CN104296606B - A kind of laser fuze receives system - Google Patents
A kind of laser fuze receives system Download PDFInfo
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- CN104296606B CN104296606B CN201410423989.7A CN201410423989A CN104296606B CN 104296606 B CN104296606 B CN 104296606B CN 201410423989 A CN201410423989 A CN 201410423989A CN 104296606 B CN104296606 B CN 104296606B
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Abstract
The invention discloses a kind of laser fuze and receive system, this reception system comprises: receive optical unit, it is connected photodetector with described reception optical unit, the pre-amplification circuit being connected with described photodetector, the distance gain control circuit that the outfan of described pre-amplification circuit connects.By arranging photodetector, pre-amplification circuit in reception system, solve photoelectricity cross-interference issue；Distance gain control circuit is set simultaneously, adds signal filtering, distance gain function, solve the problem that laser fuze visual field is big, operating distance is remote, improve acceptance rate.
Description
Technical field
The present invention relates to laser fuze field, be specifically related to a kind of laser fuze and receive system.
Background technology
The reception system of laser fuze needs the optical signal of reception is converted into the signal of telecommunication, through amplifying and after shaping to late-class circuit.
Domestic have many unit Study of Laser fuses.But substantially it is only limitted to algorithm research and modeling, and is for naval vessels, the research of target that helicopter equal-volume is bigger, and the research almost blank of the laser fuze for low altitude small target.For deck-level large and small target, missile target encounter is complicated, and for not leaking spy target, laser fuze must can detect target in the range of playing 360 ° of axle.The most domestic reception system, there are employing avalanche photodide (APD), photomultiplier tube and PIN silicon detection system, but its bias voltage of APD detector is the highest, and photomultiplier tube to belong to external excitation sufficiently bulky, all cannot meet the reception system requirements of the efficient laser fuze of miniaturization.The reception systematic comparison using PIN silicon detector is suitable for laser fuze, but current domestic with the system photosurface a size of 1.5mm × 15mm of type, it is impossible to meet small form factor requirements.
Summary of the invention
It is an object of the invention to provide a kind of laser fuze and receive system, by arranging photodetector, pre-amplification circuit in reception system, solve photoelectricity cross-interference issue；Distance gain control circuit is set simultaneously, adds signal filtering, distance gain function, solve the problem that laser fuze visual field is big, operating distance is remote, improve acceptance rate.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of laser fuze receives system, is characterized in, this reception system comprises:
Receive optical unit；
Photodetector, is connected with described reception optical unit；
Pre-amplification circuit, is connected with described photodetector；
Distance gain control circuit, the input of described distance gain control circuit is connected with the outfan of described pre-amplification circuit.
Preferably, described distance gain control circuit comprises:
Main amplifier, the first input end of described main amplifier is connected with the outfan of described pre-amplification circuit；
Gain control circuit, the first input end of described gain control circuit is connected with the outfan of described pre-amplification circuit, and the second input of this gain control circuit is connected with the outfan of this gain control circuit；The outfan of this gain control circuit is connected with the second input of described main amplifier；
Voltage comparator, the input of described voltage comparator is connected with the outfan of described main amplifier.
Preferably, described pre-amplification circuit comprises:
Power supply, and be connected with described power supply respectively resistance RL, resistance R1, resistance R2；
The other end of described resistance RL is sequentially connected with the base stage of electric capacity C1, audion BG1, and the emitter stage of described audion BG1 is connected with resistance R3, the other end ground connection of described resistance R3；
The other end of described resistance R1 is connected with colelctor electrode, the base stage of audion BG2 of described audion BG1 respectively；
The other end of described resistance R2 is connected with colelctor electrode, the electric capacity C2 of described audion BG2 respectively, the outfan that the other end is described pre-amplification circuit of described electric capacity C2；
The emitter stage of described audion BG2 is sequentially connected with resistance R5, resistance R6, the other end ground connection of described resistance R6；
One end of resistance R4 is connected with the base stage of described audion BG1, and the other end of this resistance R4 is arranged between described resistance R5, resistance R6；
One end of electric capacity C3 is arranged between described resistance R5, resistance R6, the other end ground connection of described electric capacity C3.
Preferably, one end of described photodetector is arranged between described resistance RL and electric capacity C1, the other end ground connection of this photodetector.
Preferably, described photodetector is silicon PIN-type detector, and the negative pole of this photodetector is arranged between described resistance RL and electric capacity C1, the plus earth of this photodetector.
Preferably, described gain control circuit comprises: multiplier, and connected first signal processing circuit, secondary signal process circuit, Dolby circuit respectively；The outfan of described multiplier is connected with the second input of described main amplifier.
Preferably, described first signal processing circuit comprises: electric capacity C11, resistance R11 and diode D2；
The outfan of described pre-amplification circuit and described electric capacity C11, resistance R11 are sequentially connected with rear ground connection, and described diode D2 is connected in parallel to described resistance R11 two ends；The X1 input of described multiplier is connected between described electric capacity C11, resistance R11.
Preferably, described secondary signal process circuit comprises: resistance R9, resistance R10 and electric capacity C21；
Outer distance gate signal end and described resistance R9, electric capacity C21 are sequentially connected with and ground connection, and described resistance R10 is connected in parallel to described electric capacity C21 two ends；The Y1 input of described multiplier is connected between described electric capacity C21, resistance R9.
Preferably, described Dolby circuit comprises: resistance R12, resistance R13, resistance R14, electric capacity C22 and electric capacity C24；
Described resistance R12 one end is connected with outside first reference voltage end, and this resistance R12 other end X2 input with described resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and described multiplier respectively is connected；The described resistance R14 other end, the electric capacity C22 other end, electric capacity C24 other end ground connection respectively；The described resistance R13 other end is connected with outside second reference voltage end.
Preferably, described gain control circuit also comprises: resistance R15, resistance R16；The outfan of described multiplier and described resistance R15, resistance R16 are sequentially connected with and ground connection；The Z input of this multiplier is connected between described resistance R15, resistance R16.
The present invention compared with prior art has the advantage that
The present invention, by designed in conjunction to photodetector, pre-amplification circuit, solves photoelectricity cross-interference issue, in the case of ensureing that output signal is the most distortionless, the frequency response bandwidth of pre-amplification circuit is controlled by, to reduce thermal noise and shot noise.Meanwhile, increase gain control circuit and can increase filtering and distance gain control function, solve the feature that laser fuze visual field is big, operating distance is remote, improve receiving efficiency.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that a kind of laser fuze of the present invention receives system.
Fig. 2 is the local circuit schematic diagram that a kind of laser fuze of the present invention receives system.
Fig. 3 is the circuit diagram that a kind of laser fuze of the present invention receives the gain control circuit of system.
Fig. 4 is one of embodiment schematic diagram of a kind of laser fuze of present invention reception system.
Detailed description of the invention
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As it is shown in figure 1, a kind of laser fuze receives system, this reception system comprises: receive optical unit 10, photodetector 20, pre-amplification circuit 30 and distance gain control circuit 40.
Photodetector 20 is connected with receiving optical unit 10；Pre-amplification circuit 30 is connected with photodetector 20；The input of distance gain control circuit 40 is connected with the outfan of pre-amplification circuit 30.
When less demanding to the input impedance of pre-amplification circuit 30, and when volume size allows, common low noise audion can be as pre-amplification circuit, and its bandwidth requirement and noise can meet requirement.The application uses two-stage to send out emitter transistor altogether to be designed to pre-amplification circuit 30.
As in figure 2 it is shown, pre-amplification circuit 30 comprises: power supply, and be connected with power supply respectively resistance RL, resistance R1, resistance R2.The other end of resistance RL is sequentially connected with the base stage of electric capacity C1, audion BG1, and the emitter stage of audion BG1 is connected with resistance R3, the other end ground connection of resistance R3.The other end of resistance R1 is connected with colelctor electrode, the base stage of audion BG2 of audion BG1 respectively.The other end of resistance R2 is connected with colelctor electrode, the electric capacity C2 of audion BG2 respectively, and the other end of electric capacity C2 is the outfan of pre-amplification circuit 30.The emitter stage of audion BG2 is sequentially connected with resistance R5, resistance R6, the other end ground connection of resistance R6；One end of resistance R4 is connected with the base stage of audion BG1, and the other end of this resistance R4 is arranged between resistance R5, resistance R6；One end of electric capacity C3 is arranged between resistance R5, resistance R6, the other end ground connection of electric capacity C3.
One end of photodetector 20 is arranged between resistance RL and electric capacity C1, the other end ground connection of this photodetector 20.
In the present embodiment, photodetector 20 is silicon PIN-type detector, and the negative pole of this photodetector 20 is arranged between resistance RL and electric capacity C1, the plus earth of this photodetector 20.Selecting silicon PIN-type detector as photodetector 20, be that responsiveness reaches 0.5A/W～0.6A/W owing to silicon PIN-type detector is when λ=900nm, response time is several nanosecond, and dark current is only tens na, and its characteristic meets the design requirement of the present invention.
The pre-amplification circuit that two-staged transistor BG1, BG2 are set up, for send out emitter stage configuration, existing current gain altogether, has again voltage gain.What photodetector 20 added is reverse bias, and after illumination, reverse current increases, and this reverse current is linear with incident optical power.In detector input circuit, then:
The dark resistance of RD--photodetector；
RL--load resistance；
UB--supply voltage；
The photoelectric conversion signal voltage of US output.
Above formula is carried out differential, obtains:
Above formula gives the relational expression of bias, load resistance and signal, and as RL=RD, Δ US has maximum.But in specific design, the impact of noise coefficient to be considered etc., it is excessive that the value of RL can not take.
Then the output voltage of pre-amplification circuit 30 is:
U0=-k Δ US；
The amplification coefficient of k--pre-amplification circuit.
As it is shown in figure 1, distance gain control circuit 40 comprises: main amplifier 41, gain control circuit 42 and voltage comparator 43.
The first input end of main amplifier 41 is connected with the outfan of pre-amplification circuit 30；The first input end of gain control circuit 42 is connected with the outfan of pre-amplification circuit 30, and the outfan of this gain control circuit 42 is connected with the second input of gain control circuit 42, the second input of main amplifier 41 respectively；The input of voltage comparator 43 is connected with the outfan of main amplifier 41.
As it is shown on figure 3, gain control circuit 42 comprises: multiplier, connected first signal processing circuit, secondary signal process circuit, Dolby circuit respectively.The outfan of multiplier is connected with the second input of main amplifier 41.
First signal processing circuit comprises: electric capacity C11, resistance R11 and diode D2.The outfan of pre-amplification circuit 30 and electric capacity C11, resistance R11 are sequentially connected with rear ground connection, and diode D2 is connected in parallel to resistance R11 two ends；The X1 input of multiplier is connected between electric capacity C11, resistance R11.
Secondary signal processes circuit and comprises: resistance R9, resistance R10 and electric capacity C21.Outer distance gate signal end and resistance R9, electric capacity C21 are sequentially connected with and ground connection, and resistance R10 is connected in parallel to electric capacity C21 two ends；The Y1 input of multiplier is connected between described electric capacity C21, resistance R9.
In the present invention, external motor processes circuit by the secondary signal of transmission range gate signal to gain control circuit 42.
Dolby circuit comprises: resistance R12, resistance R13, resistance R14, electric capacity C22 and electric capacity C24.Resistance R12 one end is connected with outside first reference voltage end, and this resistance R12 other end X2 input with resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and multiplier respectively is connected；The resistance R14 other end, the electric capacity C22 other end, electric capacity C24 other end ground connection respectively；The described resistance R13 other end is connected with outside second reference voltage end.
Gain control circuit 42 also comprises: resistance R15, resistance R16；The outfan of described multiplier and described resistance R15, resistance R16 are sequentially connected with and ground connection；The Z input of this multiplier is connected between described resistance R15, resistance R16.
As it is shown on figure 3, the multiplier selecting model to be AD835AN in the present invention is used as multiplier.The Y2 input end grounding of multiplier.The utilization principle of this multiplier is as follows:
X=X1-X2；
Y=Y1-Y2；
W=K (X Y+Z)；
Wherein, X1 is the X1 input of multiplier, and X2 is the X2 input of multiplier, and Y1 is the Y1 input of multiplier, and Y2 is the Y2 input of multiplier, and Z is the Z input of multiplier, K be multiplier amplification, W is the outfan of multiplier.
Process the output signal of photodetector 20 according to above formula calculating, control gain rule over time so that although in-plant echo-signal returns fast, but it is the least to control gain, and remote echo-signal returns slow, control gain and be gradually increased.Thus to in-plant cloud layer signal attenuation, and target echo signal at a distance can be amplified.
As shown in Figure 4, external motor is by a width of 150ns during transmission range gate signal, range gate is integrated by gain control circuit 42, obtain one and increase the time gain control oblique line that gain incrementally increases with distance, the output signal of pre-amplification circuit 30 is controlled oblique line with time gain and is multiplied by main amplifier 41, and output bells is to voltage comparator 43.Reduction will be increased by the near signal of respective distances apart from remote signal.In order to make low coverage become big with the gain difference of long distance, the preposition 50ns signal amplifying output can be carried out differential process, become the width of about 10ns, so mainly use forward position rather than the pulse width of echo, low coverage can be made higher with the temporal resolution of long distance.
In the present invention, the selection to main amplifier 41 requires mainly to include high-gain, broadband and adjustable gain.In the present embodiment, AD603 or AD8369 chip is used to be used as main amplifier 41；MAX903 chip is used to be used as voltage comparator 43.
One laser fuze of the present invention receives system, and in actual use, specific works principle is as follows:
Receive optical unit 10 and receive optical echo signal, and carry out integrating, being polymerized by this optical echo signal, make the optical signal after processing carry out conversion by photodetector 20 and become the signal of telecommunication, this signal of telecommunication is amplified processing through pre-amplification circuit 30, signal after process processes through distance gain control circuit 40, exports corresponding TTL pulse signal and processes for late-class circuit.
The present invention experiments verify that, photodetector 20, the responsiveness of pre-amplification circuit 30 reach 2 × 105V/W, sensitivity reaches 250nW, and the rate of climb is 18ns, and volume is only φ 15mm × 5mm.
The square-wave signal receiving system output through laser fuze is 100mV, and repetition rate is 10kHz.Acquisition test result is as follows:
For the system that pulsewidth is narrower, the effect of time-varying gain control significantly improves, and makes signal amplitude change smooth-out, the Linear Control of the strongest signal.This laser fuze receives system makes the forward position of signal become the most stable, improves range accuracy.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that the description above is not considered as limitation of the present invention.After those skilled in the art have read foregoing, multiple amendment and replacement for the present invention all will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. a laser fuze receives system, it is characterised in that this reception system comprises:
Receive optical unit (10)；
Photodetector (20), is connected with described reception optical unit (10)；
Pre-amplification circuit (30), is connected with described photodetector (20)；
Distance gain control circuit (40), the input of described distance gain control circuit (40) is connected with the outfan of described pre-amplification circuit (30)；
Described distance gain control circuit (40) comprises:
Main amplifier (41), the first input end of described main amplifier (41) is connected with the outfan of described pre-amplification circuit (30)；
Gain control circuit (42), the first input end of described gain control circuit (42) is connected with the outfan of described pre-amplification circuit (30), and second input of this gain control circuit (42) is connected with the outfan of this gain control circuit (42)；The outfan of this gain control circuit (42) is connected with the second input of described main amplifier (41)；
Voltage comparator (43), the input of described voltage comparator (43) is connected with the outfan of described main amplifier (41).
2. laser fuze as claimed in claim 1 receives system, it is characterised in that described pre-amplification circuit (30) comprises:
Power supply, and be connected with described power supply respectively resistance RL, resistance R1, resistance R2；
The other end of described resistance RL is sequentially connected with the base stage of electric capacity C1, audion BG1, and the emitter stage of described audion BG1 is connected with resistance R3, the other end ground connection of described resistance R3；
The other end of described resistance R1 is connected with colelctor electrode, the base stage of audion BG2 of described audion BG1 respectively；
The other end of described resistance R2 is connected with colelctor electrode, the electric capacity C2 of described audion BG2 respectively, the outfan that the other end is described pre-amplification circuit (30) of described electric capacity C2；
The emitter stage of described audion BG2 is sequentially connected with resistance R5, resistance R6, the other end ground connection of described resistance R6；
One end of resistance R4 is connected with the base stage of described audion BG1, and the other end of this resistance R4 is arranged between described resistance R5, resistance R6；
One end of electric capacity C3 is arranged between described resistance R5, resistance R6, the other end ground connection of described electric capacity C3.
3. laser fuze as claimed in claim 2 receives system, it is characterised in that one end of described photodetector (20) is arranged between described resistance RL and electric capacity C1, the other end ground connection of this photodetector (20).
4. laser fuze as claimed in claim 3 receives system, it is characterized in that, described photodetector (20) is silicon PIN-type detector, the negative pole of this photodetector (20) is arranged between described resistance RL and electric capacity C1, the plus earth of this photodetector (20).
5. laser fuze as claimed in claim 1 receives system, it is characterised in that described gain control circuit (42) comprises:
Multiplier, connected first signal processing circuit, secondary signal process circuit, Dolby circuit respectively；
The outfan of described multiplier is connected with the second input of described main amplifier (41).
6. laser fuze as claimed in claim 5 receives system, it is characterised in that described first signal processing circuit comprises: electric capacity C11, resistance R11 and diode D2；
The outfan of described pre-amplification circuit (30) and described electric capacity C11, resistance R11 are sequentially connected with rear ground connection, and described diode D2 is connected in parallel to described resistance R11 two ends；The X1 input of described multiplier is connected between described electric capacity C11, resistance R11.
7. laser fuze as claimed in claim 5 receives system, it is characterised in that described secondary signal processes circuit and comprises: resistance R9, resistance R10 and electric capacity C21；
Outer distance gate signal end and described resistance R9, electric capacity C21 are sequentially connected with and ground connection, and described resistance R10 is connected in parallel to described electric capacity C21 two ends；The Y1 input of described multiplier is connected between described electric capacity C21, resistance R9.
8. laser fuze as claimed in claim 5 receives system, it is characterised in that described Dolby circuit comprises:
Resistance R12, resistance R13, resistance R14, electric capacity C22 and electric capacity C24；
Described resistance R12 one end is connected with outside first reference voltage end, and this resistance R12 other end X2 input with described resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and described multiplier respectively is connected；The described resistance R14 other end, the electric capacity C22 other end, electric capacity C24 other end ground connection respectively；The described resistance R13 other end is connected with outside second reference voltage end.
9. laser fuze as claimed in claim 5 receives system, it is characterised in that described gain control circuit (42) also comprises: resistance R15, resistance R16；
The outfan of described multiplier and described resistance R15, resistance R16 are sequentially connected with and ground connection；The Z input of this multiplier is connected between described resistance R15, resistance R16.
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| CN105988121A (en) * | 2015-03-03 | 2016-10-05 | 欧鹏 | Signal processing system for identification friend or foe (IFF) transponder |
| CN105509578B (en) * | 2015-11-19 | 2018-01-30 | 上海无线电设备研究所 | A kind of laser fuze and its method of the detection of multichannel omnidirectional |
| CN105486180B (en) * | 2015-12-15 | 2017-03-22 | 西安电子科技大学 | Laser-fuze near-field return wave power calculation method based on wave beam decomposition and partial irradiation |
| CN106374854B (en) * | 2016-09-05 | 2019-05-10 | 中国科学院高能物理研究所 | Galvo-preamplifier, time resolution reading circuit and time resolved detection device |
| CN106341088B (en) * | 2016-09-05 | 2019-03-12 | 中国科学院高能物理研究所 | Galvo-preamplifier, time resolution reading circuit and time resolved detection device |
| CN106646618A (en) * | 2016-09-09 | 2017-05-10 | 上海电机学院 | Capacitive orientation detection circuit |
| CN107147438A (en) * | 2016-09-19 | 2017-09-08 | 国家电网公司 | A kind of portable fiber-optic tester |
| CN107289825A (en) * | 2017-06-09 | 2017-10-24 | 上海无线电设备研究所 | It is a kind of that the anti-sea clutter background interference method received is detected based on subregion |
| CN108828564A (en) * | 2018-06-29 | 2018-11-16 | 成都楼兰科技有限公司 | Laser signal receivers |
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| SE466821B (en) * | 1987-09-21 | 1992-04-06 | Bofors Ab | DEVICE FOR AN ACTIVE OPTICAL ZONRER AASTADKOMMA HIGHLIGHTS OF LIGHTENING AGAINST RETURNS, SMOKE, CLOUDS ETC |
| CN201583211U (en) * | 2009-12-24 | 2010-09-15 | 中国航天科工集团第三研究院第八三五八研究所 | Laser fuze |
| CN102323576B (en) * | 2011-05-30 | 2013-02-13 | 北京理工大学 | Gain-adjustable high-bandwidth laser receiving circuit |
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