Inter-satellite link communication method, system, device and product for constellation networking

Abstract

The invention discloses an inter-satellite link communication method, system, device and product for constellation networking, the method is used for realizing communication connection of two on-orbit satellites for constellation networking, and the method comprises the following steps: for any one inter-satellite link connecting the two on-orbit satellites, one on-orbit satellite is set as a main satellite, and the other on-orbit satellite is set as an auxiliary satellite; the other on-orbit satellite is set as a slave satellite; when the inter-satellite link is established, the master satellite sends a test signal to the slave satellite, the current channel state is collected and evaluated through the inter-satellite link, the channel is regulated and controlled according to the evaluation result, channel regulation and control parameters are sent to the slave satellite, and the slave satellite carries out regulation and control matched with the master satellite on the channel according to the channel regulation and control parameters. According to the invention, state monitoring and dynamic regulation and control can be carried out on channels of inter-satellite links of large-scale constellation networking, and the communication quality and the system reliability are improved.

Description

Technical Field

[0001] The present application relates to the field of space communication technologies, and particularly relates to an inter-satellite link communication method, system, device, and product for constellation networking. Background Art

[0002] With the construction of high-density and large-scale constellations, the demand for high-bandwidth and large-capacity space communication is increasing day by day. There are mainly two modes of space communication: the satellite-Earth link transmission mode, in which all information exchanges are completed at the ground gateway station, and the satellite does not act as an information relay medium. The satellite-satellite link transmission mode, i.e., the inter-satellite link mode, can realize direct information interaction between satellites. This mode can reduce the number of transmission "hops", reduce the end-to-end delay of satellite transmission and the dependence on the ground network, and achieve wide-area network coverage. It is a key technology for the development of satellite Internet.

[0003] The following problems exist in the conventional inter-satellite link communication between space satellites. Affected by various factors such as orbital motion, Doppler frequency shift, and co-frequency interference from other satellite systems, the channel state of the inter-satellite link continuously changes, such as path loss, delay, signal-to-noise ratio, etc., which will lead to an increase in the demodulation error rate in communication and affect the communication quality; in order to enhance the signal reception strength and maintain high-power operation at the transmitting end, if the EIRP in the Ka band is not dynamically regulated, it will lead to an increase in satellite energy consumption and shorten the on-orbit life. Therefore, monitoring and regulating the inter-satellite link communication is a necessary means to improve communication quality and system stability. The conventional regulation method for the inter-satellite link realizes channel regulation for the inter-satellite link between specific companion binary stars and is not applicable to the regulation of large-scale constellation networking. Summary of the Invention

[0004] The purpose of the present application is to overcome the deficiencies of the prior art and provide an inter-satellite link communication method, system, device, and product for constellation networking, which can realize the state monitoring and dynamic regulation of the channels of the inter-satellite links of large-scale constellation networking and improve communication quality and system reliability.

[0005] In a first aspect, an inter-satellite link communication method for constellation networking provided by the present application is used to realize the communication connection between two on-orbit satellites of constellation networking, and adopts the following technical solution: For any inter-satellite link connecting two on-orbit satellites, one on-orbit satellite is set as the master satellite, and the other on-orbit satellite is set as the slave satellite; when establishing the inter-satellite link, the master satellite sends a test signal to the slave satellite to establish a channel, collects and evaluates the current channel state, regulates the channel according to the evaluation result, and sends channel regulation parameters to the slave satellite. The slave satellite regulates the channel to be adapted to the master satellite according to the channel regulation parameters.

[0006] By adopting the above technical solution, an inter-satellite link is composed of a master satellite and a slave satellite. The master satellite is used to monitor, evaluate, and regulate the channel, while the slave satellite cooperates with the master satellite for adaptive regulation. For a large-scale constellation composed of a large number of satellites, the large number of channels formed by each inter-satellite link can achieve autonomous monitoring and regulation of the channel in orbit without relying on ground regulation, and the regulation will not be interfered by the inter-satellite links of other satellites in the constellation.

[0007] Preferably, the constellation networking is divided into a master control satellite and ordinary satellites. For any inter-satellite link connecting the master control satellite and an ordinary satellite, the master control satellite is the master satellite and the ordinary satellite is the slave satellite; for any inter-satellite link connecting two ordinary satellites, the ordinary satellite relatively closer to the nearest master control satellite is the master satellite, and the other ordinary satellite is the slave satellite.

[0008] Through the above technical solution, a clear distinction between the master satellite and the slave satellite on the inter-satellite link is provided, thereby realizing the allocation of tasks for channel monitoring, evaluation, and regulation, and enabling the effective implementation of communication tasks.

[0009] Preferably, the specific steps for the master satellite to collect and evaluate the current channel state include: S100, collect the current channel state parameters; S200, perform normalization processing on the channel state parameters, establish a scoring model, and score the channel state parameters; S300, classify the service types of the signal transmission on the inter-satellite link, allocate weights to the channel state parameters according to the service types, and calculate the comprehensive score of the current channel state through weighted calculation; S400, determine whether channel regulation is required based on the channel state parameter score, the comprehensive channel state score, and the service type, and then determine the channel regulation parameters.

[0010] Preferably, in S100, the channel state parameters include signal-to-noise ratio, bit error rate, link load rate, delay, and jitter; Among them, the signal-to-noise ratio is obtained by measuring the received signal power and the noise power, and there is: In the formula, SNR(dB) is the signal-to-noise ratio, p signal is the measured received signal power, P noi is the noise power; The bit error rate is calculated by the number of error codes in the encoding and decoding processes of the error correction code, and there is: In the formula, BER is the bit error rate; The link load rate is calculated by the ratio of the data volume transmitted within a unit time to the maximum channel capacity, and there is: The time delay sends a timestamp signal through the inter-satellite link to calculate the propagation delay, and there is: In the formula, RTT is the signal round-trip propagation time; The jitter is measured based on calibrating the clock deviation by a cesium atomic clock or a light speed delay measurement, and there is: In the formula, N is the total number of measured data packets, t k is the arrival time of the kth data packet, and ΔT ideal is the ideal transmission interval time.

[0011] Preferably, the specific method for S200 to score the state is: Map each parameter to the range of 0 - 100 points; Signal-to-noise ratio score: SNR(dB) ≥ 20dB gets full marks, and 15 points are deducted for every 5dB reduction; Bit error rate score: BER ≤ 10-8 gets full marks, and 20 points are deducted for each order of magnitude increase; Link load rate score: Link load rate ≤ 70% gets full marks, and 25 points are deducted for every 5% excess; Time delay and jitter score: Time delay ≤ 20ms and jitter ≤ 1ms get full marks, and 10 points are deducted for each detection exceeding the threshold.

[0012] Through the above technical solutions, a specific implementation plan for collecting and evaluating the current channel state is provided. Taking the signal-to-noise ratio, bit error rate, link load rate, time delay and jitter as the evaluation criteria for the channel state, the current channel state can be accurately evaluated, and the real-time regulation of the channel state can be enabled according to the channel state parameters.

[0013] Preferably, in S300, the specific service types of the inter-satellite link are divided into precise measurement tasks, real-time data transmission tasks, large-capacity relay tasks, network management tasks and cooperative networking tasks.

[0014] Through the above technical solutions, the specific service types of the inter-satellite link are distinguished. Different service types have different requirements for the channel state. By adopting the channel state evaluation criteria adapted to the service type, the communication reliability can be improved, and the use efficiency of system resources can be enhanced.

[0015] In a second aspect, an inter-satellite link communication system for constellation networking provided by the present application includes a sending module, a monitoring module, and a receiving module; the sending module of the main satellite sends a test signal to the receiving module of the slave satellite to form a channel, and monitors and evaluates the current channel state through the monitoring module, regulates the sending module according to the evaluation situation, sends the regulation parameters to the receiving module of the slave satellite, and the slave satellite adaptively regulates the receiving module according to the regulation parameters.

[0016] Preferably, the sending module is a laser signal sending module, and the receiving module is a laser signal receiving module.

[0017] In a third aspect, the present application provides a computer device, including a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned inter-satellite link communication method for constellation networking are implemented.

[0018] In a fourth aspect, the present application provides a computer program product, the computer program product includes a computer program or instruction, and enables the computer program or instruction to implement the steps in the above-mentioned inter-satellite link communication method for constellation networking.

[0019] In summary, the present application includes at least one of the following beneficial technical effects: 1. For large-scale constellation networking, the present application simplifies the complex inter-satellite link connection relationship into inter-satellite link units of each double-satellite system defined by the main satellite and the slave satellite, and regulates with the inter-satellite link unit as the target, simplifying the implementation of the regulation strategy; 2. The channel regulation strategy of the present application is gradually advanced from the master control satellite to the ordinary satellite, from the direction close to the master control satellite to the direction far from the master control, making the regulation process of the system proceed step by step, reducing the high-frequency concurrent regulation of each inter-satellite link in the whole domain, reducing the possibility of conflicts in the system, and improving the communication stability of the system; 3. The present application monitors the channel state through multiple data such as signal-to-noise ratio, bit error rate, link load rate, delay and jitter, can accurately judge the channel state, and accordingly conducts effective regulation of the channel, improves the channel performance, improves the signal transmission quality and transmission speed, improves the channel resource utilization rate, reduces the systematic risk, and improves the communication quality.

[0020] 4. By distinguishing different service types and providing a channel state evaluation criterion and regulation logic matching the service type, the present application can make the regulation more accurate, further improving the communication stability and the efficiency of the system. Description of the Drawings

[0021] Figure 1 It is the method flow chart of the inter-satellite link communication method for constellation networking in the embodiment of the present application; Figure 2Schematic diagram of the process for the main satellite in the embodiment of the present application to collect and evaluate the current channel state; Figure 3 Schematic block diagram of the inter-satellite link communication system for constellation networking in the embodiment of the present application; Figure 4 Block diagram of the computer device structure in the embodiment of the present application. Detailed implementation manners

[0022] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this embodiment as needed, but as long as it is within the scope of the present application, it is protected by the patent law.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application. It should be noted that in the optional embodiments of the present application, for relevant data such as object information, when the embodiments in the present application are applied to specific products or technologies, object permission or consent needs to be obtained, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions. That is to say, if the embodiments of the present application involve data related to objects, it needs to be obtained with the authorization and consent of the objects, the authorization and consent of relevant departments, and in compliance with the relevant laws, regulations, and standards of relevant countries and regions. In the embodiments, if personal information is involved, the acquisition of all personal information needs to obtain the consent of the individual. If sensitive information is involved, the separate consent of the information subject needs to be obtained, and the embodiments also need to be implemented with the authorization and consent of the object.

[0024] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the specification.

[0025] The currently commonly used methods for channel monitoring and regulation of inter-satellite links are mostly designed based on the double-satellite link with fixed orbital parameters, and mainly achieve stable and reliable channel docking by physically adjusting the flight attitude of the constellation and the communication module settings. Such a method has significant limitations when dealing with large-scale constellation networking systems. In large-scale constellations, the number of satellite nodes surges (such as a low-earth orbit constellation with tens of thousands of satellites), the complexity of orbital plane intersections and relative satellite motions, and the complexity of channel states increase exponentially. Any regulation of the double-satellite system will affect the system, resulting in the regulation developing in an uncertain direction. Therefore, it is necessary to simplify the channel regulation strategy for large-scale constellation systems through control logic.

[0026] In one embodiment, refer to Figure 1 , a method for inter-satellite link communication in a constellation networking of the present application, which is used to establish a communication connection between two on-orbit satellites in a constellation networking, specifically includes the following steps: First, for any inter-satellite link connecting two on-orbit satellites, one on-orbit satellite is designated as the master satellite, and the other on-orbit satellite is designated as the slave satellite. By distinguishing the master satellite and the slave satellite of the inter-satellite link, the subject of channel monitoring and the direction of regulation can be ensured. Only the master satellite performs regulation, avoiding a significant increase in the uncertainty of regulation caused by each of the two satellites performing regulation separately. For different inter-satellite links, the same satellite may be either the master satellite or the slave satellite, depending on the relative position of this satellite with respect to the other satellite on the inter-satellite link. However, since for any given inter-satellite link, the relative position relationship between the two satellites is fixed at the same time, for any given inter-satellite link, the identities of the master and slave satellites of the satellite are also fixed, and will not affect or interfere with the determination of the identities of the master and slave satellites of other inter-satellite links, thus enabling the regulation direction to have certainty. This certainty is not only the certainty between the two satellites of the inter-satellite link, but also the certainty of the large-scale regulation direction in the entire constellation networking system. The specific relative position relationship of the on-orbit satellites can be determined through ephemeris.

[0027] Then, when establishing the inter-satellite link, the master satellite sends a test signal to the slave satellite to establish a channel, and collects and evaluates the current channel state.

[0028] Finally, the master satellite regulates the channel according to the evaluation result, and sends channel regulation parameters to the slave satellite. The slave satellite regulates the channel to be adapted to the master satellite according to the channel regulation parameters.

[0029] Specifically, the constellation networking includes a master satellite and ordinary satellites. For any inter-satellite link connecting the master satellite and an ordinary satellite, the master satellite is the primary satellite and the ordinary satellite is the secondary satellite. For any inter-satellite link connecting two ordinary satellites, the ordinary satellite closer to the nearest master satellite is the primary satellite, and the other ordinary satellite is the secondary satellite. Usually, in a constellation networking, a geostationary earth orbit (GEO) or medium earth orbit (MEO) satellite serves as the master satellite, equipped with an inter-satellite link management unit. In addition, the polar orbit intersection satellite is at a key connection node of the constellation system and also serves as the master satellite. While the low earth orbit (LEO) broadband satellite is an ordinary satellite, focusing on user access and data transmission. Through the above method of identifying the primary and secondary satellites, the logical chain for regulating the inter-satellite link channel is initiated by the master satellite and advances from the master satellite towards the ordinary satellite away from the master satellite, enabling the regulation process of the channel to proceed step by step and gradually spread from the master satellite in the away direction, reducing the impact of global sudden high-frequency concurrent regulation on communication quality, giving the system buffer time and space, reducing the possibility of conflicts in regulation instructions, and enhancing the communication stability of the system.

[0030] In another embodiment, please refer to Figure 2 , the specific steps for the primary satellite to collect and evaluate the current channel state include: S100, collect the current channel state parameters; S200, perform normalization processing on the channel state parameters, establish a scoring model, and score the channel state parameters; S300, classify the service types of the inter-satellite link signal transmission, allocate weights to the channel state parameters according to the service types, and calculate the comprehensive score of the current channel state through weighted calculation; S400, based on the channel state parameter score, comprehensive score, and service type, determine whether the channel needs to be regulated, and then determine the channel regulation parameters.

[0031] More specifically, in another embodiment, in S100, the current channel state parameters include signal-to-noise ratio, bit error rate, link load rate, delay, and jitter.

[0032] The signal-to-noise ratio is used to quantify the power difference between the signal and the noise, reflecting the anti-interference ability of the channel. A high signal-to-noise ratio indicates small channel loss, strong signal penetration, and good channel state. A high SNR supports higher-order modulation coding to improve the transmission rate, while a low SNR requires switching to a lower-order coding method with stronger robustness.

[0033] The signal-to-noise ratio is obtained by measuring the received signal power and the noise power, and there is: In the formula, SNR(dB) is the signal-to-noise ratio, psignal For measuring the received signal power, P noi is the noise power.

[0034] The bit error rate (BER) is used to measure the error ratio of data during transmission and directly reflects the communication reliability. BER calculates the number of error codes through the encoding and decoding processes of error correction codes. When constellation systems are densely networked, the sidelobe interference of multiple satellites will form superimposed noise, significantly increasing the BER. Different application scenarios of different service types require different tolerance thresholds for BER. As shown in the following formula: The link load rate monitors the occupancy of channel resources. When the link load rate approaches or exceeds the threshold, it indicates that the channel resources are approaching exhaustion, and problems such as a sharp increase in transmission delay, an increase in packet loss rate, and a decrease in system stability may occur. The link load rate is calculated by the ratio of the data volume transmitted per unit time to the maximum capacity of the channel, and there is: The delay and jitter are used to evaluate the timeliness and stability of signal transmission and are crucial for real-time communication.

[0035] The delay directly reflects the physical span of the link. If the measured value exceeds the theoretical range, it may imply orbit perturbation or antenna pointing deviation. In high-load links, the processing delay will increase non-linearly, and the sampling point offset caused by the Doppler frequency shift (such as a 548 MHz frequency offset) will further exacerbate the delay fluctuation. The delay is calculated by sending a timestamp signal through the inter-satellite link and calculating the propagation delay, and there is: In the formula, RTT is the signal round-trip propagation time.

[0036] Jitter causes the phase offset of the clock signal. When using high-order modulation, the reduction of the constellation point spacing makes the system less tolerant of jitter. For example, the jitter tolerable by QPSK modulation is greater than that allowed by 16-QAM. Jitter is measured based on calibrating the clock deviation by a cesium atomic clock or measuring the light speed delay, and there is: In the formula, N is the total number of measured data packets, t k is the arrival time of the kth data packet, and ΔT ideal is the ideal transmission interval time.

[0037] Through the combination of the above multi-source data, the limitations of single indicators are broken through, and an all-round evaluation from physical channel characteristics to network behavior and from static parameters to dynamic perturbations is achieved. The multi-source data evaluation system of this application not only supports real-time channel state monitoring but also provides data support for the adaptive optimization of inter-satellite links.

[0038] More specifically, in another embodiment, the specific method for S200 to score the status is as follows: Map each parameter to the range of 0 - 100 points; Signal-to-noise ratio score: SNR(dB) ≥ 30dB gets full marks, and 15 points are deducted for every 5dB decrease; Bit error rate score: BER ≤ 10-8 gets full marks, and 20 points are deducted for every one-order-of-magnitude increase; Link load rate score: Link load rate ≤ 70% gets full marks, and 25 points are deducted for every 5% excess; Latency and jitter score: Latency ≤ 20ms and jitter ≤ 1ms get full marks, and 10 points are deducted for each detection exceeding the threshold.

[0039] By calculating the weighted scores of each parameter, the comprehensive score of the current channel status is finally obtained.

[0040] More specifically, in one embodiment, in S300, the specific service types of the inter-satellite link are divided into precise measurement tasks, real-time data transmission tasks, large-capacity relay tasks, network management tasks, and collaborative networking tasks.

[0041] The tolerance levels of different service type scenarios for signal-to-noise ratio, bit error rate, link load rate, latency, and jitter parameters are different. The following is a specific description: Precise measurement tasks, including tasks such as satellite autonomous orbit determination through inter-satellite two-way ranging and time synchronization, and high-precision spatio-temporal reference maintenance tasks. Such tasks require high-precision ranging and time synchronization, so they have high latency weights, high bit error rate weights (to prevent orbit determination error accumulation caused by data packet loss), and medium signal-to-noise ratio weights.

[0042] Real-time data transmission tasks, including tasks such as second-level transmission of disaster monitoring data and battlefield situation awareness and sharing tasks. Such tasks have strict requirements for link latency and require reliability, with the highest latency weights, high bit error rate weights, and low jitter weights (non-continuous flow services are not sensitive to jitter).

[0043] Large-capacity relay tasks, including tasks such as processing massive remote sensing data and high-definition image and video stream transmission tasks. Such tasks require high bandwidth and anti-interference capabilities, with the highest signal-to-noise ratio weights, high load weights (dynamic traffic scheduling is required to avoid link congestion), and low latency weights (allowing moderate queuing delays in exchange for maximizing throughput).

[0044] Network management tasks, including tasks such as inter-satellite topology dynamic planning, link resource scheduling, and fault recovery tasks. Such tasks focus on load balancing and link stability, with the highest load weights, high bit error rate weights (management signaling errors will cause routing failures), and medium latency weights.

[0045] The collaborative networking task is a task jointly executed by multi-orbit satellites, such as the GEO-LEO collaborative observation task. Such tasks require high synchronization accuracy and low jitter, and have medium signal-to-noise ratio weight (the cross-orbit link needs to compensate for free space loss) and low load weight (the amount of coordination signaling data is small).

[0046] A specific weight allocation example of the channel state parameters based on the above service types is shown in Table 1.

[0047] Table 1. Channel State Parameter Weight Table Through the above dynamic weight allocation, according to the obtained channel state parameters for different service scenarios, the comprehensive score of the current channel state can be finally obtained.

[0048] More specifically, for S400, to determine whether it is necessary to regulate the current channel, it is necessary to make a comprehensive judgment based on the comprehensive score of the current channel state and the current channel state parameters, combined with the service type.

[0049] After calculating the weighted average of each current channel state parameter according to the channel state parameter weight table, the comprehensive score of the current channel state is obtained, and then the inter-satellite link channel score level is obtained according to the comprehensive score. Taking a grade standard as an example.

[0050] The score range is 90 - 100, and it is judged as excellent.

[0051] The score range is 80 - 89, and it is judged as good.

[0052] The score range is 60 - 79, and it is judged as qualified.

[0053] The score range is lower than 60, and it is judged as unqualified.

[0054] For different service types, the required channel score levels are different. For precision measurement tasks and real-time data transmission tasks, the required channel score level is at least excellent; for large-capacity relay tasks and collaborative networking tasks, the required channel score level is at least good; for network management tasks, the required channel score level is at least qualified. For the target service type, if the score level of the comprehensive score of the current channel state does not meet the requirements, the comprehensive score of the channel state is vetoed, and it is necessary to regulate the channel. If the score level of the comprehensive score of the current channel state is unqualified, it means that the current channel state is not suitable for continued use, and it is necessary to switch to the redundant link.

[0055] In addition to judging the comprehensive score of the current channel state, it is also necessary to judge the channel state parameters. Since for different service types, their emphases on channel state parameters vary, some channel state parameters need to meet the minimum conditions required by specific service types. This is a hard standard. If not met, the channel state will be hard-rejected, and the channel must be regulated.

[0056] For example, for precision measurement tasks, the signal-to-noise ratio and bit error rate must meet the threshold requirements; for real-time data transmission tasks, the latency and bit error rate must meet the threshold requirements; for high-capacity relay tasks, the load rate and signal-to-noise ratio must meet the threshold requirements; for network management, the load weight must meet the threshold requirements; for cooperative networking tasks, the latency and jitter must meet the threshold requirements. If the current channel state is hard-rejected, targeted channel regulation is performed on the channel state parameters corresponding to the hard-rejection; if channel regulation is required through the judgment of the scoring level of the comprehensive score of the current channel state, it is necessary to sort the regulation priority levels of each channel state parameter, and regulate the channel state parameters with higher rankings. The specific method is to calculate the priority score of the channel state parameter in the comprehensive score for the target service type, that is: S i =ω i ×(1 - d i / 100) where S i is the priority score of channel state parameter i, ω i is the weight of channel state parameter i in the target service type, and d i is the initial score of channel state parameter i. Then, by sorting S i , the priority level of the channel state parameters to be regulated is obtained. Calculate the deviation degree of channel state parameter i through (1 - d i / 100), and then couple and screen the deviation degree with the weight ω i to specifically handle the main contradictions affecting the channel state, which helps to improve the utilization efficiency of regulation resources and achieve fast and efficient regulation of the channel state.

[0057] For example, for a precision measurement task, the score of the measured signal-to-noise ratio is 70 points, the calculated deviation degree of the signal-to-noise ratio is 0.3, and the weight of the signal-to-noise ratio in the precision measurement task is 0.2. Then the calculated priority score of the signal-to-noise ratio is 0.06. If the measured bit error rate score is 80 points at the same time, the calculated deviation degree of the bit error rate is 0.2, and the weight of the bit error rate in the precision measurement task is 0.25. Then the calculated priority score of the bit error rate is 0.05, which is lower than the priority score of the signal-to-noise ratio. Therefore, in this embodiment, the regulation of the signal-to-noise ratio has a higher priority than the regulation of the bit error rate.

[0058] Furthermore, in another embodiment, different channel state parameters have different regulation methods and regulation strategies.

[0059] For the signal-to-noise ratio (SNR), the power of the signal transmitting terminal (such as the laser power) is preferentially increased to enhance the signal strength at the receiving end. If the power adjustment is insufficient to change the SNR, the modulation mode is switched to a lower order (such as from QPSK to BPSK) to sacrifice the rate for an improvement in the noise resistance.

[0060] For the bit error rate (BER), the error correction strength is selected according to the BER threshold, and a flexible switch is implemented between LDPC codes and Turbo codes.

[0061] For the link load rate, the bandwidth is dynamically allocated according to the link load rate threshold. When the link load rate approaches the upper limit, a backup link (such as a GEO relay) is enabled or multipath transmission (such as MPTCP) is adopted to avoid congestion on a single link.

[0062] For the latency, through fast rerouting (FRR), the backup link is switched to when the latency of the main path is too large. For the jitter, the clock drift is reduced through direct clock synchronization.

[0063] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not imply the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0064] As mentioned above, the channel state parameters and service types involved in the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0065] In another embodiment, please refer to Figure 3, an inter-satellite link communication system for constellation networking of the present application includes a transmitting module 1, a monitoring module 2, and a receiving module 3. The transmitting module 1 of the master satellite sends a test signal to the receiving module 3 of the slave satellite to form a channel, and monitors and evaluates the current channel state through the monitoring module 2. According to the evaluation situation, the transmitting module 1 is regulated, and the regulation parameters are sent to the receiving module 3 of the slave satellite. The slave satellite adaptively regulates the receiving module 3 according to the regulation parameters. For any master satellite, its transmitting module may be connected to more than one slave satellite, forming a plurality of channels, and the monitoring module 2 monitors each channel separately. For any satellite, it may be a master satellite that sends signals through the transmitting module 1 at the same time, or it may be a slave satellite that receives signals through the receiving module 3 at the same time; when the receiving module 3 of the present satellite receives signals, the monitoring of the channel is carried out by the monitoring module 3 of the corresponding master satellite on the inter-satellite link, and the monitoring module 3 of this satellite does not participate in the monitoring.

[0066] Further, in another embodiment, the transmitting module is a laser signal transmitting module, and the receiving module is a laser signal receiving module. Laser communication realizes information transmission by modulating an electrical signal onto an optical wave, and has the advantages of high transmission rate and high bandwidth. Inter-satellite laser communication has currently achieved preliminary large-scale applications.

[0067] Those skilled in the art can understand that Figure 3 the structure shown in

[0068] is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements. For the convenience and simplicity of description, only the above-mentioned division of each functional unit and module is used as an example. In practical applications, the above-mentioned functions may be assigned to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0068] In another embodiment, the present application provides a computer device, and its internal structure diagram may be as Figure 4As shown in the figure. The computer device includes a processor, a memory, and a signal interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. When the computer program is executed by the processor, it implements the steps of an inter-satellite link communication method for constellation networking. The signal interface of the computer device is used to send and receive modulated signals externally to achieve communication connection with external devices. Specifically, in this embodiment, the signal interface sends and receives modulated laser signals.

[0069] In another embodiment, the present application provides a computer program product, which includes computer programs or instructions that enable the computer programs or instructions to implement the steps in the above-mentioned inter-satellite link communication method for constellation networking.

[0070] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described inter-satellite link communication method for constellation networking can refer to the corresponding process in the foregoing method embodiments and will not be elaborated herein.

[0071] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state drive), etc.

[0072] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by relevant hardware instructed by a computer program. This program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The foregoing storage media include various media that can store program codes such as ROM or random access memory (RAM), magnetic disks, or optical discs.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for inter-satellite link communication in constellation networking, which is used to achieve communication connection between two on-orbit satellites in constellation networking, and is characterized in that, It includes the following steps: For any inter-satellite link connecting two on-orbit satellites, one on-orbit satellite is set as the master satellite and the other on-orbit satellite is set as the slave satellite; when establishing the inter-satellite link, the master satellite sends a test signal to the slave satellite to establish a channel, collects and evaluates the current channel state, regulates the channel according to the evaluation result, and sends the channel regulation parameters to the slave satellite. The slave satellite regulates the channel to be adapted to the master satellite according to the channel regulation parameters.

2. The inter-satellite link communication method for constellation networking according to claim 1, wherein the constellation The network formation is divided into a master control satellite and ordinary satellites. For any inter-satellite link connecting the master control satellite and an ordinary satellite, the master control satellite is the master satellite and the ordinary satellite is the slave satellite; for any inter-satellite link connecting two ordinary satellites, the ordinary satellite closer to the nearest master control satellite in terms of relative distance is the master satellite, and the other ordinary satellite is the slave satellite.

3. The method for inter-satellite link communication in constellation networking according to claim 1, wherein The specific steps for the master satellite to collect and evaluate the current channel state include: S100, collect the current channel state parameters; S200, perform normalization processing on the channel state parameters, establish a scoring model, and score the channel state parameters; S300, classify the service types of the signal transmission on the inter-satellite link, allocate weights to the channel state parameters according to the service types, and calculate the comprehensive score of the current channel state through weighted calculation; S400, determine whether the channel needs to be regulated based on the channel state parameter score, the comprehensive channel state score, and the service type, and then determine the channel regulation parameters.

4. The method for inter-satellite link communication in constellation networking according to claim 3, characterized in that, In S100, the channel state parameters include signal-to-noise ratio, bit error rate, link load rate, delay, and jitter; Among them, the signal-to-noise ratio is obtained by measuring the received signal power and the noise power, and there is: Where SNR(dB) is the signal-to-noise ratio, p signal is the measured received signal power, and P noi is the noise power; The bit error rate is calculated by counting the number of error codes through the encoding and decoding process of the error correction code, and there is: In the formula, BER is the bit error rate; The link load rate is calculated by statistically calculating the ratio of the data volume transmitted per unit time to the maximum channel capacity, and there is: The delay is calculated by sending a timestamp signal through the inter-satellite link to calculate the propagation delay, and there is: In the formula, RTT is the signal round-trip propagation time; The jitter is measured based on calibrating the clock deviation by a cesium atomic clock or measuring the light speed delay, and there is: where N is the total number of measured data packets, t k is the arrival time of the kth data packet, and ΔT ideal is the ideal transmission interval time.

5. The method for inter-satellite link communication in constellation networking according to claim 4, characterized in that The specific method for S200 to score the channel state parameters is: Map each channel state parameter to the 0-100 score range; Signal-to-noise ratio score: SNR(dB)≧20dB gets full marks, and 15 points are deducted for every 5dB reduction; Bit error rate score: BER≤10-8 gets full marks, and 20 points are deducted for each order of magnitude increase; Link load rate score: Link load rate≤70% gets full marks, and 25 points are deducted for every 5% excess; Delay and jitter score: Delay≤40ms and jitter≤5ms get full marks, and 10 points are deducted for each detection exceeding the threshold.

6. The inter-satellite link communication method for constellation networking according to claim 3, characterized in that, In S300, the specific service types of the inter-satellite link are divided into precise measurement tasks, real-time data transmission tasks, large-capacity relay tasks, network management tasks, and cooperative network formation tasks.

7. An inter-satellite link communication system for constellation networking, characterized in that, It includes a sending module, a monitoring module and a receiving module; the sending module of the main satellite sends a test signal to the receiving module of the slave satellite to form a channel, and monitors and evaluates the current channel state through the monitoring module, regulates the sending module according to the evaluation situation, sends the regulation parameters to the receiving module of the slave satellite, and the slave satellite adaptively regulates the receiving module according to the regulation parameters.

8. The inter-satellite link communication system for constellation networking according to claim 7, characterized in that, The sending module is a laser signal sending module, and the receiving module is a laser signal receiving module.

9. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the inter-satellite link communication method for constellation networking described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program or instruction, enabling the computer program or instruction to implement the steps in the inter-satellite link communication method for constellation networking described in any one of claims 1 to 6.

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