CN104296877B - A kind of signal processing circuit of infrared detector - Google Patents
A kind of signal processing circuit of infrared detector Download PDFInfo
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- CN104296877B CN104296877B CN201310616506.0A CN201310616506A CN104296877B CN 104296877 B CN104296877 B CN 104296877B CN 201310616506 A CN201310616506 A CN 201310616506A CN 104296877 B CN104296877 B CN 104296877B
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Abstract
The invention discloses a kind of signal processing circuit of infrared detector, including aperture control circuit, match circuit, amplification and target detecting circuit and information-processing circuit, signal from polynary alignment infrared detector is amplified and frequency processing, and the signal logic of whole passages and the central passage of setting number is superimposed using information-processing circuit, the mark that target is present finally is formed by logical signal form in each channel, and is transformed into logical signal and gives electronic building brick；Center channel gain is automatically controlled using aperture control circuit, and forms aperture control signal, the aperture in opto-mechanical part is controlled by drive device.The signal processing circuit of the present invention is adjusted to multiunit detector output signal inconsistency, sets suitable adjusting range, and high gain, dynamic range are big, and anti-interference is good, self-excitation and suppression noise immune are strong.Modularized design reliability height, small volume, lightweight, interchangeability are strong.
Description
Technical field
The present invention relates to a kind of signal processing technology, and in particular to a kind of signal processing circuit of infrared detector.
Background technology
With the fast development of infrared detector Development Techniques, infrared imaging system is widely used in military and civilian neck
In domain.Most crucial device is infrared detector in infrared imaging system, and infrared energy is converted into electric energy or other physics
The device of amount is referred to as infrared detector.The signal processing circuit of detector is mainly carries out simulation tune to the signal that detector is exported
Reason, analog-to-digital conversion, while carrying out corresponding data processing in order to which collecting device carries out data acquisition or storage.Set in electronics
From the point of view of meter, the image quality of whole infrared imaging system is improved in addition to selecting high performance detector, is designed low
The high-quality infrared detector signal processing circuit of noise is very crucial.
64 yuan of alignment infrared detector signal processing circuits are for the infrared small and weak letter to 64 yuan of detector array output
Number be amplified and frequency processing, enable to be exaggerated, handle after detector signal recognized by general electronic equipment, 64 yuan of alignments
Infrared detector output signal is made up of 12 Lu Zhizheng channel signals and 52 road circumferential passages signals.
The signal processing circuit of 64 yuan of alignment infrared detectors is used in the IRDS of product, and circuit should have
Sufficiently high gain has big dynamic range again, and this requires transmission coefficient K more than 104, automatic gain 50db~
More than 70db, and should have sufficiently high gain to have the ability that can suppress interference, self-excitation and noise again to small-signal, it is small
The self-excitation of signal high gain amplification, anti-interference the problem of be very thorny, it is also to be difficult to solve to effectively reduce target false alarm rate
The problem of.
64 yuan of infrared detector signal processing circuits of external production also have preferable performance currently on the market, but it is
Special infrared detector is used cooperatively with its, and the effect that can be only achieved is not particularly suited for domestic detector, and buy into
This is very high, and maintainability is poor.
The content of the invention
It is an object of the invention to provide a kind of signal processing circuit of infrared detector, bought with solving existing process circuit
Cost is high, the problem of maintainability is poor.In order to realize the above object the technical solution adopted in the present invention is：A kind of infrared acquisition
The signal processing circuit of device, including aperture control circuit, match circuit, amplification and target detecting circuit and information-processing circuit,
Amplification and target detecting circuit include central passage and amplified and target detecting circuit and circumferential passages amplification and target detecting circuit,
Information-processing circuit includes central passage information-processing circuit and circumferential passages information-processing circuit；The center, surrounding are amplified
And target detecting circuit is used for the signal and the manual Regulate signal of electronic building brick for the respective channel that pick-up probe is inputted, and is used in combination
In exporting corresponding logical signal to electronic building brick, output amplitude selection signal to corresponding center, peripheral information process circuit,
And export for debugging when observation circuit working condition processing simulation signal and video analog signal；The center, surrounding
Information-processing circuit is used to be output to after the amplitude selection signal of corresponding amplification and the input of target detecting circuit is overlapped
Match circuit；The match circuit is used to the superposed signal of the superposed signal of correspondence central passage and whole passages being output to light
Circle control circuit, while being detected for the threshold voltage signal for exporting respective channel to corresponding center, surrounding amplification and target
Circuit；The aperture control circuit is used for the trigger signal and corresponding passage superposed signal for receiving electronic building brick, and for defeated
Go out automatic gain signal to central passage to amplify and target detecting circuit, while for exporting aperture control signal.
The central passage amplification and target detecting circuit include the regulation amplifying circuit being sequentially connected with and the second amplification electricity
Road, the input of the second amplifying circuit is additionally operable to receive the automatic gain signal for controlling circuit input from aperture, the second amplification electricity
Input of the output end on road respectively with limit filtration circuit and bandwidth-limited circuit is connected, limit filtration circuit and bandpass filtering
The output end of circuit and the manual Regulate signal inputted from electronic building brick are all connected to the input of a thresholding line trap, the door
The output end of limit line trap is used to export video analog signal, and respectively with logic superimposer and the input of a limiting amplifier
Connection, the output end of the logic superimposer is used for output amplitude selection signal, and the input of the limiting amplifier is additionally operable to
The threshold voltage signal for being inputted from match circuit is received, the output end of limiting amplifier is used for after being connected by a comparator
Export corresponding logical signal.
The circumferential passages amplification and target detecting circuit include regulation amplifying circuit, the output end point of regulation amplifying circuit
Input not with limit filtration circuit and bandwidth-limited circuit is connected, the output end of limit filtration circuit and bandwidth-limited circuit
And the manual Regulate signal inputted from electronic building brick is all connected to the input of a thresholding line trap, the thresholding line trap it is defeated
Going out end is used to export video analog signal, and the input with logic superimposer and a limiting amplifier is connected respectively, described to patrol
The output end of volume superimposer is used for output amplitude selection signal, the input of the limiting amplifier be additionally operable to receive be used for from
The threshold voltage signal inputted with circuit, the output end of limiting amplifier is used to export corresponding patrol after connecting by a comparator
Collect signal.
The aperture control circuit includes the first analog switch and the second analog switch, and the input of the first analog switch is used
In the superposed signal and the strobe signal from electronic building brick input of connection correspondence central passage, the input of the second analog switch
Hold and connect signal with the automatic gain inputted from electronic building brick for connecting the superposed signal of whole passages, two analog switches it is defeated
Go out end and be sequentially connected with filtering and amplifying circuit and sampling hold circuit, the output end of the sampling hold circuit passes through two comparators
Corresponding aperture control signal is exported respectively, while input of the output end of sampling hold circuit also with the second analog switch is anti-
Feedback connection, the second analog switch is used for output feedback signal to thresholding limiter, the output end of thresholding limiter and an adder
Connection, the adder is used to form automatic gain signal.
Second amplifying circuit even multiplies multiplier for simulation.
The regulation amplifying circuit includes the potentiometer and operational amplifier being sequentially connected with.
The limit filtration circuit includes limiting amplifier, wave detector and the wave filter being sequentially connected with.
The filtering and amplifying circuit includes being connected with for believing on the amplifier and wave filter being sequentially connected with, the wave filter
The energy-storage travelling wave tube of number energy storage.
The aperture control circuit also includes the reset circuit for being used to discharge to energy-storage travelling wave tube, and the reset circuit includes defeated
Enter double single-shot trigger triggers that end is used to receive the pulse signal since the picture that electronic building brick is inputted, double single-shot trigger triggers
Output end is connected by the 3rd analog switch with energy-storage travelling wave tube.
The signal processing circuit of the infrared detector of the present invention includes aperture control circuit, match circuit, amplification and target
Detecting circuit and information-processing circuit, are entered using amplification and target detecting circuit to the signal from polynary alignment infrared detector
Row amplification and frequency processing, and the signal logic of whole passages and the central passage of setting number is folded using information-processing circuit
Plus, the mark that target is present finally is formed by logical signal form in each channel, and is transformed into logical signal and gives electronics
Component；Center channel gain is automatically controlled using aperture control circuit, and forms aperture control signal, is filled by driving
Put and the aperture in opto-mechanical part is controlled.The signal processing circuit of the present invention is to multiunit detector output signal inconsistency
It is adjusted, suitable adjusting range is set, it is not influenceed bandwidth and other performance；High gain, dynamic range are big, anti-interference
Property good, self-excitation and suppress noise immune it is strong.Modularized design reliability height, small volume, lightweight, interchangeability are strong, are applicable to
The signal amplification and frequency band processing of 64 yuan of alignment infrared detectors.
Brief description of the drawings
The signal processing circuit schematic diagram of Fig. 1 infrared detectors of the present invention；
Fig. 2 is the structure principle chart of signal processing circuit embodiment of the present invention；
Fig. 3 is that central passage of the present invention is amplified and target detecting circuit schematic diagram；
Fig. 4 is that central passage of the present invention is amplified and target detecting circuit embodiment schematic diagram；
Fig. 5 is that circumferential passages of the present invention amplify and target detecting circuit schematic diagram；
Fig. 6 is that aperture of the present invention controls circuit embodiments schematic diagram；
Fig. 7 is bandwidth-limited circuit structure chart of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described further specific embodiment.
It is the schematic diagram of the signal processing circuit of infrared detector of the present invention, as seen from the figure, the signal transacting as shown in Figure 1
Circuit includes aperture control circuit, match circuit, amplification and target detecting circuit and information-processing circuit, amplification and target detection
Circuit includes central passage and amplified and target detecting circuit and circumferential passages amplification and target detecting circuit, information-processing circuit bag
Include central passage information-processing circuit and circumferential passages information-processing circuit；Center, surrounding amplification and target detecting circuit are used for
The signal and the manual Regulate signal of electronic building brick of the respective channel of pick-up probe input, and for exporting corresponding logic letter
Number arrive electronic building brick, output amplitude selection signal to corresponding center, peripheral information process circuit, and export for debug when
The processing simulation signal and video analog signal of observation circuit working condition；Center, peripheral information process circuit are used for will correspondence
Amplification and target detecting circuit input amplitude selection signal be overlapped after be output to match circuit；Match circuit is used for will
The superposed signal of correspondence central passage and the superposed signal of whole passages are output to aperture control circuit, while for exporting correspondence
The threshold voltage signal of passage amplifies and target detecting circuit to corresponding center, surrounding；Aperture control circuit is used to receive electricity
The trigger signal of sub-component and corresponding passage superposed signal, and amplify for exporting automatic gain signal to central passage and mesh
Detecting circuit is marked, while for exporting aperture control signal.
The application structure schematic diagram of the embodiment of the present invention is illustrated in figure 2, is carried out by taking 64 yuan of alignment infrared detectors as an example
Illustrate, its output signal is made up of 12 Lu Zhizheng channel signals and 52 road circumferential passages signals, and signal processing circuit is mainly by 1
Central passage amplifier and 4 identical circumferential passages amplifier compositions.
Central passage amplifier includes 12 blocks of identical central passage amplification boards, 1 block message process plate, 1 block of aperture
Control panel and 1 Block- matching plate.Central passage amplification board carries central passage amplification and target detecting circuit, mainly logical to center
Road signal is amplified and frequency processing, the echo signal input electronic building brick of detection；In in central passage information processing board
Heart channel information process circuit mainly produces the ± 15V power supplys of cabinet, and the amplitude selection signal of 12 Lu Zhizheng passages is folded
Plus；12 Lu Zhizheng passages are amplified aperture control circuit in aperture control panel and the gain of target detecting circuit is increased automatically
Benefit control, and aperture control signal is formed, the aperture in opto-mechanical part is controlled by drive device；In matching disc
It is used to the superposed signal of 64 passages of superposed signal and whole of 6 passages in 12 central passages being output to aperture with circuit
Circuit is controlled, while electric to corresponding center, surrounding amplification and target detection for the threshold voltage signal for exporting respective channel
Road.
Each circumferential passages amplifier includes 13 pieces of identical circumferential passages amplification boards and 1 block message process plate.
Circumferential passages amplification board carries circumferential passages amplification and target detecting circuit, mainly circumferential passages signal is amplified and frequency
Rate processing, the echo signal of detection also inputs electronic building brick；The circumferential passages information-processing circuit of circumferential passages information processing board
Main ± 15V the power supplys for producing cabinet, and the amplitude selection signal of corresponding 13 road circumferential passages is superimposed.
Be illustrated in figure 3 central passage amplification and target detecting circuit schematic diagram, as seen from the figure, the central passage amplification and
Target detecting circuit includes the regulation amplifying circuit and the second amplifying circuit being sequentially connected with, and the input of the second amplifying circuit is also used
In receiving automatic gain signal that circuit input is controlled from aperture, the output end of the second amplifying circuit respectively with limit filtration circuit
Connected with the input of bandwidth-limited circuit, in addition, bandwidth-limited circuit is also exported for observation circuit working condition when debugging
Processing simulation signal, the output end of limit filtration circuit and bandwidth-limited circuit and the manual tune for being inputted from electronic building brick
Section signal is all connected to the input of a thresholding line trap, and the output end of the thresholding line trap is used to export video simulation letter
Number, and the input with logic superimposer and a limiting amplifier is connected respectively, the output end of the logic superimposer is for defeated
Go out amplitude selection signal, the input of the limiting amplifier is additionally operable to receive the threshold voltage letter for being used for inputting from match circuit
Number, the output end of limiting amplifier is used to export corresponding logical signal after connecting by a comparator.
As shown in figure 4, second amplifying circuit of the present embodiment uses the simulation being made up of 3 analog multipliers to connect multiplication
Device；Regulation amplifying circuit includes the potentiometer and operational amplifier being sequentially connected with；Limit filtration circuit includes the limit being sequentially connected with
Width amplifier, wave detector and wave filter；Bandwidth-limited circuit uses the second-order bandpass filter being made up of integrated circuit A4 and A5.
The signal processing flow of central passage is as follows：The center channel signal come from infrared detector output end is first transported to
On potentiometer, then from the sliding contact of potentiometer to the input of operational amplifier；Subsequent signal even multiplies multiplier by 3 simulations
A1, A2 and A3 are amplified, and amplification coefficient is in AGC voltage UAGCDuring=10V for 1000,3 multiplier electric capacity and
Resistance is separated.Simulation even multiplies multiplier according to input automatic gain signal UAGCChange, adjust and control putting for the channel signal
Big coefficient.
The noise voltage for even multiplying multiplier A3 outputs from simulation is sent on first limiting amplifier A6, is put by amplitude limit
Greatly, detection and by wave filter after, form the direct current threshold voltage proportional to noise voltage root mean square, be sent to thresholding line trap
Input.
Even multiply the noise voltage of multiplier A3 outputs from simulation while being sent to the second order being made up of integrated circuit A4 and A5
On bandpass filter, processing simulation output signal is produced after handling after filtering.It is illustrated in figure 7 the electricity of second-order bandpass filter
Lu Tu, the purpose for setting bandpass filter is to suppress noise；In addition, product is in big field scan, small field scan, intercepting and capturing tracking
The different sweep speed of working condition determines vision signal width, also determines the frequency characteristic of bandpass filter, band logical filter
The centre frequency of ripple device is 800Hz.
Analog output signal and manual Regulate signal from electronic building brick are also sent to this thresholding line trap, wherein manually
Regulate signal is 0V~2V DC voltage, and it can be adjusted according to the need for ambient noise.Thresholding line trap output end is defeated
The signal gone out is the video simulation output signal for reaming noise, observation circuit when it together is used to debug with processing simulation signal
Working condition, is handled while video simulation output signal is sent on the second limiting amplifier A7 and logic superimposer.Patrol
Superimposer output amplitude selection signal is collected, the signal is input to central passage information processing board, by operational amplifier superposition simultaneously
Amplification, aperture board is formed by matching disc（Aperture controls circuit）Input signal Σ 6K and Σ 64K（Central passage is led to surrounding
The amplitude selection signal in road is formed by overlap-add procedure jointly）.
The threshold voltage signal for also having match circuit to produce of limiting amplifier A7 inputs is sent to, it is led to by center
What the average value of 12 central passage amplitude selection signals of road information-processing circuit output was produced by enhanced processing.From amplitude limit
The signal of amplifier A7 output ends output is formed in the form of " negative " logic in the output end of comparator and represents what target was present
Signal.
Processing simulation output signal and manual Regulate signal from electronic building brick are input to thresholding line trap, thresholding notch
The signal of device output end output is the video simulation output signal for reaming noise, and it is used equally for adjusting with processing simulation output signal
The working condition of observation circuit during examination, while video simulation output signal is also sent to logic superimposer and second limiting amplifier
Handled on A7.
The threshold voltage for also having match circuit to produce of limiting amplifier input is input into, is exported from A7 output ends
Signal forms the signal for representing that target is present in comparator A8 output end in the form of " negative " logic.
It is illustrated in figure 5 the schematic diagram of circumferential passages amplification and target detecting circuit, itself and the central passage video amplifier
Composition be largely identical, the main distinction is circumferential passages amplification and target detecting circuit not according to automatic gain
（AGC）Second amplifying circuit of adjust gain（That is analog multiplier）.
Circumferential passages signal processing is as follows：The circumferential passages signal come from infrared detector output end is first transported to week
On the potentiometer for enclosing passage amplification and target detecting circuit, then from the sliding contact of potentiometer to the input of operational amplifier.
The noise voltage exported from operational amplifier is sent on first limiting amplifier A6, by limited range enlargement, inspection
Ripple and by wave filter after, form the direct current threshold voltage proportional to noise voltage root mean square, be sent to the defeated of thresholding line trap
Enter end.The noise voltage is sent on second-order bandpass filter simultaneously, and processing simulation output signal is produced after handling after filtering.
Analog output signal and manual Regulate signal from electronic building brick also enter into thresholding line trap, thresholding line trap
The signal of output end output is the video simulation output signal for reaming noise, and it is used equally for debugging with processing simulation output signal
When observation circuit working condition, while video simulation output signal is also sent to logic superimposer and second limiting amplifier A7
It is upper to be handled.
Logic superimposer output amplitude selection signal, the signal is input to circumferential passages information processing board, put by computing
Big device is superimposed and amplified, and passes through the input signal Σ 64K of matching disc formation aperture board（Central passage and the amplitude of circumferential passages are selected
Signal is selected to be formed by overlap-add procedure jointly）.
The threshold voltage for also having match circuit to produce of limiting amplifier A7 inputs is input into, from the output of A7 output ends
Signal in comparator A8 output end in the form of " negative " logic formed represents target presence signal.
The schematic diagram that aperture controls circuit is illustrated in figure 6, as seen from the figure, aperture control circuit includes the first simulation and opened
Close D1 and the second analog switch D2, the first analog switch D1 input be used for connect correspondence central passage superposed signal and from
The strobe signal of electronic building brick input, the second analog switch D2 input be used for the superposed signal for connecting whole passages and
The automatic gain inputted from electronic building brick connects signal, and the output end of two analog switches is sequentially connected with filtering and amplifying circuit and sampling
Holding circuit, the output end of sampling hold circuit exports corresponding aperture control signal respectively by two comparators, adopts simultaneously
Input feedback link of the output end of sample holding circuit also with the second analog switch D2, the second analog switch D2 is used to export anti-
Feedback signal is to thresholding limiter, and the output end of thresholding limiter is connected with an adder for being used to be formed automatic gain signal.
As shown in fig. 6, the filtering and amplifying circuit of the present embodiment includes the amplifier that is sequentially connected with and is made up of D4 and D5
The storage capacitor C1 for storage assembly is connected with wave filter, wave filter.
The signal processing of aperture control circuit is as follows：
Because product working status has big field scan, small field scan, intercepting and capturing three kinds of working conditions of tracking, in these three work
Under state, the sweep speed and frequency of 64 yuan of alignment infrared detectors are different.Needed in the case where intercepting and capturing tracking mode in electronics
Under the control of " 40 ' × 40 ' gate pulse " signal that component comes, light is produced by the superposed signal of middle 6 central passages
Control signal is enclosed, and the control of " automatic gain connection " signal of electronic building brick is needed under big field scan, small field scan state
Under system, aperture control signal is produced by the superposed signal of all 64 passages.
According to working condition, the passage superposed signal of centre 6 of the 12 Lu Zhizheng passages from match circuit and whole 64
The superposed signal input aperture board of individual passage, the superposed signal of middle 6 central passages is in " 40 ' × 40 ' come from electronic building brick
Under the control of gate pulse " signal, the filter being made up of integrated circuit D4 and D5 is sent to through amplifier by the first analog switch D1
On ripple device；Or the superposed signal of whole 64 passages is under the control of " automatic gain connection " signal come from electronic building brick,
It is sent to by the second analog switch D2 through amplifier on wave filter.Two analog switches are not closed at, and are only had in a certain period
One of closure, turns on corresponding signal input channel.
Signal is flattened into direct current signal by wave filter, and it is that product scans one（Infrared alignment detector is in work
When, it is to be detected by continuous scanning back and forth to realize in certain field range）The average value of gained signal, and in energy-storage travelling wave tube electricity
Hold energy storage on C1, subsequently into the input of sampling holder.
The signal exported from sampling holder is respectively fed to comparator D6 and D7 input, is correspondingly formed required light
Circle control level signal UD1 and UD2.
The relation of aperture control signal is as follows：
UD1 is " 1 ", and UD2 opens for " 0 " aperture；
UD1 is " 0 ", and UD2 is that " 0 " aperture is fixed；
UD1 is " 0 ", and UD2 closes for " 1 " aperture.
In addition, in the case where the second analog switch D2 is closed, the signal exported from sampling holder is also opened by simulation
The input that D2 feedbacks are transported to thresholding limiter is closed, the signal more than thresholding is sent to the input of adder, adder shape
Into AGC voltage（UAGC）.In frequency f=200Hz, pulsewidth T=400 μ s, input signal UinDuring=1mv, automatic gain control
Voltage U processedAGC=10V。
In order to ensure the continuity worked signal transacting, aperture control circuit also includes being used to discharge to energy-storage travelling wave tube
Reset circuit, reset circuit include input be used for receive since electronic building brick input picture pulse signal it is double monostable
Triggers circuit, the output end of double single-shot trigger triggers is connected by the 3rd analog switch with energy-storage travelling wave tube.Double single-shot trigger triggers
Pulse signal triggering is started by the picture from electronic building brick, a conversation structure is formed and starts μ s of pulse daley 120 or so, width
For 14 μ s or so direct impulse signal, it closes the 3rd analog switch D3, energy-storage travelling wave tube C1 is discharged, and restarts storage and comes
Handle next field signal.
The present embodiment center amplifier and the setting of the frequency characteristic of surrounding amplifier are as follows:Center amplifier and surrounding amplification
The selection of device optimum bandwidth is debugged with design, mainly the spectral characteristic of both analysis, calculating signal and noise, and optimum bandwidth is with
Frequency of heart can effectively suppress noise.According to the infrared target characteristic and noise frequency characteristic of detector, central passage amplification and mesh
The centre frequency of mark detecting circuit is set to 800 ± 50Hz, 500 ± 50Hz of frequency bandwidth, circumferential passages amplification and target detection electricity
Lu Zhizheng 800 ± 50Hz of frequency, frequency bandwidth。
The frequency characteristic of center and circumferential passages amplifier depends primarily on band pass filter circuit as shown in Figure 7, should
The transmission function of circuit is：；The center frequency of wave filter
Rate, bandwidth.If the μ of C=0.01 is held in power taking, resistance R3 scope is：
(56K~63K), further according to centre frequency fc scope, the scope that can calculate R1R2/ (R1+R2) is：（6.28K~
7.068K）.Therefore taking R3 to be 58.5K, R1 is 13.7K, and R2 is 13.5K.Then bandwidth-limited circuit centre frequency fcThe gain A C at place=
R3/2R1=58.5/（13.7*2）=2.13, the centre frequency of bandpass filter is：
Bandwidth：
Circuit transfer function is：
By calculating centre frequency fc=797.99 in the range of 800 ± 50Hz, and bandwidth B=544 meet design requirement
500 ± 50Hz and, it was demonstrated that the frequency characteristic of amplification and target detecting circuit meets general design requirement.
Claims (9)
1. a kind of signal processing circuit of infrared detector, it is characterised in that：Including aperture control circuit, match circuit, amplification
And target detecting circuit and information-processing circuit, amplification and target detecting circuit include central passage and amplified and target detecting circuit
With circumferential passages amplification and target detecting circuit, information-processing circuit includes central passage information-processing circuit and circumferential passages are believed
Cease process circuit；The central passage amplification and target detecting circuit, circumferential passages amplification and target detecting circuit are used to receive
The signal and the manual Regulate signal of electronic building brick of the respective channel of detector input, and arrived for exporting corresponding logical signal
Electronic building brick, output amplitude selection signal to corresponding center, peripheral information process circuit, and export for being monitored in debugging
The processing simulation signal and video analog signal of circuit working state；The center, peripheral information process circuit are used for will correspondence
Amplification and target detecting circuit input amplitude selection signal be overlapped after be output to match circuit；The match circuit is used
In the superposed signal of the superposed signal of correspondence central passage and whole passages is output into aperture control circuit, while for exporting
The threshold voltage signal of respective channel amplifies to corresponding central passage and target detecting circuit, circumferential passages amplification and target inspection
Go out circuit；The aperture control circuit is used for the trigger signal and corresponding passage superposed signal for receiving electronic building brick, wherein entirely
The superposed signal of portion's passage be used for export automatic gain signal to central passage amplify and target detecting circuit, whole passages fold
The superposed signal of plus signal or central passage is used to export aperture control signal.
2. the signal processing circuit of infrared detector according to claim 1, it is characterised in that：The central passage amplification
And target detecting circuit includes the regulation amplifying circuit and the second amplifying circuit that are sequentially connected with, the input of the second amplifying circuit is also
The automatic gain signal of circuit input is controlled from aperture for receiving, the output end of the second amplifying circuit is electric with limit filtration respectively
The input connection of road and bandwidth-limited circuit, the output end of limit filtration circuit and bandwidth-limited circuit and defeated from electronic building brick
The manual Regulate signal entered is all connected to the input of a thresholding line trap, and the output end of the thresholding line trap is regarded for output
Frequency analog signal, and the input with logic superimposer and a limiting amplifier is connected respectively, the output of the logic superimposer
Hold for output amplitude selection signal, the input of the limiting amplifier is additionally operable to receive the door for being used for inputting from match circuit
Voltage limit signal, the output end of limiting amplifier is used to export corresponding logical signal after connecting by a comparator.
3. the signal processing circuit of infrared detector according to claim 1, it is characterised in that：The circumferential passages amplification
And target detecting circuit includes regulation amplifying circuit, the output end for adjusting amplifying circuit is filtered with limit filtration circuit and band logical respectively
The output end of the input connection of wave circuit, limit filtration circuit and bandwidth-limited circuit and the manual tune inputted from electronic building brick
Section signal is all connected to the input of a thresholding line trap, and the output end of the thresholding line trap is used to export video simulation letter
Number, and the input with logic superimposer and a limiting amplifier is connected respectively, the output end of the logic superimposer is for defeated
Go out amplitude selection signal, the input of the limiting amplifier is additionally operable to receive the threshold voltage letter for being used for inputting from match circuit
Number, the output end of limiting amplifier is used to export corresponding logical signal after connecting by a comparator.
4. the signal processing circuit of infrared detector according to claim 1, it is characterised in that：The aperture controls circuit
Including the first analog switch and the second analog switch, the input of the first analog switch is used for the superposition for connecting correspondence central passage
Signal and the strobe signal inputted from electronic building brick, the input of the second analog switch are used for the superposition for connecting whole passages
Signal connects signal with the automatic gain inputted from electronic building brick, and the output end of two analog switches is sequentially connected with filtering and amplifying circuit
And sampling hold circuit, the output end of the sampling hold circuit exports corresponding aperture control by two comparators and believes respectively
Number, while input feedback link of the output end of sampling hold circuit also with the second analog switch, the second analog switch is used for
Output feedback signal is to thresholding limiter, and the output end of thresholding limiter is connected with an adder, and the adder is used to be formed
Automatic gain signal.
5. the signal processing circuit of infrared detector according to claim 2, it is characterised in that：Second amplifying circuit
Even multiply multiplier for simulation.
6. the signal processing circuit of the infrared detector according to Claims 2 or 3, it is characterised in that：The regulation amplification
Circuit includes the potentiometer and operational amplifier being sequentially connected with.
7. the signal processing circuit of the infrared detector according to Claims 2 or 3, it is characterised in that：The limit filtration
Circuit includes limiting amplifier, wave detector and the wave filter being sequentially connected with.
8. the signal processing circuit of infrared detector according to claim 4, it is characterised in that：The filtering and amplifying circuit
Including the amplifier and wave filter being sequentially connected with, the energy-storage travelling wave tube for signal energy storage is connected with the wave filter.
9. the signal processing circuit of infrared detector according to claim 8, it is characterised in that：The aperture controls circuit
Also include the reset circuit for being used to discharge to energy-storage travelling wave tube, the reset circuit, which includes input, to be used to receive defeated from electronic building brick
The picture entered starts double single-shot trigger triggers of pulse signal, the output ends of double single-shot trigger triggers by the 3rd analog switch with
Energy-storage travelling wave tube is connected.
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| CN104296877A (en) | 2015-01-21 |
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