A method for resolving multi-beam spatial frequency collisions

Abstract

The application discloses a kind of multi-beam space frequency conflict resolution methods, applicable to large-scale low-orbit satellite constellation system.The method takes high-orbit satellite as centralized control node, receives the orbit state and service demand of each low-orbit satellite in system, analyzes its allowed transmission practice window and required continuous transmission time slot;On this basis, the spatial intersection area between low-orbit and potential interference period is calculated;For differentiated transmission needs, according to preset orbit priority order, transmission time slot resources are sequentially allocated to each low-orbit satellite transmission service.The application realizes the effective avoidance of different orbit satellites in intersection area transmission service potential same-frequency interference in complex space-time dynamic environment through global perception of high-orbit satellite to low-orbit satellite orbit state and service demand, search and judgment of orbit intersection interference beam and period, and comprehensive decision of service transmission timing optimization allocation, significantly improves the transmission success rate and overall resource utilization of large-scale low-orbit constellation system.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication, and specifically relates to a method for resolving spatial frequency conflicts in multi-beam systems. Background Technology

[0002] With the rapid development of low Earth orbit (LEO) satellites, the number of satellites has surged, and orbital density has significantly increased. Against this backdrop, satellite systems need to efficiently and reliably transmit large amounts of service data. However, spatial overlap areas inevitably exist between different LEO satellite orbits, and service transmission is usually constrained by strict time windows, requiring it to begin after a specified start time and complete before a specified end time, while also meeting the requirement of uninterrupted transmission with continuous channel occupancy. When two or more satellites are simultaneously in the overlap area and transmitting services concurrently, if their frequency bands are the same or similar, severe co-channel interference will occur, leading to degraded communication quality or even service interruption, severely limiting the overall capacity and reliability of the constellation system.

[0003] In dense low-Earth orbit (LEO) constellations, the spatial and temporal regions where orbits intersect and concurrent transmission on the same frequency are significant factors inducing inter-beam interference and threatening communication reliability. When two LEO satellites in different orbits reach the spatial intersection region, their onboard network controllers, based on preset or received transmission plans, direct their communication beams towards the target. When both satellites are actively transmitting in this spatial intersection region, and both use the same frequency band for service transmission, their beam signals will interfere with each other in this overlapping spatial domain. This inter-beam interference caused by simultaneous transmission on the same frequency severely degrades the quality of received signals, causing signal decoding errors or link interruptions, ultimately leading to service failure or a significant performance degradation. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-beam spatial frequency conflict resolution method to solve the problem in the prior art where the beam signals interfere with each other in the overlapping airspace due to the intersection of low-Earth orbit satellite orbits, resulting in transmission service failure or significant performance degradation.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for resolving spatial frequency conflicts in a multi-beam array includes the following steps: Step 1: The high-orbit satellite receives service requests from all low-orbit satellites and determines the transmission requirement parameters for all service requests from each low-orbit satellite. The high-orbit satellite determines the service priority of each low-orbit satellite, the orbit of each low-orbit satellite, and the real-time position of each low-orbit satellite in its own orbit. Step 2: Randomly select two low-Earth orbit satellites and determine whether their orbits intersect in space. If there is no interference or the satellite beams of the two low-orbit satellites are not at the same frequency, it is marked as no interference; If two low-Earth orbit satellites exist and their satellite beams are on the same frequency, then the potential interference period between these two low-Earth orbit satellites is determined. Iterate through all pairs of low-Earth orbit satellites to obtain all potential interference periods as a potential interference set; Step 3: Determine the interference constraints and allocate time slot resources to the highest priority low-Earth orbit satellites; lock the current time slot allocation results for the low-Earth orbit satellites and update the system time slot occupancy and current resource status; Step 4: Allocate time slot resources to the next priority low-Earth orbit satellites according to the interference constraints; lock the time slot allocation results of the current low-Earth orbit satellite orbits, and update the system time slot occupancy and current resource status; Step 5: Repeat steps 3-4 until all low-orbit satellites have been traversed. Then, the high-orbit satellites determine the final scheduling scheme and generate scheduling instructions, proceeding to step 6. Step 6: The high-orbit satellite transmits the scheduling instructions to the corresponding low-orbit satellite, completing the scheduling of all low-orbit satellites.

[0006] The present invention also has the following features: Furthermore, the transmission requirement parameters in step 1 include the allowed transmission time window and the required number of consecutive transmission time slots.

[0007] Furthermore, in step 2, the set of orbits for each low-Earth orbit satellite is denoted as... , Indicates the total number of orbits; Within a scheduling cycle of a high-orbit satellite, the orbital cycle of each low-orbit satellite is divided into time slots, with the smallest unit of time-domain resource allocation as the time slot. The time slots are divided into M time slots, each with a length of t. The starting times of the time slots are as follows: ; If there is spatial overlap and the satellite beams of the two low-Earth orbit satellites have the same frequency, then for any two orbits Record the potential time period as ,in .

[0008] Furthermore, in step 3, the interference constraints include the following four items: Interference Constraint 1: Any service request from any low-Earth orbit satellite k From the start point of time slot one Start transmission and occupy continuously. A complete time slot; among which ,and

[0009] Interference Constraint 2: For any two low-Earth orbit (LEO) satellites, if the satellite beams of the two LEO satellites are of the same frequency; and the corresponding orbits of the two LEO satellites are... If there is a spatial intersection, then during the intersection, the two orbits... There cannot be service transmissions simultaneously; Interference constraint 3: Within one scheduling cycle of a high-orbit satellite, any time slot can only be allocated to one service; Interference constraint 4: The scheduling process of high-orbit satellites follows the service priority order of low-orbit satellites.

[0010] Compared with the prior art, the present invention has the following technical effects: In the multi-beam spatial frequency conflict resolution method of this invention, the onboard processor of the high-orbit satellite first parses the received service requests from each low-orbit satellite, clarifies their service characteristics and requirements, and then accurately calculates the number of consecutive time slots required to complete the actual transmission of the service. This required number of time slots is determined by factors such as the amount of service data and the transmission rate, and does not exceed the maximum number of time slots that the service's allowed transmission time window can accommodate. Based on this global monitoring data, the high-orbit satellite, through its onboard processor, calculates the spatial intersection area and the corresponding intersection time window (defined as a potential interference period) between any two low-orbit orbits. Simultaneously, the high-orbit satellite grasps the allowed transmission time window and the calculated number of consecutive transmission time slots required for each low-orbit satellite's pending transmission service, and executes centralized resource scheduling decisions. This effectively avoids mutual interference of beam signals in overlapping spatial domains. Through global perception and centralized scheduling by the high-orbit satellite, combined with a multi-beam service transmission timing optimization strategy based on interference period judgment, efficient utilization of satellite communication resources and enhanced communication reliability are achieved, providing key technical support for the safe and stable operation of high-density low-orbit constellations. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of multi-beam space coverage for satellites in different orbits according to the present invention; Figure 2 This is a schematic diagram of track crossing interference according to the present invention; Figure 3 This is a schematic diagram of the operation process of the present invention. Detailed Implementation

[0012] It should be noted that, unless otherwise specified, all components in this invention are components known in the prior art.

[0013] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0014] In this embodiment, a high-orbit satellite is used as a centralized control node. Relying on its advantages of wide coverage and long dwell time, the high-orbit satellite can continuously monitor the orbital status, position information, and service parameters to be transmitted of all low-orbit satellites within its coverage area.

[0015] Based on this global monitoring data, high-orbit satellites can accurately calculate the spatial intersection area between any two low-orbit orbits and the corresponding intersection time window (defined as the potential interference period).

[0016] High-orbit satellites can grasp the allowed transmission time window and required continuous transmission duration information for each low-orbit satellite's pending transmission services, and execute centralized resource scheduling decisions to achieve overall planning and optimized allocation.

[0017] Specifically, the core scheduling task of high-orbit satellites is to comprehensively coordinate and optimize the allocation of all low-orbit satellites' pending transmission service requirements and the required beam resources.

[0018] Its core lies in generating a clear resource allocation order table. This scheduling process allocates the transmission start time of each low-Earth orbit satellite according to a preset orbital priority rule.

[0019] During the allocation process, for any given low-Earth orbit satellite, its beam resources can only be allocated to one service for transmission within the same time period, ensuring that service transmissions on the same orbit do not overlap in time. Furthermore, when the orbits of any two low-Earth orbit satellites with the same communication frequency bands intersect in space and time, scheduling must be used to ensure that the service transmissions of these two satellites under the corresponding beams are completely staggered within the corresponding cross-interference time periods, i.e., there can be no overlap.

[0020] By coordinating space and time, inter-beam interference caused by simultaneous transmission at the same frequency in spatial intersection areas can be avoided, thus resolving spatial frequency conflicts of multiple beams.

[0021] Furthermore, such as Figure 3 As shown, a multi-beam spatial frequency conflict resolution method includes the following steps: Schematic diagrams of multi-beam space coverage and orbital cross-interference of satellites in different orbits are shown below. Figure 1 and 2 As shown; Step 1: The high-orbit satellite receives service requests from all low-orbit satellites and determines the transmission requirement parameters for all service requests from each low-orbit satellite. The priority, orbit, and real-time position of each LEO satellite are determined. Based on the real-time satellite orbit data, the position and operational status of each satellite are updated to provide a basis for subsequent interference period calculations.

[0022] Step 2: Randomly select two low-Earth orbit satellites and determine whether their orbits intersect in space. If it does not exist, mark it as non-interference; If interference exists but the satellite beams of the two low-orbit satellites are not at the same frequency, then it is marked as no interference; If two low-Earth orbit satellites have the same satellite beam frequency, then the potential interference period between these two low-Earth orbit satellites is determined. Iterate through all pairs of low-Earth orbit satellites and collect all potential interference periods as a potential interference set. Step 3: Determine the interference constraints and allocate time slot resources to the highest priority low-Earth orbit satellites; lock the current time slot allocation results for the low-Earth orbit satellites and update the system time slot occupancy and current resource status; Step 4: Allocate time slot resources to the next priority low-Earth orbit satellites according to the interference constraints; lock the time slot allocation results of the current low-Earth orbit satellite orbits, and update the system time slot occupancy and current resource status; Step 5: Repeat steps 3-4 until all low-Earth orbit satellites have been traversed, then proceed to step 6. Step 6: The high-orbit satellite transmits the final scheduling instructions to the corresponding low-orbit satellite, completing the scheduling of all low-orbit satellites.

[0023] Furthermore, the transmission requirement parameters in step 1 include the allowed transmission time window and the required number of consecutive transmission time slots.

[0024] Furthermore, in step 2, for the beam space frequency conflict problem of a multi-star system containing N orbits, an orbit set is defined. . Indicates the total number of orbits; The time-domain resources of LEO satellites are divided into time slots, and the smallest unit for allocating system time-domain resources within a scheduling cycle is a time slot.

[0025] The operating cycle of low-orbit orbit The time slot is divided into M time slots, each with a length of t, and the starting time of each time slot is... .

[0026] Within a scheduling cycle of a high-orbit satellite, the orbital cycle of each low-orbit satellite is divided into time slots, with the smallest unit of time-domain resource allocation as the time slot. The time slot is divided into M time slots, each with a length of t, and the starting time of each time slot is... ; If two low-Earth orbit satellites have the same satellite beam frequency, then for any two orbits Record the potential time period as ,in .

[0027] Specifically, within a scheduling cycle for a high-orbit satellite, the satellites in orbit i... Define the service set to be transmitted. , for the k Business Define the parameters: Define the allowed transmission time window for this service as That is, business must Transmission began afterward and in Previous transmission complete.

[0028] The regulations stipulate that service transmission requires the establishment of a link connection, meaning continuous transmission over a complete period of time is necessary, and its characteristic is that once started, it cannot be interrupted. The number of time slots that service k needs to continuously occupy is defined as... ,and .

[0029] The onboard processor, considering transmission service requirements and constraints related to co-frequency interference between multiple satellite beams, determines the actual resource allocation order table. This indicates the access status of service k.

[0030] in, =1 indicates that access is allowed within the current period. =0 indicates that the service was rejected due to a conflict with other tracks or because the time allocation conditions could not be met. This represents the start time of transmission for service k, where .

[0031] Furthermore, in step 3, the interference constraints include the following four items: Interference Constraint 1: Service k From the start point of time slot one Start transmission and occupy continuously. A complete time slot; among which ,and ; Interference constraint 2: For any two different orbits If the satellite beams of the low-orbit satellites corresponding to the two orbits are at the same frequency, and the two orbits intersect in time and space, then during the period when the two orbits intersect, there cannot be simultaneous service transmission on the orbits. This constraint ensures that in critical spatiotemporal regions where orbits intersect and operate on the same frequency, interference caused by simultaneous transmission on the same frequency will not occur.

[0032] Interference constraint 3: Within one scheduling cycle of a high-orbit satellite, any time slot can only be allocated to one service; Interference Constraint 4: The scheduling process follows a preset priority order for low-Earth orbit satellites (e.g., sequential scheduling from orbit number 1 to N). Service scheduling for orbit j can only proceed after scheduling decisions for all orbits with numbers less than j (i.e., orbits 1, 2, ..., j-1) have been completed. That is, for j > i, the decision variable (acceptance state) for service k on orbit j... and start time It must be ensured that there is no conflict with all accepted services on the scheduled track number i, i.e., constraint 2 is not violated.

Claims

1. A method for resolving spatial frequency conflicts in a multi-beam array, characterized in that, Includes the following steps: Step 1: The high-orbit satellite receives service requests from all low-orbit satellites and determines the transmission requirement parameters for all service requests from each low-orbit satellite. The high-orbit satellite determines the service priority of each low-orbit satellite, the orbit of each low-orbit satellite, and the real-time position of each low-orbit satellite in its own orbit. Step 2: Randomly select two low-Earth orbit satellites and determine whether their orbits intersect in space. If there is no interference or the satellite beams of the two low-orbit satellites are not at the same frequency, it is marked as no interference; If two low-Earth orbit satellites exist and their satellite beams are on the same frequency, then the potential interference period between these two low-Earth orbit satellites is determined. Iterate through all pairs of low-Earth orbit satellites to obtain all potential interference periods as a potential interference set; Step 3: Determine the interference constraints and allocate time slot resources to the highest priority low-Earth orbit satellites; lock the current time slot allocation results for the low-Earth orbit satellites and update the system time slot occupancy and current resource status; Step 4: Allocate time slot resources to the next priority low-Earth orbit satellites according to the interference constraints; lock the time slot allocation results of the current low-Earth orbit satellite orbits, and update the system time slot occupancy and current resource status; Step 5: Repeat steps 3-4 until all low-orbit satellites have been traversed. Then, the high-orbit satellites determine the final scheduling scheme and generate scheduling instructions, proceeding to step 6. Step 6: The high-orbit satellite transmits the scheduling instructions to the corresponding low-orbit satellite, completing the scheduling of all low-orbit satellites; In step 2, the set of orbits for each low-Earth orbit satellite is denoted as... , Indicates the total number of orbits; Within a scheduling cycle of a high-orbit satellite, the orbital cycle of each low-orbit satellite is divided into time slots, with the smallest unit of time-domain resource allocation as the time slot. The time slots are divided into M time slots, each with a length of t. The starting times of the time slots are as follows: ; If there is spatial overlap and the satellite beams of the two low-Earth orbit satellites have the same frequency, then for any two orbits Record the potential time period as ,in ; In step 3, the interference constraints include the following four items: Interference Constraint 1: Any service request from any low-Earth orbit satellite k From the start point of time slot one Start transmission and occupy continuously. A complete time slot; among which ,and ; Interference Constraint 2: For any two low-Earth orbit (LEO) satellites, if the satellite beams of the two LEO satellites are of the same frequency; and the corresponding orbits of the two LEO satellites are... If there is a spatial intersection, then during the intersection, the two orbits... There cannot be service transmissions simultaneously. , ; Interference constraint 3: Within one scheduling cycle of a high-orbit satellite, any time slot can only be allocated to one service; Interference constraint 4: The scheduling process of high-orbit satellites follows the service priority order of low-orbit satellites.

2. The multi-beam spatial frequency conflict resolution method as described in claim 1, characterized in that, The transmission requirement parameters in step 1 include the allowed transmission time window and the required number of consecutive transmission time slots.

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