Terminal access and handover management method for low earth orbit constellation system in complex environment

Abstract

The present application relates to a kind of low-orbit constellation system terminal access and switching management method under complex environment, comprising the following steps: step S1, terminal position data is acquired using GNSS receiver;Step S2, relevant occlusion data on the position of terminal is obtained using image measuring instrument in azimuth and pitch;Step S3, ground station sends switching instruction to corresponding satellite and terminal based on terminal position data, occlusion data at corresponding time.The present application improves the environment situation awareness capability of ground station side to terminal side, and then optimizes terminal wireless access resource allocation, enhances terminal access success rate under complex environment, enhances system switching success rate under complex environment, reduces the complexity of terminal access under complex environment, is convenient for engineering implementation, simple and efficient, and practical.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, specifically to a method for terminal access and handover management in a low-Earth orbit constellation system under complex environments. Background Technology

[0002] Traditional terrestrial mobile communication terminals and traditional satellite communication terminals differ greatly in terms of terminal form, antenna type, and wireless communication scenarios. Therefore, ensuring the access and switching performance of user terminals in complex environments is a key aspect of further enhancing the resilience of low-orbit satellite internet and the survivability of satellite internet terminals. Summary of the Invention

[0003] In view of the above-mentioned technical problems, this invention proposes a method for terminal access and handover management in low-Earth orbit constellation systems under complex environments, which improves the success rate of terminal access and handover in complex environments.

[0004] The technical solution to achieve the purpose of this invention is: a method for terminal access and handover management in a low-Earth orbit constellation system under complex environments, comprising the following steps:

[0005] Step S1: Use a GNSS receiver to acquire terminal location data;

[0006] Step S2: Use an image measuring instrument to obtain occlusion data in the azimuth and elevation of the terminal's location;

[0007] Step S3: The ground station sends a handover command to the corresponding satellite and terminal at the corresponding time based on the terminal location data and obstruction data.

[0008] According to one aspect of the present invention, step S3 specifically includes:

[0009] Step S31: The terminal performs initial antenna beam alignment and satellite search operations based on ephemeris data, terminal location data, and obstruction data obtained in step S2, until it receives a broadcast message from the satellite.

[0010] Step S32: The terminal reports its location data and obstruction data to the ground station. Based on the terminal location data and obstruction data, the ground station sends a handover command to the corresponding satellite and terminal at the corresponding time.

[0011] According to one aspect of the present invention, in step S31, the initial antenna beam alignment and satellite search operation is performed, specifically including:

[0012] Step S311: Receive broadcast messages from the satellite with the highest elevation angle among the currently unobstructed satellites;

[0013] Step S312: Determine if a broadcast message is being sent in the direction of the maximum elevation angle;

[0014] Step S313: If not, remove the corresponding satellite data and then proceed to step S301; if yes, proceed to step S32.

[0015] According to one aspect of the present invention, step S32 specifically includes:

[0016] Step S321: After receiving the broadcast message, the terminal sends a random access request to the corresponding satellite and reports the terminal location data and obstruction data.

[0017] Step S322: The ground station performs visible satellite and communication window prediction calculations based on satellite ephemeris data, terminal location data, and obstruction data in the constellation system.

[0018] Step S323: Based on the communication window forecast and the availability of beam resources in the constellation system, the ground station performs terminal access satellite, satellite switching, access window calculation and planning, and sends switching instructions to the corresponding satellites and terminals at the corresponding times;

[0019] Step S324: The terminal and satellite initiate beam pointing synchronization adjustment and channel switching operations at the corresponding times.

[0020] According to one aspect of the invention, the ephemeris data is ephemeris data pre-stored in the terminal or ephemeris data imported from outside.

[0021] According to one aspect of the present invention, step S2 specifically includes:

[0022] After the terminal is powered on, the image measurement instrument is started. Through measurement, modeling, and field of view analysis, the occlusion data in the azimuth and elevation of the terminal's location is obtained.

[0023] According to the concept of this invention, a method for terminal access and handover management in low-Earth orbit constellation systems under complex environments is proposed. By configuring a GNSS receiver and an image measuring instrument on the terminal side, the terminal is equipped with the ability to perceive its own position and the environment it is in, and reports this information to the ground station side. This improves the ground station side's environmental situational awareness of the terminal side, thereby optimizing the allocation of terminal wireless access resources, enhancing the terminal access success rate in complex environments, improving the system handover success rate in complex environments, reducing the complexity of terminal access in complex environments, facilitating engineering implementation, and being simple, efficient, and highly practical. Attached Figure Description

[0024] Figure 1 A flowchart illustrating a method for terminal access and handover management in a complex environment for a low-Earth orbit constellation system according to an embodiment of the present invention;

[0025] Figure 2This is a schematic diagram illustrating wireless link obstruction in a complex environment according to an embodiment of the present invention.

[0026] Figure 3 The flowchart illustrates a method for managing the access and handover of low-Earth orbit constellation terminals in a complex environment according to another embodiment of the present invention. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0029] like Figures 1 to 3 As shown, the present invention provides a method for terminal access and handover management in a low-Earth orbit constellation system under complex environments, comprising the following steps:

[0030] Step S1: Use a GNSS receiver to acquire terminal location data;

[0031] Step S2: Use an image measuring instrument to obtain occlusion data in the azimuth and elevation of the terminal's location;

[0032] Step S3: The ground station sends a handover command to the corresponding satellite and terminal at the corresponding time based on the terminal location data and obstruction data.

[0033] In this embodiment, by configuring a GNSS receiver and an image measuring instrument on the terminal side, the terminal is equipped with the ability to perceive its own position and the environment it is in, and reports this information to the ground station side. This improves the ground station side's environmental situation awareness of the terminal side, thereby optimizing the allocation of wireless access resources for the terminal, enhancing the success rate of terminal access in complex environments, enhancing the success rate of system handover in complex environments, reducing the complexity of terminal access in complex environments, facilitating engineering implementation, and being simple, efficient, and highly practical.

[0034] Specifically, after the terminal is turned on, the GNSS receiver acquires the terminal's location data, and the image measuring instrument acquires the occlusion data in the azimuth and elevation of the terminal's location through measurement, modeling, and field of view analysis. After the terminal connects to any satellite, it sends the terminal's location data and occlusion data to the ground station, which then sends a handover command to the corresponding satellite and terminal at the appropriate time to complete the terminal access and handover.

[0035] Among them, the image measuring instrument can be Hi-Target's RTK imaging series products: Beidou Hi-Target, Huaxing and iRTK, etc.

[0036] In one embodiment of the present invention, preferably, step S3 specifically includes:

[0037] Step S31: The terminal performs initial antenna beam alignment and satellite search operations based on ephemeris data, terminal location data, and obstruction data obtained in step S2, until it receives a broadcast message from the satellite.

[0038] Step S32: The terminal reports its location data and obstruction data to the ground station. Based on the terminal location data and obstruction data, the ground station sends a handover command to the corresponding satellite and terminal at the corresponding time.

[0039] In this embodiment, the terminal needs to connect to any satellite in the constellation system. After the connection is established, the terminal's location data and the occlusion data of the terminal's location are sent to the ground station via the satellite. The ground station performs corresponding calculations based on the terminal's location data and the corresponding occlusion data to obtain the terminal connection and the optimal satellite, thereby completing the access and switching between the terminal and the satellite.

[0040] In one embodiment of the present invention, preferably, in step S31, the initial antenna beam alignment and satellite search operation is performed, specifically including:

[0041] Step S311: Receive broadcast messages from the satellite with the highest elevation angle among the currently unobstructed satellites;

[0042] Step S312: Determine if a broadcast message is being sent in the direction of the maximum elevation angle;

[0043] Step S313: If not, remove the corresponding satellite data and then proceed to step S301; if yes, proceed to step S32.

[0044] In this embodiment, a constellation system contains multiple satellites. After determining the terminal's location, a set of satellites that the terminal can connect to without obstruction is identified. The satellite with the highest elevation angle in this set is selected for receiving broadcast messages. Since any satellite may fail to connect, it is necessary to determine whether a broadcast message is being sent in the direction of the highest elevation angle, i.e., whether the satellite with the highest elevation angle can be connected. If it can be connected, the terminal transmits its location data and obstruction data to the ground station via that satellite. If it cannot be connected, the satellite is removed from the satellite set. The updated satellite set is then identified, and the satellite with the highest elevation angle in the updated set is connected again. This process continues until the terminal's location data and obstruction data are successfully transmitted to the ground station.

[0045] In one embodiment of the present invention, preferably, step S32 specifically includes:

[0046] Step S321: After receiving the broadcast message, the terminal sends a random access request to the corresponding satellite and reports the terminal location data and obstruction data.

[0047] Step S322: The ground station performs visible satellite and communication window prediction calculations based on satellite ephemeris data, terminal location data, and obstruction data in the constellation system.

[0048] Step S323: Based on the communication window forecast and the availability of beam resources in the constellation system, the ground station performs terminal access satellite, satellite switching, access window calculation and planning, and sends switching instructions to the corresponding satellites and terminals at the corresponding times;

[0049] Step S324: The terminal and satellite initiate beam pointing synchronization adjustment and channel switching operations at the corresponding times.

[0050] In one embodiment of the present invention, preferably, the ephemeris data is ephemeris data pre-stored in the terminal or ephemeris data imported from outside.

[0051] In one embodiment of the present invention, preferably, step S2 specifically includes:

[0052] After the terminal is powered on, the image measurement instrument is started. Through measurement, modeling, and field of view analysis, the occlusion data in the azimuth and elevation of the terminal's location is obtained.

[0053] The present invention discloses a method for terminal access and handover management in a low-Earth orbit constellation system under complex environments. The overall process is as follows: First, the terminal obtains the current time and geographical location information through a configured GNSS receiver. Then, the terminal obtains the occlusion data at the relevant azimuth and elevation angles at its location through a configured image measuring instrument. Based on the actual occlusion situation at the azimuth and elevation angles and historical ephemeris data, the terminal performs satellite search operations until it receives broadcast information. After satellite search is completed, the terminal reports the terminal position, azimuth and elevation constraint occlusion information. Then, the ground station predicts visible satellites and communication windows based on ephemeris data, terminal position information, and azimuth and elevation information. Then, the ground station calculates and plans the terminal access satellites, handover satellites, and access windows based on the communication window prediction and beam resource conditions. Finally, the terminal and the satellite initiate beam pointing synchronization adjustment and channel handover operations at the corresponding times.

[0054] In summary, this invention proposes a terminal access and handover management method for a low-Earth orbit constellation system in complex environments, comprising the following steps: Step S1, acquiring terminal location data using a GNSS receiver; Step S2, acquiring occlusion data in azimuth and elevation at the terminal's location using an image measuring instrument; Step S3, the ground station sending handover commands to the corresponding satellites and the terminal at the appropriate time based on the terminal location data and occlusion data. This invention, by configuring a GNSS receiver and an image measuring instrument on the terminal side, enables the terminal to perceive its own location and surrounding environment and report this information to the ground station, improving the ground station's environmental situational awareness of the terminal side. This optimizes the allocation of wireless access resources for the terminal, enhances the terminal access success rate in complex environments, improves the system handover success rate in complex environments, reduces the complexity of terminal access in complex environments, facilitates engineering implementation, is simple and efficient, and has strong practicality.

[0055] It should also be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0056] Finally, it should be noted that the above description represents a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make various improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for terminal access and handover management in a low-Earth orbit constellation system under complex environments, comprising the following steps: Step S1: Use a GNSS receiver to acquire terminal location data; Step S2: Use an image measuring instrument to obtain occlusion data in the azimuth and elevation of the terminal's location; Step S3: Based on the terminal location data and obstruction data, the ground station sends a handover command to the corresponding satellite and terminal at the appropriate time, specifically including: Step S31: The terminal performs initial antenna beam alignment and satellite search operations based on ephemeris data, terminal location data, and obstruction data obtained in step S2, until it receives a broadcast message from the satellite. Step S32: The terminal reports its location data and obstruction data to the ground station. Based on the terminal location data and obstruction data, the ground station sends handover instructions to the corresponding satellites and terminals at the appropriate time, specifically including: Step S321: After receiving the broadcast message, the terminal sends a random access request to the corresponding satellite and reports the terminal location data and obstruction data. Step S322: The ground station performs visible satellite and communication window prediction calculations based on satellite ephemeris data, terminal location data, and obstruction data in the constellation system. Step S323: Based on the communication window forecast, the availability of beam resources in the constellation system, and the obstruction data, the ground station performs terminal access satellite, satellite switching, access window calculation and planning, and sends switching instructions to the corresponding satellites and terminals at the corresponding times. Step S324: The terminal and satellite initiate beam pointing synchronization adjustment and channel switching operations at the corresponding times.

2. The method according to claim 1, characterized in that, In step S31, the initial antenna beam alignment and satellite search operations are performed, specifically including: Step S311: Receive broadcast messages from the satellite with the highest elevation angle among the currently unobstructed satellites; Step S312: Determine if a broadcast message is being sent in the direction of the maximum elevation angle; Step S313: If not, remove the corresponding satellite data and then proceed to step S301; if yes, proceed to step S32.

3. The method according to claim 1, characterized in that, The ephemeris data is either pre-stored in the terminal or imported from an external source.

4. The method according to claim 1, characterized in that, Step S2 specifically includes: After the terminal is powered on, the image measurement instrument is started. Through measurement, modeling, and field of view analysis, the occlusion data in the azimuth and elevation of the terminal's location is obtained.

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