CN101645741A - Method for self-calibrating visual axis field of quantum communication system tracking camera - Google Patents
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Abstract
The invention discloses a method for self-calibrating visual axis field of a satellite-to-ground quantum communication system tracking camera, by which a device can calibrate a quantum transceiver module visual axis center, a refine tracking detection visual field center and a crude tracking detection visual field center of an acquisition, tracking and pointing system optical path after the deviceis transmitted to a space orbit or when the device works in a space orbit. The method comprises the following steps: measuring and calculating the parallel misalignment between the quantum transceiver module optical axis of the quantum communication system and the visual axis of the acquisition, tracking and pointing camera by using the acquisition, tracking and pointing camera of the quantum communication acquisition, tracking and pointing system; and automatically regulating and relocating the central position of the visual axis to be consistent with the optical axis of the quantum transceiver module according to the measurement and calculation results by the acquisition, tracking and pointing camera, thereby achieving the purpose of self-calibrating the visual axis field of the satellite-to-ground quantum communication acquisition, tracking and pointing system.
Description
Technical field
The invention belongs to the quantum communications technical field, specifically be meant a kind of quantum communication acquisition with the acquisition and tracking camera optical axis of taking aim at system in the working site automatic Calibration Method.
Background technology
Acquisition and tracking aiming (ATP) systems technology of space or satellite-ground quantum communication technology and quantum communications is one of focus of current international new industrial research.Usually the angle of divergence very little (about 20 μ rad) of the quantum communications laser of quantum communication system employing has proposed very high requirement (generally being less than 20 μ rad) to catching with taking aim at system of quantum communications.Thereby, quantum communication acquisition with optical correction's precision of taking aim at system must be very high (generally need less than 1 μ rad).
Center, visual field and quantum transceiver module optical axis center that catching with the system that takes aim at after machine product is installed the light school of quantum communication system, the essence of system follow the tracks of the center, visual field of camera, slightly follow the tracks of camera can reach the high accuracy unanimity.But in equipment transportation, rocket launching lift-off, temperature conditions change, gravity condition change or other process, multiple factors such as the vibration of equipment and heating power can cause the slight change of system light path.This variation causes the collimation between aforementioned three optical centres to worsen, and gives to catch with taking aim at system and introduces extra error with taking aim at precision.Follow the tracks of viewing field of camera center and error between the quantum transmitting-receiving optical axis and reach several microradians even when higher, catch the requirement that the precision of following the system that takes aim at will be difficult to satisfy satellite-ground quantum communication when this error is especially smart.
Present existing quantum communication acquisition only carries out manual calibration with the system that takes aim at is general when whole machine installation, perhaps the optical parallel degree of system occurs carrying out manual calibration again behind the gross error, and takes way that equipment can be calibrated automatically in the working site.
Summary of the invention
The objective of the invention is to catch with taking aim at system at space or satellite-ground quantum communication, provide a kind of effective method to make equipment in working order down even be transmitted into behind the space track when rail work, system can be automatically to catching with the quantum transceiver module central visual axis of taking aim at system light path, smart tracking viewing field of camera center and slightly following the tracks of the detection viewing field center and calibrate.This method is equally applicable to the ground quantum communication acquisition with the on-the-spot calibration automatically of taking aim at system's optical axis.
Method of the present invention is to utilize quantum communication acquisition to follow the acquisition and tracking camera of the system of taking aim at self, and the quantum transceiver module optical axis of quantum communication system and the parallel misalignment of acquisition and tracking camera self optical axis are carried out measurements and calculations.Acquisition and tracking camera is adjusted reorientation self central visual axis position automatically according to the measurements and calculations result, catches with the purpose of taking aim at system's self-calibrating visual axis field thereby reach satellite-ground quantum communication.Control program according to this principle design acquisition and tracking camera can be realized method of the present invention existing catching with taking aim in the system.
Use method of the present invention, quantum communication system can be caught with thick, the smart camera detection central visual axis position of following the tracks of of taking aim at system it, at any time (comprise that ground installation working site, satellite borne equipment are in the rail working site) and calibrate automatically, guarantee that tracking camera central visual axis is parallel with the height between the quantum transceiver module optical axis.The quantum communication system structure that can use the inventive method comprises as shown in Figure 1: light path 2 and the smart back light path (following the tracks of camera 3, light splitting piece 4 and corner reflector 5 by essence constitutes) of following the tracks of before quantum communications transceiver module 1, the thick tracking.By the control program of upgrading acquisition and tracking camera, add on-the-spot self calibration control and can realize the inventive method.The concrete steps of on-the-spot method for self-calibrating are:
1. close the preceding light path 2 of thick tracking, opening angle reflector 5 is launched the optical axis direction standard that the synchronous laser of quantum call duration time is used to refer to quantum communications module 1 from quantum communications module 1.
2. quantum time synchronized laser forms light spot image 7 in essence is followed the tracks of viewing field of camera 6, and smart acquisition and tracking camera extracts the center that obtains this hot spot.With this position coordinates as the center, visual field 8 after proofreading and correct, center, the preceding visual field of alternative corrective 9, as shown in Figure 2.
3. close the time synchronized laser of corner reflector 4 and quantum communications module 5, open the thick preceding light path 6 of following the tracks of, control smart follower and remain on zero-bit.Gather synchronization and slightly follow the tracks of one group of beacon light spot image of camera and essence tracking camera,, recomputate thick center, visual field of following the tracks of camera, location automatically in conjunction with thick, the smart corresponding relation of viewing field of camera and the essence tracking viewing field of camera center after the correction of following the tracks of.
Acquisition and tracking camera of the present invention has the following advantages:
1. applicability is strong, all can be suitable in satisfying the quantum communication system of structure shown in Figure 1, need not extra calibrator (-ter) unit.And can realize method of the present invention by the control program that improves acquisition and tracking camera, need not that quantum communication system is made hardware and change.
2. the precision of calibration is very high automatically, equals the smart detection accuracy of following the tracks of camera.
Description of drawings:
Fig. 1 is the quantum communication system structural representation that can use the inventive method.
Fig. 2 is the smart central visual axis position calibration method schematic diagram of following the tracks of camera.
Fig. 3 is to use the inventive method to carry out on-the-spot self-alignment quantum communication system exemplary construction schematic diagram.
Embodiment:
Use method of the present invention to follow the tracks of the on-the-spot self calibration of the camera optical axis in conjunction with an instance system shown in Figure 3, do further specifying.As spaceborne quantum communications terminal, communication distance is greater than 800km in the satellite-ground quantum communication system for this system applies, and system need have the tracking accuracy that is better than 20 μ rad, and the calibration accuracy of its optical system need be better than 1 μ rad.In this instance system, the thick tracking used two dimension pendulum mirror and the cassette structure of looking in the distance, and the detection accuracy of slightly following the tracks of camera is better than 3 μ rad, and the smart detection accuracy of following the tracks of camera is better than 0.4 μ rad.The optical parallelism of system transportation, launch or other process in the generation error that may change, inconvenience this moment is carried out manual calibration and should be adopted on-the-spot method for self-calibrating to calibrate automatically.The satellite-ground quantum communication system equipment carries out self calibration when start powers on or in the course of work as required, and its process is as follows:
1. system enters smart tracking field of view center and quantum communications module optical axis calibrator state.The opening angle speculum is adjusted thick follower and is made the other side's communication terminal (ground station) beacon beam not enter smart tracking field of view in order to avoid the light path calibration of influence back.
2. the time synchronized laser of emission quantum communication module utilizes it as smart tracking calibration light.Alignment light becomes light spot image on essence tracking camera behind color separation film (part transmission, reflection), corner reflector, bimodal filter (seeing through alignment light and the other side's communication terminal beacon beam), smart tracking camera lens.The smart camera of following the tracks of extracts spot center position, this position data of recorded and stored.Catch with the system that takes aim at this position as smart tracking field of view center, will be in system with taking aim at the miss distance that calculates the other side's communication terminal (ground station) beacon beam in the course of work in view of the above.Close the time synchronized laser of corner reflector and quantum communications module 5, smart tracking viewing field of camera center and quantum communications module optical axis calibrator finish.The registration accuracy of smart tracking field of view center and quantum communications module optical axis is better than 0.4 μ rad.
3. in order further to proofread and correct the error between thick, the smart tracking field of view center, system enters thick tracking viewing field of camera calibrate state.Make the smart quick scan mirror (FSM) of following the tracks of remain on zero-bit.Open thick the tracking and catch, catch the other side's communication terminal beacon beam and its guiding is entered smart tracking field of view with the parameter before the thick tracking correction with taking aim at closed loop.
4. gather thick tracking detector of synchronization and smart tracking detector and extract the one group of beacon hot spot center that obtains.According to the corresponding relation of thick, smart visual field and the smart tracking field of view center after proofreading and correct, recomputate thick viewing field of camera center and the recorded and stored of following the tracks of in location.Catch with the system that takes aim at this position as thick tracking field of view center, will take aim at the miss distance that calculates the other side's communication terminal beacon beam in the course of work in view of the above catching to follow with the system that takes aim at.Self-calibration process finishes, and the registration accuracy of thick tracking field of view center and quantum communications module optical axis is better than 3 μ rad.
Quantum communication acquisition is mainly determined by its smart visual field calibrate precision of following the tracks of camera with optical correction's precision of taking aim at system, so the precision of system self-calibration is about 0.4 μ rad.
Claims (1)
1. method for self-calibrating visual axis field of quantum communication system tracking camera is characterized in that may further comprise the steps:
A. close the preceding light path (2) of thick tracking, opening angle reflector (5) is launched the optical axis direction standard that the synchronous laser of quantum call duration time is used to refer to quantum communications module 1 from quantum communications module (1);
B. quantum time synchronized laser forms light spot image (7) in essence is followed the tracks of viewing field of camera (6), and smart acquisition and tracking camera extracts the center that obtains this hot spot, with this position coordinates as the center, visual field (8) after proofreading and correct, center, the preceding visual field of alternative corrective (9);
C. close the time synchronized laser of corner reflector (4) and quantum communications module (5), open the thick preceding light path (6) of following the tracks of, control smart follower and remain on zero-bit, gather synchronization and slightly follow the tracks of camera and smart one group of beacon light spot image following the tracks of camera, in conjunction with thick, the smart corresponding relation of viewing field of camera and the essence tracking viewing field of camera center after the correction of following the tracks of, recomputate thick center, visual field of following the tracks of camera, location automatically.
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Cited By (12)
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| CN101866183A (en) * | 2010-05-14 | 2010-10-20 | 长春理工大学 | Calibration device for rough tracking optical axis of laser space communication system |
| CN102185659A (en) * | 2011-03-23 | 2011-09-14 | 中国科学院上海技术物理研究所 | Quantum communication ATP (array transform processor) precise tracking system with optical axis self-calibrating function and calibrating method thereof |
| CN102901467A (en) * | 2012-11-07 | 2013-01-30 | 中国科学院长春光学精密机械与物理研究所 | Device for correcting parallelism degree of laser emission optical axis and capturing and tracking visual axis |
| CN103297150A (en) * | 2013-04-25 | 2013-09-11 | 中国科学院光电技术研究所 | Quantum communication fine tracking system |
| CN105444700A (en) * | 2015-12-25 | 2016-03-30 | 中国科学院光电研究院 | Multi-wavelength multi-optical axis parallelism detection device and detection method |
| CN108956101A (en) * | 2018-08-20 | 2018-12-07 | 中国科学院上海技术物理研究所 | A kind of measuring device and measurement method of the variation of the camera optical axis |
| CN109450532A (en) * | 2018-12-27 | 2019-03-08 | 中国电子科技集团公司第三十四研究所 | With the wireless light communication tracking system for being directed toward correction and it is directed toward antidote |
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| CN101866183A (en) * | 2010-05-14 | 2010-10-20 | 长春理工大学 | Calibration device for rough tracking optical axis of laser space communication system |
| CN102185659A (en) * | 2011-03-23 | 2011-09-14 | 中国科学院上海技术物理研究所 | Quantum communication ATP (array transform processor) precise tracking system with optical axis self-calibrating function and calibrating method thereof |
| CN102185659B (en) * | 2011-03-23 | 2014-04-09 | 中国科学院上海技术物理研究所 | Quantum communication ATP (array transform processor) precise tracking system with optical axis self-calibrating function and calibrating method thereof |
| CN102901467A (en) * | 2012-11-07 | 2013-01-30 | 中国科学院长春光学精密机械与物理研究所 | Device for correcting parallelism degree of laser emission optical axis and capturing and tracking visual axis |
| CN103297150A (en) * | 2013-04-25 | 2013-09-11 | 中国科学院光电技术研究所 | Quantum communication fine tracking system |
| CN103297150B (en) * | 2013-04-25 | 2015-12-09 | 中国科学院光电技术研究所 | Quantum communication fine tracking system |
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| CN105444700B (en) * | 2015-12-25 | 2017-10-31 | 中国科学院光电研究院 | A kind of many parallelism of optical axis detection means of multi-wavelength and detection method |
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