CN104296606A - Laser fuse reception system - Google Patents
Laser fuse reception system Download PDFInfo
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- CN104296606A CN104296606A CN201410423989.7A CN201410423989A CN104296606A CN 104296606 A CN104296606 A CN 104296606A CN 201410423989 A CN201410423989 A CN 201410423989A CN 104296606 A CN104296606 A CN 104296606A
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Abstract
The invention discloses a laser fuse reception system, which comprises a reception optical unit, a photoelectric detector connected to the reception optical unit, a preposition amplification circuit connected to the photoelectric detector, and a distance gain control circuit connected to an output terminal of the preposition amplification circuit. According to the invention, the photoelectric detector and the preposition amplification circuit arranged in the reception system, a photoelectric crosstalk problem can be solved; the distance gain control circuit is arranged, so that signal filtering and distance gaining functions can be increased, problems of large laser fuse view field and long effect distance can be solved, and reception rate is increased.
Description
Technical field
The present invention relates to laser fuze field, be specifically related to a kind of laser fuze receiving system.
Background technology
The receiving system of laser fuze needs to convert the optical signal of reception to the signal of telecommunication, after amplification and shaping, give late-class circuit.
Domestic You Duojia unit Study of Laser fuse.But be substantially only limitted to algorithm research and modeling, and be the research for naval vessels, target that helicopter equal-volume is larger, and be almost blank for the research of the laser fuze of 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 within the scope of bullet 360 °, axle.Receiving system domestic at present, have and adopt avalanche photo diode (APD), photomultiplier and PIN silicon detection system, but its bias voltage of APD detector is very high, and photomultiplier belongs to external excitation volume very greatly, all cannot meet the receiving system requirement of miniaturized efficient laser fuze.Use the receiving system of PIN silicon detector to be relatively applicable to laser fuze, but current domestic existing system photosurface of the same type is of a size of 1.5mm × 15mm, cannot meet small form factor requirements.
Summary of the invention
The object of the present invention is to provide a kind of laser fuze receiving system, by arranging photodetector, pre-amplification circuit in receiving system, solving 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 large, operating distance is far away, 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 receiving system, be characterized in, this receiving 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 output 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 output of described pre-amplification circuit;
Gain control circuit, the first input end of described gain control circuit is connected with the output of described pre-amplification circuit, and the second input of this gain control circuit is connected with the output of this gain control circuit; The output 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 output of described main amplifier.
Preferably, described pre-amplification circuit comprises:
Power supply, and the resistance RL, resistance R1, the resistance R2 that are connected with described power supply respectively;
The other end of described resistance RL is connected successively with the base stage of electric capacity C1, triode BG1, and the emitter-base bandgap grading of described triode 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 the collector of described triode BG1, the base stage of triode BG2 respectively;
The other end of described resistance R2 is connected with the collector of described triode BG2, electric capacity C2 respectively, and the other end of described electric capacity C2 is the output of described pre-amplification circuit;
The emitter-base bandgap grading of described triode BG2 is connected successively with resistance R5, resistance R6, the other end ground connection of described resistance R6;
One end of resistance R4 is connected with the collector of described triode 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, respectively connected first signal processing circuit, secondary signal treatment circuit, Dolby circuit; The output of described multiplier and the connection of described main amplifier.
Preferably, described first signal processing circuit comprises: electric capacity C11, resistance R11 and diode D1;
The output of described pre-amplification circuit is connected rear ground connection successively with described electric capacity C11, resistance R11, and described diode D1 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 treatment circuit comprises: resistance R9, resistance R10 and electric capacity C21;
Outer distance gate signal end and described resistance R9, electric capacity C21 are connected and ground connection successively, 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 is connected with the X2 input of described resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and described multiplier respectively; The described resistance R14 other end, the electric capacity C22 other end, the electric capacity C24 other end be 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; Output and described resistance R15, the resistance R16 of described multiplier are connected and ground connection successively; The Z input of this multiplier is connected between described resistance R15, resistance R16.
The present invention compared with prior art has the following advantages:
The present invention, by designed in conjunction to photodetector, pre-amplification circuit, solves photoelectricity cross-interference issue, in the substantially distortionless situation of guarantee output signal, the frequency response bandwidth of pre-amplification circuit is controlled, 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 large, operating distance is far away, improve receiving efficiency.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of a kind of laser fuze receiving system of the present invention.
Fig. 2 is the local circuit schematic diagram of a kind of laser fuze receiving system of the present invention.
Fig. 3 is the circuit diagram of the gain control circuit of a kind of laser fuze receiving system of the present invention.
Fig. 4 is one of embodiment schematic diagram of a kind of laser fuze receiving system of the present invention.
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 shown in Figure 1, a kind of laser fuze receiving system, this receiving system comprises: receive optical unit 10, photodetector 20, pre-amplification circuit 30 and distance gain control circuit 40.
Photodetector 20 is connected with reception optical unit 10; Pre-amplification circuit 30 is connected with photodetector 20; The input of distance gain control circuit 40 is connected with the output 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 triode can be used as pre-amplification circuit, and its bandwidth requirement and noise can meet the demands.The application adopts two-stage common-emitter transistor to be designed to pre-amplification circuit 30.
As shown in Figure 2, pre-amplification circuit 30 comprises: power supply, and the resistance RL be connected with power supply respectively, resistance R1, resistance R2.The other end of resistance RL is connected successively with the base stage of electric capacity C1, triode BG1, and the emitter-base bandgap grading of triode BG1 is connected with resistance R3, the other end ground connection of resistance R3.The other end of resistance R1 is connected with the collector of triode BG1, the base stage of triode BG2 respectively.The other end of resistance R2 is connected with the collector of triode BG2, electric capacity C2 respectively, and the other end of electric capacity C2 is the output of pre-amplification circuit 30.The emitter-base bandgap grading of triode BG2 is connected successively with resistance R5, resistance R6, the other end ground connection of resistance R6; One end of resistance R4 is connected with the collector of triode 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, is that responsiveness reaches 0.5A/W ~ 0.6A/W, and the response time is several nanosecond because silicon PIN type detector is when λ=900nm, and dark current is only tens and receives peace, the designing requirement of the present invention of its characteristic conforms.
The pre-amplification circuit that two-staged transistor BG1, BG2 are set up is common-emitter configuration, and existing current gain, has voltage gain again.What photodetector 20 added is reverse bias, after illumination reversing the current increase, this reversing the current and incident optical power linear.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.
Differential is carried out to above formula, obtains:
Above formula gives the relational expression of bias voltage, load resistance and signal, and as RL=RD, Δ US has maximum.But in specific design, consider the impact of noise coefficient etc., it is excessive that the value of RL can not be got.
Then the output voltage of pre-amplification circuit 30 is:
The amplification coefficient of k--pre-amplification circuit.
As 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 output of pre-amplification circuit 30; The first input end of gain control circuit 42 is connected with the output of pre-amplification circuit 30, and the output 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 output of main amplifier 41.
As shown in Figure 3, gain control circuit 42 comprises: multiplier 421, respectively connected first signal processing circuit 422, secondary signal treatment circuit 423, Dolby circuit 424.The output of multiplier 421 and the connection of main amplifier 41.
First signal processing circuit 422 comprises: electric capacity C11, resistance R11 and diode D1.The output of pre-amplification circuit 30 is connected rear ground connection successively with electric capacity C11, resistance R11, and diode D1 is connected in parallel to resistance R11 two ends; The X1 input of multiplier 421 is connected between electric capacity C11, resistance R11.
Secondary signal treatment circuit 423 comprises: resistance R9, resistance R10 and electric capacity C21.Outer distance gate signal end and resistance R9, electric capacity C21 are connected and ground connection successively, and resistance R10 is connected in parallel to electric capacity C21 two ends; The Y1 input of multiplier 421 is connected between described electric capacity C21, resistance R9.
In the present invention, external motor passes through the secondary signal treatment circuit 423 of transmission range gate signal to gain control circuit 42.
Dolby circuit 424 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 is connected with the X2 input of resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and multiplier 421 respectively; The resistance R14 other end, the electric capacity C22 other end, the electric capacity C24 other end be 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; Output and described resistance R15, the resistance R16 of described multiplier 421 are connected and ground connection successively; The Z input of this multiplier 421 is connected between described resistance R15, resistance R16.
As shown in Figure 3, model is selected to be that the multiplier of AD835AN is as multiplier 421 in the present invention.The Y2 input end grounding of multiplier 421.The utilization principle of this multiplier 421 is as follows:
X=X1-X2；
Y=Y1-Y2；
W=K·（X·Y+Z）；
Wherein, X1 is the X1 input of multiplier 421, and X2 is the X2 input of multiplier 421, Y1 is the Y1 input of multiplier 421, and Y2 is the Y2 input of multiplier 421, and Z is the Z input of multiplier 421, K be multiplier 421 multiplication factor, W is the output of multiplier 421.
According to the output signal of above formula computing photodetector 20, ride gain is rule over time, although make in-plant echo-signal return soon, ride gain is very little, and remote echo-signal returns slowly, and ride gain increases gradually.So just to in-plant cloud layer signal attenuation, and target echo signal at a distance can be amplified.
As shown in Figure 4, external motor by transmission range gate signal time wide be 150ns, range gate is carried out integration by gain control circuit 42, obtain a time gain progressively increased with distance increase gain and control oblique line, the output signal of pre-amplification circuit 30 and time gain are controlled oblique line and are multiplied by main amplifier 41, export bells to voltage comparator 43.The signal of signal distance by reduction that respective distances is near will increase.Become large to make the gain difference of low coverage and long distance, differential process can be carried out to the 50ns signal that enlarge leadingly exports, become the width of about 10ns, so mainly use forward position instead of the pulse width of echo, the temporal resolution of low coverage and long distance can be made higher.
In the present invention, require mainly to comprise high-gain, broadband and adjustable gain to the selection of main amplifier 41.In the present embodiment, AD603 or AD8369 chip is adopted to be used as main amplifier 41; MAX903 chip is adopted to be used as voltage comparator 43.
A kind of laser fuze receiving system of the present invention, in actual use, specific works principle is as follows:
Receive optical unit 10 and receive optical echo signal, and this optical echo signal is carried out integrating, being polymerized, make the optical signal after processing carry out conversion by photodetector 20 and become the signal of telecommunication, this signal of telecommunication carries out amplification process through pre-amplification circuit 30, signal after process processes through distance gain control circuit 40, exports corresponding TTL pulse signal for late-class circuit process.
The present invention is through experimental verification, and the responsiveness of photodetector 20, pre-amplification circuit 30 reaches 2 × 10
5v/W, sensitivity reaches 250nW, and the rate of climb is 18ns, and volume is only φ 15mm × 5mm.
The square-wave signal exported through laser fuze receiving system is 100mV, and repetition rate is 10kHz.Acquisition test result is as follows:
For the system that pulsewidth is narrower, the successful of time-varying gain control improves, and signal amplitude is changed smooth-out, is conducive to the Linear Control of strong signal.This laser fuze receiving system makes the forward position of signal become relatively stable, improves range accuracy.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a laser fuze receiving system, is characterized in that, this receiving 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 output of described pre-amplification circuit (30).
2. laser fuze receiving system as claimed in claim 1, is characterized in that, described distance gain control circuit (40) comprises:
Main amplifier (41), the first input end of described main amplifier (41) is connected with the output of described pre-amplification circuit (30);
Gain control circuit (42), the first input end of described gain control circuit (42) is connected with the output of described pre-amplification circuit (30), and second input of this gain control circuit (42) is connected with the output of this gain control circuit (42); The output 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 output of described main amplifier (41).
3. laser fuze receiving system as claimed in claim 1, it is characterized in that, described pre-amplification circuit (30) comprises:
Power supply, and the resistance RL, resistance R1, the resistance R2 that are connected with described power supply respectively;
The other end of described resistance RL is connected successively with the base stage of electric capacity C1, triode BG1, and the emitter-base bandgap grading of described triode 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 the collector of described triode BG1, the base stage of triode BG2 respectively;
The other end of described resistance R2 is connected with the collector of described triode BG2, electric capacity C2 respectively, and the other end of described electric capacity C2 is the output of described pre-amplification circuit (30);
The emitter-base bandgap grading of described triode BG2 is connected successively with resistance R5, resistance R6, the other end ground connection of described resistance R6;
One end of resistance R4 is connected with the collector of described triode 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.
4. laser fuze receiving system as claimed in claim 3, it is characterized 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).
5. laser fuze receiving system as claimed in claim 4, it is characterized in that, described photodetector (20) is silicon PIN type detector, and the negative pole of this photodetector (20) is arranged between described resistance RL and electric capacity C1, the plus earth of this photodetector (20).
6. laser fuze receiving system as claimed in claim 1, it is characterized in that, described gain control circuit (42) comprises:
Multiplier (421), respectively connected first signal processing circuit (422), secondary signal treatment circuit (423), Dolby circuit (424);
The output of described multiplier (421) and the connection of described main amplifier (41).
7. laser fuze receiving system as claimed in claim 6, it is characterized in that, described first signal processing circuit (422) comprises: electric capacity C11, resistance R11 and diode D1;
The output of described pre-amplification circuit (30) is connected rear ground connection successively with described electric capacity C11, resistance R11, and described diode D1 is connected in parallel to described resistance R11 two ends; The X1 input of described multiplier (421) is connected between described electric capacity C11, resistance R11.
8. laser fuze receiving system as claimed in claim 6, it is characterized in that, described secondary signal treatment circuit (423) comprises: resistance R9, resistance R10 and electric capacity C21;
Outer distance gate signal end and described resistance R9, electric capacity C21 are connected and ground connection successively, and described resistance R10 is connected in parallel to described electric capacity C21 two ends; The Y1 input of described multiplier (421) is connected between described electric capacity C21, resistance R9.
9. laser fuze receiving system as claimed in claim 6, it is characterized in that, described Dolby circuit (424) 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 is connected with the X2 input of described resistance R13 one end, resistance R14 one end, electric capacity C22 one end, electric capacity C24 one end and described multiplier (421) respectively; The described resistance R14 other end, the electric capacity C22 other end, the electric capacity C24 other end be ground connection respectively; The described resistance R13 other end is connected with outside second reference voltage end.
10. laser fuze receiving system as claimed in claim 6, it is characterized in that, described gain control circuit (42) also comprises: resistance R15, resistance R16;
Output and described resistance R15, the resistance R16 of described multiplier (421) are connected and ground connection successively; The Z input of this multiplier (421) is connected between described resistance R15, resistance R16.
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| CN201410423989.7A CN104296606B (en) | 2014-08-26 | 2014-08-26 | A kind of laser fuze receives system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486180A (en) * | 2015-12-15 | 2016-04-13 | 西安电子科技大学 | Laser-fuze near-field return wave power calculation based on wave beam decomposition and partial irradiation |
| CN105509578A (en) * | 2015-11-19 | 2016-04-20 | 上海无线电设备研究所 | Multi-channel laser fuse for all-direction detection and method for all-direction detection |
| CN105988121A (en) * | 2015-03-03 | 2016-10-05 | 欧鹏 | Signal processing system for identification friend or foe (IFF) transponder |
| CN106341088A (en) * | 2016-09-05 | 2017-01-18 | 中国科学院高能物理研究所 | Current pre-amplifier, time resolution reading circuit and time resolution detection device |
| CN106374854A (en) * | 2016-09-05 | 2017-02-01 | 中国科学院高能物理研究所 | Current pre-amplifier, time resolution reading circuit and time resolution 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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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988121A (en) * | 2015-03-03 | 2016-10-05 | 欧鹏 | Signal processing system for identification friend or foe (IFF) transponder |
| CN105509578A (en) * | 2015-11-19 | 2016-04-20 | 上海无线电设备研究所 | Multi-channel laser fuse for all-direction detection and method for all-direction detection |
| 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 |
| CN105486180A (en) * | 2015-12-15 | 2016-04-13 | 西安电子科技大学 | Laser-fuze near-field return wave power calculation based on wave beam decomposition and partial irradiation |
| CN106341088A (en) * | 2016-09-05 | 2017-01-18 | 中国科学院高能物理研究所 | Current pre-amplifier, time resolution reading circuit and time resolution detection device |
| CN106374854A (en) * | 2016-09-05 | 2017-02-01 | 中国科学院高能物理研究所 | Current pre-amplifier, time resolution reading circuit and time resolution 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 |
| 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 |
| 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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