CN114637186A - Time difference processing method, equipment and storage medium - Google Patents
Time difference processing method, equipment and storage medium Download PDFInfo
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- CN114637186A CN114637186A CN202011477740.6A CN202011477740A CN114637186A CN 114637186 A CN114637186 A CN 114637186A CN 202011477740 A CN202011477740 A CN 202011477740A CN 114637186 A CN114637186 A CN 114637186A
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Abstract
The invention discloses a time difference processing method, a device and a storage medium, wherein the time difference processing method comprises the following steps: after the common-view master station receives satellite timing signals of at least one GNSS, determining system time information of each GNSS; acquiring time information of a local time source; determining a time difference between the system time of each GNSS and the time of the local time source; providing the time difference information to a co-viewing slave station. The co-vision slave station inquires the synchronous GNSS reference and the output GNSS reference; when the synchronous GNSS reference is inconsistent with the output GNSS reference, the common-view slave station determines the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information; the co-viewing slave station compensates the difference between the references to the output time synchronization signal. By adopting the invention, when different time synchronization equipment receives different satellite system time, the same satellite system time can be output, errors are eliminated, and the precision of the time synchronization equipment is improved.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a time difference processing method, device, and storage medium.
Background
1. Satellite receiver and satellite system time error:
the Satellite receiver may receive timing signals of GNSS (Global NAvigation Satellite System), such as GPS (Global Positioning Satellite), beidou, GLONASS (Global NAvigation Satellite System) and Galileo, and then solve for the time of the Satellite System by the timing signals.
However, the time of each satellite system is not uniform, and there is usually a gap on the order of tens of ns (greater than 20ns), and is not fixed. When different time synchronization devices receive different satellite system times, an absolute error of several tens of ns of the time source is caused, which is intolerable to the accuracy requirement of 30ns of the time synchronization device in the 5G network.
The multimode satellite receiver can selectively receive a satellite system signal as a main use, and other satellite system signals as a standby use.
Fig. 1 is a schematic diagram of GPS co-viewing time transfer principle, and for the satellite co-viewing principle, as shown in fig. 1:
(a) setting A as a common-view master station and B as a common-view slave station, wherein receivers placed at the two stations observe the same GPS satellite at the same time;
(b) measuring the time difference between a receiver of the station A and the GNSS system at the station A, and measuring the time difference between the receiver of the station B and the GNSS system at the station B;
(c) and subtracting the two time difference values to obtain the time difference between the station A and the station B, and finishing time service.
The format of the satellite co-view interaction data generally adopts the CGGTTS standard established by the international metering agency (BIPM), the newer Version of which is CGGTTS-Version 2E, fig. 2 is a schematic diagram of the format of the satellite co-view interaction data, and an example of the data format is shown in fig. 2.
The prior art has the disadvantage that when different time synchronization devices receive different satellite system times, no technical scheme for solving the problem of time difference between satellite systems exists.
Disclosure of Invention
The invention provides a time difference processing method, time difference processing equipment and a storage medium, which are used for solving the problem of time synchronization equipment output errors caused by satellite system time differences.
The invention provides the following technical scheme:
a time difference processing method, comprising:
after the common-view master station receives satellite timing signals of at least one GNSS, determining system time information of each GNSS;
the method comprises the steps that a common-view master station obtains time information of a local time source;
the common-view master station determines the time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
and the co-vision master station provides the time difference information of the time difference to the co-vision slave station.
In the implementation, the common-view master station receives satellite timing signals of at least one GNSS, and a plurality of satellite receivers in the common-view master station receive signals of different satellite systems; alternatively, a satellite receiver in the co-vision main station receives signals of different satellite systems.
In an implementation, the common-view master station provides the time difference information of the time difference to the common-view slave station, and the time difference information is provided to the common-view slave station periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the co-vision master station provides the time difference information of the time difference to the co-vision slave station, and the time difference information is provided through a satellite co-vision message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
A time difference processing method, comprising:
the co-vision slave station receives time difference information of a time difference provided by the co-vision master station, wherein the time difference is a time difference between the system time of each GNSS and the time of a local time source of the co-vision master station;
the co-vision slave station inquires synchronous GNSS reference and output GNSS reference;
when the synchronous GNSS reference is inconsistent with the output GNSS reference, the co-view slave station determines the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information;
the co-viewing slave station compensates the difference between the references to the output time synchronization signal.
In the implementation, the co-vision slave station receives the time difference information of the time difference provided by the co-vision master station, and the co-vision master station provides the time difference information periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the co-vision slave station receives the time difference information of the time difference provided by the co-vision master station, and the co-vision master station provides the time difference information through the satellite co-vision message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
In implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
In an implementation, the method further comprises the following steps:
the co-vision slave station provides the compensated time synchronization signal to the timed device.
A co-vision master station, comprising:
a processor for reading the program in the memory, performing the following processes:
after receiving satellite timing signals of at least one GNSS, determining system time information of each GNSS;
acquiring time information of a local time source;
determining a time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
providing time difference information of the time difference to a co-vision slave station;
a transceiver for receiving and transmitting data under the control of the processor.
In an implementation, satellite timing signals of at least one GNSS are received, and different satellite system signals are received by a plurality of satellite receivers in a common-view main station; alternatively, a satellite receiver in the co-vision main station receives signals of different satellite systems.
In the implementation, the time difference information of the time difference is provided to the co-view slave station periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the time difference information of the time difference is provided to the co-vision slave station through a satellite co-vision message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
A co-vision master station, comprising:
the common-view master station receiving module is used for determining system time information of each GNSS after receiving satellite timing signals of at least one GNSS;
the common-view master station acquisition module is used for acquiring time information of a local time source;
the common-view master station time difference module is used for determining the time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
and the common-view master station sending module is used for providing the time difference information of the time difference to the common-view slave station.
In an implementation, the common-view master station receiving module is further configured to receive signals of different satellite systems by a plurality of satellite receivers in the common-view master station when receiving satellite timing signals of at least one GNSS; alternatively, different satellite system signals are received by one satellite receiver in the common view master station.
In an implementation, the common-view master station sending module is further configured to provide the time difference information of the time difference to the common-view slave station periodically or in a response request manner.
In an implementation, the co-view master station transmitting module is further configured to provide time difference information including one or a combination of the following information:
the observation period time length, the time difference in the observation period, the time difference in the last observation period, the time difference average value after the abnormal point is removed in the observation period, and the time difference average value after the abnormal point is removed in the last observation period.
In implementation, the common-view master station sending module is further configured to provide the time difference information of the time difference to the common-view slave station through a satellite common-view message.
In implementation, the common-view master station sending module is further configured to carry time difference information of the time difference in an SSD column OBP column of the standard satellite common-view packet.
A co-viewing slave station comprising:
a processor for reading the program in the memory, performing the following processes:
receiving time difference information of a time difference provided by the co-vision master station, wherein the time difference is a time difference between system time of each GNSS and time of a local time source of the co-vision master station;
querying the synchronized GNSS reference and the outputted GNSS reference;
when the synchronous GNSS reference is inconsistent with the output GNSS reference, determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information;
compensating the difference between the references into an output time synchronization signal;
a transceiver for receiving and transmitting data under the control of the processor.
In an implementation, the time difference information of the time difference provided by the co-view master station is provided by the co-view master station periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period time length, the time difference in the observation period, the time difference in the last observation period, the time difference average value after the abnormal point is removed in the observation period, and the time difference average value after the abnormal point is removed in the last observation period.
In implementation, the receiving of the time difference information of the time difference provided by the common-view master station is provided by the common-view master station through the satellite common-view message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
In implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
In an implementation, the method further comprises the following steps:
and providing the compensated time synchronization signal to the timed device.
A co-viewing slave station comprising:
the common-view slave station receiving module is used for receiving time difference information of time difference provided by the common-view master station, wherein the time difference is the time difference between the system time of each GNSS and the time of the local time source of the common-view master station;
the common-view slave station query module is used for querying the synchronous GNSS reference and the output GNSS reference;
the co-view slave station reference difference module is used for determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information when the synchronous GNSS reference is inconsistent with the output GNSS reference;
and the common-view slave station compensation module is used for compensating the difference of the references into an output time synchronization signal.
In an implementation, the receiving module of the co-view slave station is further configured to receive time difference information of a time difference provided by the co-view master station periodically or in a response request manner.
In an implementation, the receiving module of the co-viewing slave station is further configured to receive time difference information including one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the common-view slave station receiving module is further configured to receive time difference information of a time difference provided by the common-view master station through the satellite common-view message.
In an implementation, the common-view slave station receiving module is further configured to receive time difference information of the time difference, where the time difference information is carried in an SSD column OBP column of the standard satellite common-view packet.
In implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
In an implementation, the method further comprises the following steps:
and the common-view slave station time service module is used for providing the compensated time synchronization signal to the time service device by the common-view slave station.
A computer-readable storage medium storing a computer program for executing the above time difference processing method.
The invention has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, when the common-view slave station determines the time synchronization signal, the common-view slave station can only rely on the satellite system time acquired by the common-view slave station, but can also obtain the time difference information capable of compensating the time synchronization signal through the common-view master station, so that the problem that the time synchronization equipment can only output the acquired satellite system time and the time synchronization error is caused when different time synchronization equipment receives different satellite system times is solved, the same satellite system time can also be output when different time synchronization equipment receives different satellite system times, the error is eliminated, and the precision of the time synchronization equipment is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of GPS common view time transfer principle in the background art;
FIG. 2 is a diagram illustrating a format of satellite co-view interaction data in the prior art;
fig. 3 is a schematic flow chart illustrating an implementation of a method for processing a time difference on a common view master station side according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating an implementation of a method for processing a time difference at a common slave station side according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a time difference processing system according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a format of a satellite common view packet according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a common view master station according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a structure of a co-viewing slave station in an embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
in the prior art, time synchronization equipment can only output the acquired satellite system time, and when different time synchronization equipment receives different satellite system times, time synchronization errors can be caused, and the errors are in tens of ns magnitude.
Based on this, the technical scheme provided in the embodiment of the invention can solve the problem that the same satellite system time can be output when different time synchronization equipment receives different satellite system times, eliminate errors and improve the precision of the time synchronization equipment.
The following describes embodiments of the present invention with reference to the drawings.
In the description process, the implementation of the common-view master station and the common-view slave station side will be described respectively, and then an example of the implementation of the two will be given to better understand the implementation of the scheme given in the embodiment of the present invention. Such an explanation does not mean that the two must be implemented together or separately, and actually, when the common-view master station and the common-view slave station are implemented separately, they each solve the problem on their own side, and when the two are used in combination, a better technical effect is obtained.
Fig. 3 is a schematic flow chart of an implementation of a time difference processing method on the co-view master station side, as shown in the figure, including:
and step 304, the common-view master station provides the time difference information of the time difference to the common-view slave station.
Fig. 4 is a schematic flow chart of an implementation of a method for processing a time difference on a co-view slave station side, as shown in the figure, the method includes:
The following is an example.
First, a system for performing time difference processing will be described.
Fig. 5 is a schematic structural diagram of a time difference processing system, and as shown in the figure, a system in which at least the technical solution provided in the embodiment of the present invention can be implemented involves two parts, namely a co-view primary station and a co-view secondary station. The common-view master station consists of an antenna feed system, a satellite receiver, a time server and an atomic clock group. The common-view slave station consists of an antenna feeder system, a satellite receiver and a client.
The satellite receiver of the common-view master station can receive signals of different satellite systems by a plurality of satellite receivers, and can also receive signals of different satellite systems by the same satellite receiver but can output different satellite system time. That is, the common-view master station receives satellite timing signals of at least one GNSS, and a plurality of satellite receivers in the common-view master station receive signals of different satellite systems; alternatively, a satellite receiver in the co-vision main station receives signals of different satellite systems.
Then, the client of the common-view slave station simultaneously serves as a time synchronization device and provides a time synchronization signal to the time service device. That is, the co-viewing slave station provides the compensated time synchronization signal to the timed device.
The following describes the procedure:
1. the satellite receiver of the time server receives satellite timing signals (including but not limited to GPS, beidou, Glonass and Galileo) of each Global Navigation Satellite System (GNSS) uninterruptedly, and locks and resolves and acquires time information of each satellite system.
2. The time server acquires time information of a local time source, compares the acquired time information of each satellite system with the time information of the local time source to obtain the time difference between each satellite system time and the local time, and stores the time difference;
3. the time server sends the time difference information to the client through the network in a certain sending period or a response request mode, the time difference information at least comprises the duration of the observation period and the average value of the time difference (after the abnormal point is removed) in the observation period or the previous observation period, and the sending period and the observation period can be configured. Namely:
in an implementation, the common-view master station provides the time difference information of the time difference to the common-view slave station, and the time difference information is provided to the common-view slave station periodically or in a response request mode.
The time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
4. The client inquires the GNSS synchronized with the current satellite receiver and the GNSS reference output by the current satellite receiver, wherein the GNSS synchronized with the current satellite receiver and the GNSS reference output by the current satellite receiver can be configured; that is, in implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
5. If the current synchronous GNSS of the satellite receiver of the client is inconsistent with the output GNSS reference, the difference between the current synchronous GNSS and the output GNSS reference is calculated according to the time difference information acquired by the client, and then the difference is compensated to the time signal output by the client.
Examples
The common-view master station is respectively provided with a GPS and a Beidou satellite receiver. The GPS and the Beidou satellite receiver are locked at a certain frequency interval and calculate satellite time, the satellite time is transmitted to the time server, the time server obtains local time source time when receiving the satellite time, the two times are compared to obtain a time difference value, and the time difference value is stored.
In implementation, the co-vision slave station receives the time difference information of the time difference provided by the co-vision master station, and the co-vision master station provides the time difference information through the satellite co-vision message.
In a specific implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet CGGTTS.
Specifically, assuming that the observation period of the configured satellite is 24 hours, at the end of the observation period, the mean values of the difference values between the GPS and the beidou and the local time source can be obtained through calculation. During the next observation period, assuming that the time server sends a satellite common-view packet to the client at a frequency of 16 minutes, fig. 6 is a schematic diagram of a format of the satellite common-view packet, where the satellite common-view packet carries a difference between a satellite system and a local time in the last observation period, and a duration of the observation period, as shown in the SSD and OBP columns in the figure, as follows:
SSD columns are satellite system differences (unit 0.1ns), OBP columns are observation periods (unit h). The difference value between the GPS and the local time is-10.1 ns, and the difference value between the Beidou system and the local time is 25.0 ns.
Assuming that the main receiving satellite of the client is a Beidou satellite, but the time output reference is GPS system time, and the GPS-Beidou time difference can be calculated to be-35.1 ns from the common-view message. And when the client outputs the time signal, compensating the difference value into the output time.
Based on the same inventive concept, the embodiment of the invention also provides a common-view master station, a common-view slave station and a computer readable storage medium, and as the principle of solving the problems of the devices is similar to the time difference processing method, the implementation of the devices can refer to the implementation of the method, and repeated parts are not described again.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 7 is a schematic structural diagram of a co-view master station, as shown in the figure, the co-view master station includes:
the processor 700, which is used to read the program in the memory 720, executes the following processes:
after receiving satellite timing signals of at least one GNSS, determining system time information of each GNSS;
acquiring time information of a local time source;
determining a time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
providing time difference information of the time difference to a co-vision slave station;
a transceiver 710 for receiving and transmitting data under the control of the processor 700.
In an implementation, satellite timing signals of at least one GNSS are received, and different satellite system signals are received by a plurality of satellite receivers in a common-view main station; alternatively, a satellite receiver in the co-vision main station receives signals of different satellite systems.
In the implementation, the time difference information of the time difference is provided to the co-view slave station periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the time difference information of the time difference is provided to the co-vision slave station through a satellite co-vision message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
Where in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.
The embodiment of the invention also provides a common-view master station, which comprises:
the common-view master station receiving module is used for determining system time information of each GNSS after receiving satellite timing signals of at least one GNSS;
the common-view master station acquisition module is used for acquiring time information of a local time source;
the common-view master station time difference module is used for determining the time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
and the common-view master station sending module is used for providing the time difference information of the time difference to the common-view slave station.
In an implementation, the common-view master station receiving module is further configured to receive signals of different satellite systems by a plurality of satellite receivers in the common-view master station when receiving satellite timing signals of at least one GNSS; alternatively, different satellite system signals are received by one satellite receiver in the common view master station.
In an implementation, the common-view master station sending module is further configured to provide the time difference information of the time difference to the common-view slave station periodically or in a response request manner.
In an implementation, the co-view master station transmitting module is further configured to provide time difference information including one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the common-view master station sending module is further configured to provide the time difference information of the time difference to the common-view slave station through a satellite common-view message.
In implementation, the common-view master station sending module is further configured to carry time difference information of the time difference in an SSD column OBP column of the standard satellite common-view packet.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 8 is a schematic structural diagram of a co-viewing slave station, and as shown in the figure, the co-viewing slave station includes:
the processor 800, which is used to read the program in the memory 820, executes the following processes:
receiving time difference information of a time difference provided by the co-vision master station, wherein the time difference is a time difference between system time of each GNSS and time of a local time source of the co-vision master station;
querying the synchronized GNSS reference and the outputted GNSS reference;
when the synchronous GNSS reference is inconsistent with the output GNSS reference, determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information;
compensating the difference between the references into an output time synchronization signal;
a transceiver 810 for receiving and transmitting data under the control of the processor 800.
In an implementation, the time difference information of the time difference provided by the co-view master station is provided by the co-view master station periodically or in a response request mode.
In an implementation, the time difference information includes one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the receiving of the time difference information of the time difference provided by the common-view master station is provided by the common-view master station through the satellite common-view message.
In implementation, the time difference information of the time difference is carried in an SSD column OBP column of the standard satellite common-view packet.
In implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
In an implementation, the method further comprises the following steps:
and providing the compensated time synchronization signal to the timed device.
Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.
The embodiment of the invention also provides a co-vision slave station, which comprises:
the common-view slave station receiving module is used for receiving time difference information of time difference provided by the common-view master station, wherein the time difference is the time difference between the system time of each GNSS and the time of the local time source of the common-view master station;
the common-view slave station query module is used for querying the synchronous GNSS reference and the output GNSS reference;
the co-view slave station reference difference module is used for determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information when the synchronous GNSS reference is inconsistent with the output GNSS reference;
and the common-view slave station compensation module is used for compensating the difference of the reference into an output time synchronization signal.
In an implementation, the receiving module of the co-view slave station is further configured to receive time difference information of a time difference provided by the co-view master station periodically or in a response request manner.
In an implementation, the receiving module of the co-viewing slave station is further configured to receive time difference information including one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
In implementation, the common-view slave station receiving module is further configured to receive time difference information of a time difference provided by the common-view master station through the satellite common-view message.
In an implementation, the common-view slave station receiving module is further configured to receive time difference information of the time difference, where the time difference information is carried in an SSD column OBP column of the standard satellite common-view packet.
In implementations, the synchronized GNSS reference and/or the output GNSS reference are configurable.
In an implementation, the method further comprises the following steps:
and the common-view slave station time service module is used for providing the compensated time synchronization signal to the time service device by the common-view slave station.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in the practice of the invention.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program for executing the time difference processing method.
Specific implementation can be seen in implementation of the time difference processing method at the co-view master station and/or the co-view slave station side.
In summary, in the technical solution provided in the embodiment of the present invention, the time server observes each satellite system time for a long time, calculates a difference between each satellite system time and the local time, and calculates an average value of differences between each satellite system time and the local time in an observation period. And sends the difference to the client.
The satellite system reference for which the client output signal may be configured may not be consistent with the received satellite system.
And the client compensates the output satellite system time according to the difference sent by the time server according to the satellite system to be tracked and the satellite system time to be output, which are configured by the client.
Therefore, the method and the device can solve the problem of time synchronization equipment output errors caused by satellite system time difference.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (18)
1. A time difference processing method, comprising:
after the common-view master station receives satellite timing signals of at least one Global Navigation Satellite System (GNSS), determining system time information of each GNSS;
the method comprises the steps that a common-view master station obtains time information of a local time source;
the common-view master station determines the time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
and the co-vision master station provides the time difference information of the time difference to the co-vision slave station.
2. The method of claim 1, wherein the co-vision primary station receives satellite timing signals of at least one GNSS from a plurality of satellite receivers in the co-vision primary station; alternatively, a satellite receiver in the co-vision main station receives signals of different satellite systems.
3. The method of claim 1, wherein the time difference information for the time difference provided by the co-viewing master station to the co-viewing slave station is provided to the co-viewing slave station periodically or in response to a request.
4. The method of claim 1, wherein the time difference information comprises one or a combination of the following:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
5. The method of claim 1, wherein the providing of the time difference information for the time difference by the co-vision primary station to the co-vision secondary station is provided via a satellite co-vision message.
6. The method of claim 5, wherein the time difference information of the time difference is carried in an OBP column of an observation period of a SSD column of a standard satellite common view packet CGGTTS.
7. A time difference processing method, comprising:
the co-vision slave station receives time difference information provided by the co-vision master station, wherein the time difference is the time difference between the system time of each GNSS and the time of the local time source of the co-vision master station;
the co-vision slave station inquires the synchronous GNSS reference and the output GNSS reference;
when the synchronous GNSS reference is inconsistent with the output GNSS reference, the co-view slave station determines the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information;
the co-viewing slave station compensates the difference between the references to the output time synchronization signal.
8. The method of claim 7, wherein the time difference information for the co-vision slave station to receive the time difference provided by the co-vision master station is provided by the co-vision master station periodically or in response to a request.
9. The method of claim 7, wherein the time difference information comprises one or a combination of the following information:
the observation period duration, the time difference in the observation period, the time difference in the last observation period, the time difference mean value after the abnormal point is removed in the observation period, and the time difference mean value after the abnormal point is removed in the last observation period.
10. The method of claim 7 wherein the time difference information for the time difference provided by the co-vision primary station is received by the co-vision secondary station via a satellite co-vision message.
11. The method of claim 10, wherein the time difference information of the time difference is carried in an SSD column OBP column of a standard satellite co-view packet CGGTTS.
12. The method as recited in claim 7, wherein the synchronized GNSS reference and/or the output GNSS reference are configurable.
13. The method of claim 7, further comprising:
the co-vision slave station provides the compensated time synchronization signal to the timed device.
14. A co-vision master station, comprising:
a processor for reading the program in the memory, performing the following processes:
after receiving satellite timing signals of at least one GNSS, determining system time information of each GNSS;
acquiring time information of a local time source;
determining a time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
providing time difference information of the time difference to a co-vision slave station;
a transceiver for receiving and transmitting data under the control of the processor.
15. A co-vision master station, comprising:
the common-view master station receiving module is used for determining system time information of each GNSS after receiving satellite timing signals of at least one GNSS;
the common-view master station acquisition module is used for acquiring the time information of the local time source;
the common-view master station time difference module is used for determining the time difference between the system time of each GNSS and the time of the local time source according to the system time information of each GNSS and the time information of the local time source;
and the common-view master station sending module is used for providing the time difference information of the time difference to the common-view slave station.
16. A co-viewing secondary station, comprising:
a processor for reading the program in the memory and executing the following processes:
receiving time difference information of a time difference provided by the common-view master station, wherein the time difference is a time difference between the system time of each GNSS and the time of a local time source of the common-view master station;
querying the synchronized GNSS reference and the outputted GNSS reference;
when the synchronous GNSS reference is inconsistent with the output GNSS reference, determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information;
compensating the difference between the references into an output time synchronization signal;
a transceiver for receiving and transmitting data under the control of the processor.
17. A co-viewing slave station, comprising:
the common-view slave station receiving module is used for receiving time difference information of time difference provided by the common-view master station, wherein the time difference is the time difference between the system time of each GNSS and the time of the local time source of the common-view master station;
the common-view slave station query module is used for querying the synchronous GNSS reference and the output GNSS reference;
the co-view slave station reference difference module is used for determining the difference between the synchronous GNSS reference and the output GNSS reference according to the time difference information when the synchronous GNSS reference is inconsistent with the output GNSS reference;
and the common-view slave station compensation module is used for compensating the difference of the references into an output time synchronization signal.
18. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 13.
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