CN106597366B - A kind of signal processing system of photodetector - Google Patents
A kind of signal processing system of photodetector Download PDFInfo
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- CN106597366B CN106597366B CN201611049483.XA CN201611049483A CN106597366B CN 106597366 B CN106597366 B CN 106597366B CN 201611049483 A CN201611049483 A CN 201611049483A CN 106597366 B CN106597366 B CN 106597366B
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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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
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Abstract
The invention discloses a kind of signal processing systems of photodetector, the current pulse signal of photodetector output is converted into voltage pulse signal by pre-amplifying module, Distinct matrix module receives voltage pulse signal and extracts amplification, peak value hold module postpones the signal peak retention time that Distinct matrix module exports, the signal that A/D converter exports peak value hold module samples, processor receives the parallel port of A/D converter output and controls signal and carry out target angle value resolving, calculated result is sent to central control computer by transceiver by processor.The present invention is considered by comprehensive design, it can be used for the rear class signal processing circuit of APD photodetector, also can be as the rear class signal processing circuit of PIN photoelectric detector, while the detection accuracy of slave laser target detection system can also be improved, and can effectively control research and development cost.
Description
Technical field
The invention belongs to laser eyepiece detection and control fields, and in particular to a kind of signal processing system of photodetector
System, the rear class signal processing circuit of the photodetectors such as PIN, APD suitable for laser eyepiece detection system.
Background technique
In laser eyepiece detection system, four-quadrant photo detector detection target bearing is generallyd use.When target occurs
When offset, due to the variation of radiation flux between quadrant, cause the photocurrent variations of each quadrant output, 4 quadrant detector output
Pulse signal also have corresponding variation, pulse signal can obtain target angle resolving value after a series of processing.So
The processing of photosignal is most important, directly influences the detection accuracy of system.
Under normal circumstances, the integrated photodetector of the preamplifier with I/V conversion function is selected in type selecting,
Design preamplifier is not needed, is conducive to shorten the research and development of products time.But since integrated photodetector needs internal collection
At amplifier, control interface solidification is unfavorable for the flexibility of design, and packaging cost is higher, is also unfavorable for product development
It is cost effective.
Simultaneously as the responsiveness of APD photodetector is high more than PIN photoelectric detector, detection range is remote
It is more, under weak laser energy situation, there is larger difference in the pulse signal of output, therefore in rear class signal on the width
There is also differences on processing circuit.
Summary of the invention:
In order to overcome the defect of above-mentioned background technique, the present invention provides a kind of signal processing system of photodetector, energy
Enough improve the detection accuracy of slave laser target detection system.
In order to solve the above-mentioned technical problem used technical solution of the invention are as follows:
The current pulse signal of a kind of signal processing system of photodetector, photodetector output passes through preposition amplification
Module is converted into voltage pulse signal, and Distinct matrix module receives voltage pulse signal and extracts amplification, peak holding
Module postpones the signal peak retention time that Distinct matrix module exports, and A/D converter is to peak value hold module
The signal of output is sampled, and processor receives the parallel port of A/D converter output and controls signal and carry out target angle value solution
It calculates, calculated result is sent to central control computer by transceiver by processor.
It is protected preferably, the signal of Distinct matrix module output is delivered to peak value after the amplification of the first buffer amplifier
Module is held, peak value hold module is additionally provided with the second buffer amplifier between A/D converter.
Preferably, the signal of Distinct matrix module output is also delivered to synchronization after the amplification of the first buffer amplifier
Trigger signal generation module, synchronous triggering signal generation module generates synchronous triggering signal and is delivered to processor, for A/D
The sampling of converter is controlled, and carries out identification of code type.
Preferably, the Serial Peripheral Interface (SPI) of processor is connected with the signal input part of D/A converter, D/A converter difference
Gain-controlled voltage and reference voltage are provided to Distinct matrix module and synchronous triggering signal generation module.
Preferably, D/A converter output controls voltage to linear adjustable high voltage power supply module, linear adjustable high voltage power supply mould
Block exports bias voltage control signal to photodetector.
Preferably, photodetector includes APD photodetector and PIN photoelectric detector.
Preferably, pre-amplifying module includes photodiode amplifier OPA656, photodiode amplifier OPA656
Voltage input negative pole end pass through the output end of capacitor C1 connection photodetector, the voltage of photodiode amplifier OPA656
For output end for connecting Distinct matrix module, the voltage input negative pole end and voltage of photodiode amplifier OPA656 is defeated
Feedback control loop is equipped between outlet, feedback control loop includes resistance R2 and capacitor C2 in parallel；The output end of photodetector connects
One end of resistance R1, resistance R1 other end ground connection, pre-amplifying module pass through the electric current arteries and veins that resistance R1 exports photodetector
It rushes signal and is converted into voltage pulse signal.
Preferably, Distinct matrix module includes variable gain amplifier AD8336, variable gain amplifier AD8336
Signal input part INPN the signal output end of pre-amplifying module is connected with the control terminal Vp of variable gain amplifier AD8336,
The signal output end of variable gain amplifier AD8336 is for connecting peak value hold module；Distinct matrix module further includes connecting
It is connected to the amplification factor configuration circuit and filter circuit of variable gain amplifier AD8336.
Preferably, peak value hold module includes exporting for receiving the first buffer amplifier or Distinct matrix module
The output end of the trans-impedance amplifier D of Vin voltage pulse signal, trans-impedance amplifier D output voltage Vout are used to connect sample circuit,
Trans-impedance amplifier D amplifies the pressure difference between voltage pulse signal Vin and output voltage Vout, trans-impedance amplifier D output
Electric current charged by Schottky diode Z to holding capacitor C4；The anode and cathode of Schottky diode Z is separately connected
The current output terminal C and buffer inputs IN of trans-impedance amplifier D.
Preferably, the cathode of Schottky diode Z also passes through retention time control circuit connection controller, retention time control
Circuit processed includes high speed switch tube Q and holding capacitor C4, and one end of the cathode connection holding capacitor C4 of Schottky diode Z is protected
Hold the other end ground connection of capacitor C4；The collector of high speed switch tube Q passes through resistance R8 connection holding capacitor C4, high speed switch tube Q
Base stage by resistance R5 connection controller receive control signal Discharge, high speed switch tube Q emitter ground connection, at a high speed
Resistance R7 is additionally provided between the base stage and emitter of switching tube.
The beneficial effects of the present invention are: after photodetector receives laser energy, current pulse signal is exported, in order to
It first has to carry out I/V conversion by pre-amplifying module convenient for rear class processing, current pulse signal is become into voltage pulse signal；
Since the dynamic range of voltage pulse signal is theoretically up to 70dB, when the laser energy that photodetector receives is very faint
When, obtained voltage pulse signal meeting very little, or even be submerged among noise, just need Distinct matrix module to electricity at this time
Pressure pulse signal extracts amplification, and handles by peak value hold module, is then fed into A/D converter and carries out efficiently sampling；
For photodetector under faint energy output pulse signal narrower width, and slave laser target detection system is due to watching
Motor driven is taken there are noise jamming, the peak value hold module of pulse signal can make peak holding time delay to tens of us,
It is handled convenient for continuous sampling and data software filtering algorithm, is conducive to improve detection accuracy；Peak value hold module output
Signal is sent directly into synchronized sampling A/D converter and carries out monocycle multiple continuous sampling, be used for after the second buffer amplifier
Target angle angle value resolves；Voltage pulse signal is after Distinct matrix module and the first buffer amplifier, into synchronization
Trigger signal generation module generates synchronous triggering signal and is sent into dsp processor external interrupt, is used for A/D controlling of sampling and code
Type identification；Obtained target angle resolving value is finally sent to central control computer by CAN communication.It is linear adjustable by controlling
High-voltage power module controls the responsiveness of photodetector, and cooperation Distinct matrix module completes the gain control of whole system
System.The present invention is directed to APD photodetector output pulse signal narrower width under faint energy, and slave laser target is visited
Examining system due to servo motor drive and there are noise jammings, design a kind of peak value hold module of pulse signal, peak value can be made
Retention time is deferred to tens of us, handles convenient for continuous sampling and data software filtering algorithm, and target seeker can be made to measure mesh
Mark orientation or the stability of pitch angle are greatly improved with accuracy, are conducive to improve detection accuracy.It is set by synthesis
Meter considers, can be used for the rear class signal processing circuit of APD photodetector, can also believe as the rear class of PIN photoelectric detector
Number processing circuit, while the detection accuracy of slave laser target detection system can also be improved, and can effectively control research and development
Cost.
Detailed description of the invention
Fig. 1 is the system global structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the circuit structure diagram of pre-amplifying module of the invention；
Fig. 3 is the circuit structure diagram of Distinct matrix module of the invention；
Fig. 4 is the circuit structure diagram of peak value hold module of the invention.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
The current pulse signal of a kind of signal processing system of photodetector, photodetector output passes through preposition amplification
Module is converted into voltage pulse signal, and Distinct matrix module receives voltage pulse signal and extracts amplification, variable gain
The signal of control module output is delivered to peak value hold module, peak value hold module docking after the amplification of the first buffer amplifier
The signal peak retention time for receiving voltage pulse signal is postponed, and A/D converter amplifies it to through the second buffer amplifier
The signal of peak value hold module output afterwards is sampled, and processor receives the parallel port of A/D converter output and controls signal simultaneously
The resolving of target angle angle value is carried out, calculated result is sent to central control computer by transceiver by processor.
The signal of Distinct matrix module output is also delivered to synchronous triggering letter after the amplification of the first buffer amplifier
Number generation module, synchronous triggering signal generation module generate synchronous triggering signal and are simultaneously delivered to processor, for A/D converter
Sampling controlled, and carry out identification of code type.
The Serial Peripheral Interface (SPI) of processor is connected with the signal input part of D/A converter, and D/A converter is respectively to variable increasing
Beneficial control module and synchronous triggering signal generation module provide gain-controlled voltage and reference voltage.
D/A converter output controls voltage to linear adjustable high voltage power supply module, linear adjustable high voltage power supply module output
Bias voltage control signal is to photodetector.
In the present embodiment, pre-amplifying module includes photodiode amplifier OPA656, photodiode amplifier
The voltage input negative pole end of OPA656 passes through the output end of capacitor C1 connection photodetector, photodiode amplifier OPA656
Voltage output end for connecting Distinct matrix module, the voltage input negative pole end of photodiode amplifier OPA656
Feedback control loop is equipped between AXI and voltage output end AX, feedback control loop includes resistance R2 and capacitor C2 in parallel；Photodetector
Output end connection resistance R1 one end, resistance R1 other end ground connection, pre-amplifying module is by resistance R1 by photodetector
The current pulse signal of output is converted into voltage pulse signal.Pre-amplifying module is mainly with the photoelectricity of low noise wide dynamic range
Diode amplifier OPA656 is core, as shown in Fig. 2, it passes through the current pulse signal that resistance R1 exports photodetector
It is converted into voltage pulse signal, in order to rear class processing.
Distinct matrix module includes variable gain amplifier AD8336, and the signal of variable gain amplifier AD8336 is defeated
Enter to hold INPN to connect the signal output end of pre-amplifying module, variable gain with the control terminal Vp of variable gain amplifier AD8336
The signal output end of amplifier AD8336 is for connecting peak value hold module；Distinct matrix module further include be connected to it is variable
The amplification factor configuration circuit and filter circuit of gain amplifier AD8336.The present embodiment Distinct matrix module is mainly with height
The variable gain amplifier AD8336 of dynamic range is core, and availability of dynamic range is -14dB~46dB, then is cooperated to photoelectricity
Detector bias voltage control is fully able to the pulse signal that control dynamic range is 70dB.Fig. 3 show variable gain of the invention
The signal of control module schematic diagram, voltage output end and variable gain AD8336 that AX is photodiode amplifier OPA656 is defeated
Enter end, AOUT is the output end of variable gain AD8336, its gain is controlled by gain-controlled voltage Vp and Vn, is wanted
Voltage pulse signal.
Peak value hold module is mainly by trans-impedance amplifier, Schottky diode, the holding capacitor of low ESR and high-speed switch
The elements such as pipe composition.Specifically peak value hold module includes for receiving the first buffer amplifier or Distinct matrix module
The output end of the trans-impedance amplifier D of the Vin voltage pulse signal of output, trans-impedance amplifier D output voltage Vout are adopted for connecting
Sample circuit, trans-impedance amplifier D amplify the pressure difference between voltage pulse signal Vin and output voltage Vout, amplify across resistance
The electric current of device D output charges to holding capacitor C4 by Schottky diode Z；The anode and cathode of Schottky diode Z
It is separately connected the current output terminal C and its buffer inputs IN of trans-impedance amplifier D.The cathode of Schottky diode Z also passes through guarantor
Time control circuit connection controller is held, retention time control circuit includes high speed switch tube Q and holding capacitor C4, Schottky two
One end of the cathode connection holding capacitor C4 of pole pipe Z, the other end ground connection of holding capacitor C4；The collector of high speed switch tube Q is logical
The base stage for crossing resistance R8 connection holding capacitor C4, high speed switch tube Q receives control signal by resistance R5 connection controller
The emitter of Discharge, high speed switch tube Q are grounded, and are additionally provided with resistance R7 between the base stage and emitter of high speed switch tube.Across
For the signal receiving end B of impedance amplifier D for receiving voltage pulse signal Vin, signal receiving end B is connected with high-pass filtering circuit.
High-pass filtering circuit includes capacitor C3 and resistance R5.The voltage output end OUT of trans-impedance amplifier D is used for output voltage signal
Vout, voltage output end OUT connect to form feedback loop with reverse input end E.The quiescent current adjustment end of trans-impedance amplifier D
IQAdj passes through bandwidth control circuit connection -5V power supply negative pole end.Bandwidth control circuit includes band width configuration resistance R9.
The pin V- for being connected to -5V power supply negative input of trans-impedance amplifier D is also connected with capacitor C5, puts across resistance
The pin V+ for being connected to+5V power supply electrode input end of big device D is also connected with capacitor C6.The capacitor of capacitor C5 and capacitor C6
Value is 0.01uF.
Voltage pulse signal Vin is sent into trans-impedance amplifier after capacitor C3 and resistance R5 high-pass filtering blocking, puts across resistance
Big device amplifies the voltage difference between input voltage and output voltage, and the current signal of output is through overcurrent output pin
IN is holding capacitor C4 charging, and one end that holding capacitor C4 is connected to electric current output pin IN passes through Xiao Te Schottky diode Z
Voltage end is connected with resistance R6；When output voltage is less than input voltage, then the current signal of trans-impedance amplifier output passes through Xiao Te
Based diode Z charges to holding capacitor C4, if output voltage is greater than input voltage, Schottky diode Z is not turned on, and keeps electricity
The voltage held on C4 remains unchanged, and keeps voltage pulse signal peak value.Fig. 4 is peak value hold module schematic diagram of the invention: electricity
The pressure peak value of pulse retention time is controlled by holding capacitor C4 and high speed switch tube Q1, increases holding capacitor capacitance, is conducive to increase
Add peak holding duration, but be difficult to reach original peak height because the voltage pulse charging time is shorter, peak value exists certain
Landing；On the contrary, reducing holding capacitor value, conducive to the precision of peak holding, but holding duration can be reduced；Therefore it needs to choose to close
Suitable holding capacitor value.Peak value hold module further includes retention time control circuit, and retention time control circuit includes keeping electricity
Hold C4 and high speed switch tube Q, the collector of high speed switch tube Q passes through the electric current output pin of resistance R8 connection trans-impedance amplifier
IN, base stage pass through the output end of resistance R5 connection processor, emitter ground connection.The function of high speed switch tube Q is accurate control peak
The value retention time simultaneously realizes peak value repid discharge.The voltage pulse signal arrival moment can generate synchronous trigger pulse and be sent at DSP
Device is managed, dsp processor controls the peak holding time by one Discharge control signal of timer timing output, when
When Discharge is high level, high speed switch tube Q conducting, holding capacitor C4 is discharged by R8, is guaranteed in next voltage pulse
The previous peaks of period arrival can discharge completion.The model BT2222 of the present embodiment high speed switching tube Q, Schottky diode
The model BAR18 of Z.
Photodetector of the present invention includes APD photodetector or PIN photoelectric detector, when APD or PIN photoelectricity
After detector receives laser energy, current pulse signal is exported, is first had to for the ease of rear class processing through preposition amplification mould
Block carries out I/V conversion, and current pulse signal is become voltage pulse signal；Due to voltage pulse signal dynamic range theoretically
Up to 70dB, when the laser energy that photodetector receives is very faint, obtained voltage pulse signal meeting very little, or even flood
Not among noise, Distinct matrix module is just needed to extract amplification to voltage pulse signal at this time, and pass through peak value
Resume module is kept, A/D converter is then fed into and carries out efficiently sampling；It is exported under faint energy for APD photodetector
Pulse signal width is relatively narrow, and slave laser target detection system due to servo motor drives and there are noise jamming, design
A kind of peak value hold module of pulse signal can make peak holding time delay to tens of us, be convenient for continuous sampling and data
Software filtering algorithm process is conducive to improve detection accuracy；The signal of peak value hold module output passes through the second Hyblid Buffer Amplifier
After device, it is sent directly into synchronized sampling A/D converter and carries out monocycle multiple continuous sampling, resolved for target angle angle value；Voltage
Pulse signal, into synchronous triggering signal generation module, is produced after Distinct matrix module and the first buffer amplifier
Raw synchronous triggering signal is sent into dsp processor external interrupt, is used for A/D controlling of sampling and identification of code type；It will finally obtain
Target angle resolving value is sent to central control computer by CAN communication.In addition, D/A converter is respectively Distinct matrix mould
Block, synchronous triggering signal generation module and linear adjustable high voltage power supply module provide gain-controlled voltage, reference voltage and control
Voltage processed.And the responsiveness of photodetector is controlled by controlling linear adjustable high voltage power supply module, cooperate variable gain control
Molding block completes the gain control of whole system.
For APD photodetector under faint energy output pulse signal narrower width, and slave laser target visit
Examining system due to servo motor drive and there are noise jammings, design a kind of peak value hold module of pulse signal, peak value can be made
Retention time is deferred to tens of us, handles convenient for continuous sampling and data software filtering algorithm, and target seeker can be made to measure mesh
Mark orientation or the stability of pitch angle are greatly improved with accuracy, are conducive to improve detection accuracy.Peak holding mould
Block is mainly made of elements such as trans-impedance amplifier, Schottky diode, the holding capacitor of low ESR and high speed switch tubes.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. the current pulse signal of a kind of signal processing system of photodetector, photodetector output passes through preposition amplification mould
Block is converted into voltage pulse signal, it is characterised in that: Distinct matrix module receives the voltage pulse signal and extracts
Postponed after amplification by the signal peak retention time that peak value hold module exports the Distinct matrix module, then
The signal that A/D converter exports the peak value hold module samples, processor receive A/D converter output and
Mouthful and control signal and carry out target angle value resolving, calculated result is sent to middle control calculating by transceiver by the processor
Machine；
The signal of the Distinct matrix module output is also delivered to synchronous triggering letter after the amplification of the first buffer amplifier
Number generation module, the synchronous triggering signal generation module generate synchronous triggering signal and are simultaneously delivered to the processor, for pair
The sampling of A/D converter is controlled, and carries out identification of code type.
2. a kind of signal processing system of photodetector according to claim 1, it is characterised in that: the variable gain
The signal of control module output is delivered to the peak value hold module, the peak holding after the amplification of the first buffer amplifier
Module is additionally provided with the second buffer amplifier between the A/D converter.
3. a kind of signal processing system of photodetector according to claim 1, it is characterised in that: the processor
Serial Peripheral Interface (SPI) is connected with the signal input part of D/A converter, the D/A converter respectively to Distinct matrix module and
Synchronous triggering signal generation module provides gain-controlled voltage and reference voltage.
4. a kind of signal processing system of photodetector according to claim 3, it is characterised in that: the D/A conversion
Device output controls voltage to linear adjustable high voltage power supply module, and the linear adjustable high voltage power supply module exports bias voltage control signal
To the photodetector.
5. a kind of signal processing system of photodetector according to claim 1, it is characterised in that: the photodetection
Device includes APD photodetector and PIN photoelectric detector.
6. a kind of signal processing system of photodetector according to claim 1, it is characterised in that: the preposition amplification
Module includes photodiode amplifier OPA656, and the voltage input negative pole end of the photodiode amplifier OPA656 passes through
The output end of capacitor C1 connection photodetector, the voltage output end of the photodiode amplifier OPA656 is for connecting institute
Distinct matrix module is stated, between the voltage input negative pole end and voltage output end of the photodiode amplifier OPA656
Equipped with feedback control loop, the feedback control loop includes resistance R2 and capacitor C2 in parallel；The output end of the photodetector connects
One end of resistance R1, the resistance R1 other end ground connection, the pre-amplifying module are visited the photoelectricity by the resistance R1
The current pulse signal for surveying device output is converted into voltage pulse signal.
7. a kind of signal processing system of photodetector according to claim 1, it is characterised in that: the variable gain
Control module includes variable gain amplifier AD8336, the signal input part INPN of the variable gain amplifier AD8336 and institute
The control terminal Vp for stating variable gain amplifier AD8336 connects the signal output end of the pre-amplifying module, the variable gain
The signal output end of amplifier AD8336 is for connecting the peak value hold module；The Distinct matrix module further includes connecting
It is connected to the amplification factor configuration circuit and filter circuit of the variable gain amplifier AD8336.
8. a kind of signal processing system of photodetector according to claim 2, it is characterised in that: the peak holding
Module include for receive first buffer amplifier or Distinct matrix module output Vin voltage pulse signal across
The output end of impedance amplifier D, the trans-impedance amplifier D output voltage Vout are for connecting sample circuit, the trans-impedance amplifier D
Pressure difference between voltage pulse signal Vin and output voltage Vout is amplified, the electric current of the trans-impedance amplifier D output is logical
Schottky diode Z is crossed to charge to holding capacitor C4；The anode and cathode of the Schottky diode Z is separately connected described
The current output terminal C and buffer inputs IN of trans-impedance amplifier D.
9. a kind of signal processing system of photodetector according to claim 8, it is characterised in that: the Schottky two
The cathode of pole pipe Z also passes through retention time control circuit connection controller, and the retention time control circuit includes high-speed switch
The pipe Q and holding capacitor C4, the cathode of the Schottky diode Z connect one end of the holding capacitor C4, the holding
The other end of capacitor C4 is grounded；The collector of the high speed switch tube Q passes through the resistance R8 connection holding capacitor C4, the height
The base stage of fast switching tube Q receives control signal Discharge, the high speed switch tube Q by the resistance R5 connection controller
Emitter ground connection, be additionally provided with resistance R7 between the base stage and emitter of the high speed switch tube.
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