CN117250849A - Satellite-based time service method, device, electronic equipment and storage medium - Google Patents
Satellite-based time service method, device, electronic equipment and storage medium Download PDFInfo
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/06—Decoding time data; Circuits therefor
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Abstract
The invention discloses a satellite-based time service method, a satellite-based time service device, electronic equipment and a storage medium, wherein the method comprises the following steps: receiving a short message signal of the geosynchronous satellite, wherein the short message signal comprises an uplink time delay of a standard time sent to the geosynchronous satellite by a ground control center; receiving a navigation message of a geosynchronous satellite and acquiring a correction parameter of the coordinated universal time from the navigation message; calculating the downlink time delay from the geosynchronous satellite to the time service equipment based on the uplink time delay; calculating the local time of the time service equipment by adopting standard time, uplink time delay, correction parameters and downlink time delay; the time service is performed by adopting the local time, the time service equipment is not required to be positioned and calculate the downlink time delay, and the calculation resource of the ground control center is not occupied, compared with the time delay calculated after the position of the time service equipment is calculated by at least 4 satellites in the prior art, the time service time is shortened, the influence of the calculated position on the time service precision is reduced, and the time service speed and precision are improved.
Description
Technical Field
The present invention relates to the field of time service technologies, and in particular, to a satellite-based time service method, apparatus, electronic device, and storage medium.
Background
Time synchronization is vital in the fields of network communication, electronic computation and the like, and is mainly performed through satellite time service at present, wherein the satellite time service is performed through satellite transmission or forwarding standard time, and is one of various time service modes.
In satellite timing, timing precision is related to propagation delay of standard time, in the prior art, one mode of satellite timing is a one-way timing mode based on RNSS/GNSS, propagation delay is related to distance from timing equipment to satellites, so the timing equipment needs to obtain self position to accurately calculate the propagation delay, the position of the timing equipment is through satellite positioning, the satellite positioning needs to capture at least 4 satellites by the timing equipment, and the time consumption of the position of the timing equipment is calculated, the other mode is based on RDSS (Radio Determination Satellite Service) two-way timing, a user is required to send a timing application signal to a ground control center, after the control center receives the timing application of the user, the propagation delay of the user is calculated, and the propagation delay is sent to the user, and the mode needs to depend on calculation resources of the ground control center.
Disclosure of Invention
The invention provides a satellite-based time service method, a device, electronic equipment and a storage medium, which are used for solving the problems that the existing satellite time service requires a plurality of satellites to solve the position of the time service equipment and is long in time consumption or depends on the computing resources of a ground control center.
In a first aspect, the present invention provides a satellite-based time service method, applied to a time service device, including:
receiving a short message signal of a geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center;
receiving a navigation message of the geosynchronous satellite and acquiring a correction parameter UTCp of the coordinated universal time from the navigation message;
calculating the downlink delay Tdown of the geosynchronous satellite to time service equipment based on the uplink delay Tup;
calculating the local time T1 of the time service device by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown;
and carrying out time service by adopting the local time T1.
Optionally, before calculating the downlink delay Tdown from the geosynchronous satellite to the time service device based on the uplink delay Tup, the method further includes:
judging whether a local memory of the time service equipment stores downlink time delay Tdown or not;
if yes, reading downlink delay Tdown from a local memory of the time service equipment;
if not, executing the step of calculating the downlink delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink delay Tup.
Optionally, the calculating the downlink delay Tdown from the geosynchronous satellite to the time service device based on the uplink delay Tup includes:
sending a timing application to a ground control center through the geosynchronous satellite, forwarding the timing application to the ground control center after receiving the timing application by the geosynchronous satellite, and calculating the total unidirectional propagation time delay Tc from the ground control center to the time service equipment by the ground control center when receiving the timing application;
receiving the one-way propagation total delay Tc from the geosynchronous satellite;
and calculating the difference value between the one-way propagation total time delay Tc and the uplink time delay Tup to serve as the downlink time delay Tdown.
Optionally, after calculating the difference between the one-way propagation total delay Tc and the uplink delay Tup as the downlink delay Tdown, the method further includes:
and storing the downlink time delay Tdown into a local memory of the time service equipment.
Optionally, after storing the downlink delay Tdown in a local memory of the time service device, the method further includes:
judging whether a preset event is detected or not;
if yes, executing the step of calculating the downlink time delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink time delay Tup.
Optionally, the calculating the downlink delay Tdown from the geosynchronous satellite to the time service device based on the uplink delay Tup includes:
and determining that the downlink time delay Tdown is equal to the uplink time delay Tup.
Optionally, the calculating the local time T1 of the time service device using the standard time T0, the uplink delay Tup, the correction parameter UTCp, and the downlink delay Tdown includes:
acquiring equipment time delay Td;
calculating the difference value between the standard time T0 and the correction parameter UTCp;
and calculating the sum of the difference value, the uplink delay Tup, the downlink delay Tdown and the equipment delay Td to serve as the local time T1 of the time service equipment.
In a second aspect, the present invention provides a satellite-based time service apparatus, applied to a time service device, including:
the satellite short message signal receiving module is used for receiving short message signals of the geosynchronous satellite, wherein the short message signals comprise uplink delay Tup of standard time T0 sent to the geosynchronous satellite by a ground control center;
the coordination universal time correction parameter determining module is used for receiving the navigation message of the geosynchronous satellite and acquiring a coordination universal time correction parameter UTCp from the navigation message;
The downlink delay calculation module is used for calculating the downlink delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink delay Tup;
the local time calculating module is configured to calculate a local time T1 of the time service device by using the standard time T0, the uplink time delay Tup, the correction parameter UTCp, and the downlink time delay Tdown;
and the time service module is used for performing time service by adopting the local time T1.
In a third aspect, the present invention provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the satellite-based time service method of any one of the first aspects of the invention.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer instructions for causing a processor to perform the satellite based time service method of any one of the first aspects of the present invention.
In the satellite-based time service method of the embodiment of the invention, the time service equipment can receive the short message signal of the geosynchronous satellite, the short message signal comprises an uplink time delay Tup of a standard time T0 sent by the ground control center to the geosynchronous satellite, a navigation message of the geosynchronous satellite is received, a correction parameter UTCp of coordinated world time is obtained from the navigation message, the downlink time delay Tdown of the geosynchronous satellite to the time service equipment is calculated based on the uplink time delay Tup, the local time T1 of the time service equipment is calculated by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown, and the time service is carried out by adopting the local time T1.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the positions of a satellite, a ground control center and a time service device in a conventional time service method, and fig. 2 is a flowchart of a satellite-based time service method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of timing via geosynchronous satellite in an embodiment of the present invention;
fig. 4 is a flowchart of a satellite-based time service method according to a second embodiment of the present invention;
fig. 5 is a flowchart of a satellite-based time service method according to a third embodiment of the present invention;
FIG. 6 is a schematic diagram of the propagation time differences between the closest and farthest points of the satellite and the earth in an embodiment of the invention;
Fig. 7 is a schematic structural diagram of a satellite-based time service device according to a fourth embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the prior art, the ground control center and the time service device are usually positioned by a plurality of satellites (satellites 1-4), so as to obtain the accurate positions of the ground control center and the time service device, then the distances between the ground control center and the time service device and the satellites are calculated by the accurate positions of the ground control center and the time service device, the uplink time delay and the downlink time delay of signal propagation are respectively calculated by the distances, and the time service of the time service device is realized by the uplink time delay and the downlink time delay, wherein the time service mode requires the accurate positioning of the ground control center and the time service device by the plurality of satellites (satellites 1-4), the positioning resolving process is long, and the time service precision depends on the positioning precision.
In order to solve the above problems, a detailed description will be given below of a satellite-based time service method according to an embodiment of the present invention with reference to the accompanying drawings.
Example 1
Fig. 2 is a flowchart of a satellite-based time service method according to an embodiment of the present invention, where the method may be performed by a satellite-based time service device, and the satellite-based time service device may be implemented in hardware and/or software, and the satellite-based time service device may be configured in an electronic device. As shown in fig. 2, the satellite-based time service method includes:
s201, receiving a short message signal of the geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center.
The satellites used for time service in this embodiment are geosynchronous satellites, which are stationary relative to earth, and an exemplary geosynchronous satellite may be a geosynchronous satellite (Geosynchronous Orbit, GEO) used as a short message satellite in a beidou three-generation system, where the frequency band of the outbound signal of the geosynchronous satellite is 2491.75MHz, which is different from the frequency band 1575.42MHz of the RNSS/GNSS conventional time service device by 900MHz, and has high anti-interference capability.
The ground control center may be a time service center located on the ground, and the ground control center may inject the standard time T0 into the geosynchronous satellite according to a preset period, and for example, the ground control center may be a national time service center of each country.
The uplink time delay Tup may be a time length required for the ground control center to transmit the standard time T0 to the geosynchronous satellite, as shown in fig. 3, since the satellite is the geosynchronous satellite, the position of the ground control center may be fixed after accurate positioning in advance, so that the distance from the ground control center to the geosynchronous satellite may be determined, the ratio of the distance to the propagation speed of the electromagnetic wave may be calculated, so as to obtain the uplink time delay Tup, and the uplink time delay Tup of different ground control centers may be carried when the ground control center transmits the standard time T0 to the geosynchronous satellite.
When the geosynchronous satellite receives the standard time T0 sent by the ground control center, a short message signal including the standard time T0 and the uplink delay Tup can be generated and sent to a time service device, wherein the time service device can be a device needing external time service on the ground, in one example, the time service device can be various network devices such as a switch of a communication base station, a host machine and other electronic devices, in another example, the time service device can also be various mobile terminals such as a mobile phone and the like, the time service device can capture the short message signal sent by the geosynchronous satellite, and the standard time T0 and the uplink delay Tup can be calculated from the short message signal.
S202, receiving a navigation message of the geosynchronous satellite and acquiring a correction parameter UTCp of the coordinated universal time from the navigation message.
Due to the non-uniformity and long-term chronicity of the rotation of the earth, the accumulated error between the Universal Time (UT) and the atomic time (international atomic time, IAT) is larger and larger, when the difference between the Universal time and the atomic time reaches +/-0.9 s, the international metering office unifies the adjustment of the coordinated Universal time by increasing or decreasing 1 second in the year bottom or the year, the beidou time system starts from 2006-01-01, the correction parameter UTCp of the coordinated Universal time in the beidou system is operated until now for 4 seconds, and the navigation text of the geosynchronous satellite can comprise the correction parameter UTCp, so that the correction parameter UTCp of the coordinated Universal time can be obtained from the navigation text.
And S203, calculating the downlink delay Tdown of the geosynchronous satellite to the time service equipment based on the uplink delay Tup.
In one embodiment, the time service device may send a timing application to the ground control center through the geosynchronous satellite, and the ground control center calculates a total unidirectional propagation delay Tc after receiving the timing application, where the total unidirectional propagation delay Tc is a total delay of signals transmitted to the time service device by the ground control center through the geosynchronous satellite, and calculates a difference between the total unidirectional propagation delay Tc and an uplink delay Tup, where the difference is a downlink delay Tdown from the geosynchronous satellite to the time service device.
In another embodiment, since the ground control center and the time service device are both stationary relative to the geosynchronous satellite, the downlink delay Tdown may be set equal to the uplink delay Tup when the time service accuracy requirement is not high.
S204, calculating the local time T1 of the time service device by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown.
Specifically, after the pre-calibrated device delay Td is obtained, a calculation formula of the local time T1 of the time service device is as follows:
T1＝T0-UTCp+Tup+Tdown+Td
if the current local time of the time service device is the same as the calculated local time T1, the local time of the time service device does not need to be adjusted, and if the current local time of the time service device is different from the calculated local time T1, the local time of the time service device is adjusted to be T1.
S205, performing time service by adopting the local time T1.
The local time T1 is the time after the time-service equipment corrects time through the geosynchronous satellite, the local time T1 is synchronous with the time of the ground control center, and the time-service equipment can time each module of the time-service equipment or time other equipment except the time-service equipment by the local time T1.
In the satellite-based time service method of the embodiment of the invention, the time service equipment can receive the short message signal of the geosynchronous satellite, the short message signal comprises an uplink time delay Tup of a standard time T0 sent by the ground control center to the geosynchronous satellite, a navigation message of the geosynchronous satellite is received, a correction parameter UTCp of coordinated world time is obtained from the navigation message, the downlink time delay Tdown of the geosynchronous satellite to the time service equipment is calculated based on the uplink time delay Tup, the local time T1 of the time service equipment is calculated by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown, and the time service method of the embodiment of the invention can read the uplink time delay Tup of the geosynchronous satellite sent by the standard time T0 from the short message signal of the geosynchronous satellite, and calculate the downlink time delay Tdown of the time service equipment according to the uplink time delay Tup, and does not occupy the time delay Tdown of the time service equipment, and the time delay is calculated by adopting the calculation resources of the ground control center, compared with the time service equipment, and the time delay is reduced by at least 4, and the time service precision is reduced compared with the time service equipment.
Example two
Fig. 4 is a flowchart of a satellite-based time service method according to a second embodiment of the present invention, where the optimization is performed based on the first embodiment of the present invention, as shown in fig. 4, and the satellite-based time service method includes:
s401, receiving a short message signal of the geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center.
As shown in fig. 3, the satellite used for time service in this embodiment is a geosynchronous satellite, and an exemplary geosynchronous satellite may be a geosynchronous satellite used as a short message satellite in a beidou third-generation system, the ground control center may inject a standard time T0 into the geosynchronous satellite according to a preset period and carry an uplink time delay Tup, when the geosynchronous satellite receives the standard time T0 sent by the ground control center, the geosynchronous satellite may generate a short message signal including the standard time T0 and the uplink time delay Tup, and send the short message signal to the time service device, where the time service device may calculate the standard time T0 and the uplink time delay Tup from the short message signal of the geosynchronous satellite.
S402, receiving a navigation message of the geosynchronous satellite and acquiring a correction parameter UTCp of the coordinated universal time from the navigation message.
In this embodiment, the correction parameter UTCp may be included in the navigation message of the geosynchronous satellite, so that the correction parameter UTCp for coordinated universal time may be obtained from the navigation message.
In another embodiment, the time service device may store the correction parameter UTCp in the local memory after obtaining the correction parameter UTCp of the coordinated universal time, without having to re-obtain the correction parameter UTCp from the navigation circuit of the geosynchronous satellite before updating the correction parameter UTCp of the next coordinated universal time.
S403, judging whether the local memory of the time service equipment stores the downlink time delay Tdown.
The downlink delay Tdown is the delay of the signals transmitted from the geosynchronous satellite to the time service device, and because the time service device may be a stationary device, for example, the time service device may be an electronic device such as a host computer or an exchange in a communication base station, and the geosynchronous satellite is stationary relative to the earth, the distance between the time service device and the geosynchronous satellite is unchanged, the downlink delay Tdown may be stored in a local memory after the time service device is first powered on and calibrated, it may be determined whether the local memory of the time service device stores the downlink delay Tdown, if yes, S404 is executed, if not, it is stated that the time service device may clear the stored downlink delay Tdown after long-time running, or is the time service device powered on for the first time, or is the time service device after reset, S405 may be executed.
S404, reading the downlink delay Tdown from a local memory of the time service device.
When the local memory of the time service device stores the downlink delay Tdown, the downlink delay Tdown can be directly read from the local memory, so that the speed of acquiring the downlink delay Tdown is improved, and the time service speed is further improved.
And S405, sending a timing application to the ground control center through the geosynchronous satellite, forwarding the timing application to the ground control center after receiving the timing application, and calculating the total unidirectional propagation time delay Tc from the ground control center to the time service equipment when receiving the timing application by the ground control center.
When the local memory of the time service equipment does not store the downlink delay Tdown, the time service equipment can send a timing application to the ground control center through the geosynchronous satellite, and the ground control center calculates the total unidirectional propagation delay Tc from the ground control center to the time service equipment.
In one embodiment, after receiving the timing application, the ground control center sends a signal to the time service device through the geosynchronous satellite at time t1, and after the time service device receives the signal, the time service device responds to the signal and sends a response signal to the ground control center through the geosynchronous satellite, the ground control center receives the response signal at time t2, the one-way propagation total time delay Tc from the ground control center to the time service device can be calculated through time t1 and time t2, and the one-way propagation total time delay Tc is sent to the time service device through the geosynchronous satellite.
S406, receiving the one-way propagation total delay Tc from the geosynchronous satellite.
After the ground control center transmits the one-way propagation total time delay Tc to the geosynchronous satellite, the geosynchronous satellite forwards the one-way propagation total time delay Tc, and the time service equipment can receive the one-way propagation total time delay Tc from the geosynchronous satellite.
S407, calculating the difference value between the total unidirectional propagation delay Tc and the uplink delay Tup to serve as the downlink delay Tdown.
As shown in fig. 3, the total propagation delay Tc is the total delay of the signal of the ground control center transmitted to the time service device via the geosynchronous satellite, i.e., tc=tup+tdown, and tdown=tc-Tup can be calculated.
And S408, storing the downlink time delay Tdown into a local memory of the time service equipment.
After the time service equipment is powered on for the first time or reset and powered on again, when the downlink time delay Tdown is obtained through calculation, the downlink time delay Tdown is stored in a local memory, and because the distance between the time service equipment and the geosynchronous satellite is relatively fixed, the downlink time delay Tdown is fixed, and the downlink time delay Tdown can be directly read from the local memory in the external time service process of re-powering on after subsequent power off so as to improve the time service speed.
S409, judging whether a preset event is detected.
In this embodiment, the preset event may be a time adjustment operation triggered by a user, for example, after a use position of the time service device is changed, the user triggers the time service device to correct time again, and in an exemplary embodiment, the user dismantles the time service device in the communication base station from the position a and installs the time service device on the communication base station at the position B far from the position a, so that a distance between the time service device and the geosynchronous satellite changes, and the user can trigger the time service device to correct time through operation.
The preset event may be an event that the time service device is powered up again after reset, or reaches a timing time, when the preset event is detected, the method returns to S405 to redetermine the downlink delay Tdown, and if the preset event is not detected, it is determined that the distance between the time service device and the geosynchronous satellite is not changed, or the time service device is not reset. In the embodiment, the downlink delay Tdown is updated through the triggering of the preset event, so that the accuracy of the downlink delay Tdown can be improved, and the time service accuracy is improved.
S410, calculating the local time T1 of the time service device by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown.
Specifically, the device delay Td calibrated in advance may be obtained, where the device delay Td may be the time required for the time service device to parse the time information after receiving the signals of the geosynchronous satellite, and calculate the local time T1 of the time service device according to the following calculation formula:
T1＝T0-UTCp+Tup+Tdown+Td
S411, performing time service by adopting the local time T1.
The local time T1 is the time after the time-service equipment corrects time through the geosynchronous satellite, the local time T1 is synchronous with the time of the ground control center, and the time-service equipment can time each module of the time-service equipment or time other equipment except the time-service equipment by the local time T1.
In the embodiment, after the standard time T0 and the uplink delay Tup are calculated from the short message signal of the geosynchronous satellite, the correction parameter UTCp of the coordinated universal time is obtained, the downlink delay Tdown is directly read when the downlink delay Tdown is stored in the local memory of the time service device, otherwise, the geosynchronous satellite sends a timing application to the ground control center, the geosynchronous satellite forwards the timing application to the ground control center after receiving the timing application, the ground control center calculates the one-way total delay Tc from the ground control center to the time service device when receiving the timing application, and after the one-way total delay Tc is received from the geosynchronous satellite, the difference between the one-way total delay Tc and the uplink delay Tup is calculated as the downlink delay Tdown, and the local time T1 of the time service device is used for calculating the downlink delay by adopting the standard time T0, the uplink delay Tup, the correction parameter UTCp and the downlink delay Tdown, so that the time service device does not need to be positioned and calculated, and the calculation resource of the ground control center is not occupied, compared with the prior art, the time delay is shortened, and the time delay accuracy is reduced after the position is calculated by at least 4 satellites.
Further, when the time service equipment is in a static state, based on the fact that the relative positions of the time service equipment and the geosynchronous satellite are unchanged, after one time of timing application, the time service equipment determines the time down time delay and then stores the time down time delay in a local memory, on one hand, the time service equipment can directly read the time down time delay after long-time running or secondary power-on and external time service, so that the time service speed is improved, on the other hand, after one time of timing application obtains the time down time delay, the time application does not need to obtain the time down time delay again, and the long-term occupation of computing resources of a ground control center is avoided.
Furthermore, when a preset event is detected, the application is re-timed to acquire the downlink delay, so that the problem of low time service precision caused by large stored downlink delay difference after the position of the time service equipment is changed is avoided, and the time service precision is improved.
Example III
Fig. 5 is a flowchart of a satellite-based time service method according to a third embodiment of the present invention, where the optimization is performed based on the first embodiment of the present invention, and as shown in fig. 5, the satellite-based time service method includes:
s501, receiving a short message signal of the geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center.
S502, receiving a navigation message of the geosynchronous satellite and acquiring a correction parameter UTCp of the coordinated universal time from the navigation message.
The present embodiments S501 to S502 can refer to the first embodiment S201 to S202, or the second embodiment S401 to S402, which will not be described in detail herein.
S503, determining that the downlink time delay Tdown is equal to the uplink time delay Tup.
In this embodiment, since the satellites used for time service are geosynchronous satellites, the geosynchronous satellites are stationary relative to the earth, that is, the distance from the geosynchronous satellites to the earth is constant, and the distances from the ground control center and the time service device to the geosynchronous satellites are constant, as shown in fig. 6, the distance from the geosynchronous satellites to the closest point P3 of the earth is the height H of the geosynchronous satellites, the distance from the geosynchronous satellites to the farthest point P1 of the earth is L, the earth radius is R, and the result is obtained according to the pythagorean theorem:
L 2 +R 2 ＝(R+H) 2
the earth radius r=6371 km, the geosynchronous satellite height h= 35786km, the time difference Δt= (L-H)/c≡19.68ms between the nearest point P3 and the farthest point P1 of the geosynchronous satellite signal transmission is calculated by the above formula, generally speaking, the ground control center is not at the equator (nearest point) nor the farthest point, such as the national time service center is in western ampere, and the time service centers of other countries are not at the nearest point or the farthest point, namely, when the downlink time delay Tdown of the geosynchronous satellite to the time service device is set to be equal to the uplink time delay Tup of the ground control center to the geosynchronous satellite, the error of the downlink time delay Tdown is within 10ms, that is, the downlink time delay Tdown is set to be equal to the uplink time delay Tup, which can satisfy the time service scene with low time service precision.
S504, calculating the local time T1 of the time service device by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown.
Specifically, a pre-calibrated device delay Td may be obtained, where the device delay Td may be a time required for the time service device to parse time information after receiving a signal of the geosynchronous satellite, and calculate a local time T1 of the time service device according to the following calculation formula:
T1＝T0-UTCp+Tup+Tdown+Td
since the downstream delay Tdown is equal to the upstream delay Tup, the calculation formula of the local time T1 is as follows:
T1＝T0-UTCp+2×Tup+Td
s505, performing time service by adopting the local time T1.
The local time T1 is the time after the time-service equipment corrects time through the geosynchronous satellite, the local time T1 is synchronous with the time of the ground control center, and the time-service equipment can time each module of the time-service equipment or time other equipment except the time-service equipment by the local time T1.
The time service device of the embodiment can receive a short message signal of the geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center, a navigation message of the geosynchronous satellite is received, a correction parameter UTCp of coordinated universal time is obtained from the navigation message, the downlink time delay Tdown is determined to be equal to the uplink time delay Tup, the local time T1 of the time service device is calculated by the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown and externally time-service, the uplink time delay is directly estimated as the downlink time delay, the time service device is not required to be positioned and calculated, and the calculation resource of the ground control center is not occupied.
Example IV
Fig. 7 is a schematic structural diagram of a satellite-based time service device according to a fourth embodiment of the present invention. As shown in fig. 7, the satellite-based time service apparatus is applied to a time service device, and includes:
the satellite short message signal receiving module 701 is configured to receive a short message signal of a geosynchronous satellite, where the short message signal includes an uplink delay Tup that a ground control center sends a standard time T0 to the geosynchronous satellite;
the coordinated universal time correction parameter determining module 702 is configured to receive a navigation message of a geosynchronous satellite and obtain a coordinated universal time correction parameter UTCp from the navigation message;
a downlink delay calculation module 703, configured to calculate a downlink delay Tdown from the geosynchronous satellite to the time service device based on the uplink delay Tup;
the local time calculating module 704 is configured to calculate a local time T1 of the time service device by using the standard time T0, the uplink time delay Tup, the correction parameter UTCp, and the downlink time delay Tdown;
the time service module 705 is configured to perform time service by using the local time T1.
Optionally, the method further comprises:
the judging module is used for judging whether the local memory of the time service equipment stores the downlink delay Tdown or not;
the downlink delay Tdown reading module is used for reading the downlink delay Tdown from the local memory of the time service equipment;
A skip module, configured to skip to the downlink delay calculation module 703.
Optionally, the downlink delay calculating module 703 includes:
the timing application transmitting unit is used for transmitting a timing application to the ground control center through the geosynchronous satellite, the geosynchronous satellite transmits the timing application to the ground control center after receiving the timing application, and the ground control center calculates the total unidirectional propagation time delay Tc from the ground control center to the time service equipment when receiving the timing application;
a one-way propagation total delay receiving unit for receiving the one-way propagation total delay Tc from the geosynchronous satellite;
and the downlink delay Tdown calculation unit is used for calculating the difference value between the total unidirectional propagation delay Tc and the uplink delay Tup to serve as the downlink delay Tdown.
Optionally, after the downstream delay Tdown calculating unit, the method further includes:
and the downlink delay Tdown storage unit is used for storing the downlink delay Tdown into a local memory of the time service equipment.
Optionally, the downlink delay Tdown storage unit further includes:
the preset event detection unit is used for judging whether a preset event is detected or not;
an adjusting unit, configured to jump to the downlink delay calculating module 703.
Optionally, the downlink delay calculating module 703 includes:
And the downlink time delay Tdown determining unit is used for determining that the downlink time delay Tdown is equal to the uplink time delay Tup.
Optionally, the local time calculation module 704 includes:
the device delay Td acquisition unit is used for acquiring the device delay Td;
a first calculating unit, configured to calculate a difference between the standard time T0 and the correction parameter UTCp;
the second calculating unit is configured to calculate a sum of the difference and the uplink delay Tup, the downlink delay Tdown, and the device delay Td, so as to serve as a local time T1 of the time service device.
The satellite-based time service device provided by the embodiment of the invention can execute the satellite-based time service method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example five
Fig. 8 shows a schematic diagram of an electronic device 80 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 8, the electronic device 80 includes at least one processor 81, and a memory, such as a Read Only Memory (ROM) 82, a Random Access Memory (RAM) 83, etc., communicatively connected to the at least one processor 81, in which the memory stores a computer program executable by the at least one processor, and the processor 81 can perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 82 or the computer program loaded from the storage unit 88 into the Random Access Memory (RAM) 83. In the RAM 83, various programs and data required for the operation of the electronic device 80 can also be stored. The processor 81, the ROM 82 and the RAM 83 are connected to each other via a bus 84. An input/output (I/O) interface 85 is also connected to bus 84.
Various components in the electronic device 80 are connected to the I/O interface 85, including: an input unit 86 such as a keyboard, mouse, etc.; an output unit 87 such as various types of displays, speakers, and the like; a storage unit 88 such as a magnetic disk, an optical disk, or the like; and a communication unit 89, such as a network card, modem, wireless communication transceiver, etc. The communication unit 89 allows the electronic device 80 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunications networks.
Processor 81 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 81 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 81 performs the various methods and processes described above, such as satellite-based time service methods.
In some embodiments, the satellite-based time service method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 88. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 80 via the ROM 82 and/or the communication unit 89. When the computer program is loaded into RAM 83 and executed by processor 81, one or more steps of the satellite-based time service method described above may be performed. Alternatively, in other embodiments, processor 81 may be configured to perform the satellite-based time service method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above can be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), complex Programmable Logic Devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A satellite-based time service method, which is applied to time service equipment, comprising:
receiving a short message signal of a geosynchronous satellite, wherein the short message signal comprises an uplink time delay Tup of a standard time T0 sent to the geosynchronous satellite by a ground control center;
receiving a navigation message of the geosynchronous satellite and acquiring a correction parameter UTCp of the coordinated universal time from the navigation message;
calculating the downlink delay Tdown of the geosynchronous satellite to time service equipment based on the uplink delay Tup;
Calculating the local time T1 of the time service device by adopting the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown;
and carrying out time service by adopting the local time T1.
2. The satellite-based time service method according to claim 1, further comprising, prior to said calculating a downlink delay Tdown of the geosynchronous satellite to a time service device based on the uplink delay Tup:
judging whether a local memory of the time service equipment stores downlink time delay Tdown or not;
if yes, reading downlink delay Tdown from a local memory of the time service equipment;
if not, executing the step of calculating the downlink delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink delay Tup.
3. Satellite-based time service method according to claim 1 or 2, characterized in that said calculating the downlink delay Tdown of the geosynchronous satellite to a time service device based on the uplink delay Tup comprises:
sending a timing application to a ground control center through the geosynchronous satellite, forwarding the timing application to the ground control center after receiving the timing application by the geosynchronous satellite, and calculating the total unidirectional propagation time delay Tc from the ground control center to the time service equipment by the ground control center when receiving the timing application;
Receiving the one-way propagation total delay Tc from the geosynchronous satellite;
and calculating the difference value between the one-way propagation total time delay Tc and the uplink time delay Tup to serve as the downlink time delay Tdown.
4. A satellite based time service method according to claim 3, further comprising, after calculating the difference between the one-way propagation total delay Tc and the upstream delay Tup as the downstream delay Tdown:
and storing the downlink time delay Tdown into a local memory of the time service equipment.
5. A satellite based time service method according to claim 3, further comprising, after storing the downstream time delay Tdown in a local memory of the time service device:
judging whether a preset event is detected or not;
if yes, executing the step of calculating the downlink time delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink time delay Tup.
6. The satellite-based time service method according to claim 1, wherein calculating the downlink delay Tdown of the geosynchronous satellite to a time service device based on the uplink delay Tup comprises:
and determining that the downlink time delay Tdown is equal to the uplink time delay Tup.
7. The satellite-based time service method according to claim 1, wherein said calculating the local time T1 of the time service device using the standard time T0, the uplink time delay Tup, the correction parameter UTCp and the downlink time delay Tdown comprises:
acquiring equipment time delay Td;
calculating the difference value between the standard time T0 and the correction parameter UTCp;
and calculating the sum of the difference value, the uplink delay Tup, the downlink delay Tdown and the equipment delay Td to serve as the local time T1 of the time service equipment.
8. A satellite-based time service apparatus, characterized by being applied to time service equipment, comprising:
the satellite short message signal receiving module is used for receiving short message signals of the geosynchronous satellite, wherein the short message signals comprise uplink delay Tup of standard time T0 sent to the geosynchronous satellite by a ground control center;
the coordination universal time correction parameter determining module is used for receiving the navigation message of the geosynchronous satellite and acquiring a coordination universal time correction parameter UTCp from the navigation message;
the downlink delay calculation module is used for calculating the downlink delay Tdown from the geosynchronous satellite to the time service equipment based on the uplink delay Tup;
The local time calculating module is configured to calculate a local time T1 of the time service device by using the standard time T0, the uplink time delay Tup, the correction parameter UTCp, and the downlink time delay Tdown;
and the time service module is used for performing time service by adopting the local time T1.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the satellite-based time service method of any one of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to perform the satellite-based time service method of any one of claims 1-7.
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