CN117097405A - Quantum secret communication satellite ground station system capable of being remotely attended and control method - Google Patents
Quantum secret communication satellite ground station system capable of being remotely attended and control method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
- H04L63/062—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key distribution, e.g. centrally by trusted party
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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Abstract
The application discloses a quantum secret communication satellite ground station system capable of being remotely attended and a control method, wherein the system comprises the following steps: the weather monitoring module is used for acquiring and monitoring real-time weather conditions of the ground station and judging whether the weather conditions are suitable for communication; the optical telescope module is used for receiving the signal light distributed by the downlink quantum key and the signal light communicated by the downlink laser and transmitting the signal light communicated by the uplink laser; the data processing module is used for classifying the received signal light, acquiring a corresponding key for the signal light distributed by the quantum key, encrypting the data to be transmitted by the key through a national encryption algorithm and transmitting the encrypted data to the satellite; for the signal light of the downlink laser communication, a corresponding key is found, and a plaintext of the data is obtained after decryption by using a national encryption algorithm; the remote control module is used for realizing the remote control and the on duty of the system. The application can solve the practical difficulty that the satellite ground station needs more personnel to control and operate, and can realize remote duty of quantum secret communication.
Description
Technical Field
The application relates to the technical field of quantum communication, in particular to a quantum secret communication satellite ground station system capable of being remotely attended and a control method.
Background
Quantum secret communication receives wide attention because it can realize absolute security on information theory at physical layer, and can resist quantum attack. Depending on the communication link, quantum secret communications can be classified into optical fiber quantum secret communications and satellite quantum secret communications.
Because the decoherence effect of the atmosphere on the quantum state is weak, the attenuation of the satellite quantum communication link is proportional to the square of the distance, and is far smaller than the optical fiber link with the same distance when the satellite quantum communication link is far away from the satellite quantum communication link, so the satellite quantum communication link becomes an important component of wide-area quantum communication. In order to realize the complete quantum communication function, a ground station system needs to be installed on the ground to be in butt joint with a quantum satellite, so that quantum key distribution and classical laser communication are completed.
In the past, the ground station system has larger volume, high construction cost and long deployment period by means of an astronomical platform. After comprehensively considering the prevention of rain erosion, the ground station needs to be added with corresponding protective measures, the system is complex, and the field cooperative operation of multiple people is needed, so that the large-scale deployment and application of the ground station are inconvenient. Meanwhile, the application of satellite quantum secret communication and the construction of the world integrated quantum Internet can be delayed.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a quantum secret communication satellite ground station system capable of being remotely attended and a control method.
The technical scheme adopted for solving the technical problems is as follows:
the application provides a quantum secret communication satellite ground station system capable of being remotely attended, which comprises: the system comprises a meteorological monitoring module, an optical telescope module, a data processing module and a remote control module which are arranged on a ground station; wherein:
the weather monitoring module is used for acquiring and monitoring real-time weather conditions of the ground station and judging whether the weather conditions are suitable for communication;
the optical telescope module is used for receiving the signal light distributed by the downlink quantum key and the signal light communicated by the downlink laser and transmitting the signal light communicated by the uplink laser;
the data processing module is connected with the weather monitoring module and the optical telescope module; the system comprises an optical telescope module, a quantum key distribution protocol, a data processing module, a satellite, a data processing module and a data processing module, wherein the optical telescope module is used for receiving signal light, classifying the signal light received by the optical telescope module, processing the received signal light distributed by the quantum key according to the quantum key distribution protocol, obtaining a corresponding key, encrypting data to be transmitted by a national encryption algorithm through the key, and transmitting the data to the satellite through an uplink laser communication channel of the optical telescope module; for the signal light of downlink laser communication received by the optical telescope module, a corresponding key is found, and a plaintext of data is obtained after decryption by using a national encryption algorithm;
and the remote control module is remotely connected with the data processing module, the weather monitoring module and the optical telescope module and is used for realizing the remote control and the on duty of the system.
Further, the system of the present application further comprises an optical dome within which both the optical telescope module and the data processing module are disposed.
Further, the remote control module comprises an optical dome control unit, wherein the optical dome control unit judges whether quantum secret communication is suitable or not according to real-time weather conditions acquired by the weather monitoring module, if so, the optical dome is controlled to be opened for quantum secret communication, and after the quantum secret communication is finished, the optical dome is closed; if not, the optical dome is closed.
Further, the meteorological monitoring module comprises an all-day cloud cover camera, a wind speed measuring instrument and a thermometer, and is used for monitoring real-time weather conditions of a ground station; the weather monitoring module is simultaneously connected with the Internet to acquire weather forecast conditions on the Internet, and comprehensively judges whether the communication is suitable or not by combining with real-time weather conditions monitored locally.
Furthermore, the optical telescope module is provided with the beacon light and the tracking camera which are coaxial with the signal light and are used for realizing the tracking of the optical telescope module.
Further, the remote control module comprises an automatic tracking unit for automatically reading satellite orbit data and polarization compensation data, and automatically starting or canceling the automatic tracking of the optical telescope module by combining the judgment result of the weather monitoring module; when the optical telescope module captures a satellite, the exposure time of the tracking camera and the intensity of uplink laser communication signals are automatically adjusted; the method for adjusting comprises the following steps:
when the light spot size of the signal light is larger than 50, the exposure time is automatically reduced until the light spot size is smaller than 50, and the exposure time is not required to be adjusted when the light spot size is smaller than 50; the signal light intensity is automatically adjusted to 33dB when the track height is smaller than 25 degrees, is automatically adjusted to 30dB when the track height is larger than 25 degrees and smaller than 45 degrees, and is automatically adjusted to 27dB when the track height is larger than 45 degrees.
The application provides a control method of a remote-guard quantum secret communication satellite ground station system, which comprises the following steps:
step 1, acquiring real-time weather conditions of a ground station, including the cloud cover, wind speed, temperature and humidity all the day, and judging whether satellite quantum secret communication is suitable or not by combining weather forecast conditions on the Internet; if the communication is suitable, the optical dome is opened by remote control, and the optical telescope is controlled to be opened for automatic tracking; if the communication is not suitable, terminating the flow;
step 2, after automatic tracking is started, satellite orbit data and polarization compensation data are read, and when satellite beacon light spots appear in the tracking camera, the exposure time and the beacon light intensity of the tracking camera are automatically adjusted;
step 3, starting satellite quantum secret communication, processing received signal light distributed by a quantum key according to a quantum key distribution protocol to obtain a corresponding key, encrypting data to be transmitted by a national secret algorithm through the key, and transmitting the data to the satellite through an uplink laser communication channel of an optical telescope module; for the signal light of downlink laser communication received by the optical telescope module, a corresponding key is found, and a plaintext of data is obtained after decryption by using a national encryption algorithm;
and 4, after the satellite quantum secret communication is finished, remotely controlling to close the optical dome.
Further, in the step 2 of the present application, in the method for detecting whether the satellite beacon light spot appears in the tracking camera, the method further includes:
if the satellite orbit height is higher than 10 degrees and the satellite beacon light spot is not detected in the tracking camera, acquiring relevant cloud cover information, and judging whether cloud cover shielding exists or not; if yes, continuing waiting; if not, execution continues.
Further, in the step 3 of the present application, during the process of performing satellite quantum secret communication, the count of the single photon detector of the optical telescope module is continuously increased, if the count of the single photon detector is not increased within a certain period of time, it indicates that there is a thin cloud which is not observed by naked eyes and a cloud amount camera in the sky, and after waiting for a certain period of time, if the count is increased, the communication is continued; if the count is not increased, checking whether the communication flow is wrong or not, and performing fault checking.
The present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method for controlling a remotely attended quantum secret communication satellite earth station system described above.
The application has the beneficial effects that:
1. the application provides a satellite-ground quantum communication system capable of realizing remote duty through a remote control module, wherein the existing satellite-ground quantum communication is manually operated, so that people are required to judge weather on site, and a plurality of inconveniences are caused.
2. The weather monitoring module provided by the application provides a more intelligent weather condition judging method suitable for quantum communication, combines local real-time monitoring weather data and Internet weather data to comprehensively judge whether the weather requirements of the quantum communication are met, and does not need to judge weather on site by people.
3. The remote control module can intelligently control the opening and closing of the optical dome according to the result of the weather monitoring module, does not need manual operation, and is more convenient and intelligent.
4. The data processing module provided by the application provides different signal light classification processing methods, and different processing methods and processing flows are adopted for the signal light distributed by the received downlink quantum key and the signal light communicated by the downlink laser, so that the processing efficiency is higher, and the encoding and decoding accuracy is higher.
Drawings
The application will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a remotely attended quantum secret communication satellite ground station system of an embodiment of the present application;
FIG. 2 is a flow chart of remotely attended satellite quantum secret communication according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Example 1
As shown in fig. 1, in order to overcome the problem that the ground station needs to operate cooperatively on site by multiple persons, the embodiment of the application adopts a quantum communication satellite ground station system capable of being remotely attended. The system comprises the following components: the system comprises a meteorological monitoring module, an optical telescope module, a data processing module and a remote control module.
The meteorological monitoring module comprises an all-day cloud cover camera, a wind speed measuring instrument, a thermometer and the like and is used for monitoring real-time weather conditions of the ground station. The weather monitoring module can also be connected to the Internet at the same time to acquire weather forecast conditions on the Internet, and is combined with local monitoring data to comprehensively judge whether the weather conditions are suitable for experiments through an algorithm.
In a preferred embodiment of the present application, the satellite transit trajectories and times are first reviewed. Checking whether the time is rainy, if so, closing the experiment, otherwise, the next step. Checking whether the upper air is blocked according to the track and the cloud cover, if so (note that the track is required to be free of white cloud and can not be made thin, if satellite quantum secret communication is available, the effect is poor and even fails), closing the experiment; if the cloud and the rain do not exist, the local meteorological monitoring data are checked, whether cloud and rain appear when a quantum experiment is performed is predicted, and if the cloud and the rain appear, the experiment is predicted to be closed. Otherwise, the device is turned on.
The optical telescope module is the core of satellite quantum secret communication, and is mainly used for receiving signal light distributed by a downlink quantum key and signal light communicated by downlink laser and transmitting signal light communicated by uplink laser.
In the preferred embodiment of the application, in order to ensure that the ground station can accurately receive various signal lights on the satellite, the optical telescope needs to be provided with a beacon light and a tracking camera which are coaxial with the signal lights at the same time, and the optical telescope is used for accurate tracking of the telescope. In order to ensure time synchronization during quantum key distribution, the telescope needs to have the function of receiving the synchronization light. In actual operation, the beacon light and the synchronization light can be multiplexed with classical communication signals. In order to ensure that the optical telescope is protected from the effects of rain and snow, it is often necessary to provide an optical dome. The dome is controlled by a remote control module.
The data processing module mainly comprises various signal light detection devices and data processing software and hardware. The data processing module firstly needs to receive all the arrived photoelectric signals for classification processing. And processing the received quantum key distribution signal according to a quantum key distribution protocol flow to acquire a corresponding key. The data to be transmitted is encrypted by the cryptographic algorithm through the key, and then is sent to the satellite through an uplink laser communication channel. Meanwhile, for the received downlink laser communication signals, a corresponding key needs to be found first, and plaintext is obtained after decryption by using an algorithm.
In a preferred embodiment of the application, the data processing module may be placed with the telescope in an optical dome, such as near the telescope base, for greater integration of the overall system.
The remote control module mainly has two functions, namely, controlling the dome of the telescope and remotely supervising or operating the telescope tracking process. The dome control is mainly judged through data acquired by the weather monitoring module, if a quantum secret communication flow is properly carried out, the dome is opened, and after the flow is finished, the dome is closed; otherwise, the dome is kept closed, and the process is canceled. The telescope tracking can adopt a full-automatic mode, namely, satellite orbit data and polarization compensation data are automatically read, a tracking process is automatically started/canceled according to a data judgment result of the weather monitoring module, and after the system captures satellites, the exposure time of a tracking camera is automatically adjusted to adapt to the intensity of the beacon light. When the experimenter perceives the abnormality, the experimenter can intervene or terminate the experiment in time.
In a preferred embodiment of the present application, the remote control module includes an automatic tracking unit for automatically reading satellite orbit data and polarization compensation data, and automatically starting or canceling the automatic tracking of the optical telescope module in combination with the judgment result of the weather monitoring module; and after the optical telescope module captures the satellite, the exposure time of the tracking camera and the intensity of the uplink laser communication signal light are automatically adjusted. The method for adjusting comprises the following steps:
when the light spot size of the signal light is larger than 50, the exposure time is automatically reduced until the light spot size is smaller than 50, and the exposure time is not required to be adjusted when the light spot size is smaller than 50; the signal light intensity is automatically adjusted to 33dB when the track height is smaller than 25 degrees, is automatically adjusted to 30dB when the track height is larger than 25 degrees and smaller than 45 degrees, and is automatically adjusted to 27dB when the track height is larger than 45 degrees.
Because the tracking of the optical telescope needs to be free of shielding, the weather monitoring module and the telescope module should be arranged on the roof of a city building or in an open region. At the same time, the telescope module intersects other modules, should be at a relatively high point, in order to prevent occlusion of locally adjacent devices. Meanwhile, considering that the automatic opening and closing of the arc top needs to occupy a certain space, the whole layout can be referred to as fig. 1.
Example 2
As shown in fig. 2, an embodiment of the present application provides a control method of a remotely attended quantum secret communication satellite ground station system, which includes the following steps:
step 1, acquiring real-time weather conditions of a ground station, including the cloud cover, wind speed, temperature and humidity all the day, and judging whether satellite quantum secret communication is suitable or not by combining weather forecast conditions on the Internet; if the communication is suitable, the optical dome is opened by remote control, and the optical telescope is controlled to be opened for automatic tracking; if the communication is not suitable, terminating the flow;
step 2, after automatic tracking is started, satellite orbit data and polarization compensation data are read, and when satellite beacon light spots appear in the tracking camera, the exposure time and the beacon light intensity of the tracking camera are automatically adjusted;
step 3, starting satellite quantum secret communication, processing received signal light distributed by a quantum key according to a quantum key distribution protocol to obtain a corresponding key, encrypting data to be transmitted by a national secret algorithm through the key, and transmitting the data to the satellite through an uplink laser communication channel of an optical telescope module; for the signal light of downlink laser communication received by the optical telescope module, a corresponding key is found, and a plaintext of data is obtained after decryption by using a national encryption algorithm;
and 4, after the satellite quantum secret communication is finished, remotely controlling to close the optical dome.
Example 3
In the embodiment of the application, the specific quantum communication flow is as follows:
1. in the initial preparation stage of the experiment, the remote control system acquires weather parameters such as the total daily cloud cover, the wind speed, the temperature, the humidity and the like of the ground station through the weather monitoring module, and judges whether the satellite quantum secret communication flow is suitable to be carried out according to weather data on the Internet. If so, the dome is opened by the remote control system, and an instruction is given to the optical telescope to start a tracking process. If not, the process is terminated and no other processes are performed.
2. After the optical telescope starts the tracking process, track data and polarization compensation data can be automatically read. After satellite beacon light spots appear in the tracking camera, the exposure time is adjusted in a self-adaptive mode, and the quantum key distribution flow and the laser communication flow based on the quantum key are synchronously started until the experiment is finished. If the satellite orbit height is higher than 10 degrees and the satellite beacon light spot is not observed in the camera, the relevant cloud cover information is acquired through the weather monitoring system, whether cloud cover shielding exists or not is judged, if yes, waiting is continued, if not, whether the corresponding flow is checked for errors needs to be confirmed, if errors are corrected, and if not, the experiment is continued. After beacon light appears in the tracking camera, quantum communication starts, the count of the single photon detector is obviously increased, and when the detector signal is not obviously increased, the side surface reflects that the sky has thin clouds, and the naked eyes and the cloud camera do not observe. If the flow is carried out smoothly, quantum secret communication with the satellite can be successfully completed through the ground station system.
3. After the satellite quantum secret communication is finished, related information is acquired, and then the dome is closed through the remote control system. If abnormality occurs in the experimental process, corresponding measures are taken to solve the problem.
Example 4
The embodiment of the application provides a computer readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, realizes the steps of the control method of the remote-on-duty quantum secret communication satellite ground station system.
It should be understood that the sequence numbers of the steps in the above embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present application. Modifications and variations may occur to those skilled in the art in light of the foregoing description, and all such modifications and variations are intended to be included within the scope of the following claims.
Claims (10)
1. A remotely attended quantum secret communication satellite ground station system, the system comprising: the system comprises a meteorological monitoring module, an optical telescope module, a data processing module and a remote control module which are arranged on a ground station; wherein:
the weather monitoring module is used for acquiring and monitoring real-time weather conditions of the ground station and judging whether the weather conditions are suitable for communication;
the optical telescope module is used for receiving the signal light distributed by the downlink quantum key and the signal light communicated by the downlink laser and transmitting the signal light communicated by the uplink laser;
the data processing module is connected with the weather monitoring module and the optical telescope module; the system comprises an optical telescope module, a quantum key distribution protocol, a data processing module, a satellite, a data processing module and a data processing module, wherein the optical telescope module is used for receiving signal light, classifying the signal light received by the optical telescope module, processing the received signal light distributed by the quantum key according to the quantum key distribution protocol, obtaining a corresponding key, encrypting data to be transmitted by a national encryption algorithm through the key, and transmitting the data to the satellite through an uplink laser communication channel of the optical telescope module; for the signal light of downlink laser communication received by the optical telescope module, a corresponding key is found, and a plaintext of data is obtained after decryption by using a national encryption algorithm;
and the remote control module is remotely connected with the data processing module, the weather monitoring module and the optical telescope module and is used for realizing the remote control and the on duty of the system.
2. The remotely attended quantum secret communication satellite ground station system of claim 1, further comprising an optical dome, the optical telescope module and the data processing module each disposed within the optical dome.
3. The remotely attended quantum secret communication satellite ground station system of claim 2, wherein the remote control module comprises an optical dome control unit, the optical dome control unit judges whether quantum secret communication is suitable or not according to real-time weather conditions obtained by the weather monitoring module, if so, the optical dome is controlled to be opened for quantum secret communication, and after the quantum secret communication is finished, the optical dome is closed; if not, the optical dome is closed.
4. The remotely attended quantum secret communication satellite ground station system of claim 1 wherein the weather monitoring module comprises an all-day cloud cover camera, a wind speed measuring instrument, a thermometer for monitoring real-time weather conditions of the ground station; the weather monitoring module is simultaneously connected with the Internet to acquire weather forecast conditions on the Internet, and comprehensively judges whether the communication is suitable or not by combining with real-time weather conditions monitored locally.
5. The remotely attended quantum secret communication satellite ground station system of claim 1 wherein the optical telescope module is provided with a beacon light and a tracking camera coaxial with the signal light for realizing the tracking of the optical telescope module.
6. The remotely attended quantum secret communication satellite ground station system according to claim 5, wherein the remote control module comprises an automatic tracking unit for automatically reading satellite orbit data and polarization compensation data and automatically starting or canceling the automatic tracking of the optical telescope module by combining the judging result of the weather monitoring module; when the optical telescope module captures a satellite, the exposure time of the tracking camera and the intensity of uplink laser communication signals are automatically adjusted; the method for adjusting comprises the following steps:
when the light spot size of the signal light is larger than 50, the exposure time is automatically reduced until the light spot size is smaller than 50, and the exposure time is not required to be adjusted when the light spot size is smaller than 50; the signal light intensity is automatically adjusted to 33dB when the track height is smaller than 25 degrees, is automatically adjusted to 30dB when the track height is larger than 25 degrees and smaller than 45 degrees, and is automatically adjusted to 27dB when the track height is larger than 45 degrees.
7. The control method of the remotely-attended quantum secret communication satellite ground station system is characterized by comprising the following steps of:
step 1, acquiring real-time weather conditions of a ground station, including the cloud cover, wind speed, temperature and humidity all the day, and judging whether satellite quantum secret communication is suitable or not by combining weather forecast conditions on the Internet; if the communication is suitable, the optical dome is opened by remote control, and the optical telescope is controlled to be opened for automatic tracking; if the communication is not suitable, terminating the flow;
step 2, after automatic tracking is started, satellite orbit data and polarization compensation data are read, and when satellite beacon light spots appear in the tracking camera, the exposure time and the beacon light intensity of the tracking camera are automatically adjusted;
step 3, starting satellite quantum secret communication, processing received signal light distributed by a quantum key according to a quantum key distribution protocol to obtain a corresponding key, encrypting data to be transmitted by a national secret algorithm through the key, and transmitting the data to the satellite through an uplink laser communication channel of an optical telescope module; for the signal light of downlink laser communication received by the optical telescope module, a corresponding key is found, and a plaintext of data is obtained after decryption by using a national encryption algorithm;
and 4, after the satellite quantum secret communication is finished, remotely controlling to close the optical dome.
8. The method for controlling a remotely attended quantum secret communication satellite earth station system according to claim 7, wherein the step 2, in the method for detecting whether the satellite beacon light spot appears in the tracking camera, further comprises:
if the satellite orbit height is higher than 10 degrees and the satellite beacon light spot is not detected in the tracking camera, acquiring relevant cloud cover information, and judging whether cloud cover shielding exists or not; if yes, continuing waiting; if not, execution continues.
9. The method according to claim 7, wherein the step 3 is that, during the satellite quantum secret communication, the count of the single photon detector of the optical telescope module is continuously increased, if the count of the single photon detector is not increased within a certain period of time, the single photon detector indicates that the sky has thin clouds which are not observed by naked eyes and a cloud camera, and after waiting a certain period of time, if the count is increased, the communication is continued; if the count is not increased, checking whether the communication flow is wrong or not, and performing fault checking.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor performs the steps of the method of controlling a remotely attended quantum secret communication satellite ground station system according to any one of claims 7 to 9.
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