CN111447004B - System and method for broadcasting navigation enhancement data - Google Patents
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- 238000004891 communication Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 18
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/05—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
本发明涉及卫星通信与导航领域，提供了一种导航增强数据的播发系统和方法，包括：多个导航信号观测站、至少两个数据处理中心、至少两个地球站和至少两个地球同步轨道卫星；每个数据处理中心根据多个导航信号观测的观测数据生成导航增强数据并传输到至少两个地球站；每个地球站基于优选策略，根据至少两条导航增强数据生成上注信号并上注给至少一个地球同步轨道卫星；每个地球同步轨道卫星对至少两条上注信号进行处理得到导航增强信号，面向同一服务区域播发导航增强信号，服务区域接收至少两条导航增强信号。本发明可以避免数据处理中心或地球站故障切换时引起的服务中断，降低系统服务的连续性风险，大幅提高星基增强系统的可用性。
The invention relates to the field of satellite communication and navigation, and provides a system and method for broadcasting navigation enhancement data, comprising: a plurality of navigation signal observation stations, at least two data processing centers, at least two earth stations and at least two geosynchronous orbits Satellites; each data processing center generates navigation enhancement data based on the observation data of multiple navigation signals and transmits it to at least two earth stations; each earth station generates and uploads betting signals based on at least two navigation enhancement data based on a preferred strategy. Note to at least one satellite in geostationary orbit; each satellite in geostationary orbit processes at least two signals above to obtain a navigation enhancement signal, broadcasts the navigation enhancement signal to the same service area, and receives at least two navigation enhancement signals in the service area. The invention can avoid the service interruption caused by the data processing center or the earth station failover, reduce the continuity risk of the system service, and greatly improve the availability of the satellite-based enhancement system.
Description
Technical Field
The invention relates to the field of satellite communication and navigation, in particular to a system and a method for broadcasting navigation enhancement data.
Background
The satellite navigation system can provide all-weather, all-time and high-precision real-time navigation positioning service for global users, and is widely applied to a plurality of fields such as traffic, surveying and mapping, geological exploration and the like. However, since the radio signal of the Satellite navigation System is easily affected by the change of radio wave propagation media such as an ionosphere and an atmosphere during the propagation process, the positioning accuracy provided by the basic navigation message is limited, and a quick warning means is lacked when the System service performance is degraded or abnormal, and the Satellite navigation Satellite-Based Augmentation System (SBAS) oriented to the field of civil air transportation is difficult to be effectively applied to the field related to life safety such as civil air transportation.
The satellite-based augmentation system is oriented to a service area, generates navigation augmentation data capable of improving navigation positioning accuracy, integrity, continuity and usability of a satellite navigation system, and broadcasts the navigation augmentation data to users through Geosynchronous Orbit (GEO) satellites covering the service area. However, in the prior art, although the Mean Time Between Failures (MTBF) of the system can be increased by the satellite-based augmentation system, the Mean Time To Repair (MTTR) is long, and the service continuity of the system is risky, which causes a problem of service interruption.
Disclosure of Invention
In view of this, embodiments of the present invention provide a system and a method for broadcasting navigation enhancement data, so as to solve the problems that an average repair time of an existing satellite-based enhancement system is long, and service continuity of the system has a risk and service interruption exists.
A first aspect of an embodiment of the present invention provides a system for broadcasting navigation enhancement data, including: a plurality of navigation signal observers, at least two data processing centers, at least two earth stations, and at least two geosynchronous orbit satellites;
each navigation signal observation station transmits observation data to the at least two data processing centers;
each data processing center generates navigation enhancement data according to a plurality of pieces of observation data and transmits the navigation enhancement data to the at least two earth stations;
each earth station generates an uplink signal according to at least two pieces of navigation enhancement data and transmits the uplink signal to at least one geosynchronous orbit satellite based on a preferred strategy;
each geosynchronous orbit satellite processes the upper-annotating signal to obtain a navigation enhancement signal, and broadcasts the navigation enhancement signal facing to the same service area, and the service area receives at least two navigation enhancement signals.
Furthermore, at least 7 navigation signal observation stations are deployed in the service area and a preset area around the service area, and the at least 7 navigation signal observation stations simultaneously transmit the corresponding observation data to the at least two data processing centers.
Further, the observation data includes: satellite pseudoranges, carrier phases, doppler information, signal-to-noise ratios, and signal correlation values.
Further, the navigation enhancement data generated by each of the data processing centers has the same level of navigation enhancement service performance, and the at least two data processing centers simultaneously transmit the corresponding navigation enhancement data to the at least two earth stations.
Further, the navigation enhancement data includes: satellite ephemeris data, satellite clock data, ionosphere correction data, and corresponding integrity information.
Further, each said earth station is specifically configured to:
receiving the navigation enhancement data for each of the data processing centers;
selecting navigation enhancement data to be transmitted from the at least two pieces of navigation enhancement data according to a preferred strategy, and selecting at least one geosynchronous orbit satellite to be communicated from the at least two geosynchronous orbit satellites;
and converting the navigation enhancement data to be transmitted into an upward injection signal, and upward injecting the upward injection signal to the geosynchronous orbit satellite to be communicated.
Further, the preferred strategy includes:
at least two of the earth stations implement a navigation enhanced data annotating service;
at least one earth station selected navigational enhancement data for performing said wagering service being different from another selected navigational enhancement data for at least two earth stations performing said wagering service;
at least two earth stations implementing the said service of interest must not communicate with the same geosynchronous orbit satellite.
Further, the preferred strategy further comprises:
when the navigation enhancement data to be transmitted have faults or do not meet the preset use requirements, switching the navigation enhancement data, or
And when the navigation enhancement data to be transmitted have faults or do not meet preset use requirements, stopping the uploading service, and switching another one of at least two earth stations for implementing the uploading service to implement the uploading service.
A second aspect of the embodiments of the present invention provides a method for broadcasting navigation enhancement data, which is used on one side of an earth station, and includes:
acquiring at least two pieces of navigation enhancement data, wherein the navigation enhancement data are generated by a corresponding data processing center according to observation data of a plurality of navigation signal observation stations;
generating an upsell signal from at least two pieces of the navigation enhancement data based on a preferred strategy;
and injecting the upward injection signal to at least one geosynchronous orbit satellite so that each geosynchronous orbit satellite processes the upward injection signal to obtain a navigation enhancement signal and broadcasts the navigation enhancement signal to the same service area, wherein the service area receives at least two navigation enhancement signals.
Further, based on a preferred strategy, generating an annotation signal according to at least two pieces of the navigation enhancement data includes:
selecting navigation enhancement data to be transmitted from the at least two pieces of navigation enhancement data according to a preferred strategy, and selecting at least one geosynchronous orbit satellite to be communicated from the at least two geosynchronous orbit satellites;
and converting the navigation enhancement data to be transmitted into an upward injection signal, and upward injecting the upward injection signal to the geosynchronous orbit satellite to be communicated.
Further, the preferred strategy includes:
at least two of the earth stations implement a navigation enhanced data annotating service;
at least one earth station selected navigational enhancement data for performing said wagering service being different from another selected navigational enhancement data for at least two earth stations performing said wagering service;
at least two earth stations implementing the said service of interest must not communicate with the same geosynchronous orbit satellite.
Further, the preferred strategy further comprises:
when the navigation enhancement data to be transmitted have faults or do not meet the preset use requirements, switching the navigation enhancement data, or
And when the navigation enhancement data to be transmitted have faults or do not meet preset use requirements, stopping the uploading service, and switching another one of at least two earth stations for implementing the uploading service to implement the uploading service.
Compared with the prior art, the system and the method for broadcasting the navigation enhancement data have the beneficial effects that: the system comprises a plurality of navigation signal observation stations, at least two data processing centers, at least two earth stations and at least two geosynchronous orbit satellites, and a multiple satellite broadcasting mode is adopted, so that the average fault-free time is improved, and the average repair time is greatly shortened; each data processing center generates navigation enhancement data according to a plurality of pieces of observation data, each earth station generates an uplink signal according to at least two pieces of navigation enhancement data and uplink the uplink signal to at least one geosynchronous orbit satellite based on a preferred strategy, each geosynchronous orbit satellite processes the at least two uplink signals to obtain the navigation enhancement signals, and broadcasts the navigation enhancement signals facing the same service area, so that the service area receives the at least two navigation enhancement signals, service interruption caused by fault switching of the data processing center or the earth station is avoided, the continuity risk of system service is reduced, and the availability of the satellite-based enhancement system is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for broadcasting navigation enhancement data according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another navigation enhancement data dissemination system according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating implementation of a preferred policy provided by an embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating an implementation process of a method for broadcasting navigation enhancement data according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a specific implementation of step S402 in fig. 4.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, a schematic structural diagram of a system for broadcasting navigation enhancement data provided in this embodiment is shown. For convenience of explanation, only the portions related to the present embodiment are shown.
The system for broadcasting navigation enhancement data of the embodiment mainly comprises: a plurality of navigation signal observers 100, at least two data processing centers 200, at least two earth stations 300, and at least two geosynchronous orbit satellites 400. It should be understood that the present embodiment does not limit the number of the navigation signal observation stations 100, the data processing centers 200, the earth stations 300, and the geosynchronous orbit satellites 400, and the number of the navigation signal observation stations 100, the number of the data processing centers 200, the number of the earth stations 300, and the number of the geosynchronous orbit satellites 400 may be multiple, as shown in fig. 1, the number of the navigation signal observation stations 100 may be I, the number of the data processing centers 200 may be N, the number of the earth stations 300 may be M, and the number of the geosynchronous orbit satellites 400 may be L, where I is a positive integer greater than or equal to 7, N is a positive integer greater than or equal to 2, M is a positive integer greater than or equal to 2, and L is a positive integer greater than or equal to 2.
Specifically, each navigation signal observation station 100 acquires observation data and transmits the corresponding observation data to at least two data processing centers 200, that is, to each data processing center 200; each data processing center 200 then generates navigation enhancement data from the plurality of observation data and transmits the navigation enhancement data to each earth station 300; each earth station 300 generates an uplink signal from at least two pieces of the navigation enhancement data based on a preferred strategy and uplink the uplink signal to at least one geosynchronous orbit satellite 400; finally, each geosynchronous orbit satellite 400 processes the above-noted signal to obtain a navigation enhancement signal, and broadcasts the navigation enhancement signal to the users in the service area according to the user requirements in the service area, that is, the users in the service area can receive at least two navigation enhancement signals.
In practical application, the satellite-based augmentation system has a nearly rigorous requirement on the continuity of system services, and in the traditional broadcasting method, users in a service area can only receive 1 group of navigation augmentation data, so that the continuity of the system services has risks and possibly has the problem of service interruption, and once a fault occurs, the repair time is long, and the availability of the system is reduced.
In this embodiment, in order to reduce the risk of interruption of the navigation enhancement service, generally, 2 or more data processing centers 200 are built to generate 2 sets or more sets of navigation enhancement data, and 2 or more geosynchronous orbit satellites 400 are configured to broadcast the navigation enhancement signals at the same time, so that when one set of navigation enhancement data being broadcast has a problem, another set of navigation enhancement data can be quickly started and switched to be broadcast, the average time without failure of the system is increased, the time for recovery from the failure interruption is shortened, and the continuity of the system service is ensured.
Illustratively, I satellite navigation signal observation stations 100 are deployed in a service area and a peripheral preset area, the observation stations generate observation data and transmit the observation data to N data processing centers 200, and the N data processing centers 200 respectively generate navigation enhancement data with the same service performance by using the observation data sent by the observation stations and transmit the navigation enhancement data to M earth stations 300; the M earth stations 300 then receive the navigation enhancement data from the N data processing centers 200, where the navigation enhancement data may include the satellite ephemeris correction parameters, the satellite clock correction parameters, the ionospheric correction numbers, and corresponding integrity information, etc. generated by each data processing center 200 and to be broadcast.
The M earth stations 300 convert the navigation enhancement data into an uplink signal, and respectively uplink N groups of navigation enhancement data to the L geosynchronous orbit satellites 400 according to an optimal strategy; the L geosynchronous orbit satellites 400 generate navigation enhancement signals through on-satellite processing, and broadcast the navigation enhancement signals facing the same service area; users in the service area can simultaneously receive the navigation enhancement data generated by at least 2 groups of different data processing centers 200, so that the interruption of the broadcasting of the navigation enhancement data caused by the fault of a single or partial data processing center 200 is avoided, and the service continuity risk of the navigation enhancement system is reduced.
Optionally, at least 7 navigation signal observation stations 100 are deployed in the service area and a preset area around the service area, so that accurate and complete data can be observed, and at least 7 navigation signal observation stations 100 transmit corresponding observation data to at least two data processing centers 200 at the same time, thereby reducing occurrence of time delay and ensuring that each data processing center 200 receives data at the same time. Further, the observation data of the present embodiment may include, but is not limited to, the following information: satellite pseudoranges, carrier phases, doppler information, signal-to-noise ratios, and signal correlation values.
Optionally, each data processing center 200 receives observation data of each observation station, and independently resolves and generates navigation enhancement data, the navigation enhancement data generated by each data processing center 200 has navigation enhancement service performance of the same level, and all the data processing centers 200 transmit corresponding navigation enhancement data to each earth station 300 at the same time, so as to reduce occurrence of time delay and ensure that each earth station 300 receives data at the same time. Further, the navigation enhancement data of the present embodiment may include, but is not limited to, the following information: satellite ephemeris data, satellite clock data, ionosphere correction data, and corresponding integrity information.
Further, each earth station 300 is specifically configured to:
the navigation enhancement data for each data processing center 200 is received.
The navigation enhancement data to be transmitted is selected among the at least two navigation enhancement data according to a preferred strategy, and at least one geosynchronous orbit satellite 400 to be communicated is selected among the at least two geosynchronous orbit satellites 400.
And converting the navigation enhancement data to be transmitted into an upward injection signal, and injecting the upward injection signal to the geosynchronous orbit satellite 400 to be communicated.
Each earth station 300 receives the navigation enhancement data of each data processing center 200, selects the navigation enhancement data and the geosynchronous orbit satellite 400 according to a preferred strategy, converts the selected navigation enhancement data into an upcast signal, and upcasts the selected geosynchronous orbit satellite 400. Optionally, the earth station 300 may annotate the navigation enhancement data to 1 or multiple geosynchronous orbit satellites 400 at the same time, or may wait for the navigation enhancement data annotating service to be temporarily not implemented, thereby saving the broadcasting resources of the satellites.
Optionally, the preferred policy of this embodiment may include: selecting an earth station 300 for implementing the betting service, selecting navigational augmentation data, selecting a betting satellite, and measures in the event of a failure or an unsatisfactory requirement of the selected navigational augmentation data, a schematic diagram of a preferred strategy is shown within the dashed box of fig. 2. Specifically, the following steps are taken:
at least two earth stations 300 implement the navigation enhancement data upload service such that more than one of the M earth stations 300 uploads navigation enhancement data to the geosynchronous orbit satellite 400.
The navigation enhancement data selected by at least one earth station 300 implementing said upsell service is different from the navigation enhancement data selected by other earth stations 300 implementing said upsell service, so that the data selected by the earth stations 300 implementing the navigation enhancement data upsell service is not identical.
At least two earth stations 300 implementing said betting service must not communicate with the same geosynchronous orbit satellite 400, i.e. one earth station 300 implementing said betting service may be assigned to one betting satellite or to a plurality of betting satellites, but different earth stations 300 must not be assigned to the same betting satellite.
Further, when the navigation enhancement data to be transmitted fails or does not meet the preset use requirement, another piece of navigation enhancement data may be switched, or when the navigation enhancement data to be transmitted fails or does not meet the preset use requirement, the service of uploading the current earth station 300 is stopped, and other earth stations 300 implementing the service of uploading are switched to implement the service of uploading.
Referring to fig. 3, a schematic diagram of an implementation flow of the preferred strategy of this embodiment is specifically as follows:
in step S301, the earth station 300 that performs the betting service is selected from the M earth stations 300.
Step S302, judging whether the number of the earth stations 300 which are selected to implement the upper note service is more than or equal to 2, if so, executing step S303, otherwise, executing step S301 again.
Step S303, determining whether different earth stations 300 implementing the service of betting are betting on the same geosynchronous orbit satellite 400, if different earth stations 300 are betting on different satellites, executing step S304, otherwise, executing step S301 again.
Step S304, navigation enhancement data is selected for the earth station 300 implementing the top-note service.
In step S305, it is determined whether the navigation enhancement data selected by each earth station 300 are the same, and if they are different, step S306 is executed, and if they are the same, step S304 is executed.
Step S306, judging whether navigation enhancement data has faults or not, if no faults exist, finishing the implementation of the preferred strategy, otherwise, executing step S307.
In step S307, when it is detected that the navigation enhancement data has a failure, the failure data is discarded, and the process continues to step S308.
And step S308, judging whether the earth station 300 corresponding to the group of fault data on which the notes are applied needs to be replaced or not, if not, re-executing step S304, otherwise, re-executing step S301.
Assuming that the failures of each set of navigation enhancement data occur independently and the probabilities are the same as Pe, the mean time to failure of a single set of navigation enhancement data is T1 ═ 1/Pe, and when 2 different sets of navigation enhancement data are broadcast simultaneously, the mean time to failure is T2 ═ 1/Pe2, where Pe2 is the probability that two sets of navigation enhancement data fail simultaneously, and Pe < <1, therefore T2> T1, i.e. the mean time to failure of the system to broadcast 2 sets of navigation enhancement data simultaneously is much longer than the mean time to failure of the system to broadcast only a single set of navigation enhancement data.
In addition, if the navigation enhancement data being broadcast has a fault and another group of navigation enhancement data needs to be broadcast in a switching manner, the average repair time of the fault broadcast by the system adopting the traditional main-standby switching manner is t. Accordingly, in the system of this embodiment, since the system broadcasts at least two sets of navigation enhancement data simultaneously, when one set of navigation enhancement data fails and the broadcast of the set of navigation enhancement data is interrupted, since the navigation enhancement data of the other sets are still broadcast normally, the system can maintain continuous service to the user, that is, the average repair time equivalent to the system broadcast failure caused thereby is zero. Therefore, the average failure-free time is improved, and the average repair time is greatly shortened.
Illustratively, the satellite navigation signal observers 100 deployed in and around the service area generate observation data to be transmitted to two or more data processing centers 200, and the data processing centers 200 respectively generate navigation enhancement data with the same service performance by using the observation data to be transmitted to 2 or more earth stations 300. Then each earth station 300 selects the navigation enhancement data and the geosynchronous orbit satellites 400 according to a preferred strategy, one earth station 300 implementing the injection service can be allocated with one injection satellite or a plurality of injection satellites, but different earth stations 300 cannot be allocated with the same injection satellite, and the navigation enhancement data selected by at least one earth station 300 implementing the injection service is ensured to be different from the data selected by other earth stations 300 implementing the injection service, when the selected navigation enhancement data fails or does not meet the use requirement, the navigation enhancement data is switched, or the injection service is stopped to switch other earth stations 300 to implement the injection service. Finally, at least two geosynchronous orbit satellites 400 generate navigation enhancement signals through on-satellite processing, and the navigation enhancement signals are broadcasted facing a service area, so that users in the service area can simultaneously receive navigation enhancement data generated by at least 2 groups of different data processing centers 200, the interruption of the broadcasting of the navigation enhancement data caused by the fault of a single or partial data processing center 200 is avoided, and the continuity risk of the service of the navigation enhancement system is reduced.
Therefore, this embodiment is different from the conventional master/slave switching broadcast mode, in which N data processing centers 200 of this embodiment respectively generate navigation enhancement data with the same service performance and transmit the navigation enhancement data to M earth stations 300, the earth stations 300 convert the navigation enhancement data into an uplink signal, and uplink N sets of navigation enhancement data to L geosynchronous orbit satellites 400 respectively according to an optimal strategy, so that a user in a service area can simultaneously receive at least 2 sets of navigation enhancement data generated by different data processing centers 200.
The system for broadcasting the navigation enhancement data adopts a multiple satellite broadcasting mode, M earth stations 300 broadcast data from N groups of different data processing centers 200 to L satellites simultaneously, a user in a service area can receive two or more sets of navigation enhancement data simultaneously, when one set of navigation enhancement data is broadcasted temporarily due to a fault, the user can still use the other set of navigation enhancement data to realize the required navigation positioning performance, the service interruption caused by fault switching of the data processing centers or the earth stations is avoided, and after the fault is recovered, different sets of navigation enhancement data are still selected to be broadcasted, so that the continuity of system service is effectively improved, and the system availability is improved; and the navigation enhancement data, the earth station 300 and the geosynchronous orbit satellite 400 can be selected by using an optimal strategy, so that the average failure-free time is improved, the average repair time is greatly shortened, the users in the service area can receive at least two navigation enhancement signals, and the continuity risk of the system service is reduced.
The present embodiment further provides a method for broadcasting navigation enhancement data, which is used on the earth station 300 side, as shown in fig. 4, and is an implementation flow diagram of the method for broadcasting navigation enhancement data of the present embodiment, which is detailed as follows:
step S401, at least two pieces of navigation enhancement data are acquired, and the navigation enhancement data are generated by the corresponding data processing center 200 according to the observation data of the plurality of navigation signal observation stations 100.
Step S402, based on the preferred strategy, generating an upper note signal according to at least two pieces of navigation enhancement data.
Step S403, the uplink signal is injected to at least one geosynchronous orbit satellite 400, so that each geosynchronous orbit satellite 400 processes the uplink signal to obtain a navigation enhancement signal, and broadcasts the navigation enhancement signal to the same service area, where the service area receives at least two navigation enhancement signals.
Optionally, the observation data includes, but is not limited to, the following information: satellite pseudoranges, carrier phases, doppler information, signal-to-noise ratios, and signal correlation values. The navigation enhancement data includes, but is not limited to, the following information: satellite ephemeris data, satellite clock data, ionosphere correction data, and corresponding integrity information.
In one embodiment, referring to fig. 5, the specific implementation flow of step S402 includes:
step S501, selecting navigation enhancement data to be transmitted from at least two pieces of navigation enhancement data according to a preferred strategy, and selecting at least one geosynchronous orbit satellite 400 to be communicated from the at least two geosynchronous orbit satellites 400;
step S502, converting the navigation enhancement data to be transmitted into an upward injection signal, and upward injecting the upward injection signal to the geosynchronous orbit satellite 400 to be communicated.
Further, the preferred strategy includes:
at least two of the earth stations 300 implement a navigation enhanced data annotating service;
navigation enhancement data selected by at least one earth station 300 implementing said wagering service being different from navigation enhancement data selected by another of at least two earth stations 300 implementing said wagering service;
at least two earth stations 300 implementing the service of interest must not communicate with the same geosynchronous orbit satellite 400.
Further, the preferred strategy further comprises:
when the navigation enhancement data to be transmitted have faults or do not meet the preset use requirements, switching the navigation enhancement data, or
And when the navigation enhancement data to be transmitted have faults or do not meet preset use requirements, stopping the uploading service, and switching another one of the at least two earth stations 300 for implementing the uploading service to implement the uploading service.
According to the method for broadcasting the navigation enhancement data, a multiple satellite broadcasting mode is adopted, so that the average fault-free time is prolonged, and the average repair time is greatly shortened; each data processing center 200 generates navigation enhancement data according to a plurality of pieces of observation data, each earth station 300 generates an upcast signal according to at least two pieces of navigation enhancement data and upcasts the upcast signal to at least one geosynchronous orbit satellite 400 based on a preferred strategy, each geosynchronous orbit satellite 400 processes the at least two upcast signals to obtain the navigation enhancement signal, and broadcasts the navigation enhancement signal facing the same service area, so that the service area receives the at least two navigation enhancement signals, service interruption caused by fault switching of the data processing center or the earth station is avoided, the continuity risk of system service is reduced, and the availability of a satellite-based enhancement system is greatly improved.
It should be understood by those skilled in the art that the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
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