CN117097426A - Time synchronization method, device and system and computer storage medium - Google Patents
Time synchronization method, device and system and computer storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
Abstract
The application discloses a time synchronization method, a device, a system and a computer storage medium, comprising the following steps: the time of controlling the data link load by the data link load arranged on the navigation satellite is synchronous with the time of the navigation satellite; and the data link load sends current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information. In this way, the time reference of the data link load arranged on the navigation satellite is synchronized with the time reference of the navigation satellite, the data link load is synchronized with the time of the data link terminal, and finally the time service is performed on the user receiver, so that the uncertainty of the compression time is realized, and the time of direct capture/re-capture of the long code is shortened.
Description
Technical Field
The present application relates to the field of navigation satellite technologies, and in particular, to a time synchronization method, apparatus, system, and computer storage medium.
Background
Satellite navigation systems have been widely used as an important tool indispensable for people's work and life. However, satellite navigation systems are susceptible to interference and signal reception performance gradually deteriorates with increasing countermeasure strength, and a strong interference environment makes it difficult for the civil code to be captured, in which case it is difficult for the civil code to support long code capture for a long period. However, how to shorten the long code acquisition time has been under study.
Disclosure of Invention
The application aims to provide a time synchronization method, a device, a system and a computer storage medium, which can compress time uncertainty and shorten the time of direct capture/reacquisition of long codes.
To achieve the above object:
in a first aspect, an embodiment of the present application provides a time synchronization method applied to a data link load set in a navigation satellite, the method including the steps of:
controlling the time of the data link load to be synchronous with the time of the navigation satellite;
and sending the current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information.
Optionally, the sending current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information includes:
receiving a timing request sent by the data link terminal;
and responding to the timing request, and transmitting current time information to the data link terminal based on a preset timing algorithm so as to enable the data link terminal to realize time synchronization with the data link load according to the current time information.
Optionally, the data link load includes a baseband signal processing unit, a radio frequency transmitting channel unit, a first power amplifying unit and a first transceiver antenna, and the sending current time information to the data link terminal includes:
and transmitting the current time information acquired and processed by the baseband signal processing unit to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit in sequence, and transmitting the current time information to a data link terminal through the first receiving and transmitting antenna.
Optionally, the data link load further includes a first low noise amplifying unit and a radio frequency receiving channel unit, and the receiving the timing request sent by the data link terminal includes:
and receiving a timing request sent by the data link terminal through the first receiving and transmitting antenna, and transmitting the timing request to the baseband signal processing unit through the first low-noise amplifying unit and the radio frequency receiving channel unit in sequence.
In a second aspect, an embodiment of the present application provides a time synchronization method, applied to a data link terminal, where the method includes the following steps:
receiving current time information sent by a data link load arranged on a navigation satellite;
Performing time synchronization processing based on the current time information to achieve time synchronization with the data link load;
and sending the time information after the synchronization of the data link terminal to a user receiver so as to time the user receiver.
Optionally, before receiving the current time information sent by the data link load of the navigation satellite, the method further includes:
and sending a timing request to the data link load.
Optionally, the data link terminal includes a digital signal processing unit, a receiving channel unit, a second low noise amplifying unit and a second transceiver antenna, where the receiving unit receives current time information sent by a data link load set in a navigation satellite, and includes:
receiving current time information sent by a data link load arranged on a navigation satellite through the second receiving and transmitting antenna;
the performing time synchronization processing based on the current time information to achieve time synchronization with the data link load includes:
and transmitting the current time information to a digital signal processing unit through the second low-noise amplifying unit and the receiving channel unit in sequence, and executing time synchronization processing based on the current time information through the digital signal processing unit.
Optionally, the data link terminal further includes a transmit channel unit and a second power amplifying unit, and the sending a timing request to the data link payload includes:
and transmitting the timing request generated by the digital signal processing unit according to a preset rule to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmitting the timing request to the data link load through the second receiving and transmitting antenna.
In a third aspect, embodiments of the present application provide a time synchronization system comprising at least one navigation satellite configured with a data link payload, at least one data link terminal, and at least one user receiver; the data link load is in communication connection with the data link terminal, and the data link terminal is in communication connection with the user receiver; wherein,
the data link load is used for controlling the time synchronization of the data link load and the time synchronization of the navigation satellite; and sending current time information to the data link terminal;
the data link terminal is used for receiving the current time information sent by the data link load; performing time synchronization processing based on the current time information to achieve time synchronization with the data link load; and sending the time information after the synchronization of the data link terminal to the user receiver so as to time the user receiver.
In a fourth aspect, an embodiment of the present application provides a time synchronization apparatus for performing the above method, including: a processor and a memory storing a computer program, which when run by the processor, implements the steps of the above-described time synchronization method.
In a fifth aspect, an embodiment of the present application provides a computer storage medium having stored therein a computer program which, when executed by a processor, implements the steps of the above-described time synchronization method.
The embodiment of the application provides a time synchronization method, a device, a system and a computer storage medium, wherein the method comprises the following steps: the time of controlling the data link load by the data link load arranged on the navigation satellite is synchronous with the time of the navigation satellite; and the data link load sends current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information. In this way, the time reference of the data link load arranged on the navigation satellite is synchronized with the time reference of the navigation satellite, the data link load is synchronized with the time of the data link terminal, and finally the time service is performed on the user receiver, so that the uncertainty of the compression time is realized, and the time of direct capture/re-capture of the long code is shortened.
Drawings
Fig. 1 is a schematic diagram of a time synchronization system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a data link load structure in accordance with an embodiment of the present application;
fig. 3 is a schematic diagram of a data link terminal according to an embodiment of the present application;
fig. 4 is a flowchart of a time synchronization method according to an embodiment of the present application;
fig. 5 is a second flowchart of a time synchronization method according to an embodiment of the present application;
fig. 6 is a schematic diagram of a time synchronization system according to a second embodiment of the present application;
FIG. 7 is a second schematic diagram of the structure of the data link load in an embodiment of the present application;
fig. 8 is a schematic diagram of a data link terminal according to a second embodiment of the present application;
fig. 9 is a flowchart of a time synchronization method according to an embodiment of the present application;
FIG. 10 is a schematic diagram of a processing architecture for long code acquisition according to an embodiment of the present application;
FIG. 11 is a schematic diagram of capturing timing according to an embodiment of the present application;
FIG. 12 shows capture sensitivities corresponding to different parameters in an embodiment of the application;
fig. 13 is a schematic structural diagram of a time synchronization device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the application may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It should be noted that, in this document, step numbers such as S101 and S102 are adopted, and the purpose of the present application is to more clearly and briefly describe the corresponding content, and not to constitute a substantial limitation on the sequence, and those skilled in the art may execute S102 before executing S101 in the implementation, which are all within the scope of the present application.
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.
In the following description, suffixes such as "module", "part" or "unit" for representing elements are used only for facilitating the description of the present application, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.
Referring to fig. 1, a time synchronization system is provided according to an embodiment of the present application, where the system includes at least one navigation satellite configured with a data link payload, at least one data link terminal, and at least one user receiver; the data link load is in communication connection with the data link terminal, and the data link terminal is in communication connection with the user receiver; wherein,
the data link load is used for controlling the time synchronization of the data link load and the time synchronization of the navigation satellite; and sending current time information to the data link terminal;
the data link terminal is used for receiving the current time information sent by the data link load; performing time synchronization processing based on the current time information to achieve time synchronization with the data link load; and sending the time information after the synchronization of the data link terminal to the user receiver so as to time the user receiver.
In the above scenario, the navigation satellite may be a navigation satellite contained in a Beidou navigation satellite navigation system, a Galileo system, a GPS system, or a George system. In this embodiment, the navigation satellite is taken as a beidou navigation satellite as an example. Here, the data link load may be synchronized with the time of the navigation satellite by controlling the time of the data link load through an atomic clock in the navigation satellite after power-up or start-up so that the data link load is at the same time as the navigation system. The data link load arranged on the navigation satellite can be obtained by sending current time information to the data link terminal, so that the data link terminal can perform time synchronization according to the current time information after receiving the current time information, and the time synchronization with the data link load is realized. The operation of the data link payload to transmit the current time information to the data link terminal may be actively transmitted or may be transmitted based on a response to a request of the data link terminal.
In an embodiment, referring to fig. 2, the data link load includes a baseband signal processing unit, a radio frequency transmission channel unit, a first power amplifying unit and a first transceiver antenna, and the data link load sends current time information to a data link terminal, including: and transmitting the current time information acquired and processed by the baseband signal processing unit to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit in sequence, and transmitting the current time information to a data link terminal through the first receiving and transmitting antenna. The baseband signal processing unit is in communication connection with the radio frequency transmitting channel unit, the radio frequency transmitting channel unit is in communication connection with the first power amplifying unit, the first power amplifying unit is in communication connection with the first receiving and transmitting antenna so as to form a transmitting channel of a data link signal of a data link load, and after acquiring and processing current time information, the baseband signal processing unit sequentially transmits the current time information to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit, and transmits the current time information to a data link terminal through the first receiving and transmitting antenna. It should be noted that, the output waveform of the baseband signal processing unit may be set, and signal processing such as analog-to-digital conversion may be performed.
In an embodiment, referring to fig. 3, the data link terminal includes a digital signal processing unit, a receiving channel unit, a second low noise amplifying unit, and a second transceiver antenna, and the data link terminal receives current time information sent by a data link load set in a navigation satellite, and includes: receiving current time information sent by a data link load arranged on a navigation satellite through the second receiving and transmitting antenna;
the data link terminal performs time synchronization processing based on the current time information to achieve time synchronization with the data link load, and includes:
and transmitting the current time information to a digital signal processing unit through the second low-noise amplifying unit and the receiving channel unit in sequence, and executing time synchronization processing based on the current time information through the digital signal processing unit.
The digital signal processing unit is in communication connection with the receiving channel unit, the receiving channel unit is in communication connection with the second low noise amplifying unit, the second low noise amplifying unit is in communication connection with the second receiving and transmitting antenna so as to form a receiving channel of a data link signal of the data link terminal, and the second receiving and transmitting antenna sequentially transmits the current time information to the digital signal processing unit through the second low noise amplifying unit and the receiving channel unit after receiving the current time information sent by a data link load arranged on a navigation satellite.
In one embodiment, the data link load is specifically configured to: receiving a timing request sent by the data link terminal; and responding to the timing request, and transmitting current time information to the data link terminal based on a preset timing algorithm so as to enable the data link terminal to realize time synchronization with the data link load according to the current time information. It can be understood that when the data link load receives the timing request sent by the data link terminal, it indicates that the data link terminal wants to perform timing operation, and the data link load sends current time information to the data link terminal based on a preset timing algorithm, so that the data link terminal realizes time synchronization with the data link load according to the current time information. It should be noted that the preset timing algorithm may be an existing timing algorithm, which is not specifically limited herein. The data link load can send the current time information to the data link terminal in a preset format so as to facilitate data transmission.
In an embodiment, with continued reference to fig. 2, the data link payload further includes a first low noise amplifying unit and a radio frequency receiving channel unit, and the data link payload receives a timing request sent by the data link terminal, including: and receiving a timing request sent by the data link terminal through the first receiving and transmitting antenna, and transmitting the timing request to the baseband signal processing unit through the first low-noise amplifying unit and the radio frequency receiving channel unit in sequence. The base band signal processing unit is in communication connection with the radio frequency receiving channel unit, the radio frequency receiving channel unit is in communication connection with the first low noise amplifying unit, the first low noise amplifying unit is in communication connection with the first receiving and transmitting antenna so as to form a receiving channel of a data link signal of a data link load, and the first receiving and transmitting antenna transmits a timing request to the base band signal processing unit through the first low noise amplifying unit and the radio frequency receiving channel unit after the timing request is sent by the data link terminal. The data link load further comprises a first power supply unit for providing the data link load with the voltage and/or current required for operation.
In an embodiment, with continued reference to fig. 3, the data link terminal further includes a transmit channel unit and a second power amplification unit, and the data link terminal sends a timing request to the data link payload, including: and transmitting the timing request generated by the digital signal processing unit according to a preset rule to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmitting the timing request to the data link load through the second receiving and transmitting antenna. The digital signal processing unit is in communication connection with the transmitting channel unit, the transmitting channel unit is in communication connection with the second power amplifying unit, the second power amplifying unit is in communication connection with the second receiving and transmitting antenna so as to form a transmitting channel of a data link signal of the data link terminal, and after generating a timing request according to a preset rule, the digital signal processing unit transmits the timing request to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmits the timing request to the data link load through the second receiving and transmitting antenna. The preset rules can be set according to actual situation requirements, such as coding formats, modulation modes and the like. The data link terminal further comprises a second power supply unit for providing the data link terminal with the voltage and/or current required for operation.
In summary, in the time synchronization system provided in the above embodiment, the time reference of the data link load set in the navigation satellite is synchronized with the time reference of the navigation satellite, the data link load is synchronized with the time of the data link terminal, and finally, the time is given to the user receiver, so as to achieve the uncertainty of the compression time and shorten the time of direct capturing/re-capturing of the long code.
Referring to fig. 4, a time synchronization method provided by an embodiment of the present application may be implemented by a time synchronization apparatus provided by an embodiment of the present application, where the apparatus may be implemented in software and/or hardware, and the time synchronization method provided by the embodiment of the present application may be applied to a data link load set in a navigation satellite in fig. 1, and includes the following steps:
step S101: the time of the control data link load is synchronized with the time of the navigation satellite.
The navigation satellite may be a navigation satellite contained in a Beidou navigation satellite navigation system, a Galileo system, a GPS system or a George system. In this embodiment, the navigation satellite is taken as a beidou navigation satellite as an example. Here, the data link load may be synchronized with the time of the navigation satellite by controlling the time of the data link load through an atomic clock in the navigation satellite after power-up or start-up so that the data link load is at the same time as the navigation system.
Step S102: and sending the current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information.
Here, the data link load set in the navigation satellite may be time-synchronized with the data link load by sending current time information to the data link terminal, so that the data link terminal performs time synchronization according to the current time information after receiving the current time information. The operation of the data link payload to transmit the current time information to the data link terminal may be actively transmitted or may be transmitted based on a response to a request of the data link terminal.
In an embodiment, the sending current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information includes:
receiving a timing request sent by the data link terminal;
and responding to the timing request, and transmitting current time information to the data link terminal based on a preset timing algorithm so as to enable the data link terminal to realize time synchronization with the data link load according to the current time information.
It can be understood that when the data link load receives the timing request sent by the data link terminal, it indicates that the data link terminal wants to perform timing operation, and the data link load sends current time information to the data link terminal based on a preset timing algorithm, so that the data link terminal realizes time synchronization with the data link load according to the current time information. It should be noted that the preset timing algorithm may be an existing timing algorithm, which is not specifically limited herein. The data link load can send the current time information to the data link terminal in a preset format so as to facilitate data transmission.
In summary, in the time synchronization method provided in the foregoing embodiment, the time reference of the data link load set in the navigation satellite is synchronized with the time reference of the navigation satellite, then the data link load is synchronized with the time of the data link terminal, and finally the time is given to the user receiver, so as to achieve the uncertainty of the compression time and shorten the time of direct capturing/re-capturing of the long code.
In an embodiment, the data link load includes a baseband signal processing unit, a radio frequency transmitting channel unit, a first power amplifying unit and a first transceiver antenna, and the sending current time information to the data link terminal includes:
And transmitting the current time information acquired and processed by the baseband signal processing unit to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit in sequence, and transmitting the current time information to a data link terminal through the first receiving and transmitting antenna.
The baseband signal processing unit is in communication connection with the radio frequency transmitting channel unit, the radio frequency transmitting channel unit is in communication connection with the first power amplifying unit, the first power amplifying unit is in communication connection with the first receiving and transmitting antenna so as to form a transmitting channel of a data link signal of a data link load, and after acquiring and processing current time information, the baseband signal processing unit sequentially transmits the current time information to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit, and transmits the current time information to a data link terminal through the first receiving and transmitting antenna. It should be noted that, the output waveform of the baseband signal processing unit may be set, and signal processing such as analog-to-digital conversion may be performed.
In an embodiment, the data link load further includes a first low noise amplifying unit and a radio frequency receiving channel unit, and the receiving the timing request sent by the data link terminal includes:
And receiving a timing request sent by the data link terminal through the first receiving and transmitting antenna, and transmitting the timing request to the baseband signal processing unit through the first low-noise amplifying unit and the radio frequency receiving channel unit in sequence. The base band signal processing unit is in communication connection with the radio frequency receiving channel unit, the radio frequency receiving channel unit is in communication connection with the first low noise amplifying unit, the first low noise amplifying unit is in communication connection with the first receiving and transmitting antenna so as to form a receiving channel of a data link signal of a data link load, and the first receiving and transmitting antenna transmits a timing request to the base band signal processing unit through the first low noise amplifying unit and the radio frequency receiving channel unit after the timing request is sent by the data link terminal.
Referring to fig. 5, a time synchronization method provided by an embodiment of the present application may be implemented by a time synchronization apparatus provided by an embodiment of the present application, where the apparatus may be implemented in software and/or hardware, and the time synchronization method provided by the embodiment of the present application may be applied to a data link terminal in fig. 1, and includes the following steps:
Step S201: and receiving current time information sent by a data link load arranged on the navigation satellite, wherein the time of the data link load is synchronous with the time of the navigation satellite.
Here, the data link terminal may passively receive the current time information transmitted by the data link payload provided in the navigation satellite, or may actively receive the current time information transmitted by the data link payload based on a request initiated by the data link terminal itself.
In an embodiment, before receiving the current time information sent by the data link payload of the navigation satellite, the method further includes: and sending a timing request to the data link load. Here, the data link terminal may send a timing request to the data link payload at a fixed or non-fixed time to request the data link payload to perform a timing operation on the data link terminal, that is, to request to implement time synchronization with the data link payload.
Step S202: and executing time synchronization processing based on the current time information so as to realize time synchronization with the data link load.
Specifically, after receiving the current time information sent by the data link load, the data link terminal executes time synchronization processing based on the current time information so as to realize time synchronization with the data link load. Here, the specific operation procedure of the data link terminal for performing the time synchronization process may refer to the prior art, and will not be described herein.
Step S203: and sending the time information after the synchronization of the data link terminal to a user receiver so as to time the user receiver.
Specifically, after performing time synchronization processing based on the current time information to achieve time synchronization with the data link load, the data link terminal may send the time information after synchronization to a user receiver to perform time service on the user receiver, thereby achieving compression time uncertainty.
In an embodiment, the data link terminal includes a digital signal processing unit, a receiving channel unit, a second low noise amplifying unit and a second transceiver antenna, where the receiving the current time information sent by the data link load set in the navigation satellite includes:
receiving current time information sent by a data link load arranged on a navigation satellite through the second receiving and transmitting antenna;
the performing time synchronization processing based on the current time information to achieve time synchronization with the data link load includes:
and transmitting the current time information to a digital signal processing unit through the second low-noise amplifying unit and the receiving channel unit in sequence, and executing time synchronization processing based on the current time information through the digital signal processing unit.
The digital signal processing unit is in communication connection with the receiving channel unit, the receiving channel unit is in communication connection with the second low noise amplifying unit, the second low noise amplifying unit is in communication connection with the second receiving and transmitting antenna so as to form a receiving channel of a data link signal of the data link terminal, and the second receiving and transmitting antenna sequentially transmits the current time information to the digital signal processing unit through the second low noise amplifying unit and the receiving channel unit after receiving the current time information sent by a data link load arranged on a navigation satellite.
In an embodiment, the data link terminal further includes a transmit channel unit and a second power amplifying unit, and the sending the timing request to the data link payload includes: and transmitting the timing request generated by the digital signal processing unit according to a preset rule to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmitting the timing request to the data link load through the second receiving and transmitting antenna. The digital signal processing unit is in communication connection with the transmitting channel unit, the transmitting channel unit is in communication connection with the second power amplifying unit, the second power amplifying unit is in communication connection with the second receiving and transmitting antenna so as to form a transmitting channel of a data link signal of the data link terminal, and after generating a timing request according to a preset rule, the digital signal processing unit transmits the timing request to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmits the timing request to the data link load through the second receiving and transmitting antenna. The preset rules can be set according to actual situation requirements, such as coding formats, modulation modes and the like.
In summary, in the time synchronization method provided in the foregoing embodiment, the time reference of the data link load set in the navigation satellite is synchronized with the time reference of the navigation satellite, then the data link load is synchronized with the time of the data link terminal, and finally the time is given to the user receiver, so as to achieve the uncertainty of the compression time and shorten the time of direct capturing/re-capturing of the long code.
Based on the same inventive concept as the foregoing embodiments, the foregoing embodiments are described in detail below by way of a specific example, which takes the Beidou navigation satellite as an example.
The existing Assisted-GNSS technology in the civil field can shorten the first positioning time of the navigation receiver and improve the positioning efficiency, and is widely applied to various intelligent terminals. However, for open sea ocean areas, in addition to complex and changeable electromagnetic environments of battlefield, the Assisted-GNSS technology in the civil field is insufficient to support the quick capture of Beidou long codes under the interference environment, and the wireless network of ground Assisted positioning has poor survivability and cannot be used for greatly shortening the first positioning time of long codes with long period.
In view of the foregoing problems, referring to fig. 6, a schematic structural diagram of a time synchronization system according to the present embodiment includes: the system comprises a Beidou satellite, a military Beidou receiver and a data link terminal, wherein the military Beidou receiver is arranged on a user; the Beidou satellite is internally provided with a data link load, and the data link load is consistent with a navigation time reference. Fig. 7 is a schematic structural diagram of a satellite data link load, and satellite-to-ground time synchronization is completed by using a bidirectional time synchronization function between the data link load and a data link terminal at a user side. The data link load comprises a power supply unit, a baseband signal processing unit, a radio frequency transmitting channel unit, a power amplifying unit, a low noise amplifying unit, a radio frequency receiving channel unit and a receiving and transmitting antenna; the power supply unit comprises an on-off control module, a short-circuit protection module, a surge suppression module, a DC/DC conversion module and the like; the signal generated by the baseband signal processing unit is transmitted to the data link terminal at the user side through the radio frequency transmitting channel unit, the power amplifying unit and the receiving and transmitting antenna in sequence. The receiving and transmitting antenna receives the data link signal of the data link terminal at the user side, and the received signal sequentially passes through the low noise amplifying unit and the radio frequency receiving channel unit and then enters the baseband signal processing unit to carry out analog-digital conversion and digital signal processing. The switching of the data link load signal on the satellite side is realized by a circulator or a switch.
Fig. 8 is a schematic structural diagram of a data link terminal, which includes a digital signal processing module, a receiving channel, a low noise amplifying module, a transceiver antenna, a transmitting channel and a power amplifying module. The signal generated by the data link signal processing module is sequentially transmitted to the Beidou satellite data link load through the radio frequency transmitting channel, the power amplifying module and the receiving and transmitting antenna; the receiving and transmitting antenna receives signals transmitted by the data link load of the Beidou satellite side, and the received signals sequentially pass through the low-noise amplifying module and the radio frequency receiving channel module and then enter the data link signal processing module to carry out analog-to-digital conversion and digital signal processing. The data link terminal on the user side is switched with respect to the transceiving of the data link signal by a circulator or a switch.
Based on the same inventive concept as the previous embodiment, referring to fig. 9, a specific flow chart of the time synchronization method provided in this embodiment includes the following steps:
step S301: the data link load control data link load time is synchronous with the Beidou satellite time reference.
Here, the data link load is configured in the beidou satellite, and the data link load is hard-synchronized with the beidou satellite second pulse, so that the satellite data link system and the navigation system adopt the same time. In addition, the design needs to consider that the frequency of the uplink and downlink signals of the data link cannot influence the navigation signal.
Step S302: the data link termination is time synchronized with the data link load in the planet.
The data link terminal initiates a timing request to the data link load at the satellite side, and the timing request information is encoded and modulated according to a specified format and then transmitted to the data link load at the satellite side. And the data chain load at the satellite side returns time information to the ground terminal according to a preset timing algorithm, so that the time synchronization of the data chain system is completed.
Step S303: the data link terminal calculates the time synchronization precision of the data link system.
For satellite-to-ground time synchronization accuracy of the satellite data chain, an RTT-like synchronization algorithm may be used for analysis, which is not described herein.
If the delay error of the hardware channel is not considered, the time service error caused by the position change can be controlled within +/-5 us (microseconds). The error is equivalent to an uncertainty range of about 40 chips for the Beidou signal of 10.23Mcps, greatly compresses the uncertainty of Beidou time, and has extremely high long code capturing auxiliary value. Even if the time precision of the link points of the data links on the satellite is only +/-20 ms, the time uncertainty of +/-1 s of the long code direct capture is compressed for 50 times, and the benefit is remarkable.
Step S304: the data link terminal transmits the data link time to the military Beidou receiver to assist in long code capturing.
Here, the data link terminal transmits the data link time to the military Beidou receiver so as to assist the receiver to finish 10us precision time service, and the capturing only needs to search about 205 code phases to finish the quick capturing of the long code.
The specific process is as follows:
when the long code capturing of the Beidou receiver is carried out by adopting a PMF+DFT (partial matched filter+discrete Fourier transform) processing mode, the PMF processing realizes parallel search of code phases, and the DFT realizes parallel search of frequencies. Referring to fig. 10, a schematic diagram of a processing architecture for long code acquisition is shown, where PMF is implemented in the frequency domain.
The B3Q signal information rate is 500bps, limiting the coherent integration time to 2ms. The acquisition timing based on 2ms coherent integration and post accumulation is shown in fig. 11. Firstly, signal data and local pseudo codes need to be cached, the sampling rate of the signal is 20.46MHz, 2ms data is divided into 20 sub-blocks, each sub-block contains 0.1ms data and pseudo codes, and one DFT operation can finish the pseudo code search of 0.1ms time uncertainty.
Because the coherent integration time is limited, a noncoherent accumulation method is generally adopted, and the capture sensitivity is improved. 0.1ms pre-integral equivalent 10KHz frequency searching range, different frequency searching precision f dop The maximum incoherent integration total time is calculated as follows:
t×f dop ×f code /f r ≤0.5
Wherein f code Is the spread spectrum code rate, f r Is the carrier frequency. Lifting the number of incoherent accumulations will result in an increase in the total search duration, requiring a balance of sensitivity and acquisition speed, given the constraints imposed by the total hardware resources. The method is characterized in that the table 1 is a capture probability simulation table of different sensitivities (namely signal power) and incoherent accumulation times, and the D2 code capture sensitivity of the current Beidou system is generally limited to-143 to-141 dBm.
TABLE 1
The data chain terminal can assist the Beidou receiver to finish 10us precision time service, greatly compress time uncertainty and only need to search about 205 code phases. In view of the fact that the BD provides the B3A pilot channel, sensitivity can be improved in a mode of lengthening coherent integration time, capturing performance of military Beidou signals is greatly improved, and difference between a capturing threshold and a tracking threshold is reduced.
After the time uncertainty is greatly compressed, the dwell search time for each code phase is increased, and a coherent integration time of over 10ms can be used based on the pilot channel of B3A, which indicates that the sensitivity can be increased to-145 dBm, see fig. 12.
In summary, the present embodiment provides a time synchronization method, which has the following innovative points: the Beidou and satellite data link platform is integrally designed, a data link load is configured on a Beidou satellite, a data link waveform is designed to be a high-speed variable-speed frequency hopping system, and the high anti-interference performance of a data link channel is utilized to assist in enhancing the countermeasure capability of a Beidou navigation system; and the load time reference of the data link on the satellite is synchronous with the Beidou time reference, the time service of the Beidou receiver is completed by utilizing the access synchronization of the data link terminal, the uncertainty of the Beidou time is compressed, and the direct capturing/re-capturing time of the Beidou long code is accelerated. Meanwhile, the method has the following advantages: by constructing a fusion system of satellite navigation and satellite data chains, an anti-interference time service channel can be additionally provided for users, and for users who originally need navigation and data chains to exist at the same time, wireless networks required by the existing A-GNSS technology do not need to be rebuilt, beidou long code capture can be assisted through the satellite data chains, and the functions and performances of the Beidou and satellite data chains are not influenced; the satellite data link time is synchronous with the Beidou time, the time service precision of the satellite data link is assumed to be +/-20 ms, and the satellite data link time can be compressed by 50 times relative to the uncertainty of +/-1 s of direct capturing of the Beidou long code, so that the direct capturing time of the long code is greatly shortened; the time service precision is further improved by optimizing a timing algorithm of the satellite-ground data chain, and the method has great significance for compression of Beidou time uncertainty.
Based on the same inventive concept as the previous embodiments, the present embodiment provides a time synchronization apparatus, as shown in fig. 13, including: a processor 310 and a memory 311 in which a computer program is stored; the number of the processors 310 illustrated in fig. 13 is not used to refer to one number of the processors 310, but is merely used to refer to a positional relationship of the processors 310 with respect to other devices, and in practical applications, the number of the processors 310 may be one or more; similarly, the memory 311 illustrated in fig. 13 is also used in the same sense, that is, only to refer to the positional relationship of the memory 311 with respect to other devices, and in practical applications, the number of the memories 311 may be one or more. The time synchronization method applied to the above-described apparatus is implemented when the processor 310 runs the computer program.
The apparatus may further include: at least one network interface 312. The various components in the device are coupled together by a bus system 313. It is appreciated that the bus system 313 is used to enable connected communication between these components. The bus system 313 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration the various buses are labeled as bus system 313 in fig. 13.
The memory 311 may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Wherein the nonvolatile Memory may be Read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 311 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The memory 311 in the embodiment of the present invention is used to store various types of data to support the operation of the apparatus. Examples of such data include: any computer program for operating on the device, such as an operating system and application programs; contact data; telephone book data; a message; a picture; video, etc. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks. The application programs may include various application programs such as a Media Player (Media Player), a Browser (Browser), etc. for implementing various application services. Here, a program for implementing the method of the embodiment of the present invention may be included in an application program.
Based on the same inventive concept as the previous embodiments, the present embodiment further provides a computer storage medium in which a computer program is stored, where the computer storage medium may be a Memory such as a magnetic random access Memory (FRAM, ferromagnetic random access Memory), a Read Only Memory (ROM), a programmable Read Only Memory (PROM, programmable Read-Only Memory), an erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), an electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); but may be a variety of devices including one or any combination of the above-described memories, such as a mobile phone, computer, tablet device, personal digital assistant, or the like. The computer program stored in the computer storage medium, when executed by a processor, implements the time synchronization method applied to the apparatus described above. The specific step flow implemented when the computer program is executed by the processor is described with reference to the embodiment shown in fig. 4, and will not be described herein.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and may include other elements not expressly listed.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (11)
1. A method of time synchronization for a data link load disposed at a navigation satellite, the method comprising:
controlling the time of the data link load to be synchronous with the time of the navigation satellite;
And sending the current time information to a data link terminal so that the data link terminal can realize time synchronization with the data link load according to the current time information.
2. The method of claim 1, wherein the sending current time information to a data link terminal to enable the data link terminal to achieve time synchronization with the data link payload according to the current time information comprises:
receiving a timing request sent by the data link terminal;
and responding to the timing request, and transmitting current time information to the data link terminal based on a preset timing algorithm so as to enable the data link terminal to realize time synchronization with the data link load according to the current time information.
3. The method according to claim 1 or 2, wherein the data link payload comprises a baseband signal processing unit, a radio frequency transmission channel unit, a first power amplifying unit and a first transceiver antenna, and wherein the transmitting the current time information to the data link terminal comprises:
and transmitting the current time information acquired and processed by the baseband signal processing unit to the first receiving and transmitting antenna through the radio frequency transmitting channel unit and the first power amplifying unit in sequence, and transmitting the current time information to a data link terminal through the first receiving and transmitting antenna.
4. The method of claim 3, wherein the data chain payload further comprises a first low noise amplification unit and a radio frequency receiving channel unit, and wherein the receiving the timing request sent by the data chain terminal comprises:
and receiving a timing request sent by the data link terminal through the first receiving and transmitting antenna, and transmitting the timing request to the baseband signal processing unit through the first low-noise amplifying unit and the radio frequency receiving channel unit in sequence.
5. A method of time synchronization, applied to a data link terminal, the method comprising:
receiving current time information sent by a data link load arranged on a navigation satellite, wherein the time of the data link load is synchronous with the time of the navigation satellite;
performing time synchronization processing based on the current time information to achieve time synchronization with the data link load;
and sending the time information after the synchronization of the data link terminal to a user receiver so as to time the user receiver.
6. The method of claim 5, wherein the receiving the current time information transmitted by the data link payload disposed at the navigation satellite further comprises:
And sending a timing request to the data link load.
7. The method according to claim 5 or 6, wherein the data link terminal comprises a digital signal processing unit, a receiving channel unit, a second low noise amplifying unit and a second transceiver antenna, and the receiving the current time information of the data link payload transmission provided to the navigation satellite comprises:
receiving current time information sent by a data link load arranged on a navigation satellite through the second receiving and transmitting antenna;
the performing time synchronization processing based on the current time information to achieve time synchronization with the data link load includes:
and transmitting the current time information to a digital signal processing unit through the second low-noise amplifying unit and the receiving channel unit in sequence, and executing time synchronization processing based on the current time information through the digital signal processing unit.
8. The method of claim 7, wherein the data link terminal further comprises a transmit channel unit and a second power amplification unit, wherein the sending the timing request to the data link payload comprises:
and transmitting the timing request generated by the digital signal processing unit according to a preset rule to the second receiving and transmitting antenna through the transmitting channel unit and the second power amplifying unit in sequence, and transmitting the timing request to the data link load through the second receiving and transmitting antenna.
9. A time synchronization system comprising at least one navigation satellite configured with a data link payload, at least one data link terminal, and at least one user receiver; the data link load is in communication connection with the data link terminal, and the data link terminal is in communication connection with the user receiver; wherein,
the data link load is used for controlling the time synchronization of the data link load and the time synchronization of the navigation satellite; and sending current time information to the data link terminal;
the data link terminal is used for receiving the current time information sent by the data link load; performing time synchronization processing based on the current time information to achieve time synchronization with the data link load; and sending the time information after the synchronization of the data link terminal to the user receiver so as to time the user receiver.
10. A time synchronization device, comprising: a processor and a memory storing a computer program, which, when run by the processor, implements the steps of the time synchronization method of any one of claims 1 to 8.
11. A computer storage medium, characterized in that a computer program is stored, which, when being executed by a processor, implements the steps of the time synchronization method according to any one of claims 1 to 8.
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