A method for determining a low-orbit satellite blocking signal by a satellite ground station

Abstract

The application discloses a kind of satellite ground station to low-orbit satellite shelter signal determination method, it is related to satellite communication technical field, including, based on no shelter reference trajectory record, the measured value of each time is compared with the same time no shelter reference value item by item, obtain the total downward trajectory record in candidate section inside, eliminate the influence of slow change, remaining downward of suddenness is retained and the key point of recess is identified, generate residual recess chain record;To link crossing candidate chain and residual recess chain record carry out center residence homocentric inscription, front edge press into occlusion inscription and rear edge detachment release inscription, form homocentric occupancy lock record;Around homocentric occupancy lock record look back link verification information, carry out non-shelter source elimination, generate low-orbit satellite shelter confirmation record, and write into non-shelter downward record that the record that has not maintained continuous closure.This application improves downward identification pertinence and low-orbit satellite shelter signal determination accuracy.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, and in particular to a method for a satellite ground station to determine signal obstruction by a low-orbit satellite. Background Technology

[0002] As satellite communications continue to evolve towards broadband, space-ground convergence, and multi-orbit collaboration, establishing stable service links between satellite ground stations and high-orbit satellites remains a crucial application in fixed satellite communications. Simultaneously, the scale of low-orbit satellite networks continues to expand, and the rapid crossings of low-orbit satellites near the field of view of satellite ground stations are becoming increasingly frequent. The methods for analyzing satellite communication link status have evolved from an early focus on monitoring single reception parameters to a comprehensive approach that combines orbital position, antenna pointing, service frequency band, reception status, and timing relationships. This allows for better understanding and addressing the link monitoring and status identification needs in complex space-ground communication environments.

[0003] Existing satellite communication link interpretation technologies still have two shortcomings in scenarios where low-Earth orbit satellites cross the line-of-sight direction of high-Earth orbit services: Firstly, the interpretations are mostly based on changes in received signal strength, carrier-to-noise ratio, or bit error rate, and do not adequately utilize the combined use of the low-Earth orbit satellite's spatial crossing position, the line-of-sight direction of services, and the relationship of continuous time slice progression, making it difficult to accurately distinguish between the source of obstruction and ordinary link fluctuations; secondly, the existing interpretation process lacks collaborative verification and layered rejection of non-obstruction downgrades caused by received link alarms, antenna servo offsets, rainfall fading, and atmospheric fluctuations, which can easily interfere with the obstruction confirmation results. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a method for satellite ground stations to determine low-orbit satellite obstruction signals, solving the problem of obstruction confirmation when low-orbit satellites cross the line of sight of high-orbit services and assisting in solving the problem of non-obstruction downslope rejection.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a method for a satellite ground station to determine signal obstruction from low-Earth orbit satellites, comprising: Link construction information from the satellite ground station is collected, and a line-of-sight convergence corridor is established around the operational line-of-sight direction from the satellite ground station to the high-orbit satellite. This corridor is then progressively expanded to form a candidate link traversal chain. Candidate segments within this chain are acquired, and front and rear steady-state segments are extracted from both sides of each segment to generate a dual-sided traction end record. Simultaneously, the continuous reception trajectory under unobstructed conditions is written along the candidate segments towards the candidate center, forming an unobstructed reference trajectory record. Based on this unobstructed reference trajectory record, the measured values ​​at each moment are compared with the unobstructed values ​​at the same moment. The reference values ​​are compared item by item to obtain the total drop trajectory record within the candidate segment. The influence of gradual changes is eliminated, the sudden residual drop is retained, and the key points of the depression are identified to generate the residual depression chain record. The link crossing candidate chain and residual depression chain record are subjected to center residence concentric writing, leading edge pressing and biting writing, and trailing edge detachment and release writing to form a concentric occupancy locking record. The link verification information is checked back around the concentric occupancy locking record to remove non-obstruction sources and generate a low-orbit satellite obstruction confirmation record. Records that do not maintain continuous closure are written as non-obstruction drop records.

[0007] As a preferred embodiment of the method for determining low-orbit satellite signal obstruction by the satellite ground station described in this invention, the establishment of the line-of-sight convergence corridor is specifically as follows: The link construction information of the satellite ground station is collected at the same time and written sequentially to obtain the link construction information record; Based on the link construction information record, the business direction is extracted and spatially aligned is inserted, and the low-orbit satellite orbit data content is simultaneously added to obtain the business line-of-sight direction record; The link field of view and center line of view position are recorded by delineating the azimuth, elevation and antenna main lobe convergence range in the business line of view direction record, thus forming a line of view convergence corridor record.

[0008] As a preferred embodiment of the method for determining low-orbit satellite signal obstruction by the satellite ground station described in this invention, the step of forming a link traversing candidate chain is specifically as follows: Based on the line-of-sight convergence corridor record, the co-position landing point of the low-orbit satellite continuous time slice is written and the propulsion trajectory is connected to obtain the point-by-point push-out record; The entry time, center time, and departure time are extracted from the point-by-point push record, and candidate segments are written in sequence to generate a link traversal candidate chain.

[0009] As a preferred embodiment of the method for determining low-orbit satellite signal obstruction by the satellite ground station described in this invention, the generation of dual-sided traction end records is specifically as follows: Candidate segments are extracted from the continuous time content in the candidate chain of link crossing, and steady-state time lookup and reception state continuity screening are performed around both sides of the candidate segments to generate bilateral steady-state segment records. Based on the records of the two-sided steady-state sections, traction end locking and candidate center acceptance are performed on the front and rear steady-state sections to form the two-sided traction end records.

[0010] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by the satellite ground station described in this invention, the step of forming an unobstructed reference trajectory record is specifically as follows: Around the dual-sided traction end records, perform counter-clockwise backfilling along the candidate section toward the candidate center position to form a bidirectional supplementary trajectory record; Based on the bidirectional rewriting trajectory record, the same-position receiving bundle is executed at the candidate center position to form an unobstructed continuous receiving trajectory record. Based on the unobstructed continuous reception trajectory record, the unobstructed reception content of each time step in the candidate segment, together with the content received on both sides, is sequentially written to form an unobstructed reference trajectory record.

[0011] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by a satellite ground station according to the present invention, the method for obtaining the total downtrend trajectory record within the candidate segment is as follows: Based on the unblocked reference trajectory record, reference trajectory information is obtained at each moment along the candidate section and the measured value at the same moment is retrieved. The unblocked reference value and the measured value at the same moment are written by double track pressing and candidate center traction convergence to form the same moment alignment record. Based on the synchronous alignment record, the pressure difference chain of the reference value without a stop and the measured value at the same time along the candidate section is written out and connected in series to form the total downward trajectory record.

[0012] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by a satellite ground station according to the present invention, the generation of residual concave chain records is specifically as follows: The downward segment in the total downward trajectory record is gradually stripped of its trailing edge, removing the slowly extending downward content to form a sudden remaining downward record; Based on the record of sudden remaining decline, the key points of the depression are locked out from front to back along the candidate section to form a record of key points of depression. Based on the key point records of the depression, the sudden remaining decline record is divided into a continuous decline segment, a trough dwell segment, and a continuous rebound segment, and then written into a residual depression chain record in chronological order.

[0013] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by the satellite ground station described in this invention, the formation of the concentric occupancy locking record is specifically as follows: Obtain the corresponding position content in the link crossing candidate chain and residual depression chain record, perform concentric writing with the candidate center position as the writing base point, and extend the connection relationship to both sides to form a concentric writing base record; Based on the concentric writing benchmark record, around the candidate center position and the position content with the lowest degree of decline and continuous residence in the trough residence segment, perform same-position pressing and two-sided opposite convergence to obtain the concentric locking point and form the center residence concentric writing record. The first half of the continuous approach content and continuous downward content of the central residence concentric inscription record are indented and interlocked, and the front boundary lock point is written to obtain the front edge indented and interlocked inscription record. Based on the indentation and interlocking record of the leading edge, the release and disengagement record of the continuous departure and continuous rise content of the second half is written, the rear boundary lock point is written, and the rear edge release and disengagement record is obtained. Based on the trailing edge release writing record, the trailing boundary lock point is obtained, and combined with the concentric lock point and the front boundary lock point, a sequential sealing and occupancy closure are performed to obtain the concentric occupancy lock record.

[0014] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by the satellite ground station described in this invention, the step of eliminating non-obstruction sources specifically includes the following: The link verification information at the corresponding time is retrieved from the front boundary lock point, the concentric lock point and the back boundary lock point in the concentric occupancy lock record, and written in sequence with the occupancy closed chain content to form a link verification back lookup record; Verify and review records along the link, identify alarm content of forward-moving through-type receiving link, separate the corresponding independent downlink content, and form alarm removal records; Based on the alarm removal record, the antenna servo offset stored content is retrieved, and the corresponding content of the previous through-type servo offset is further separated to form a servo removal record.

[0015] As a preferred embodiment of the method for determining low-orbit satellite obstruction signals by the satellite ground station described in this invention, the step of writing records that do not maintain continuous closure as non-obstruction downslope records is as follows: Based on the servo-removed records, the rainfall and atmospheric fluctuation records are checked, and the records of continuous slow descent and slow decline caused by fluctuations are further separated to form a closed verification record. Regarding whether the closure verification record maintains continuous closure between the pre-boundary locking point, concentric locking point, and post-boundary locking point, the content that meets the continuous closure condition is written as the low-orbit satellite occlusion confirmation record, and the content that does not meet the continuous closure condition is written as the non-occlusion drop record.

[0016] The beneficial effects of this invention are as follows: by supplementing and connecting the double-sided traction end, unobstructed reference trajectory reconstruction is achieved, which is used for satellite communication link reference restoration and improves the targeting of descent identification. By locking the concentric occupancy and eliminating non-obstruction sources, obstruction closure verification is achieved, which is used to distinguish between low-orbit obstruction and alarm, servo, and rain attenuation disturbances, thereby improving the accuracy of low-orbit satellite obstruction signal judgment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the method used by satellite ground stations to determine signal obstruction from low-Earth orbit satellites.

[0019] Figure 2 A flowchart for generating candidate chains for link traversal.

[0020] Figure 3 A flowchart for generating unblocked reference trajectory records and residual concave chain records.

[0021] Figure 4 A flowchart for recording concentric occupancy lock and confirming low-orbit satellite obstruction. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Reference Figures 1-4 This is one embodiment of the present invention, which provides a method for a satellite ground station to determine signal obstruction by a low-orbit satellite, comprising the following steps: S1: Collect link construction information of satellite ground stations, establish a line-of-sight convergence corridor around the operational line of sight from satellite ground stations to high-orbit satellites, and sort out the links point by point to form candidate links for traversal; S1.1: The link construction information of the satellite ground station is collected at the same time and written sequentially to obtain the link construction information record; Furthermore, for the link construction information of the satellite ground station, time alignment is performed on the location content, current antenna pointing content, high-orbit satellite service direction content, low-orbit satellite orbit data content, antenna main lobe reception range content, and service frequency band content of the satellite ground station according to the unified collection time. Link construction information with the same collection time is merged at the same time. Then, the location content, pointing content, direction content, orbit data content, reception range content, and service frequency band content are arranged into the same record in a fixed order. Missing content is marked with missing markers, and for duplicate content, the one with the closest time is retained and the source location marker is added. The categorization and sequential placement of the content corresponding to all collection times are completed continuously to obtain the link construction information record.

[0026] S1.2: Extract the service direction and insert spatial co-location based on the link construction information record, and simultaneously supplement the low-orbit satellite orbit data content to obtain the service line-of-sight direction record; Furthermore, based on the high-orbit satellite service direction content in the link construction information record, direction extraction is performed. The azimuth and elevation content in the high-orbit satellite service direction content are cut out from the corresponding positions in the link construction information record and inserted in tandem with the satellite ground station position content and the current antenna pointing content according to the spatial pointing relationship. This ensures that the satellite ground station position content, the current antenna pointing content, the azimuth content, and the elevation content are continuously positioned along the same service line of sight direction. Then, the low-orbit satellite orbit data content is added to the directional extension positions corresponding to the azimuth and elevation content. All direction chain content formed around the same acquisition time is continuously arranged according to the spatial sequence relationship of the service line of sight direction to obtain the service line of sight direction record.

[0027] It should be noted that the low-Earth orbit (LEO) satellite orbital data is used to characterize the LEO satellite's orbital status and spatial position at the corresponding acquisition time, so as to continue to extrapolate the LEO satellite's position along the operational line of sight.

[0028] S1.3: Based on the azimuth, elevation and antenna main lobe convergence range recorded in the service line of sight direction record, the link field of view and center line of sight position are recorded to form the line of sight convergence corridor record; Furthermore, regarding the azimuth, elevation, and antenna main lobe convergence range content in the service line-of-sight record, the position where the azimuth and elevation content intersect is first written as the central line-of-sight position. Then, along both sides of the central line-of-sight position, the angular boundaries corresponding to the antenna main lobe convergence range content are expanded outwards, and the left and right boundaries of the service line-of-sight direction are respectively marked. The continuous spatial segment covered between the left and right boundaries is written as the link field of view. The central line-of-sight position is then embedded in the middle of the link field of view. The spatial connection between the starting position, ending position, and central line-of-sight position of the link field of view is written segment by segment, so that the link field of view and the central line-of-sight position remain in the same direction and continuously positioned. Finally, the link field of view and the central line-of-sight position are continuously written along the service line-of-sight direction as the line-of-sight convergence corridor record.

[0029] S1.4: Based on the line-of-sight convergence corridor record, write the co-position landing point of the low-orbit satellite continuous time slice and connect the propulsion trajectory to obtain the point-by-point push-out record; Furthermore, based on the link field of view and the central line of sight position in the line-of-sight convergence corridor record, the low-Earth orbit satellite position content corresponding to the low-Earth orbit satellite orbit data content is obtained along the continuous time slices. The low-Earth orbit satellite position content corresponding to each continuous time slice is spatially aligned with the link field of view within the same continuous time slice. The position content falling within the link field of view is written as the landing point within the field of view, the position content continuously approaching the central line of sight position is written as the central approach landing point, and the position content crossing the central line of sight position and continuing to move along the business line of sight direction is written as the centrifugal advancement landing point. The corresponding time content is synchronously written next to each landing point. Then, the position offset direction between adjacent continuous time slices is checked back and forth. The landing points that maintain a continuous advancement relationship between the previous continuous time slice and the next continuous time slice are sequentially connected to form the advancement trajectory. All landing points, corresponding time content, and continuous advancement relationships from entering the link field of view to leaving the link field of view are sequentially written to obtain the point-by-point push arrangement record.

[0030] It should be noted that continuous advancement relationship means that the LEO satellite position content corresponding to the previous continuous time slice and the LEO satellite position content corresponding to the subsequent continuous time slice are connected in the operational line of sight direction. The subsequent position continues to move in the same direction relative to the previous position, entering the link field of view, approaching the center line of sight position, crossing the center line of sight position, or leaving the link field of view, without position jump, time sequence break, or cross-segment switching.

[0031] S1.5: Extract the entry time, center time, and departure time from the point-by-point push record, and write the candidate segment sequence to generate a link traversal candidate chain.

[0032] Furthermore, the position content, corresponding time content, and continuous advancement relationship of each consecutive time slice in the point-by-point push-out record are sequentially checked. The entry time is obtained from the time content corresponding to the position content that first enters the link's field of view. The center time is extracted from the time content that continuously approaches the center line of sight and reaches the minimum deviation position. The departure time is extracted from the time content corresponding to the position content that leaves the link's field of view. Then, the continuous time content between the entry time and the departure time is written into candidate segments, and the position content corresponding to the center time within the candidate segments is written into candidate center positions. Then, the entry time, center time, departure time, candidate segments, candidate center positions, and position content that maintains a continuous advancement relationship within the candidate segments are continuously written into the same candidate chain record in chronological order to generate a link traversal candidate chain.

[0033] S2: Obtain candidate segments in the candidate chain that the link traverses, and extract the front steady-state segment and the rear steady-state segment on both sides of the candidate segment respectively to generate a double-sided traction end record. Simultaneously write the continuous receiving trajectory in the unobstructed state along the candidate segment towards the candidate center position to form an unobstructed reference trajectory record. S2.1: Extract candidate segments from the continuous time content in the candidate chain of link crossing, and perform steady-state time lookup and reception state continuity screening around both sides of the candidate segment to generate a two-sided steady-state segment record; Furthermore, the continuous time boundary between the entry and exit times is located from the continuous time content in the candidate link traversal, and the continuous time content between the entry and exit times is written as a candidate segment. The continuous time content is then traced backward around the starting boundary of the candidate segment, extracting the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth hourly to lock the preceding continuous time segment that maintains continuous and stable changes. Similarly, the continuous time content is traced backward around the ending boundary of the candidate segment, extracting the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth hourly to lock the following continuous time segment that maintains continuous and stable changes. Finally, the continuous reception state of the preceding and following continuous time segments is screened, and the preceding, following, and candidate time segments are written in chronological order to generate a bilateral steady-state segment record.

[0034] It should be noted that the continuity screening of the received state refers to checking the continuity of the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth along the preceding and following continuous time segments, retaining continuous and stable time content, and eliminating time content with sudden jumps, time breaks, and direction reversals.

[0035] S2.2: Based on the records of the two-sided steady-state sections, the traction end locking and candidate center acceptance are performed on the front steady-state section and the rear steady-state section to form the records of the two-sided traction end. Furthermore, based on the dual-sided steady-state segment records, the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth are extracted hourly along the front and rear steady-state segments toward the candidate segment. The received state content that is closest to the candidate segment boundary and maintains continuous and stable change is selected as the front and rear traction ends, respectively. The time interval relationship and directional continuity relationship between the front and rear traction ends and the candidate center position are continuously written. Then, the front traction end, rear traction end, candidate segment, and candidate center position are connected in chronological order to form a dual-sided traction end record.

[0036] S2.3: Perform counter-clockwise backfilling around the candidate section towards the candidate center position around the dual-sided traction end record to form a bidirectional supplementary trajectory record; Furthermore, around the dual-sided traction end records, forward backfilling is carried out hourly from the front traction end towards the candidate center position along the candidate segment, and the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth content that should continue at each moment are added point by point into the candidate segment; then backward backfilling is carried out hourly from the rear traction end towards the candidate center position along the candidate segment, and the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth content that should continue at each moment are added point by point into the candidate segment; the trajectory content formed by forward backfilling and the trajectory content formed by backward backfilling are then connected in a time sequence around the candidate center position to form a bidirectional supplementary trajectory record.

[0037] S2.4: Based on the bidirectional supplementary trajectory record, perform co-position receiving bundle at the candidate center position to form an unobstructed continuous receiving trajectory record; Furthermore, based on the bidirectional rewrite trajectory record, forward and backward rewrite content is cut out hourly from both sides of the candidate segment toward the candidate center position. The received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth content corresponding to the same moment are aligned and pressed together. The forward rewrite endpoint and the backward rewrite start point corresponding to the candidate center position are pressed together to form a junction point. Then, the convergence is expanded around the junction point toward both sides of the candidate segment start and end boundaries. The double-sided overlapping content in the continuous time slices near the candidate center position is merged. The forward rewrite extension order is maintained on the left side of the candidate center position, and the backward rewrite extension order is maintained on the right side of the candidate center position. At the same time, the changes in the receiving direction and amplitude between adjacent time slices are checked. The continuous receiving content corresponding to the candidate center position is retained, the jump breakpoints are removed, and the continuously extended received content in the unobstructed state at each moment in the candidate segment is connected to form an unobstructed continuous receiving trajectory record.

[0038] It should be noted that the changes in the receiving direction and amplitude are used to define the continuous extension state between the received content of the previous time slice and the corresponding time slice within the candidate segment. The receiving direction refers to the direction of change maintained when the received content merges inward or extends outward along both sides of the candidate center position. The amplitude change refers to the magnitude of the change in the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth between adjacent time slices. When the received content of the corresponding time slices remains continuous in the direction of change and there are no sudden jumps, breaks, or reverse swings in the magnitude of change, it is determined that the requirements for the receiving direction and amplitude change are met.

[0039] S2.5: Based on the unobstructed continuous reception trajectory record, perform sequential writing of the unobstructed reception content of each time in the candidate segment together with the content received on both sides to form an unobstructed reference trajectory record. Furthermore, based on the unobstructed continuous reception trajectory record, the unobstructed reception content is cut out hourly from the starting boundary to the ending boundary of the candidate segment, and the candidate segment time content, candidate center position content, received signal strength content, carrier-to-noise ratio content, bit error rate content, and signal bandwidth content corresponding to each moment are arranged item by item. Then, the double-sided acceptance content formed by the extension of the preceding steady-state segment towards the candidate segment is continued before the starting boundary of the candidate segment, and the double-sided acceptance content formed by the reconnection of the following steady-state segment towards the candidate segment is continued after the ending boundary of the candidate segment. The temporal connection and change continuity between the unobstructed reception content and the double-sided acceptance content at each moment within the candidate segment are checked, and all the content that satisfies the continuous acceptance relationship is connected in chronological order to form a continuous reference trajectory, forming an unobstructed reference trajectory record.

[0040] It should be noted that the continuity relationship is used to define the continuous connection state between the preceding steady-state segment, the candidate segment, and the following steady-state segment. When adjacent moments are connected sequentially, and the received signal strength, carrier-to-noise ratio, bit error rate, and signal bandwidth are continuously extended between adjacent moments without any sudden jumps, breaks, reverse swings, or no corresponding landing points, it is determined that the continuity relationship is satisfied.

[0041] S3: Based on the unobstructed reference trajectory record, the measured value at each moment is compared with the unobstructed reference value at the same moment to obtain the total downward trajectory record within the candidate segment. The gradual change influence is eliminated, the sudden residual downward is retained, and the key points of the depression are identified to generate the residual depression chain record. S3.1: Based on the unblocked reference trajectory record, the reference trajectory information is obtained at each moment along the candidate section and the measured value at the same moment is retrieved. The unblocked reference value and the measured value at the same moment are written with double track pressing and candidate center traction convergence to form the same moment alignment record. Furthermore, based on the unobstructed reference trajectory record, the reference trajectory information corresponding to each moment of the candidate segment is extracted hourly from the starting boundary to the ending boundary of the candidate segment, and the measured values ​​at the same moment are retrieved according to the moment content of the candidate segment. Then, the unobstructed reference value and the measured value at the same moment are double-tracked and inscribed around the same moment content of the candidate segment, so that the unobstructed reference value and the measured value at the same moment are adjacent and close together at the same moment position. Then, the content of the candidate center position is embedded in the middle of the candidate segment, and the unobstructed reference value and the measured value at the same moment corresponding to each moment on both sides of the candidate center position are pulled and converged towards the candidate center position. The temporal sequence and numerical continuity of the content corresponding to the adjacent moments before and after the candidate center position are checked, and the unobstructed reference value and the measured value at the same moment that meet the same moment correspondence are arranged continuously in chronological order to form the same moment alignment record.

[0042] S3.2: Based on the same-time alignment record, write out and connect the pressure difference chain of the unblocked reference value and the same-time measured value at each time along the candidate section to form the total downward trajectory record; Furthermore, based on the synchronous positioning record, the reference value without gear and the measured value at the same time are extracted hourly along the candidate segment, and the synchronous pressure difference is written out to obtain the downward difference value corresponding to each time. The downward difference value is then concatenated in chronological order. Then, the downward difference values ​​on both sides around the candidate center position are connected in the same direction. The connection status between adjacent downward difference values ​​is checked, and the downward difference values ​​that extend continuously along the same trend are retained. The downward difference values ​​that are discontinuous, jump, swing back, or cannot be continuously connected are removed. All the retained downward difference values ​​are concatenated in sequence according to the time content of the candidate segment to form the total downward trajectory record.

[0043] S3.3: Perform gradual tailing separation on the downward segment in the total downward trajectory record, remove the slowly extending downward content, and form a sudden residual downward record; Furthermore, when separating the downward segments in the total downward trajectory record by gradual tailing, each segment of downward content cut out continuously by time in the total downward trajectory record is written as a candidate downward segment. The downward difference value corresponding to each time point is extracted hourly from the starting boundary to the ending boundary of the candidate segment. The gradual tailing judgment value is calculated based on the change amplitude, change direction and extension duration of the downward difference value between adjacent time points. The expression for calculating the gradual tail determination value is: ; in, Indicates the first The gradual tailing judgment value corresponding to each candidate downward segment. Indicates the first The number of adjacent time slice pairs that maintain the same direction of change within a candidate downslope segment. Indicates the first The number of consecutive time slices corresponding to each candidate downswing segment. Indicates the first Within the candidate downward segment, the first The difference in decline corresponding to each consecutive time slice Indicates the first Within the candidate downward segment, the first The downward difference corresponding to each consecutive time slice; When the gradual tail determination value When the threshold for determining gradual tailing is not lower than the threshold, the first... Each candidate downward segment is defined as a slowly extending downward segment and separated from the total downward trajectory record. The gradual tailing judgment value... When the value is below the threshold for determining gradual tailing, the first... Each candidate downward segment is retained as the remaining downward content of a sudden entry, thus forming a sudden remaining downward record.

[0044] It should be noted that the threshold for judging the gradual trailing effect (example range: 0.55 to 0.75) is set as follows: the lower limit is set based on the minimum separable boundary between the slowly extending trailing content and the suddenly cutting trailing content in the total trailing trajectory record under unobstructed conditions, and the upper limit is set based on the maximum allowable discrimination boundary of the continuous trailing content in the candidate segment that keeps changing in the same direction and does not misjudge the sudden remaining trailing record when it continues to extend.

[0045] S3.4: Based on the record of sudden remaining decline, lock out the key points of the depression from front to back along the candidate section to form a record of key points of depression; Furthermore, based on the records of sudden and remaining declines, the decline difference, trend, and duration are checked hourly from front to back along the candidate segments. The first moment when the continuous downward exploration begins is locked as the starting point of the continuous decline; the first moment when the decline trend turns into a slight pause at a low level is locked as the trough entry point; the first moment when it breaks away from the low level and begins to rise continuously is locked as the trough exit point; and the moment when the continuous rise ends and rejoins the stable trend is locked as the end point of the continuous rise. The starting point of the continuous decline, the trough entry point, the trough exit point, and the end point of the continuous rise are then connected in chronological order to form a record of key points of the dip.

[0046] S3.5: Based on the key point records of the depression, the sudden remaining decline record is divided into a continuous decline segment, a trough dwell segment and a continuous rebound segment, and written into a residual depression chain record in chronological order.

[0047] Furthermore, based on the key point records of the depressions, the records of sudden residual declines are segmented and cut out along the time sequence corresponding to the candidate segments. The continuous decline segment is written around the continuous time between the starting point of the continuous decline and the entry point of the trough, where the decline difference deepens continuously and maintains the same downward trend. The trough segment is written around the continuous time between the entry point of the trough and the exit point of the trough, where the decline difference stays at a low level and remains concentrated. The trough segment is written around the continuous time between the exit point of the trough and the end point of the continuous rebound, where the decline difference decreases continuously and returns to the stable trend. The continuous rebound segment is written around the continuous time between the exit point of the trough and the end point of the continuous rebound. The continuous decline segment, the trough segment, and the continuous rebound segment, together with the corresponding key points of the depressions, are then connected in chronological order to form a residual depression chain record.

[0048] S4: Perform center-resident concentric writing, leading edge indentation and biting writing, and trailing edge release writing on the link crossing candidate chain and residual concave chain records to form a concentric occupancy locking record; S4.1: Obtain the corresponding position content in the candidate chain and residual concave chain records, perform concentric writing with the candidate center position as the writing base point, and extend the connection relationship to both sides to form a concentric writing base record; Furthermore, the candidate segments, candidate center positions, center times, entry times, and exit times are obtained from the candidate chain traversal data. The corresponding positions for continuous downward segments, trough dwelling segments, and continuous upward segments in the residual concave chain record are also obtained. Simultaneous registration is performed between the center time corresponding to the candidate center position and the time corresponding to the lowest downward position in the trough dwelling segment. The trough dwelling segment position that is successfully registered is determined as the lowest downward dwelling position. Then, the candidate center position is used as the starting point for further analysis. The baseline is established by aligning the candidate center position with the lowest point of decline and holding position. The continuous approaching positions preceding the candidate center position are then sequentially aligned with the positions preceding the continuous decline segment in chronological order. Similarly, the continuous departing positions following the candidate center position are sequentially aligned with the positions following the continuous rebound segment in chronological order. Furthermore, the corresponding positions at the entry and exit times, the candidate center position, and the departure positions are linked with the preceding and following relationships of the continuous decline segment, the trough holding segment, and the continuous rebound segment to form a concentric baseline record.

[0049] S4.2: Based on the concentric writing benchmark record, around the candidate center position and the position content with the lowest drop and continuous residence in the trough residence segment, perform same-position pressing and two-sided opposite convergence to obtain the concentric locking point and form the center residence concentric writing record. Furthermore, based on the concentric writing benchmark record, the candidate center position and the lowest drop dwell position are aligned and pressed together, pressing the corresponding time content to the same dwell core position; then, continuous approach position content and continuous departure position content are cut out from both sides of the candidate center position, and the content before the trough dwell segment and the content after the trough dwell segment are cut out from both sides of the lowest drop dwell position, and converge towards the dwell core position, so that the continuous advancement content and the continuous dwell content maintain continuous continuity; then, the dwell core position is written as the concentric lock point, and the concentric lock point together with the continuous continuity content on both sides is engraved to form the center dwell concentric writing record.

[0050] S4.3: Perform indentation and interlocking of the first half of the concentric writing record of the center residence by continuously approaching and continuously descending content, write the front boundary lock point, and obtain the front edge indentation and interlocking writing record; Furthermore, the continuous approaching and descending content located in front of the concentric lock point in the concentric inscription record is unfolded hourly according to the candidate segment time content. The positional changes of the continuous approaching content advancing towards the concentric lock point and the descending changes of the continuous descending content extending towards the trough are executed and aligned, pressing the approaching position content and descending position content corresponding to the same moment into the same leading edge advancement zone. Then, along the front side of the concentric lock point towards the starting boundary of the candidate segment, the positional and descending relationships between consecutive moments are checked back, and the content that maintains synchronous pressing, synchronous descending, and synchronous approaching is interlocked and inscribed segment by segment. The positions that have not yet formed a stable correspondence in the previous moment, have begun to form a continuous correspondence in the current moment, and continue to maintain the correspondence in subsequent moments are written as the front boundary lock point. Then, all the pressed and interlocked content between the front boundary lock point and the concentric lock point are connected in chronological order to obtain the leading edge pressed and interlocked inscription record.

[0051] It should be noted that the front boundary lock point refers to the position where continuous approaching content and continuous downward content begin to form a continuous correspondence during the advancement of the front edge. The previous adjacent moments have not yet formed a stable correspondence, and the positional succession relationship and the downward succession relationship of this position and its subsequent adjacent moments are continuous.

[0052] S4.4: Based on the indentation and interlocking record of the leading edge, perform the release and disengagement record of the continuous departure and continuous recovery content of the second half, write the rear boundary lock point, and obtain the rear edge release and disengagement record. Furthermore, based on the continuous departure and continuous recovery content behind the concentric lock point in the leading edge interlocking record, the candidate segment time content is expanded hourly. The positional changes of the continuous departure content away from the concentric lock point along the business line of sight and the recovery changes of the continuous recovery content extending outward from the trough exit point are executed and aligned. The departure position content and recovery position content corresponding to the same time are separated and released. The positional and recovery relationships between adjacent times are checked back along the concentric lock point to the candidate segment end boundary. The content that maintains synchronous separation, synchronous recovery and synchronous outward movement is connected segment by segment. The outermost position that is still corresponding in the previous time, stops corresponding at the current time and does not recover in subsequent times is written as the rear boundary lock point. Then, all separation and release content between the concentric lock point and the rear boundary lock point are connected in chronological order to form the rear edge separation and release record.

[0053] It should be noted that the back boundary lock point refers to the position where the continuously departing content and the continuously rising content begin to separate after completing the last correspondence behind the concentric lock point. The correspondence between adjacent moments before this position is still maintained, but the correspondence after this position is no longer restored.

[0054] S4.5: Based on the trailing edge release writing record, obtain the trailing boundary lock point, and combine the concentric lock point and the front boundary lock point to perform sequential sealing and occupancy closure to obtain the concentric occupancy lock record.

[0055] Furthermore, based on the trailing edge release inscription record, the outermost position corresponding to the stop of continuous departure content and continuous recovery content between the concentric lock point and the trailing boundary lock point is located as the trailing boundary lock point. The trailing boundary lock point, the front boundary lock point, and the concentric lock point are arranged into the same occupancy closed chain according to their time sequence. Then, the front edge pressing engagement content, the center-residing concentric inscription content, and the trailing edge release content are sealed end to end. The positional continuity relationship, the temporal continuity relationship, and the occupancy extension order are checked segment by segment. The occupancy content that maintains continuous closure is linked together to obtain the concentric occupancy locking record.

[0056] S5: Based on the co-centric occupancy lock record, back-check the link verification information, remove non-obstruction sources, generate low-orbit satellite obstruction confirmation records, and write records that do not maintain continuous closure as non-obstruction drop records.

[0057] S5.1: Retrieve the link verification information at the corresponding time from the front boundary lock point, the concentric lock point, and the back boundary lock point in the concentric occupancy lock record, and write it sequentially with the occupancy closed chain content to form a link verification back lookup record; Furthermore, focusing on the front boundary lock point, the center lock point, and the back boundary lock point in the co-center occupancy lock record, the carrier lock content, symbol lock content, receive link alarm content, antenna servo offset retention content, rainfall retention content, and atmospheric fluctuation retention content are retrieved point by point according to the corresponding time. The link verification information corresponding to the front boundary lock point, the center lock point, and the back boundary lock point is then attached to the same position in the occupancy closed chain content. Following the progression order of the occupancy closed chain content, the link verification information between the front boundary lock point and the center lock point is continuously connected with the corresponding occupancy closed chain content, and the link verification information between the center lock point and the back boundary lock point is continuously connected with the corresponding occupancy closed chain content. For content with consistent time and position continuity, a sequential connection is performed. All link verification information corresponding to the front boundary lock point, the center lock point, and the back boundary lock point, together with the occupancy closed chain content, are linked together to form a link verification back lookup record.

[0058] It should be noted that the execution of the connection sequence refers to the process of merging and connecting the link verification information at the corresponding moment with the content of the placeholder closed chain according to the time sequence of the front boundary lock point, the concentric lock point and the back boundary lock point in the content of the placeholder closed chain, and maintaining the uninterrupted connection between the front and back.

[0059] S5.2: Verify and review records along the link, identify alarm content of forward-moving through-type receiving link, separate the corresponding independent downlink content, and form alarm removal records; Furthermore, the link verification back-check records are sequentially cut out from the receiving link alarm content corresponding to the front boundary lock point, concentric lock point, and rear boundary lock point in chronological order. The continuous time segment before the content of the occupying closed chain is then checked backward to filter out the receiving link alarm content that existed before the appearance of the front boundary lock point and continued to extend along the front boundary lock point to the front of the concentric lock point. The receiving link alarm content that meets the conditions of forward appearance and continuous penetration is written as forward penetration type receiving link alarm content. Then, the downlink content at the same time is cut out from the time position corresponding to the forward penetration type receiving link alarm content. The independent downlink content that is triggered only by the forward penetration type receiving link alarm content and does not maintain concentric connection with the content of the occupying closed chain is separated segment by segment. The remaining occupying closed chain content and the link verification information that have not been separated are reconnected in chronological order to form an alarm removal record.

[0060] S5.3: Based on the alarm rejection record, retrieve the antenna servo offset stored content, further separate the corresponding content of the previous through-type servo offset, and form a servo rejection record; Furthermore, based on the continuous time segments from the front boundary lock point to the concentric lock point in the alarm removal record, the antenna servo offset storage content is checked point by point, and the offset direction, offset duration, and offset extension range corresponding to each moment are matched with the drop position in the occupancy closed chain content segment by segment. The continuous time content before the front boundary lock point is traced back further, and the antenna servo offset storage content that existed continuously before the formation of continuous drop and maintained a continuous extension along the front side from the front boundary lock point to the concentric lock point is screened out. The content that meets the conditions of continuous storage and previous segment penetration is written as the corresponding content of the previous storage penetration type servo offset. Then, the drop content at the same moment is cut out along the time position corresponding to the previous storage penetration type servo offset content. The drop part that is only brought out by the previous storage penetration type servo offset content is separated segment by segment, and the remaining occupancy closed content after separation is connected in time order to form a servo removal record.

[0061] It should be noted that tracing back the continuous time content before the previous boundary lock point means taking the position corresponding to the previous boundary lock point as the starting point, checking the antenna servo offset retention content at earlier times hour by hour, and retaining the continuous and uninterrupted content, thereby determining the range of continuous existence of the antenna servo offset retention content before the drop in price.

[0062] S5.4: Based on the servo-removed records, check the rainfall and atmospheric fluctuation records, and further separate the slow decline caused by continuous slow descent and fluctuations to form a closed verification record; Furthermore, in the continuous time segment corresponding to the front boundary lock point to the back boundary lock point in the servo-removed record, the rainfall and atmospheric fluctuation records are checked point by point, and the rainfall and atmospheric fluctuation trends corresponding to each moment are matched with the downward trend in the occupancy closed chain content segment by segment. Based on the change continuity between adjacent moments, the downward content that continues to slowly decline and extends gently along multiple consecutive moments is screened out and written as the slow downward content caused by continuous slow descent. Then, the downward content that swings up and down around the same low position and fluctuates back and forth along multiple consecutive moments is screened out and written as the slow downward content caused by fluctuation. The slow downward content caused by continuous slow descent and the slow downward content caused by fluctuation are further separated from the servo-removed record segment by segment, and the remaining occupancy closed content after separation is connected in chronological order to form a closed verification record.

[0063] S5.5: Regarding the closure verification record, verify whether the front boundary lock point, concentric lock point and back boundary lock point still maintain continuous closure. Write the content that meets the continuous closure condition as the low-orbit satellite occlusion confirmation record, and write the content that does not meet the continuous closure condition as the non-occlusion drop record.

[0064] Furthermore, focusing on the front boundary lock point, concentric lock point, and back boundary lock point in the closed verification record, the pre-segment occupancy content between the front boundary lock point and the concentric lock point, the center dwell content corresponding to the concentric lock point, and the post-segment occupancy content between the concentric lock point and the back boundary lock point are checked point by point in chronological order. Simultaneously, the carrier lock content, symbol lock content, position continuation content, and time continuity content at the corresponding time are checked. The pre-segment occupancy content, center dwell content, and post-segment occupancy content that are all connected end to end, do not swing back in direction, do not interrupt time, and do not break the occupancy chain are merged into the same closed chain and written together with the front boundary lock point, concentric lock point, and back boundary lock point as a low-orbit satellite obstruction confirmation record. For content with interrupted continuation, position jump, time gap, or broken occupancy chain, the corresponding downslope content is cut out according to the break position and written as a non-obstruction downslope record.

[0065] It should be noted that the continuous closure condition means that the preceding occupancy content, the center dwell content, and the following occupancy content can be connected end to end, and the carrier-locked content, symbol-locked content, position-accepting content, and time-continuous content remain continuous, without directional swing, position jump, time gap, or breakage of the occupancy chain.

[0066] In summary, this invention achieves unobstructed reference trajectory reconstruction through dual-sided traction end supplementation and co-positioning, which is used for satellite communication link benchmark restoration and improves the targeting of descent identification. Through concentric occupancy locking and non-obstruction source elimination, it achieves obstruction closure verification, which is used to distinguish between low-orbit obstruction and alarm, servo, and rain attenuation disturbances, thereby improving the accuracy of low-orbit satellite obstruction signal determination.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for determining signal obstruction by a low-Earth orbit satellite from a satellite ground station, characterized in that, include: Collect link construction information of satellite ground stations, establish a line-of-sight convergence corridor around the operational line of sight from satellite ground stations to high-orbit satellites, and sort out the links point by point to form candidate links for traversal; The candidate segments in the candidate chain are obtained. The front steady-state segments and the rear steady-state segments are respectively intercepted on both sides of the candidate segments to generate a dual-sided traction end record. The continuous receiving trajectory in the unobstructed state is synchronously written along the candidate segments to the candidate center position to form an unobstructed reference trajectory record. Based on the unobstructed reference trajectory record, the measured value at each moment is compared with the unobstructed reference value at the same moment to obtain the total downward trajectory record within the candidate segment. The gradual change influence is eliminated, the sudden residual downward is retained, and the key points of the depression are identified to generate the residual depression chain record. The records of link crossing candidate chains and residual concave chains are written with center dwelling concentric writing, leading edge indentation and biting writing and trailing edge release writing to form concentric occupancy and locking records. By reviewing the link verification information based on the co-centric occupancy lock record, non-obstruction sources are eliminated, low-orbit satellite obstruction confirmation records are generated, and records that do not maintain continuous closure are written as non-obstruction drop records.

2. The method for determining low-orbit satellite signal obstruction by a satellite ground station as described in claim 1, characterized in that, The establishment of the visual convergence corridor is specifically as follows: The link construction information of the satellite ground station is collected at the same time and written sequentially to obtain the link construction information record; Based on the link construction information record, the business direction is extracted and spatially aligned is inserted, and the low-orbit satellite orbit data content is simultaneously added to obtain the business line-of-sight direction record; The link field of view and center line of view position are recorded by delineating the azimuth, elevation and antenna main lobe convergence range in the business line of view direction record, thus forming a line of view convergence corridor record.

3. The method for determining low-orbit satellite signal obstruction by a satellite ground station as described in claim 1, characterized in that, The process of forming a link traversing the candidate chain is as follows: Based on the line-of-sight convergence corridor record, the co-position landing point of the low-orbit satellite continuous time slice is written and the propulsion trajectory is connected to obtain the point-by-point push-out record; The entry time, center time, and departure time are extracted from the point-by-point push record, and candidate segments are written in sequence to generate a link traversal candidate chain.

4. The method for determining signal obstruction by a low-orbit satellite by a satellite ground station as described in claim 3, characterized in that, The generation of bilateral traction end records is as follows: Candidate segments are extracted from the continuous time content in the candidate chain of link crossing, and steady-state time lookup and reception state continuity screening are performed around both sides of the candidate segments to generate bilateral steady-state segment records. Based on the records of the two-sided steady-state sections, traction end locking and candidate center acceptance are performed on the front and rear steady-state sections to form the two-sided traction end records.

5. The method for determining low-orbit satellite signal obstruction by a satellite ground station as described in claim 1, characterized in that, The formation of the unblocked reference trajectory record is as follows: Around the dual-sided traction end records, perform counter-clockwise backfilling along the candidate section toward the candidate center position to form a bidirectional supplementary trajectory record; Based on the bidirectional rewriting trajectory record, the same-position receiving bundle is executed at the candidate center position to form an unobstructed continuous receiving trajectory record. Based on the unobstructed continuous reception trajectory record, the unobstructed reception content of each time step in the candidate segment, together with the content received on both sides, is sequentially written to form an unobstructed reference trajectory record.

6. The method for determining low-orbit satellite signal obstruction by a satellite ground station as described in claim 1 or 5, characterized in that, The total downward trajectory record within the candidate segment is obtained as follows: Based on the unblocked reference trajectory record, reference trajectory information is obtained at each moment along the candidate section and the measured value at the same moment is retrieved. The unblocked reference value and the measured value at the same moment are written by double track pressing and candidate center traction convergence to form the same moment alignment record. Based on the synchronous alignment record, the pressure difference chain of the reference value without a stop and the measured value at the same time along the candidate section is written out and connected in series to form the total downward trajectory record.

7. The method for determining signal obstruction by a low-orbit satellite from a satellite ground station as described in claim 1, characterized in that, The generation of residual concave chain records is specifically as follows: The downward segment in the total downward trajectory record is gradually stripped of its trailing edge, removing the slowly extending downward content to form a sudden remaining downward record; Based on the record of sudden remaining decline, the key points of the depression are locked out from front to back along the candidate section to form a record of key points of depression. Based on the key point records of the depression, the sudden remaining decline record is divided into a continuous decline segment, a trough dwell segment, and a continuous rebound segment, and then written into a residual depression chain record in chronological order.

8. The method for determining signal obstruction by a low-orbit satellite by a satellite ground station as described in claim 1, characterized in that, The formation of the concentric occupant locking record is as follows: Obtain the corresponding position content in the link crossing candidate chain and residual concave chain records, perform concentric writing with the candidate center position as the writing base point, and extend the connection relationship to both sides to form a concentric writing base record; Based on the concentric writing benchmark record, around the candidate center position and the position content with the lowest degree of decline and continuous residence in the trough residence segment, perform same-position pressing and two-sided opposite convergence to obtain the concentric locking point and form the center residence concentric writing record. The first half of the continuous approach content and continuous downward content of the central residence concentric inscription record are indented and interlocked, and the front boundary lock point is written to obtain the front edge indented and interlocked inscription record. Based on the indentation and interlocking record of the leading edge, the release and disengagement record of the continuous departure and continuous rise content of the second half is written, the rear boundary lock point is written, and the rear edge release and disengagement record is obtained. Based on the trailing edge release writing record, the trailing boundary lock point is obtained, and combined with the concentric lock point and the front boundary lock point, a sequential sealing and occupancy closure are performed to obtain the concentric occupancy lock record.

9. The method for determining signal obstruction by a low-orbit satellite by a satellite ground station as described in claim 8, characterized in that, The process of removing sources that are not obstructed is as follows: The link verification information at the corresponding time is retrieved from the front boundary lock point, the concentric lock point and the back boundary lock point in the concentric occupancy lock record, and written in sequence with the occupancy closed chain content to form a link verification back lookup record; Verify and review records along the link, identify alarm content of forward-moving through-type receiving link, separate the corresponding independent downlink content, and form alarm removal records; Based on the alarm removal record, the antenna servo offset stored content is retrieved, and the corresponding content of the previous through-type servo offset is further separated to form a servo removal record.

10. The method for determining signal obstruction by a low-orbit satellite by a satellite ground station as described in claim 9, characterized in that, The process of writing records that do not maintain continuous closure as unoccluded dropout records is as follows: Based on the servo-removed records, the rainfall and atmospheric fluctuation records are checked, and the records of continuous slow descent and slow decline caused by fluctuations are further separated to form a closed verification record. Regarding whether the closure verification record maintains continuous closure between the pre-boundary locking point, concentric locking point, and post-boundary locking point, the content that meets the continuous closure condition is written as the low-orbit satellite occlusion confirmation record, and the content that does not meet the continuous closure condition is written as the non-occlusion drop record.

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