Satellite communication link switching method, device, high and low orbit integration system and medium

Abstract

The present application provides a satellite communication link switching method, apparatus, high-low orbit integration system and medium. The method includes: obtaining the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment; determining the low-orbit satellite transit time according to the latest low-orbit ephemeris, where the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to the minimum satellite communication elevation angle between the horizon where the ground station is located; obtaining the signal strength of the low-orbit satellite at the current moment; judging whether the condition for switching to the communication link of the low-orbit satellite is met according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite; and in response to meeting the condition for switching to the communication link of the low-orbit satellite, switching the communication link of the high-orbit satellite to the communication link of the low-orbit satellite. The method of the present application can improve the efficiency of switching to the communication link of the low-orbit satellite, so that data is not easily lost.

Description

Technical Field

[0001] The present application relates to satellite technology, and in particular, to a satellite communication link switching method, apparatus, high and low orbit integration system, and medium. Background Art

[0002] In recent years, satellite Internet technology represented by high-orbit satellites and low-orbit satellites has developed vigorously. Among them, high-orbit satellites operate at an orbit altitude of about 35,800 km from the earth's surface and remain relatively stationary with the earth, having characteristics such as a wide coverage range and a large communication capacity. Low-orbit satellites operate at an orbit altitude of about 300 - 2,000 km, having characteristics such as short transmission delay and high link rate. However, high-orbit satellites have problems of long transmission delay and low link rate; while low-orbit satellites have a small coverage range, and each pass can only provide about ten minutes of continuous communication duration for a local area. Therefore, a single high-orbit satellite network or low-orbit satellite network is difficult to meet the requirements of the communication network. In order to combine the respective advantages of high-orbit satellites and low-orbit satellites, a satellite communication link switching method has emerged.

[0003] Currently, the satellite communication link switching method mainly includes: building a high-orbit ground station for high-orbit satellites to process high-orbit satellite signals, and building a low-orbit ground station for low-orbit satellites to process low-orbit satellite signals. Relevant staff regularly detect and record the status of the communication link of low-orbit satellites, and manually switch to the communication link of low-orbit satellites when it is determined that the communication link of low-orbit satellites is available, so as to perform network communication through the communication link of low-orbit satellites.

[0004] However, the manual switching method has a long operation time, which may cause the situation that the low-orbit satellite can already be switched, but has not been successfully switched to the communication link of the low-orbit satellite, resulting in data loss. Summary of the Invention

[0005] The present application provides a satellite communication link switching method, apparatus, high and low orbit integration system, and medium, which are used to solve the technical problem in the prior art that the manual switching method of the communication link of low-orbit satellites is prone to data loss.

[0006] In a first aspect, the present application provides a satellite communication link switching method, which is applied to a high and low orbit integration system of a ground station. The method includes:

[0007] Obtain the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment;

[0008] According to the latest low-orbit ephemeris, determine the transit time of the low-orbit satellite; the transit time of the low-orbit satellite is the time corresponding to when the low-orbit satellite flies to an elevation angle between the ground station and the horizon that is the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing the communication link of the low-orbit satellite;

[0009] Obtain the signal strength of the low-earth orbit satellite at the current moment;

[0010] According to the low-earth orbit satellite transit time and the signal strength of the low-earth orbit satellite, determine whether the condition for switching to the communication link of the low-earth orbit satellite is met;

[0011] In response to meeting the condition for switching to the communication link of the low-earth orbit satellite, switch the communication link of the geostationary orbit satellite to the communication link of the low-earth orbit satellite.

[0012] In one embodiment, the obtaining the latest low-earth orbit ephemeris and the preset signal strength threshold for establishing a link with the low-earth orbit satellite includes:

[0013] After detecting that the ground station is powered on, track the geostationary orbit satellite through a preset frequency band antenna to establish a communication link with the geostationary orbit satellite;

[0014] Based on the communication link of the geostationary orbit satellite, obtain the latest low-earth orbit ephemeris and the preset signal strength threshold for establishing a link with the low-earth orbit satellite from the ground public network.

[0015] In one embodiment, the determining the low-earth orbit satellite transit time according to the latest low-earth orbit ephemeris includes:

[0016] Based on the latest low-earth orbit ephemeris and the position information of the ground station, determine the time-varying trajectory map of the low-earth orbit satellite; wherein, the time-varying trajectory map of the low-earth orbit satellite is a flight trajectory map predicting the relative position of the low-earth orbit satellite with respect to the ground station over time, and the time-varying trajectory map of the low-earth orbit satellite includes the time points corresponding to the low-earth orbit satellite flying to multiple flight positions;

[0017] Determine the satellite communication elevation angle at each of the flight positions in the time-varying trajectory map of the low-earth orbit satellite;

[0018] Determine the time point corresponding to the flight position in the time-varying trajectory map of the low-earth orbit satellite where the minimum satellite communication elevation angle is located as the low-earth orbit satellite transit time.

[0019] In one embodiment, the obtaining the signal strength of the low-earth orbit satellite at the current moment includes:

[0020] Send the latest low-earth orbit ephemeris to the preset frequency band antenna so that the preset frequency band antenna tracks the low-earth orbit satellite;

[0021] Obtain the signal of the low-earth orbit satellite obtained through the preset frequency band antenna, and determine the signal strength of the low-earth orbit satellite at the current moment.

[0022] In one embodiment, the signal of the low-earth orbit satellite includes a satellite carrier signal and an interference signal in the transmission space;

[0023] Then, determining whether the condition for switching to the communication link of the low-earth orbit satellite is met according to the low-earth orbit satellite transit time and the signal strength of the low-earth orbit satellite includes:

[0024] Determining whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for establishing a link in the low-earth orbit;

[0025] In response to the signal strength of the low-earth orbit satellite reaching the signal strength threshold for establishing a link in the low-earth orbit, obtaining a time point to be determined, where the time point to be determined is the time point when the signal strength of the low-earth orbit satellite reaches the signal strength threshold for establishing a link in the low-earth orbit;

[0026] Judging whether the low-earth orbit satellite transits according to the time point to be determined and the low-earth orbit satellite transit time;

[0027] In response to the low-earth orbit satellite transiting, determining that the high-low orbit fusion system of the ground station meets the condition for switching to the communication link of the low-earth orbit satellite.

[0028] In one embodiment, judging whether the low-earth orbit satellite transits according to the time point to be determined and the low-earth orbit satellite transit time includes:

[0029] Determining the time difference between the time point to be determined and the low-earth orbit satellite transit time;

[0030] In response to the time difference being less than or equal to a preset time difference, determining that the low-earth orbit satellite transits;

[0031] In response to the time difference being greater than the preset time difference, determining that the low-earth orbit satellite does not transit.

[0032] In one embodiment, the high-low orbit fusion system of the ground station includes a preset frequency band antenna, a radio frequency switch, and a network switch. Responding to meeting the condition for switching to the communication link of the low-earth orbit satellite and switching the communication link of the geostationary orbit satellite to the communication link of the low-earth orbit satellite includes:

[0033] In response to meeting the condition for switching to the communication link of the low-earth orbit satellite, controlling the preset frequency band antenna to adjust to track the low-earth orbit satellite;

[0034] Controlling the radio frequency switch to switch the baseband intermediate frequency signal of the geostationary orbit modulator-demodulator to the baseband intermediate frequency signal of the low-earth orbit modulator-demodulator;

[0035] Controlling the network switch to switch the network signal of the geostationary orbit modulator-demodulator to the network signal of the low-earth orbit modulator-demodulator;

[0036] When the network switch completes the switching of the network signal, it is determined that the step of switching the communication link of the high-orbit satellite to the communication link of the low-orbit satellite is completed.

[0037] In one embodiment, after the communication link of the high-orbit satellite is switched to the communication link of the low-orbit satellite, it further includes:

[0038] Obtain a data acquisition request of the user terminal through the network switch, where the data acquisition request includes the data to be acquired;

[0039] Modulate and demodulate the data acquisition request through the low-orbit modulator-demodulator to obtain a processed data acquisition request, where the processed data acquisition request is an IP stream suitable for transmission through the communication link of the low-orbit satellite;

[0040] Transmit the processed data acquisition request to the terrestrial public network through the communication link of the low-orbit satellite via the preset frequency band antenna, so as to obtain the data to be acquired from the terrestrial public network and transmit it back to the user terminal.

[0041] In a second aspect, the present application provides a satellite communication link switching device, which is a high-low orbit fusion system located at a ground station. The device includes:

[0042] A data acquisition module, configured to acquire the latest low-orbit ephemeris and a preset signal strength threshold for establishing a low-orbit link;

[0043] A time determination module, configured to determine the low-orbit satellite transit time according to the latest low-orbit ephemeris; the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to an elevation angle with the horizon where the ground station is located being the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing the communication link of the low-orbit satellite;

[0044] A signal strength acquisition module, configured to acquire the signal strength of the low-orbit satellite at the current moment;

[0045] A condition judgment module, configured to judge whether the condition for switching to the communication link of the low-orbit satellite is met according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite;

[0046] A low-orbit link switching module, configured to switch the communication link of the high-orbit satellite to the communication link of the low-orbit satellite in response to the condition for switching to the communication link of the low-orbit satellite being met.

[0047] In a third aspect, the present application provides a high-low orbit fusion system for a ground station, including: a processor, and a memory communicatively connected to the processor;

[0048] The memory stores computer execution instructions;

[0049] The processor executes the computer-executable instructions stored in the memory to implement the method described in the first aspect.

[0050] In a fourth aspect, the present application provides a computer-readable storage medium storing computer-executable instructions, which are used to implement the method described in the first aspect when executed by a processor.

[0051] In a fifth aspect, the present application provides a computer program product including a computer program, which implements the method described in the first aspect when executed by a processor.

[0052] The satellite communication link switching method, device, high-low orbit integrated system and medium provided by the present application obtain the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment; determine the low-orbit satellite transit time according to the latest low-orbit ephemeris; the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to an elevation angle between the ground station and the horizon that is the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing a communication link with the low-orbit satellite; obtain the signal strength of the low-orbit satellite at the current moment; determine whether the condition for switching to the communication link of the low-orbit satellite is met according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite; in response to meeting the condition for switching to the communication link of the low-orbit satellite, switch the communication link of the high-orbit satellite to the communication link of the low-orbit satellite. The present application determines the low-orbit satellite transit time according to the obtained latest low-orbit ephemeris, and then combines the signal strength of the low-orbit satellite at the current moment to comprehensively determine whether the condition for switching the communication link of the low-orbit satellite is met, and automatically switches when the switching condition is met. Compared with the prior art, the switching efficiency of manually switching to the communication link of the low-orbit satellite is higher, and the situation where the low-orbit satellite can be switched but has not been successfully switched will not occur, so data is not easily lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0054] Figure 1 A schematic diagram of an application scenario for implementing the satellite communication link switching method according to an embodiment of the present application;

[0055] Figure 2 A flowchart of implementing the satellite communication link switching method according to an embodiment of the present application;

[0056] Figure 3Schematic diagram of the scenario where the high-low orbit fusion system of the ground station in the embodiment of the present application operates in the high orbit mode;

[0057] Figure 4 Schematic diagram of the scenario where the high-low orbit fusion system of the ground station in the embodiment of the present application operates in the low orbit mode;

[0058] Figure 5 Schematic flowchart of the method for implementing satellite communication link switching in another embodiment of the present application;

[0059] Figure 6 Schematic structural diagram of the method for implementing satellite communication link switching in the present application;

[0060] Figure 7 Schematic structural diagram of the high-low orbit fusion system of the ground station for implementing the method of satellite communication link switching;

[0061] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0062] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0063] To clearly understand the technical solution of the present application, the solutions of the prior art will be introduced in detail first.

[0064] In the traditional method, the satellite communication link switching method mainly includes: building a high-orbit ground station for handling high-orbit satellite signals for high-orbit satellites, and building a low-orbit ground station for handling low-orbit satellite signals for low-orbit satellites. The relevant staff regularly detect and record the status of the communication link of the low-orbit satellite, and manually switch to the communication link of the low-orbit satellite when it is determined that the communication link of the low-orbit satellite is available, so as to perform network communication through the communication link of the low-orbit satellite.

[0065] However, the manual switching method has a long operation time, which may result in the situation that the low-orbit satellite can be switched, but the switch to the communication link of the low-orbit satellite has not been successfully completed, resulting in data loss.

[0066] Therefore, when facing the technical problems of the prior art, the inventor found through creative research that in order to reduce data loss and make data not easily lost, it is necessary to automatically detect whether the condition for switching to the communication link of the low-earth orbit satellite is met according to the transit time and signal strength of the low-earth orbit satellite. When the switching condition is reached, the communication link is automatically switched from the communication link of the high-earth orbit satellite to the communication link of the low-earth orbit satellite. This method is different from manual switching and does not require manual detection and switching, and can realize the switch to the communication link of the low-earth orbit satellite in a timely and efficient manner, so as to achieve the purpose of not easily losing data.

[0067] As Figure 1 shown, the application scenario of the satellite communication link switching method provided by the embodiment of the present application. In the corresponding network architecture of this application scenario, it includes multiple network devices 1, a high-low orbit fusion system 2 of a ground station, and a ground public network 3. The multiple network devices 1 can achieve communication connection with the high-low orbit fusion system 2 of the ground station through the network switch 25 of the high-low orbit fusion system 2 of the ground station. There are also a geostationary orbit gateway station 32 and a low-earth orbit gateway station 31 between the high-low orbit fusion system 2 of the ground station and the ground public network 3. If the high-low orbit fusion system 2 of the ground station locks the low-earth orbit satellite and completes the construction of the communication link of the low-earth orbit satellite, it can communicate with the ground public network 3 through the low-earth orbit gateway station 31. If the high-low orbit fusion system 2 of the ground station locks the geostationary orbit satellite and completes the construction of the communication link of the geostationary orbit satellite, it can communicate with the ground public network 3 through the geostationary orbit gateway station 32. Therefore, each network device 1 can communicate with the ground public network 3 through the communication link of the low-earth orbit satellite or the communication link of the geostationary orbit satellite through the high-low orbit fusion system 2 of the ground station.

[0068] The high-low orbit fusion system 2 of the ground station mainly includes a preset frequency band antenna 21, a radio frequency switch 22, a geostationary orbit modem 23, a low-earth orbit modem 24, a network switch 25, and a switching control unit 26. Among them, the preset frequency band of the preset frequency band antenna 21 can be the Ka band or the Ku band. The preset frequency band antenna 21 can be used to lock and track the geostationary orbit satellite and the low-earth orbit satellite to assist in completing the link establishment. The radio frequency switch 22 can be used to realize the switching of the baseband intermediate frequency signals of the geostationary orbit modem 23 and the low-earth orbit modem 24. The geostationary orbit modem 23 can be used to modulate and demodulate the IP stream coming from the network device 1 so that the processed IP stream is suitable for transmission on the communication link of the geostationary orbit satellite. The low-earth orbit modem 24 can be used to modulate and demodulate the IP stream of the network device 1 so that the processed IP stream is suitable for transmission on the communication link of the low-earth orbit satellite. The IP stream mentioned here refers to the information flow of media and signaling. The network switch 25 can be used to connect multiple network devices 1 and realize the switching of network signals for each network device 1, so that each network device 1 communicates with the ground public network 3 through the communication link of the low-earth orbit satellite or the communication link of the geostationary orbit satellite.

[0069] The handover control unit 26 can be used to send a first handover instruction to the preset frequency band antenna 21, the radio frequency switch 22, and the network switch 25 respectively when switching the communication link of the geostationary satellite to the communication link of the low earth orbit satellite, so that the preset frequency band antenna 21, the radio frequency switch 22, and the network switch 25 can each orderly execute actions related to switching to the communication link of the low earth orbit satellite, thereby completing the handover from the communication link of the geostationary satellite to the communication link of the low earth orbit satellite.

[0070] In addition, the handover control unit 26 can also be used to send a first handover instruction to the preset frequency band antenna 21, the radio frequency switch 22, and the network switch 25 respectively when switching the communication link of the low earth orbit satellite to the communication link of the geostationary satellite, so that the preset frequency band antenna 21, the radio frequency switch 22, and the network switch 25 can each orderly execute actions related to switching to the communication link of the geostationary satellite, thereby completing the handover from the communication link of the low earth orbit satellite to the communication link of the geostationary satellite.

[0071] When the high-low orbit integration system 2 of the ground station executes the satellite communication link handover method, specifically when executing the handover of the communication link of the geostationary satellite to the communication link of the low earth orbit satellite, it first obtains the latest low earth orbit ephemeris and the preset signal strength threshold for establishing a link with the low earth orbit from the ground public network 3. Then, it determines the low earth orbit satellite transit time according to the latest low earth orbit ephemeris. The low earth orbit satellite transit time is the time corresponding to when the low earth orbit satellite flies to the minimum satellite communication elevation angle between the ground station's horizon. It obtains the signal strength of the low earth orbit satellite at the current moment, and determines whether the condition for switching to the communication link of the low earth orbit satellite is met according to the low earth orbit satellite transit time and the signal strength of the low earth orbit satellite. When it is determined that the condition for switching to the communication link of the low earth orbit satellite is met, it switches to the communication link of the low earth orbit satellite. After the handover is successful, each network device 1 can communicate with the ground public network 3 through the communication link of the low earth orbit satellite.

[0072] The following uses specific embodiments to elaborate in detail on the technical solution of the present application and how the technical solution of the present application solves the above technical problems. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following will describe the embodiments of the present application in conjunction with the accompanying drawings.

[0073] Figure 2 This is a satellite communication link handover method provided by an embodiment of the present application. As Figure 2 shown, the execution subject of the satellite communication link handover method provided in this embodiment is the high-low orbit integration system of the ground station. Then, the satellite communication link handover method provided in this embodiment includes the following steps:

[0074] Step 101: Obtain the latest low-earth orbit ephemeris and the preset signal strength threshold for low-earth orbit link establishment.

[0075] Among them, the GPS ephemeris of a satellite can generally be used to describe the time, speed, and position of the satellite being tracked in space. The latest low-earth orbit ephemeris is the GPS ephemeris of the latest low-earth orbit satellite. The preset signal strength threshold for low-earth orbit link establishment is pre-set, which is the minimum signal strength value to achieve the establishment of a communication link for a low-earth orbit satellite.

[0076] The latest low-earth orbit ephemeris and the preset signal strength threshold for low-earth orbit link establishment can be obtained from the ground public network after the ground station is powered on.

[0077] Step 102: Determine the low-earth orbit satellite transit time according to the latest low-earth orbit ephemeris.

[0078] Among them, the minimum satellite communication elevation angle is the satellite communication elevation angle to achieve the establishment of a communication link for a low-earth orbit satellite. When the elevation angle between the low-earth orbit satellite and the horizon where the ground station is located is the minimum satellite communication elevation angle, it can be considered that the low-earth orbit satellite is in transit. Before reaching the minimum satellite communication elevation angle, the low-earth orbit satellite has not transited.

[0079] The low-earth orbit satellite transit time is the time point when a communication link can be established for the low-earth orbit satellite, that is, the time corresponding to when the low-earth orbit satellite flies to the elevation angle between it and the horizon where the ground station is located being the minimum satellite communication elevation angle.

[0080] Since the latest low-earth orbit ephemeris includes information such as the position and flight speed of the low-earth orbit satellite, the flight trajectory of the low-earth orbit satellite relative to the ground station can be predicted, so as to determine when the low-earth orbit satellite will transit (that is, determine the low-earth orbit satellite transit time).

[0081] Step 103: Obtain the signal strength of the low-earth orbit satellite at the current moment.

[0082] Among them, the signal strength of the low-earth orbit satellite characterizes the strength of the signal of the low-earth orbit satellite. Here, the signal strength of the low-earth orbit satellite is the signal strength during the actual flight of the low-earth orbit satellite.

[0083] Assume that the switching condition is judged at the next moment. Then, the signal of the low-earth orbit satellite at the current moment refers to the nearest moment before the switching condition judgment, that is, the previous moment before the switching condition judgment. Since the entire calculation and judgment time is very short, the finer the accuracy of the moment, the more accurate the signal strength of the low-earth orbit satellite at the current moment as one of the bases for the switching judgment condition will be. For example, it can be in milliseconds.

[0084] Step 104: Judge whether the condition for switching to the communication link of the low-earth orbit satellite is met according to the low-earth orbit satellite transit time and the signal strength of the low-earth orbit satellite.

[0085] Among them, since the transit time of the low-earth orbit satellite can be used to determine whether the low-earth orbit satellite is in transit, and the signal strength of the low-earth orbit satellite can be used to determine whether the signal strength of the low-earth orbit satellite meets the signal strength requirements for low-earth orbit link establishment. However, using only the transit time of the low-earth orbit satellite to determine whether the low-earth orbit satellite is in transit may result in a situation where the signal strength during the transit of the low-earth orbit satellite does not meet the signal strength requirements, such as interference or occlusion of the low-earth orbit satellite. In this case, it is not suitable to switch to the communication link of the low-earth orbit satellite. And using only the signal strength of the low-earth orbit satellite to determine whether the signal strength of the low-earth orbit satellite meets the signal strength requirements may result in a situation where although the signal strength of the low-earth orbit satellite reaches the signal strength requirements for low-earth orbit link establishment, it cannot be excluded whether it is interfered by the interference signal in the transmission space, and the actual low-earth orbit satellite may not be in transit or may be in transit.

[0086] Therefore, the two factors of the transit time of the low-earth orbit satellite and the signal strength of the low-earth orbit satellite are comprehensively used to determine whether the condition for switching to the communication link of the low-earth orbit satellite is met. In this way, it can be ensured that the low-earth orbit satellite switches to the communication link of the low-earth orbit satellite only when the signal strength meets the signal strength requirements for low-earth orbit link establishment and when it is in transit, thereby effectively improving the availability of switching to the communication link of the low-earth orbit satellite.

[0087] Step 105, in response to meeting the condition for switching to the communication link of the low-earth orbit satellite, switch the communication link of the geostationary orbit satellite to the communication link of the low-earth orbit satellite.

[0088] Among them, the ground station and the ground public network can only use the communication link of the geostationary orbit satellite or the communication link of the low-earth orbit satellite for communication at the same time, but cannot use them simultaneously. Because the transmission rate of the communication link of the geostationary orbit satellite is low, and the transmission rate of the communication link of the low-earth orbit satellite is high. Using them simultaneously will result in a large difference in the transmission delay of the data packets obtained from the ground public network arriving at the network device through different communication links, and the advantages of the communication link of the low-earth orbit satellite cannot be utilized normally. For example, when the data packet is a video stream, assume that 9 / 10 of the video stream is transmitted to the target network device through the communication link of the low-earth orbit satellite, which takes 30 milliseconds; and 1 / 10 of the video stream is transmitted to the target network device through the communication link of the geostationary orbit satellite, which takes 600 milliseconds; therefore, when the target network device receives 9 / 10 of the video stream transmitted from the communication link of the low-earth orbit satellite, the target network device has been buffering until it receives 1 / 10 of the video stream transmitted from the communication link of the geostationary orbit satellite.

[0089] Therefore, when the condition for switching to the communication link of the low-earth orbit satellite is met, in order to be able to utilize the advantages of the low-earth orbit satellite such as short transmission delay and high link rate normally, the established communication link of the geostationary orbit satellite can be switched to the communication link of the low-earth orbit satellite.

[0090] The specific switching operation is automatically executed by the high-low orbit fusion system of the ground station. After switching from the communication link of the high-orbit satellite to the communication link of the low-orbit satellite, each network device communicates with the terrestrial public network through the communication link of the low-orbit satellite to achieve data transmission.

[0091] Before switching to the communication link of the low-orbit satellite, as Figure 3 shown, the IP flow of each network device 1 sequentially passes through the network switch 25, the high-orbit modem 23, the RF switch 22, the preset frequency band antenna 21, the communication link of the high-orbit satellite, the high-orbit gateway station 32 to reach the terrestrial public network 3. After obtaining data from the terrestrial public network 3, it returns to each network device along the original path.

[0092] After switching to the communication link of the low-orbit satellite, as Figure 4 shown, the IP flow of each network device 1 sequentially passes through the network switch 25, the low-orbit modem 24, the RF switch 22, the preset frequency band antenna 21, the communication link of the low-orbit satellite, the low-orbit gateway station 32 to reach the terrestrial public network 3. After obtaining data from the terrestrial public network 3, it returns to each network device along the original path.

[0093] In this application, the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment are obtained; according to the latest low-orbit ephemeris, the low-orbit satellite transit time is determined; the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to the elevation angle between the ground station's horizon and the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing the communication link of the low-orbit satellite; the signal strength of the low-orbit satellite at the current moment is obtained; according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite, it is judged whether the condition for switching to the communication link of the low-orbit satellite is met; in response to meeting the condition for switching to the communication link of the low-orbit satellite, the communication link of the high-orbit satellite is switched to the communication link of the low-orbit satellite. This application determines the low-orbit satellite transit time based on the obtained latest low-orbit ephemeris, and then combines the signal strength of the low-orbit satellite at the current moment to comprehensively judge whether the condition for switching the communication link of the low-orbit satellite is met. When the switching condition is met, the switch is automatically performed. Compared with the prior art, the switching efficiency of manually switching to the communication link of the low-orbit satellite is higher, and the situation where the low-orbit satellite can be switched but the switching is not successful will not occur, so data is not easily lost.

[0094] As an alternative embodiment, as Figure 5 shown, in this embodiment, step 101 includes the following steps:

[0095] Step 201, after detecting that the ground station is powered on, track the high-orbit satellite through the preset frequency band antenna to establish a communication link with the high-orbit satellite.

[0096] Among them, the high-low orbit fusion system of the ground station can monitor the on / off state of the ground station. Since the geostationary satellite remains relatively stationary with respect to the Earth, after the high-low orbit fusion system of the ground station monitors that the ground station is powered on, it can quickly find the geostationary satellite through the preset frequency band antenna and track it to complete the link establishment with the geostationary satellite, so that the high-low orbit fusion system of the ground station operates in the high-orbit mode. In the high-orbit mode, each network device connected to the network switch of the high-low orbit fusion system of the ground station can obtain data from the ground public network through the communication link of the geostationary satellite.

[0097] Step 202: Based on the communication link of the geostationary satellite, obtain the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment from the ground public network.

[0098] Among them, the ground public network has information such as the GPS ephemeris of each satellite regularly released by the satellite company, the preset signal strength threshold for high-orbit satellite link establishment, and the signal strength threshold for low-orbit link establishment. As described in step 201, on the premise that the communication link of the geostationary satellite has been completed, in this embodiment, the high-low orbit fusion system of the ground station can obtain the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment from the ground public network through the communication link of the geostationary satellite.

[0099] In this embodiment, after monitoring that the ground station is powered on, track the geostationary satellite through the preset frequency band antenna to establish the communication link of the geostationary satellite; based on the communication link of the geostationary satellite, obtain the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment from the ground public network. Since the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment are obtained from the ground public network through the communication link of the geostationary satellite, the accuracy of data acquisition can be guaranteed.

[0100] As an alternative implementation, in this embodiment, step 102 includes the following steps:

[0101] Step 301: Based on the latest low-orbit ephemeris and the position information of the ground station, determine the time-varying trajectory map of the low-orbit satellite.

[0102] Among them, the position information of the ground station is determined by the GPS of the ground station. The time-varying trajectory map of the low-orbit satellite is a flight trajectory map that predicts the change of the low-orbit satellite relative to the ground station over time. The time-varying trajectory map of the low-orbit satellite includes the time points corresponding to the low-orbit satellite flying to multiple flight positions.

[0103] According to the latest low-orbit ephemeris and the position information of the ground station, the time-varying trajectory map of the low-orbit satellite can be obtained. The specific determination process belongs to the prior art and will not be elaborated here.

[0104] Step 302: Determine the satellite communication elevation angle at each of the flight positions in the time-varying trajectory map of the LEO satellite.

[0105] Specifically, according to each flight position in the time-varying trajectory map of the LEO satellite, the elevation angle at each flight position can be determined. Here, it refers to the satellite communication elevation angle at each flight position between the LEO satellite and the horizon where the ground station is located.

[0106] Step 303: Determine the time point corresponding to the flight position in the time-varying trajectory map of the LEO satellite where the minimum satellite communication elevation angle is located as the transit time of the LEO satellite.

[0107] Specifically, first determine the flight position corresponding to the minimum satellite communication elevation angle in the time-varying trajectory map of the LEO satellite, and then determine the time point corresponding to this flight position. This time point is the predicted transit time of the LEO satellite and is also the actual transit time of the LEO satellite.

[0108] In this embodiment, based on the latest LEO ephemeris and the position information of the ground station, the time-varying trajectory map of the LEO satellite is determined; wherein, the time-varying trajectory map of the LEO satellite is a flight trajectory map predicting the change of the LEO satellite relative to the ground station over time, and the time-varying trajectory map of the LEO satellite includes the time points corresponding to the LEO satellite flying to multiple flight positions; determine the satellite communication elevation angle at each of the flight positions in the time-varying trajectory map of the LEO satellite; determine the time point corresponding to the flight position in the time-varying trajectory map of the LEO satellite where the minimum satellite communication elevation angle is located as the transit time of the LEO satellite. Since the latest LEO ephemeris itself can accurately predict when it will fly to where, and then combined with the position information of the ground station to determine the transit time of the LEO satellite, the transit time of the LEO satellite is more accurate.

[0109] As an alternative implementation, in this embodiment, step 103 includes the following steps:

[0110] Step 401: Send the latest LEO ephemeris to the preset frequency band antenna so that the preset frequency band antenna tracks the LEO satellite.

[0111] Among them, when the high-low orbit fusion system of the ground station obtains the latest LEO ephemeris, it immediately sends it to the antenna controller, and the antenna controller controls the preset frequency band antenna to point to the LEO satellite according to the latest LEO ephemeris. After the preset frequency band antenna points to the LEO satellite, it can track and lock the LEO satellite to assist in completing the link establishment of the LEO satellite.

[0112] Step 402: Obtain the signal of the LEO satellite obtained through the preset frequency band antenna and determine the signal strength of the LEO satellite at the current moment.

[0113] Among them, during the process that the preset frequency band antenna tracks and locks the low-earth orbit satellite, the preset frequency band antenna can obtain the signal of the low-earth orbit satellite in real time, so as to obtain the signal strength of the low-earth orbit satellite at the current moment.

[0114] In this embodiment, the latest low-earth orbit ephemeris is sent to the preset frequency band antenna so that the preset frequency band antenna tracks the low-earth orbit satellite; the signal of the low-earth orbit satellite obtained through the preset frequency band antenna is acquired, and the signal strength of the low-earth orbit satellite at the current moment is determined. Since the signal strength of the low-earth orbit satellite at the current moment is acquired during the tracking process by the preset frequency band antenna, the accuracy of acquiring the signal strength of the low-earth orbit satellite can be guaranteed.

[0115] As an alternative embodiment, in this embodiment, the signal of the low-earth orbit satellite includes a satellite carrier signal and an interference signal in the transmission space; step 104 includes the following steps:

[0116] Step 501, determine whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment.

[0117] Among them, the signal strength of the low-earth orbit satellite refers to the signal strength of the low-earth orbit satellite at the current moment mentioned above, and the signal strength can be represented by a specific value. When determining whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment, the value of the signal strength of the low-earth orbit satellite at the current moment is compared with the value of the signal strength threshold for low-earth orbit link establishment to determine whether the signal strength of the low-earth orbit satellite reaches the minimum signal strength requirement for low-earth orbit link establishment.

[0118] Step 502, in response to the signal strength of the low-earth orbit satellite reaching the signal strength threshold for low-earth orbit link establishment, acquire the time point to be determined.

[0119] Among them, if the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment, it indicates that the communication link of the low-earth orbit satellite can be established currently. However, since the signal of the low-earth orbit satellite includes not only the satellite carrier signal but also the interference signal in the transmission space, when the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment, it is very likely that the signal strength of the satellite carrier of the actual low-earth orbit satellite does not reach the signal strength threshold for low-earth orbit link establishment, so it is also necessary to determine in combination with the low-earth orbit satellite transit time.

[0120] At this time, first record the time point to be determined, and the time point to be determined is the time point when the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment.

[0121] Step 503, determine whether the low-earth orbit satellite has transited according to the time point to be determined and the low-earth orbit satellite transit time.

[0122] Among them, at the time point to be determined, although the signal strength of the low-earth orbit satellite has reached the signal strength threshold for establishing a link with the low-earth orbit, as described above, it cannot be excluded that it is interfered by the interference signal in the transmission space, and the actual low-earth orbit satellite may not be passing by or may be passing by. Therefore, according to the time point to be determined and the passing time of the low-earth orbit satellite, it is determined whether the low-earth orbit satellite has passed by.

[0123] Step 504, in response to the passing of the low-earth orbit satellite, determine that the high-low orbit fusion system of the ground station meets the condition for switching to the communication link of the low-earth orbit satellite.

[0124] Among them, passing by includes the situation of passing by or having passed by but still being able to establish a link. If it is determined that the low-earth orbit satellite has passed by, it is determined that the high-low orbit fusion system of the ground station meets the condition for switching to the communication link of the low-earth orbit satellite.

[0125] In this embodiment, it is determined whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for establishing a link with the low-earth orbit; in response to the signal strength of the low-earth orbit satellite reaching the signal strength threshold for establishing a link with the low-earth orbit, the time point to be determined is obtained, and the time point to be determined is the time point when the signal strength of the low-earth orbit satellite reaches the signal strength threshold for establishing a link with the low-earth orbit; according to the time point to be determined and the passing time of the low-earth orbit satellite, it is determined whether the low-earth orbit satellite has passed by; in response to the passing of the low-earth orbit satellite, it is determined that the high-low orbit fusion system of the ground station meets the condition for switching to the communication link of the low-earth orbit satellite. Whether the condition for switching to the communication link of the low-earth orbit satellite is met is comprehensively judged by two factors: the passing time of the low-earth orbit satellite and the signal strength of the low-earth orbit satellite. In this way, it can be ensured that the low-earth orbit satellite switches to the communication link of the low-earth orbit satellite only when the signal strength meets the signal strength requirement for establishing a link with the low-earth orbit and when it is passing by, thereby effectively improving the availability of switching to the communication link of the low-earth orbit satellite.

[0126] Similarly, in another embodiment, it is also possible to detect whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for establishing a link with the low-earth orbit at the passing time of the low-earth orbit satellite.

[0127] As an alternative implementation manner, in this embodiment, the steps include the following steps:

[0128] Step 601, determine the time difference between the time point to be determined and the passing time of the low-earth orbit satellite.

[0129] Specifically, by subtracting the passing time of the low-earth orbit satellite from the time point to be determined, the time difference between the two can be determined. This time difference is a value greater than or equal to 0.

[0130] Step 602, in response to the time difference being less than or equal to the preset time difference, determine that the low-earth orbit satellite has passed by.

[0131] Among them, the preset time difference is pre-set in the fusion system of the ground station and can be set to 0 or close to 0. The closer it is to 0, the more accurate it is. When the time difference is greater than or equal to the preset time difference, it can be determined that the LEO satellite is in transit.

[0132] Step 603, in response to the time difference being greater than the preset time difference, determine that the LEO satellite is not in transit.

[0133] Among them, when the time difference is less than the preset duration, it can be determined that the LEO satellite has not yet transited and there is still a period of time until transit. The specific duration is the calculated time difference.

[0134] In this embodiment, determine the time difference between the to-be-determined time point and the transit time of the LEO satellite; in response to the time difference being less than or equal to the preset time difference, determine that the LEO satellite is in transit; in response to the time difference being greater than the preset time difference, determine that the LEO satellite is not in transit. Since determining whether the LEO satellite is in transit is based on comparing the time difference between the to-be-determined time point and the transit time of the LEO satellite with the preset time difference, it can accurately determine whether the LEO satellite is in transit.

[0135] In one embodiment, in response to the signal strength of the LEO satellite not reaching the signal strength threshold for LEO link establishment, the time point when the signal strength of the monitored LEO satellite is detected not to reach the signal strength threshold for LEO link establishment is determined as the to-be-confirmed time point. At the same time, according to this to-be-confirmed time point and the transit time of the LEO satellite, determine whether the LEO satellite is in transit. Specifically:

[0136] In response to the time difference between the to-be-confirmed time point and the transit time of the LEO satellite being less than or equal to the preset time difference, determine that the LEO satellite is in transit. Although the LEO transit time has been reached, due to poor signal strength, the communication link to the LEO satellite cannot be switched.

[0137] In response to the time difference between the to-be-confirmed time point and the transit time of the LEO satellite being greater than the preset time difference, determine that the LEO satellite is not in transit. At this time, the signal strength of the LEO satellite is poor and the LEO transit time has not yet been reached, so the communication link to the LEO satellite cannot be switched.

[0138] As an alternative implementation, in this embodiment, the high-low orbit fusion system of the ground station includes a preset frequency band antenna, a radio frequency switch, and a network switch; step 105 includes the following steps:

[0139] Step 701, in response to meeting the condition for switching to the communication link of the LEO satellite, control the preset frequency band antenna to adjust to track the LEO satellite.

[0140] Among them, when the high-low orbit fusion system of the ground station determines that the condition for switching to the communication link of the low-orbit satellite is met, it first sends an instruction to the preset frequency band antenna, such as the binary instruction 00. After receiving the instruction 00 according to the preset strategy, the preset frequency band antenna dynamically locks and tracks the low-orbit satellite.

[0141] Step 702, control the radio frequency switch to switch the baseband intermediate frequency signal of the high-orbit modem to the baseband intermediate frequency signal of the low-orbit modem.

[0142] Among them, afterwards, the high-low orbit fusion system of the ground station sends an instruction to the radio frequency switch, such as the binary instruction 00. After receiving the instruction 00 according to the preset strategy, the radio frequency switch switches the TX and RX intermediate frequency signals of the high-orbit modem at the input end to the TX and RX intermediate frequency signals of the low-orbit modem, completing the switching of the baseband intermediate frequency signal.

[0143] Step 703, control the network switch to switch the network signal of the high-orbit modem to the network signal of the low-orbit modem.

[0144] Among them, finally, the high-low orbit fusion system of the ground station sends an instruction to the network switch, such as the binary instruction 00. After receiving the instruction 00 according to the preset strategy, the network switch switches the network signal (i.e., the IP signal) of the LAN port of the high-orbit modem at the input end to the network signal (i.e., the IP signal) of the LAN port of the low-orbit modem, completing the switching of the network signal for the application layer.

[0145] Step 704, when the network switch completes the switching of the network signal, determine that the step of switching the communication link of the high-orbit satellite to the communication link of the low-orbit satellite is completed.

[0146] In this embodiment, in response to meeting the condition for switching to the communication link of the low-orbit satellite, control the preset frequency band antenna to adjust to track the low-orbit satellite; control the radio frequency switch to switch the baseband intermediate frequency signal of the high-orbit modem to the baseband intermediate frequency signal of the low-orbit modem; control the network switch to switch the network signal of the high-orbit modem to the network signal of the low-orbit modem; when the network switch completes the switching of the network signal, determine that the step of switching the communication link of the high-orbit satellite to the communication link of the low-orbit satellite is completed. Since the specific process of switching from the communication link of the high-orbit satellite to the communication link of the low-orbit satellite is completely automatically controlled by the high-low orbit fusion system of the ground station to implement the preset frequency band antenna, radio frequency switch, network switch, etc., therefore, no manual participation is required, and the efficiency of switching to the communication link of the low-orbit satellite can be improved.

[0147] As an alternative implementation, in this embodiment, after step 105, the satellite communication link switching method further includes the following steps:

[0148] Step 801, obtain a data acquisition request of the user terminal through the network switch.

[0149] Among them, the data acquisition request can be understood as an IP stream, which includes the data to be acquired. The data to be acquired can be any data that can be obtained from the terrestrial public network, such as video stream data.

[0150] Step 802, modulate and demodulate the data acquisition request through the low-earth-orbit modulator-demodulator to obtain a processed data acquisition request.

[0151] Among them, the processed data acquisition request is an IP stream suitable for transmission through the communication link of the low-earth-orbit satellite.

[0152] The low-earth-orbit modulator-demodulator first modulates the data acquisition request, so that the data acquisition request changes from an IP stream to an information stream suitable for transmission through the communication link of the low-earth-orbit satellite, and then demodulates it, so that the information stream obtained after modulation is transformed into an IP stream suitable for transmission through the communication link of the low-earth-orbit satellite.

[0153] Step 803, transmit the processed data acquisition request through the communication link of the low-earth-orbit satellite to the terrestrial public network through the preset frequency band antenna, so as to obtain the data to be acquired from the terrestrial public network and transmit it back to the user terminal.

[0154] Specifically, finally, the processed data acquisition request is transmitted through the communication link of the low-earth-orbit satellite to the terrestrial public network through the preset frequency band antenna, so as to obtain the data to be acquired from the terrestrial public network and transmit it back to the user terminal, so that the user terminal can obtain the data to be acquired.

[0155] In this embodiment, a data acquisition request of the user terminal is obtained through the network switch, and the data acquisition request includes the data to be acquired; the data acquisition request is modulated and demodulated through the low-earth-orbit modulator-demodulator to obtain a processed data acquisition request, and the processed data acquisition request is an IP stream suitable for transmission through the communication link of the low-earth-orbit satellite; the processed data acquisition request is transmitted through the communication link of the low-earth-orbit satellite to the terrestrial public network through the preset frequency band antenna, so as to obtain the data to be acquired from the terrestrial public network and transmit it back to the user terminal. Since after switching the communication link of the geostationary satellite to the communication link of the low-earth-orbit satellite, the user terminal can communicate with the terrestrial public network through the communication link of the low-earth-orbit satellite for data transmission, the communication advantage of the low-earth-orbit satellite can be utilized to improve the data acquisition rate, thereby also improving the user experience.

[0156] In one embodiment, the high-low orbit integration system of the ground station can also automatically switch the communication link of the low-orbit satellite to that of the high-orbit satellite. That is, during the operation in the low-orbit mode, the switching control unit can predict and determine the time point of low-orbit link disconnection according to the aforementioned latest low-orbit ephemeris. When the time point of low-orbit link disconnection is reached, the switching control unit will send corresponding switching instructions to the preset frequency band antenna, RF switch, and network switch respectively. Specifically:

[0157] Step 1: Send an instruction to the preset frequency band antenna, such as the binary instruction 01. After receiving the instruction 01 according to the preset strategy, the preset frequency band antenna dynamically locks and tracks the high-orbit satellite.

[0158] Step 2: Send an instruction to the RF switch, such as the binary instruction 01. After receiving the instruction 01 according to the preset strategy, the switch switches the TX and RX intermediate frequency signals of the low-orbit modem at the input end to the TX and RX intermediate frequency signals of the high-orbit modem, completing the switching of the baseband intermediate frequency signals.

[0159] Step 3: Send an instruction to the network switch, such as the binary instruction 01. After receiving the instruction 01 according to the preset strategy, the network switch switches the network signal (i.e., IP signal) of the LAN port of the low-orbit modem at the input end to the network signal (i.e., IP signal) of the LAN port of the high-orbit modem, completing the switching of the network signal for the application layer.

[0160] In this embodiment, when the time point of low-orbit link disconnection is reached, the high-low orbit integration system of the ground station automatically switches the communication link of the low-orbit satellite to that of the high-orbit satellite without manual switching, so it is not easy to cause data loss.

[0161] Figure 6 It is a schematic structural diagram of a satellite communication link switching device provided by an embodiment of the present application. As Figure 6 shown, the satellite communication link switching device 40 provided in this embodiment is located in the high-low orbit integration system of the ground station. Then, the satellite communication link switching device 40 provided in this embodiment includes:

[0162] A data acquisition module 41, configured to acquire the latest low-orbit ephemeris and the preset signal strength threshold for low-orbit link establishment;

[0163] A time determination module 42, configured to determine the low-orbit satellite transit time according to the latest low-orbit ephemeris; the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to the minimum satellite communication elevation angle between the ground station's horizon; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing the communication link of the low-orbit satellite;

[0164] A signal strength acquisition module 43 for acquiring the signal strength of a low-earth orbit satellite at the current moment;

[0165] A condition judgment module 44 for judging whether the condition for switching to the communication link of the low-earth orbit satellite is met according to the transit time of the low-earth orbit satellite and the signal strength of the low-earth orbit satellite;

[0166] A low-earth orbit link switching module 45 for switching the communication link of the geostationary orbit satellite to the communication link of the low-earth orbit satellite in response to meeting the condition for switching to the communication link of the low-earth orbit satellite.

[0167] Optionally, the data acquisition module 41 is specifically configured to: after detecting that the ground station is powered on, track the geostationary orbit satellite through a preset frequency band antenna to establish a communication link with the geostationary orbit satellite; based on the communication link with the geostationary orbit satellite, obtain the latest low-earth orbit ephemeris and a preset signal strength threshold for low-earth orbit link establishment from the ground public network.

[0168] Optionally, the time determination module 42 is specifically configured to: based on the latest low-earth orbit ephemeris and the position information of the ground station, determine the time-varying trajectory map of the low-earth orbit satellite; wherein, the time-varying trajectory map of the low-earth orbit satellite is a predicted flight trajectory map of the low-earth orbit satellite relative to the ground station over time, and the time-varying trajectory map of the low-earth orbit satellite includes the time points corresponding to the low-earth orbit satellite flying to multiple flight positions; determine the satellite communication elevation angle at each of the flight positions in the time-varying trajectory map of the low-earth orbit satellite; and determine the time point corresponding to the flight position in the time-varying trajectory map of the low-earth orbit satellite where the minimum satellite communication elevation angle is located as the transit time of the low-earth orbit satellite.

[0169] Optionally, the signal strength acquisition module 43 is specifically configured to: send the latest low-earth orbit ephemeris to the preset frequency band antenna to enable the preset frequency band antenna to track the low-earth orbit satellite; acquire the signal of the low-earth orbit satellite obtained through the preset frequency band antenna, and determine the signal strength of the low-earth orbit satellite at the current moment.

[0170] Optionally, the signal of the low-earth orbit satellite includes a satellite carrier signal and an interference signal in the transmission space; the condition judgment module 44 is specifically configured to: judge whether the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment; in response to the signal strength of the low-earth orbit satellite reaching the signal strength threshold for low-earth orbit link establishment, acquire a time point to be determined, where the time point to be determined is the time point when the signal strength of the low-earth orbit satellite reaches the signal strength threshold for low-earth orbit link establishment; judge whether the low-earth orbit satellite has transited according to the time point to be determined and the transit time of the low-earth orbit satellite; and in response to the low-earth orbit satellite having transited, determine that the high-low-earth orbit fusion system of the ground station meets the condition for switching to the communication link of the low-earth orbit satellite.

[0171] Optionally, when determining whether the LEO satellite passes by according to the time point to be determined and the LEO satellite passing time, the condition judgment module 44 is specifically configured to: determine the time difference between the time point to be determined and the LEO satellite passing time; in response to the time difference being less than or equal to a preset time difference, determine that the LEO satellite passes by; in response to the time difference being greater than the preset time difference, determine that the LEO satellite does not pass by.

[0172] Optionally, the high-low orbit fusion system of the ground station includes a preset frequency band antenna, a radio frequency switch, and a network switch. The LEO link switching module 45 is specifically configured to: in response to meeting the condition for switching to the communication link of the LEO satellite, control the preset frequency band antenna to adjust to track the LEO satellite; control the radio frequency switch to switch the baseband intermediate frequency signal of the high orbit modulator-demodulator to the baseband intermediate frequency signal of the LEO orbit modulator-demodulator; control the network switch to switch the network signal of the high orbit modulator-demodulator to the network signal of the LEO orbit modulator-demodulator; when the network switch completes the switching of the network signal, determine that the step of switching the communication link of the GEO satellite to the communication link of the LEO satellite is completed.

[0173] Optionally, the satellite communication link switching device further includes an application module, which is specifically configured to: after switching the communication link of the GEO satellite to the communication link of the LEO satellite, obtain a data acquisition request of the user terminal through the network switch, where the data acquisition request includes data to be acquired; modulate and demodulate the data acquisition request through the LEO orbit modulator-demodulator to obtain a processed data acquisition request, where the processed data acquisition request is an IP stream suitable for transmission through the communication link of the LEO satellite; transmit the processed data acquisition request to the ground public network through the communication link of the LEO satellite through the preset frequency band antenna, so as to obtain the data to be acquired from the ground public network and transmit it back to the user terminal.

[0174] Figure 7 is a block diagram of a high-low orbit fusion system of a ground station shown according to an exemplary embodiment. The device may be as Figure 7 shown. The high-low orbit fusion system of the ground station includes: a memory 51, a processor 52, and a transceiver 54; the transceiver 54 is used for transmitting data and instructions; the memory 51 is a memory for storing instructions executable by the processor; the processor 52 is used for running a computer program or instructions to implement the satellite communication link switching method provided in any one of the above embodiments.

[0175] Among them, the memory 51 is used to store programs. Specifically, the program may include program codes, and the program codes include computer operation instructions. The memory 51 may include high-speed RAM memory and may also include non-volatile memory, such as at least one disk memory.

[0176] Among them, the processor 52 may be a central processing unit (CPU for short), or an application specific integrated circuit (ASIC for short), or one or more integrated circuits configured to implement the embodiments of the present disclosure.

[0177] Optionally, in specific implementation, if the memory 51, the processor 52, and the transceiver 54 are implemented independently, the memory 51, the processor 52, and the transceiver 54 may be interconnected through a bus 53 to complete communication with each other. The bus 53 may be an industry standard architecture (ISA) bus 53, a peripheral component interconnect (PCI) bus 53, or an extended industry standard architecture (EISA) bus 53, etc. The bus 53 may be divided into an address bus 53, a data bus 53, a control bus 53, etc. For the convenience of representation, Figure 7 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus 53 or one type of bus 53.

[0178] Optionally, in specific implementation, if the memory 51, the processor 52, and the transceiver 54 are integrated on a chip, the memory 51, the processor 52, and the transceiver 54 may complete communication with each other through an internal interface.

[0179] A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the high-low orbit fusion system of the ground station, enables the high-low orbit fusion system of the ground station to execute the satellite communication link switching method of the high-low orbit fusion system of the ground station as described above.

[0180] Other embodiments of the present application will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only illustrative, and the true scope and spirit of the present application are pointed out by the following claims.

[0181] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A satellite communication link switching method, characterized in that, A high-low orbit integration system applied to a ground station, the method comprising: Obtain the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment; Determine the low-orbit satellite transit time according to the latest low-orbit ephemeris; the low-orbit satellite transit time is the time corresponding to when the low-orbit satellite flies to an elevation angle between the ground station's horizon and the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing a communication link with the low-orbit satellite; Obtain the signal strength of the low-orbit satellite at the current moment; Judge whether the condition for switching to the communication link of the low-orbit satellite is met according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite; In response to meeting the condition for switching to the communication link of the low-orbit satellite, switch the communication link of the high-orbit satellite to the communication link of the low-orbit satellite.

2. The method according to claim 1, wherein The obtaining the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment includes: After detecting that the ground station is powered on, track the high-orbit satellite through a preset frequency band antenna to establish a communication link with the high-orbit satellite; Based on the communication link of the high-orbit satellite, obtain the latest low-orbit ephemeris and a preset signal strength threshold for low-orbit link establishment from the ground public network.

3. The method according to claim 1, wherein The determining the low-orbit satellite transit time according to the latest low-orbit ephemeris includes: Determine the time-varying trajectory map of the low-orbit satellite based on the latest low-orbit ephemeris and the position information of the ground station; wherein, the time-varying trajectory map of the low-orbit satellite is a predicted flight trajectory map of the low-orbit satellite relative to the ground station over time, and the time-varying trajectory map of the low-orbit satellite includes the time points corresponding to when the low-orbit satellite flies to multiple flight positions; Determine the satellite communication elevation angle at each of the flight positions in the time-varying trajectory map of the low-orbit satellite; Determine the time point corresponding to the flight position in the time-varying trajectory map of the low-orbit satellite where the minimum satellite communication elevation angle is located as the low-orbit satellite transit time.

4. The method according to claim 1, wherein The obtaining the signal strength of the low-orbit satellite at the current moment includes: Send the latest low-orbit ephemeris to a preset frequency band antenna so that the preset frequency band antenna tracks the low-orbit satellite; Obtain the signal of the low-orbit satellite obtained through the preset frequency band antenna, and determine the signal strength of the low-orbit satellite at the current moment.

5. The method according to claim 4, characterized in that, The signal of the low-orbit satellite includes a satellite carrier signal and an interference signal in the transmission space; Then the judging whether the condition for switching to the communication link of the low-orbit satellite is met according to the low-orbit satellite transit time and the signal strength of the low-orbit satellite includes: Judge whether the signal strength of the low-orbit satellite reaches the signal strength threshold for low-orbit link establishment; In response to the signal strength of the low-orbit satellite reaching the signal strength threshold for low-orbit link establishment, obtain a time point to be determined, where the time point to be determined is the time point when the signal strength of the low-orbit satellite reaches the signal strength threshold for low-orbit link establishment; Judge whether the low-orbit satellite has transited according to the time point to be determined and the low-orbit satellite transit time; In response to the low-orbit satellite transiting, determine that the high-low orbit integration system of the ground station meets the condition for switching to the communication link of the low-orbit satellite.

6. The method according to claim 5, wherein Determining whether the LEO satellite passes by according to the to-be-determined time point and the LEO satellite passing time includes: Determining the time difference between the to-be-determined time point and the LEO satellite passing time; In response to the time difference being less than or equal to a preset time difference, determining that the LEO satellite passes by; In response to the time difference being greater than the preset time difference, determining that the LEO satellite does not pass by.

7. The method according to any one of claims 1-2, characterized in that, The high-low orbit fusion system of the ground station includes a preset frequency band antenna, a radio frequency switch, and a network switch. Responding to meeting the condition for switching to the communication link of the LEO satellite and switching the communication link of the GEO satellite to the communication link of the LEO satellite includes: In response to meeting the condition for switching to the communication link of the LEO satellite, controlling the preset frequency band antenna to adjust to track the LEO satellite; Controlling the radio frequency switch to switch the baseband intermediate frequency signal of the GEO satellite's modulator-demodulator to the baseband intermediate frequency signal of the LEO satellite's modulator-demodulator; Controlling the network switch to switch the network signal of the GEO satellite's modulator-demodulator to the network signal of the LEO satellite's modulator-demodulator; When the network switch completes the switching of the network signal, determining that the step of switching the communication link of the GEO satellite to the communication link of the LEO satellite is completed.

8. The method according to claim 7, wherein After switching the communication link of the GEO satellite to the communication link of the LEO satellite, it further includes: Obtaining a data acquisition request of the user terminal through the network switch, where the data acquisition request includes data to be acquired; Modulating and demodulating the data acquisition request through the LEO satellite's modulator-demodulator to obtain a processed data acquisition request, and the processed data acquisition request is an IP stream suitable for transmission through the communication link of the LEO satellite; Transmitting the processed data acquisition request to the ground public network through the communication link of the LEO satellite through the preset frequency band antenna to obtain the data to be acquired from the ground public network and backhaul it to the user terminal.

9. A satellite communication link switching device, characterized in that, A high-low orbit fusion system located at the ground station, the device includes: A data acquisition module, configured to acquire the latest LEO satellite ephemeris and a preset signal strength threshold for LEO satellite link establishment; A time determination module, configured to determine the LEO satellite passing time according to the latest LEO satellite ephemeris; the LEO satellite passing time is the time corresponding to when the LEO satellite flies to an elevation angle between the ground station's horizon and the minimum satellite communication elevation angle; the minimum satellite communication elevation angle is the satellite communication elevation angle for establishing the communication link of the LEO satellite; A signal strength acquisition module, configured to acquire the signal strength of the LEO satellite at the current moment; A condition judgment module, configured to judge whether the condition for switching to the communication link of the LEO satellite is met according to the LEO satellite passing time and the signal strength of the LEO satellite; A LEO link switching module, configured to switch the communication link of the GEO satellite to the communication link of the LEO satellite in response to meeting the condition for switching to the communication link of the LEO satellite.

10. A high-low orbit integration system for a ground station, comprising: A transceiver, a processor, and a memory communicatively connected to the processor; The transceiver is configured to transmit data and instructions; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, Computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, they are used to implement the method according to any one of claims 1-8.

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