CN106597366A - Signal processing system for photoelectric detector - Google Patents
Signal processing system for photoelectric detector Download PDFInfo
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- CN106597366A CN106597366A CN201611049483.XA CN201611049483A CN106597366A CN 106597366 A CN106597366 A CN 106597366A CN 201611049483 A CN201611049483 A CN 201611049483A CN 106597366 A CN106597366 A CN 106597366A
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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
- G01S5/0205—Details
- G01S5/0215—Interference
Abstract
The invention discloses a signal processing system for a photoelectric detector. A current pulse signal outputted by the photoelectric detector is converted into a voltage pulse signal through a pre-amplification module; a variable gain control module is used for receiving the voltage pulse signal, extracting and amplifying; a peak holding module is used for delaying the signal peak holding time outputted by the variable gain control module; an A/D converter is used for sampling the signal outputted by the peak holding module; a processor is used for receiving the parallel port and control signals outputted by the A/D converter and resolving a target angle value; the processor is used for sending a calculating result to a central control computer through a receiver. Through comprehensive design consideration, the signal processing system for the photoelectric detector not only can be applied to a post-signal processing circuit of an APD photoelectric detector but also can be used as the post-signal processing circuit of a PIN photoelectric detector, is capable of increasing the detection precision of a servo laser target detection system and is capable of effectively controlling the research and development cost.
Description
Technical field
The invention belongs to laser eyepiece detection and control field, and in particular to a kind of signal processing system of photodetector
System, it is adaptable to the rear class signal processing circuit of the photodetector such as PIN, APD in laser eyepiece detection system.
Background technology
In laser eyepiece detection system, generally target bearing is detected using four-quadrant photo detector.When target occurs
During skew, due to the change of radiant flux between quadrant, cause the photocurrent variations of each quadrant output, 4 quadrant detector output
Pulse signal also have corresponding change, pulse signal can obtain angle on target resolving value after a series of process.So,
The process of photosignal is most important, directly influences the detection accuracy of system.
Generally, the integrated photodetector of the preamplifier with I/V translation functions is selected in type selecting, its
Preamplifier need not be designed, is conducive to shortening the research and development of products time.But, because integrated photodetector needs internal collection
Into amplifier, control interface solidification, it is unfavorable for the motility for designing, and packaging cost is higher, is also unfavorable for product development
Cost degradation.
Simultaneously as the responsiveness of APD photodetectors is high more than PIN photoelectric detector, detection range is remote
It is many, under weak laser energy situation, there is larger difference in the pulse signal of output on width for it, therefore in rear class signal
Difference is there is also on process circuit.
The content of the invention：
In order to overcome the defect of above-mentioned background technology, the present invention to provide a kind of signal processing system of photodetector, energy
Enough improve the detection accuracy of slave laser target detection system.
In order to solve above-mentioned technical problem the present invention the technical scheme for being adopted for：
A kind of signal processing system of photodetector, the current pulse signal of photodetector output is by preposition amplification
Module is converted into voltage pulse signal, and Distinct matrix module receiving voltage pulse signal carries out extraction amplification, peak holding
Module postpones to the signal peak retention time that Distinct matrix module is exported, 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 control signal and carries out angle on target value solution
Calculate, processor sends result of calculation to central control computer by transceiver.
It is preferred that the buffer amplifiers of signal Jing first of Distinct matrix module output are delivered to peak value guarantor after amplifying
Module is held, peak value hold module is additionally provided with the second buffer amplifier between A/D converter.
It is preferred that the buffer amplifiers of signal Jing first of Distinct matrix module output are also delivered to synchronization after amplifying
Trigger generation module, synchronous triggering signal generation module produces synchronous triggering signal and is delivered to processor, for A/D
The sampling of transducer is controlled, and carries out identification of code type.
It is preferred that 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.
It is preferred that D/A converter output control voltage is to linear adjustable high voltage power supply module, linear adjustable high voltage power supply mould
Block exports bias voltage control signal to photodetector.
It is preferred that photodetector includes APD photodetectors and PIN photoelectric detector.
It is preferred that pre-amplifying module includes photodiode amplifier OPA656, photodiode amplifier OPA656
Control source negative pole end by electric capacity C1 connect photodetector outfan, the voltage of photodiode amplifier OPA656
Outfan is used to connect Distinct matrix module, and the control source negative pole end of photodiode amplifier OPA656 is defeated with voltage
Go out between end and be provided with feedback control loop, feedback control loop includes resistance R2 and electric capacity C2 in parallel；The outfan connection of photodetector
One end of resistance R1, resistance R1 other ends ground connection, the electric current arteries and veins that pre-amplifying module is exported photodetector by resistance R1
Rush signal and be converted into voltage pulse signal.
It is preferred that Distinct matrix module includes variable gain amplifier AD8336, variable gain amplifier AD8336
Signal input part INPN and variable gain amplifier AD8336 control end Vp connect pre-amplifying module signal output part,
The signal output part of variable gain amplifier AD8336 is used to connect peak value hold module；Distinct matrix module also includes connecting
It is connected to the amplification configuration circuit and filter circuit of variable gain amplifier AD8336.
It is preferred that peak value hold module includes what is exported for the first buffer amplifier of reception or Distinct matrix module
The outfan of the trans-impedance amplifier D of Vin voltage pulse signals, trans-impedance amplifier D output voltage Vout is used to connect sample circuit,
Trans-impedance amplifier D is amplified to the pressure reduction between voltage pulse signal Vin and output voltage Vout, trans-impedance amplifier D outputs
Electric current holding capacitor C4 is charged by Schottky diode Z；The anode and negative electrode of Schottky diode Z connects respectively
The current output terminal C and buffer inputs IN of trans-impedance amplifier D.
It is preferred that the negative electrode of Schottky diode Z also connects controller, retention time control by retention time control circuit
Circuit processed includes high speed switch tube Q and holding capacitor C4, and the negative electrode of Schottky diode Z connects one end of holding capacitor C4, protects
Hold the other end ground connection of electric capacity C4；The colelctor electrode of high speed switch tube Q connects holding capacitor C4, high speed switch tube Q by resistance R8
Base stage controller connected by resistance R5 receive control signal Discharge, the grounded emitter of high speed switch tube Q, at a high speed
Resistance R7 is additionally provided between the base stage and emitter stage of switching tube.
The beneficial effects of the present invention is：Photodetector is received after laser energy, output current pulse signal, in order to
It is easy to rear class to process to first have to carry out I/V conversions by pre-amplifying module, current pulse signal is become into voltage pulse signal；
Due to voltage pulse signal dynamic range in theory be up to 70dB, when the laser energy that photodetector is received it is very faint
When, the voltage pulse signal meeting very little for obtaining, or even be submerged among noise, Distinct matrix module is now accomplished by electricity
Pressure pulse signal carries out extraction amplification, and through peak value hold module process, being then fed into A/D converter carries out efficiently sampling；
For photodetector under faint energy output pulse signal narrower width, and slave laser target detection system is due to watching
Take Motor drive and there is noise jamming, the peak value hold module of pulse signal can make peak holding time delay to tens of us,
It is easy to continuous sampling and data software filtering algorithm to process, is conducive to improving detection accuracy；Peak value hold module output
After the second buffer amplifier, be sent directly into synchronized sampling A/D converter carries out monocycle multiple continuous sampling to signal, is used for
Target angle angle value is resolved；Voltage pulse signal after Distinct matrix module and the first buffer amplifier, into synchronization
Trigger generation module, produces synchronous triggering signal and sends into dsp processor external interrupt, for A/D controlling of sampling and code
Type is recognized；Finally the angle on target resolving value for obtaining is sent to into central control computer by CAN communication.It is linear adjustable by control
High-voltage power module coordinates Distinct matrix module to complete the gain control of whole system controlling the responsiveness of photodetector
System.The present invention is directed to APD photodetectors output pulse signal narrower width under faint energy, and slave laser target is visited
There is noise jamming in examining system, design a kind of peak value hold module of pulse signal because servomotor drives, and can make peak value
Retention time is deferred to tens of us, is easy to continuous sampling and data software filtering algorithm to process, and target seeker can be made to measure mesh
The stability of mark orientation or luffing angle is greatly improved with accuracy, is conducive to improving detection accuracy.Set by comprehensive
Meter consideration, can be used for the rear class signal processing circuit of APD photodetectors, also can believe as the rear class of PIN photoelectric detector
Number process circuit, while the detection accuracy of slave laser target detection system can also be improved, and being capable of effective control research and development
Cost.
Description of the drawings
Fig. 1 is the system global structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the circuit structure diagram of the pre-amplifying module of the present invention；
Fig. 3 is the circuit structure diagram of the Distinct matrix module of the present invention；
Fig. 4 is the circuit structure diagram of the peak value hold module of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described further.
A kind of signal processing system of photodetector, the current pulse signal of photodetector output is by preposition amplification
Module is converted into voltage pulse signal, and Distinct matrix module receiving voltage pulse signal carries out extraction amplification, variable gain
The buffer amplifiers of signal Jing first of control module output are delivered to peak value hold module, peak value hold module docking after amplifying
The signal peak retention time for receiving voltage pulse signal is postponed, and A/D converter amplifies it to the buffer amplifiers of Jing second
The signal of peak value hold module output afterwards is sampled, and the parallel port of processor reception A/D converter output and control signal are simultaneously
Target angle angle value resolving is carried out, processor sends result of calculation to central control computer by transceiver.
The buffer amplifiers of signal Jing first of Distinct matrix module output are also delivered to synchronous triggering letter after amplifying
Number generation module, synchronous triggering signal generation module produces synchronous triggering signal and is simultaneously delivered to processor, for A/D converter
Sampling be 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 control voltage is 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 control source negative pole end of OPA656 connects the outfan of photodetector, photodiode amplifier OPA656 by electric capacity C1
Voltage output end be used for connect Distinct matrix module, the control source negative pole end of photodiode amplifier OPA656
Feedback control loop is provided between AXI and voltage output end AX, feedback control loop includes resistance R2 and electric capacity C2 in parallel；Photodetector
Outfan connect one end of resistance R1, resistance R1 other ends 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
Voltage pulse signal is converted into, in order to rear class process.
Distinct matrix module includes variable gain amplifier AD8336, and the signal of variable gain amplifier AD8336 is defeated
Enter to hold the signal output part of the control end Vp connection pre-amplifying module of INPN and variable gain amplifier AD8336, variable gain
The signal output part of amplifier AD8336 is used to connect peak value hold module；Distinct matrix module is also variable including being connected to
The amplification configuration circuit of gain amplifier AD8336 and filter circuit.The present embodiment Distinct matrix module is mainly with height
The variable gain amplifier AD8336 of dynamic range is core, and its availability of dynamic range is -14dB～46dB, then is coordinated to photoelectricity
Detector bias voltage control, is fully able to control the pulse signal that dynamic range is 70dB.Fig. 3 show the variable gain of the present invention
Control module schematic diagram, AX is that the voltage output end of photodiode amplifier OPA656 and the signal of variable gain AD8336 are defeated
Enter end, AOUT is the outfan of variable gain AD8336, its gain is controlled by gain-controlled voltage Vp and Vn, wanted
Voltage pulse signal.
Peak value hold module is mainly by trans-impedance amplifier, Schottky diode, the holding capacitor of low ESR and speed-sensitive switch
The elements such as pipe are constituted.Specifically peak value hold module is included for receiving the first buffer amplifier or Distinct matrix module
The trans-impedance amplifier D of the Vin voltage pulse signals of output, the outfan of trans-impedance amplifier D output voltage Vout is adopted for connection
Sample circuit, trans-impedance amplifier D is amplified to the pressure reduction between voltage pulse signal Vin and output voltage Vout, amplifies across resistance
The electric current of device D outputs is charged by Schottky diode Z to holding capacitor C4；The anode and negative electrode of Schottky diode Z
Connect the current output terminal C and its buffer inputs IN of trans-impedance amplifier D respectively.The negative electrode of Schottky diode Z is also by protecting
Time control circuit connection controller is held, retention time control circuit includes high speed switch tube Q and holding capacitor C4, Schottky two
The negative electrode of pole pipe Z connects one end of holding capacitor C4, the other end ground connection of holding capacitor C4；The colelctor electrode of high speed switch tube Q leads to
Resistance R8 connection holding capacitors C4 are crossed, the base stage of high speed switch tube Q connects controller and receives control signal by resistance R5
Discharge, the grounded emitter of high speed switch tube Q is additionally provided with resistance R7 between the base stage and emitter stage of high speed switch tube.Across
The signal receiving end B of impedance amplifier D is used for receiving voltage pulse signal Vin, and signal receiving end B is connected with high-pass filtering circuit.
High-pass filtering circuit includes electric capacity 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 is connected to form feedback circuit with reverse input end E.The quiescent current adjustment end of trans-impedance amplifier D
IQAdj connects -5V power supply negative pole ends by bandwidth control circuit.Bandwidth control circuit includes band width configuration resistance R9.
The pin V- for being connected to -5V power supply negative inputs of trans-impedance amplifier D is also associated with electric capacity C5, puts across resistance
The pin V+ for being connected to+5V power supply electrode input ends of big device D is also associated with electric capacity C6.The electric capacity of electric capacity C5 and electric capacity C6
It is worth for 0.01uF.
Voltage pulse signal Vin sends into trans-impedance amplifier through electric capacity C3 and resistance R5 high-pass filterings after straight, puts across resistance
Big device is amplified to the voltage difference between input voltage and output voltage, and the current signal of its output is through electric current output pin
IN is the charging of holding capacitor C4, and holding capacitor C4 is connected to one end of electric current output pin IN and passes through Xiao Te Schottky diode Z
Connect voltage end 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 more 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 the peak value hold module schematic diagram of the present 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, beneficial to increasing
Plus peak holding duration, but because the potential pulse charging interval is shorter and is difficult to reach original peak height, peak value exists certain
Landing；Conversely, reducing holding capacitor value, beneficial to the precision of peak holding, but can reduce keeping duration；Therefore need to choose to close
Suitable holding capacitor value.Peak value hold module also includes retention time control circuit, and retention time control circuit includes keeping electricity
Hold C4 and high speed switch tube Q, the colelctor electrode of high speed switch tube Q connects the electric current output pin of trans-impedance amplifier by resistance R8
IN, base stage connects the outfan of processor, grounded emitter by resistance R5.The function of high speed switch tube Q is precise control peak
The value retention time simultaneously realizes peak value repid discharge.The voltage pulse signal arrival moment can produce synchronous trigger pulse and send at DSP
Reason device, dsp processor controls the peak holding time by one Discharge control signal of intervalometer timing output, when
When Discharge is high level, high speed switch tube Q conductings, holding capacitor C4 is discharged by R8, it is ensured that in next potential pulse
The previous peaks of cycle arrival can discharge and complete.Model BT2222 of the present embodiment high speed switching tube Q, Schottky diode
Model BAR18 of Z.
Photodetector of the present invention includes APD photodetectors or PIN photoelectric detector, when APD or PIN photoelectricity
Detector is received after laser energy, output current pulse signal, is first had to by preposition amplification mould for the ease of rear class process
Block carries out I/V conversions, and current pulse signal is become into voltage pulse signal；Due to voltage pulse signal dynamic range in theory
Up to 70dB, when the laser energy that photodetector is received is very faint, the voltage pulse signal meeting very little for obtaining, or even flood
Not among noise, be now accomplished by Distinct matrix module carries out extraction amplification to voltage pulse signal, and through peak value
Resume module is kept, being then fed into A/D converter carries out efficiently sampling；Export under faint energy for APD photodetectors
Pulse signal width is narrower, and slave laser target detection system has noise jamming because servomotor drives, and designs
A kind of peak value hold module of pulse signal, can make peak holding time delay to tens of us, be easy to continuous sampling and data
Software filtering algorithm process, is conducive to improving detection accuracy；The signal of peak value hold module output is through the second Hyblid Buffer Amplifier
After device, being sent directly into synchronized sampling A/D converter carries out monocycle multiple continuous sampling, for the resolving of 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 sends into dsp processor external interrupt, for A/D controlling of sampling and identification of code type；Finally will obtain
Angle on target resolving value is sent to central control computer by CAN communication.Additionally, 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, coordinate variable gain control
Molding block completes the gain control of whole system.
For APD photodetectors under faint energy output pulse signal narrower width, and slave laser target visit
There is noise jamming in examining system, design a kind of peak value hold module of pulse signal because servomotor drives, and can make peak value
Retention time is deferred to tens of us, is easy to continuous sampling and data software filtering algorithm to process, and target seeker can be made to measure mesh
The stability of mark orientation or luffing angle is greatly improved with accuracy, is conducive to improving detection accuracy.Peak holding mould
Block is mainly made up of elements such as trans-impedance amplifier, Schottky diode, the holding capacitor of low ESR and high speed switch tubes.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or be converted,
And all these modifications and variations should all belong to the protection domain of claims of the present invention.
Claims (10)
1. a kind of signal processing system of photodetector, the current pulse signal of photodetector output is by preposition amplification mould
Block is converted into voltage pulse signal, it is characterised in that：Distinct matrix module receives the voltage pulse signal and is extracted
After amplification the signal peak retention time that the Distinct matrix module is exported is postponed by peak value hold module, then
A/D converter is sampled to the signal that the peak value hold module is exported, processor receive A/D converter output and
Mouthful and control signal and carry out angle on target value resolving, result of calculation is sent to middle control and is calculated by the processor by transceiver
Machine.
2. the signal processing system of a kind of photodetector according to claim 1, it is characterised in that：The variable gain
The buffer amplifiers of signal Jing first of control module output are delivered to the peak value hold module, the peak holding after amplifying
Module is additionally provided with the second buffer amplifier between the A/D converter.
3. the signal processing system of a kind of photodetector according to claim 2, it is characterised in that：The variable gain
The buffer amplifiers of signal Jing first of control module output are also delivered to synchronous triggering signal generation module after amplifying, described same
Step trigger generation module produces synchronous triggering signal and is delivered to the processor, for entering to the sampling of A/D converter
Row control, and carry out identification of code type.
4. the signal processing system of a kind of photodetector according to claim 3, 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.
5. the signal processing system of a kind of photodetector according to claim 4, it is characterised in that：The D/A conversions
Device output control voltage is to linear adjustable high voltage power supply module, the linear adjustable high voltage power supply module output bias voltage control signal
To the photodetector.
6. the signal processing system of a kind of photodetector according to claim 1, it is characterised in that：The photodetection
Device includes APD photodetectors and PIN photoelectric detector.
7. the signal processing system of a kind of photodetector according to claim 1, it is characterised in that：The preposition amplification
Module includes photodiode amplifier OPA656, and the control source negative pole end of the photodiode amplifier OPA656 passes through
Electric capacity C1 connects the outfan of photodetector, and the voltage output end of the photodiode amplifier OPA656 is used to connect institute
Distinct matrix module is stated, between the control source negative pole end and voltage output end of the photodiode amplifier OPA656
Feedback control loop is provided with, the feedback control loop includes resistance R2 and electric capacity C2 in parallel；The outfan connection of the photodetector
One end of resistance R1, the resistance R1 other ends ground connection, the pre-amplifying module passes through the resistance R1 by the smooth electrical resistivity survey
The current pulse signal for surveying device output is converted into voltage pulse signal.
8. the signal processing system of a kind 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
Control end Vp for stating variable gain amplifier AD8336 connects the signal output part of the pre-amplifying module, the variable gain
The signal output part of amplifier AD8336 is used to connect the peak value hold module；The Distinct matrix module also includes connecting
It is connected to the amplification configuration circuit and filter circuit of the variable gain amplifier AD8336.
9. the signal processing system of a kind 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 signals across
The outfan of impedance amplifier D, the trans-impedance amplifier D output voltage Vout is used to connect sample circuit, the trans-impedance amplifier D
Pressure reduction between voltage pulse signal Vin and output voltage Vout is amplified, the electric current of the trans-impedance amplifier D outputs leads to
Cross Schottky diode Z to be charged holding capacitor C4；The anode and negative electrode of the Schottky diode Z connects respectively described
The current output terminal C and buffer inputs IN of trans-impedance amplifier D.
10. the signal processing system of a kind of photodetector according to claim 9, it is characterised in that：The Schottky
The negative electrode of diode Z also connects controller by retention time control circuit, and the retention time control circuit includes opening at a high speed
Pipe Q and holding capacitor C4 are closed, the negative electrode of the Schottky diode Z connects one end of holding capacitor C4, the guarantor
Hold the other end ground connection of electric capacity C4；The colelctor electrode of the high speed switch tube Q connects holding capacitor C4 by resistance R8, described
The base stage of high speed switch tube Q connects the controller and receives control signal Discharge, the high speed switch tube by resistance R5
The grounded emitter of Q, between the base stage and emitter stage of the high speed switch tube resistance R7 is additionally provided with.
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