A multi-constellation satellite jamming link-to-ground station aggregate noise figure calculation system and method

Abstract

The application discloses a kind of multi-constellation satellite interference link to ground station collective jamming noise ratio calculation system and method, it is related to satellite communication and interference analysis technical field, including interference power calculation module, for calculating the interference power from multiple interference satellites;Interference noise ratio calculation module is used to aggregate the interference power of each interference link and calculate the ratio of interference power and noise power, output system collective jamming noise ratio;Interference power calculation module contains two sub-modules, respectively interference link spatial position analysis module, antenna gain calculation module;Interference noise ratio calculation module contains two sub-modules, respectively aggregate interference power module, noise power calculation module.The application uses above-mentioned one multi-constellation satellite interference link to ground station collective jamming noise ratio calculation system and method, provides reliable, efficient technical support for the interference management of satellite communication and navigation system.

Description

Technical Field

[0001] This invention relates to the fields of satellite communication and interference analysis technology, and in particular to a system and method for calculating the lumped interference-to-noise ratio of a multi-constellation satellite interference link to a ground station. Background Technology

[0002] With the rapid development of multi-constellation satellite systems such as low Earth orbit (LEO), medium Earth orbit (MEO), and geostationary orbit (GEO), the utilization of space spectrum resources in the field of satellite communication and navigation is becoming increasingly intensive, and the problem of interference between satellites is becoming more and more prominent. Especially in the complex space mission environment, downlinks between different constellation systems may cause multiple interferences to the same ground station, making the assessment and analysis of interference links crucial.

[0003] Currently, most traditional interference calculation methods focus on assessing interference from a single satellite to a ground station, lacking a comprehensive analysis of the lumped interference power at the receiver in multi-satellite interference environments. Existing technologies struggle to systematically handle the cumulative effects from multiple constellations and interference links, failing to provide effective integrated interference assessment solutions for satellite communications, navigation, and other fields. This results in a lack of reliable data support and technical means in practical engineering applications such as inter-constellation interference management, satellite communication optimization, and navigation system accuracy improvement.

[0004] Therefore, there is an urgent need for a system and method for calculating the lumped interference-to-noise ratio of multi-constellation satellite interference links to ground stations. This system should be able to comprehensively analyze the interference of multi-constellation satellites to working ground stations, accurately assess the impact of each interference link on the ground station, and provide an effective technical solution for interference management and system optimization in complex multi-constellation environments. Summary of the Invention

[0005] The purpose of this invention is to provide a system and method for calculating the lumped interference-to-noise ratio (INR) of ground stations in multi-constellation satellite interference links. By establishing a unified interference link model, data structure, and computational framework, core functions such as interference power calculation, antenna gain analysis, noise power assessment, and INR calculation are deeply integrated. Through precise numerical algorithms and modular design, this system can quickly and accurately analyze the interference situation of ground stations in complex multi-constellation scenarios.

[0006] To achieve the above objectives, this invention provides a system for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station, comprising: The interference power calculation module is used to calculate the interference power from multiple interference satellites; The interference-to-noise ratio calculation module is used to summarize the interference power of each interference link and calculate the ratio of interference power to noise power, and output the system lumped interference-to-noise ratio. The interference power calculation module comprises two sub-modules: an interference link spatial location analysis module and an antenna gain calculation module. The interference link spatial location analysis module is used to calculate the interference angle, the interference angle, and the propagation distance of the interference link from the interference satellite to the ground station based on the spatial relative positions of the interfering satellite, the interfered satellite, the ground station associated with the interfering satellite, and the ground station associated with the interfered satellite. The antenna gain calculation module is used to combine the interference angle, the interference angle, and the antenna type of the interfering satellite to match the corresponding antenna gain model, and calculate the transmitting antenna gain of the interfering satellite and the receiving antenna gain of the interfered ground station, respectively. The interference-to-noise ratio calculation module consists of two sub-modules: a summarizing interference power module and a noise power calculation module. The summarizing interference power module is used to accumulate and sum the interference power of each interference link acting on the ground station to obtain the total lumped interference power. The noise power calculation module is used to solve the noise power of the receiving system based on the equivalent noise temperature and communication bandwidth parameters of the ground station system.

[0007] Preferably, the interference link spatial position analysis module calculates the interference link length, interference angle, and interference angle by analyzing the spatial relationships between the interfering satellite, the interfered satellite, the ground station associated with the interfering satellite, and the interfered ground station, thereby determining the relative position of the interfering link and the ground station. The interference angle is the angle between the main axis of the corresponding transmitting beam of the interfering satellite and the direction from the interfering satellite to the interfered ground station, and the interference angle is the angle between the main axis of the receiving antenna of the interfered ground station and the direction from the interfered ground station to the interfering satellite. Among them, the interference constellation is assumed to include The first jamming satellite, Establishment of jamming satellites downlink communication link; jamming satellite, the first The first jamming satellite The position vectors of the corresponding ground station, the disrupted satellite, and the disrupted ground station for each downlink communication link are as follows: , , and ;No. Propagation distance of an interfering satellite to the affected ground station Calculate according to the following formula: ; No. The first jamming satellite Interference angle of downlink communication link Calculate according to the following formula: ; No. The angle of disturbance corresponding to each interfering satellite Calculate according to the following formula: ; in, Indicates the first The first jamming satellite The main axis direction of the transmitted beam This indicates that the interfering satellite is pointing in the direction of the disturbed ground station. Indicates the main axis direction of the receiving antenna of the disturbed ground station. Indicates the disturbed ground station is pointing to the first The direction of the interfering satellite; , .

[0008] Preferably, the antenna gain calculation module selects the antenna gain model according to the type of satellite and calculates the antenna gain of the interference link based on the obtained off-axis angle; The antenna peak gain and half of the 3dB beamwidth are determined according to the following formula: ; ; in, For antenna efficiency, The equivalent aperture of the antenna. For the operating wavelength, The beamwidth coefficient is determined by the antenna aperture shape and illumination method; The receiving antenna of the disturbed ground station uses the earth station reference pattern, the first The angle of disturbance corresponding to each interfering satellite is At that time, the receiving antenna gain is calculated according to the following formula: ; in, The peak gain of the receiving antenna of the disturbed ground station. Gain in the near-side lobe region, For the receiving antenna aperture, For receiving antenna efficiency, For the first The first jamming satellite The operating wavelength of the downlink communication link; , and The segment boundaries of the receiving radiation pattern are determined according to the following formula: ; ; when hour, ;when hour, ; When the When the interfering satellite is a geostationary orbit satellite, its first... downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ; The off-axis angle at which the gain in the GSO pattern drops to 0 dBi is determined by the following formula: ; in, For peak gain, For half a 3 dB beamwidth, The off-axis angle when the gain drops to 0 dBi. For the proximal sidelobe level, a and b are determined by... Determined; when hour, , ; When the When the interfering satellite is a non-geostationary orbit satellite, its first... downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ; ; in, and The segment boundaries of the launch pattern, The sidelobe level is the relative peak value at the junction of the main lobe and the near sidelobe. For the gain of the far sidelobe, For the first The first jamming satellite The equivalent aperture of a transmitting antenna. The efficiency of the transmitting antenna; the output of the above radiation pattern and All values ​​are expressed in dBi, and angles are expressed in degrees. Before substituting into the linear power form of the single-link interference power formula, it should be converted to linear transmit antenna gain according to the following formula. and linear receiving antenna gain : .

[0009] Preferably, the noise power calculation module calculates the equivalent noise power of the disturbed ground station receiver based on parameters such as the system's equivalent noise temperature, bandwidth, and Boltzmann constant.

[0010] Preferably, the interference-to-noise ratio calculation module calculates the lumped interference-to-noise ratio of the ground station based on the interference power of all interference links and the equivalent noise power of the receiver of the disturbed ground station.

[0011] Where all interference power is lumped in the linear power domain, the th The first jamming satellite The interference power of the downlink communication link reaching the disturbed ground station is denoted as . Let N be the equivalent noise power at the receiver of the disturbed ground station. Then the lumped interference-to-noise ratio is calculated according to the following formula: ; in, This represents the total number of interfering satellites in the interfering constellation. For the first The total number of downlink communication links established by the jamming satellites. For the first The first jamming satellite The single-link interference-to-noise ratio caused by a disturbed ground station on a downlink communication link. This represents the lumped interference noise ratio of the disturbed ground station.

[0012] A method for calculating the lumped interference-to-noise ratio (INR) of a ground station to a multi-constellation satellite interference link includes: S1. Receive the orbital parameters of the interfering satellite, the orbital parameters of the disturbed satellite, the coordinates of the ground station corresponding to the interfering satellite, and the coordinates of the disturbed ground station; S2. Based on the input orbital parameters and coordinate information, calculate the three-dimensional relative positional relationship between the jamming satellite, the jammed satellite, the ground station supporting the jamming satellite, and the jammed ground station. Solve for the jamming link propagation distance, jamming angle, and jamming angle corresponding to each jamming link. Among them, the jamming angle is the angle between the main axis direction of the corresponding transmission beam of the jamming satellite and the direction of the jamming satellite pointing to the jammed ground station, and the jamming angle is the angle between the main axis direction of the receiving antenna of the jammed ground station and the direction of the jammed ground station pointing to the jamming satellite. S3. Based on the interference angle and the disturbed angle obtained in step S2, match the corresponding satellite and ground station antenna gain models, and calculate the gain of the transmitting antenna of the interfering satellite and the receiving antenna of the disturbed ground station respectively. S4. Substitute the transmit / receive antenna gain obtained in step S3 and converted into a linear quantity, and the interference link propagation distance obtained in step S2, into the interference power calculation formula. For the j-th downlink communication link of the i-th interfering satellite, calculate the interference power reaching the disturbed ground station. ; S5. Based on the equivalent noise temperature of the ground station, communication bandwidth, and Boltzmann constant, calculate the equivalent noise power of the receiver of the disturbed ground station. S6. Using satellite index i and link index j to form a double loop, apply the results obtained in step S4 to all... The total lumped interference power of the disturbed ground station is obtained by performing a double summation in the linear power domain. S7. Calculate the ratio between the total lumped interference power obtained in step S6 and the equivalent noise power of the disturbed ground station receiver obtained in step S5, and output the lumped interference-noise ratio of the disturbed ground station.

[0013] Preferably, the following formula is used to calculate the interference power of each interference link: ; in, For the first The first jamming satellite The interference power of each downlink communication link reaching the disturbed ground station; This represents the transmit power of the link within the overlapping frequency band. For the reason The calculated linear transmit antenna gain; For the reason The converted linear receiving antenna gain; The operating wavelength; For the first The propagation distance from an interfering satellite to the affected ground station.

[0014] Therefore, the above-mentioned multi-constellation satellite interference link lumped interference-to-noise ratio calculation system and method for ground stations has the following beneficial effects: (1) By establishing a unified interference link model, data structure and calculation framework, core functions such as interference power calculation, antenna gain analysis, noise power assessment and interference-to-noise ratio calculation are deeply integrated, which can systematically and comprehensively evaluate the superimposed interference from multiple constellations (LEO, MEO, GEO) and multiple interference links, overcoming the limitation of traditional methods that can only analyze interference from a single satellite.

[0015] (2) Based on a unified satellite orbit model and antenna gain model, combined with precise spatial geometric calculations and numerical algorithms, the interference angle, the angle of disturbance, the propagation distance, and the gain of the transmitting and receiving antennas are calculated link by link. Physical parameters such as the Boltzmann constant are introduced to calculate the noise power, so that the interference power and the lumped interference-to-noise ratio (LOR) are equalized. The calculation results are more accurate and reliable.

[0016] (3) The modular architecture is adopted, and the functions such as interference link spatial location analysis, antenna gain calculation, interference power summarization and noise power calculation are modularly separated. The coupling between modules is low, which makes it easy to expand the functions or replace the model according to the actual application scenario. It has good engineering applicability and maintainability.

[0017] (4) It can provide quantitative assessment basis for inter-constellation interference management in the fields of satellite communication, satellite navigation, and space situational awareness, which helps system designers identify high-interference-risk links in advance, optimize satellite beam pointing, frequency planning and power control strategies, thereby improving the overall communication quality and navigation accuracy of the system.

[0018] (5) It is applicable to ground station interference analysis in multi-constellation satellite environments and can be widely used in satellite communication system design, frequency compatibility analysis, constellation deployment optimization and other scenarios. It has significant engineering practical value and promotion prospects.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the internal process of per-interference link loop calculation in an embodiment of the present invention. Figure 2 This is a flowchart illustrating the method for calculating the lumped interference-to-noise ratio (CINR) of a multi-constellation satellite interference link to a ground station according to an embodiment of the present invention. Figure 3 The diagram shows the radiation patterns of the earth station receiving antennas for the GSO and NGSO satellite systems according to embodiments of the present invention. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example This embodiment describes a system and method for calculating the lumped interference-to-noise ratio (LIR) of a ground station using a multi-constellation satellite jamming link. It details the calculation process for a typical multi-constellation satellite jamming link to a ground station and elaborates on how to achieve the LIR of the ground station in a complex multi-constellation environment. The specific steps of the calculation.

[0024] Please see Figures 1 to 3 This invention provides a system for calculating the lumped interference-to-noise ratio (INR) of a multi-constellation satellite interference link to a ground station. The system mainly includes an interference power calculation module and an interference-to-noise ratio (INR) calculation module. The interference power calculation module further includes an interference link spatial location analysis module and an antenna gain calculation module; the INR calculation module further includes a summarizing interference power module and a noise power calculation module.

[0025] In this embodiment, the interference power calculation module mainly consists of an interference link spatial location analysis module and an antenna gain calculation module. Internally, it has a loop structure, processing the signal of each interfering satellite link by link. The flowchart is as follows: Figure 2 As shown, the specific process is as follows: Interference link spatial location analysis module: First, the system receives orbital parameters of interfering satellites, orbital parameters of disturbed satellites, coordinates of ground stations corresponding to interfering satellites, and coordinates of disturbed ground stations from multiple constellations (such as LEO, MEO, and GEO). Based on the interference link situation, the system calculates the interference angle, the disturbance angle, and the propagation distance from the interfering satellite to the disturbed ground station for each link, based on the three-dimensional spatial relative positional relationship between the interfering satellite, the disturbed satellite, and the ground station.

[0026] Specifically, the interference link spatial location analysis module calculates the interference link length, interference angle (i.e., the off-axis angle corresponding to the transmitting antenna of the interference satellite), and interference angle (i.e., the off-axis angle corresponding to the receiving antenna of the interference satellite) by analyzing the spatial relationships between the interference satellite, the interfered satellite, the ground station associated with the interference satellite, and the interfered ground station. This determines the relative position of the interference link and the ground station. This module provides the necessary spatial and geometric information for subsequent antenna gain calculations.

[0027] Assume the interference constellation includes The first jamming satellite, Establishment of jamming satellites downlink communication link; jamming satellite, the first The first jamming satellite The position vectors of the corresponding ground station, the disrupted satellite, and the disrupted ground station for each downlink communication link are as follows: , , and ;No. Propagation distance of an interfering satellite to the affected ground station Calculate according to the following formula: ; No. The first jamming satellite Interference angle of downlink communication link Calculate according to the following formula: ; No. The angle of disturbance corresponding to each interfering satellite Calculate according to the following formula: ; in, Indicates the first The first jamming satellite The main axis direction of the transmitted beam This indicates that the interfering satellite is pointing in the direction of the disturbed ground station. Indicates the main axis direction of the receiving antenna of the disturbed ground station. Indicates the disturbed ground station is pointing to the first The direction of the interfering satellite; , .

[0028] Therefore, according to Call the first The first jamming satellite Obtaining the pattern function of the transmitted beam ,according to The function that calls the receiving antenna pattern of the disturbed ground station is used to obtain the pattern. And respectively converted to linear gain and .

[0029] The antenna gain calculation module uses the obtained link-by-link spatial location data (interference angle, disturbed angle) to select an appropriate antenna gain model for calculation based on the corresponding interfering satellite antenna type. This invention includes three typical antenna gain models: a commonly used model for GSO and NGSO satellite system earth station receiving antenna gain, a commonly used model for GSO satellite antenna gain, and a commonly used model for NGSO satellite antenna gain. The radiation patterns of the GSO and NGSO satellite system earth station receiving antennas are shown below. Figure 3 As shown.

[0030] This module calculates the antenna gain of each interference link by using the antenna gain model selected for each interference link and the interference angle and the angle of interference obtained in the previous step, thereby obtaining the antenna gain values ​​of the transmitting end (interference satellite transmitting antenna gain) and the receiving end (interference ground station receiving antenna gain) of each interference link.

[0031] The antenna peak gain and half of the 3dB beamwidth are determined according to the following formula: ; ; in, For antenna efficiency, The equivalent aperture of the antenna. For the operating wavelength, The beamwidth coefficient is determined by the antenna aperture shape and illumination method; The receiving antenna of the disturbed ground station uses the earth station reference pattern, the first The angle of disturbance corresponding to each interfering satellite is At that time, the receiving antenna gain is calculated according to the following formula: ; in, The peak gain of the receiving antenna of the disturbed ground station. Gain in the near-side lobe region, For the receiving antenna aperture, For receiving antenna efficiency, For the first The first jamming satellite The operating wavelength of the downlink communication link; , and The segment boundaries of the receiving radiation pattern are determined according to the following formula: ; ; when hour, ;when hour, ; When the When the interfering satellite is a geostationary orbit satellite, its first... downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ; The off-axis angle at which the gain in the GSO pattern drops to 0 dBi is determined by the following formula: ; in, For peak gain, For half a 3 dB beamwidth, The off-axis angle when the gain drops to 0 dBi. For the proximal sidelobe level, a and b are determined by... Determined; when hour, , ; When the When the interfering satellite is a non-geostationary orbit satellite, its first... downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ; ; in, and The segment boundaries of the launch pattern, The sidelobe level is the relative peak value at the junction of the main lobe and the near sidelobe. For the gain of the far sidelobe, For the first The first jamming satellite The equivalent aperture of a transmitting antenna. This represents the efficiency of the transmitting antenna. The above radiation pattern output... and All values ​​are expressed in dBi, and angles are expressed in degrees. Before substituting into the linear power form of the single-link interference power formula, it should be converted to linear transmit antenna gain according to the following formula. and linear receiving antenna gain : ; The radiation patterns for the aforementioned earth stations, GSO satellites, and NGSO satellites are based on ITU-R S.465-6, S.672-4, and S.1528-0, respectively. These radiation patterns are for reference only and can be replaced with actual measured radiation patterns of the antennas, manufacturer data, network-reported radiation patterns, or other applicable models; however, the replaced patterns will still adhere to the reference model. and The off-axis angle is used as input, and the dBi gain is converted into a linear gain before being used in the link calculation.

[0032] The radiation pattern of the earth station receiving antenna corresponding to the above antenna gain model is as follows: Figure 3 As shown.

[0033] Then, the interference power calculation module will combine the transmit power of the interfering satellite in the overlapping frequency band, the length of the interference link, the communication carrier wavelength of the working satellite, and the aforementioned antenna gain to calculate the interference power of a single interference link link by link, with the inner loop iterating up to j= Then it enters the next jamming satellite, and the outer loop iterates until i= This process concludes the calculation, thus completing the power calculation for all interference links.

[0034] The interference-to-noise ratio calculation module in this embodiment mainly consists of a summarizing interference power module and a noise power calculation module.

[0035] When summarizing interference power, the system accumulates and sums the interference power obtained from the previous module (interference power calculation module) for each interference link to obtain the total lumped interference power of the system. That is, the interference power of all interference links acting on the ground station is summed to obtain the total lumped interference power of the disturbed ground station.

[0036] In constellation-level interference scenarios, the system uses satellite index i and link index j to form a double loop: the outer loop traverses... The inner loop iterates through the i-th jamming satellite. There are 1 downlink communication link. The total interference power of all links is accumulated in the linear power domain, and the lumped interference-to-noise ratio is: ; When expressed in decibels, linear power summation should be performed first, followed by logarithmic transformation; the dB values ​​of each link should not be added directly.

[0037] Noise power calculation module according to Calculate the system noise power, where Boltzmann's constant, B is the equivalent noise temperature, and B is the communication bandwidth.

[0038] Finally, the interference-to-noise ratio calculation module calculates the sum of the interference power of all interfering links and the equivalent noise power at the receiver of the disturbed ground station (…). ), calculate the lumped interference noise ratio of the ground station ( The ratio is output as the final result of the system's lumped interference-to-noise ratio.

[0039] Through the coordinated operation of the aforementioned modules, this invention can accurately calculate the lumped interference-to-noise ratio (LNR) of multiple satellite interference links to ground stations in a multi-constellation environment, and provide optimized interference management solutions for satellite communication, navigation, and other fields. All modules are based on a unified satellite orbit and antenna gain model, employing precise mathematical models and numerical algorithms, enabling this invention to achieve efficient and accurate interference assessment and optimization.

[0040] This invention also provides a method for calculating the lumped interference-to-noise ratio (LIR) of a ground station to a multi-constellation satellite interference link, comprising: S1. Receive the orbital parameters of the interfering satellite, the orbital parameters of the disturbed satellite, the coordinates of the ground station corresponding to the interfering satellite, and the coordinates of the disturbed ground station; S2. Based on the input orbital parameters and coordinate information, calculate the three-dimensional relative positional relationship between the jamming satellite, the jammed satellite, the ground station supporting the jamming satellite, and the jammed ground station. Solve for the jamming link propagation distance, jamming angle, and jamming angle corresponding to each jamming link. Among them, the jamming angle is the angle between the main axis direction of the corresponding transmission beam of the jamming satellite and the direction of the jamming satellite pointing to the jammed ground station, and the jamming angle is the angle between the main axis direction of the receiving antenna of the jammed ground station and the direction of the jammed ground station pointing to the jamming satellite. S3. Based on the interference angle and the disturbed angle obtained in step S2, match the corresponding satellite and ground station antenna gain models, and calculate the gain of the transmitting antenna of the interfering satellite and the receiving antenna of the disturbed ground station respectively. S4. Substitute the transmit / receive antenna gain obtained in step S3 and converted into a linear quantity, and the interference link propagation distance obtained in step S2, into the interference power calculation formula. For the j-th downlink communication link of the i-th interfering satellite, solve for the interference power reaching the disturbed ground station. ; S5. Based on the equivalent noise temperature of the ground station, communication bandwidth, and Boltzmann constant, calculate the equivalent noise power of the receiver of the disturbed ground station. S6. Using satellite indexing and Link Index This forms a double loop, applying all the results obtained in step S4. The total lumped interference power of the disturbed ground station is obtained by performing a double summation in the linear power domain. S7. Calculate the ratio between the total lumped interference power obtained in step S6 and the equivalent noise power of the disturbed ground station receiver obtained in step S5, and output the lumped interference-noise ratio of the disturbed ground station.

[0041] The following formula is used to calculate the interference power of each interference link: ; in, For the first The first jamming satellite The interference power of each downlink communication link reaching the disturbed ground station; This represents the transmit power of the link within the overlapping frequency band. For the reason The calculated linear transmit antenna gain; For the reason The converted linear receiving antenna gain; The operating wavelength; For the first The propagation distance from an interfering satellite to the affected ground station.

[0042] Therefore, the present invention employs the aforementioned system and method for calculating the lumped interference ratio (LIR) of multiple satellite interference links to ground stations in a multi-constellation environment. This enables accurate calculation of the LIR of multiple satellite interference links to ground stations and provides optimized interference management solutions for satellite communication, navigation, and other fields. All modules are based on a unified satellite orbit and antenna gain model, employing precise mathematical models and numerical algorithms, enabling the present invention to achieve efficient and accurate interference assessment and optimization.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A system for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station, characterized in that, include: The interference power calculation module is used to calculate the interference power from multiple interference satellites; The interference-to-noise ratio calculation module is used to summarize the interference power of each interference link and calculate the ratio of interference power to noise power, and output the system lumped interference-to-noise ratio. The interference power calculation module comprises two sub-modules: an interference link spatial location analysis module and an antenna gain calculation module. The interference link spatial location analysis module is used to calculate the interference angle, the interference angle, and the propagation distance of the interference link from the interference satellite to the ground station based on the spatial relative positions of the interfering satellite, the interfered satellite, the ground station associated with the interfering satellite, and the ground station associated with the interfered satellite. The antenna gain calculation module is used to combine the interference angle, the interference angle, and the antenna type of the interfering satellite to match the corresponding antenna gain model, and calculate the transmitting antenna gain of the interfering satellite and the receiving antenna gain of the interfered ground station, respectively. The interference-to-noise ratio calculation module consists of two sub-modules: the summarizing interference power module and the noise power calculation module. The interference power aggregation module is used to sum the interference power of each interference link acting on the ground station to obtain the total lumped interference power; the noise power calculation module is used to solve the noise power of the receiving system based on the equivalent noise temperature and communication bandwidth parameters of the ground station system.

2. The system for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station according to claim 1, characterized in that: The spatial position analysis module of the interference link calculates the length of the interference link, the interference angle, and the interference angle by analyzing the spatial relationship between the interference satellite, the interfered satellite, the ground station associated with the interference satellite, and the ground station associated with the interfered satellite. This determines the relative position of the interference link and the ground station. The interference angle is the angle between the main axis of the corresponding transmit beam of the interference satellite and the direction from the interference satellite to the ground station. The interference angle is the angle between the main axis of the receiving antenna of the ground station and the direction from the ground station to the interference satellite. Among them, the interference constellation is assumed to include The first jamming satellite, Establishment of jamming satellites downlink communication link; jamming satellite, the first The first jamming satellite The position vectors of the corresponding ground station, the disrupted satellite, and the disrupted ground station for each downlink communication link are as follows: , , and ;No. Propagation distance of an interfering satellite to the affected ground station Calculate according to the following formula: ； No. The first jamming satellite Interference angle of downlink communication link Calculate according to the following formula: ； No. The angle of disturbance corresponding to each interfering satellite Calculate according to the following formula: ； in, Indicates the first The first jamming satellite The main axis direction of the transmitted beam This indicates that the interfering satellite is pointing in the direction of the disturbed ground station. Indicates the main axis direction of the receiving antenna of the disturbed ground station. Indicates the disturbed ground station is pointing to the first The direction of the interfering satellite; , .

3. The system for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station according to claim 2, characterized in that: The antenna gain calculation module selects the antenna gain model according to the type of satellite and calculates the antenna gain of the interference link based on the obtained off-axis angle. The antenna peak gain and half of the 3dB beamwidth are determined according to the following formula: ； ； in, For antenna efficiency, The equivalent aperture of the antenna. For the operating wavelength, The beamwidth coefficient is determined by the antenna aperture shape and illumination method; The receiving antenna of the disturbed ground station uses the earth station reference pattern, the first The angle of disturbance corresponding to each interfering satellite is At that time, the receiving antenna gain is calculated according to the following formula: ； in, The peak gain of the receiving antenna of the disturbed ground station. Gain in the near-side lobe region, For the receiving antenna aperture, For receiving antenna efficiency, Let be the operating wavelength of the j-th downlink communication link of the i-th jamming satellite; , and The segment boundaries of the receiving radiation pattern are determined according to the following formula: ； ； when hour, ;when hour, ; When the When the interfering satellite is a geostationary orbit satellite, its first... Downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ； The off-axis angle at which the gain in the GSO pattern drops to 0 dBi is determined by the following formula: ； in, For peak gain, For half a 3 dB beamwidth, The off-axis angle when the gain drops to 0 dBi. For the proximal sidelobe level, a and b are determined by... Determined; when hour, , ; When the When the interfering satellite is a non-geostationary orbit satellite, its first... Downlink communication link at interference angle The transmit antenna gain in the direction is calculated according to the following formula: ； ； in, and The segment boundaries of the launch pattern, The sidelobe level is the relative peak value at the junction of the main lobe and the near sidelobe. For the gain of the far sidelobe, Let be the equivalent aperture of the j-th transmitting antenna of the i-th jamming satellite. The efficiency of the transmitting antenna; the output radiation pattern. and All values ​​are expressed in dBi, and angles are expressed in degrees. Before substituting into the linear power form of the single-link interference power formula, convert them to linear transmit antenna gain according to the following formula. and linear receiving antenna gain : 。 4. The system for calculating the lumped interference-to-noise ratio of a multi-constellation satellite interference link to a ground station according to claim 3, characterized in that: The noise power calculation module calculates the noise power of the disturbed ground station receiver system based on the equivalent noise temperature, bandwidth, and Boltzmann constant.

5. The system for calculating the lumped interference-to-noise ratio of a multi-constellation satellite interference link to a ground station according to claim 4, characterized in that: The interference-to-noise ratio calculation module calculates the lumped interference-to-noise ratio of the ground station based on the interference power of all interference links and the equivalent noise power of the receiver at the disturbed ground station. The total interference power is lumped over the linear power domain, and the interference power from the i-th interfering satellite to the j-th downlink communication link reaching the affected ground station is denoted as . Let N be the equivalent noise power at the receiver of the disturbed ground station. Then the lumped interference-to-noise ratio is calculated according to the following formula: ； in, This represents the total number of interfering satellites in the interfering constellation. For the first The total number of downlink communication links established by the jamming satellites For the first The first jamming satellite The single-link interference-to-noise ratio caused by a disturbed ground station on a downlink communication link. This represents the lumped interference noise ratio of the disturbed ground station.

6. A method for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station, comprising a system for calculating the LIR of a multi-constellation satellite interference link to a ground station according to any one of claims 1-5, characterized in that... include: S1. Receive the orbital parameters of the interfering satellite, the orbital parameters of the disturbed satellite, the coordinates of the ground station corresponding to the interfering satellite, and the coordinates of the disturbed ground station; S2. Based on the input orbital parameters and coordinate information, calculate the three-dimensional relative positional relationship between the interfering satellite, the disturbed satellite, the ground station supporting the interfering satellite, and the disturbed ground station, and solve the interfering link propagation distance, interference angle, and disturbance angle corresponding to each interfering link; S3. Based on the interference angle and the disturbed angle obtained in step S2, match the corresponding satellite and ground station antenna gain models, and calculate the gain of the transmitting antenna of the interfering satellite and the receiving antenna of the disturbed ground station respectively. S4. Substitute the transmit / receive antenna gain obtained in step S3 and converted into a linear quantity, and the interference link propagation distance obtained in step S2, into the interference power calculation formula. For the j-th downlink communication link of the i-th interfering satellite, solve for the interference power reaching the disturbed ground station. ; S5. Based on the equivalent noise temperature of the ground station, communication bandwidth, and Boltzmann constant, calculate the equivalent noise power of the receiver of the disturbed ground station. S6. Using satellite index i and link index j to form a double loop, apply the results obtained in step S4 to all... The total lumped interference power of the disturbed ground station is obtained by performing a double summation in the linear power domain. S7. Calculate the ratio between the total lumped interference power obtained in step S6 and the equivalent noise power of the disturbed ground station receiver obtained in step S5, and output the lumped interference-noise ratio of the disturbed ground station.

7. The method for calculating the lumped interference-to-noise ratio (LIR) of a multi-constellation satellite interference link to a ground station according to claim 6, characterized in that, The following formula is used to calculate the interference power of each interference link: ； in, For the first The first jamming satellite The interference power of each downlink communication link reaching the disturbed ground station; This represents the transmit power of the link within the overlapping frequency band. For the reason The calculated linear transmit antenna gain; For the reason The converted linear receiving antenna gain; The operating wavelength; Let be the propagation distance from the i-th interfering satellite to the affected ground station.

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