, meet filter capacitor C15, C80 simultaneously; 1,2 pin of operational amplifier U11A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
Filtering modulate circuit under double antenna mode of operation is: Doppler signal is after enlarge leadingly, need further filtering, wherein first DOP-_OUT does single order high-pass filtering through electric capacity C96 to inverting amplifier U7A, do second-order low-pass filter through low noise amplifier U7B again, signal is sent to signal processing unit and carries out AD sampling; First DOP+_OUT does single order high-pass filtering through electric capacity C95 to inverting amplifier U10B, the decay utilizing dividing potential drop and homophase to amplify to realize signal or amplify adjustable, by the resistance of regulator potentiometer, two-way Doppler signal amplitude size is mated, again through low noise amplifier U11A second-order low-pass filter, signal is sent to signal processing unit and carries out AD sampling.
As shown in Figure 5, auto adapted filtering modulate circuit under single antenna mode of operation is: the 1 pin connecting resistance R93 of operational amplifier U10A, 5 pin of another termination operational amplifier U8B of resistance R93, receive 2 pin of low-pass Bessel filter U13 after 6,7 pin of operational amplifier U8B are connected; 3,5, the 11 pin ground connection of low-pass Bessel filter U13; 4 pin of low-pass Bessel filter U13 connect+5V power supply by resistance R80, and+5V meets diode D3 and electric capacity C27 simultaneously; 14 pin of low-pass Bessel filter U13 connect-5V power supply by resistance R77, and-5V meets diode D1 and electric capacity C14 simultaneously; 8,16 pin of low-pass Bessel filter U13 are connected; 12 pin of low-pass Bessel filter U13 meet the CLK of signal processing unit; The 9 pin connecting resistance R70 of low-pass Bessel filter U13, the other end of resistance R70 connects 2 pin of operational amplifier U8A by electric capacity C129, simultaneously connecting resistance R71; Another termination filter capacitor C130 of resistance R71, connects 3 pin of operational amplifier U8A simultaneously; 4 pin of operational amplifier U8A connect+5V power supply, meet filter capacitor C7, C86 simultaneously; 8 pin of operational amplifier U8A connect-5V power supply, meet filter capacitor C28, C87 simultaneously; 1,2 pin of operational amplifier U8A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
Auto adapted filtering modulate circuit under single antenna mode of operation is: DOP+_OUT signal is after amplitude coupling, connecting resistance R93 on the other hand, as the input of low-pass Bessel filter U13 after voltage follower, U13 adopts dual power supply ± 5V to power, the interference of ± 5V electric capacity and schottky diode filtering noise, to connect the power input of 10 Ω resistance to U13, weaken the impact that current fluctuation causes.The CLK of the 12pin outer signal processing unit of U13, as frequency filtering control inputs, automatically selects suitable CLK frequency according to the difference of speed, thus realizes the auto adapted filtering of signal.
Claims (5)
1. the modulate circuit of Doppler signal under a strong noise background, it is characterized in that: include pre-amplifier unit, real-time fault detection unit, signal filtering unit, wherein signal filtering unit comprises the filtering modulate circuit under double antenna mode of operation and the auto adapted filtering modulate circuit under single antenna mode of operation, radar antenna respectively with pre-amplifier unit, the signal input part of real-time fault detection unit connects, the signal output part of pre-amplifier unit is connected with the signal input part of signal filtering unit, signal filtering unit, the signal output part of real-time fault detection unit is connected with the signal input part of signal processing unit, the signal output part of signal processing unit connects communication and external interface, the faint Doppler signal that radar antenna exports, first through pre-amplifier unit, detects the duty of radar antenna simultaneously in real time, and signal does filtering conditioning further after amplifying, then sends into rear class and sample and calculation process.
2. the modulate circuit of Doppler signal under a kind of strong noise background according to claim 1, it is characterized in that the circuit of described pre-amplifier unit is: Doppler's I signal meets electric capacity C1, 1 pin of another termination instrument amplifier U2 of electric capacity C1 and 10 pin of operational amplifier U1C, meet pull down resistor R13 simultaneously, 8 of operational amplifier U1C, 9 pin are connected and make voltage follower, the 8 pin connecting resistance R5 of operational amplifier U1C, 6 pin of another termination operational amplifier U1B of resistance R5, 7 pin that 6 pin of operational amplifier U1B meet operational amplifier U1B through resistance R6 do reverse ratio, 7 pin of operational amplifier U1B connect 16 pin of instrument amplifier U2 simultaneously, Doppler's Q signal meets electric capacity C2, and 2,15 pin of another termination instrument amplifier U2 of electric capacity C2, meet pull down resistor R19 simultaneously, the indirect resistance R14 of 3,4 pin of instrument amplifier U2, 5, the 12 pin ground connection of instrument amplifier U2, 6,7 pin of instrument amplifier U2 connect Doppler signal A road and amplify output, do further process to signal filtering unit, 8 pin of instrument amplifier U2 connect-5V power supply, meet filter capacitor C7, C11 simultaneously, 9 pin of instrument amplifier U2 connect+5V power supply, meet filter capacitor C8, C12 simultaneously, 10,11 pin of instrument amplifier U2 connect Doppler signal B road and amplify output, do further process to signal filtering unit, the indirect resistance R15 of 13,14 pin of instrument amplifier U2.
3. the modulate circuit of Doppler signal under a kind of strong noise background according to claim 1, it is characterized in that the circuit of described real-time fault detection unit is: Doppler's I signal connecting resistance R7, another termination filter capacitor C15 of resistance R7, connects 2 pin of operational amplifier U1A simultaneously; 3 pin of operational amplifier U1A are connected with 12 pin of operational amplifier U1D, and meet divider resistance R16 to ground, meet divider resistance R9 to-5V simultaneously; 4 pin of operational amplifier U1A connect+5V power supply, meet filter capacitor C3, C9 simultaneously; 11 pin of operational amplifier U1A connect-5V power supply, meet filter capacitor C4, C10 simultaneously; 1 pin of operational amplifier U1A meets divider resistance R17, and resistance R17 meets divider resistance R11, connects the base stage of triode Q1 simultaneously; Another termination filter capacitor C16 of Doppler's Q signal connecting resistance R10, resistance R10, connects 12 pin of operational amplifier U1D simultaneously; 14 pin of operational amplifier U1D meet divider resistance R18, and divider resistance R18 meets divider resistance R12, connect the base stage of triode Q2 simultaneously; The grounded emitter of triode Q2, the emitter of the collector connecting transistor Q1 of triode Q2, the collector of triode Q1 connects pull-up resistor R8 to+5V, connects simultaneously and outputs to signal processing unit.
4. the modulate circuit of Doppler signal under a kind of strong noise background according to claim 1, it is characterized in that the filtering modulate circuit under described double antenna mode of operation is: DOP-_OUT exports and meets electric capacity C96, the electric capacity C96 other end receives 2 pin of operational amplifier U7A by resistance R9, the 3 pin ground connection of operational amplifier U7A, 2 pin of operational amplifier U7A receive 1 pin of operational amplifier U7A by resistance R12 and electric capacity C112; 4 pin of operational amplifier U7A connect+5V power supply, meet filter capacitor C10, C76 simultaneously; 11 pin of operational amplifier U7A connect-5V power supply, meet filter capacitor C11, C77 simultaneously; The 1 pin connecting resistance R58 of operational amplifier U7A, the other end connecting resistance R60 of resistance R58, connects 6 pin of electric capacity C121 to operational amplifier U7B simultaneously; Another termination filter capacitor C122 of resistance R60, connects 5 pin of operational amplifier U7B simultaneously; 6,7 pin of operational amplifier U7B are connected, and synchronous signal outputs to signal processing unit and samples for AD; DOP+_OUT exports and meets electric capacity C95,6 pin of another termination operational amplifier U10B of the other end connecting resistance R10 of electric capacity C95, resistance R10, simultaneously connecting resistance R11 and electric capacity C111; The 5 pin ground connection of operational amplifier U10B; The 7 pin connecting resistance R11 of operational amplifier U10B and electric capacity C111, simultaneously connecting resistance R3; The other end of the 3 pin connecting resistance R3 of operational amplifier U10A, connects 1 of potentiometer VR1,2 pin simultaneously, the 3 pin ground connection of potentiometer VR1; The 2 pin connecting resistance R17 of operational amplifier U10A to ground, 1 pin of connecting resistance R18 to operational amplifier U10A simultaneously; 4 pin of operational amplifier U10A connect-5V power supply, meet filter capacitor C13, C79 simultaneously; 8 pin of operational amplifier U10A connect+5V power supply, meet filter capacitor C12, C78 simultaneously; The 1 pin connecting resistance R61 of operational amplifier U10A, the other end connecting resistance R63 of resistance R61, connects 2 pin of electric capacity C123 to operational amplifier U11A simultaneously; Another termination filter capacitor C124 of resistance R63, connects 3 pin of operational amplifier U11A simultaneously; 4 pin of operational amplifier U11A connect-5V power supply, meet filter capacitor C16, C81 simultaneously; 8 pin of operational amplifier U11A connect+5V power supply, meet filter capacitor C15, C80 simultaneously; 1,2 pin of operational amplifier U11A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
5. the modulate circuit of Doppler signal under a kind of strong noise background according to claim 1 or 4, it is characterized in that the auto adapted filtering modulate circuit under described single antenna mode of operation is: the 1 pin connecting resistance R93 of operational amplifier U10A, 5 pin of another termination operational amplifier U8B of resistance R93, receive 2 pin of low-pass Bessel filter U13 after 6,7 pin of operational amplifier U8B are connected; 3,5, the 11 pin ground connection of low-pass Bessel filter U13; 4 pin of low-pass Bessel filter U13 connect+5V power supply by resistance R80, and+5V meets diode D3 and electric capacity C27 simultaneously; 14 pin of low-pass Bessel filter U13 connect-5V power supply by resistance R77, and-5V meets diode D1 and electric capacity C14 simultaneously; 8,16 pin of low-pass Bessel filter U13 are connected; 12 pin of low-pass Bessel filter U13 meet the CLK of signal processing unit; The 9 pin connecting resistance R70 of low-pass Bessel filter U13, the other end of resistance R70 connects 2 pin of operational amplifier U8A by electric capacity C129, simultaneously connecting resistance R71; Another termination filter capacitor C130 of resistance R71, connects 3 pin of operational amplifier U8A simultaneously; 4 pin of operational amplifier U8A connect+5V power supply, meet filter capacitor C7, C86 simultaneously; 8 pin of operational amplifier U8A connect-5V power supply, meet filter capacitor C28, C87 simultaneously; 1,2 pin of operational amplifier U8A are connected, and synchronous signal outputs to signal processing unit and samples for AD.
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| CN201510459950.5A CN105116379B (en) | 2015-07-28 | 2015-07-28 | The conditioning circuit of Doppler signal under strong noise background |
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| CN201510459950.5A CN105116379B (en) | 2015-07-28 | 2015-07-28 | The conditioning circuit of Doppler signal under strong noise background |
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Cited By (4)
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| CN105547632A (en) * | 2015-12-09 | 2016-05-04 | 安徽省计量科学研究院 | Novel method for calibrating or calibrating impact velocity by using impact velocity measuring device |
| CN107296599A (en) * | 2017-05-16 | 2017-10-27 | 武汉思创电子有限公司 | A kind of multi leads ECG signal condition and data acquisition circuit |
| CN107666300A (en) * | 2017-11-03 | 2018-02-06 | 国网江苏省电力公司电力科学研究院 | Signal filtering process Compare System based on analog-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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547632A (en) * | 2015-12-09 | 2016-05-04 | 安徽省计量科学研究院 | Novel method for calibrating or calibrating impact velocity by using impact velocity measuring device |
| CN107296599A (en) * | 2017-05-16 | 2017-10-27 | 武汉思创电子有限公司 | A kind of multi leads ECG signal condition and data acquisition circuit |
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| 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 |
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