Synchronous orbit belt target search method and device

Abstract

The present invention provides a synchronous orbit belt target search method and device thereof. The search method comprises: dividing a set search area into a search hour angle-declination grid, the search hour angle-declination grid comprises a plurality of hour angle strips, and each hour angle strip comprises a plurality of declination grid blocks; taking the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area as reference, correcting the position of the hour angle strip, so that each corrected hour angle strip is located within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target dense distribution area; performing optical visibility judgment on each declination grid block on each corrected hour angle strip, and using a telescope to search for synchronous orbit belt targets when the declination grid block meets the optical visibility condition. The method can be effectively applied to the search and observation of synchronous orbit belt targets by optical telescopes, and effectively improves the target search efficiency and data quality.

Description

Technical Field

[0001] The present invention relates to the field of optical observation technology in space situational awareness, and in particular to a synchronous orbit belt target search method and device thereof. Background Art

[0002] As space activities become more frequent, the amount of space debris is also gradually increasing. Although most of the space debris is distributed in the low earth orbit (LEO), a considerable part of it is also in the geosynchronous orbit (GEO). In the GEO orbit, there is no atmospheric resistance to lower its orbit, and there is no available means of removal, which leads to the increasingly crowded orbit in the GEO orbit, posing a great threat to spacecraft operating in this orbit.

[0003] The orbit of GEO targets is basically maintained at 36,000 km. The radar signal attenuates greatly with the length of distance. Therefore, the cost-effectiveness of using radar to detect GEO targets in high orbit is low. The use of optical telescopes to observe GEO targets is the preferred means of observation, and the telescope's search observation mode is the most efficient method for GEO cataloging and new target discovery.

[0004] Traditional ground-based telescope search methods use large-scale blind searches over a large sky area. This method is only advantageous for telescopes with very large fields of view. Using small or medium-sized field of view telescopes will result in insufficient coverage of the sky area on a single observation night, which is inefficient. Alternatively, in the right ascension and declination coordinate system, a fixed declination belt method is used for interception search, but there are problems such as insufficient coverage of the sky area or repeated searches, and observation data that is too short or too long. Summary of the invention

[0005] Based on the above problems, the main purpose of the present invention is to solve the shortcomings of the above-mentioned prior art, make full use of the kinematic laws of GEO targets, and provide a synchronous orbit belt target search method and device, which can dynamically adjust the search area for GEO targets, thereby realizing efficient search.

[0006] On one hand, the present invention provides a method for searching for targets in a synchronous orbit belt, comprising: dividing a set search area into a search time angle-declination grid, the search time angle-declination grid comprising a plurality of time angle strips, each time angle strip comprising a plurality of declination grid blocks; using a synchronous orbit belt target envelope curve and a synchronous orbit belt target densely distributed area as references, correcting the position of the time angle strips so that each corrected time angle strip is located within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target densely distributed area; performing optical visibility judgment on each declination grid block on each corrected time angle strip, and using a telescope to search for synchronous orbit belt targets on the declination grid block when the declination grid block meets the optical visibility conditions.

[0007] According to an embodiment of the present invention, dividing a set search area into search hour angle-declination grids includes: setting an hour angle range and a declination range of the search area and a field of view parameter of the telescope in a station hour angle-declination coordinate system, wherein the field of view parameter is used to characterize the field of view size of a non-overlapping part of the telescope; dividing the hour angle range into a plurality of hour angle strips according to the field of view parameter; and dividing each hour angle strip into a plurality of declination grid blocks according to the field of view parameter and the declination range.

[0008] According to an embodiment of the present invention, with the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area as reference, the position of each hour angle strip is corrected, including: determining the median value of the synchronous orbit belt target envelope curve corresponding to each hour angle strip in the station center coordinate system; determining the distribution value of the synchronous orbit belt target dense distribution area in the station center coordinate system; comparing the difference between the median and the distribution value in each hour angle strip with the half span value of the synchronous orbit belt target envelope curve, and correcting the declination position of the hour angle strip according to the comparison result.

[0009] According to an embodiment of the present invention, determining the median of the synchronous orbit belt target envelope curve corresponding to each hour angle strip in the station-centered coordinate system includes: determining the synchronous orbit belt target envelope curve in the geocentric inertial coordinate system; obtaining, through coordinate conversion, a non-continuous sequence of hour angle declination envelope of the median line of the synchronous orbit belt target envelope curve in the station-centered coordinate system; and interpolating the non-continuous sequence of hour angle declination envelope to obtain the median of the synchronous orbit belt target envelope curve.

[0010] According to an embodiment of the present invention, interpolating a non-continuous sequence of hour angle declination envelope to obtain the median of the target envelope curve of the synchronous orbit belt includes: performing cubic curve interpolation processing on the non-continuous sequence of hour angle declination envelope to obtain the median of the target envelope curve of the synchronous orbit belt.

[0011] According to an embodiment of the present invention, the declination grid block meets the optical visibility conditions including: the declination grid block meets the sky light and earth shadow conditions and the minimum elevation angle conditions, the sky light and earth shadow conditions characterize that the declination grid block is in the sunlight area and is not blocked by the earth, and the minimum elevation angle conditions characterize that the declination grid block is set above the minimum elevation angle of the telescope.

[0012] According to an embodiment of the present invention, the declination grid block meets the optical visibility condition and also includes: the declination grid block also meets at least one of the moon avoidance condition and the Milky Way avoidance condition, the moon avoidance condition characterizes that the observation angle between the moon and the declination grid block relative to the telescope is greater than the set moon avoidance angle, and the Milky Way avoidance condition characterizes that the galactic latitude of the declination grid block in the Milky Way coordinate system is greater than the set Milky Way avoidance angle.

[0013] According to an embodiment of the present invention, searching for synchronous orbital band targets in declination grid blocks using a telescope includes: determining a declination path of the telescope according to a set number of traversals, the declination path including an increasing search path and a decreasing search path.

[0014] According to an embodiment of the present invention, the method for searching for targets in a synchronous orbit belt further includes: when each declination grid block does not meet the optical visibility condition, adjusting the starting search time of the telescope, and performing optical visibility judgment on the declination grid block again according to the adjusted starting search time.

[0015] On the other hand, the present invention provides a synchronous orbit belt target search device, including: a division module, used to divide the set search area into a search time angle-declination grid, the search time angle-declination grid includes multiple time angle strips, and each time angle strip contains multiple declination grid blocks; a correction module, used to correct the position of the time angle strip with reference to the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area, so that each corrected time angle strip is located within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target dense distribution area; a judgment module, used to perform optical visibility judgment on each declination grid block on each corrected time angle strip, and when the declination grid block meets the optical visibility condition, use a telescope to search for synchronous orbit belt targets on the declination grid block.

[0016] The synchronous orbit target search method and device of the embodiment of the present invention divides the search area into a search time angle-declination grid, uses the synchronous orbit target envelope curve and the synchronous orbit target dense distribution area as a reference, that is, fully utilizes the movement law of the target in the geosynchronous orbit area, and dynamically adjusts the search area of ​​the divided search time angle-declination grid, which can ensure that the search range covers all possible target areas and avoids unnecessary search blanks or repeated searches, thereby greatly improving the accuracy and pertinence of the search. By judging the optical visibility of each declination grid block, it is simple and highly operable, which not only saves the use of observation resources such as telescopes, but also improves the efficiency and success rate of the search. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0018] Figure 1 A flowchart of a synchronous orbit belt target search method according to an embodiment of the present invention is schematically shown;

[0019] Figure 2 A modified comparison diagram of the hour angle strip according to an embodiment of the present invention is schematically shown;

[0020] Figure 3 A block diagram of a synchronous orbit zone target search device according to an embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0021] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0022] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0023] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0024] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0025] Figure 1 The flowchart of the synchronous orbit belt target search method according to an embodiment of the present invention is schematically shown.

[0026] like Figure 1 As shown, the synchronous orbit band target searching method may include operations S110 to S130.

[0027] In operation S110, the set search area is divided into a search hour angle-declination grid, the search hour angle-declination grid includes a plurality of hour angle strips, and each hour angle strip includes a plurality of declination grid blocks.

[0028] The search area can be set, for example, based on historical search conditions or experience data.

[0029] In operation S120, the position of the time angle strip is corrected with reference to the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area, so that each corrected time angle strip is located within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target dense distribution area.

[0030] The target envelope curve of synchronous orbit can represent the specific trajectory or envelope formed by a series of synchronous orbit targets. This curve can be used to describe the dynamic distribution or movement law of these targets on the orbit. The target dense distribution area of ​​synchronous orbit represents the area where the number of targets on the synchronous orbit is relatively concentrated or dense. The target envelope curve of synchronous orbit and the target dense distribution area of ​​synchronous orbit represent the most extensive area where synchronous orbit targets may exist and the area where targets are most likely to exist densely, respectively, which can be obtained through historical experience data.

[0031] In operation S130, optical visibility is determined for each declination grid block on each corrected hour angle strip, and when the declination grid block meets the optical visibility condition, a telescope is used to search for synchronous orbital targets on the declination grid block.

[0032] This embodiment divides the search area into search hour angle-declination grids, uses the synchronous orbit target envelope curve and the synchronous orbit target dense distribution area as a reference, that is, fully utilizes the movement law of the target in the geosynchronous orbit area, and dynamically adjusts the search area for the divided search hour angle-declination grid, which can ensure that the search range covers all possible target areas and avoids unnecessary search blanks or repeated searches, thereby greatly improving the accuracy and pertinence of the search. By performing optical visibility judgment on each declination grid block, it is simple and highly operable, which not only saves the use of observation resources such as telescopes, but also improves the efficiency and success rate of the search.

[0033] In some embodiments, in operation S110, dividing the set search area into search hour angle-declination grids may include: setting the hour angle range and declination range of the search area and the field of view parameters of the telescope in the station hour angle-declination coordinate system, the field of view parameters being used to characterize the field of view size of the non-overlapping part of the telescope; dividing the hour angle range into a plurality of hour angle strips according to the field of view parameters; and dividing each hour angle strip into a plurality of declination grid blocks according to the field of view parameters and the declination range.

[0034] In some cases, the field of view of a telescope may not be completely continuous, but may consist of multiple non-overlapping parts. Considering the size of the field of view of these non-overlapping parts can ensure that the search area is adequately covered. As an example, the field of view parameters can be determined by the telescope optical field of view FOV, the overlap field ratio, Calculated.

[0035] In the station hour angle-declination coordinate system, the hour angle (HA) range and declination (Dec) range of the search area can be expressed as .

[0036] Divide the hour angle range into multiple hour angle strips, which can be calculated using the following formula:

[0037]

[0038] Where N ha represents the number of hour angle strips, Ceil represents the rounding function, ha max、 ha min Indicates the maximum and minimum hour angle values. The hour angle strip can be recorded as .

[0039] Divide each hour angle strip into multiple declination grid blocks, which can be calculated by the following formula:

[0040]

[0041] Where N dec Indicates the number of declination grid blocks in one hour angle strip, dec max、 dec min Indicates the maximum and minimum declination values. The declination grid block can be recorded as .

[0042] The hour angle strips and declination grid blocks together form grids, with the center of each grid pointing to It can be expressed as:

[0043] ,

[0044] .

[0045] By dividing the set search area into search hour angle-declination grids, astronomical observations or satellite tracking tasks can be performed more systematically and efficiently, which helps to avoid duplicate observations and missed observations, thereby improving observation efficiency. It is also conducive to grid correction processing.

[0046] In some embodiments, in operation S120, with the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area as reference, correcting the position of each hour angle strip may include: determining the median value of the synchronous orbit belt target envelope curve corresponding to each hour angle strip in the station center coordinate system; determining the distribution value of the synchronous orbit belt target dense distribution area in the station center coordinate system; comparing the difference between the median and the distribution value in each hour angle strip with the half span value of the synchronous orbit belt target envelope curve, and correcting the declination position of the hour angle strip according to the comparison result.

[0047] In some embodiments, determining the median value of the synchronous orbit belt target envelope curve corresponding to each hour angle strip in the station-centered coordinate system may include: determining the synchronous orbit belt target envelope curve in the geocentric inertial coordinate system; obtaining, through coordinate conversion, a non-continuous sequence of hour angle declination envelope of the midline of the synchronous orbit belt target envelope curve in the station-centered coordinate system; and interpolating the non-continuous sequence of hour angle declination envelope to obtain the median value of the synchronous orbit belt target envelope curve.

[0048] As an example, the initial start and end times of the current telescope observation can be calculated based on the sky light constraint parameter, that is, the altitude angle of the sun relative to the telescope station, which can be expressed as .

[0049] According to the empirical formula, the right ascension and declination envelope curve of the synchronous orbit target in the geocentric inertial coordinate system can be taken as follows:

[0050]

[0051] In the formula, ra represents the geocentric right ascension, dec represents the geocentric right ascension, high ,dec low Indicates the upper and lower boundary values ​​of the envelope curve. It can be taken as the geocentric right ascension The appropriate arithmetic progression value within the range, and the reference height of the synchronous orbit belt target , using the telescope's site parameters , through the hour angle declination coordinate conversion, we can get The midline of the moment envelope curve The hour angle declination envelope is a discontinuous sequence in the station center coordinate system. Since the target can be in different positions at different times, the obtained hour angle declination sequence can be discontinuous. Any hour angle strip can be obtained by interpolation Lower target envelope curve median For example, cubic curve interpolation can be used to estimate the value of unknown points through known data points to obtain a smooth curve.

[0052] The area with a dense synchronous orbit belt can be taken as the area with a declination of 0° in the geocentric inertial coordinate system, that is, the equatorial plane, and the distribution value of the densely distributed GEO area in the station-centered coordinate system is It can be expressed as follows:

[0053]

[0054] Next, compare the median value of each hour angle strip and distribution value The difference between the half span value of the target envelope curve of the synchronous track The half span value can be half of the maximum width of the target envelope curve in a certain dimension.

[0055] For example, when , the following judgment can be made: If , then the center point of the declination grid on the corrected hour angle band can be expressed as ;like , then the center point of the declination grid on the corrected hour angle band can be expressed as .

[0056] when , then the center point of the declination grid on the corrected hour angle band can be expressed as .

[0057] The above-mentioned embodiment can more accurately determine the position and range of the observed target by referring to the target envelope curve and densely distributed area of ​​the synchronous orbit, which helps to reduce the waste of observation resources, improve the targetedness of observation, and thus realize dynamic adjustment of the observation area.

[0058] Figure 2 The modified comparison diagram of the hour angle strip according to the embodiment of the present invention is schematically shown.

[0059] like Figure 2As shown, the two curves of 7.5° and -7.5° can form the synchronous orbit belt target envelope curve, and the 0° line can be the GEO dense distribution area. The time angle strips A, B, and C are the initial time angle strips formed after the search area is divided. It can be seen that some grids of the time angle strips A and B are not within the scope of the envelope curve. The grids that are not within the scope of the envelope grid line usually do not have synchronous orbit belt targets that need to be searched. Searching this part of the grid outside the envelope curve will waste search resources. To this end, according to the correction method of this embodiment, the time angle strips A and B can be moved in the direction of -7.5° respectively to obtain the time angle strips A' and B'. The center point of the declination grid after the move can be calculated according to the formula in the above text, which will not be repeated here. The grids of the time angle strip C are all within the scope of the envelope curve and cover the 0° line, so no correction is required. In this way, by selectively correcting the position of the time angle strips, it can be ensured that each time angle strip is within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target dense distribution area. It should be noted that for ease of observation, Figure 2 The corrected hour angle strips A' and B' are offset from the corrected hour angle strips A and B. In fact, the hour angle strips before and after correction are on the same straight line. The hour angle strip C does not need to be corrected. In order to compare with the hour angle strips A' and B', the hour angle strip C' is still drawn and the hour angle strip C' is also offset from the hour angle strip C.

[0060] Please continue reading Figure 1 In some embodiments, the declination grid block in operation S130 meets the optical visibility condition, which may include: the declination grid block meets the sky light and earth shadow condition and the minimum elevation angle condition, the sky light and earth shadow condition indicates that the declination grid block is in the sunlight area and is not blocked by the earth, and the minimum elevation angle condition indicates that the declination grid block is set above the minimum elevation angle of the telescope. Otherwise, the declination grid block is not visible.

[0061] On the basis of the above embodiment, the declination grid block meeting the optical visibility condition may further include: the declination grid block also meeting at least one of the moon avoidance condition and the galaxy avoidance condition, the moon avoidance condition indicating that the observation angle between the moon and the declination grid block relative to the telescope is greater than the set moon avoidance angle, and the galaxy avoidance condition indicating that the galactic latitude of the declination grid block in the galaxy coordinate system is greater than the set galaxy avoidance angle. Otherwise, the declination grid block is not visible.

[0062] By comprehensively considering the conditions of the earth's shadow, the lowest elevation angle, the moon's avoidance, and the Milky Way's avoidance, we can select declination grid blocks that meet the optical visibility conditions, thereby improving the accuracy and reliability of the observation data. At the same time, we can more reasonably arrange the observation time and the use of the telescope, avoid observations under unfavorable conditions, and reduce the waste of observation resources.

[0063] In this embodiment, if the target area is optically visible, the start time of the observation plan can be set to = , the starting shooting direction is , and can shoot frames according to the set sky area and exposure time , determine the time to stay in this area .

[0064] If the target area is not visible optically, the adjacent grids on the time angle strip can be determined. , repeat the optical visibility judgment until the observable initial position is found.

[0065] If all grids on the time angle strip cannot be observed, you can switch to the next time angle strip. , continue to perform optical visibility judgment until an observable initial position is found.

[0066] Based on the above embodiment, when each declination grid block does not meet the optical visibility condition, that is, when all grids cannot be observed, the starting search time of the telescope can be adjusted, and the optical visibility of the declination grid block can be judged again according to the adjusted starting search time.

[0067] For example, if the entire grid cannot be observed, the starting time can be increased by an exposure time, that is, , continue to perform optical visibility judgment until an observable initial position is found.

[0068] Please continue reading Figure 1 Based on the above embodiment, using the telescope to search for synchronous orbital targets in the declination grid block in operation S130 may include: determining the declination path of the telescope according to the set number of traversals, and the declination path includes an increasing search path and a decreasing search path.

[0069] After the optical visibility of the declination grid is determined, the initial shooting grid position of the telescope and the current time can be determined , poll the next adjacent grid .

[0070] In a time angle band, when the telescope has finished photographing the declination grid position on the time angle band After that, the next shooting position and declination path can be determined by the number of traversals of the telescope. , then the next grid position is , the declination path becomes a descending search.

[0071] If the number of traversals , then according to the number of traversals After completing one time angle band, switch to the next adjacent time angle band. , the next shooting position and declination path are determined by the number of telescope traversals.

[0072] When shooting in the next adjacent hour angle band, , that is, the number of traversals is an odd number, then the next grid position is , the declination path becomes a decreasing search; when , that is, the number of traversals is an even number, then the next grid position is , the declination position is searched in ascending order.

[0073] After the polling has completed the entire search area, if , that is, the current time is less than the end time, then the search area will be polled in the reverse direction, that is, polling Repeat the above increasing or decreasing search operation until the observation of all start and end time periods is completed. .

[0074] In the above embodiment, by setting the number of traversals and planning the declination path, the telescope can search systematically, improve search efficiency, and shorten observation time. The combination of increasing and decreasing search paths can ensure that the telescope fully covers the declination grid blocks and improve the accuracy of the observation results. In addition, by setting a reasonable search strategy, this embodiment can more efficiently utilize the observation resources and time of the telescope, reduce observation costs, and improve resource utilization efficiency.

[0075] Based on the above multiple embodiments, the present invention lists a specific embodiment to illustrate the advantages of the present invention. In this specific embodiment, the telescope field of view is set , Overlapping field ratio , the geographical location of the station , the hour angle and declination range of the search area , the solar altitude angle at the start and end of the observation is -8°, the moon avoidance angle is 30°, the Milky Way avoidance angle is 10°, the minimum observation elevation angle is 15°, and the exposure time (including readout time), sky zone switching time 、Sky area shooting frame number , traversal times .

[0076] For example, the observation date is March 20, 2023, and 996 GEO targets with a mean motion of [0.99, 1.01] and an eccentricity less than 0.01 are selected from the public database. Considering the same optical observation constraints in the present invention, the station can observe 376 targets after simulation calculation. It is defined that if the target is photographed 4 times out of 6 traversals, it is defined as observable. The observation results according to the strategy of the present invention are shown in Table 1 below.

[0077] Table 1 Comparison of the number of targets observed by the present invention and other methods

[0078]

[0079] As can be seen from the table, the method of the present invention uses a single telescope with a 2.6-degree field of view to achieve observation of most GEO targets in the visible area in one observation night. The average observation time for each arc segment is about 336 seconds, which effectively supports subsequent data processing. If the tracking method in the existing method is adopted, a target can only be observed for more than 100 times in the same arc segment time, while the method of the present invention can observe a total of 319 targets. In addition, compared with the total number of 274 targets observed without the dynamic area transformation method in the present invention, the method of the present invention improves the overall efficiency of single night observation by about 12%. In addition, the number of targets observed twice in the method of the present invention has increased from 137 to 189. The improvement in the number and quality of these target arc segments will also improve the orbit determination accuracy of the single target station, facilitating subsequent tracking observations and cataloging processing.

[0080] Figure 3 A block diagram of a synchronous orbit zone target search device according to an embodiment of the present invention is schematically shown.

[0081] like Figure 3 As shown, the synchronous orbit belt target search device 300 of this embodiment includes a division module 310, a correction module 320, and a judgment module 330.

[0082] The division module 310 is used to divide the set search area into a search hour angle-declination grid, where the search hour angle-declination grid includes a plurality of hour angle strips, each of which includes a plurality of declination grid blocks. In one embodiment, the division module 310 can be used to perform the operation S110 described above, which will not be described in detail herein.

[0083] The correction module 320 is used to correct the position of the time angle strip with reference to the synchronous track belt target envelope curve and the synchronous track belt target dense distribution area, so that each corrected time angle strip is located within the synchronous track belt target envelope curve and covers the synchronous track belt target dense distribution area. In one embodiment, the correction module 320 can be used to perform the operation S120 described above, which will not be repeated here.

[0084] The judgment module 330 is used to judge the optical visibility of each declination grid block on each corrected hour angle strip, and when the declination grid block meets the optical visibility condition, the declination grid block is searched for the synchronous orbital belt target using a telescope. In one embodiment, the judgment module 330 can be used to perform the operation S130 described above, which will not be repeated here.

[0085] In some embodiments, the judgment module 330 may also be used to adjust the starting search time of the telescope when each declination grid block does not meet the optical visibility condition, and perform optical visibility judgment on the declination grid block again according to the adjusted starting search time.

[0086] According to an embodiment of the present invention, any multiple modules in the partition module 310, the correction module 320, and the judgment module 330 can be combined into one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module. According to an embodiment of the present invention, at least one of the partition module 310, the correction module 320, and the judgment module 330 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application-specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation methods of software, hardware, and firmware, or in any appropriate combination of any of them. Alternatively, at least one of the partition module 310, the correction module 320, and the judgment module 330 can be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding function can be executed.

[0087] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for searching for a target in a synchronous orbit, characterized in that: include: Dividing the set search area into a search hour angle-declination grid, wherein the search hour angle-declination grid includes a plurality of hour angle strips, and each of the hour angle strips includes a plurality of declination grid blocks; With reference to the target envelope curve of the synchronous orbit belt and the target densely distributed area of ​​the synchronous orbit belt, the position of the hour angle strip is corrected so that each of the corrected hour angle strips is located within the target envelope curve of the synchronous orbit belt and covers the target densely distributed area of ​​the synchronous orbit belt; with reference to the target envelope curve of the synchronous orbit belt and the target densely distributed area of ​​the synchronous orbit belt, the position of each hour angle strip is corrected, including: determining the median value of the target envelope curve of the synchronous orbit belt corresponding to each hour angle strip in the station center coordinate system; determining the median value of the target envelope curve of the synchronous orbit belt corresponding to each hour angle strip in the station center coordinate system includes: determining the target envelope curve of the synchronous orbit belt in the geocentric inertial coordinate system; obtaining the hour angle declination envelope discontinuous sequence of the median line of the target envelope curve of the synchronous orbit belt in the station center coordinate system through coordinate conversion; interpolating the hour angle declination envelope discontinuous sequence to obtain the median value of the target envelope curve of the synchronous orbit belt; determining the distribution value of the target densely distributed area of ​​the synchronous orbit belt in the station center coordinate system, and the distribution value is expressed as: , wherein R represents the reference height of the synchronous orbit band target, B represents the latitude of the telescope, and H represents the elevation of the telescope; comparing the difference between the median value and the distribution value under each of the hour angle strips with the half span value of the envelope curve of the synchronous orbit band target, and correcting the declination position of the hour angle strip according to the comparison result; The optical visibility of each of the declination grid blocks on each of the corrected hour angle strips is judged, and when the declination grid block meets the optical visibility condition, the declination grid block is searched for synchronous orbital targets using a telescope.

2. The search method according to claim 1, characterized in that: The step of dividing the set search area into search hour angle-declination grids includes: Setting the hour angle range and declination range of the search area and the field of view parameters of the telescope in the station hour angle-declination coordinate system, wherein the field of view parameters are used to characterize the field of view size of the non-overlapping part of the telescope; According to the field of view parameter, the hour angle range is divided into a plurality of hour angle strips; Each of the hour angle strips is divided into a plurality of declination grid blocks according to the field of view parameter and the declination range.

3. The search method according to claim 1, characterized in that: The interpolation process is performed on the non-continuous sequence of the hour angle declination envelope to obtain the median of the synchronous orbit target envelope curve, which includes: A cubic curve interpolation process is performed on the non-continuous sequence of the hour angle declination envelope to obtain the median of the synchronous orbit belt target envelope curve.

4. The search method according to claim 1, characterized in that: The declination grid block meets the optical visibility conditions including: The declination grid block meets the sky light and earth shadow conditions and the minimum elevation angle conditions. The sky light and earth shadow conditions indicate that the declination grid block is in the sunlight area and is not blocked by the earth. The minimum elevation angle condition indicates that the declination grid block is set above the minimum elevation angle of the telescope.

5. The search method according to claim 4, characterized in that: The declination grid block meets the optical visibility condition and further includes: The declination grid block also meets at least one of a moon avoidance condition and a Milky Way avoidance condition. The moon avoidance condition indicates that the observation angle between the moon and the declination grid block relative to the telescope is greater than the set moon avoidance angle. The Milky Way avoidance condition indicates that the galactic latitude of the declination grid block in the Milky Way coordinate system is greater than the set Milky Way avoidance angle.

6. The search method according to claim 1, characterized in that: The using a telescope to search for a synchronous orbit target in the declination grid block comprises: The declination path of the telescope is determined according to the set traversal times, and the declination path includes an increasing search path and a decreasing search path.

7. The search method according to claim 1, characterized in that: Also includes: When each of the declination grid blocks does not meet the optical visibility condition, the starting search time of the telescope is adjusted, and the optical visibility of the declination grid blocks is judged again according to the adjusted starting search time.

8. A synchronous track belt target search device, characterized in that: include: A division module, used for dividing the set search area into a search hour angle-declination grid, wherein the search hour angle-declination grid includes a plurality of hour angle strips, and each of the hour angle strips includes a plurality of declination grid blocks; A correction module is used to correct the position of the time angle strip with reference to the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area, so that each of the corrected time angle strips is located within the synchronous orbit belt target envelope curve and covers the synchronous orbit belt target dense distribution area; the correction of the position of each time angle strip with reference to the synchronous orbit belt target envelope curve and the synchronous orbit belt target dense distribution area includes: determining the median value of the synchronous orbit belt target envelope curve corresponding to each time angle strip in the station center coordinate system ; The determining of the median value of the synchronous orbit belt target envelope curve corresponding to each of the hour angle strips in the station center coordinate system includes: determining the synchronous orbit belt target envelope curve in the geocentric inertial coordinate system; obtaining the hour angle declination envelope discontinuous sequence of the median line of the synchronous orbit belt target envelope curve in the station center coordinate system through coordinate conversion; interpolating the hour angle declination envelope discontinuous sequence to obtain the median value of the synchronous orbit belt target envelope curve; determining the distribution value of the synchronous orbit belt target dense distribution area in the station center coordinate system, and the distribution value is expressed as: , wherein R represents the reference height of the synchronous orbit band target, B represents the latitude of the telescope, and H represents the elevation of the telescope; comparing the difference between the median value and the distribution value under each of the hour angle strips with the half span value of the envelope curve of the synchronous orbit band target, and correcting the declination position of the hour angle strip according to the comparison result; The judgment module is used to judge the optical visibility of each of the declination grid blocks on each of the corrected hour angle strips, and use a telescope to search for synchronous orbital targets on the declination grid blocks when the declination grid blocks meet the optical visibility conditions.

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