CN100534009C - Testing device for influence of atmospheric turbulence to spacing laser communication - Google Patents
Testing device for influence of atmospheric turbulence to spacing laser communication Download PDFInfo
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- CN100534009C CN100534009C CNB2008100505759A CN200810050575A CN100534009C CN 100534009 C CN100534009 C CN 100534009C CN B2008100505759 A CNB2008100505759 A CN B2008100505759A CN 200810050575 A CN200810050575 A CN 200810050575A CN 100534009 C CN100534009 C CN 100534009C
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Abstract
A device for detecting the effects of an atmospheric turbulence to space laser communication provided by the invention consists of an emitting terminal and a receiving terminal; the emitting terminal consists of a laser expanding lens (1), a laser expanding lens (2), a laser expanding lens (3), a fixing mechanism (4), a semiconductor laser array (5), a pitch rotating floor (6) and a course rotating floor (7); the receiving terminal consists of an adjustable diaphragm (8), a card type system (9), a lens (10), a lens (11), a photodetector (12), a computer (13), a lens (14), a CCD camera (16), a pitch rotating floor (17), a course rotating floor (18) and a dispersion prism(19). The detecting device can realize the detecting of the effects of the atmospheric turbulence to space laser communication, can measure an atmospheric refraction index constant, can validate different receiving calibers and different CCD integral times as well as an atmospheric twinkling variance during multi-caliber emitting and can give the time domain and space domain distribution situations of light intensity.
Description
Technical field
The present invention relates to atmospheric turbulance influences testing apparatus to laser space communication system, belongs to the laser space communication technical field.
Technical background
Laser communication system with laser as information carrier, the height coherence and the spatial orientation of laser have determined laser space communication and RF to communicate by letter to compare with the obvious advantage in many aspects: antijamming capability is strong, fail safe good, equipment volume is little, in light weight, frequency spectrum is not subjected to control, low in energy consumption, system's mobility strong, cost are low, clear transport protocol etc.But since the influence of atmospheric turbulance when laser when turbulent atmosphere transmits, make light wave coherence's degeneration, phase fluctuation, reach factors such as angle fluctuating, light intensity fluctuation, all will exert an influence to tracking accuracy, traffic rate and bandwidth, the error rate etc. of beam-capturing, aligning and the tracking subsystem of laser communication system.In fact atmosphere also comprises the absorption of atmospheric molecule to the influence of laser communication system, factor affecting such as scattering, influence has had the explicit mathematical model to describe and analyzed for the ABSORPTION AND SCATTERING equimolecular, but the influence for atmospheric turbulance also is not very perfect owing to people describe the Mathematical Modeling of atmospheric turbulance, so turbulent flow is not set up complete Mathematical Modeling to the current position that has influence on of laser communication system yet, its analytical method is all carried out by experiment, and its experimental system all is some characteristic parameter (Ma Xiaoshan of single checking atmosphere, red legend more, Rao Ruizhong, measure the large-caliber laser isotope and the method for air index structural constant, number of patent application: 200710024298.X).The experimental provision system that this just need set up one makes it verify turbulent flow out to the influence of laser communication system, can measure the characteristic parameter of turbulent flow simultaneously, and the transmission in turbulent atmosphere provides the guidance of theory and practice to laser.
Summary of the invention
In order to verify influence and the concrete corrective measure thereof of turbulent atmosphere to laser communication.The object of the present invention is to provide atmospheric turbulance that laser space communication is influenced testing apparatus.
Atmospheric turbulance provided by the invention influences being constructed as follows of testing apparatus to laser space communication:
The bright device of we is made of launch terminal and two parts of receiving terminal, as depicted in figs. 1 and 2.
As shown in Figure 1, described launch terminal is by first beam expanding lens, 1, the second beam expanding lens, 2, the three beam expanding lenss 3, fixed mechanism 4, and semiconductor laser array 5, the first pitching turntables 6, the first course turntables 7 constitute;
Described first beam expanding lens, 1, the second beam expanding lens, 2, the three beam expanding lenss 3 are fixed on the fixed mechanism 4, and the relative position between them can be adjusted; First beam expanding lens 1, second beam expanding lens 2, the 3rd beam expanding lens 3 is associated in semiconductor laser array 5 respectively by optical fiber, and fixed mechanism 4 is fixed on the first pitching turntable 6 with semiconductor laser array 5, and the first pitching turntable 6 is fixed on the first course turntable 7;
As shown in Figure 2, described receiving terminal is by adjustable diaphragm 8, cassette system 9, the first lens, 10, the second lens 11, photodetector 12, computer 13, the three lens 14, CCD camera 15, base plate 16, the second pitching turntables 17, the second course turntables 18, Amici prism 19 constitutes;
Described adjustable diaphragm 8 is placed in cassette system 9 front ends; Cassette system 9, the first lens, 10, the second lens 11, photodetector 12, computer 13, the three lens 14, CCD camera 15, Amici prism 19 all is installed on the base plate 16, and base plate 16 is fixed on the second pitching turntable 17, and the second pitching turntable 17 is fixed on the second course turntable 18; First lens 10 are placed in the focus place of cassette system 9, photodetector 12 is placed in the focus place of second lens 11, CCD camera 15 is placed in the focus place of the 3rd lens 14, Amici prism 19 is divided into two bundles with the collimated light beam of first lens 10, a branch of light is given second lens 11, and a branch of light is given the 3rd lens 14; Photodetector 12 links to each other with computer 13 by data wire, and CCD camera 15 links to each other with computer 13 by data wire.
Atmospheric turbulance provided by the invention is as follows to the measuring process that laser space communication influences testing apparatus.
The air index constant C
n 2Measurement:
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through first beam expanding lens, 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, second lens 11, received by photodetector 12 and CCD camera 15 respectively behind the 3rd lens 14, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
For the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, use following formula and can ask for C
n 2, this value is the time domain variance:
K=2 π/λ in the formula, λ are semiconductor laser array 5 emission laser wave long values, and L is the distance between launch terminal and receiving terminal, can search by the GPS measurement or by map to get final product.
K=2 π/λ in the formula, λ are semiconductor laser array 5 emission laser wave long values, and L is the distance between launch terminal and receiving terminal, can search by the GPS measurement or by map to get final product.
The aperture smoothly influences laser communication:
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through first beam expanding lens, 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, second lens 11, received by photodetector 12 and CCD camera 15 respectively behind the 3rd lens 14, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Be the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, CCD camera 15 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Be the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, repeat said process adjustable diaphragm 8 and be modulated to 10cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 8cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 6cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 4cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 2cm, calculate the flicker variance; Compare according to the flicker variance that calculates under the different bores, along with reducing of bore, statistics flicker variance increases gradually, the turbulent flow saturated phenomenon communication error rate finally occurs and all improves greatly, even communication failure, can verify of the influence of aperture smoothing effect to laser communication.
CCD influences laser communication the time of integration:
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through expanding bundle first beam expanding lens 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the three lens 14 backs are received by CCD camera 15, CCD camera 15 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Be the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, repeat the time of integration that said process changes the CCD camera, obtain the flicker variance of different CCD under the time of integration; The flicker variance that calculates the time of integration according to different CCD compares, along with the CCD increase of the time of integration, statistics flicker variance reduces gradually, the light intensity of the image of semiconductor laser array 5 emission laser tends towards stability, obtain easily higher tracking accuracy, verify influence different CCD time of integration laser communication system.
Multiple aperture is launched the influence to laser communication:
Semiconductor laser array 5 emission laser, through first beam expanding lens 1, second beam expanding lens, 2, the three beam expanding lenss, 3 back laser enter turbulent atmosphere, and adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the second lens 11 backs are by photodetector 12, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Normalization light intensity fluctuation variance for weak turbulent-flow conditions lower plane ripple.
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through beam expanding lens 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the second lens 11 backs are by photodetector 12, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Normalization light intensity fluctuation variance for weak turbulent-flow conditions lower plane ripple.
The light intensity flicker statistical variance of using single laser to obtain is compared with the light intensity flicker statistical variance of using three lasers to obtain, the light intensity of using three lasers to obtain is glimmered statistical variance less than the light intensity flicker statistical variance that single laser obtains, and can verify the influence of multiple aperture emission to laser communication.
Beneficial effect of the present invention: atmospheric turbulance influences testing apparatus to laser space communication, can measure the air index constant and simultaneously can verify different reception bores, different CCD time of integration, the flicker variance of atmosphere during many bores emissions.Use photodetector and the combined measurement air index of ccd detector spare constant, can provide the time domain and the spatial domain distribution situation of light intensity, effectively raise the air index measurement accuracy, theory analysis and the experimental verification transmitted in atmosphere for laser lay the first stone.
Description of drawings
Fig. 1 and Fig. 2 are that atmospheric turbulance influences testing apparatus structural representation block diagram to laser space communication.Wherein, Fig. 1 launch terminal mechanism forms schematic block diagram; Fig. 2 receiving terminal mechanism forms schematic block diagram.
Embodiment
Embodiment 1
The cassette system that embodiment 1 uses: the reception bore is 20mm～250mm (adjustable), photodetector is selected pin photoelectric diode BPW34B for use, CCD selects TCB230 for use, and it is the high power laser of 532nm that laser is selected wavelength for use, and the Amici prism splitting ratio is 1:1 and depolarization.
The bright device of we is made of launch terminal and two parts of receiving terminal, as depicted in figs. 1 and 2.
As shown in Figure 1, described launch terminal is by first beam expanding lens, 1, the second beam expanding lens, 2, the three beam expanding lenss 3, fixed mechanism 4, and semiconductor laser array 5, the first pitching turntables 6, the first course turntables 7 constitute;
Described first beam expanding lens, 1, the second beam expanding lens, 2, the three beam expanding lenss 3 are fixed on the fixed mechanism 4, and the relative position between them can be adjusted; First beam expanding lens 1, second beam expanding lens 2, the 3rd beam expanding lens 3 is associated in semiconductor laser array 5 respectively by optical fiber, and fixed mechanism 4 is fixed on the first pitching turntable 6 with semiconductor laser array 5, and the first pitching turntable 6 is fixed on the first course turntable 7;
As shown in Figure 2, described receiving terminal is by adjustable diaphragm 8, cassette system 9, the first lens, 10, the second lens 11, photodetector 12, computer 13, the three lens 14, CCD camera 15, base plate 16, the second pitching turntables 17, the second course turntables 18, Amici prism 19 constitutes;
Described adjustable diaphragm 8 is placed in cassette system 9 front ends; Cassette system 9, the first lens, 10, the second lens 11, photodetector 12, computer 13, the three lens 14, CCD camera 15, Amici prism 19 all is installed on the base plate 16, and base plate 16 is fixed on the second pitching turntable 17, and the second pitching turntable 17 is fixed on the course turntable 18; First lens 10 are placed in the focus place of cassette system 9, photodetector 12 is placed in the focus place of second lens 11, CCD camera 15 is placed in the focus place of the 3rd lens 14, Amici prism 19 is divided into two bundles with the collimated light beam of first lens 10, a branch of light is given second lens 11, and a branch of light is given the 3rd lens 14; Photodetector 12 links to each other with computer 13 by data wire, and CCD camera 15 links to each other with computer 13 by data wire.
Atmospheric turbulance provided by the invention is as follows to the measuring process that laser space communication influences testing apparatus.
The air index constant C
n 2Measurement:
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through first beam expanding lens, 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, second lens 11, received by photodetector 12 and CCD camera 15 respectively behind the 3rd lens 14, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
For the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, use following formula and can ask for C
n 2, this value is the time domain variance:
K=2 π/λ in the formula, λ are semiconductor laser array 5 emission laser wave long values, and L is the distance between launch terminal and receiving terminal, can search by the GPS measurement or by map to get final product.
K=2 π/λ in the formula, λ are semiconductor laser array 5 emission laser wave long values, and L is the distance between launch terminal and receiving terminal, can search by the GPS measurement or by map to get final product.
The aperture smoothly influences laser communication:
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through first beam expanding lens, 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, second lens 11, received by photodetector 12 and CCD camera 15 respectively behind the 3rd lens 14, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Be the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, CCD camera 15 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Be the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, repeat said process adjustable diaphragm 8 and be modulated to 10cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 8cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 6cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 4cm, calculate the flicker variance; Repeat said process adjustable diaphragm 8 and be modulated to 2cm, calculate the flicker variance; Compare according to the flicker variance that calculates under the different bores, along with reducing of bore, statistics flicker variance increases gradually, the turbulent flow saturated phenomenon communication error rate finally occurs and all improves greatly, even communication failure, can verify of the influence of aperture smoothing effect to laser communication.
CCD influences laser communication the time of integration:
Semiconductor laser array 5 emission laser, expand bundle beam expanding lens 1 back laser through first and enter turbulent atmosphere, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the three lens 14 backs are received by CCD camera 15, CCD camera 15 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance β I2.β I2 is the normalization light intensity fluctuation variance of weak turbulent-flow conditions lower plane ripple, repeats the time of integration that said process changes the CCD camera, obtains the flicker variance of different CCD under the time of integration; The flicker variance that calculates the time of integration according to different CCD compares, along with the CCD increase of the time of integration, statistics flicker variance reduces gradually, the light intensity of the image of semiconductor laser array 5 emission laser tends towards stability, obtain easily higher tracking accuracy, verify influence different CCD time of integration laser communication system.
Multiple aperture is launched the influence to laser communication:
Semiconductor laser array 5 emission laser, through first beam expanding lens 1, second beam expanding lens, 2, the three beam expanding lenss, 3 back laser enter turbulent atmosphere, and adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the second lens 11 backs are by photodetector 12, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Normalization light intensity fluctuation variance for weak turbulent-flow conditions lower plane ripple.
Semiconductor laser array 5 emission laser, enter turbulent atmosphere through first beam expanding lens, 1 back laser, adjustable diaphragm 8 modulation apertures are 20cm to the maximum, light beam enters cassette system 9, by first lens 10, Amici prism 19, the second lens 11 backs are by photodetector 12, photodetector 12 is converted to the signal of telecommunication to the light signals that receive, and this signal of telecommunication is sent in the computer row statistical disposition ask its variance
Normalization light intensity fluctuation variance for weak turbulent-flow conditions lower plane ripple.
The light intensity flicker statistical variance of using single laser to obtain is compared with the light intensity flicker statistical variance of using three lasers to obtain, the light intensity of using three lasers to obtain is glimmered statistical variance less than the light intensity flicker statistical variance that single laser obtains, and can verify the influence of multiple aperture emission to laser communication.
Atmospheric turbulance influences testing apparatus to laser space communication, can measure the air index constant and simultaneously can verify different reception bores, different CCD time of integration, the flicker variance of atmosphere during many bores emissions.Use photodetector and the combined measurement air index of ccd detector spare constant, can provide the time domain and the spatial domain distribution situation of light intensity, effectively raise the air index measurement accuracy, theory analysis and the experimental verification transmitted in atmosphere for laser lay the first stone.
Claims (1)
1, a kind of atmospheric turbulance influences testing apparatus to laser space communication, it is characterized in that: it is made of launch terminal and two parts of receiving terminal; Described launch terminal is by first beam expanding lens (1), and second beam expanding lens (2), the 3rd beam expanding lens (3), fixed mechanism (4), semiconductor laser array (5), the first pitching turntable (6) and the first course turntable (7) constitute; Described first beam expanding lens (1), second beam expanding lens (2), the 3rd beam expanding lens (3) are fixed on the fixed mechanism (4), and the relative position between them can be adjusted; First beam expanding lens (1), second beam expanding lens (2), the 3rd beam expanding lens (3) are associated in semiconductor laser array (5) by optical fiber, fixed mechanism (4) is fixed on the first pitching turntable (6) with semiconductor laser array (5), and the first pitching turntable (6) is fixed on the first course turntable (7);
Described receiving terminal is made of adjustable diaphragm (8), cassette system (9), first lens (10), second lens (11), photodetector (12), computer (13), the 3rd lens (14), CCD camera (15), base plate (16), the second pitching turntable (17), the 3rd course turntable (18) and Amici prism (19); Described adjustable diaphragm (8) is placed in cassette system (9) front end, cassette system (9), first lens (10), second lens (11), photodetector (12), computer (13), the 3rd lens (14), CCD camera (15) and Amici prism (19) all are installed on the base plate (16), base plate (16) is fixed on the second pitching turntable (17), and the second pitching turntable (17) is fixed on the second course turntable (18); First lens (10) are placed in the focus place of cassette system (9), photodetector (12) is placed in the focus place of second lens (11), CCD camera (15) is placed in the focus place of the 3rd lens (14), Amici prism is divided into two bundles with the collimated light beam of first lens (10), a branch of light is given second lens (11), a branch of light is given the 3rd lens (14), and photodetector (12) links to each other with computer (13) by data wire, and CCD camera (15) links to each other with computer (13) by data wire.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101876586A (en) * | 2010-04-09 | 2010-11-03 | 中国科学院上海技术物理研究所 | System and method for testing influence of plume field of engine in air to laser transmission |
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| CN101814952B (en) * | 2010-02-26 | 2012-09-12 | 电子科技大学 | Method for testing lightwave transmission characteristics in atmospheric channel |
| CN101886972B (en) * | 2010-04-09 | 2011-09-14 | 中国科学院上海技术物理研究所 | System and method for testing influence of vacuum plume on infrared laser characteristics |
| CN101980056B (en) * | 2010-11-06 | 2012-10-03 | 四川大学 | Method and device for determining atmospheric turbulence parameter based on M<2> factor and light scintillation index |
| CN102404049A (en) * | 2011-12-23 | 2012-04-04 | 中国人民解放军理工大学 | Wireless optical communication system based on cloud scattering |
| CN102739314B (en) * | 2012-07-06 | 2015-07-15 | 长春理工大学 | Test system and method for scintillation characteristic of fake partially coherent light transmitted in atmosphere turbulence |
| CN102938672B (en) * | 2012-11-16 | 2015-02-25 | 长春理工大学 | Laboratory simulation method of atmospheric influence on wireless laser communication |
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| CN107976632B (en) * | 2017-11-02 | 2020-06-12 | 武汉光谷航天三江激光产业技术研究院有限公司 | Photoelectric conversion efficiency testing device and method |
| CN113839714B (en) * | 2021-10-13 | 2023-03-31 | 天津弘毅光技术有限公司 | Space laser communication terminal integrating communication light receiving and transmitting |
| CN117787021B (en) * | 2024-02-28 | 2024-05-07 | 中国人民解放军海军工程大学 | Laser far field energy density estimation method |
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