CN117215172B - Satellite time service method and device, satellite time service system and storage medium - Google Patents
Satellite time service method and device, satellite time service system and storage medium Download PDFInfo
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- CN117215172B CN117215172B CN202311045923.4A CN202311045923A CN117215172B CN 117215172 B CN117215172 B CN 117215172B CN 202311045923 A CN202311045923 A CN 202311045923A CN 117215172 B CN117215172 B CN 117215172B
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000001514 detection method Methods 0.000 claims description 91
- 238000004590 computer program Methods 0.000 claims description 19
- 238000001228 spectrum Methods 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000003062 neural network model Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000012549 training Methods 0.000 description 5
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application is applicable to the technical field of radio and provides a satellite time service method, a satellite time service device, a satellite time service system and a storage medium, wherein the method comprises the following steps: when the initial time service information is detected to be interfered, determining a first interference level; the first interference level is used for representing the interference degree of initial time service information; if the first interference level is greater than the set level, acquiring pre-stored ephemeris data of the satellite system; according to the ephemeris data, calculating to obtain the current position information of each satellite in the satellite system; and determining target time service information of the equipment to be time service according to the current position information of each satellite. Compared with the prior art, when the interference degree of the initial time service information is determined to be large, final target time service information of the equipment to be time service is determined according to the pre-stored ephemeris data, so that the target time service information is utilized to time service and protect the equipment to be time service, and time service precision and time service reliability are improved.
Description
Technical Field
The application belongs to the technical field of radio, and particularly relates to a satellite time service method, a satellite time service device, a satellite time service system and a storage medium.
Background
With the rapid development of modern information technology, more and more application scenes need time synchronization services with high precision and high reliability. The Beidou/GPS global positioning system is used as an important satellite time service system and is widely applied in various fields. However, the Beidou/GPS signals are very susceptible to intentional or unintentional interference due to the weaker ground signal.
In the prior art, the received time service signal is generally subjected to real-time interference detection, and after the time service signal is detected to be interfered, an interference timing model is directly adopted to realize time service of time service equipment. The interference timing model usually realizes the time service of the device to be time-serviced through the atomic clock carried by the device to be time-serviced and other time service sources after the atomic clock is frequency-calibrated, so that the final time service inaccuracy can be caused when the atomic clock carried by the device to be time-serviced and the time service signals sent by the other time service sources are combined to frequency-calibrate the atomic clock when signal interference exists in the process of the time service signals sent by the other time service sources in the prior art, and the time service precision and the time service reliability are reduced.
Disclosure of Invention
The embodiment of the application provides a satellite time service method, a satellite time service device, a satellite time service system and a storage medium, and time service precision and time service reliability are improved.
In a first aspect, an embodiment of the present application provides a satellite time service method, including:
determining a first interference level when it is detected that initial timing information from the satellite system is interfered; the first interference level is used for representing the interference degree suffered by the initial time service information;
if the first interference level is greater than a set level, acquiring pre-stored ephemeris data of the satellite system;
according to the ephemeris data, calculating to obtain the current position information of each satellite in the satellite system;
and determining target time service information of the equipment to be time service according to the current position information of each satellite.
Optionally, before determining the first interference level when the initial timing information from the satellite system is detected to be interfered, the method further includes:
receiving a time service data packet sent by the satellite system, wherein the time service data packet comprises the initial time service information;
detecting the validity of the time service data packet to obtain a detection result;
if the detection result is that the detection is not passed, determining a first time when the time service data packet is received, and detecting whether the initial time service information is interfered or not according to the first time.
Optionally, the time service data packet includes a plurality of sub data packets, and the first time includes an actual receiving time corresponding to each sub data packet; the detecting whether the initial time service information is interfered according to the first time includes:
if the actual receiving time corresponding to any one of the plurality of sub-data packets is greater than the preset difference value, determining that the initial time service information is interfered.
Optionally, the detecting whether the initial time service information is interfered according to the first time further includes:
traversing and calculating the time interval between the actual receiving times corresponding to every two adjacent sub-data packets;
and if at least one time interval longer than the set time length exists in each time interval, determining that the initial time service information is interfered.
Optionally, after detecting the validity of the time service data packet to obtain a detection result, the method further includes:
if the detection result is that the detection is not passed, determining the signal to noise ratio of the corresponding satellite signal when the time service data packet is received;
And if the signal-to-noise ratio is smaller than a set threshold, determining that the initial time service information is interfered.
Optionally, after detecting the validity of the time service data packet to obtain a detection result, the method further includes:
if the detection result is that the detection is not passed, determining the frequency spectrum information of the corresponding satellite signal when the time service data packet is received;
and if the frequency spectrum information accords with the set interference judging condition, determining that the initial time service information is interfered.
Optionally, after determining the target time service information of the to-be-time service device according to the current position information of each satellite, the method further includes:
acquiring current time service information sent by the satellite system;
if the second interference level corresponding to the current time service information is smaller than or equal to the set level, determining the current time service information as the latest time service information of the to-be-time service equipment; the second interference level is used for representing the interference degree suffered by the current time service information.
In a second aspect, an embodiment of the present application provides a satellite time service apparatus, including:
the first determining unit is used for determining a first interference level when detecting that initial time service information from the satellite system is interfered; the first interference level is used for representing the interference degree suffered by the initial time service information;
The first acquisition unit is used for acquiring the pre-stored ephemeris data of the satellite system if the first interference level is greater than a set level;
the first calculation unit is used for calculating current position information of each satellite in the satellite system according to the ephemeris data;
and the second determining unit is used for determining target time service information of the equipment to be time service according to the current position information of each satellite.
In a third aspect, an embodiment of the present application provides a satellite time service system, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the satellite timing method according to any one of the first aspects when executing the computer program.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements a satellite timing method as set forth in any one of the first aspects above.
In a fifth aspect, embodiments of the present application provide a computer program product which, when run on a satellite timing system, enables the satellite timing system to perform the satellite timing method according to any one of the first aspects.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
according to the satellite time service method provided by the embodiment of the application, when the initial time service information from the satellite system is detected to be interfered, a first interference level is determined; when the first interference level is detected to be larger than the set level, namely the interference degree of the initial time service information is larger, compared with the prior art that the atomic clock is subjected to frequency correction through the atomic clock carried by the equipment to be time service and other time service sources to realize time service of the time service equipment, the method and the device acquire the pre-stored ephemeris data of the satellite system; and determining target time service information of the equipment to be time-serviced according to the ephemeris data, so as to utilize the target time service information to time service and protect the equipment to be time-serviced. Because the ephemeris data are stored in advance, signal interference in the process of sending signals by other time service sources is avoided, and the final time service precision and the time service reliability are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a satellite timing system according to an embodiment of the present application;
FIG. 2 is a flowchart of a satellite timing method according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a training process of an interference detection model according to an embodiment of the present application
FIG. 4 is a flowchart of a satellite timing method according to another embodiment of the present disclosure;
FIG. 5 is a flowchart illustrating a satellite timing method according to another embodiment of the present disclosure;
FIG. 6 is a flowchart of a satellite timing method according to another embodiment of the present disclosure;
FIG. 7 is a flowchart of a satellite timing method according to another embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a satellite timing device according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a satellite timing system according to another embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Referring to fig. 1, fig. 1 is a flowchart of an implementation of a satellite timing system according to an embodiment of the present application. In the embodiment of the present application, the satellite time service system 10 includes: the device comprises a first time service module 11, an interference detection module 12 and a second time service module 13. The satellite time service module 11 is in wireless communication connection with the interference detection module 12, and the interference detection module 12 is in wireless communication connection with the second time service module 13.
The satellite timing module 11 is configured to receive a satellite signal sent by the satellite system 20, and determine initial timing information according to the satellite signal. The satellite system 20 may be a beidou system, or may be a global positioning system (Global Positioning System, GPS), and based on this, the satellite signal may be a beidou signal, or may be a GPS signal.
The satellite system 20 is connected to the satellite time service system 10 in wireless communication, and the satellite system 20 includes a plurality of satellites 21 (only four satellites are shown in the figure).
The interference detection module 12 is configured to detect an interference level to which the initial timing information is subjected, and determine a first interference level. The first interference level is used for representing the interference degree suffered by the initial time service information.
The second timing module 13 is configured to obtain pre-stored ephemeris data of the satellite system 20 when the first interference level is detected to be greater than the set level, and determine final target timing information of the to-be-timing device 30 according to the ephemeris data.
The to-be-time service device 30 is connected to the satellite time service system 10 in a wireless communication manner, and the to-be-time service device 30 may be various electronic devices and computer devices on the ground that require a time to use.
In this embodiment, how to determine the final target time service information of the to-be-time service device 30 according to the pre-stored ephemeris data can be detailed in the description of steps S102 to S104 in the satellite time service method shown in fig. 3, and the details are not repeated here.
In one embodiment of the present application, the first time service module 11 may include: a signal receiving unit and a time service information determining unit. The signal receiving unit is configured to receive a satellite signal sent by the satellite system 20, and the timing information determining unit is configured to determine initial timing information according to the satellite signal.
In this embodiment, the signal receiving unit may use a plurality of receiving terminals of high performance beidou/GPS signals, and each receiving terminal is installed at a different position, angle and altitude to receive satellite signals sent by a plurality of satellites 21 in the satellite system 20, for example: signals of a plurality of navigation systems such as Beidou and GPS, GLONASS, galileo. Meanwhile, in order to further ensure the reliability of the satellite time service system 10 and further reduce the influence of signal distortion and interference, a Low Noise Amplifier (LNA) with a noise coefficient lower than 1.5dB, an antenna with a gain of more than 3dBi and a front-end filter with an out-of-band rejection of more than 30dB can be selected as a guarantee for receiving satellite signals by the signal receiving unit.
In another embodiment of the present application, the satellite time service system 10 may further include an external communication interface unit, a data storage unit, a secure encryption unit, and the like, so that the satellite time service system 10 is more complete and adapted to different application environments.
Referring to fig. 2, fig. 2 is a flowchart illustrating an implementation of a satellite timing method according to an embodiment of the present application. In this embodiment of the present application, the main implementation body of the satellite time service method is a satellite time service system.
As shown in fig. 2, the satellite time service method provided in an embodiment of the present application may include S101 to S104, which are described in detail as follows:
in S101, when it is detected that the initial timing information from the satellite system is interfered, determining a first interference level; the first interference level is used for representing the interference degree suffered by the initial time service information.
In this embodiment of the present application, after receiving a satellite signal sent by a satellite system, the satellite time service system may determine initial time service information according to the satellite signal.
After the satellite time service system obtains the initial time service information, whether the initial time service information is interfered or not can be detected, and an interference detection result is obtained.
In some possible embodiments, the satellite timing system may input the satellite signal to a trained interference detection model for processing, so as to obtain an interference detection result of the initial timing information.
In this embodiment, the interference detection model may be obtained by training a neural network model that is built in advance based on a preset sample set. Each sample data in the preset sample set comprises a sample signal and an interference detection result corresponding to the sample signal. When training the pre-constructed neural network model, taking the sample signal in each sample data as the input of the neural network model, taking the interference detection result corresponding to the sample signal in each sample data as the output of the neural network model, and training the neural network model to learn the corresponding relation between all possible signals and the interference detection result and taking the trained neural network model as the interference detection model.
For example, referring to fig. 3, fig. 3 is a schematic diagram of a training process of an interference detection model according to an embodiment of the present application.
In this embodiment of the present application, the satellite time service system may determine, according to the interference detection result, an interference degree to which the initial time service information is subjected, so as to determine a first interference level of the initial time service information. The first interference level is used for representing the interference degree suffered by the initial time service information.
It should be noted that the first interference level is directly proportional to the interference level, that is, the higher the first interference level, the greater (i.e., more serious) the interference level, and the lower the first interference level, the lower (i.e., more slight) the interference level.
The first interference level includes, but is not limited to: a first level, a second level, a third level, and a fourth level. The first level is used for representing that the interference degree of the initial time service information is 0, the second level is used for representing that the interference degree of the initial time service information is small, the third level is used for representing that the interference degree of the initial time service information is medium, and the first level is used for representing that the interference degree of the initial time service information is large.
After obtaining the first interference level under the satellite time service system, the first interference level can be compared with the set level. The setting level may be determined according to actual needs, and is not limited herein. Illustratively, the set level may be a second level.
In one embodiment of the present application, the satellite timing system may perform steps S102 to S104 when the first interference level is detected to be greater than the set level.
In another embodiment of the present application, when the satellite time service system detects that the first interference level is less than or equal to the set level, it indicates that the interference level received by the initial time service information is small and negligible, so that the satellite time service system may continue to time service the device to be time-serviced according to the initial time service information.
In S102, if the first interference level is greater than a set level, ephemeris data of the satellite system stored in advance is acquired.
In this embodiment of the present application, when the satellite timing system detects that the first interference level is greater than the set level, it indicates that the interference level received by the initial timing information is greater and cannot be ignored, so that the satellite timing system may acquire the ephemeris data of the pre-stored satellite system.
In practical applications, ephemeris data is also called an ephemeris, which is a table of star orbit parameters, i.e. list data is used to indicate the predetermined position of a star at regular intervals or the predetermined position of an artificial satellite at regular intervals.
It should be noted that, the ephemeris data may be the most recent ephemeris data before the first interference level is detected to be greater than the set level.
In S103, current position information of each satellite in the satellite system is calculated according to the ephemeris data.
In this embodiment of the present application, after obtaining the pre-stored ephemeris data of the satellite system, the satellite time service system may input the ephemeris data into a preset satellite orbit calculation model to perform calculation, so as to obtain current position information of each satellite in the satellite system.
In practical applications, the satellite orbit calculation model may be an SGP4 model or an SDP4 model, which is not limited herein.
In S104, determining target time service information of the to-be-time service device according to the current position information of each satellite.
In this embodiment of the present application, after obtaining current position information of each satellite in the satellite system, the satellite time service system may calculate, according to the current position information of each satellite and a local clock of the device to be time-serviced, a propagation time of a satellite signal sent by each satellite, and then calculate, according to a propagation time of a satellite signal sent by each satellite to the device to be time-serviced, a pseudo range between each satellite and the device to be time-serviced, respectively.
After the satellite time service system obtains the pseudo ranges between each satellite and the equipment to be time-serviced, the target time service information of the equipment to be time-serviced can be determined according to the trilateration method and each pseudo range.
Based on the time information, the satellite time information system can utilize the target time information to realize time protection of the time equipment.
The satellite time service system can calibrate the local clock of the equipment to be time-serviced according to the target time service information, so as to complete time service of the equipment to be time-serviced, and further achieve time service protection of the equipment to be time-serviced.
As can be seen from the above, in the satellite time service method provided by the embodiment of the present application, when the initial time service information from the satellite system is detected to be interfered, a first interference level is determined; when the first interference level is detected to be larger than the set level, namely the interference degree of the initial time service information is larger, compared with the prior art that the atomic clock is subjected to frequency correction through the atomic clock carried by the equipment to be time service and other time service sources to realize time service of the time service equipment, the method and the device acquire the pre-stored ephemeris data of the satellite system; and determining target time service information of the equipment to be time-serviced according to the ephemeris data, so as to utilize the target time service information to time service and protect the equipment to be time-serviced. Because the ephemeris data are stored in advance, signal interference in the process of sending signals by other time service sources is avoided, and the final time service precision and the time service reliability are improved.
Referring to fig. 4, fig. 4 is a schematic diagram of a satellite timing method according to another embodiment of the present application. In contrast to the embodiment corresponding to fig. 2, in this embodiment, before S101, it is further possible to detect whether the initial timing information is interfered through steps S201 to S203, which is described in detail as follows:
in S201, a time service data packet sent by the satellite system is received, where the time service data packet includes the initial time service information.
In S202, the validity of the time service data packet is detected, and a detection result is obtained.
In this embodiment, the satellite timing system may receive a timing data packet corresponding to a satellite signal sent by the satellite system. Wherein, the time service data packet comprises initial time service information.
In some possible embodiments, the timing data packet may also include ephemeris data of the satellite system, status information of the satellite system, and the like.
It should be noted that the validity of the time service data packet includes, but is not limited to, the integrity and correctness of the time service data packet.
The detection results include, but are not limited to: pass detection and fail detection.
Based on this, in some possible embodiments, the satellite timing system may calculate a Checksum (Checksum) of the timing packet, that is, complete the detection of the validity of the timing packet, to obtain a detection result.
In this embodiment, when the satellite time service system detects that the checksum of the time service data packet does not conform to the expectation, it may determine that the detection result is that the detection is failed; and when the satellite time service system detects that the checksum of the time service data packet accords with the expected checksum, the detection result can be determined to be the detection passing.
In other possible embodiments, the satellite timing system may further detect validity of the timing data packet based on a cyclic redundancy check manner, so as to obtain a detection result.
In this embodiment, when the satellite timing system detects that the check code obtained based on the cyclic redundancy check mode does not conform to the expectation, it may determine that the detection result is that the detection is failed; and when the check code obtained based on the cyclic redundancy check mode is detected to be in accordance with the expected check code, determining that the detection result is the passing check code.
Based on this, in one embodiment of the present application, the satellite timing system may execute step S203 when detecting that the detection result is that the detection fails.
In another embodiment of the present application, when the satellite time service system detects that the detection result is that the detection result passes, it indicates that the time service data packet is valid, that is, the time service data packet is complete and correct, that is, the initial time service information included in the time service data packet is not interfered, so that the satellite time service system can directly time service the time service equipment according to the initial time service information.
In S203, if the detection result is that the detection does not pass, determining a first time when the time service data packet is received, and detecting whether the initial time service information is interfered according to the first time.
In this embodiment, when the satellite timing system detects that the detection result is that the detection fails, it indicates that the timing data packet is invalid, that is, the timing data packet is not complete and/or correct, that is, the initial timing information included in the timing data packet is interfered, so the satellite timing system may determine a first time when the timing data packet is received, and detect whether the initial timing information is interfered according to the first time.
In one embodiment of the present application, the time service data packet includes a plurality of sub-data packets, and the corresponding first time includes an actual receiving time corresponding to each sub-data packet, so the satellite time service system may detect whether the initial time service information is interfered according to the following steps, which are described in detail below:
if the actual receiving time corresponding to any one of the plurality of sub-data packets is greater than the preset difference value, determining that the initial time service information is interfered.
In this embodiment, for any one sub-packet, the satellite time service system may calculate a difference between an actual receiving time corresponding to the sub-packet and a pre-stored expected receiving time corresponding to the sub-packet, and compare the difference with a set difference. The expected receiving time and the set difference value may be determined according to actual needs, and are not limited herein.
Based on the above, the satellite time service system can determine that the initial time service information is interfered when detecting that the actual receiving time corresponding to any one of the plurality of sub-data packets exists and the difference between the expected receiving time corresponding to the pre-stored sub-data packet is larger than the set difference.
In another embodiment of the present application, the time service data packet includes a plurality of sub-data packets, and the corresponding first time includes an actual receiving time corresponding to each sub-data packet, so the satellite time service system may further detect whether the initial time service information is interfered through steps S301 to S302 shown in fig. 5, which is described in detail as follows:
in S301, the time interval between the actual receiving times corresponding to the sub-packets adjacent to each other is calculated by traversal.
In S302, if at least one time interval greater than a set duration exists in each time interval, it is determined that the initial time service information is interfered.
In this embodiment, the satellite time service system may traverse and calculate the time intervals between the actual receiving times corresponding to every two adjacent sub-data packets, and compare each time interval with the set duration one by one. The set duration may be determined according to actual needs, which is not limited herein.
The satellite time service system detects that at least one time interval longer than the set time length exists in each time interval, and the abnormal delay fluctuation exists in the transmission process of the time service data packet, so that the satellite time service system can determine that the initial time service information is interfered.
As can be seen from the above, in the satellite time service method provided in this embodiment, after receiving the time service data packet including the initial time service information sent by the satellite system, the validity of the time service data packet can be detected, so as to obtain a detection result; and when the detection result is that the detection is not passed, namely the initial time service information is possibly interfered, the first time for receiving the time service data packet can be determined, and whether the initial time service information is interfered or not is detected according to the first time, so that the detection accuracy of whether the initial time service information is interfered or not is improved.
Referring to fig. 6, fig. 6 is a schematic diagram of a satellite timing method according to another embodiment of the present application. In contrast to the embodiment corresponding to fig. 4, after S202, the present embodiment may further detect whether the initial timing information is interfered through steps S401 to S402, which is described in detail as follows:
in S401, if the detection result is that the detection is not passed, determining a signal-to-noise ratio of the satellite signal corresponding to the time service data packet received.
In this embodiment, when the satellite timing system detects that the detection result is that the detection is failed, it indicates that the timing data packet is invalid, that is, the timing data packet is not complete and/or correct, that is, the initial timing information included in the timing data packet is interfered, so the satellite timing system may determine the signal-to-noise ratio of the satellite signal corresponding to the time when the timing data packet is received, and compare the signal-to-noise ratio with the set threshold. The set threshold may be determined according to actual needs, and is not limited herein.
In S402, if the signal-to-noise ratio is smaller than a set threshold, it is determined that the initial timing information is interfered.
In this embodiment, when the satellite timing system detects that the signal-to-noise ratio is smaller than the set threshold, it indicates that the quality of the satellite signal is poor, so the satellite timing system can determine that the initial timing information is interfered.
As can be seen from the above, in the satellite time service method provided in this embodiment, when it is determined that the detection result is that the detection fails, the signal-to-noise ratio of the satellite signal corresponding to the time service data packet received can be determined; and when the signal-to-noise ratio is detected to be smaller than the set threshold, the interference of the initial time service information can be determined, and the detection accuracy of whether the initial time service information is interfered is improved.
Referring to fig. 7, fig. 7 is a schematic diagram of a satellite timing method according to another embodiment of the present application. In contrast to the embodiment corresponding to fig. 4, after step S202, the present embodiment may further detect whether the initial timing information is interfered through steps S501 to S502, which is described in detail as follows:
in S501, if the detection result is that the detection is not passed, spectrum information of the satellite signal corresponding to the time service data packet is determined.
In this embodiment, when the satellite timing system detects that the detection result is that the detection fails, it indicates that the timing data packet is invalid, that is, the timing data packet is not complete and/or correct, that is, the initial timing information included in the timing data packet is interfered, so the satellite timing system may determine the spectrum information of the satellite signal corresponding to the time when the timing data packet is received, and detect whether the spectrum information meets the set interference judgment condition. The set interference judgment conditions may be set according to actual needs, and are not limited herein.
Illustratively, in some possible embodiments, the set interference determination condition may be: abnormal peaks exist in the spectrum information of the satellite signal.
In this embodiment, when detecting that there is an abnormal peak in the spectrum information of the satellite signal, the satellite time service system indicates that the spectrum information meets the set interference determination condition.
In other possible embodiments, the set interference determination condition may be: there is a sudden change in the spectral information of the satellite signal.
In this embodiment, when the satellite timing system detects that there is a mutation in the spectrum information of the satellite signal, it indicates that the spectrum information meets the set interference determination condition.
In S502, if the spectrum information meets the set interference determination condition, it is determined that the initial time service information is interfered.
In this embodiment, when the satellite timing system detects that the spectrum information meets the set interference judgment condition, it indicates that an interference source exists in the satellite signal, so that the satellite timing system can determine that the initial timing information is interfered.
As can be seen from the above, in the satellite time service method provided in this embodiment, when it is determined that the detection result is that the detection fails, spectrum information of a satellite signal corresponding to the time service data packet is determined; and when the frequency spectrum information is detected to be in accordance with the set interference judgment condition, the interference of the initial time service information can be determined, and the detection accuracy of whether the initial time service information is interfered is improved.
In one embodiment of the present application, since the time-service precision of the time-service device according to the target time-service information determined according to the pre-stored ephemeris data is lower than the time-service precision of the time-service device according to the initial time-service information which is not interfered and sent by the satellite system directly, the satellite time-service system may further execute the following steps after executing step S104, which is described in detail below:
acquiring current time service information sent by the satellite system;
if the second interference level corresponding to the current time service information is smaller than or equal to the set level, determining the current time service information as the latest time service information of the to-be-time service equipment; the second interference level is used for representing the interference degree suffered by the current time service information.
In this embodiment, after the satellite time service system performs time service on the device to be time-serviced according to the target time service information, the current time service information sent by the satellite system may be received in real time, and whether the current time service information is interfered is detected, so as to determine the second interference level of the current time service information. The current time service information refers to time service information of the satellite time service system at a time point after time service is performed on the time service equipment according to the target time service information.
When the satellite time service system detects that the second interference level is smaller than or equal to the set level, the satellite time service system indicates that the interference degree received by the current time service information is small and can be ignored, so that the satellite time service system can determine the current time service information as the latest time service information of the equipment to be time service, and the time service precision of the equipment to be time service is improved.
Based on this, in still another embodiment of the present application, the satellite time service system may acquire and store the current ephemeris data of the satellite system in real time while performing time service on the time service device again according to the current time service information, so as to improve the accuracy of calculating the latest position information of each position by using the ephemeris data in the following process.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Corresponding to the satellite time service method described in the above embodiments, fig. 8 is a schematic structural diagram of a satellite time service device provided in the embodiment of the present application, and for convenience of explanation, only the portions relevant to the embodiments of the present application are shown. Referring to fig. 8, the satellite time service apparatus 600 includes: a first determination unit 61, a first acquisition unit 62, a first calculation unit 63, and a second determination unit 64. Wherein:
The first determining unit 61 is configured to determine a first interference level when it is detected that initial timing information from the satellite system is interfered; the first interference level is used for representing the interference degree suffered by the initial time service information.
The first obtaining unit 62 is configured to obtain pre-stored ephemeris data of the satellite system if the first interference level is greater than a set level.
The first calculating unit 63 is configured to calculate, according to the ephemeris data, current position information of each satellite in the satellite system.
The second determining unit 64 is configured to determine target time service information of the to-be-time service device according to current location information of each satellite.
In one embodiment of the present application, the satellite timing device 600 further includes: the device comprises a receiving unit, a first detecting unit and a second detecting unit. Wherein:
the receiving unit is used for receiving a time service data packet sent by the satellite system, and the time service data packet comprises the initial time service information.
The first detection unit is used for detecting the validity of the time service data packet to obtain a detection result.
And the second detection unit is used for determining the first time when the time service data packet is received if the detection result is that the detection is not passed, and detecting whether the initial time service information is interfered or not according to the first time.
In one embodiment of the present application, the time service data packet includes a plurality of sub-data packets, and the first time includes an actual receiving time corresponding to each sub-data packet; the second detection unit specifically includes: and a third determination unit.
And the third determining unit is used for determining that the initial time service information is interfered if the actual receiving time corresponding to any one of the plurality of sub-data packets exists and the difference value between the pre-stored expected receiving time corresponding to any one of the sub-data packets is larger than the set difference value.
In one embodiment of the present application, the second detection unit specifically includes: a second calculation unit and a fourth determination unit. Wherein:
the second calculating unit is used for traversing and calculating the time interval between the actual receiving times corresponding to every two adjacent sub-data packets.
And the fourth determining unit is used for determining that the initial time service information is interfered if at least one time interval longer than the set time length exists in each time interval.
In one embodiment of the present application, the satellite timing device 600 further includes: a fifth determination unit and a sixth determination unit. Wherein:
and the fifth determining unit is used for determining the signal-to-noise ratio of the corresponding satellite signal when the time service data packet is received if the detection result is that the detection is not passed.
And the sixth determining unit is used for determining that the initial time service information is interfered if the signal-to-noise ratio is smaller than a set threshold value.
In one embodiment of the present application, the satellite timing device 600 further includes: a seventh determination unit and an eighth determination unit. Wherein:
and the seventh determining unit is used for determining the frequency spectrum information of the corresponding satellite signal when the time service data packet is received if the detection result is that the detection is not passed.
And the eighth determining unit is used for determining that the initial time service information is interfered if the frequency spectrum information accords with the set interference judging condition.
In one embodiment of the present application, the satellite timing device 600 further includes: a second acquisition unit and a ninth determination unit. Wherein:
the second acquisition unit is used for acquiring current time service information sent by the satellite system.
The ninth determining unit is configured to determine the current time service information as the latest time service information of the to-be-time service device if the second interference level corresponding to the current time service information is less than or equal to the set level; the second interference level is used for representing the interference degree suffered by the current time service information.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 9 is a schematic structural diagram of a satellite timing system according to an embodiment of the present application. As shown in fig. 9, the satellite timing system 7 of this embodiment includes: at least one processor 70 (only one shown in fig. 9), a memory 71, and a computer program 72 stored in the memory 71 and executable on the at least one processor 70, the processor 70 implementing the steps in any of the various satellite timing method embodiments described above when executing the computer program 72.
The satellite timing system may include, but is not limited to, a processor 70, a memory 71. It will be appreciated by those skilled in the art that fig. 9 is merely an example of the satellite time service system 7 and is not meant to be limiting as the satellite time service system 7, and may include more or fewer components than shown, or may combine certain components, or may include different components, such as input-output devices, network access devices, etc.
The processor 70 may be a central processing unit (Central Processing Unit, CPU) and the processor 70 may be other general purpose processors, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 71 may be an internal storage unit of the satellite timing system 7 in some embodiments, for example, a memory of the satellite timing system 7. The memory 71 may also be an external storage device of the satellite timing system 7 in other embodiments, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the satellite timing system 7. Further, the memory 71 may also include both an internal storage unit and an external storage device of the satellite timing system 7. The memory 71 is used for storing an operating system, application programs, boot loader (BootLoader), data, other programs, etc., such as program codes of the computer program. The memory 71 may also be used for temporarily storing data that has been output or is to be output.
Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements steps that may implement the various method embodiments described above.
Embodiments of the present application provide a computer program product that, when executed on a satellite timing system, enables the satellite timing system to perform the steps of the method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the flow in the methods of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program may implement the steps of each method embodiment described above when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to the satellite timing system, recording medium, computer Memory, read-Only Memory (ROM), random access Memory (RAM, random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. Such as a U-disk, removable hard disk, magnetic or optical disk, etc. In some jurisdictions, computer readable media may not be electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (9)
1. A satellite time service method, comprising:
receiving a time service data packet sent by a satellite system, wherein the time service data packet comprises initial time service information;
detecting the validity of the time service data packet to obtain a detection result;
if the detection result is that the detection is not passed, determining a first time when the time service data packet is received, and detecting whether the initial time service information is interfered or not according to the first time;
Determining a first interference level when it is detected that the initial timing information from the satellite system is interfered; the first interference level is used for representing the interference degree suffered by the initial time service information;
if the first interference level is greater than a set level, acquiring pre-stored ephemeris data of the satellite system;
according to the ephemeris data, calculating to obtain the current position information of each satellite in the satellite system;
and determining target time service information of the equipment to be time service according to the current position information of each satellite.
2. The satellite timing method according to claim 1, wherein the timing data packet includes a plurality of sub-data packets, and the first time includes an actual receiving time corresponding to each of the sub-data packets; the detecting whether the initial time service information is interfered according to the first time includes:
if the actual receiving time corresponding to any one of the plurality of sub-data packets is greater than the preset difference value, determining that the initial time service information is interfered.
3. The satellite timing method according to claim 2, wherein detecting whether the initial timing information is interfered according to the first time, further comprises:
Traversing and calculating the time interval between the actual receiving times corresponding to every two adjacent sub-data packets;
and if at least one time interval longer than the set time length exists in each time interval, determining that the initial time service information is interfered.
4. The satellite timing method according to claim 1, wherein after detecting the validity of the timing data packet, the method further comprises:
if the detection result is that the detection is not passed, determining the signal to noise ratio of the corresponding satellite signal when the time service data packet is received;
and if the signal-to-noise ratio is smaller than a set threshold, determining that the initial time service information is interfered.
5. The satellite timing method according to claim 1, wherein after detecting the validity of the timing data packet, the method further comprises:
if the detection result is that the detection is not passed, determining the frequency spectrum information of the corresponding satellite signal when the time service data packet is received;
and if the frequency spectrum information accords with the set interference judging condition, determining that the initial time service information is interfered.
6. A satellite time service method according to any one of claims 1 to 5, further comprising, after said determining target time service information of the device to be time service according to the current location information of each of said satellites:
Acquiring current time service information sent by the satellite system;
if the second interference level corresponding to the current time service information is smaller than or equal to the set level, determining the current time service information as the latest time service information of the to-be-time service equipment; the second interference level is used for representing the interference degree suffered by the current time service information.
7. A satellite timing device, comprising:
the receiving unit is used for receiving a time service data packet sent by the satellite system, wherein the time service data packet comprises initial time service information;
the first detection unit is used for detecting the validity of the time service data packet to obtain a detection result;
the second detection unit is used for determining the first time for receiving the time service data packet if the detection result is that the detection is not passed, and detecting whether the initial time service information is interfered or not according to the first time;
a first determining unit, configured to determine a first interference level when it is detected that the initial timing information from the satellite system is interfered; the first interference level is used for representing the interference degree suffered by the initial time service information;
the first acquisition unit is used for acquiring the pre-stored ephemeris data of the satellite system if the first interference level is greater than a set level;
The first calculation unit is used for calculating current position information of each satellite in the satellite system according to the ephemeris data;
and the second determining unit is used for determining target time service information of the equipment to be time service according to the current position information of each satellite.
8. A satellite time service system comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the satellite time service method of any one of claims 1 to 6 when the computer program is executed by the processor.
9. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the satellite timing method according to any one of claims 1 to 6.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158774A (en) * | 2015-07-20 | 2015-12-16 | 国家电网公司 | Satellite navigation time service receiver anti-spoofing method |
| CN106093978A (en) * | 2016-06-30 | 2016-11-09 | 郑州威科姆科技股份有限公司 | A kind of anti-spoofing formula interference signal processing method of GNSS time service type DVB |
| CN109738912A (en) * | 2018-11-27 | 2019-05-10 | 中国科学院光电研究院 | A method of fixed point time service is realized based on GNSS satellite signal |
| CN111158024A (en) * | 2019-12-31 | 2020-05-15 | 中国南方电网有限责任公司超高压输电公司 | Anti-cheating method and device for time service terminal |
| CN111970041A (en) * | 2020-07-03 | 2020-11-20 | 南京天际砺剑科技有限公司 | Beidou high-precision communication system based time synchronization technology research method |
| CN113489558A (en) * | 2021-07-01 | 2021-10-08 | 中国科学院国家授时中心 | Interference detection analysis method, system, equipment and medium for low-frequency time code timing signal |
| CN113520435A (en) * | 2021-06-24 | 2021-10-22 | 上海联影微电子科技有限公司 | Time correction method, time correction device, computer equipment and storage medium |
| CN114624736A (en) * | 2022-03-18 | 2022-06-14 | 重庆市计量质量检测研究院 | Anti-interference method of Beidou time synchronization receiver |
| CN115276764A (en) * | 2022-07-06 | 2022-11-01 | 四川创智联恒科技有限公司 | Comprehensive simulation system, method and storage medium for low earth orbit satellite access network system |
| CN115480475A (en) * | 2022-09-02 | 2022-12-16 | 北京无线电计量测试研究所 | Time service interference detection method |
| CN115932897A (en) * | 2022-12-16 | 2023-04-07 | 北京无线电计量测试研究所 | Satellite time service deception jamming method and device, electronic equipment and storage medium |
| CN116243591A (en) * | 2023-01-28 | 2023-06-09 | 北京航空航天大学 | Subnanosecond time service method integrating UTC (k) and Beidou broadcast ephemeris |
| CN116256776A (en) * | 2023-03-08 | 2023-06-13 | 上海空御科技发展有限公司 | Anti-decoy navigation satellite time service system and time service method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9709680B2 (en) * | 2012-09-08 | 2017-07-18 | Schweitzer Engineering Laboratories, Inc. | Quality of precision time sources |
-
2023
- 2023-08-17 CN CN202311045923.4A patent/CN117215172B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158774A (en) * | 2015-07-20 | 2015-12-16 | 国家电网公司 | Satellite navigation time service receiver anti-spoofing method |
| CN106093978A (en) * | 2016-06-30 | 2016-11-09 | 郑州威科姆科技股份有限公司 | A kind of anti-spoofing formula interference signal processing method of GNSS time service type DVB |
| CN109738912A (en) * | 2018-11-27 | 2019-05-10 | 中国科学院光电研究院 | A method of fixed point time service is realized based on GNSS satellite signal |
| CN111158024A (en) * | 2019-12-31 | 2020-05-15 | 中国南方电网有限责任公司超高压输电公司 | Anti-cheating method and device for time service terminal |
| CN111970041A (en) * | 2020-07-03 | 2020-11-20 | 南京天际砺剑科技有限公司 | Beidou high-precision communication system based time synchronization technology research method |
| CN113520435A (en) * | 2021-06-24 | 2021-10-22 | 上海联影微电子科技有限公司 | Time correction method, time correction device, computer equipment and storage medium |
| CN113489558A (en) * | 2021-07-01 | 2021-10-08 | 中国科学院国家授时中心 | Interference detection analysis method, system, equipment and medium for low-frequency time code timing signal |
| CN114624736A (en) * | 2022-03-18 | 2022-06-14 | 重庆市计量质量检测研究院 | Anti-interference method of Beidou time synchronization receiver |
| CN115276764A (en) * | 2022-07-06 | 2022-11-01 | 四川创智联恒科技有限公司 | Comprehensive simulation system, method and storage medium for low earth orbit satellite access network system |
| CN115480475A (en) * | 2022-09-02 | 2022-12-16 | 北京无线电计量测试研究所 | Time service interference detection method |
| CN115932897A (en) * | 2022-12-16 | 2023-04-07 | 北京无线电计量测试研究所 | Satellite time service deception jamming method and device, electronic equipment and storage medium |
| CN116243591A (en) * | 2023-01-28 | 2023-06-09 | 北京航空航天大学 | Subnanosecond time service method integrating UTC (k) and Beidou broadcast ephemeris |
| CN116256776A (en) * | 2023-03-08 | 2023-06-13 | 上海空御科技发展有限公司 | Anti-decoy navigation satellite time service system and time service method |
Non-Patent Citations (1)
| Title |
|---|
| 卫星星历数据产生方法研究;朱锐，刘武兵，代军;卫星与网络;20070215;第37-40页 * |
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