CN115941038A - Carrier-borne wireless optical communication system - Google Patents
Carrier-borne wireless optical communication system Download PDFInfo
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- CN115941038A CN115941038A CN202211576886.5A CN202211576886A CN115941038A CN 115941038 A CN115941038 A CN 115941038A CN 202211576886 A CN202211576886 A CN 202211576886A CN 115941038 A CN115941038 A CN 115941038A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a ship-based wireless optical communication system which is characterized by being provided with a communication processing unit, an optical antenna unit and an aiming acquisition tracking PAT unit which are sequentially connected. The system adopts an infrared polarization imaging photoelectric detection and identification mode to determine the position of the offshore target, can overcome the interference of electromagnetic waves and the interference of a complex optical environment on the sea surface, and has the advantages of strong interference resistance and confidentiality and large communication capacity.
Description
Technical Field
The invention belongs to the field of wireless optical communication, relates to high-capacity wireless laser communication between ships, and particularly relates to a carrier-borne wireless optical communication system.
Background
Electromagnetic waves are commonly used as information carriers for communication between traditional ships, and the mode has the defects of easy interference, easy interception, low speed and the like. The wireless optical communication has the advantages of electromagnetic interference resistance, difficult interception, high communication rate and the like, and can provide high-bandwidth and high-reliability communication guarantee by applying the wireless optical communication to ship communication. The wireless optical communication between ships firstly needs to locate the position of an opposite end, then can search for a capture target, and simultaneously needs to isolate shaking and vibration in a ship movement drifting state to automatically and accurately align laser beams so as to realize the aim of wireless laser communication; because the initial position of the ship is unknown and the position of the ship is constantly changed, the traditional positioning opposite-end position mode adopts a radar detection target to guide photoelectric tracking equipment or adopts a global positioning system + an inertial navigation system (GPS/INS), and the two modes have the defects that electromagnetic waves are easily interfered and intercepted.
Disclosure of Invention
The invention aims to provide a carrier-based wireless optical communication system aiming at the defects of the prior art. The system adopts an infrared polarization imaging photoelectric detection and identification mode to determine the position of the offshore target, can overcome the interference of electromagnetic waves and the interference of a complex optical environment on the sea surface, and has the advantages of strong interference resistance and confidentiality and large communication capacity.
The technical scheme for realizing the purpose of the invention is as follows:
a ship-borne wireless optical communication system is provided with a communication processing unit, an optical antenna unit and an aiming acquisition tracking PAT unit which are sequentially connected, wherein:
the communication processing unit is provided with a photoelectric conversion circuit and an electro-optical conversion circuit: the photoelectric conversion circuit comprises an interface conversion circuit, a signal processing circuit, a signal amplifying circuit and a photoelectric detector which are connected in sequence; the communication processing unit completes the functions of user service signal interface conversion, signal error correction coding and decoding, laser modulation and driving, optical signal amplification and signal detection receiving, and realizes the conversion from user data to space transmission laser signals and the conversion from space transmission laser signals to user data;
the optical antenna unit is provided with a beacon light emission light path, a beacon light receiving light path and a signal light transceiving light path, wherein the beacon light emission light path is provided with a beacon light emission primary mirror, a beacon light emission unit, a beacon light laser and a laser driving unit which are sequentially arranged at intervals; the beacon light receiving light path is provided with a beacon light receiving primary mirror, a beacon light receiving secondary mirror, a first diaphragm, a first spectroscope, a first focusing mirror, a first collimating mirror, a second focusing mirror and a third focusing mirror, wherein the beacon light receiving primary mirror, the beacon light receiving secondary mirror, the first diaphragm, the first spectroscope, the first focusing mirror, the first collimating mirror and the second focusing mirror are sequentially arranged at intervals; the signal light receiving and transmitting light path is provided with a signal light receiving and transmitting primary mirror, a signal light receiving and transmitting secondary mirror, a second diaphragm, a fourth focusing mirror, a second collimating mirror, a dichroic mirror, a fifth focusing mirror, a third collimating mirror, a filter lens, a second dichroic mirror and a sixth focusing mirror which are sequentially arranged at intervals, wherein the fourth collimating mirror is arranged on the side surface of the dichroic mirror and connected with the dichroic mirror, the other end of the fourth collimating mirror is connected with a signal transmitting unit, the signal transmitting unit is connected with a light power amplifier in the communication processing unit, the seventh focusing mirror is arranged on the side surface of the second dichroic mirror and connected with the signal receiving unit, and the optical antenna unit finishes beam contraction, beam expansion, color separation, light filtering and light splitting processing of signal receiving and transmitting light beams;
the aiming, capturing and tracking PAT unit is provided with a scanning, capturing and coarse tracking controller, a detection and positioning guide unit connected with the scanning, capturing and coarse tracking controller, a servo stable two-dimensional rotary table, a scanning and capturing CCD, a coarse tracking QD, a vibrating mirror, a fine tracking controller and a fine tracking QD which are sequentially connected, wherein the coarse tracking QD is connected with a third focusing mirror in the optical antenna unit, the scanning and capturing CCD is connected with a second focusing mirror in the optical antenna unit, the vibrating mirror is connected with the optical antenna unit, and the aiming, capturing and tracking PAT unit realizes initial pointing, rapid capturing and accurate automatic tracking of space beams.
The detection positioning guide module is provided with two paths of light paths: one path comprises a panoramic lens, a panoramic infrared polarization imaging unit, a detection CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, the other path comprises a telephoto lens, a telephoto infrared polarization imaging unit, an identification CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, and the two paths of light paths share the image processor and the scanning capturing and coarse tracking control unit to realize the detection, identification and positioning of a target and guide the initial pointing of equipment.
According to the technical scheme, the signal light transceiving light path and the beacon light path are separately designed, the system complexity is reduced, the spatial structure priority layout is carried out on the signal light transceiving light path and the fine tracking light path which have high precision requirements, and the system reliability can be improved.
When a link is established, firstly, target detection is carried out, each end of a ship aims at a capturing tracking PAT unit to obtain opposite end position information through a detecting and positioning guide unit 35, a pointing angle is calculated according to the opposite end position information, a servo stable two-dimensional turntable 33 carries out initial pointing, then a scanning and capturing stage is entered, one end emits beacon light and scans an uncertain region, simultaneously, a CCD camera receives signals in real time, beacon light returned by the opposite end is prepared to be received, the other end is in a staring and receiving state, once the beacon light emitted by a scanning end enters a receiving field of the opposite end CCD camera, the beacon light can be captured, accurate pointing of the beacon light can be carried out according to the detected target position, a coarse tracking closed loop is realized, tracking precision can be ensured after the coarse tracking closed loop, the signal light covers an opposite end optical antenna, the opposite end optical antenna enters a receiving field of a fine tracking detector QD, the detector QD can calculate the accurate position of a target after receiving the signal light, a galvanometer is driven to accurately point the signal light, the fine tracking closed loop is realized, wherein the executing mechanisms of the initial pointing, the scanning and capturing and the coarse tracking are all servo stable two-dimensional turntable, the adjusting angle is large, the adjusting range is 360 DEG, and the ship can be isolated at the low-frequency ship pitching angle and the ship can be greatly separated; the signal light divergence angle is small, the receiving field of view is small, the system requires precise tracking QD to realize high-frequency and high-precision angle resolution, and adopts piezoelectric ceramics with high execution speed and high precision to drive a galvanometer for compensation, so that high-frequency and small-amplitude vibration of a ship during navigation is isolated; thereby ensuring that the signal light can receive sufficient optical power to establish the communication link.
The technical scheme adopts panoramic imaging, enlarges the detection range, and overcomes the defects that the detection mode of electromagnetic waves such as radar or GPS and the like is easy to interfere and damage;
according to the technical scheme, the infrared polarization degree image and infrared intensity radiation image fusion enhancement technology is adopted for target detection and identification, sea surface background noise is suppressed, the contrast ratio and the signal to noise ratio of the target are improved, and the detection capability of the photoelectric detection technology on the weak and small target on the sea surface and the identification capability of target imaging are enhanced;
the technical scheme overcomes the defects of easy interference and easy interception in the traditional electromagnetic wave communication process, improves the reliability and safety of secret communication, and has the advantage of large communication capacity.
The system determines the position of the offshore target by adopting the existing infrared polarization imaging photoelectric detection and identification mode, can overcome electromagnetic wave interference and sea surface complex optical environment interference, and has the advantages of strong interference resistance and confidentiality and large communication capacity.
Drawings
FIG. 1 is a schematic diagram of a system according to an embodiment;
FIG. 2 is a schematic diagram of an embodiment of a probe guidance positioning unit;
FIG. 3 is a schematic diagram illustrating a detection logic of the detection-guided positioning unit according to an embodiment;
FIG. 4 is a schematic diagram of infrared imaging of a weak target in an embodiment;
FIG. 5 is a schematic diagram of fused imaging of infrared polarization and intensity of a weak target in an embodiment;
FIG. 6 is a schematic diagram of the positioning of the weak target in the original panorama in the embodiment;
FIG. 7 is a schematic diagram of the positioning of a weak target in a fusion map in the embodiment;
FIG. 8 is a schematic view of a recognition image of a sailboat of an object in the embodiment;
fig. 9 is a schematic view of a cargo ship identification image of an object in the embodiment.
In the figure, 1, a beacon light emission primary mirror 2, a beacon light emission unit 3, a beacon light laser 4, a laser driving unit 5, a fourth collimating mirror 6, a signal emission unit 7, a signal receiving unit 8, a seventh focusing mirror 9, a dichroic mirror 10, a focusing mirror 11, a collimating mirror 12, a filter 13, a beam splitter 14, a focusing mirror 15, a fine tracking QD 16, a signal light transceiving primary mirror 17, a signal light transceiving secondary mirror 18, a diaphragm 19, a focusing mirror 20, a collimating mirror 21, a vibrating mirror 22, a fine tracking controller 23, a beacon light receiving primary mirror 24, a beacon light receiving secondary mirror 25, a diaphragm 26, a beam splitter 27, a focusing mirror 28, a collimating mirror 29, a focusing mirror 30, a scanning capturing CCD 31, a focusing mirror 32, a coarse tracking CCD 33, a servo stable two-dimensional turntable 34, a scanning capturing and coarse tracking control unit 35, a detection positioning guiding unit 36, an interface conversion circuit 37, a signal processing circuit 38, a signal amplification circuit 39, a photoelectric detector 40, a modulation driving circuit 41 and a signal laser 42 light power amplifier.
Detailed Description
The invention will be further described with reference to the following drawings and examples, but the invention is not limited thereto.
The embodiment is as follows:
in the example, the interface conversion circuit adopts a standard gigabit Ethernet port, the beacon laser adopts a laser with 850nm wavelength, the signal laser adopts a laser with 1550nm wavelength, the optical power amplifier adopts a c-band erbium-doped fiber amplifier (EDFA) module, the signal amplification circuit adopts an ADA4807-2ARMZ operational amplifier, the photoelectric detector adopts an LSIPD-UL0.3 InGaAs photoelectric detector, the coarse tracking detector adopts a QP5-6-501040 four-quadrant detector, the fine tracking detector adopts an IGA-030-QD four-quadrant detector, and the scanning capture CCD, the detection CCD and the identification CCD all adopt a CMV4000 large area array CMOS detector with resolution of 2048 multiplied by 2048; the panoramic lens adopts a 360-degree all-round lens, and the telephoto lens adopts a 50-750 mm variable focus lens.
Referring to fig. 1, a ship-based wireless optical communication system is provided with a communication processing unit, an optical antenna unit and an aiming acquisition tracking PAT unit, which are connected in sequence, wherein:
the communication processing unit is provided with a photoelectric conversion circuit and an electro-optical conversion circuit; the photoelectric conversion circuit comprises an interface conversion circuit 36, a signal processing circuit 37, a signal amplifying circuit 38 and a photoelectric detector 39 which are connected in sequence; the electro-optical conversion circuit comprises an interface conversion circuit 36, a signal processing circuit 37, a modulation driving circuit 40, a signal laser 41 and an optical power amplifier 42 which are sequentially connected, the electro-optical conversion circuit and the electro-optical conversion circuit share the interface conversion circuit 36 and the signal processing circuit 37, and a communication processing unit completes the functions of user service signal interface conversion, signal error correction coding and decoding, laser modulation and driving, optical signal amplification and signal detection receiving, and realizes the conversion from user data to space transmission laser signals and the conversion from space transmission laser signals to user data;
the optical antenna unit is provided with a beacon light emission light path, a beacon light receiving light path and a signal light transceiving light path, wherein the beacon light emission light path is provided with a beacon light emission main mirror 1, a beacon light emission unit 2, a beacon light laser 3 and a laser driving unit 4 which are sequentially arranged at intervals; the beacon light receiving light path is provided with a beacon light receiving primary mirror 23, a beacon light receiving secondary mirror 24, a first diaphragm 25, a first spectroscope 26, a first focusing mirror 27, a first collimating mirror 28 and a second focusing mirror 29 which are sequentially arranged at intervals, and further comprises a third focusing mirror 31 arranged at a position beside the measuring surface of the first spectroscope 26, and the beacon light receiving light path realizes the receiving and light splitting of the beacon light; the signal light transceiving optical path is provided with a signal light transceiving primary mirror 16, a signal light transceiving secondary mirror 17, a second diaphragm 18, a fourth focusing mirror 19, a second collimating mirror 20, a dichroic mirror 9, a fifth focusing mirror 10, a third collimating mirror 11, a filter 12, a second dichroic mirror 13 and a sixth focusing mirror 14 which are sequentially arranged at intervals, wherein the fourth collimating mirror 5 is arranged on the side surface of the dichroic mirror 9 and connected with the dichroic mirror 9, the other end of the fourth collimating mirror is connected with a signal transmitting unit 6, the signal transmitting unit 6 is connected with a light power amplifier 42 in a communication processing unit, the seventh focusing mirror 8 is arranged on the side surface of the second dichroic mirror 13 and connected, the other end of the seventh collimating mirror is connected with a signal receiving unit 7, and the optical antenna unit finishes beam shrinking, beam expanding, color separation, filtering and light splitting processing of the signal transceiving light beams;
the aiming capturing tracking PAT unit is provided with a capturing and coarse tracking controller 34, a detection positioning guide unit 35 connected with the capturing and coarse tracking controller 34, a servo stable two-dimensional rotary table 33, a scanning capturing CCD 30, a coarse tracking QD 32, a galvanometer 21, a fine tracking controller 22 and a fine tracking QD15 which are connected in sequence, wherein the coarse tracking QD 32 is connected with a third focusing lens 31 in the optical antenna unit, the scanning capturing CCD 30 is connected with a second focusing lens 29 in the optical antenna unit, the galvanometer 21 is connected with the optical antenna unit, and the aiming capturing tracking PAT unit realizes initial pointing, rapid capturing and accurate automatic tracking of space beams.
The schematic diagram of the detection positioning guidance module 35 is shown in fig. 2, and two light paths are provided: one path comprises a panoramic lens, a panoramic infrared polarization imaging unit, a detection CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, the other path comprises a telephoto lens, a telephoto infrared polarization imaging unit, an identification CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, and the two paths of light paths share the image processor and the scanning capturing and coarse tracking control unit to realize the detection, identification and positioning of a target and guide the initial pointing of equipment.
In the present embodiment, when weak target detection is performed, a large-field CCD detection is adopted, as shown in fig. 3, an infrared panoramic infrared polarization image is first acquired through a panoramic lens 43 and an infrared polarization imaging unit 44, as shown in fig. 5, fig. 5 shows that the contrast of the target in the processed infrared polarization image is much higher than that in the original infrared image in fig. 4, then target detection is performed on the acquired image, as shown in fig. 6 and 7, after the target is detected, a long-focus lens 48 is used to acquire a target infrared polarization image, the target is identified in a processor through a pre-trained data sample, as shown in fig. 8 and 9, the type of the target is identified, after the target is confirmed, the target uncertain region can be limited to the mrad level, so that beacon light at the opposite end is captured quickly, scanning capture time is reduced, and capture probability is improved, the obtained target direction is used as a positioning guide signal to be transmitted to a scanning capturing and rough tracking control unit 47, a servo turntable 33 is controlled to carry out initial pointing, then the scanning capturing stage is started, one end of the servo turntable is used for emitting beacon light and scanning an uncertain area, meanwhile, a CCD camera 45 is detected in real time to receive signals and prepare to receive the beacon light returned by the opposite end, the other end of the servo turntable is in a staring receiving state, once the beacon light emitted by a scanning end enters a receiving field of the opposite end detection CCD camera 45 in a scanning mode, the beacon light can be captured, the accurate pointing of the beacon light can be carried out according to the detected target position, a rough tracking closed loop is realized, the tracking precision of the rough tracking closed loop can ensure that the signal light covers an opposite end optical antenna and enters a receiving field of a fine tracking detector QD15, the fine tracking detector QD15 can calculate the accurate position of the target after receiving the signal light, and a galvanometer is driven to carry out accurate pointing to the signal light, realizing a fine tracking closed loop; the executing mechanisms of initial pointing, scanning capturing and rough tracking are all servo stable two-dimensional turntables 33, the two-dimensional turntables 33 are large in adjusting angle, the azimuth angle adjusting range is 360 degrees, the pitch angle adjusting range is 120 degrees, and low-frequency and large-amplitude shaking of the ship during navigation can be isolated; the signal light divergence angle is small, the receiving field of view is small, the system requires precise tracking QD to realize high-frequency and high-precision angle resolution, and adopts piezoelectric ceramics with high execution speed and high precision to drive a galvanometer for compensation, so that high-frequency and small-amplitude vibration of a ship during navigation is isolated; thereby ensuring that the signal light can receive enough optical power to establish the communication link.
Claims (2)
1. A ship-borne wireless optical communication system is characterized in that the ship-borne wireless optical communication system is provided with a communication processing unit, an optical antenna unit and an aiming acquisition tracking PAT unit which are sequentially connected, wherein:
the communication processing unit is provided with a photoelectric conversion circuit and an electro-optical conversion circuit: the photoelectric conversion circuit comprises an interface conversion circuit, a signal processing circuit, a signal amplifying circuit and a photoelectric detector which are sequentially connected; the electro-optical conversion circuit comprises an interface conversion circuit, a signal processing circuit, a modulation driving circuit, a signal laser and an optical power amplifier which are sequentially connected, and the electro-optical conversion circuit share the interface conversion circuit and the signal processing circuit;
the optical antenna unit is provided with a beacon light emission light path, a beacon light receiving light path and a signal light transceiving light path, wherein the beacon light emission light path is provided with a beacon light emission main mirror, a beacon light emission unit, a beacon light laser and a laser driving unit which are sequentially arranged at intervals, the beacon light is emitted at a large divergence angle, and one path of independent emission light path is adopted; the beacon light receiving optical path is provided with a beacon light receiving primary mirror, a beacon light receiving secondary mirror, a first diaphragm, a first spectroscope, a first focusing mirror, a first collimating mirror, a second focusing mirror and a third focusing mirror, wherein the beacon light receiving primary mirror, the beacon light receiving secondary mirror, the first diaphragm, the first spectroscope, the first focusing mirror, the second collimating mirror and the third focusing mirror are sequentially arranged at intervals; the signal light receiving and transmitting light path is provided with a signal light receiving and transmitting primary mirror, a signal light receiving and transmitting secondary mirror, a second diaphragm, a fourth focusing mirror, a second collimating mirror, a dichroic mirror, a fifth focusing mirror, a third collimating mirror, a filter lens, a second dichroic mirror and a sixth focusing mirror which are sequentially arranged at intervals, wherein the fourth collimating mirror is arranged on the side surface of the dichroic mirror and connected with the dichroic mirror, the other end of the fourth collimating mirror is connected with a signal transmitting unit, the signal transmitting unit is connected with a light power amplifier in the communication processing unit, a seventh focusing mirror is arranged on the side surface of the second dichroic mirror and connected with the signal receiving unit, and the optical antenna unit finishes the beam contraction, beam expansion, color separation, light filtering and light splitting processing of a signal receiving and transmitting light beam;
the aiming capturing tracking PAT unit is provided with a scanning capturing and coarse tracking controller, a detection positioning guide unit connected with the scanning capturing and coarse tracking controller, a servo stable two-dimensional rotary table, a scanning capturing CCD, a coarse tracking QD, a vibrating mirror, a fine tracking controller and a fine tracking QD which are sequentially connected, wherein the coarse tracking QD is connected with a third focusing mirror in the optical antenna unit, the scanning capturing CCD is connected with a second focusing mirror in the optical antenna unit, the vibrating mirror is connected with the optical antenna unit, and the aiming capturing tracking PAT unit realizes initial pointing, rapid capturing and accurate automatic tracking of space light beams.
2. The shipboard wireless optical communication system of claim 1, wherein the detection positioning guidance module is provided with two optical paths: one path comprises a panoramic lens, a panoramic infrared polarization imaging unit, a detection CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, the other path comprises a telephoto lens, a telephoto infrared polarization imaging unit, an identification CCD, an image processor and a scanning capturing and coarse tracking control unit which are sequentially connected, and the two paths of light paths share the image processor and the scanning capturing and coarse tracking control unit to realize the detection, identification and positioning of a target and guide the initial pointing of equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211576886.5A CN115941038A (en) | 2022-12-09 | 2022-12-09 | Carrier-borne wireless optical communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211576886.5A CN115941038A (en) | 2022-12-09 | 2022-12-09 | Carrier-borne wireless optical communication system |
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| CN115941038A true CN115941038A (en) | 2023-04-07 |
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| CN202211576886.5A Pending CN115941038A (en) | 2022-12-09 | 2022-12-09 | Carrier-borne wireless optical communication system |
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