CN107765085A - A kind of signal supervisory instrument and method - Google Patents
A kind of signal supervisory instrument and method Download PDFInfo
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- CN107765085A CN107765085A CN201711127152.8A CN201711127152A CN107765085A CN 107765085 A CN107765085 A CN 107765085A CN 201711127152 A CN201711127152 A CN 201711127152A CN 107765085 A CN107765085 A CN 107765085A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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Abstract
The present invention discloses a kind of signal supervisory instrument and method.The device includes：Signal conditioning circuit, sef-adapting filter, orthogonal reference signal source, lock-in amplifier, amplitude phase detection module；The input of signal conditioning circuit receives measured signal, the signal input part of the output end connection sef-adapting filter of signal conditioning circuit；The output end of sef-adapting filter connects the first input end of two lock-in amplifiers simultaneously；Second input of the first lock-in amplifier receives the first reference signal that orthogonal reference signal source is sent；Second input of the second lock-in amplifier receives the second reference signal that orthogonal reference signal source is sent, and the second reference signal is with frequency orthogonal signalling with the first reference signal；Amplitude phase detection module exports the amplitude and phase of measured signal according to the output signal of the first lock-in amplifier and the output signal of the second lock-in amplifier.Using the device and method of invention, the measured signal of any scope can recover completely, and the degree of accuracy is high.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of signal supervisory instrument and method.
Background technology
In fields such as frequency analysis, frequency characteristic measurement, impedance spectrometry, Radar Signal Detections, generally exist various dry
Disturb, disturb essentially from ambient noise, circuit interference and artificial disturbance.In some cases, measured signal is even disturbed floods
Not yet.
In order to which detection signal frequency is with time dynamic variable signal (i.e. signal frequency, amplitude and phase information), work as interference
When smaller, it can be realized with the method for routine, signal detection process can also be realized using IC chip；When SNR (letters
Make an uproar ratio) when being less than 0dB, conventional detection method is difficult to complete detection, it is necessary to first filter out interference, then carries out signal detection.This
A little methods mainly have：(1) for the signal of fixed frequency, the universal method used both at home and abroad is to be made an uproar using wave filter to eliminate
Sound.But problem is the low pass of fixed cut-off frequency or centre frequency, band logical filter if signal frequency is in larger range
Ripple device can not realize frequency-tracking.So generally use can realize that the sef-adapting filter of frequency-tracking suppresses noise, detection has
Use signal.But the noise for falling in filter passband can not filter out.(2) lock-in amplifier is utilized.This method effect compared with
It is good, but when SNR is less than -20dB and signal frequency is in certain frequency range, because the frequency spectrum of noise is very wide, cause
The linearity, the change of sensitivity of amplifier are larger, individually undesirable using the effect of lock-in amplifier.Therefore, existing signal
Detection means and method, the signal of particular range can only be detected, when being detected for the signal without particular range,
Detection results are poor, and precision is low.
The content of the invention
It is an object of the invention to provide a kind of signal supervisory instrument and method, for the signal of any scope, can carry out
Accurately detection, improve accuracy of detection.
To achieve the above object, the invention provides following scheme：
A kind of signal supervisory instrument, described device include：Signal conditioning circuit, sef-adapting filter, orthogonal reference signal
Source, lock-in amplifier, amplitude phase detection module；The lock-in amplifier includes the first lock-in amplifier and the second locking amplification
Device；
The input of the signal conditioning circuit receives measured signal, described in the output end connection of the signal conditioning circuit
The signal input part of sef-adapting filter；
The output end of the sef-adapting filter connects the first input end of first lock-in amplifier and described simultaneously
The first input end of second lock-in amplifier, the sef-adapting filter are used for the output signal of the sef-adapting filter is same
When transmit to first lock-in amplifier and second lock-in amplifier；
Second input of first lock-in amplifier receives the first reference letter that the orthogonal reference signal source is sent
Number；Second input of second lock-in amplifier receives the second reference signal that the orthogonal reference signal source is sent, institute
It is with frequency orthogonal signalling that the second reference signal, which is stated, with first reference signal；
The amplitude phase detection module receives the output signal of first lock-in amplifier and second locking is put
The output signal of big device, the amplitude phase detection module are used for according to the output signal of first lock-in amplifier and described
The amplitude and phase of the output signal output measured signal of second lock-in amplifier.
Optionally, the signal conditioning circuit specifically includes：Input buffer module, one-level adjustable gain amplification module, two
Level adjustable gain amplification module, buffering isolation module and fixed gain amplification module；
The input of the input buffer module receives measured signal, the letter of the output end output of the input buffer module
Number pass sequentially through the one-level adjustable gain amplification module, the two level adjustable gain amplification module, the buffering isolation module
With the fixed gain amplification module, the output end of the fixed gain amplification module connects the sef-adapting filter；
The input buffer module includes first operational amplifier and resistance；
The one-level adjustable gain amplification module includes second operational amplifier, electric capacity and inductance；
The two level adjustable gain amplification module includes the second operational amplifier, electric capacity and the inductance；
The buffering isolation module includes first operational amplifier and resistance；
The fixed gain amplification module includes two the 3rd operational amplifiers and resistance.
Optionally, the model OPA842 of first operational amplifier, the model of second operational amplifier
AD603, the model AD811 of the 3rd operational amplifier.
Optionally, the sef-adapting filter specifically includes：Shaping circuit, frequency measurement circuit, FPGA module, frequency dividing circuit,
F/V change-over circuits, program-controlled voltage amplifying circuit and voltage controlled filter；
The shaping circuit receives the signal of the signal conditioning circuit output, for extracting the fundamental wave of signal and being transformed into
Square wave；
The frequency measurement circuit, which transmits the signal that the shaping circuit exports to the FPGA module, the FPGA module, to be used
In the fundamental frequency for the output signal for measuring the frequency measurement circuit；
The input of the FPGA module connects the output end of the frequency measurement circuit, the output end connection of the FPGA module
The frequency dividing circuit, the program-controlled voltage amplifying circuit and the voltage controlled filter；
The frequency dividing circuit receives the signal of the shaping circuit output, turns for signal frequency to be divided to the F/V
Change in the bandwidth range of circuit；
The F/V change-over circuits receive the signal of the frequency dividing circuit output, for being electricity by fundamental frequency signal frequency conversion
Pressure；
The input of the program-controlled voltage amplifying circuit receives the signal of the F/V change-over circuits output, for according to institute
State the control voltage of voltage controlled filter described in the voltage output of F/V change-over circuits output；
The signal and the program-controlled voltage amplifying circuit of the voltage controlled filter reception signal conditioning circuit output are defeated
The control voltage gone out, for being filtered to signal.
Optionally, first lock-in amplifier specifically includes：Multiplier, low-pass filter circuit and amplifying circuit；
The chip model that the multiplier uses is AD835；
The low-pass filter circuit includes MAX296 chips；
The amplifying circuit includes OP07 chips and resistance.
A kind of signal detecting method, methods described include：
Measured signal is amplified using the signal conditioning circuit in signal supervisory instrument, the signal after generation amplification；It is described
Signal supervisory instrument includes：Signal conditioning circuit, sef-adapting filter, orthogonal reference signal source, lock-in amplifier, amplitude phase
Detection module；The lock-in amplifier includes the first lock-in amplifier and the second lock-in amplifier；The signal conditioning circuit
Input receives measured signal, and the output end of the signal conditioning circuit connects the signal input part of the sef-adapting filter；
The output end of the sef-adapting filter connects the first input end of first lock-in amplifier and second locking simultaneously
The first input end of amplifier；Second input of first lock-in amplifier receives what the orthogonal reference signal source was sent
First reference signal；Second input of second lock-in amplifier receives the second ginseng that the orthogonal reference signal source is sent
Signal is examined, second reference signal is with frequency orthogonal signalling with first reference signal；The amplitude phase detection module
The output signal of first lock-in amplifier and the output signal of second lock-in amplifier are received, exports measured signal
Amplitude and phase；
The high fdrequency component in the signal after the amplification is filtered out using the sef-adapting filter, generates filtered letter
Number；
First lock-in amplifier is generated with mutually output according to the filtered signal with first reference signal
Signal；
Second lock-in amplifier generates orthogonal output according to the filtered signal and second reference signal
Signal；
The amplitude phase detection module obtains letter to be measured according to the In-phase output signal and the positive blending output signal
Number amplitude and phase.
Optionally, first lock-in amplifier generates same according to the filtered signal and first reference signal
Phase output signal, is specifically included：
Utilize formulaGenerate In-phase output signal Vx, wherein, A1For filtered signalAmplitude,For the phase of measured signal, A2It is first reference signal and the second reference letter
Number amplitude, first reference signal is：Vref=A2Sin ω t, second reference signal are：
Second lock-in amplifier generates orthogonal output according to the filtered signal and second reference signal
Signal, specifically include：Utilize formulaGenerate positive blending output signal Vy。
Optionally, the amplitude phase detection module obtains according to the In-phase output signal and the positive blending output signal
The amplitude and phase of measured signal, are specifically included：
Utilize formulaThe amplitude A of measured signal is obtained, wherein G is the gain times of signal conditioning circuit
Number；
Utilize formulaObtain the phase of measured signal
According to specific embodiment provided by the invention, the invention discloses following technique effect：
The change of sef-adapting filter energy real time dynamic tracing input signal, filter out part interference.Orthogonal reference signal source
Produce two-way to be multiplied with sef-adapting filter output signal through double-locking amplifier with frequency orthogonal reference signal, and filter out secondary humorous
DC component is obtained after ripple, sef-adapting filter is effectively eliminated and leads to in-band noise.Finally, amplitude phase detection module extracts
The amplitude and phase information of signal.Because the frequency of measured signal has been measured by sef-adapting filter, therefore measured signal
It can recover completely, unrelated with the scope of measured signal, the signal of any scope can use the device and method of the present invention accurate
Measure.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structure chart of signal supervisory instrument of the present invention；
Fig. 2 is the circuit diagram of the signal conditioning circuit of signal supervisory instrument of the present invention；
Fig. 3 is the structure chart of the sef-adapting filter of signal supervisory instrument of the present invention；
Fig. 4 is the circuit diagram of the lock-in amplifier of signal supervisory instrument of the present invention；
Fig. 5 is the flow chart of signal detecting method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Fig. 1 is the structure chart of signal supervisory instrument of the present invention.As shown in figure 1, described device includes：Signal conditioning circuit
101st, sef-adapting filter 102, orthogonal reference signal source 103, lock-in amplifier, amplitude phase detection module 106；The locking
Amplifier includes the first lock-in amplifier 104 and the second lock-in amplifier 105；
The input of the signal conditioning circuit 101 receives measured signal, and the output end of the signal conditioning circuit 101 connects
Connect the signal input part of the sef-adapting filter 102；
The output end of the sef-adapting filter 102 connects the first input end of first lock-in amplifier 104 simultaneously
With the first input end of second lock-in amplifier 105, the sef-adapting filter 102 is used for the sef-adapting filter
102 output signal simultaneous transmission is to first lock-in amplifier 104 and second lock-in amplifier 105；
Second input of first lock-in amplifier 104 receives first that the orthogonal reference signal source 103 is sent
Reference signal；Second input of second lock-in amplifier 105 receives second that the orthogonal reference signal source 103 is sent
Reference signal, second reference signal are with frequency orthogonal signalling with first reference signal；
The amplitude phase detection module 106 receives the output signal and described second of first lock-in amplifier 104
The output signal of lock-in amplifier 105, the amplitude phase detection module 106 are used for according to first lock-in amplifier 104
Output signal and second lock-in amplifier 105 output signal output measured signal amplitude and phase.
The effect of signal conditioning circuit 101 is by the weak signal of inputIt is amplified first to being sufficient for subsequent conditioning circuit work
The level of work, then filter out part interference through sef-adapting filter 102.102 filtered signal of sef-adapting filter is sent into the
One lock-in amplifier 104 and the second lock-in amplifier 105, the orthogonal reference signal phase exported respectively with orthogonal reference signal source 103
Multiply, in-phase signal is exported after low-pass filtered and amplificationAnd orthogonal signalling
Finally amplitude is obtained by amplitude phase detection module 106And phase
The dynamic of sef-adapting filter 102 tracking input signals and associated noises simultaneously filter out part interference, lock-in amplifier (104 Hes
105) simultaneously LPF, effectively filter that 102 filtered signal of sef-adapting filter is multiplied with two-way orthogonal reference signal are passed through
Except noise signal in the passband of sef-adapting filter 102, obtain including the direct current signal with signal amplitude and phase information.
Orthogonal reference signal source 103 can use Direct Digital Synthesizer (Direct Digital
Synthesizer, DDS) technology realize two-way with frequency orthogonal signalling FMAM export.Amplitude phase detection module 105 can
By the control AD Sampling device realizations pair of Digital Signal Processing (Digital SignalProcessing, DSP), FPGA or single-chip microcomputer
In-phase output signal VxWith positive blending output signal VySampling, thus calculate signal VsAmplitude A and phaseAnd shown,
The noisy weak signal (measured signal) of initialization system input For the phase of measured signal
Position, ω are the frequency of measured signal；
Amplify through signal conditioning circuit 101, be sent into after sef-adapting filter 102 filters out high fdrequency component and obtain following signal：
And A1=G × A, G are the gain factor of signal conditioning circuit 101.Meanwhile surveyed by sef-adapting filter 102
Measure the frequencies omega of input signal.
Orthogonal reference signal source 103 produces two-way and measured signal respectivelyWith the orthogonal signalling of frequency：
Through the first lock-in amplifier 104 and the second lock-in amplifier 105 respectively withWithIt is multiplied, and filters out secondary humorous
After ripple, In-phase output signal V is respectively obtainedxWith positive blending output signal Vy, wherein：
Then pass through the amplitude A that can be calculated measured signal of amplitude phase detection module 106,
The phase of measured signal
Fig. 2 is the circuit diagram of the signal conditioning circuit of signal supervisory instrument of the present invention.As shown in Fig. 2 signal conditioning circuit
Including：Input buffer module, one-level adjustable gain amplification module, two level adjustable gain amplification module, buffering isolation module and consolidate
Determine gain amplification module.The input of the input buffer module receives measured signal, the output end of the input buffer module
The signal of output passes sequentially through the one-level adjustable gain amplification module, the two level adjustable gain amplification module, the buffering
Isolation module and the fixed gain amplification module, the output end of the fixed gain amplification module connect the adaptive-filtering
Device；
The input buffer module includes first operational amplifier and resistance；As illustrated, JP2 is signal input
End, JP3 is signal output part.Input buffer module is made up of operational amplifier U1 (model OPA842) and resistance R4, and it draws
Pin connection is as follows：
1. U1 pins 7 and U1 pins 4 are positive-negative power end ,+5V and -5V are met respectively.
2. U1 pins 3 connect with resistance R4 one end, as signal input part, resistance R4 other ends ground connection.
3. U1 pins 2 and U1 pins 6 connect.Pin 6 is connected with the input of next stage simultaneously.
4. U1 pins 1 and U1 pins 8 are unused, in circuit vacantly.
The one-level adjustable gain amplification module includes the second operational amplifier (adjustable operational amplifier U2
(AD603)), electric capacity (C1) and inductance (L1)；The two level adjustable gain amplification module includes second operation amplifier
Device (U3 (AD603)), electric capacity (C2) and inductance (L2), the connection of its pin are as follows：
1. U2, U3 pin 8 and pin 6 are positive-negative power end ,+5V and -5V are met respectively.
2. U2, U3 pin 1 and pin 2 are respectively that the gain-controlled voltage of firsts and seconds variable gain amplifier is positive and negative
Input, gain-controlled voltage VgV can be usedg=VPOS-VNEGRepresent, wherein VPOSRepresent gain-controlled voltage positive input terminal voltage
Value, VNEGRepresent gain-controlled voltage negative input end magnitude of voltage.
Then it is per one step gain G control ranges：
G (dB)={ 40 × Vg+10|-500mV≤Vg≤-500mV}.
Amplified by two-stage adjustable gain, can be achieved to amplify input signal gain maximum 80dB continuously adjustabe.
3. U2, U3 pin 3 are signal input parts, it is connected respectively with one end of coupled capacitor C1, C2.Electric capacity C1, C2's
The other end is connected with the output end of upper level respectively.
4. U2, U3 pin 4 are amplifier common ports, one end with inductance L1, L2 is connected respectively.Inductance L1, L2's is another
End ground connection.
5. U2, U3 pin 5 are feedback ends, it is connected respectively with its output pin 7.Pin 7 amplifies with next stage simultaneously
Input connection.
The buffering isolation module includes first operational amplifier (U4 (OPA842)) and resistance (R5) forms, and it draws
Pin connection is as follows：
1. U4 pins 7 and pin 4 are positive-negative power end ,+5V and -5V are met respectively.
2. the output end that U4 pins 3 amplify with upper level connects.
3. U4 pins 2 and pin 6 connect, connecting resistance R5 wherein one end connects, and resistance R5 other ends ground connection, pin 6 is with
The input connection of one-level.
4. U4 pins 1 and pin 8 are unused, in circuit vacantly.
The fixed gain amplification module is including two the 3rd operational amplifiers (U5 (AD811), U6 (AD811)) and on a small quantity
Resistance, the connection of its pin are as follows：
1. U5, U6 pin 7 and pin 4 are positive-negative power end ,+5V and -5V are met respectively.
2. U5 pins 2 are connected with resistance R6, R7 wherein one end, resistance R6 other ends ground connection, resistance R7 another termination
U5 pins 6.
3. U5 pins 3 connect the output end of buffering isolation circuit.
4. U6 pins 2 are connected with resistance R9, R10 wherein one end, resistance R9 other ends ground connection, the resistance R10 other end
Connect U6 pins 6.
5. U6 pins 3 are connected with resistance R8 wherein one end, resistance R8 another termination U5 pin 6.
6. U6 pins 6 are the signal output parts of whole signal conditioning circuit, it is connected with circuit output terminal JP3.
Fig. 3 is the structure chart of the sef-adapting filter of signal supervisory instrument of the present invention.As shown in figure 3, the adaptive filter
Ripple implement body includes：Shaping circuit 301, frequency measurement circuit 302, FPGA module 303, frequency dividing circuit 304, F/V change-over circuits 305,
Program-controlled voltage amplifying circuit 306 and voltage controlled filter 307.
The shaping circuit 301 receives the signal of the signal conditioning circuit output；Exported for signal conditioning circuit
Signal,For the output signal after filtered, the effect of shaping circuit 301 is to extract the fundamental wave of signal and be converted into square
Shape ripple, it is easy to the measurement of signal frequency.
The frequency measurement circuit 302 transmits the signal that the shaping circuit exports to the FPGA module 303, the FPGA
Module 303 is used for the fundamental frequency for measuring the output signal of the frequency measurement circuit；Frequency measurement circuit 302 realizes letter using FPGA module 303
Quick, the real-time measurement of number fundamental frequency.
The input of the FPGA module 303 connects the output end of the frequency measurement circuit 302, the FPGA module 303
Output end connects frequency dividing circuit 304, the program-controlled voltage amplifying circuit 306 and the voltage controlled filter 307；FPGA module
303 are used to control frequency dividing ratio and select the filter type of voltage controlled filter 307.
The frequency dividing circuit 304 receives the signal that the shaping circuit 301 exports, for signal frequency to be divided to described
In the bandwidth range of F/V change-over circuits 305；
The F/V change-over circuits 305 receive the signal that the frequency dividing circuit 304 exports, for fundamental frequency signal frequency to be turned
Voltage is changed to, control voltage V is provided for voltage controlled filter 307c；Because the bandwidth of current F/V switching devices 305 is no more than
5MHz, therefore divided signal frequency to the bandwidth range of F/V switching devices 305 using frequency dividing circuit 304.
The input of the program-controlled voltage amplifying circuit 306 receives the signal that the F/V change-over circuits 305 export, and is used for
The control voltage of voltage controlled filter 307 described in the voltage output exported according to the F/V change-over circuits 305；Program-controlled voltage amplifies
The output voltage of F/V change-over circuits 305 is multiplied by corresponding frequency dividing ratio, made by circuit 306 according to the frequency dividing ratio of frequency dividing circuit 304
For the control voltage V of voltage controlled filter 307c。
The voltage controlled filter 307 receives the signal of the signal conditioning circuit output and the program-controlled voltage amplifying circuit
The control voltage of 306 outputs, for being filtered to signal.The selection of all circuit components considers high frequency characteristics.
Fig. 4 is the circuit diagram of the lock-in amplifier of signal supervisory instrument of the present invention.First lock-in amplifier and the second locking
Amplifier implementation method is consistent.Illustrate its embodiment by taking the first lock-in amplifier as an example, as shown in figure 4, the first locking
Amplifier specifically includes：Multiplier, low-pass filter circuit and amplifying circuit.
Multiplier is formed using model AD835 chip (U7) and a small amount of resistance, and the connection of its pin is as follows：
1. U7 pins 6 and U7 pins 3 are positive-negative power end ,+5V and -5V are met respectively.
2. U7 pins 5 are connected with a resistance R12 pin, R12 another pin and U7 pins 4 and resistance R13's
One pin connection, R13 another pin ground connection.
3. U7 pins 8 and U7 pins 1 are connected and are grounded.
4. U7 pins 7 connect signal endU7 pins 7 connect orthogonal signalling output endAfter connecting in the above described manner, multiplication
Device U7 output end signals can useRepresent.
Low-pass filter circuit is made up of model MAX296 chip (U8), and the connection of its pin is as follows：
1. U8 pins 7 and U8 pins 2 are positive-negative power end ,+5V and -5V are met respectively.
2. U8 pins 4 and U8 pins 3 connect.
3. U8 pins 1 meet external clock input CK, clock signal is provided for wave filter.
4. U8 pins 8 are filter signal input, it is connected with multiplier outputs, U8 pins 5 are that filtering signal is defeated
Go out end.
Amplifying circuit is made up of model OP07 chip (U9) and a small amount of resistance, and the connection of its pin is as follows：
1. U9 pins 7 and U9 pins 4 are positive-negative power end ,+5V and -5V are met respectively.
2. the one end of U9 pins 2 respectively with resistance R14, variable resistor RP1 connects, R14 another pin ground connection, RP1
Adjustable output end be connected with another fixing end, and be connected with U9 pins 6, output end of the U9 pins 6 as lock-in amplifier.
3. U9 pins 3 are connected with filter circuit output end (U8 pins 5).
Fig. 5 is the flow chart of signal detecting method of the present invention.Signal detecting method is using the detection means shown in Fig. 1, tool
The effect of body device is above-mentioned it has been already mentioned that here is omitted.As shown in figure 5, methods described includes：
Step 501：Signal conditioning circuit amplifies measured signal, the signal after generation amplification.
Step 502：The high fdrequency component in the signal after the amplification is filtered out using sef-adapting filter, generation is filtered
Signal.
Step 503：First lock-in amplifier generates In-phase output signal.First lock-in amplifier is according to described filtered
Signal and first reference signal, utilize formulaGenerate In-phase output signal Vx, wherein, A1For filtering
Signal afterwardsAmplitude,For the phase of measured signal, A2For first reference signal and institute
The amplitude in the second reference signal is stated, first reference signal is：Second reference signal is：
Step 504：Second lock-in amplifier generates positive blending output signal.Second lock-in amplifier is according to described filtered
Signal and second reference signal, utilize formulaGenerate positive blending output signal Vy。
Step 505：Amplitude phase detection module obtains the amplitude and phase of measured signal.The amplitude phase detection module
According to the In-phase output signal and the positive blending output signal, formula is utilizedObtain the width of measured signal
Value A, wherein G are the gain factor of signal conditioning circuit；Utilize formulaObtain the phase of measured signal
The present invention changes first with sef-adapting filter real time dynamic tracing input signal, filters out part interference；It is orthogonal
Derived reference signal produces two-way and is multiplied with frequency orthogonal reference signal through double-locking amplifier with sef-adapting filter output signal, and
Obtain including the DC component with signal amplitude and phase information after low-pass filtered, eventually through amplitude phase detection module
Extraction and reproduction useful signal.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Specific case used herein is set forth to the principle and embodiment of the present invention, and above example is said
It is bright to be only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, in specific embodiments and applications there will be changes.In summary, this specification content is not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of signal supervisory instrument, it is characterised in that described device includes：It is signal conditioning circuit, sef-adapting filter, orthogonal
Derived reference signal, lock-in amplifier, amplitude phase detection module；The lock-in amplifier includes the first lock-in amplifier and second
Lock-in amplifier；
The input of the signal conditioning circuit receives measured signal, and the output end connection of the signal conditioning circuit is described adaptive
Answer the signal input part of wave filter；
The output end of the sef-adapting filter connects the first input end and described second of first lock-in amplifier simultaneously
The first input end of lock-in amplifier, the sef-adapting filter are used to simultaneously pass the output signal of the sef-adapting filter
Transport to first lock-in amplifier and second lock-in amplifier；
Second input of first lock-in amplifier receives the first reference signal that the orthogonal reference signal source is sent；Institute
The second input for stating the second lock-in amplifier receives the second reference signal that the orthogonal reference signal source is sent, and described second
Reference signal is with frequency orthogonal signalling with first reference signal；
The amplitude phase detection module receives the output signal of first lock-in amplifier and second lock-in amplifier
Output signal, the amplitude phase detection module be used for according to the output signal of first lock-in amplifier and described second
The amplitude and phase of the output signal output measured signal of lock-in amplifier.
2. device according to claim 1, it is characterised in that the signal conditioning circuit specifically includes：Input buffering mould
Block, one-level adjustable gain amplification module, two level adjustable gain amplification module, buffering isolation module and fixed gain amplification module；
It is described input buffer module input receive measured signal, it is described input buffer module output end output signal according to
It is secondary to pass through the one-level adjustable gain amplification module, the two level adjustable gain amplification module, the buffering isolation module and institute
Fixed gain amplification module is stated, the output end of the fixed gain amplification module connects the sef-adapting filter；
The input buffer module includes first operational amplifier and resistance；
The one-level adjustable gain amplification module includes second operational amplifier, electric capacity and inductance；
The two level adjustable gain amplification module includes the second operational amplifier, electric capacity and the inductance；
The buffering isolation module includes first operational amplifier and resistance；
The fixed gain amplification module includes two the 3rd operational amplifiers and resistance.
3. device according to claim 2, it is characterised in that the model OPA842 of first operational amplifier, institute
State the model AD603, the model AD811 of the 3rd operational amplifier of the second operational amplifier.
4. device according to claim 1, it is characterised in that the sef-adapting filter specifically includes：Shaping circuit, survey
Frequency circuit, FPGA module, frequency dividing circuit, F/V change-over circuits, program-controlled voltage amplifying circuit and voltage controlled filter；
The shaping circuit receives the signal of the signal conditioning circuit output, for extracting the fundamental wave of signal and changing rectangular
Ripple；
The frequency measurement circuit transmits the signal that the shaping circuit exports to the FPGA module, and the FPGA module is used to survey
Measure the fundamental frequency of the output signal of the frequency measurement circuit；
The input of the FPGA module connects the output end of the frequency measurement circuit, described in the output end connection of the FPGA module
Frequency dividing circuit, the program-controlled voltage amplifying circuit and the voltage controlled filter；
The frequency dividing circuit receives the signal of the shaping circuit output, and electricity is changed for signal frequency to be divided to the F/V
In the bandwidth range on road；
The F/V change-over circuits receive the signal of the frequency dividing circuit output, for being voltage by fundamental frequency signal frequency conversion；
The input of the program-controlled voltage amplifying circuit receives the signal of the F/V change-over circuits output, for according to the F/V
The control voltage of voltage controlled filter described in the voltage output of change-over circuit output；
What the signal and the program-controlled voltage amplifying circuit of the voltage controlled filter reception signal conditioning circuit output exported
Control voltage, for being filtered to signal.
5. device according to claim 1, it is characterised in that first lock-in amplifier specifically includes：It is multiplier, low
Bandpass filter circuit and amplifying circuit；
The chip model that the multiplier uses is AD835；
The low-pass filter circuit includes MAX296 chips；
The amplifying circuit includes OP07 chips and resistance.
6. a kind of signal detecting method, it is characterised in that methods described includes：
Measured signal is amplified using the signal conditioning circuit in signal supervisory instrument, the signal after generation amplification；The signal
Detection means includes：Signal conditioning circuit, sef-adapting filter, orthogonal reference signal source, lock-in amplifier, amplitude phase detection
Module；The lock-in amplifier includes the first lock-in amplifier and the second lock-in amplifier；The input of the signal conditioning circuit
End receives measured signal, and the output end of the signal conditioning circuit connects the signal input part of the sef-adapting filter；It is described
The output end of sef-adapting filter connects the first input end of first lock-in amplifier and the second locking amplification simultaneously
The first input end of device；Second input of first lock-in amplifier receives first that the orthogonal reference signal source is sent
Reference signal；Second input of second lock-in amplifier receives the second reference letter that the orthogonal reference signal source is sent
Number, second reference signal is with frequency orthogonal signalling with first reference signal；The amplitude phase detection module receives
The output signal of the output signal of first lock-in amplifier and second lock-in amplifier, export the amplitude of measured signal
And phase；
The high fdrequency component in the signal after the amplification is filtered out using the sef-adapting filter, generates filtered signal；
First lock-in amplifier generates In-phase output signal according to the filtered signal and first reference signal；
Second lock-in amplifier generates positive blending output signal according to the filtered signal and second reference signal；
The amplitude phase detection module obtains measured signal according to the In-phase output signal and the positive blending output signal
Amplitude and phase.
7. according to the method for claim 6, it is characterised in that first lock-in amplifier is according to the filtered letter
Number and first reference signal generation In-phase output signal, specifically include：
Utilize formulaGenerate In-phase output signal Vx, wherein, A1For filtered signalAmplitude,For the phase of measured signal, A2For first reference signal and second reference
The amplitude of signal, first reference signal are：Vref=A2Sin ω t, second reference signal are：Vref 90°=A2cosω
t；
Second lock-in amplifier generates positive blending output signal according to the filtered signal and second reference signal,
Specifically include：Utilize formulaGenerate positive blending output signal Vy。
8. according to the method for claim 7, it is characterised in that the amplitude phase detection module is according to described with mutually output
Signal and the positive blending output signal obtain the amplitude and phase of measured signal, specifically include：
Utilize formulaThe amplitude A of measured signal is obtained, wherein G is the gain factor of signal conditioning circuit；
Utilize formulaObtain the phase of measured signal
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| CN113031075A (en) * | 2019-12-25 | 2021-06-25 | 圣邦微电子（北京）股份有限公司 | Detection circuit and detection method based on wireless charging |
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