CN105068059B - A kind of photoelectric signal process equipment of laser guidance system - Google Patents
A kind of photoelectric signal process equipment of laser guidance system Download PDFInfo
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- CN105068059B CN105068059B CN201510431000.1A CN201510431000A CN105068059B CN 105068059 B CN105068059 B CN 105068059B CN 201510431000 A CN201510431000 A CN 201510431000A CN 105068059 B CN105068059 B CN 105068059B
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- resistance
- photoelectric signal
- photodetector
- processing circuit
- signal processing
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The invention discloses a kind of photoelectric signal process equipment of laser guidance system, including return laser beam receiving unit, photodetector, photoelectric signal processing circuit and filter connector；The input of photodetector is connected to the output end of return laser beam receiving unit, and the input of photoelectric signal processing circuit is connected to the output end of photodetector；The input of filter connector is connected to the output end of photoelectric signal processing circuit.The present invention has strong antijamming capability, and wide dynamic range can effectively reduce the even-order harmonic in signal transmission and reduce the good electrical characteristic such as distortion；Return laser beam receiving unit, photodetector, optical mount and filter connector are combined together simultaneously, a metal enclosed space is constituted；Photodetector output voltage signal is sent into by photoelectric signal processing circuit with most short transmission path, it is to avoid the noise jamming of external environment condition.
Description
Technical field
The invention belongs to laser guidance technique field, at a kind of photosignal of laser guidance system
Manage device.
Background technology
In semi-active laser guidance system, target bearing is detected usually using four-quadrant photo detector.When target hair
During raw skew, due to the change of radiation flux between quadrant, the photocurrent variations for causing each quadrant to export, 4 quadrant detector is defeated
The electric signal gone out also has corresponding change, and photosignal can obtain target angle angle value after a series of processing.So, photoelectricity
The processing of signal is most important, and its processing quality directly influences the precision of target angle angle value.
Laser echo signal receives by a series of optical mirror slips and is converted into four road electric signals by photodetector, leads to
Often, this four roads electric signal does not only pass through any filtering process even by simple RC filtering, and is not also done in structure
Good design considers, is fed to rear class signal processing circuit.In laboratory conditions, laser guidance system is in function for above-mentioned way
May be without too big problem in terms of test, when into testing performance index or field trial, photodetector is converted into
Four road electric signals be possible to introduce noise jamming, the measurement accuracy of angle on target value is finally influenced whether, in complex environment
It is lower even to lose target.
The content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of Photoelectric Signal Processing of laser guidance system
Device, it is intended to solve laser guidance system under complex environment poor anti jamming capability and cause the problem of measurement accuracy is low.
The invention provides a kind of photoelectric signal process equipment of laser guidance system, including return laser beam receiving unit,
Photodetector, photoelectric signal processing circuit and filter connector；The input of the photodetector is connected to the laser
The output end of echo reception unit, the input of the photoelectric signal processing circuit is connected to the output of the photodetector
End；The input of the filter connector is connected to the output end of the photoelectric signal processing circuit；The Photoelectric Signal Processing
Circuit includes：First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and amplifier；Described
One end of one resistance is as the input of the photoelectric signal processing circuit, and the other end of the first resistor passes through the described 3rd
Resistance is connected to the positive input of the amplifier, and the reverse input end of the amplifier passes through the 4th resistance eutral grounding；
The positive output end and negative output terminal of the amplifier as the photoelectric signal processing circuit output end；The second resistance connects
It is connected between the first resistor and the connection end and ground of the 3rd resistor；5th resistance is connected to the amplifier
Between the negative output terminal of positive input and the amplifier；6th resistance is connected to the reverse input end of the amplifier
Between the positive output end of the amplifier.The photoelectric signal processing circuit can be good at suppression common mode noise, anti-interference
Ability is strong, and has done good impedance matching design.
Further, the resistance of each resistance should meet following matching relationship in the photoelectric signal processing circuit：
Wherein, the resistance R of first resistor0=50 Ω, RAFor the resistance of the 4th resistance, RBFor the 5th resistance and the 6th resistance
Resistance, RYFor the resistance of second resistance, RXFor the resistance of 3rd resistor, k<1, G is the gain of amplifier.
Further, the photoelectric signal process equipment also include optical mount, the optical mount with
The return laser beam receiving unit is fixed and is seamlessly connected.
Further, the photodetector is arranged on the afterbody of the return laser beam receiving unit, the optical telecommunications
Number process circuit is welded on the photodetector, the return laser beam receiving unit, the photodetector, the optics
System frame and the filter connector constitute a metal enclosed space.
Further, the optical mount includes the first fastening screw, the second fastening screw, cylinder barrel, bottom
Seat and square hole；The cylinder barrel is open to the left, and is provided with opening on annular table top, annular table top and is provided with four
First fastening screw；The cylinder barrel and the integrated setting of the base, in being provided centrally with for pacifying for the base
The square hole of the filter connector is filled, the second fastening screw is used to fasten the filter connector.
The present invention have strong antijamming capability, wide dynamic range, can effectively reduce signal transmission in even-order harmonic and
Reduce the good electrical characteristics such as distortion；Simultaneously by return laser beam receiving unit, photodetector, optical mount and filter
Ripple connector is combined together, and constitutes a metal enclosed space；Photodetector is exported by electricity with most short transmission path
Press signal feeding photoelectric signal processing circuit, it is to avoid the noise jamming of external environment condition.
Brief description of the drawings
Fig. 1 is that single ended input provided in an embodiment of the present invention turns differential output circuit.
Fig. 2 is the equivalent transformation process of single ended signal provided in an embodiment of the present invention.
Fig. 3 is the equivalent circuit that single ended input provided in an embodiment of the present invention turns differential output circuit.
Fig. 4 is the photoelectric signal process equipment view in full section of laser guidance system provided in an embodiment of the present invention.
Fig. 5 is photoelectric signal processing circuit plate plane structure chart provided in an embodiment of the present invention.
Fig. 6 is optical mount structure chart provided in an embodiment of the present invention, and Fig. 6 (a) is left view, and Fig. 6 (b) is main view
View in full section, Fig. 6 (c) is right view.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention relates to a kind of photoelectric signal process equipment of laser guidance system, it has strong antijamming capability, dynamic
Scope is wide, can effectively reduce the even-order harmonic in signal transmission and reduce the good electrical characteristic such as distortion, then coordinate ingenious
Structure design, and then make photosignal is almost undistorted to be transferred to rear class signal processing circuit.
For not enough or Improvement requirement of the prior art, it is an object of the invention to provide a kind of processing of photosignal
Device.Strong antijamming capability is made it have, wide dynamic range can effectively reduce the even-order harmonic in signal transmission and reduce mistake
The good electrical characteristic such as very, then coordinate cleverly structure design, and then make photosignal is undistorted to be transferred to rear class processing
Circuit.
To achieve the above object, the present invention has done optimization design at two aspects of circuit and structure：
(1) in terms of circuit design, when laser guidance system distance objective farther out when, the energy that photodetector is received
It is very faint, so that the voltage signal very little of photodetector output, it is easy to by extraneous noise jamming, if photoelectricity is visited
The voltage signal magnitude for surveying device output is less than the amplitude of noise, that is, is submerged among noise, then guidance system just can not
Target is captured, so as to influence its operating distance.Under normal circumstances, even if the voltage signal magnitude of photodetector output is big
The measurement accuracy of target angle angle value can be equally influenceed in the noise jamming of the amplitude of noise, but higher magnitude.
Above-mentioned consideration is based on, the present invention devises a kind of single ended input slip point in the rear end that photodetector is exported
The photoelectric signal processing circuit of output, and it is made that accurately impedance matching analysis with calculating；Difference output rear end is provided with tool
There are filtering and the low pass filter and magnetic bead of anti-interference function；Photoelectric signal processing circuit is strictly pressed when PCB layout is connected up
Carried out according to placement-and-routing's rule on single-ended transfer difference amplifier databook.
(2) complexity of laser guidance system working environment is directed to, to make it have stronger antijamming capability, in structure
Design aspect, the present invention is cleverly by return laser beam receiving unit, photodetector, optical mount and filter connector
It is combined together, constitutes a metal enclosed space.Photodetector is arranged on photoelectric signal processing circuit and is integrated,
Photodetector output voltage signal is sent into by photoelectric signal processing circuit with most short transmission path, entirety is combined into and is put into metal
The space of closing, it is to avoid the noise jamming of external environment condition.
The present invention is further described below in conjunction with the accompanying drawings.
The present invention devises a kind of single ended input in the rear end that photodetector is exported and turned at the photosignal of difference output
Circuit is managed, and is made that accurately impedance matching analysis with calculating.
In high-frequency amplifier circuit, impedance matching is especially particular about.Require that not occurring resistance on signal path dashes forward in impedance matching
Become, also in the absence of resistance, and transmission line equiva lent impedance is generally 50 Ω or 75 Ω, be clipped in prime output and suffix input
Between.So, in most cases, the output impedance of signal source or preamplifying circuit is typically chosen as 50 Ω, so as to transmission
The resistance such as line, and the input impedance of rear class amplifying circuit also must be 50 Ω, with transmitting lines matching.
Design single ended input turns differential output circuit, it is necessary to assure following to require：
First：Signal source has R0=50 Ω output impedance, therefore it must be also 50 Ω that circuit, which enters the input impedance at end,.
As in Fig. 1, it is necessary to assure from uyThe amplifier input resistance R seen at mark point1For 50 Ω；
Second：Two branch roads are symmetrical up and down, to realize Differential Output, mark point uyThe signal output resistance R at place3, plus
Upper RX, it should just equal to the R in equivalent circuit diagram shown in Fig. 3A。
So, it is 50 Ω in signal source output resistance, it is necessary to select R in the case of setting gain as GA、RB、RX、RY, with
Input resistant matching is met, symmetrical above and below, overall gain is G requirement.This seems have a difficulty, most of sides using estimation
Method, but this evaluation method is not rigorous, it is impossible to ensure output signal symmetry.
If the method according to equation is solved is solved, accurate resistance can be obtained, suitable E96 is selected on this basis
Series resistance, it is possible to achieve preferably design.
The single-ended signal u that known input exports for photodetectori, and with R0=50 Ω output impedance, by it
It is changed into differential output signal, gain is G times, i.e. uout+-uout-=Gui, and output is symmetrical, meets input impedance matching requirement.
Analysis process：Single ended input turns differential output circuit as shown in figure 1, wherein R firstA、RB、RX、RYTo wait to ask electricity
Resistance.To meet input impedance matching requirement, uyPlace's signal magnitude should be 0.5ui。
Secondly, input signal ui, photodetector output impedance R0=50 Ω and RYThe input circuit of composition, by electricity
Power supply equivalent transformation in the principle of road, as shown in figure 3, being transformed to connecting for an equivalent voltage source and resistance, greatly
Facilitate the analysis and solution of circuit shown in Fig. 1.
Input circuit is after the equivalent transformation shown in Fig. 2, and Fig. 1 circuit reductions are circuit shown in Fig. 3.Shown in Fig. 2
During equivalent transformation, there is an interim coefficient k, it is clear that：
Kirchhoff electric current principle (KCL) in circuit theory, equivalent circuit as shown in Figure 3 can be obtained：
Upper two formula of solution, can be obtained：
Defined according to input impedance, u in Fig. 1 and Fig. 3 can be obtainedyPoint signal should be 0.5ui, so that：
By R3=50k is substituted into, and by uiDisappear
(4) formula is substituted into, if RA=x, after arrangement
Thus it can solve：
In formula (6), RA0 must be greater than, otherwise needs to reset RB。
Thus using formula (4), obtaining k, (k need to be less than 1, otherwise reset RB), further according to formula (1), solve
Recycling formula (2), is solved
RX=RA-50k (8)
The voltage signal range exported due to photodetector is from tens millivolts to 4V or so, and in Photoelectric Signal Processing
Circuit need not compress photosignal, hence, it can be determined that gain G=1, common mode input VOCM=0V.The single-ended transfer difference of selection
Amplifier is AD8132, according to its databook, can select RB=1000 Ω.
R can be calculated according to formula (4)~(8)A=381.5789 Ω, RX=362.5 Ω, RY=30.851 Ω.
According to E96 ohmmeters, R is selectedA=381 Ω, RX=365 Ω, RY=30.1 Ω.
For the complexity of laser guidance system working environment, to make it have stronger antijamming capability, set in structure
In terms of meter, the present invention is cleverly by return laser beam receiving unit, photodetector, optical mount and filter connector knot
It is combined, constitutes a metal enclosed space.It is illustrated in figure 4 a kind of photosignal of laser guidance system of the present invention
Processing unit view in full section, including return laser beam receiving unit 1, photodetector 2, photoelectric signal processing circuit 3, optical system branch
Frame 4 and filter connector 5.Photodetector 2 is arranged on the afterbody of return laser beam receiving unit 1；Photoelectric signal processing circuit 3
It is welded on photodetector 2, photodetector output voltage signal is sent into by Photoelectric Signal Processing with most short transmission path
Circuit, while photodetector 2 and photoelectric signal processing circuit 3 to be fixed on to the afterbody of return laser beam receiving unit 1 with screw；
Then return laser beam receiving unit 1 carries out slitless connection with optical mount 4, and is fastened with screw；Finally, at photosignal
The power supply and output signal for managing circuit 3 are docked by filter connector 5 with external signal process plate；Ultimately form an envelope
Space where the metal space closed, i.e. photoelectric signal processing circuit, it is to avoid the noise jamming of external environment condition.
The plane structure chart of photoelectric signal processing circuit plate 3 is as shown in figure 5, wherein 31 be Photoelectric Signal Processing in the present invention
Four fastening screws of circuit board, 32 be two fastening screws of photodetector, and photodetector is output as 13 pins, and this 13
Root pin through 13 welding holes 33 on photoelectric signal processing circuit plate, most at last photodetector welded and installed in photosignal
On process circuit plate.
The structure chart of optical mount 4 of the present invention is as shown in fig. 6, Fig. 6 (a) is left view, and Fig. 6 (b) is main view
View in full section, Fig. 6 (c) is right view.Optical mount 4 includes the first fastening fastening of screw 41, second screw 42, cylinder barrel
43rd, base 44 and square hole 45；Wherein, optical mount is steel construction, and does oxidation processes；43 in Fig. 6 (b) be optical system
Without any perforate on the cylinder barrel of system support, barrel；Cylinder barrel is open to the left, there is annular table top, annular at opening
There are four first fastening screws 41 on table top；The base 44 of cylinder barrel 43 and optical mount be it is integral, base 44
Square hole 45 is dug out at center to be used to install filter connector, and the second fastening screw 42 is used to fasten filter connector.
The structural member afterbody of return laser beam receiving unit 1 of the present invention enters with the annular table top of optical mount 44
Row slitless connection, and screw fastening is carried out using four first fastening screws 41 in Fig. 6 on annular table top, while installing simultaneously
Filter connector is fastened, finally, the left and right of cylinder barrel 43 is all shut in Fig. 6 (b), constitute the metal space of a closing.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (3)
1. a kind of photoelectric signal process equipment of laser guidance system, it is characterised in that including return laser beam receiving unit (1),
Photodetector (2), photoelectric signal processing circuit (3) and filter connector (5)；
The input of the photodetector (2) is connected to the output end of the return laser beam receiving unit (1), the optical telecommunications
The input of number process circuit (3) is connected to the output end of the photodetector (2)；The input of the filter connector (5)
End is connected to the output end of the photoelectric signal processing circuit (3)；
The photoelectric signal processing circuit (3) includes：First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance and amplifier；
One end of the first resistor as the photoelectric signal processing circuit (3) input, the first resistor it is another
End is connected to the positive input of the amplifier by the 3rd resistor, and the reverse input end of the amplifier passes through described
4th resistance eutral grounding；The positive output end and negative output terminal of the amplifier as the photoelectric signal processing circuit (3) output
End；
The second resistance is connected between the first resistor and the connection end and ground of the 3rd resistor；
5th resistance is connected between the negative output terminal of the positive input of the amplifier and the amplifier；
6th resistance is connected between the positive output end of the reverse input end of the amplifier and the amplifier；The light
Electric signal process unit also includes optical mount (4), the optical mount (4) and the return laser beam receiving unit
(1) fixed and seamless connection；
The photodetector (2) is arranged on the afterbody of the return laser beam receiving unit (1), the photoelectric signal processing circuit
(3) it is welded on the photodetector (2), the return laser beam receiving unit (1), the photodetector (2), the light
Learn system frame (4) and the filter connector (5) constitutes a metal enclosed space.
2. photoelectric signal process equipment as claimed in claim 1, it is characterised in that in the photoelectric signal processing circuit (3)
The resistance of each resistance should meet following matching relationship：
C=-0.5RB；RX=
RA- 50k,
Wherein, the resistance R of first resistor0=50 Ω, RAFor the resistance of the 4th resistance, RBFor the resistance of the 5th resistance and the 6th resistance
Value, RYFor the resistance of second resistance, RXFor the resistance of 3rd resistor, k ＜ 1, G is the gain of amplifier.
3. the photoelectric signal process equipment as described in claim any one of 1-2, it is characterised in that the optical mount
(4) the first fastening screw (41), the second fastening screw (42), cylinder barrel (43), base (44) and square hole (45) are included；
The cylinder barrel (43) is open to the left, and is provided with opening on annular table top, annular table top and is provided with four
First fastening screw (41)；The cylinder barrel (43) and the integrated setting of the base (44), in the base (44)
The square hole (45) for being used to install the filter connector (5) is provided centrally with, the second fastening screw (42) is used to fasten institute
State filter connector (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510431000.1A CN105068059B (en) | 2015-07-22 | 2015-07-22 | A kind of photoelectric signal process equipment of laser guidance system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510431000.1A CN105068059B (en) | 2015-07-22 | 2015-07-22 | A kind of photoelectric signal process equipment of laser guidance system |
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| Publication Number | Publication Date |
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| CN105068059A CN105068059A (en) | 2015-11-18 |
| CN105068059B true CN105068059B (en) | 2017-10-24 |
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