Relay link on-off state prediction method and device, equipment and storage medium

Abstract

The invention provides a relay link on-off state prediction method, apparatus and device, and a storage medium. The method comprises the steps of obtaining direction information of a satellite-ground link, position information of each observation point in the direction of the satellite-ground link, and rainfall information of each observation point in a future target time period; the satellite-ground link is a link between the ground station and the relay satellite; determining the rain attenuation rate and the rainfall height of each observation point according to the rainfall information; according to the rainfall height, the position information of each observation point and the direction information of the satellite-ground link, judging whether the satellite-ground link in the observation range of each observation point passes through a rainfall area or not; determining the total rainfall attenuation of the satellite-ground link according to the rain penetration judgment result of each observation point and the rainfall attenuation rate; and determining the on-off state of the relay link based on the total rainfall attenuation. According to the invention, the accuracy of judging the on-off state of the relay link is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite communication, and in particular, to a method, device, equipment and storage medium for predicting the on / off state of a relay link. Background Art

[0002] The relay satellite system is the main force for manned spaceflight TT&C communication. The space-ground link signal of the relay satellite is in the Ka band, and rainfall will cause attenuation of the Ka band signal level, resulting in the interruption of the relay link. Since manned spaceflight missions have high reliability requirements, it is necessary to predict the rainfall attenuation of the space-ground signal of the relay satellite within a specific time period, so as to know in advance whether the relay link will be interrupted.

[0003] The existing solution is the method provided by the ITU (International Telecommunication Union) standard. The rainfall attenuation predicted by the ITU method is calculated based on the time distribution of rainfall intensity, and there is a large error from the actual rainfall attenuation during a certain rainfall period. Therefore, the predicted value of rainfall attenuation obtained is not accurate enough, which in turn reduces the accuracy of the judgment on whether the relay link is interrupted. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a method, device, equipment and storage medium for predicting the on / off state of a relay link, so as to improve the accuracy of the judgment on whether the relay link is interrupted.

[0005] In a first aspect, a method for predicting the on / off state of a relay link is provided, and the method includes:

[0006] Obtain the direction information of the space-ground link in the relay link, the position information of each observation point in the direction of the space-ground link, and the rainfall information of each observation point in the future target time period; wherein, the relay link includes a space-ground link and an inter-satellite link, the space-ground link is the link between the ground station and the relay satellite, and the inter-satellite link is the link between the relay satellite and the user satellite;

[0007] Determine the rain attenuation rate and rainfall height of each observation point according to the rainfall information;

[0008] Judge whether the space-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point and the direction information of the space-ground link;

[0009] Determine the total rainfall attenuation of the space-ground link according to the rain penetration judgment result and the rain attenuation rate of each observation point;

[0010] Determine the on / off state of the relay link based on the total rainfall attenuation.

[0011] Optionally, obtaining the rainfall information of each observation point in the future target time period includes:

[0012] Determine the rainfall information of each observation point in the future target time period through various data sources such as satellite observations, ground observation stations, and weather forecasts.

[0013] Optionally, determining the rain attenuation rate of each observation point according to the rainfall information includes:

[0014] Obtain the predicted rainfall intensity of each observation point in the future target time period and the signal frequency on the satellite-ground link;

[0015] Determine the first rainfall constant related to the signal frequency;

[0016] Determine the rain attenuation rate of each observation point according to the first rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows:

[0017]

[0018] where i is the serial number of the observation point, γ i is the rain attenuation rate at the observation point i, a and b are both constants related to the signal frequency, and Ri is the predicted rainfall intensity at the observation point i.

[0019] Optionally, determining the rainfall height of each observation point according to the rainfall information includes:

[0020] Obtain the rainfall type and predicted rainfall intensity of each observation point in the future target time period;

[0021] Determine the second rainfall constant related to the rainfall type;

[0022] Determine the rainfall height of each observation point according to the second rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows:

[0023]

[0024] where i is the serial number of the observation point, H i is the rainfall height at the observation point i, a' and b' are both constants related to the rainfall type, and Ri is the predicted rainfall intensity at the observation point i.

[0025] Optionally, determining whether the satellite-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the satellite-ground link includes:

[0026] Determine the height of the satellite-ground link at each observation point according to the position information of each observation point and the direction information of the satellite-ground link;

[0027] Determine whether it passes through the rainfall area according to the magnitude of the rainfall height of each observation point relative to the height of the satellite-ground link at each observation point and the preset rain penetration model;

[0028] The preset rain penetration model is as follows:

[0029]

[0030] Wherein, i is the serial number of the observation point, X i represents the horizontal straight-line distance of the observation point i relative to the ground station, θ is the elevation angle of the direction between the ground station and the relay satellite; X i tgθ represents the height of the highest point of the space-ground link corresponding to the observation range of each observation point. When f is equal to 1, it means passing through the rainfall area, and the space-ground link will be affected by rainfall. When f is equal to 0, it means not passing through the rainfall area, and the space-ground link will not be affected by rainfall.

[0031] Optionally, determining the total rainfall attenuation of the space-ground link according to the rain penetration judgment results and rain attenuation rates of each observation point includes:

[0032] Determining the space-ground link intervals observed by each observation point according to the space-ground link direction information and the position information of each observation point;

[0033] Determining the local rainfall attenuation within each space-ground link interval according to the rain penetration judgment results and rain attenuation rates of each observation point;

[0034] Determining the total rainfall attenuation of the space-ground link according to each local rainfall attenuation through the following formula; the calculation formula is as follows:

[0035]

[0036] Wherein,

[0037] X1 = 0; X0 = 0;

[0038] A is the total rainfall attenuation, i is the serial number of the observation point, N is the number of observation points, f(H i ,X i ,θ) is the preset rain penetration model, γ i is the rain attenuation rate at the observation point i, θ is the elevation angle of the direction between the ground station and the relay satellite, X i is the horizontal straight-line distance of the observation point i from the ground station, ΔX i / cosθ is the space-ground link interval observed by the observation point i.

[0039] Optionally, determining the on-off state of the relay link based on the total rainfall attenuation includes:

[0040] Correcting the initial carrier-to-noise ratio of the space-ground link based on the rainfall attenuation;

[0041] Calculating the total carrier-to-noise ratio on the relay link based on the corrected carrier-to-noise ratio of the space-ground link and the carrier-to-noise ratio on the inter-satellite link;

[0042] Compare the total carrier-to-noise ratio with a preset demodulation threshold;

[0043] If the total carrier-to-noise ratio is less than the preset demodulation threshold, determine that the on / off state of the relay link is interrupted; otherwise, determine that the on / off state of the relay link is to maintain the connection.

[0044] In a second aspect, a device for predicting the on / off state of a relay link is provided. The device includes:

[0045] An acquisition unit for acquiring the direction information of the space-ground link in the relay link, the position information of each observation point in the direction of the space-ground link, and the rainfall information of each observation point in a future target time period; wherein, the relay link includes a space-ground link and an inter-satellite link, the space-ground link is the link between the ground station and the relay satellite, and the inter-satellite link is the link between the relay satellite and the user satellite;

[0046] A first determination unit for determining the rain attenuation rate and rainfall height of each observation point according to the rainfall information;

[0047] A judgment unit for judging whether the space-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the space-ground link;

[0048] A second determination unit for determining the total rainfall attenuation of the space-ground link according to the rain-through judgment result and rain attenuation rate of each observation point;

[0049] A third determination unit for determining the on / off state of the relay link based on the total rainfall attenuation.

[0050] In a third aspect, an electronic device is provided, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0051] The memory is used for storing a computer program;

[0052] The processor, when executing the program stored on the memory, implements the method steps described in any one of the first aspect.

[0053] In a fourth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the method steps described in any one of the first aspect.

[0054] A method, apparatus, device, and storage medium for predicting the on / off state of a relay link provided by an embodiment of the present invention obtain the direction information of the satellite-ground link in the relay link, the position information of each observation point in the direction of the satellite-ground link, and the rainfall information of each observation point in a future target time period; determine the rain attenuation rate and rainfall height of each observation point according to the rainfall information; judge whether the satellite-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the satellite-ground link; determine the total rainfall attenuation of the satellite-ground link according to the rain-through judgment result and the rain attenuation rate of each observation point; and determine the on / off state of the relay link based on the total rainfall attenuation. By obtaining the rainfall information each time to predict the rainfall height and rainfall attenuation, the present invention can more accurately predict the rainfall attenuation during a certain rainfall compared with the ITU method, thereby improving the accuracy of judging the on / off state of the relay link.

[0055] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0057] Figure 1 Shows the flowchart of the method for predicting the on / off state of the relay link provided by the embodiment of the present invention;

[0058] Figure 2 Shows the structural schematic diagram of a device for predicting the on / off state of a relay link provided by the embodiment of the present invention;

[0059] Figure 3 Shows the structural schematic diagram of an electronic device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0061] Considering that the probability values of rainfall attenuation at a specific time predicted by the current ITU method often deviate from the actual rainfall attenuation, and the obtained predicted values are often inaccurate, thereby reducing the accuracy of judging whether the space-ground link is interrupted. Based on this, the embodiments of the present invention provide a method and device for predicting the on-off state of a space-ground link, which will be described below through embodiments.

[0062] The embodiments of the present invention provide a method for predicting the on-off state of a space-ground link, as Figure 1 shown, the method includes the following steps:

[0063] Step S101: Obtain the direction information of the space-ground link, the position information of each observation point on the direction of the space-ground link, and the rainfall information of each observation point in the future target time period; wherein, the space-ground link is a link between a ground station and a relay satellite.

[0064] In the embodiments of the present application, a series of observation points are distributed on the direction path from the ground station to the satellite. The ground station is located at the starting point of the space-ground path, usually defined as the position where X1 = 0 km, that is, the first position in the observation point sequence. The observation points are distributed in sequence along the direction from the ground station to the relay satellite. The observation points can be evenly distributed or unevenly distributed. Their positions depend on the area that actually needs to be monitored. For example, in some areas, more dense observation points may be required to capture local rainfall changes. Each observation point has a horizontal straight-line distance relative to the ground station. This horizontal straight-line distance is the position information of each observation point.

[0065] Step S102: Determine the rain attenuation rate and rainfall height of each observation point according to the rainfall information.

[0066] In the embodiments of the present application, the rain attenuation rate refers to the degree of signal strength attenuation caused by the presence of raindrops. Generally speaking, the higher the signal frequency, the greater the rain attenuation rate; the greater the rainfall, the greater the rain attenuation rate; the longer the distance of signal transmission and the larger the rain area passed through, the more obvious the attenuation.

[0067] Rainfall height refers to the height of the top of the rain cloud from the ground, which directly affects the degree of attenuation during signal transmission. Different types of rainfall, such as convective rain and frontal rain, have corresponding rainfall heights of different types. The greater the rainfall intensity, the higher the rainfall height, and thus the longer the calculated rainfall path, and the greater the corresponding rainfall attenuation.

[0068] The ITU method calculates the rainfall attenuation on the path from the ground station to the relay satellite based on rainfall intensity, the elevation angle of the ground station to the relay satellite, and the average cloud base height in the region. Because the ITU method uses the average cloud base height in the region, this value is feasible for annual analysis, but it is not accurate enough for analysis during a particular rainfall period. Since the average cloud base height in the region used by the ITU is significantly lower than the actual cloud base height during a particular rainfall period, the rainfall attenuation prediction value is too small.

[0069] Therefore, the embodiment of the present application determines the rainfall height corresponding to each rainfall according to the rainfall information predicted during each rainfall period at each observation point, thereby greatly improving the prediction accuracy of rainfall attenuation, and further improving the accuracy of judging the on / off status of the relay link.

[0070] Step S103: judging whether the satellite-to-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point and the direction information of the satellite-to-ground link.

[0071] If the satellite-to-ground link does not pass through a rainy area, it will not be affected by rain. If it passes through a rainy area, it will be affected by rain.

[0072] Step S104: Determine the total rainfall attenuation of the satellite-to-ground link according to the rain penetration judgment result and rain attenuation rate of each observation point.

[0073] Step S105: determining the on / off state of the satellite-to-ground link based on the total rainfall attenuation.

[0074] The greater the total rainfall attenuation, the greater the possibility of satellite-to-ground link interruption. How to determine the on / off state of the satellite-to-ground link according to the total rainfall attenuation will be described in detail in the following embodiments and will not be repeated here.

[0075] Through the above embodiments, it can be understood that the embodiments of the present invention utilize the positive correlation between rainfall intensity and rainfall height in rainfall information to obtain rainfall information for each time to determine rainfall height and rainfall attenuation. Compared with the ITU method, the rainfall attenuation during a rainfall period can be more accurately predicted, thereby improving the accuracy of judging the on / off status of the satellite-to-ground link.

[0076] Based on the above embodiment, obtaining rainfall information of each observation point in the future target time period includes:

[0077] Determine the rainfall information of each observation point in the future target time period through multiple data sources such as satellite observations, ground observation stations, and weather forecasts.

[0078] In the embodiment of the present invention, by combining multiple data sources to obtain rainfall information, the accuracy of rainfall prediction is greatly improved.

[0079] Based on the above embodiment, determining the rain attenuation rate of each observation point according to the rainfall information includes:

[0080] Obtain the predicted rainfall intensity of each observation point in the future target time period and the signal frequency on the satellite-ground link.

[0081] Determine the first rainfall constant related to the signal frequency.

[0082] This first rainfall constant can be obtained by querying relevant literature.

[0083] According to the first rainfall constant and the predicted rainfall intensity, determine the rain attenuation rate of each observation point through the following formula. The calculation formula is as follows:

[0084]

[0085] Where, i is the serial number of the observation point, γ i is the rain attenuation rate at the observation point i, a and b are both constants related to the signal frequency, obtained by looking up the table, and Ri is the predicted rainfall intensity at the observation point i.

[0086] Regarding the first rainfall constants a and b, for example, they can be obtained by querying the article "The aRb Relation in the Calculation of Rain Attenuation" (R.L. Olsen, D.V. Rogers, D.B. Hodge, IEEE Transaction on Anntenas and Propagation, Vol. 26, No. 2, 1978.3.). For the rainfall in the temperate continental climate, the recommended raindrop size distribution is the Laws and Parsons (LP) distribution, and the rain temperature is 0 degrees Celsius. When the satellite-ground link signal is a downlink signal of 20 GHz, a = 0.0626 and b = 1.119; when the satellite-ground link signal is an uplink signal of 30 GHz, a = 0.162 and b = 1.061.

[0087] Based on the above embodiment, determining the rainfall height of each observation point according to the rainfall information includes:

[0088] Obtain the rainfall type and the predicted rainfall intensity of each observation point in the future target time period.

[0089] Among them, rainfall types include, for example, convective rain, frontal rainfall, and cyclonic rainfall.

[0090] Determine the second rainfall constant related to the rainfall type. It can be obtained by referring to relevant papers.

[0091] According to the second rainfall constant and the predicted rainfall intensity, determine the rainfall height at each observation point through the following formula. The calculation formula is as follows:

[0092]

[0093] Among them, i is the serial number of the observation point, and H i is the rainfall height at the observation point i, a' and b' are both constants related to the rainfall type, and Ri is the predicted rainfall intensity at the observation point i.

[0094] In an example, by referring to the paper "Analysis of Asian Rain Top and Cloud Top Heights Detected by Spaceborne Rain Radar and Cloud Profiling Radar" (Cao Aiqin, Master's Thesis of the University of Science and Technology of China, May 2010), it can be obtained that a' = 4.0 and b' = 0.22.

[0095] Based on the above embodiments, determining whether the space-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the space-ground link includes:

[0096] Determine the height of the space-ground link at each observation point according to the position information of each observation point and the direction information of the space-ground link.

[0097] Determine whether it passes through the rainfall area according to the magnitude of the rainfall height at each observation point relative to the height of the space-ground link at each observation point and the preset rain penetration model.

[0098] The preset rain penetration model is as follows:

[0099]

[0100] Among them, i is the serial number of the observation point, and X i represents the horizontal straight-line distance of the observation point i relative to the ground station, θ is the elevation angle of the direction between the ground station and the relay satellite; X i tgθ represents the height of the highest point of the space-ground link corresponding to the observation range of each observation point. When f is equal to 1, it means that the space-ground link is below the rain top, passes through the rainfall area, and the space-ground link will be affected by rainfall. When f is equal to 0, it means that the space-ground link is above the rain top, does not pass through the rainfall area, and the space-ground link will not be affected by rainfall.

[0101] Based on the above embodiments, determining the total rainfall attenuation of the space-ground link according to the rain penetration judgment result of each observation point and the rain attenuation rate includes:

[0102] Determine the space - to - ground link intervals observed at each observation point according to the space - to - ground link direction information and the position information of each observation point.

[0103] Determine the local rainfall attenuation within each space - to - ground link interval according to the rain - penetration judgment results and the rainfall attenuation rate at each observation point.

[0104] Determine the total rainfall attenuation of the space - to - ground link based on each local rainfall attenuation through the following formula; the calculation formula is as follows:

[0105]

[0106] Where,

[0107] X1 = 0; X0 = 0;

[0108] A is the total rainfall attenuation, i is the serial number of the observation point, N is the number of observation points, f(H i ,X i ,θ) is a preset rain - penetration model, γ i is the rainfall attenuation rate at the observation point i, θ is the elevation angle of the direction between the ground station and the relay satellite, X i is the horizontal straight - line distance from the observation point i to the ground station, ΔX i / cosθ is the space - to - ground link interval observed at the observation point i.

[0109] Based on the above - mentioned embodiments, determining the on - off state of the relay link based on the total rainfall attenuation includes the following steps:

[0110] Step S1051: Correct the initial carrier - to - noise ratio of the space - to - ground link based on the rainfall attenuation.

[0111] The initial carrier - to - noise ratio refers to the carrier - to - noise ratio of the space - to - ground link without rainfall. The carrier - to - noise ratio refers to the ratio of the power of the effective signal, i.e., the carrier, to the noise power density in a communication system. The higher the carrier - to - noise ratio, the clearer the signal and the better the reliability of data transmission.

[0112] In one example, correct the initial carrier - to - noise ratio of the space - to - ground link through the following formula:

[0113]

[0114] Where, C represents the carrier power, N0 represents the noise power density; is the decibel value of the initial carrier - to - noise ratio on the space - to - ground link between the ground station and the relay satellite, A represents the total rainfall attenuation, represents the decibel value of the carrier - to - noise ratio of the space - to - ground link with rainfall after correction.

[0115] Step S1052: Calculate the total carrier - to - noise ratio on the relay link based on the corrected carrier - to - noise ratio of the space - to - ground link and the carrier - to - noise ratio of the inter - satellite link.

[0116] In one example, the total carrier-to-noise ratio can be calculated by the following formula:

[0117]

[0118] where represents the original value of the carrier-to-noise ratio of the space-to-ground link during rainfall after correction. The decibel value of the carrier-to-noise ratio can be converted to the original value according to the following conversion formula:

[0119]

[0120] represents the original value of the carrier-to-noise ratio on the link between the relay satellite and the user satellite;

[0121] represents the original value of the total carrier-to-noise ratio on the relay link between the ground station and the user satellite.

[0122] Step S1053: Compare the total carrier-to-noise ratio with a preset demodulation threshold.

[0123] In the embodiments of the present application, the demodulation threshold refers to the lowest carrier-to-noise ratio that can ensure correct decoding of the signal during demodulation. When the carrier-to-noise ratio of the received signal is lower than this threshold, the demodulator may not be able to correctly recover the original information from the received signal, resulting in a sharp increase in the bit error rate.

[0124] Step S1054: If the total carrier-to-noise ratio is less than the preset demodulation threshold, determine that the on-off state of the relay link is interrupted; otherwise, determine that the on-off state of the relay link is maintained.

[0125] Based on the same inventive concept, a device for predicting the on-off state of a relay link is provided, as Figure 2 shown. The device includes:

[0126] An acquisition unit 201, configured to acquire the direction information of the space-to-ground link in the relay link, the position information of each observation point in the direction of the space-to-ground link, and the rainfall information of each observation point in a future target time period; wherein, the relay link includes a space-to-ground link and an inter-satellite link, the space-to-ground link is the link between the ground station and the relay satellite, and the inter-satellite link is the link between the relay satellite and the user satellite;

[0127] A first determination unit 202, configured to determine the rain attenuation rate and rainfall height of each observation point according to the rainfall information;

[0128] A judgment unit 203, configured to judge whether the space-to-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the space-to-ground link;

[0129] The second determination unit 204 is configured to determine the total rainfall attenuation of the satellite-ground link according to the rain penetration determination results and the rain attenuation rate of each observation point;

[0130] The third determination unit 205 is configured to determine the on / off state of the relay link based on the total rainfall attenuation.

[0131] Optionally, the acquisition unit specifically determines the rainfall information of each observation point in the future target time period through multiple data sources such as satellite observations, ground observation stations, and weather forecasts.

[0132] Optionally, the first determination unit is specifically configured to:

[0133] Obtain the predicted rainfall intensity of each observation point in the future target time period and the signal frequency on the satellite-ground link;

[0134] Determine the first rainfall constant related to the signal frequency;

[0135] Determine the rain attenuation rate of each observation point according to the first rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows:

[0136]

[0137] where i is the serial number of the observation point, γ i is the rain attenuation rate at the observation point i, a and b are both constants related to the signal frequency, obtained by looking up the table, and Ri is the predicted rainfall intensity at the observation point i.

[0138] Optionally, the first determination unit is specifically configured to:

[0139] Obtain the rainfall type and the predicted rainfall intensity of each observation point in the future target time period;

[0140] Determine the second rainfall constant related to the rainfall type;

[0141] Determine the rainfall height of each observation point according to the second rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows:

[0142]

[0143] where i is the serial number of the observation point, H i is the rainfall height at the observation point i, a' and b' are both constants related to the rainfall type, obtained by looking up the table, and Ri is the predicted rainfall intensity at the observation point i.

[0144] Optionally, the judgment unit is specifically configured to:

[0145] Determine the height of the satellite-ground link at each observation point according to the position information of each observation point and the direction information of the satellite-ground link;

[0146] Determine whether to pass through the rainfall area according to the magnitude of the rainfall height at each observation point relative to the height of the space-ground link at each observation point and a preset rain penetration model;

[0147] The preset rain penetration model is as follows:

[0148]

[0149] where i is the serial number of the observation point, and X i represents the horizontal straight-line distance of the observation point i relative to the ground station, θ is the elevation angle of the direction between the ground station and the relay satellite; X i tgθ represents the height of the highest point of the space-ground link corresponding to the observation range of each observation point. When f is equal to 1, it means passing through the rainfall area and the space-ground link will be affected by rainfall. When f is equal to 0, it means not passing through the rainfall area and the space-ground link will not be affected by rainfall.

[0150] Optionally, the second determination unit is specifically used to include:

[0151] Determine the space-ground link intervals observed at each observation point according to the space-ground link direction information and the position information of each observation point;

[0152] Determine the local rainfall attenuation within each space-ground link interval according to the rain penetration judgment results and the rain attenuation rate at each observation point;

[0153] Determine the total rainfall attenuation of the space-ground link through the following formula according to each local rainfall attenuation; the calculation formula is as follows:

[0154]

[0155] where,

[0156] X1 = 0; X0 = 0;

[0157] A is the total rainfall attenuation, i is the serial number of the observation point, N is the number of observation points, f(H i ,X i ,θ) is the preset rain penetration model, γ i is the rain attenuation rate at the observation point i, θ is the elevation angle of the direction between the ground station and the relay satellite, X i is the horizontal straight-line distance of the observation point i from the ground station, and ΔX i / cosθ is the space-ground link interval observed at the observation point i.

[0158] Optionally, the third determination unit is specifically used to:

[0159] Correct the initial carrier-to-noise ratio of the space-ground link based on the rainfall attenuation;

[0160] Calculate the total carrier-to-noise ratio of the relay link based on the corrected carrier-to-noise ratio of the space-ground link and the carrier-to-noise ratio of the inter-satellite link;

[0161] Compare the total carrier-to-noise ratio with a preset demodulation threshold;

[0162] If the total carrier-to-noise ratio is less than the preset demodulation threshold, determine that the on / off state of the relay link is interrupted; otherwise, determine that the on / off state of the relay link is maintaining the connection.

[0163] Through the above embodiments, it can be understood that the embodiments of the present invention use the positive correlation between the rainfall intensity and the rainfall height in the rainfall information to obtain the rainfall information each time to determine the rainfall height and rainfall attenuation. Compared with the ITU method, it can more accurately predict the rainfall attenuation during a certain rainfall, thereby improving the accuracy of judging the on / off state of the relay link.

[0164] Based on the same technical concept, the embodiments of the present invention also provide an electronic device, as Figure 3 shown, including a processor 301, a communication interface 302, a memory 303, and a communication bus 304. Among them, the processor 301, the communication interface 302, and the memory 303 complete mutual communication through the communication bus 304.

[0165] The memory 303 is used to store a computer program;

[0166] The processor 301 is used to implement the steps of the relay link on / off state prediction method when executing the program stored on the memory 303.

[0167] The communication bus mentioned in the above electronic device may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, only a thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0168] The communication interface is used for communication between the above electronic device and other devices.

[0169] The memory may include a Random Access Memory (RAM), and may also include a Non-Volatile Memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located far from the aforementioned processor.

[0170] The above-mentioned processor may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0171] The computer program product for the method of predicting the on / off state of a relay link provided by an embodiment of the present invention includes a computer-readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the method described in the foregoing method embodiments. For the specific implementation, reference can be made to the method embodiments, which will not be elaborated herein.

[0172] The relay link on / off state prediction device provided by an embodiment of the present invention may be specific hardware on a device, or software or firmware installed on the device, etc. The implementation principle and the technical effects produced by the device provided by an embodiment of the present invention are the same as those of the foregoing method embodiments. For a brief description, for the parts not mentioned in the device embodiments, reference can be made to the corresponding content in the foregoing method embodiments. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can all refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated herein.

[0173] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some communication interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0174] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0175] In addition, each functional unit in the embodiments provided by the present invention may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

[0176] If the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, may be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0177] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0178] Finally, it should be noted that: the above-mentioned embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for predicting the on / off state of a relay link, characterized in that The method includes: Obtaining the direction information of the space - to - ground link in the relay link, the position information of each observation point in the direction of the space - to - ground link, and the rainfall information of each observation point in the future target time period; wherein, the relay link includes a space - to - ground link and an inter - satellite link, the space - to - ground link is the link between the ground station and the relay satellite, and the inter - satellite link is the link between the relay satellite and the user satellite; Determining the rain attenuation rate and rainfall height of each observation point according to the rainfall information; Judging whether the space - to - ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the space - to - ground link; Determining the total rainfall attenuation of the space - to - ground link according to the rain - passing judgment results and rain attenuation rates of each observation point; Determining the on - off state of the relay link based on the total rainfall attenuation.

2. The method according to claim 1, wherein Obtaining the rainfall information of each observation point in the future target time period includes: Determining the rainfall information of each observation point in the future target time period through multiple data sources such as satellite observation, ground observation stations, and weather forecasts.

3. The method according to claim 1, characterized in that, Determining the rain attenuation rate of each observation point according to the rainfall information includes: Obtaining the predicted rainfall intensity of each observation point in the future target time period and the signal frequency on the space - to - ground link; Determining a first rainfall constant related to the signal frequency; Determining the rain attenuation rate of each observation point according to the first rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows: where \(i\) is the observation point serial number, and \(\gamma\) i is the rain attenuation rate at the observation point \(i\), both \(a\) and \(b\) are constants related to the signal frequency, and \(R_i\) is the predicted rainfall intensity at the observation point \(i\).

4. The method according to claim 1, wherein Determining the rainfall height of each observation point according to the rainfall information includes: Obtaining the rainfall type and predicted rainfall intensity of each observation point in the future target time period; Determining a second rainfall constant related to the rainfall type; Determining the rainfall height of each observation point according to the second rainfall constant and the predicted rainfall intensity through the following formula, and the calculation formula is as follows: where i is the serial number of the observation point, and H i is the rainfall height at the observation point i, a' and b' are both constants related to the rainfall type, and Ri is the predicted rainfall intensity at the observation point i.

5. The method according to claim 1, characterized in that, The step of judging whether the space - to - ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the space - to - ground link includes: Determining the height of the space - to - ground link at each observation point according to the position information of each observation point and the direction information of the space - to - ground link; Determining whether it passes through the rainfall area according to the magnitude of the rainfall height of each observation point relative to the height of the space - to - ground link at each observation point and a preset rain - passing model; The preset rain - passing model is as follows: where i is the serial number of the observation point, and X i represents the horizontal straight-line distance of the observation point i relative to the ground station, and θ is the elevation angle of the direction between the ground station and the relay satellite; X i tgθ represents the height of the highest point of the space-ground link corresponding to the observation range of each observation point. When f equals 1, it means passing through the rainfall area, and the space-ground link will be affected by rainfall. When f equals 0, it means not passing through the rainfall area, and the space-ground link will not be affected by rainfall.

6. The method according to claim 1, wherein The step of determining the total rainfall attenuation of the space - to - ground link according to the rain - passing judgment results and rain attenuation rates of each observation point includes: Determining the space - to - ground link intervals observed by each observation point according to the direction information of the space - to - ground link and the position information of each observation point; Determining the local rainfall attenuation within each space - to - ground link interval according to the rain - passing judgment results and rain attenuation rates of each observation point; Determining the total rainfall attenuation of the space - to - ground link according to each local rainfall attenuation through the following formula; the calculation formula is as follows: Among them, X1 = 0; X0 = 0; A is the total rainfall attenuation, i is the serial number of the observation point, N is the number of observation points, f(H i , X i , θ) is the preset rain penetration model, γ i is the rain attenuation rate at the observation point i, θ is the elevation angle between the ground station and the direction of the relay satellite, X i is the horizontal straight-line distance from the observation point i to the ground station, ΔX i / cosθ is the space-ground link interval observed at the observation point i.

7. The method according to claim 1, wherein The step of determining the on - off state of the relay link based on the total rainfall attenuation includes: Correcting the initial carrier - to - noise ratio of the space - to - ground link based on the rainfall attenuation; Calculating the total carrier - to - noise ratio on the relay link based on the corrected carrier - to - noise ratio of the space - to - ground link and the carrier - to - noise ratio on the inter - satellite link; Comparing the total carrier - to - noise ratio with a preset demodulation threshold; If the total carrier-to-noise ratio is less than the preset demodulation threshold, determine that the on / off state of the relay link is interrupted; otherwise, determine that the on / off state of the relay link is to maintain the connection.

8. A relay link on / off state prediction device, characterized in that The device includes: An acquisition unit, configured to acquire the direction information of the satellite-ground link in the relay link, the position information of each observation point in the direction of the satellite-ground link, and the rainfall information of each observation point in a future target time period; wherein, the relay link includes a satellite-ground link and an inter-satellite link, the satellite-ground link is the link between the ground station and the relay satellite, and the inter-satellite link is the link between the relay satellite and the user satellite; A first determination unit, configured to determine the rain attenuation rate and rainfall height of each observation point according to the rainfall information; A judgment unit, configured to judge whether the satellite-ground link within the observation range of each observation point passes through the rainfall area according to the rainfall height, the position information of each observation point, and the direction information of the satellite-ground link; A second determination unit, configured to determine the total rainfall attenuation of the satellite-ground link according to the rain-through judgment result and rain attenuation rate of each observation point; A third determination unit, configured to determine the on / off state of the relay link based on the total rainfall attenuation; 9. An electronic device, characterized in that, Including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus; The memory is used for storing a computer program; The processor is configured to implement the method steps described in any one of claims 1-7 when executing the program stored on the memory.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the method steps described in any one of claims 1-7 are implemented.

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