CN1624493A - Laser aiming device in free space optical communication system - Google Patents
Laser aiming device in free space optical communication system Download PDFInfo
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- CN1624493A CN1624493A CN 200310107737 CN200310107737A CN1624493A CN 1624493 A CN1624493 A CN 1624493A CN 200310107737 CN200310107737 CN 200310107737 CN 200310107737 A CN200310107737 A CN 200310107737A CN 1624493 A CN1624493 A CN 1624493A
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Abstract
A laser aimer of free special optical communication system comprises of modulation beacon light source, receiving optical wire antenna, position sensor, signal processor, interface circuit and computer. The laser beam is generated in the light source on one end of communication link formed of a pair of free special optical communication system, then it irradiates on another end of another free special optical communication system; facula which contains information of the relative position and special angle of the two ends of the system is formed by the system comprising of narrow band filter and imaging lens receiving optical antenna which focuses on the position sensor and photosurface ; the power of facula is changed into electric signal by position sensor and is entered into the electric signal processor to be reprocessed, passed to the computer which will calculate the accurate position and special angle of the two ends. The invention has simple structure, small volume and light weight, high accuracy and fast speed.
Description
Affiliated technical field
The present invention relates to a kind of tracking and sighting device that utilizes laser.Relate in particular to free space laser communication (Free SpaceOptical, FSO) or wireless light communication (Wireless Optical Communication, WOC) the laser transmitting-receiving system at two ends aims at and tracking means mutually.
Background technology
At present, existing multiple method is used for the aiming of receive-transmit system at free space optical communication or wireless light communication two ends and position correction, and as the telescope of blocking of shooting usefulness, but its field angle and sighting range are limited, can not operate automatically, need with artificial.Adopt the four-quadrant photoelectric device to follow the tracks of, there is the blind area in central point, and error is bigger.Use linear array CCD camera, need the optical scanning mechanism of bulky complex.By Array CCD Camera the image space of corner reflector in the ccd video camera field angle being calculated cooperative target is matter and dimensional orientation, and the ccd video camera number of pixels limits the resolution of measurement.The computer information processing amount is bigger, and measuring speed is slow, and unappeasable free-space optical communication system communication chain two ends are aimed at rapidly and adjusted, and guarantees the requirement of communication quality.Volume and weight is bigger, uses inconvenient.
At present, the laser sight of domestic still useless position sensor composition is applied to report, article and the patent at the communication chain two ends of free-space optical communication system composition.Abroad, up-to-date report is the position that has, the most of intersection docking technique document with aerospacecraft of position sensor.
Summary of the invention
The objective of the invention is to overcome above-mentioned shortcoming, a kind of satisfy the receive-transmit system fast precise aiming at free-space optical communication system communication chain two ends and the laser aid of following the tracks of are provided.
For achieving the above object, the technical solution used in the present invention is the laser beam irradiation that sends of the modulation beacon light source of an end of the communication chain that constitutes from a pair of free-space optical communication system another free-space optical communication system to the other end, receiving optical antenna by this system that is made up of narrow band pass filter and imaging len focuses on the photosurface of position sensor, generation comprises the relative position at two ends of free-space optical communication system and the hot spot of spatial attitude angle information, position sensor is an electric signal with the energy conversion of hot spot, be input to E-signal processor and carry out pre-service, be input to computing machine through interface circuit, calculate the exact position and the spatial attitude angle at two ends.
Advantage of the present invention is:
1, convenient data processing is a kind of precision height, measuring speed fast full-automatic short range range finding, angle-measuring equipment.
2, the large-area rectangle of even resistance or four electrodes on four limits of square position sensor are arranged, the electric current that each electrode flowed out comprises the precise information of luminous point position.Calculated amount is little, and computing velocity is fast.
3, light spot position is subjected to the restriction of position resolution hardly, the measuring accuracy height.There is not the centrocecal scotoma restriction of four-quadrant device.
4, can the Measuring Object position rate, can distinguish different cooperative targets, measure in the time of can be to several cooperative target.
5, improved the ability of wiping out background light and scattered light, antijamming capability is strong.
6, simple in structure, volume and weight is less.
7, can accurately revise the data drift that temperature causes by error correction, temperature stabilization is good, and is not influenced by ambient temperature.
8, applied range also can relate to the intersection butt joint of aerospacecraft, robotic vision system, and industrial on-line monitoring, all need the place of accurate measuring position the experiment measuring of wind-tunnel and ccd video camera monitoring objective position etc.
Description of drawings
Fig. 1 is the block diagram of laser sight integral body
Fig. 2 is the circuit theory diagrams of modulation beacon light source and the timing waveform of modulation
Fig. 3 is the synoptic diagram that receives optical antenna and position sensor combination
Fig. 4 is the signaling conversion circuit figure of position sensor signal post-processing
Fig. 5 is the port address decoding scheme of interface circuit
Fig. 6 is D/A converting circuit figure
Specific embodiment
Below in conjunction with the accompanying drawing embodiments of the invention, be described in further detail.
By Fig. 1 to Fig. 5 as can be known, laser sight in a kind of free-space optical communication system is by modulation beacon light source 1, receive optical antenna 2, position sensor 3, signal processor 4, interface circuit 5 and computing machine 6 are formed, it is characterized in that laser beam irradiation that the modulation beacon light source 1 of an end of the communication chain that constitutes from a pair of free-space optical communication system sends receiving system to another free-space optical communication system of the other end, receiving optical antenna 2 by this system that is made up of narrow band pass filter and imaging len focuses on the photosurface of position sensor 3, generation comprises the relative position at two ends of free-space optical communication system and the hot spot of spatial attitude azimuth information, position sensor 3 is an electric signal with the energy conversion of hot spot, be input to E-signal processor 4 and carry out pre-service, be input to computing machine 6 through interface circuit 5, calculate the exact position and the spatial attitude angle at two ends.
Modulation beacon light source 1 is three laser instruments of arranging each other in equilateral triangle, chronologically on the reception optical antenna 2 of the laser pulses irradiate of sender's waveform before the position sensor 3.
The driving circuit of modulation beacon light source 1 adopts regularly square-wave generator as the drive source of laser instrument, produces three microsecond levels drive signal of the light emitting control of order at interval.
Form the laser facula that reception optical antenna 2 is focused into laser beam by narrow band pass filter and imaging len, spot center is on position sensor 3 photosurfaces, the light intensity of photosurface response spot center, realize opto-electronic conversion, comprise the current signal of positional information, spatial attitude angle and intensity information from four pin outputs of position sensor 3.
The electric current of signal processor 4 location sensitive devices 3 output is input to differential amplifier circuit through summing circuit, again through reverser be converted to-2.5V～+ the 2.5V voltage signal.
Interface circuit 5 handles for computing machine 6 through analog to digital conversion circuit output digital signal the voltage signal of electronic signal process part 4 outputs in 0～5v input voltage range.
Fig. 1 is the functional-block diagram of free-space optical communication system laser sight, modulation beacon light source 1 employing laser diode (Laser Diode-LD) among the figure or light emitting diode (Light Emitted Diode-LED) are placed on three one-tenth triangular arranged on the angle scale, by the emissive power of transmission range decision laser diode.Each light signal to light source carries out sequential coding, at any one constantly, has only a light source to open.The sequence synchronization of measuring and throwing light on, in order to eliminate the influence of bias light, interference filter wiping out background light at dual-mode antenna 2, imaging len focuses on the photosurface of position sensor 3, produce hot spot, the position of hot spot has comprised the relative position and the spatial attitude azimuth information at the two ends of free-space optical communication system, the energy conversion of hot spot is an electric signal, be input to signal processor 4 and carry out pre-service, be input to computing machine 6 through interface circuit 5, calculate the exact position and the spatial attitude angle at two ends.
Fig. 2 is the circuit theory diagrams of modulation beacon light source.Modulation beacon light source 1 is three laser instruments of arranging each other in equilateral triangle, on the optical transmitting and receiving antenna 2 of the square waveform laser pulses irradiate of sending chronologically before the position sensor 3.Adopt regularly square-wave generator as the drive source of laser instrument, the led control signal that produces three microsecond levels interval orders is given three laser instruments.Square-wave generator 7 employing 555 or other types timers produce a square wave through output terminal 3, are input to the C of the d type flip flop 8 that triggers three 74LS175 or other types
PEnd, output signal are input to 74LS11 and door 9, through " with " and the computing of " non-" after, it is in proper order luminous that the square-wave waveform that can produce three kinds of institute's sequential at 1,2,3 ends of 74LS06 reverse driven 10 removes to control light source.The light source luminescent sequential is spaced apart 1 microsecond.
Fig. 3 is the combination that receives optical antenna 2 and position sensor 3.The laser beam of irradiation is formed the laser facula that optical antenna is focused into through narrow band pass filter 11 and imaging len 12, its center is on the throne puts on the sensor photosurface 3, what photosurface responded is the light intensity of spot center, realize the opto-electronic conversion of beacon beam signal, comprise the current signal of positional information, spatial attitude position angle and intensity information from four pin outputs of position sensor.If bias light is more intense, the available interference filter that is complementary with optical source wavelength reduces the intensity of bias light on position sensor, improves the signal to noise ratio (S/N ratio) of position sensing alignment clamp.Prevent that position sensor from reaching capacity.Position sensor receives light signal, after the realization opto-electronic conversion, from four pin output current signals.Change voltage signal into through converter 14 again.These four signals, wherein two is the x direction, two is the y direction in addition.Each signal has not only comprised the information of position and attitude angle, and is comprising the intensity signal of received luminous point.
Fig. 4 is the signaling conversion circuit figure of position sensor output current signal.The electric current of converter 14 location sensitive devices 3 output of electronic signal process part 4 carries out the current/voltage conversion through a series of linear amplifier 15, after the summation, is input to differential amplifier circuit, again through reverse conversion be-2.5V～+ the 2.5V voltage signal.At first four photo-signals exporting on the position sensor are converted to voltage signal (I/U conversion), then these correspondent voltage signals are sued for peace and the difference amplification.Owing to be subjected to the restriction of analog to digital converter (A/D conversion), the changing voltage of converter 14 must be limited between 0～5v.Therefore, four voltage U
1, U
2, U
3, U
4, should be limited in-2.5v～+ 2.5v between.This just need change.In the circuit each voltage is added+2.5v voltage, and decayed half, reverse then processing.
Fig. 5 is the port address decoding scheme of analog to digital conversion interface.The decoding scheme of A/D conversion port address is by code translator IC
1(74LS00) and IC
2(74LS30) and 3～8 line code translator IC
3(74LS138) form.This decoding scheme is subjected to PC IOW and IOP signal controlling.Only when carrying out the I/O read-write operation, this decoding scheme just works.
Fig. 6 is analog-to-digital circuit diagram.In 0～5v input voltage range, give computing machine 6 through analog to digital conversion circuit output digital signal with the voltage signal of electronic signal process part 4 outputs.Analog to digital conversion circuit (A/D circuit) adopts the ADC0809 integrated circuit (IC) that has 8 passages
6, input voltage range is 0～5v, adopts the inquiry working method.This circuit IC
7(74LS90) the clock signal clk frequency division with the PC expansion slot becomes the frequency that is fit to ADC0809 work.Sampling keeps by IC
4(74L123) finish.It triggers pin through not gate IC
5(74LS04) receive the START pin of ADC0809.When the CPU of computing machine started ADC0809, the positive voltage saltus step took place in START, triggers 74L123 simultaneously and enters hold mode.The EOC of ADC0809 is through not gate IC
8(74LS04) with the INT of the CPU of computing machine
1Connect, the assurance system is with inquiry mode work.The START of ADC0809 and OE pin through or, not gate IC
9P with the CPU of computing machine
2,7, WR, RD connect.Make three port address of this circuit, port address is allocated as follows:
278H is used to start ADC0809 and begins conversion.
279H is used to check that the A/D EOC is not.
27AH is used for sending permission output signal OE to ADC0809, so that data converted is taken away.
Send into the address with port address 278H as the ADC0809 enabling signal.Enabling signal is by data D
7The position produces, and channel signal is by D
0, D
1And D
2Produce.278H port address in elected, and D
7The position is 1 o'clock, then produces a negative saltus step via Sheffer stroke gate U, with this signal triggering monostalbe trigger, produces the starting impulse about about 1 microsecond of width, is used to start A/D and changes.Realize that this process can use following instruction sequence,, use D as to the sampling of 0 channel start
7The position produces 1～0 variation, to form a pulse that starts the A/D conversion.And D
2, D
1And D
0Remain unchanged.
Adopt inquiry mode, port address 279H is constantly carried out read operation, to determine whether conversion finishes, and works as D
7The position is 1 o'clock, the expression EOC, and available port address 27AH takes transformation result away, can adopt following instruction sequence:
To the output signal of other three position sensors, also be by identical port address decoding scheme.Be linked into A, B and the C of ADC0809 through three passages.
So just can pass to the output signal of position sensor by three generating lasers of computing machine, with poor (the comprising positional information and strength information) of the relevant position sensor output signal of the calculating of three right spot methods with and the merchant of (only comprising strength information), just can obtain positional information.Promptly can directly the relative position and the attitude of target be exported on graphoscope.
Claims (6)
1, laser sight in a kind of free-space optical communication system is by modulation beacon light source (1), receive optical antenna (2), position sensor (3), signal processor (4), interface circuit (5) and computing machine (6) are formed, it is characterized in that laser beam irradiation that the modulation beacon light source (1) of an end of the communication chain that constitutes from a pair of free-space optical communication system sends another free-space optical communication system to the other end, receiving optical antenna (2) by this system that is made up of narrow band pass filter and imaging len focuses on the photosurface of position sensor (3), generation comprises the relative position at two ends of free-space optical communication system and the hot spot of spatial attitude azimuth information, position sensor (3) is an electric signal with the energy conversion of hot spot, be input to signal processor (4) and carry out pre-service, be input to computing machine (6) through interface circuit (5), calculate the exact position and the spatial attitude angle at two ends.
2, according to the laser sight in the described free-space optical communication system of claim 1, it is characterized in that modulating beacon light source (1) is three laser instruments each other in the equilateral triangle arrangement, and the laser pulses irradiate of sender's waveform arrives on the preceding reception optical antenna (2) of position sensor (3) chronologically.
3, according to the laser sight in the described free-space optical communication system of claim 1, it is characterized in that the driving circuit of modulating beacon light source (1) adopts regularly square-wave generator as the drive source of laser instrument, produces three microsecond levels drive signal of the light emitting control of order at interval.
4, according to the laser sight in claim 1 and the 2 described free-space optical communication systems, it is characterized in that forming the laser facula that reception optical antenna (2) is focused into laser beam by narrow band pass filter and imaging len, spot center is on position sensor (3) photosurface, the light intensity of photosurface response spot center, realize opto-electronic conversion, comprise the current signal of positional information, spatial attitude angle and intensity information from four pin outputs of position sensor (3).
5, according to the laser sight in the described free-space optical communication system of claim 1, the electric current that it is characterized in that signal processor (4) location sensitive device (3) output is through summing circuit, be input to differential amplifier circuit, again through reverser be converted to-2.5V～+ the 2.5V voltage signal.
6, according to the laser sight in the described free-space optical communication system of claim 1, it is characterized in that interface circuit (5) in 0～5v input voltage range, handle for computing machine (6) through analog to digital conversion circuit output digital signal the voltage signal of signal processor (4) output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310107737 CN1624493A (en) | 2003-12-04 | 2003-12-04 | Laser aiming device in free space optical communication system |
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| CN 200310107737 CN1624493A (en) | 2003-12-04 | 2003-12-04 | Laser aiming device in free space optical communication system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454787C (en) * | 2006-04-14 | 2009-01-21 | 南京邮电大学 | Positioning and aligning apparatus and method for free space optical communication system antenna |
| CN101852924A (en) * | 2010-05-28 | 2010-10-06 | 西安理工大学 | Automatic light beam capturing device and light beam capturing method |
| CN102095099A (en) * | 2010-12-17 | 2011-06-15 | 北京控制工程研究所 | Rendezvous butt far-field marker lamp |
| CN101188458B (en) * | 2007-10-25 | 2011-07-20 | 中国科学院上海光学精密机械研究所 | Space pattern scanning laser communication method |
| CN102280000A (en) * | 2011-06-14 | 2011-12-14 | 常州第二电子仪器有限公司 | Laser alarm |
| CN102664676A (en) * | 2012-04-18 | 2012-09-12 | 中国科学院西安光学精密机械研究所 | Transmission and test system for signal-wavelength 3Gbps space high-speed light |
| CN108318890A (en) * | 2018-01-04 | 2018-07-24 | 西安理工大学 | A kind of aerosol detection radar system for making light source using white light LEDs |
| CN109600164A (en) * | 2018-12-26 | 2019-04-09 | 华中光电技术研究所（中国船舶重工集团有限公司第七七研究所） | For the quick guidance capturing method and system between moving platform free space optical communication machine |
-
2003
- 2003-12-04 CN CN 200310107737 patent/CN1624493A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454787C (en) * | 2006-04-14 | 2009-01-21 | 南京邮电大学 | Positioning and aligning apparatus and method for free space optical communication system antenna |
| CN101188458B (en) * | 2007-10-25 | 2011-07-20 | 中国科学院上海光学精密机械研究所 | Space pattern scanning laser communication method |
| CN101852924A (en) * | 2010-05-28 | 2010-10-06 | 西安理工大学 | Automatic light beam capturing device and light beam capturing method |
| CN102095099A (en) * | 2010-12-17 | 2011-06-15 | 北京控制工程研究所 | Rendezvous butt far-field marker lamp |
| CN102095099B (en) * | 2010-12-17 | 2013-01-23 | 北京控制工程研究所 | Rendezvous butt far-field marker lamp |
| CN102280000A (en) * | 2011-06-14 | 2011-12-14 | 常州第二电子仪器有限公司 | Laser alarm |
| CN102280000B (en) * | 2011-06-14 | 2013-02-13 | 常州第二电子仪器有限公司 | Laser alarm |
| CN102664676A (en) * | 2012-04-18 | 2012-09-12 | 中国科学院西安光学精密机械研究所 | Transmission and test system for signal-wavelength 3Gbps space high-speed light |
| CN102664676B (en) * | 2012-04-18 | 2015-05-13 | 中国科学院西安光学精密机械研究所 | Transmission and test system for signal-wavelength 3Gbps space high-speed light |
| CN108318890A (en) * | 2018-01-04 | 2018-07-24 | 西安理工大学 | A kind of aerosol detection radar system for making light source using white light LEDs |
| CN109600164A (en) * | 2018-12-26 | 2019-04-09 | 华中光电技术研究所（中国船舶重工集团有限公司第七七研究所） | For the quick guidance capturing method and system between moving platform free space optical communication machine |
| CN109600164B (en) * | 2018-12-26 | 2021-11-26 | 华中光电技术研究所（中国船舶重工集团有限公司第七一七研究所） | Method and system for fast guiding and capturing between free space optical communication machines |
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