CN113572515B - Satellite selection method and device - Google Patents
Satellite selection method and device Download PDFInfo
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- CN113572515B CN113572515B CN202110862540.0A CN202110862540A CN113572515B CN 113572515 B CN113572515 B CN 113572515B CN 202110862540 A CN202110862540 A CN 202110862540A CN 113572515 B CN113572515 B CN 113572515B
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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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- 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
- H04B7/18519—Operations control, administration or maintenance
Abstract
The application provides a satellite selection method and a satellite selection device, relates to the technical field of communication, and solves the problems that a terminal is complex in communication satellite selection process and high in calculation intensity. The method comprises the following steps: and acquiring the position of the electronic equipment, and determining a first cone corresponding to the electronic equipment. The vertex position of the first cone is the position of the electronic device, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic device is a preset angle corresponding to the electronic device. Satellite orbit data is determined, and a set of satellites is determined based on the satellite orbit data. And the running position of the satellite in the satellite set at the target time is within the coverage range of the first cone, and the satellite set comprises at least one satellite. And finally, selecting a target satellite from the satellite set according to a preset rule. The embodiment of the application is applied to satellite selection of the terminal.
Description
Technical Field
Embodiments of the present application relate to the field of communications technologies, and in particular, to a satellite selection system.
Background
Low earth orbit satellite (LEO) is widely used in electronic device communication process due to its advantages of low transmission delay and low path loss. However, since the number of low-orbit satellites is large, the electronic device needs to select an accessed low-orbit satellite from a plurality of low-orbit satellites according to its own needs.
Currently, when an electronic device needs to access a low-orbit satellite, the electronic device sends a satellite access request to a server (such as a ground control center server). The server receives satellite ephemeris data according to the satellite access request, then processes the satellite ephemeris data by using a preset algorithm, determines a low-orbit satellite which can be accessed by the current electronic equipment, and then sends the information of the low-orbit satellite to the electronic equipment, so that the electronic equipment realizes satellite access.
It can be seen that, if the electronic device moves out of the communication range of the currently accessed low-orbit satellite or the electronic device needs to access the low-orbit satellite again, the server needs to recalculate the accessible low-orbit satellite of the electronic device, but because the number of low-orbit satellites is large and the data volume of the satellite ephemeris data is large, the power consumption in the calculation process is high, the calculation efficiency is low, and a large time delay is generated in the process of switching the communication satellite by the electronic device, which affects the communication of the electronic device.
Disclosure of Invention
The application provides a satellite selection method and a satellite selection device, and solves the problems that a process of selecting a communication satellite by a terminal is complex and the calculation intensity is high.
In a first aspect, the present application provides a method for satellite selection, the method comprising: and acquiring the position of the electronic equipment, and determining a first cone corresponding to the electronic equipment. The vertex position of the first cone is the position of the electronic device, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic device is a preset angle corresponding to the position of the electronic device. Satellite orbit data is determined, and a set of satellites is determined based on the satellite orbit data. And the running position of the satellite in the satellite set at the target time is within the coverage range of the first cone, and the satellite set comprises at least one satellite. And finally, selecting a target satellite from the satellite set according to a preset rule.
In the above scheme, after the ground control center acquires the position of the electronic device, the first cone corresponding to the electronic device is determined. The range of the first cone is used to represent a communicable range in which the electronic device establishes a communication connection with the satellite at the current position. The ground control center determines satellite orbit data and determines a set of satellites within a communicable range according to the satellite orbit data, and any satellite in the set of satellites can realize electronic equipment communication. And finally, selecting a target satellite from the determined satellite set according to a preset rule. Therefore, the satellite selection process can be simplified, the calculation intensity of determining the satellite set is reduced, and the selection efficiency of target satellite access is improved.
In addition, in some embodiments, the satellite selection method can also be directly applied to the electronic device, and the electronic device can select the accessible target satellite by itself, so that the satellite selection efficiency is further improved.
In a second aspect, the present application provides a satellite selection apparatus, comprising: the device comprises an acquisition module and a processing module. And the acquisition module is used for acquiring the position of the electronic equipment. The processing module is used for determining a first cone corresponding to the electronic device. The vertex position of the first cone is the position of the electronic device, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic device is a preset angle corresponding to the position of the electronic device. And the processing module is also used for determining satellite orbit data. The processing module is further configured to determine a set of satellites based on the satellite trajectory data. And the running position of the satellite in the satellite set at the target time is within the coverage range of the first cone, and the satellite set comprises at least one satellite. The processing module is further used for selecting a target satellite from the satellite set according to a preset rule.
In a third aspect, the present application provides a satellite selection apparatus comprising a processor, which executes computer-executable instructions to cause the satellite selection apparatus to perform the satellite selection method according to the first aspect as described above when the satellite selection apparatus is operated.
In a fourth aspect, the present application provides a computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the satellite selection method as described above in the first aspect.
In a fifth aspect, the present application provides a computer program product comprising instruction code for performing the satellite selection method as described in the first aspect above.
For the beneficial effects of the second aspect, the third aspect, the fourth aspect, the fifth aspect and various implementation manners thereof in the present application, reference may be made to beneficial effect analysis in the first aspect and various implementation manners thereof, and details are not repeated here.
In a sixth aspect, the present application provides a satellite selection system comprising a satellite, a ground control center, and an electronic device. The ground control center is configured to perform the satellite selection method of the first aspect. The electronic equipment is used for receiving the information of the target satellite and accessing the target satellite according to the information of the target satellite. The number of satellites is at least one, and the satellites include a target satellite.
These and other aspects of the present application will be more readily apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 satellite communication system according to an embodiment of the present application;
fig. 2 is a schematic hardware structure diagram of a satellite selection apparatus according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a satellite selection method according to an embodiment of the present application;
fig. 4 is a schematic diagram of a scenario of determining a first cone in a satellite selection method according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a satellite selection device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
For example, fig. 1 is a satellite communication system provided herein. Referring to fig. 1, the satellite communication system includes a satellite 11, a ground control center 12, and an electronic device 13.
Optionally, the satellite communication system includes at least one satellite 11 (e.g., the satellite 1, the satellite 2, the satellite 3, and the satellite 4 shown in fig. 1), and the satellite 11 may include, for example, a low orbit satellite, a medium orbit satellite, and the like, and the embodiment of the present application does not limit any specific type of satellite.
Alternatively, the ground control center 12 may be a device or a server with ephemeris data processing and satellite selection functions, such as a cloud server or a network server. The ground control center 12 may be a global ground control center or a local ground control center, and the ground control center 12 may be one server, a server cluster composed of a plurality of servers, or a cloud computing service center. In the embodiment of the present application, the device implementing the function of the ground control center may be a server, or may be a device (for example, a chip system in the server) supporting the ground control center to implement the function. In some embodiments, the ground control center may also be referred to as a control center, a satellite selection device, a satellite selection server, and the like, which will not be described in detail below.
Alternatively, the electronic device 13 includes, for example, an electronic device capable of realizing communication based on a satellite network. The electronic device 13 may be a fixed-position terminal, a satellite mobile terminal (such as a satellite phone, an iridium mobile phone, etc.) held by a person, a vehicle-mounted mobile terminal (such as a vehicle-mounted satellite phone, etc.), an airborne mobile terminal on an airplane, and any mobile terminal flying in the atmosphere, such as an unmanned aerial vehicle, an airship, a balloon, etc. The embodiment of the present application does not specifically limit the specific form of the electronic device 13. In the embodiment of the present application, the apparatus for implementing the function of the electronic device may be an electronic device, and may also be an apparatus (such as a system on a chip in the electronic device) that supports the electronic device to implement the function.
In some embodiments, the ground control center 12 is capable of establishing a communication connection with the satellite 11 and the electronic device 13. The ground control center 12 has a reliable database and powerful computing resources, and can acquire satellite ephemeris data of the satellites 11 to determine orbit data of the satellites. The ground control center 12 selects an accessed target satellite for the electronic device 13 based on the satellite orbit data, and transmits information of the target satellite to the electronic device 13. For example, as shown in fig. 1, the ground control center 12 determines that the target satellite is the satellite 2, and transmits information of the satellite 2 to the electronic device 13. Accordingly, the electronic device 13 receives the target satellite information. And based on the target satellite information, access the target satellite, such as to establish a communication connection with satellite 2.
In other embodiments, the satellite communication system may include only the satellite 11 and the electronic device 13. The electronic device 13 can acquire ephemeris data of the satellite 11, determine satellite orbit data according to the ephemeris data, perform satellite selection, and determine and access an accessible target satellite.
It should be noted that the term "communication" in the embodiments of the present application may also be described as "data transmission", "information transmission", or "transmission", etc.
In the above satellite communication system, the satellites 11 constitute a space-based system; the ground control center 12 and the electronic device 13 constitute a ground-based system. The space-ground system and the foundation system can work independently and can also be interconnected and intercommunicated, and a space-ground integrated three-dimensional, multi-layer and heterogeneous broadband wireless communication network, namely a space-ground integrated network, is formed by fusing heterogeneous networks. The satellite communication system may be a low orbit satellite communication system or a medium and high orbit satellite communication system.
Compared with a high-orbit earth satellite, the low-orbit satellite has a low orbit height, so that the transmission delay and the path loss of a space-ground integrated network formed by the low-orbit satellite are relatively small, and the method is suitable for an electronic equipment communication scene, but the low-orbit satellite which can be accessed by electronic equipment needs to be selected from a plurality of low-orbit satellites. Because the number of the low-orbit satellites is large, in the process of selecting the access satellites of the electronic equipment, the ground control center needs to process satellite ephemeris data with large data volume, and finally determines the target satellite which can be accessed by the electronic equipment according to the requirements of the electronic equipment. However, because the computing resources of the ground control center are limited, the current ephemeris data processing method with higher precision is not suitable for large-scale low-orbit satellite selection scenes which need to process a large amount of data at high speed.
In view of the above problems, the present application provides a satellite selection method and apparatus, where the satellite selection method specifically includes: after the ground control center obtains the position of the electronic equipment, a first cone corresponding to the electronic equipment is determined. The first cone is the communicable range within which the electronic device establishes a communication connection with the satellite at this location. And the ground control center determines satellite orbit data, determines a satellite set according to the satellite orbit data, and finally determines a target satellite in the satellite set according to a preset rule. Therefore, the calculation intensity of determining the satellite set can be reduced, and the satellite access efficiency is improved.
The satellite selection method provided by the embodiment of the application is applicable to the satellite communication system shown in fig. 1, and both the ground control center 12 and the electronic device 13 in fig. 1 belong to a satellite selection device. In a specific implementation, the satellite selection device has the components shown in fig. 2. Fig. 2 is a satellite selection apparatus provided in an embodiment of the present application, and the satellite selection apparatus may include at least one processor 202, where the processor 202 is configured to execute application program codes, so as to implement a satellite selection method in the present application.
The processor 202 may be a Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
As shown in fig. 2, the satellite selection device may further include a memory 203. The memory 203 is used for storing application program codes for executing the scheme of the application, and the processor 202 controls the execution.
The memory 203 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 203 may be self-contained and coupled to the processor 202 via the bus 204. The memory 203 may also be integrated with the processor 202.
As shown in fig. 2, the satellite selection apparatus may further comprise a communication interface 201, wherein the communication interface 201, the processor 202, and the memory 203 may be coupled to each other, for example, via a bus 204. The communication interface 201 is used for information interaction with other devices, for example, information interaction of the satellite selection device with other devices is supported.
It is noted that the device structure shown in fig. 2 does not constitute a limitation of the satellite selection means, which may comprise more or less components than those shown in fig. 2, or a combination of some components, or a different arrangement of components than those shown in fig. 2.
The satellite selection method provided by the embodiment of the present application is described below with reference to fig. 3, in conjunction with the satellite communication system shown in fig. 1 and the satellite selection apparatus shown in fig. 2.
Fig. 3 is a flowchart illustrating a satellite selection method according to an embodiment of the present disclosure. Referring to fig. 3, the satellite selection method includes the following steps.
S301, the ground control center acquires the position of the electronic equipment.
In some embodiments, the electronic device sends a satellite access request signal to the ground control center when it needs to access the satellite, where the satellite access request signal carries the electronic device location. Or, the ground control center monitors the position of the electronic equipment, and executes the steps S301 to S305 when determining that the electronic equipment needs to reselect to access the satellite.
In some embodiments, the electronic device location is determined according to a positioning method such as Global Positioning System (GPS) or BeiDou satellite navigation system (BDS).
S302, the ground control center determines a first cone corresponding to the electronic equipment.
The vertex position of the first cone is the position of the electronic device, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic device is a preset angle corresponding to the electronic device. The preset angle can be determined according to conditions such as the position of the electronic device, the environment, the empirical value, the communication capability of the electronic device and the like, and the preset angle is used for representing the minimum included angle at which the position of the electronic device can be in direct communication with the satellite in the sky. For example, the position of the electronic device is a position in a desert, and the ground control center determines the preset angle to be 10 ° according to the environment where the electronic device is located by using empirical values, so as to establish the first cone. Further, the first conical range is a communicable range in which the electronic device can establish a communication connection with the satellite.
In some embodiments, the satellite moves around the earth along a predetermined orbit, and if the satellite moves out of the communicable range of the electronic device, the satellite cannot establish a communication connection with the electronic device. Therefore, the ground control center needs to determine a communicable range of the electronic device, and then determine a set of satellites within the communicable range through the following step S304.
In some embodiments, after acquiring the position of the electronic device, the ground control center determines a corresponding preset angle according to the position of the electronic device, and then determines a communicable range of the electronic device based on the preset angle, that is, determines the first cone.
For example, fig. 4 shows a communicable range of an electronic device according to an embodiment of the present application, as shown in fig. 4, a ground control center determines an angle of a preset angle 401 as α according to a position 404 of the electronic device, and creates at least one radial line 402 in a sky direction based on the preset angle 401 with the position of the electronic device as a vertex, so as to obtain a first cone 403. The first cone 403 covers a communication range in which the electronic device can establish a communication connection with a satellite. Wherein, the alpha is more than 0 degree and less than 90 degrees.
In the embodiments of the present application, the communicable range of the electronic device is represented by the coverage of a cone. It is to be understood that the communicable range may be expressed by other shapes such as a pyramid, and this is not particularly limited in the embodiment of the present application.
In some embodiments, the ground control center can obtain ephemeris data from which satellite orbital altitude can be determined, and the highest orbital altitude can be set as the cone altitude. Alternatively, the cone height is not limited. The determination of the first cone reduces the computational intensity of the computing electronics in selecting the communicating target satellite, thereby improving the selection efficiency.
And S303, determining satellite orbit data by the ground control center.
In some embodiments, a satellite tracking station (such as North American airbus department) can monitor satellite activity and determine ephemeris data for the satellites. And the ground control center acquires ephemeris data from the satellite tracking station, analyzes the ephemeris data by using a preset algorithm and determines the orbit data of the satellite. The orbit data comprises satellite orbit information, a satellite operation period, satellite operation time and a satellite operation position. The preset algorithm may refer to the prior art, and the embodiment of the present application is not specifically described.
In some embodiments, the ground control center processes the parsed ephemeris data according to a preset rule to obtain satellite orbit data including a new satellite number. Specifically, the satellites operate in the same or different orbits, the planes formed by the orbits are called orbital planes, and the heights of the satellites in the same orbit are the same as the period of the earth around the orbit. The satellite orbit information includes, for example, orbit plane information of the satellite operation, and the orbit planes of the satellite operation are renumbered as P1, P2 to PN according to a preset rule. Based on this, each satellite on each orbit plane is renumbered according to preset rules, for example, the P1 orbit plane is P1.S1, P1.S2 to P1.Sm1, and the P2 orbit plane is P2.S1, P2.S2 to P2.Sm2, until the PN orbit plane is pn.s1, pn.s2 to pn.smn. The satellite operation period is used for representing the orbit period of the satellite on each orbit, and the preset rule renumbers the satellite operation period as T1, T2 to TN. The satellite operation time and the satellite operation position are used for indicating that the satellite operates at a preset position at a preset time. For example, based on the satellite's operating time, the satellite's operating position, and the satellite's operating period (e.g., T), it may be determined that the satellite is located at position B at time a and both are located at position B at time (a + T). Wherein, P, M and N are integers.
In some embodiments, the ground control center obtains the satellite orbit data after resolving and renumbering the ephemeris data according to a preset rule. Subsequently, when the electronic device needs to perform satellite selection again or other electronic devices need to perform satellite selection, the ground control center can use the satellite orbit data to perform satellite selection. Namely, satellite ephemeris data does not need to be received and analyzed again, and the calculation amount is reduced. For example, when the electronic device needs to perform satellite selection again, the ground control center can perform satellite selection again for the electronic device by using the satellite orbit data that has been determined last time.
Furthermore, the ground control center can preset an updating period and periodically update the satellite orbit data, so that the satellite orbit data cannot be updated in time when the perturbation influences the satellite position or a new satellite appears. Or after determining that the satellite ephemeris data is updated, the ground control center updates the satellite orbit data. The perturbation is caused by the fact that the environment of the satellite is not in an absolute vacuum state, a medium still exists, and the satellite position can fall under the action of the universal gravitation, but the satellite can be reset by a booster of the satellite. In this process, the actual satellite orbit data may change, and the electronic device needs to select a different satellite again for communication, so that the satellite orbit data needs to be updated periodically.
Therefore, the ground control center does not need to process ephemeris data in each satellite selection process, the ephemeris data processing frequency is reduced, and the satellite selection efficiency is improved. And the calculation intensity of the ground control center in the satellite selection process can be effectively reduced, and the power consumption is reduced.
And S304, the ground control center determines a satellite set according to the satellite orbit data.
In some embodiments, the ground control center determines an orbital plane in the sky that intersects the first cone based on the satellite orbital data and obtains orbital data for all satellites in the orbital plane. Wherein all satellites on the orbital plane are satellites that the electronic device may communicate with.
Illustratively, the orbital planes in the sky that intersect the first cone are PI1, PI2 through PIX, and all satellites in each orbital plane are satellites with which the electronic device may communicate directly. The set of satellites with which the electronic device may communicate directly therefore comprises satellites with satellite numbers PI1.S1, PI1.S2 to PI1.Si1 in the PI1 orbital plane, satellites with satellite numbers PI2.S1, PI2.S2 to PI2.Si2 in the PI2 orbital plane, up to satellites with satellite numbers PIX. S1, PIX. S2 to PIX. Si in the PIX orbital plane. Wherein, I and X are integers.
In some embodiments, the ground control center calculates a first time for the satellite to travel into the first cone of range and a second time for the satellite to travel out of the first cone of range based on the satellite orbit data, and determines a set of satellites having a target time travel position within the first cone of range based on the first time and the second time. The target time is the time when the electronic equipment needs to access the satellite.
The first time is a starting time point, denoted as t.enter, at which a satellite in the satellite set enters the coverage of the first cone and can directly establish a communication connection with the electronic device, and the second time point is an ending time point, denoted as t.exit, at which the satellite leaves the coverage of the first cone and can directly establish a communication connection with the electronic device. In the embodiment of the present application, it is preset that the satellite operation state is stable and the period is constant, so that the starting time point of the satellite PI1.S1 on the orbital plane PI1 entering the first cone can be denoted as PI1.S1.T.enter + n × T1, and the ending time point of the satellite PI1.S1.T.exit + n × T1, where n is a natural number. Based on this, the set of directly communicable satellites of the electronic device at a certain time point t (i.e., the target time) is S = { S | pix.sy.t.enter + n × Tx ≦ t ≦ pix.sy.t.exit + n × Tx }. Wherein x is the number of the orbit and y is the number of the satellite in the orbit.
For example, assuming that the satellite PI1.S1 on the orbital plane PI1 runs into the first cone coverage for a first time of 7, 00, and runs out of the first cone coverage for a second time of 9, 00, the target time is 8. The ground control center determines that the satellite PI1.S1 operates within the communicable range of the electronic device when the ratio of 8.
It should be noted that the embodiments of the present application do not limit the order in which the ground control center obtains the electronic device position and determines the satellite trajectory data. I.e. without limiting the order of the above-mentioned steps S301-S303. For example, the ground control center may determine satellite trajectory data before acquiring the electronic device location when satellite selection is required. For another example, after acquiring the position of the electronic device, the ground control center determines that satellite selection is required, and then determines satellite orbit data.
S305, the ground control center selects a target satellite from the satellite set according to a preset rule.
In some embodiments, after the ground control center determines the set of satellites, a target satellite is selected from the set of satellites according to a preset rule. The preset rules comprise one or more of the following rules A, B and C.
A. The time interval between the time to travel out of the coverage of the first cone and the target time is greater than or equal to a time threshold.
In some embodiments, in order to avoid frequent switching of the access satellite by the electronic device, a satellite capable of ensuring a long connection time should be selected as the target satellite in the satellite selection process. Therefore, a time threshold value can be preset, and satellites in the satellite set with connection duration greater than or equal to the time threshold value are determined as target satellites. Wherein the time threshold may be determined from experimental data or empirical values.
For example, the ground control center determines connection durations of all satellites in the satellite set according to the satellite orbit data, and determines the satellite with the longest connection duration as the target satellite. The connection duration is used to indicate a duration during which a communication connection with the electronic device can be established within a communicable range of the electronic device.
In some embodiments, the set of directly communicable satellites of the electronic device at a certain time t is S = { S | pix.sy.t.enter + n × Tx ≦ t ≦ pix.sy.t.exit + n × Tx }, where n is a natural number, x is an orbit number, and y is a satellite number in the orbit. And according to the preset rule A, selecting one satellite with the largest PIx.Sy.T.exit + n x Tx-t in the satellite set for communication.
For example, assuming that the first time for the satellite PI1.S1 on the orbital plane PI1 to travel into the first cone coverage is 7, 00, and the second time for the satellite to travel out of the first cone coverage is 9; the first time for the satellite p1.S2 on the orbital plane PI1 to travel into the first cone coverage is 7, 00, and the second time to travel out of the first cone coverage is 22. The target time is 8. And, the communication time length of the electronic equipment and the satellite PI1.S1 is determined to be 1 hour, and the communication time length of the electronic equipment and the satellite PI1.S2 is determined to be 14 hours. The ground control center determines that the communicable time period with the satellite pi1.S2 is longer than the communicable time period with the satellite pi1.S1, and thus determines that the target satellite is the satellite pi1.S2.
B. The distance from the electronic device is less than or equal to a distance threshold.
In some embodiments, the greater the electronic device is located from the satellite, the greater the signal transmission delay. Therefore, for some electronic devices with higher delay requirements, the ground control center should select a satellite in the satellite set, which is less than or equal to a distance threshold from the electronic device, as the target satellite. Or selecting a satellite with the time delay smaller than or equal to the time delay threshold value in the satellite set as the target satellite. The distance threshold or the time delay threshold may be determined according to experimental data or empirical values.
For example, the ground control center determines distances between all satellites in the set of satellites and the electronic device at the target time according to the satellite orbit data, and determines the satellite with the smallest distance as the target satellite.
C. The bandwidth is greater than or equal to a bandwidth threshold.
In some embodiments, the bandwidth of the satellite affects the stability of the communication during the satellite selection process. Therefore, for some electronic devices with higher communication quality requirements, the ground control center should select a satellite in the satellite set that can provide a larger bandwidth as the target satellite. The bandwidth threshold may be determined based on experimental data or empirical values.
For example, the ground control center determines the available bandwidth of all satellites in the satellite set according to the satellite orbit data, and determines the satellite which can provide the maximum bandwidth as the target satellite.
In some scenarios, after determining the target satellite, the ground control center needs to send information of the target satellite to the corresponding electronic device, so that the electronic device is accessed to the target satellite. Optionally, as shown in fig. 3, after the step S305, a step S306 may be further included.
S306, the ground control center sends the information of the target satellite to the electronic equipment.
And the information is used for indicating the electronic equipment to access the target satellite according to the information. The information of the satellite includes, for example, a satellite number.
In some embodiments, after the ground control center determines a target satellite to which the electronic device is finally connected according to different requirements of the electronic device by different preset rules, information of the target satellite is sent to the electronic device. Correspondingly, the electronic equipment receives the information of the target satellite and accesses the target satellite according to the information of the target satellite.
According to the scheme, the satellite is set to run in a stable state in advance, and when the electronic equipment moves to different positions or the moving distance exceeds the preset distance, the ground control center recalculates the information of the target satellite selected by the electronic equipment for communication. However, instead of performing the step of the terrestrial control center re-receiving the ephemeris data and analyzing the ephemeris data to obtain the satellite orbit data in S303, the terrestrial control center may obtain the previously determined satellite orbit data and use the satellite orbit data as it is.
In some embodiments, the satellites that the electronic device selects to communicate with will change when perturbation conditions cause the satellite positions to drift, which is corrected periodically or aperiodically by the ground control center. The correction is to acquire the latest orbit data, recalculate the target satellite information selected by the electronic equipment for communication and send the target satellite information to the electronic equipment.
In the above scheme, after the ground control center acquires the position of the electronic device, the first cone corresponding to the electronic device is determined. The first cone is the communicable range over which the electronic device establishes a communication connection with the satellite at this location. And the ground control center determines satellite orbit data, determines a satellite set according to the satellite orbit data, and finally selects a target satellite according to a preset rule. The complexity of the calculation process of determining the target satellite by the ground control center is reduced, and meanwhile, under the condition that the number of satellites is large, the satellite selection range of communication connection established between the electronic equipment and the satellites is narrowed, so that the calculation intensity of determining the satellite set can be reduced, and the satellite access efficiency is improved.
In some scenarios, the electronic device may also utilize its own computing capabilities for satellite selection, i.e., the electronic device may also directly perform steps S301-S305 described above.
Therefore, the complexity of the calculation process of the electronic equipment for determining the target satellite is reduced, and meanwhile, the satellite selection range of the electronic equipment for establishing communication connection with the satellite is narrowed under the condition that the number of the satellites is large. Therefore, the computing intensity for determining the satellite set can be reduced, the consumption of the memory of the electronic equipment is further reduced, and the satellite access efficiency is improved. Furthermore, the electronic equipment utilizes the self computing capability to select the satellite, does not need to send a satellite access request signal to the control center and receive a satellite selection result of the ground control center, and can further improve the satellite selection efficiency.
In the embodiment of the present application, the functional modules of the satellite selection device may be divided according to the method embodiments, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
The method provided by the embodiment of the present application is described in detail above with reference to fig. 3. Hereinafter, a satellite selection device according to an embodiment of the present application will be described in detail with reference to fig. 5. It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment, and therefore, for the sake of brevity, details which are not described in detail above may be referred to the method embodiment.
The embodiment of the application provides a satellite selection device, which can be the ground control center or a chip or a functional module of the ground control center. Or, it may also be an electronic device or a chip or a functional module of an electronic device. For example, taking the satellite selection device as the ground control center in the above method embodiment as an example, the satellite selection device may implement the steps or processes executed by the ground control center corresponding to the above method embodiment. Alternatively, taking the satellite selection apparatus as the electronic device in the foregoing method embodiment as an example, the satellite selection apparatus may implement the steps or processes executed by the electronic device in the foregoing method embodiment.
Fig. 5 shows a schematic structural diagram of a satellite selection device. The satellite selection means comprises an acquisition module 501 and a processing module 502.
The obtaining module 501 is configured to obtain a location of an electronic device. For example, referring to fig. 3, the obtaining module 501 is configured to execute S301. The processing module 502 is configured to determine a first cone corresponding to the electronic device according to the position of the electronic device acquired by the acquisition module 501; also for determining satellite trajectory data; the satellite tracking system is also used for determining a satellite set according to the satellite orbit data; and the target satellite is selected from the satellite set according to a preset rule. For example, referring to fig. 3, the processing module 502 is configured to execute S302, S303, S304, and S305.
Optionally, the obtaining module 501 is further configured to receive satellite ephemeris data.
Optionally, the processing module 502 is further configured to determine satellite orbit data according to the satellite ephemeris data.
Optionally, the satellite trajectory data includes one or more of the following: satellite orbit information, satellite operation cycle, satellite operation time, and satellite operation position.
Optionally, the processing module 502 is further configured to determine, by the ground control center, a first time when the satellite enters the coverage of the first cone and a second time when the satellite exits the coverage of the first cone according to the satellite orbit data. And determining a set of satellites having a travel location within the first cone at the target time based on the first time and the second time.
Optionally, the preset rule includes one or more of the following: the time interval between the time of running out of the coverage of the first cone and the target time is greater than or equal to a time threshold; the distance between the electronic equipment and the electronic equipment is less than or equal to a distance threshold value; the bandwidth is greater than or equal to a bandwidth threshold.
Optionally, the satellite selecting apparatus further includes a sending module 503, configured to send information of the target satellite to the electronic device, where the information is used to instruct the electronic device to access the target satellite according to the information.
The obtaining module 501 and the sending module 503 may also be implemented as a transceiver module in combination, may be implemented by a transceiver or a transceiver-related circuit component, and may be a transceiver or a transceiver unit.
Another embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored, and when the instructions are executed on a satellite selection device, the satellite selection device performs the steps of the ground control center in the satellite selection method according to the embodiment shown in fig. 3.
In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the processor of the satellite selection device may read the computer-executable instructions from the computer-readable storage medium, and the processor executes the computer-executable instructions to cause the satellite selection device to perform the steps of the ground control center in the satellite selection method according to the embodiment shown in fig. 3.
Another embodiment of the present application further provides a computer-readable storage medium, which stores instructions that, when executed on a satellite selection apparatus, perform the steps of the electronic device in the satellite selection method according to the embodiment shown in fig. 3.
In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium. The processor of the satellite selection apparatus may read the computer-executable instructions from the computer-readable storage medium, and the processor executes the computer-executable instructions to cause the satellite selection apparatus to perform the steps of the electronic device in the satellite selection method according to the embodiment shown in fig. 3.
In another embodiment of the present application, there is also provided a satellite selection system comprising a low-orbit satellite, a ground control center, and at least one electronic device. A ground control center for performing the steps of the ground control center in the satellite selection method according to the embodiment shown in fig. 3. Wherein, at least one electronic device.
All relevant contents of the steps related to the above method embodiments may be referred to the functional description of the corresponding functional module, and the functions thereof are not described herein again.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the 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 application.
Those of ordinary skill in the art would appreciate that the various illustrative modules, elements, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, e.g., multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied 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 steps of the method according to the embodiments of the present application. 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 Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (14)
1. A method for satellite selection, comprising:
acquiring the position of the electronic equipment;
determining a first cone corresponding to the electronic equipment; the vertex position of the first cone is the position of the electronic equipment, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic equipment is a preset angle corresponding to the electronic equipment;
determining satellite orbit data;
determining an orbital plane intersecting the first cone based on the satellite orbit data;
determining a satellite set according to satellite orbit data of an orbit plane having an intersection with the first cone; the operating positions of the satellites in the set of satellites at the target time are within the coverage of the first cone, and the set of satellites comprises at least one satellite;
and selecting a target satellite from the satellite set according to a preset rule.
2. The satellite selection method of claim 1, wherein the determining satellite trajectory data comprises:
receiving satellite ephemeris data;
and determining the satellite orbit data according to the satellite ephemeris data.
3. The satellite selection method of claim 2, wherein the satellite trajectory data comprises one or more of: satellite orbit information, satellite operation cycle, satellite operation time, and satellite operation position.
4. A method for satellite selection according to any of claims 1-3, wherein said determining a set of satellites from said satellite trajectory data comprises:
determining a first time for a satellite to travel into the coverage of the first cone and a second time for a satellite to travel out of the coverage of the first cone based on the satellite orbit data;
determining a set of satellites having a travel location within the range of the first cone at the target time based on the first time and the second time.
5. The satellite selection method according to claim 1, wherein the preset rule comprises one or more of the following: the time interval between the time of running out of the coverage of the first cone and the target time is greater than or equal to a time threshold; the distance from the electronic device is less than or equal to a distance threshold; the bandwidth is greater than or equal to a bandwidth threshold.
6. The method of satellite selection according to claim 1, further comprising:
and sending information of the target satellite to the electronic equipment, wherein the information is used for indicating the electronic equipment to access the target satellite according to the information.
7. A satellite selection apparatus, comprising: the device comprises an acquisition module and a processing module;
the acquisition module is used for acquiring the position of the electronic equipment;
the processing module is used for determining a first cone corresponding to the electronic equipment; the vertex position of the first cone is the position of the electronic equipment, and the included angle between the conical surface of the first cone and the horizontal plane corresponding to the position of the electronic equipment is a preset angle corresponding to the electronic equipment;
the processing module is further used for determining satellite orbit data;
the processing module is further configured to determine an orbital plane intersecting the first cone according to the satellite orbit data;
the processing module is further configured to determine a satellite set according to satellite orbit data of an orbit plane having an intersection with the first cone; the operating positions of the satellites in the set of satellites at the target time are within the coverage of the first cone, and the set of satellites comprises at least one satellite;
the processing module is further configured to select a target satellite from the satellite set according to a preset rule.
8. The satellite selection apparatus of claim 7,
the acquisition module is further used for receiving satellite ephemeris data;
the processing module is further configured to determine the satellite trajectory data according to the satellite ephemeris data.
9. The satellite selection apparatus of claim 8, wherein the satellite trajectory data comprises one or more of: satellite orbit information, satellite operation cycle, satellite operation time, and satellite operation position.
10. The satellite selection apparatus according to any one of claims 7 to 9, wherein the processing module is specifically configured to:
determining a first time for a satellite to travel into the coverage of the first cone and a second time for a satellite to travel out of the coverage of the first cone based on the satellite orbit data;
determining a set of satellites having a travel location within the range of the first cone at the target time based on the first time and the second time.
11. The satellite selection device of claim 7, wherein the preset rules comprise one or more of the following: the time interval between the time of running out of the coverage of the first cone and the target time is greater than or equal to a time threshold; the distance from the electronic device is less than or equal to a distance threshold; the bandwidth is greater than or equal to a bandwidth threshold.
12. The satellite selection apparatus of claim 7, further comprising a transmission module,
the sending module is configured to send information of the target satellite to the electronic device, where the information is used to instruct the electronic device to access the target satellite according to the information.
13. A satellite selection apparatus comprising a processor that executes computer-executable instructions to cause the satellite selection apparatus to perform the satellite selection method of any one of claims 1-6 when the satellite selection apparatus is in operation.
14. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the satellite selection method of any one of claims 1-6.
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