A method for implementing navigation information augmentation for a satellite system
Patent Information
- Application Number
- CN202511952417.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-10-27
AI Technical Summary
卫星导航系统存在其固有问题：中高轨卫星播发的导航信号经过数万千米传输，落地电平低，容易受到树木、建筑物遮挡，也容易受到其他通信系统甚至恶意干扰的影响
1、本发明设计了一种卫星系统信令波束利用广播消息实现导航增强信息播发的方法，导航增强信息星载基站分段播发，卫星终端接收合段的方法，适配广播消息的承载能力。
Smart Images
Figure CN122993785A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of satellite mobile communication technology, and in particular to a method for enhancing navigation information in a satellite system, which can be used to implement navigation functions in satellite communication. Background Technology
[0002] Satellite navigation systems can provide global coverage, low cost, and high precision time and space services, and have become the foundation and core of international time and space information services. However, satellite navigation systems have inherent problems: navigation signals broadcast by medium- and high-orbit satellites travel tens of thousands of kilometers, resulting in low signal strength upon landing, making them susceptible to obstruction by trees and buildings, as well as interference from other communication systems and even malicious interference.
[0003] Low-Earth orbit (LEO) satellite communication systems are characterized by high grounding power, high information transmission rates, and two-way security authentication. By supplementing, backing up, and enhancing satellite navigation systems through satellite communication networks, they exhibit significant synergistic advantages. Navigation signals are directly broadcast through the communication system, enabling joint positioning with the navigation system and achieving better navigation signal coverage. Summary of the Invention
[0004] In view of this, the present invention provides a method for satellite systems to enhance navigation information, which enables satellite systems to enhance navigation information by relying on communication resources, thereby reducing the complexity of implementation.
[0005] The technical solution adopted in this invention is as follows: A method for enhancing navigation information in a satellite system, based on a satellite mobile communication system consisting of a satellite terminal, an onboard base station, and a core network, includes the following processes: The steps of a signaling beam broadcasting a minimum message information envelope via a broadcast message include: (101) The core network transmits navigation enhancement messages to the satellite-borne base station through the gateway station; (102) After receiving the navigation enhancement message, the satellite base station segments the content of the navigation enhancement message data packet according to a fixed length and gives a segmentation identifier; (103) The satellite base station encapsulates the segmented navigation enhancement message content into a broadcast message in sequence and broadcasts it, and replies to the core network with navigation enhancement message response information; (104) After receiving the broadcast message, the satellite terminal performs segmentation processing according to the segmentation identifier and parses out the navigation enhancement message; The steps for a service beam to broadcast the maximum message envelope or broadcast on demand through a service channel include: (201) The satellite terminal initiates an RRC connection establishment request to the satellite base station through a random access procedure, carrying the terminal's identifier and the reason for the establishment; (202) The satellite base station allocates resources to the satellite terminal and establishes an SRB bearer, and sends an RRC establishment message to the satellite terminal; (203) The satellite terminal sends an RRC establishment completion message to the satellite base station, indicating that the RRC connection has been successfully established; the RRC establishment completion message includes core network information and non-access stratum information. (204) The satellite base station assigns a dedicated access network identifier to the satellite terminal, selects the access and mobility management function node of the core network according to the core network information it carries, and then sends the non-access stratum message carried in the RRC establishment completion message to the core network through the initial UE message; (205) The core network sends an initial context establishment request message to the satellite base station, and the satellite base station initiates the initial context establishment process; (206) The satellite base station sends a security mode message to the satellite terminal. The message contains the selection of encryption algorithm and integrity protection algorithm, and starts the integrity protection and encryption process. (207) After receiving the security mode message, the satellite terminal selects a derived key according to the algorithm in the message, verifies the security mode message, and then returns a security mode completion message to the satellite base station. (208) The satellite base station allocates radio resources according to the policy of the satellite terminal service request, sends an RRC reconfiguration message to the satellite terminal, and initiates the establishment of a data radio bearer; (209) After the satellite terminal completes the establishment of the data radio bearer, it replies with an RRC reconfiguration completion message to the satellite base station; (210) The satellite base station replies to the core network with an initial context establishment response. At this point, the service channel between the satellite terminal and the satellite base station is established, and the service channel between the satellite base station and the core network is established. (211) The core network forwards navigation enhancement information messages to the satellite base station through the service channel, and the satellite base station sends the navigation enhancement information messages to the satellite terminal through the service channel.
[0006] Furthermore, in step (102), the fixed length is determined based on the size of the content that the satellite base station broadcast message can carry.
[0007] Furthermore, in step (103), the broadcast message is broadcast according to the last-in-first-out principle, that is, after the satellite base station receives a new navigation enhancement message, it immediately broadcasts the new navigation enhancement message content; otherwise, it repeatedly broadcasts the latest set of navigation enhancement messages.
[0008] Compared with the prior art, the present invention has the following advantages: 1. This invention designs a method for broadcasting navigation enhancement information using satellite system signaling beams via broadcast messages. The method involves broadcasting navigation enhancement information in segments by the satellite-borne base station and receiving and combining the segments by the satellite terminal, adapting to the carrying capacity of broadcast messages.
[0009] 2. This invention designs a method for broadcasting navigation enhancement information using a satellite system service beam through a service channel. It can broadcast the maximum message information envelope through the service channel or broadcast it on demand by the user. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the application scenario of the satellite mobile communication system in an embodiment of the present invention.
[0011] Figure 2 This is a schematic diagram of the format of the present invention.
[0012] Figure 3 This is a flowchart illustrating the implementation of signaling beam broadcast navigation enhancement information according to the present invention.
[0013] Figure 4 This is a flowchart illustrating the implementation of enhanced navigation information broadcast via service beams in this invention. Detailed Implementation
[0014] The present invention will now be described in further detail with reference to the accompanying drawings.
[0015] A method for enhancing navigation information in a satellite system, the method is based on Figure 1 The illustrated satellite mobile communication system includes a satellite terminal, a mobile communication satellite, an onboard base station, and a core network. The satellite terminal is located on the ground, while the onboard base station is mounted on the mobile communication satellite. The interface between the onboard base station and the satellite terminal is a UU interface, and the interface between the onboard base station and the core network is a power supply interface.
[0016] Navigation enhancement messages are information used in satellite navigation systems to describe satellite position, satellite clock bias, and other related parameters. They generally include satellite ephemeris, satellite clock bias, atmospheric delay correction, integrity, and other information.
[0017] The signaling beam broadcasts the minimum message information envelope through a broadcast message, while the service beam broadcasts the maximum message information envelope through the service channel or broadcasts it on demand. like Figure 3 As shown, the signaling beam broadcasts the minimum message information envelope via broadcast messages, including the following steps: (101) The core network sends the navigation enhancement message (Length=135 bytes) to the satellite base station through the gateway station; (102) After receiving the navigation enhancement message, the satellite-based base station segments the navigation enhancement message data packet into segments of fixed length, such as... Figure 2 As shown, it is divided into 7 segments, and segment identifiers are given; the fixed length is determined based on the content size that the satellite base station broadcast message can carry, and in this embodiment, the fixed length is set to L=20 bytes; (103) The satellite base station encapsulates the segmented navigation enhancement message content into a broadcast message in the order of 1-7 and broadcasts it, and replies to the core network with navigation enhancement message response information; the broadcast message is broadcast according to the last-in-first-out principle, that is, after the satellite base station receives a new navigation enhancement message, it immediately broadcasts the new navigation enhancement message content, otherwise it repeatedly broadcasts the latest set of navigation enhancement messages in history. (104) After receiving the broadcast message, the satellite terminal performs segmentation processing according to the segmentation identifier and parses out the navigation enhancement message.
[0018] like Figure 4 The steps for the service beam shown to broadcast the maximum message envelope or broadcast on demand through the service channel include: (201) The satellite terminal initiates an RRC connection establishment request to the satellite base station through a random access procedure, carrying the terminal's identifier and the reason for the establishment; (202) The satellite base station allocates resources to the satellite terminal and establishes an SRB bearer, and sends an RRC establishment message to the satellite terminal; (203) The satellite terminal sends an RRC establishment completion message to the satellite base station, indicating that the RRC connection has been successfully established; the RRC establishment completion message includes core network information and non-access stratum information. (204) The satellite base station assigns a dedicated access network identifier to the satellite terminal, selects the access and mobility management function node of the core network according to the core network information it carries, and then sends the non-access stratum message carried in the RRC establishment completion message to the core network through the initial UE message; (205) The core network sends an initial context establishment request message to the satellite base station, and the satellite base station initiates the initial context establishment process; (206) The satellite base station sends a security mode message to the satellite terminal. The message contains the selection of encryption algorithm and integrity protection algorithm, and starts the integrity protection and encryption process. (207) After receiving the security mode message, the satellite terminal selects a derived key according to the algorithm in the message, verifies the security mode message, and then returns a security mode completion message to the satellite base station. (208) The satellite base station allocates radio resources according to the policy of the satellite terminal service request, sends an RRC reconfiguration message to the satellite terminal, and initiates the establishment of a data radio bearer; (209) After the satellite terminal completes the establishment of the data radio bearer, it replies with an RRC reconfiguration completion message to the satellite base station; (210) The satellite base station replies to the core network with an initial context establishment response. At this point, the service channel between the satellite terminal and the satellite base station is established, and the service channel between the satellite base station and the core network is established. (211) The core network forwards navigation enhancement information messages to the satellite base station through the service channel, and the satellite base station sends the navigation enhancement information messages to the satellite terminal through the service channel.
[0019] The above embodiments describe in detail the process of satellite systems enhancing navigation information based on broadcast messages and service channels. Compared with the traditional design of communication functions and navigation enhancement functions separately, this method realizes the integrated design of communication and navigation, so that navigation is available whenever there is communication.
[0020] In summary, this invention provides an original method for enhancing navigation information in satellite systems. In particular, this embodiment is applicable to spaceborne satellite mobile communication systems. By directly broadcasting navigation signals through the communication system and co-locating with the navigation system, it achieves better navigation signal coverage and reduces the complexity of satellite system implementation.
Claims
1. A method for enhancing navigation information in a satellite system, characterized in that, This is achieved through a satellite mobile communication system consisting of satellite terminals, onboard base stations, and a core network; and includes the following processes: The steps of a signaling beam broadcasting a minimum message information envelope via a broadcast message include: (101) The core network transmits navigation enhancement messages to the satellite-borne base station through the gateway station; (102) After receiving the navigation enhancement message, the satellite base station segments the content of the navigation enhancement message data packet according to a fixed length and gives a segmentation identifier; (103) The satellite base station encapsulates the segmented navigation enhancement message content into a broadcast message in sequence and broadcasts it, and replies to the core network with navigation enhancement message response information; (104) After receiving the broadcast message, the satellite terminal performs segmentation processing according to the segmentation identifier and parses out the navigation enhancement message; The steps for a service beam to broadcast the maximum message envelope or broadcast on demand through a service channel include: (201) The satellite terminal initiates an RRC connection establishment request to the satellite base station through a random access procedure, carrying the terminal's identifier and the reason for the establishment; (202) The satellite base station allocates resources to the satellite terminal and establishes an SRB bearer, and sends an RRC establishment message to the satellite terminal; (203) The satellite terminal sends an RRC establishment completion message to the satellite base station, indicating that the RRC connection has been successfully established; the RRC establishment completion message includes core network information and non-access stratum information. (204) The satellite base station assigns a dedicated access network identifier to the satellite terminal, selects the access and mobility management function node of the core network according to the core network information it carries, and then sends the non-access stratum message carried in the RRC establishment completion message to the core network through the initial UE message; (205) The core network sends an initial context establishment request message to the satellite base station, and the satellite base station initiates the initial context establishment process; (206) The satellite base station sends a security mode message to the satellite terminal. The message contains the selection of encryption algorithm and integrity protection algorithm, and starts the integrity protection and encryption process. (207) After receiving the security mode message, the satellite terminal selects a derived key according to the algorithm in the message, verifies the security mode message, and then returns a security mode completion message to the satellite base station. (208) The satellite base station allocates radio resources according to the policy of the satellite terminal service request, sends an RRC reconfiguration message to the satellite terminal, and initiates the establishment of a data radio bearer; (209) After the satellite terminal completes the establishment of the data radio bearer, it replies with an RRC reconfiguration completion message to the satellite base station; (210) The satellite base station replies to the core network with an initial context establishment response. At this point, the service channel between the satellite terminal and the satellite base station is established, and the service channel between the satellite base station and the core network is established. (211) The core network forwards navigation enhancement information messages to the satellite base station through the service channel, and the satellite base station sends the navigation enhancement information messages to the satellite terminal through the service channel.
2. The method for enhancing navigation information in a satellite system according to claim 1, characterized in that, In step (102), the fixed length is determined based on the content size that the satellite base station broadcast message can carry.
3. The method for enhancing navigation information in a satellite system according to claim 1, characterized in that, In step (103), the broadcast message is broadcast according to the last-in-first-out principle, that is, after the satellite base station receives a new navigation enhancement message, it immediately broadcasts the new navigation enhancement message content; otherwise, it repeatedly broadcasts the latest set of navigation enhancement messages.