CN113009529B - Method and system for supporting mobile terminal to carry out satellite signal retrieval switching - Google Patents
Method and system for supporting mobile terminal to carry out satellite signal retrieval switching Download PDFInfo
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- CN113009529B CN113009529B CN201911330610.7A CN201911330610A CN113009529B CN 113009529 B CN113009529 B CN 113009529B CN 201911330610 A CN201911330610 A CN 201911330610A CN 113009529 B CN113009529 B CN 113009529B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application relates to the field of positioning and discloses a method and a system for supporting a mobile terminal to carry out satellite signal retrieval switching. The method comprises the following steps: when the satellite broadcasts the SSR correction number, the positioning matching information is synchronously broadcast; and the mobile terminal calculates the current position of the mobile terminal according to the received SSR correction number broadcast by the satellite, acquires the current grid where the current position is located, and judges whether the mobile terminal needs to be switched among grids according to the motion speed and the motion direction of the mobile terminal and the received positioning matching information. By means of the number-correcting and broadcasting nesting mechanism, positioning supporting information is synchronously broadcasted when the number-correcting is broadcasted, and the problem of low-efficiency processing mechanism when a mobile terminal which uses a GNSS observation value and an SSR position number-correcting to perform positioning needs to switch between grids, satellite beams and/or GEO satellites when PPP-RTK numbers are used for correcting is effectively solved.
Description
Technical Field
The present application relates to the field of satellite positioning, and in particular, to a technology for supporting a mobile terminal to perform satellite signal retrieval switching.
Background
Currently, the way of communicating with the ground through satellites has become more and more common, and the applications also tend to be diversified: from former satellite television and telephone, the method evolves to present-day satellite positioning, automatic driving, unmanned aerial vehicle positioning, information transmission and the like. Among them, it is obvious that an object receiving a satellite signal gradually evolves from a stationary terminal to a dynamic terminal. In this case, there is a problem: in the case where the terminal is moving, there is a case where it frequently moves between two or more satellite signal coverage areas. This situation can present a significant problem: if the terminal frequently moves in the coverage area of two or more satellite signals, the terminal needs to frequently switch and track the current satellite signal, which causes application problems such as blocked satellite signal transmission and the like.
In the present case, there are two methods to solve the above problems:
a) the mobile terminal stores all possible satellite signals and their associated messages
The method has the problems that a large amount of terminal memory is occupied, all stored satellite information needs to be traversed each time, time consumption and power consumption are high, so that the cost of the terminal is increased, and large-scale commercialization cannot be realized.
b) The satellite transmits information about all the satellites involved
The method has the problems that a large amount of satellite signal transmission bandwidth is occupied, so that the effective rate of satellite transmission is reduced, a large amount of redundant information is generated, and the commercialization cost is increased sharply.
In summary, it is highly desirable to find a balance between the methods a) and b), so as to reduce redundant extra resource consumption from both ends of the mobile terminal-satellite, and ensure that the mobile terminal can implement a flexible switching function between satellite signals, thereby implementing a dynamic policy of the mobile terminal.
Disclosure of Invention
The method and the system for supporting the mobile terminal to carry out satellite signal retrieval switching solve the problem of an inefficient processing mechanism when a mobile terminal which uses a GNSS observation value and an SSR position correction number to carry out positioning needs to carry out switching among grids, satellite beams and/or GEO satellites when the mobile terminal uses a PPP-RTK correction number.
In order to solve the above technical problem, an embodiment of the present invention discloses a method for supporting a mobile terminal to perform satellite signal retrieval switching, including the following steps:
when the satellites broadcast the SSR correction numbers, positioning matching information is synchronously broadcast, wherein the positioning matching information comprises wave beam information corresponding to each GEO satellite and grid information corresponding to each wave beam, and the grid information comprises longitude and latitude information of a grid;
and the mobile terminal calculates the current position of the mobile terminal according to the received SSR correction number broadcast by the satellite, acquires the current grid where the current position is located, and judges whether the mobile terminal needs to be switched among grids according to the motion speed and the motion direction of the mobile terminal and the received positioning matching information.
The embodiment of the invention also discloses a system for supporting the mobile terminal to carry out satellite signal retrieval switching, which is used for executing the method.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
through the correction number broadcasting mechanism, when the correction number is broadcasted, the positioning matching information is synchronously broadcasted, and the problem of low efficiency processing mechanism when the mobile terminal which uses the GNSS observation value and the SSR position correction number for positioning needs to be switched among grids, satellite beams and/or GEO satellites is effectively solved.
Furthermore, the positioning matching information is broadcast in a three-layer nested loop mode, so that the flow can be saved to the utmost extent, and the transmission bandwidth of satellite signals is effectively reduced.
The present specification describes a number of technical features distributed throughout the various technical aspects, and if all possible combinations of technical features (i.e. technical aspects) of the present specification are listed, the description is made excessively long. In order to avoid this problem, the respective technical features disclosed in the above summary of the invention of the present application, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (which are considered to have been described in the present specification) unless such a combination of the technical features is technically infeasible. For example, in one example, the feature a + B + C is disclosed, in another example, the feature a + B + D + E is disclosed, and the features C and D are equivalent technical means for the same purpose, and technically only one feature is used, but not simultaneously employed, and the feature E can be technically combined with the feature C, then the solution of a + B + C + D should not be considered as being described because the technology is not feasible, and the solution of a + B + C + E should be considered as being described.
Drawings
Fig. 1 is a flowchart illustrating a method for supporting a mobile terminal to perform a satellite signal retrieval handover according to a first embodiment of the present application;
FIG. 2 is a schematic diagram illustrating coverage area subdivision of two satellite signals according to a first embodiment of the present application;
FIG. 3 is a logic flow diagram illustrating the use of GNSS observations and PPP-RTK corrections by a mobile terminal in accordance with a first embodiment of the present application;
fig. 4 is a schematic processing flow diagram of a mobile terminal after receiving beam information according to the first embodiment of the present application.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application may be implemented without these technical details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment of the invention relates to a method for supporting a mobile terminal to search and switch satellite signals. Fig. 1 is a flowchart illustrating a method for supporting a mobile terminal to perform a satellite signal retrieval handover.
Specifically, as shown in fig. 1, the method for supporting a mobile terminal to perform a satellite signal search handover includes the following steps:
in step 101, when the satellite broadcasts the SSR correction number, it synchronously broadcasts positioning supporting information, where the positioning supporting information includes beam information corresponding to each GEO satellite and grid information corresponding to each beam, and the grid information includes longitude and latitude information of the grid.
In the present embodiment, it is preferable that,
the format of the positioning matching information comprises a header and a message body, wherein the message body comprises a three-layer nested loop, which respectively comprises: loop 1, loop 2, and loop 3, the three-layer nested loop logic being { loop 1[ loop 2 (loop 3) ] }; wherein the content of the first and second substances,
the cycle 1 is used to traverse all GEO satellites; the cycle 1 comprises: the ID of each GEO satellite and the synchronous orbital position of each GEO satellite. In one embodiment, loop 1 may be omitted, or the digest is merged into loop 2.
The loop 2 is used for traversing all beams corresponding to the satellites in the loop 1; the cycle 2 comprises: the beam ID corresponding to the satellite, the area covered by the satellite, the current frequency of the current beam, the expiration time of the current frequency, the future frequency and the effective time of the future frequency.
The loop 3 is used for traversing all grids corresponding to the beams in the loop 2; the cycle 3 comprises: the grid ID corresponding to the beam, the area covered by the beam, the longitude and latitude starting point of the grid, the step length and the grid angle.
The positioning matching information is broadcasted in a three-layer nested loop mode, so that the flow can be saved to the utmost extent, and the transmission bandwidth of satellite signals is effectively reduced.
The synchronous broadcast positioning supporting information is not necessarily broadcast accurately and simultaneously, and may be broadcast in the same period, for example.
The longitude and latitude information of the grid comprises a longitude and latitude starting point, a step length and a grid angle of the grid.
The beam information corresponding to each GEO satellite includes a current frequency of each beam of each GEO satellite, an expiration time of the current frequency, a future frequency, and an effective time of the future frequency.
Then, step 103 is entered, and the mobile terminal calculates the current position of the mobile terminal according to the received SSR correction number broadcast by the satellite.
Then, step 107 is performed, and it is determined whether the mobile terminal needs to switch between grids according to the moving speed and moving direction of the mobile terminal and the received positioning supporting information.
Further, preferably, in step 107, the following sub-steps may be included:
acquiring the distance between the current position of the mobile terminal and the boundary of the current grid according to the longitude and latitude information of the current grid;
and pre-judging the pre-judging switching time point when the mobile terminal reaches the boundary of the current grid according to the movement speed and the speed direction of the mobile terminal.
In addition, the method for supporting the mobile terminal to perform satellite signal retrieval switching may further include the following steps:
determining a neighboring mesh that is closest to the current mesh along the velocity direction; and
and judging whether the current grid and the adjacent grid belong to the same beam.
It should be noted that the current mesh may have a plurality of beams, which are called beams to which the current mesh belongs. Only the beam to which the mobile terminal belongs at the frequency being used by the current mesh is called the current beam.
The beams to which the current mesh and the neighboring meshes belong may include the following three cases:
(1) the current mesh belongs to a plurality of beams and the adjacent mesh belongs to a plurality of beams;
(2) the current mesh belongs to one beam and the adjacent mesh belongs to a plurality of beams;
(3) the current mesh belongs to multiple beams and the neighboring meshes belong to one beam.
Further, preferably, when the current mesh and/or the adjacent mesh belong to a plurality of beams, the step of determining whether the current mesh and the adjacent mesh belong to the same beam includes the following sub-steps:
determining a current beam to which a current frequency adopted by the mobile terminal in the current grid in real time belongs;
and judging whether the current beam is the same as any beam of the adjacent grids.
Therefore, when it is determined that the current mesh and the adjacent mesh belong to different beams, the mobile terminal switches the beams when leaving the current mesh, and determines the switching frequency according to the current frequency of the beam to which the current mesh and the adjacent mesh belong, the expiration time of the current frequency, the future frequency, and the effective time of the future frequency.
In particular, the first and second (c) substrates,
firstly, judging whether the current frequency is expired according to the current frequency and the expiration time of the current frequency:
if the current frequency is not expired, judging whether the future frequency is effective or not according to the future frequency and the effective time of the future frequency:
if the frequency is effective, the future frequency is directly switched when the frequency passes through the grid boundary, and if the frequency is not effective, the current frequency is used when the frequency passes through the grid boundary.
If the current frequency is expired, whether the future frequency is effective is judged according to the future frequency and the effective time of the future frequency:
if the frequency is effective, the future frequency is directly switched when passing through the grid boundary, if the frequency is not effective, an alarm is given, no action can be allowed, which is equivalent to a jump-out judgment, and the decision is judged by the next circulation.
In addition, when it is determined that the current grid and the adjacent grid belong to different beams, the method for supporting the mobile terminal to perform satellite signal retrieval switching may further include the following steps:
and judging whether the beam to which the current grid belongs and the beam to which the adjacent grid belongs belong to the same GEO satellite. This helps to help the terminal determine the antenna reception direction.
In summary, the present application broadcasts the nesting mechanism through the correction number, and when the correction number is broadcasted, the positioning support information is synchronously broadcasted, so as to effectively solve the problem of inefficient processing mechanism when the mobile terminal which uses the GNSS observation value and the SSR position correction number to perform positioning needs to switch among the grid, the satellite beam and/or the GEO satellite when the correction number is used.
In order to better understand the technical solutions of the present description, the following description is given with reference to a specific example, in which the listed details are mainly for the sake of understanding, and are not intended to limit the scope of the present application.
When the mobile terminal needs to obtain the performance of converging to centimeter level in one minute, the PPP-RTK technology must be used when the observed value of the GNSS system and the SSR correction (divided into PPP/PPP-AR/PPP-RTK three-layer correction) broadcast by the GEO satellite are needed. In using the PPP-RTK technique, there are currently two techniques: a region spherical cap harmonic model and a region grid (cell) model, and the technique adopted in the preferred embodiment is the region grid model. In the prior art, GEO satellites typically only transmit correction information and do not transmit additional information related to the correction information, such as grid (cell) information. Therefore, when the mobile terminal needs cell information to further verify the position or perform subsequent operations, the cell information needs to be derived locally at the mobile terminal according to the correction information (but only the cell information can be derived, and satellite and beam (beam) information cannot be derived), which not only makes the boundary of the grid difficult to define, but also easily causes great errors or deviations when receiving interference.
One objective of the preferred embodiment is to design broadcast content of the satellite, and synchronously broadcast positioning supporting information when the correction number is broadcast, where the positioning supporting information includes GEO synchronous orbit satellite information, beam information corresponding to each satellite, and cell grid information corresponding to each beam.
Due to concerns about the commercial availability of mobile terminals and current GEO satellite traffic limitations, it is often difficult for a single satellite to satisfy a wide spread of corrections containing cell information. Therefore, it is currently common to distribute correction information to terrestrial mobile terminals via multiple beam/transponded satellites. This introduces the problem of the mechanism by which the mobile terminal switches between different cells/beams/transponded satellites. The relationship among the satellite, the beam and the cell may be as shown in table 1:
TABLE 1
By way of example of signal overlap between two satellites, fig. 2 shows a subdivision of the coverage area of two satellite signals: if there are two boundaries of satellite signals currently (for example, Sat-1 and Sat-2 in fig. 3), 10 path situations of the mobile terminal are shown in fig. 2 (assuming that the path is a black solid curve, No.1-10 from left to right) if considered in conjunction with a standard line (Switching Point) of the latest opportunity at which the mobile terminal needs to switch, where the Switching Point is the maximum extension boundary of the current cell of the current beam of the current satellite, that is, beyond this Point, the current satellite signal cannot be received. In the prior art, although a mobile terminal can derive cell information corresponding to a current position, only cell information under a beam corresponding to a current satellite can be derived, when the terminal moves, the terminal is likely to enter other beams due to exceeding a coverage range of the current beam, so that the cell information of a new position is unacceptable, and positioning accuracy and convergence time are rapidly reduced. In these 10 cases, the mobile terminal will traverse the buffer Zone (Buffering Zone) from below (Sat-2 Zone, where Transition Zone represents the Transition Zone) and eventually reach the coverage area of another satellite (Sat-1) as the path proceeds from left to right. Of these, cases 4-5 require two handovers (No. of Changes), and cases 6-10 require one handover. If no appropriate mechanism is introduced, it may cause frequent handover problems for the mobile terminal, such as: before a certain mobile terminal does not know the Switching Point information of a specific object, a hard handover mechanism is adopted, that is, a mechanism which mainly switches to another satellite to receive signals when a certain longitude and latitude Point (new to the last Long) is exceeded. The mechanism can cause frequent switching between two/a plurality of satellite signals when the mobile terminal is frequently switched near the longitude and latitude specified by the hard switching mechanism, thereby greatly influencing the quality of information received by the mobile terminal and finally influencing the positioning effect.
In addition, due to the constraint of factors such as the activity degree of the earth atmosphere, the user demand, the convergence time/precision and the like, the distribution of the cells should also be dynamically adjustable, so as to achieve the best service standard of correction number. Under this premise, it becomes necessary to broadcast dynamic mesh information to mobile terminals. It is important to provide the information needed by the mobile providing terminal to the maximum extent while saving valuable satellite traffic, avoiding the hard handoff mechanism of frequent handoff.
When switching each time, the mobile terminal needs to acquire the positioning matching information of each satellite, and the method comprises the following steps: 1. a signal coverage range; 2. the current satellite frequency and its expiration time; 3. the possible future frequency of the current satellite and the effective time thereof; 4. other information under the current region. In this case, the mobile terminal needs to receive the full amount of information, and obtains and calculates the current position of the mobile terminal through various different permutation and combination, so as to make a decision whether to switch satellite beams. We refer to this positioning overhead temporarily as beam messages.
As shown in fig. 2, in case 4-10, the terrestrial mobile terminal acquires the positioning supporting information of the satellite, thereby completing the frequency switching and the collection of the rest information. Therefore, in the preferred embodiment, when the satellite broadcasts the correction number, it is required to synchronously broadcast the positioning supporting information (i.e. beam message), where the positioning supporting information includes GEO satellite information, beam information corresponding to each satellite, and cell information corresponding to each beam.
Moreover, in the preferred embodiment, the flow can be minimized by preferably adopting a nesting mode. Specifically, table 2 shows an example of a specific nesting manner.
TABLE 2
In table 2 above, the message design is divided into two parts: header and Body.
The header is used for determining the message type and time of the current received message when the mobile terminal decodes, and the message body is used as a circulation label required by circulation when data is retrieved. The message body contains all contents and information that the mobile terminal needs to know, and specifically contains: 1. signal coverage (synchronous orbital position of each GEO satellite); 2. the frequency of each beam of the current satellite and its expiration time; 3. the possible future frequency of each wave beam of the current satellite and the effective time thereof; 4. and (4) latitude and longitude information of the cell in the current area under each beam (the latitude and longitude information of the cell can be integrated to obtain the coverage of beam).
For cell information, people only need to know the longitude and the latitude to use the cell information for subsequent use.
For beam information, not only the coverage range but also the current and future frequency information are needed to be used, wherein the coverage range can be reversely deduced through the cell information received by the terminal, so that only the relevant frequency information needs to be broadcasted by a satellite.
Similarly, in order to obtain the accurate position of the GEO satellite, the coverage of the GEO satellite needs to be reversely deduced through the coverage information of the beam, and meanwhile, the orbit information is also needed, so the satellite needs to broadcast the orbit information.
Specifically, the message body shown in table 2 above contains a total of three nested levels of loops for traversing all satellites (loop 1), all satellite beams (loop 2), and the region (grid) information below each beam (loop 3). The nesting logic is { loop 1[ loop 2 (loop 3) ] }, so the overall message body loop number is:
maximum cycle number is maximum cycle number of cycle 3, Ncells/B, maximum cycle number of cycle 2, B, maximum cycle number of cycle 1, Y.
In the loop 1, all currently possible satellites (Current Satellite IDs) and their positions (Satellite positions) are traversed, the maximum Y of the Current design is 7, the specific numerical value can be adjusted according to the use condition of the real system, and theoretically (2)n) -1 satellite, n ═ number of bits needed.
In cycle 2, the contents of all beams contained in the current satellite in cycle 1 need to be traversed, including: the beam ID of the Current satellite (Current GEO satellites' beam ID), how many areas the Current satellite covers (Current Cell Mask), the real-Time frequency of the Current satellite beam (Current frequency) and its validity period (Valid Time wall GPS week + GPS second), and the frequency to which it may change in the future (Update frequency) and its validity date (Valid Time wall GPS week + GPS second). In the preferred embodiment, the frequency uses the L-band as an example, and the range can be adjusted according to actual situations in practical use.
In the loop 3, all areas covered by the current beam (cell, in the preferred embodiment, the upper limit is assumed to be 60, which may be adjusted according to the actual situation) need to be traversed, including Longitude and Latitude initial points (Coverage Coordinates-Starting points of Longitude and Latitude) of the areas, based on the step length (Steps for Longitude and Latitude) of the Longitude and Latitude points, and based on the rotation Angle (Angle of the cell) of the center of the circle of the current area. Having the above data in cycle 3, the terminal can invert the coverage area of each cell according to this information, thereby implementing the frequency switching of cases 4-10 in fig. 2 in conjunction with its terminal switching algorithm.
It should be noted that, the handover of the mobile terminal is based on the cell and under different beam and GEO satellites. The precondition that the mobile terminal switches the cell successfully is to know the SSR-3 correction number of the switched cell and to position the configuration information (including the longitude and latitude of the switched grid, the angle of the switched grid and the like).
The following describes handover of a mobile terminal between different cells in three specific cases:
1. when the mobile terminal is to be handed over from cell1 to cell2 with the satellite and beam:
consistent with the switching mode in the prior art, when a mobile terminal needs to perform cell switching under the condition of the same beam (which must be the same as the satellite), the information needed to be used is as follows: the current location (current location) of the mobile terminal, the motion direction of the mobile terminal, the Longitude and Latitude information (Coverage codes-Starting point of Longitude & altitude) of the cell in the motion direction, the step length (Steps for Longitude & altitude) of the Longitude and Latitude information, and the Angle (Angle of the cell) of the cell. The first two messages are obtained by the mobile terminal, and the last three messages are obtained by the beam message. On the basis of the obtained three pieces of information, the mobile terminal can obtain detailed longitude and latitude information and distribution shapes of peripheral grids through calculation, so that the switching time point is pre-judged by combining known information (SSR correction number information related to all cells under the current beam of the current satellite) of the mobile terminal, and reasonable switching is performed.
2. When a mobile terminal is to be handed over from cell1 to another beam's cell2 from the same satellite:
when the mobile terminal needs to switch to another beam, because the SSR correction number (for example, SSR-3) locates the characteristics of itself (the ground areas under the coverage areas of all beams of all satellites are covered by cells with different sizes, so as to implement services), the principle is similar to the above case 1, and needs to obtain: the current location of the mobile terminal, the moving direction of the mobile terminal, the Longitude and Latitude information (Coverage Coordinates-Starting point of Longitude & altitude) of the cell in the moving direction, the step length (Steps for Longitude & altitude) of the Longitude and Latitude information and the Angle (Angle of the cell) of the cell.
However, because at this point the cell to which the handoff is to be made is under a different beam, the current beam cannot provide an SSR-3 message for another beam to which the handoff is to be made (because under another beam the mobile terminal cannot receive and store two satellite signals at the same time). Therefore, the mobile terminal needs to know in advance the frequency message (Current frequency, expiration Time of Current frequency (GPS) week + GPS second), future frequency (Update frequency) and effective Time of future frequency (Valid Time from GPS) week + GPS second) of the beam to which the handover is to be performed, and all the Cell information (Cell ID, codes-Starting point of length & delay, Steps for length & delay, and Angle of the Cell) included under the new beam. Therefore, the broadcasting frequency and the effective date of the new beam and the longitude and latitude information of all cells contained in the new beam can be obtained. The mobile terminal can obtain all information of the current beam and the beam to be switched to by storing the information and combining with the local known positioning and direction, and predict the switching time point by combining with the known information (SSR-3 information related to all cells under the current beam of the current satellite) of the mobile terminal to perform reasonable switching.
3. When the mobile terminal is to be handed over from cell1 to a cell of another beam of a different GEO satellite:
in this case, the mobile terminal needs to learn the position of its GEO satellite based on the above-mentioned case 2, so as to obtain the position of another GEO satellite on the synchronous orbit, and precisely adjust the direction of the local antenna, so as to obtain better satellite signal quality. Therefore, the positions of all GEO satellites are obtained by combining the Satellite positions (Satellite positions) of the beam messages with the current Satellite ID (current Satellite ID), and the switching time points are pre-judged by combining the information of beams and cells related to each Satellite and the known information (SSR-3 information related to all cells under the current beam of the current Satellite) of the Satellite, so that reasonable switching is performed.
Thus, all of the information in Table 2 above, and the information associated therewith, may be distributed to the mobile terminal user via a nested format.
After receiving all the information in table 2, the user of the mobile terminal can first determine whether the cell is in the current cell by self-positioning.
After obtaining the correction information and the information in table 2 above, the mobile terminal needs to first determine whether the mobile terminal is in the cell when using the correction number, and if so, performs the next positioning optimization. Fig. 3 is a logic flow of using GNSS observation and PPP-RTK correction by a mobile terminal, specifically including the following steps:
the mobile terminal receives the GNSS observation value and the SSR correction number;
then, the mobile terminal resolves the SSR correction number to obtain a PPP-RTK positioning result;
then, the mobile terminal judges whether the cell is in the cell;
if so, acquiring enough positioning information and outputting a position verification result; if not, the positioning fails, and the next time of information receiving and resolving is waited.
After the mobile terminal obtains the positioning information and checks, calculates and outputs the positioning information, the mobile terminal can be used on objects (automobiles, unmanned aerial vehicles and the like) with higher speed by considering the quick positioning capability of PPP-RTK.
At this time, the mobile terminal must make the next judgment, that is, judge when the mobile terminal exceeds the current cell and enter another cell.
That is, after determining that the mobile terminal is in the current cell, the mobile terminal further determines whether sufficient information of surrounding cells is currently available, including GEO satellite broadcasting the cell, whether a beam has sufficient cell information, whether a distance to the switching point is sufficient, and the like.
Fig. 4 shows a processing flow after the mobile terminal receives the beam information. When judging whether the received position information is enough, the mobile terminal performs the following 3-layer judgment:
1. whether the current satellite has satellite ID and position;
2. whether the current beam has the matched satellite ID or not and whether the frequency of the beam is within the effective time or not;
3. whether the area (grid) where the current terminal is located can be matched with the beam and the satellite.
After receiving the complete information capable of supporting the above-mentioned 3-layer judgment, the mobile terminal settles accounts at the mobile terminal and judges the current position of the terminal. And then, judging whether to perform beam switching according to the boundary of the cell by combining the information such as the speed, the direction and the like of the current terminal.
Therefore, the correction number broadcasting nesting mechanism provided by the application solves the problem that when a terminal which uses a GNSS observation value and an SSR position correction number for positioning uses a PPP-RTK correction number, inefficient processing switching needs to be performed between grid (cell)/satellite beam/GEO satellites.
The method embodiments of the present invention may be implemented in software, hardware, firmware, etc. Whether the present invention is implemented as software, hardware, or firmware, the instruction code may be stored in any type of computer-accessible memory (e.g., permanent or modifiable, volatile or non-volatile, solid or non-solid, fixed or removable media, etc.). Also, the Memory may be, for example, Programmable Array Logic (PAL), Random Access Memory (RAM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic disk, an optical disk, a Digital Versatile Disk (DVD), and so on.
The second embodiment of the invention relates to a system for supporting the mobile terminal to search and switch satellite signals. The system for supporting the mobile terminal to search and switch the satellite signals is used for executing the method.
This embodiment is a system embodiment corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
It should be noted that, as will be understood by those skilled in the art, the implementation functions of the modules shown in the embodiment of the system for supporting a mobile terminal to perform satellite signal retrieval handover may be understood by referring to the foregoing description of the method for supporting a mobile terminal to perform satellite signal retrieval handover. The functions of the modules shown in the embodiment of the system for supporting the mobile terminal to perform satellite signal search switching can be realized by a program (executable instructions) running on a processor, and can also be realized by a specific logic circuit. The system for supporting the mobile terminal to perform satellite signal search switching according to the embodiment of the present disclosure may also be stored in a computer-readable storage medium if the system is implemented in the form of a software functional module and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present specification may be essentially or partially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present specification. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the present description are not limited to any specific combination of hardware and software.
It is noted that, in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that a certain action is executed according to a certain element, it means that the action is executed according to at least the element, and two cases are included: performing the action based only on the element, and performing the action based on the element and other elements. The expression of multiple, etc. includes 2, and more than 2, more than 2.
All documents mentioned in this application are to be considered as being incorporated in their entirety into the disclosure of this application so as to be subject to modification as necessary. Further, it is understood that various changes or modifications may be made to the present application by those skilled in the art after reading the above disclosure of the present application, and such equivalents are also within the scope of the present application as claimed.
Claims (11)
1. A method for supporting a mobile terminal to perform a satellite signal retrieval handover, comprising:
when the satellite broadcasts the SSR correction number, positioning matching information is synchronously broadcasted, wherein the positioning matching information comprises wave beam information corresponding to each GEO satellite and grid information corresponding to each wave beam, and the grid information comprises longitude and latitude information of a grid;
and the mobile terminal calculates the current position of the mobile terminal according to the received SSR correction number broadcast by the satellite, acquires the current grid where the current position is located, and judges whether the mobile terminal needs to be switched among grids according to the motion speed and the motion direction of the mobile terminal and the received positioning matching information.
2. The method as claimed in claim 1, wherein the longitude and latitude information of the grid comprises a grid longitude and latitude starting point, a step length and a grid angle.
3. The method of claim 1, wherein the step of determining whether the mobile terminal needs to switch between grids comprises the sub-steps of:
acquiring the distance between the current position of the mobile terminal and the boundary of the current grid according to the longitude and latitude information of the current grid;
and pre-judging the pre-judging switching time point when the mobile terminal reaches the boundary of the current grid according to the movement speed and the speed direction of the mobile terminal.
4. The method of claim 3, further comprising:
determining a neighboring mesh closest to the current mesh in the velocity direction; and
and judging whether the current grid and the adjacent grid belong to the same beam.
5. The method of claim 4, wherein the beam information corresponding to each GEO satellite includes a current frequency of each beam of each GEO satellite, an expiration time of the current frequency, a future frequency, and an effective time of the future frequency.
6. The method according to claim 5, wherein said step of determining whether said current mesh and said adjacent mesh belong to the same beam when said current mesh and/or said adjacent mesh belong to multiple beams comprises the sub-steps of:
determining a current beam to which a current frequency adopted by the mobile terminal in the current grid in real time belongs;
and judging whether the current beam is the same as any beam of the adjacent grids.
7. The method of claim 6, wherein when said current grid and said neighboring grid are determined to belong to different beams, said mobile terminal switches beams when leaving said current grid, and determines the frequency of switching according to the current frequency of the beam to which said current grid and said neighboring grid belong, the expiration time of the current frequency, the future frequency, and the effective time of the future frequency.
8. The method of claim 4, wherein when said current mesh and said neighboring mesh are determined to belong to different beams, said method further comprises:
and judging whether the beam to which the current grid belongs and the beam to which the adjacent grid belongs belong to the same GEO satellite.
9. The method as claimed in claim 1, wherein the format of the positioning supporting information includes a header and a message body, and the message body includes a three-layer nested loop, which respectively are: loop 1, loop 2 and loop 3, the three-layer nested loop logic being { loop 1[ loop 2 (loop 3) ] }; wherein, the first and the second end of the pipe are connected with each other,
the cycle 1 is used to traverse all GEO satellites;
the loop 2 is used for traversing all beams corresponding to the satellites in the loop 1;
the loop 3 is used to traverse all grids corresponding to the beams in the loop 2.
10. The method of claim 9, wherein the method comprises the step of enabling the mobile terminal to perform a satellite signal retrieval handover,
the cycle 1 includes: the ID of each GEO satellite and the synchronous orbital position of each GEO satellite;
the cycle 2 comprises: a beam ID corresponding to the satellite, an area covered by the satellite, a current frequency of the current beam, an expiration time of the current frequency, a future frequency and an effective time of the future frequency;
the cycle 3 comprises: the grid ID corresponding to the beam, the area covered by the beam, the longitude and latitude starting point of the grid, the step length and the grid angle.
11. A system for supporting a mobile terminal for satellite signal retrieval handover, characterized by being adapted to perform the method of any of claims 1-10.
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