CN113691332B - Co-channel interference characterization method and device of low-earth-orbit satellite communication system - Google Patents

Co-channel interference characterization method and device of low-earth-orbit satellite communication system Download PDF

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CN113691332B
CN113691332B CN202111062461.8A CN202111062461A CN113691332B CN 113691332 B CN113691332 B CN 113691332B CN 202111062461 A CN202111062461 A CN 202111062461A CN 113691332 B CN113691332 B CN 113691332B
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CN113691332A (en
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张海君
彭欢
刘向南
邱宇
隆克平
盛敏
黄颖
李伟
米振强
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University of Science and Technology Beijing USTB
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    • H04B17/345—Interference values
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
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Abstract

The invention discloses a same frequency interference representation method and a device of a low earth orbit satellite communication system, wherein the method comprises the following steps: constructing a low-orbit satellite communication system model; the low-earth satellite communication system model comprises a plurality of satellites and a plurality of ground terminals, wherein the satellites are divided into a plurality of layers according to the orbital altitude; establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element; determining satellites which may cause co-channel interference to the target terminal based on the space-time position model matrix and the position information of the target terminal to obtain a satellite set which may cause interference to the target terminal; calculating the access capacity of the target terminal; and simultaneously, the co-frequency interference of the terminal uplink in the satellite coverage area to the satellite is researched, the definition of an interference factor is given to represent the co-frequency interference of the terminal uplink in the coverage area, and the average capacity of the satellite is calculated. The invention can provide guiding significance for technical researches such as constellation interference avoidance, system frequency rule and constellation design.

Description

Co-channel interference characterization method and device of low-earth-orbit satellite communication system
Technical Field
The invention relates to the technical field of satellite communication, in particular to a same frequency interference characterization method and device of a low-earth-orbit satellite communication system.
Background
With the rapid development of science and technology, 5G communication technology and internet technology are rapidly developed, and the scale of the traditional stationary orbit communication market is smaller and smaller. At present, most of global communication satellites mainly use GEO satellites as main components, geosynchronous geostationary satellites can only work in a crowded environment due to limited orbital resources, the orbital height is high, the data transmission delay is large, so that the geosynchronous geostationary satellites are difficult to adapt to the requirements of modern service transmission, the low-orbit satellites can greatly reduce the delay, the delay within 50ms is realized, and the delay is equivalent to a ground optical fiber network, so that the development of a low-orbit satellite communication system becomes a great development trend of the current satellite communication.
On the one hand, the low-earth-orbit satellite has short transmission delay. The path loss is small, the number of satellites is large, the coverage range is wide, the formed constellation can realize real global coverage, and the frequency reuse is more effective; on the other hand, cellular communication, multiple access, spot beam, frequency reuse, etc. also provide technical support for low-orbit satellite mobile communication, so that there are many scholars, and researchers consider that the low-orbit satellite communication system is an important component for establishing future 6G communication, and have already started to perform research and experiments in this respect. At present, in the research aiming at more than ten thousand giant constellation systems, a always smart interference analysis method is not provided, and the change rule of the space-time distribution of interference under the strong time-varying dynamic state of a low-orbit satellite and the constellation scale can be well represented.
Disclosure of Invention
The invention provides a method and a device for representing co-channel interference of a low-orbit satellite communication system, which aim to solve the technical problem that the prior art cannot well represent the co-channel interference in the low-orbit satellite communication system.
In order to solve the technical problems, the invention provides the following technical scheme:
in one aspect, the present invention provides a co-channel interference characterization method for a low earth orbit satellite communication system, including:
constructing a low-orbit satellite communication system model; the low-earth satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbital altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
determining satellites which are likely to form co-frequency interference on the target terminal based on the space-time position model matrix and the position information of the target terminal to obtain a satellite set which is likely to form interference on the target terminal;
determining the interference suffered by a target terminal based on the satellite set, and calculating the access capacity of the target terminal; and simultaneously, co-frequency interference of the target terminal uplink in the satellite coverage area to the satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the target terminal uplink in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated.
Further, the establishing of the spatio-temporal position model matrix of each layer of satellite includes:
constructing a layered formation matrix model by taking the serial number information of a single satellite as an element; the number information comprises a layer number of a layer where the satellite is located, a track number in the current layer and a position number in the current track;
and performing position modeling on each satellite based on the layered formation matrix model, and converting the position modeling into the position information of a single satellite in a Cartesian coordinate system under the earth center to obtain a space-time position model matrix of each layer of satellite.
Further, determining a satellite which may cause co-channel interference to the target terminal based on the spatio-temporal location model matrix and the location information of the target terminal, and obtaining a set of satellites which may cause interference to the target terminal, including:
calculating the distance between the target terminal and each other satellite on the layer where the target satellite is located based on the space-time position model matrix corresponding to the layer where the target satellite is located and the position information of the target terminal;
when the distance between the satellite positioned on the same layer as the target satellite and the target terminal is smaller than a first threshold value, determining that the current satellite is a satellite which is likely to generate co-channel interference on the target terminal, and obtaining a first satellite set which is positioned on the same layer as the target satellite and is likely to generate interference on the target terminal;
calculating the distance between the target terminal and each satellite in other layers based on a space-time position model matrix corresponding to the other layers without the target satellite and the position information of the target terminal;
and when the distance between the satellite of the other layer and the target terminal is smaller than a second threshold value, determining that the current satellite is a satellite which is likely to form co-channel interference on the target terminal, and obtaining a second satellite set which is likely to form interference on the target terminal in the other layer.
Further, based on the satellite set, determining the interference suffered by a target terminal, and calculating the access capacity of the target terminal; meanwhile, co-frequency interference of an uplink of a target terminal in a satellite coverage area to a satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the uplink of the target terminal in a low-orbit satellite coverage area, and the average capacity of the satellite is calculated, wherein the method comprises the following steps:
calculating the channel gain of a satellite-to-ground link, and integrating and solving the interference of each satellite in the first satellite set on the target terminal based on the channel gain to obtain the same-frequency interference in a single-layer system;
integrating and solving the interference of each satellite in the second satellite set on the target terminal, and calculating the same frequency interference in an interlayer system;
determining average interference based on co-channel interference in a single-layer system and co-channel interference in an interlayer system to obtain the access capacity of the target terminal;
the definition of the interference factor is given to represent the co-channel interference of the low-orbit satellite communication system, and the average capacity of a single satellite is calculated.
Further, the first threshold value
Figure BDA0003256875880000031
Is as shown inThe following:
Figure BDA0003256875880000032
wherein h isiIs the orbital altitude, R, of the ith layer satelliteeWhich is the radius of the earth, is,
Figure BDA0003256875880000033
the minimum elevation angle is covered for the satellite.
Further, the target terminal q and the ith layer numbered m n satellite
Figure BDA0003256875880000034
Channel gain of
Figure BDA0003256875880000035
The expression of (a) is as follows:
Figure BDA0003256875880000036
wherein G istFor satellite transmission gain, GrIn order for the terminal to receive the gain,
Figure BDA0003256875880000037
for the channel attenuation index to be determined by the frequency,
Figure BDA0003256875880000038
representing said target terminal q to the i-th layer numbered m n satellite
Figure BDA0003256875880000039
The euclidean distance of (c).
Further, co-channel interference in the single-layer system
Figure BDA00032568758800000310
The expression of (a) is as follows:
Figure BDA00032568758800000311
wherein eta isDLFor co-frequency probability parameters, p, associated with frequency reuse strategiestIs the transmission power of the satellite signal and,
Figure BDA00032568758800000312
indicating a communication satellite at layer i numbered m n,
Figure BDA00032568758800000313
indicating a set of satellites in the low-earth layer i satellites that may interfere with the target terminal q.
Further, co-channel interference in the inter-layer system
Figure BDA00032568758800000314
The expression of (a) is as follows:
Figure BDA00032568758800000315
wherein the content of the first and second substances,
Figure BDA00032568758800000316
representing a target terminal q to a satellite
Figure BDA00032568758800000317
The channel gain of (a) is determined,
Figure BDA00032568758800000318
representing a communication satellite numbered m n at layer j,
Figure BDA00032568758800000319
indicating a set of satellites in the low earth orbit layer j satellites that may interfere with the target terminal q,
Figure BDA00032568758800000320
representing said target terminal q to a satellite of layer j number m n
Figure BDA00032568758800000321
The euclidean distance of (c).
The target terminal q access capacity
Figure BDA00032568758800000322
The expression of (a) is as follows:
Figure BDA0003256875880000041
wherein, B is the channel bandwidth, N is the noise power of the satellite-ground link, and j is the number of satellite layers with interlayer interference.
Further, the interference factor is defined as follows:
Figure BDA0003256875880000042
target satellite
Figure BDA0003256875880000043
Average uplink interference of terminal q in coverage area
Figure BDA0003256875880000044
The expression of (a) is as follows:
Figure BDA0003256875880000045
wherein eta isULThe same-frequency probability factor related to the system frequency reuse strategy is represented by λ, which is the Poisson point distribution density (unit is number/m) obeyed by the terminal2)，Pt' transmitting a signal frequency, G, for a terminalt' for terminal antenna transmission gain, Gr' as satellite reception gain, CaIs the footprint of the satellite.
Uplink based average capacity of layer i satellites
Figure BDA0003256875880000046
Figure BDA0003256875880000047
Wherein, CasIs the satellite footprint area and B is the channel bandwidth.
On the other hand, the invention also provides a co-channel interference characterization device of the low-orbit satellite communication system, which comprises the following steps:
the communication system model building module is used for building a low-orbit satellite communication system model; the low-earth satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbital altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
the space-time position model matrix construction module is used for establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
an interference satellite set building module, configured to determine, based on the spatio-temporal location model matrix built by the spatio-temporal location model matrix building module and location information of a target terminal, a satellite that may cause co-channel interference with the target terminal, and obtain a satellite set that may cause interference with the target terminal;
the interference characterization module is used for determining the interference suffered by the target terminal based on the satellite set constructed by the interference satellite set construction module and calculating the access capacity of the target terminal; and simultaneously, co-frequency interference of the target terminal uplink in the satellite coverage area to the satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the target terminal uplink in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated.
In yet another aspect, the present invention also provides an electronic device comprising a processor and a memory; wherein the memory has stored therein at least one instruction that is loaded and executed by the processor to implement the above-described method.
In yet another aspect, the present invention also provides a computer-readable storage medium having at least one instruction stored therein, the instruction being loaded and executed by a processor to implement the above method.
The technical scheme provided by the invention has the beneficial effects that at least:
the invention provides a proper modeling mode for analyzing the space-time characteristics of the interference between complex systems of the low-orbit communication system. According to the invention, a giant-constellation low-orbit system is layered according to the orbit height, then the orbit numbers of satellites on the same layer are layered according to the orbit, finally the satellites on the same orbit are numbered, and the position modeling of the satellites is completed through the conversion of a double coordinate system, wherein ground terminals are distributed on Poisson points in the same order in the earth surface. The invention simultaneously and respectively represents the satellite-ground link interference expressions in a single-layer system and among multi-layer systems under the dense giant constellation, analyzes the relationship between the interference and the system scale, the antenna inclination angle and the like, and gives the average access capacity of the system on the basis of the interference in the system and among the systems, and can realize the flexible description and analysis of the time-space correlation of the complex interference of the system under the condition of strong time-varying dynamics of the network structure under the complex system of massive low-orbit satellites; therefore, guiding significance is provided for various technical researches of improving system capacity, such as constellation interference avoidance, system frequency rule, constellation design and the like.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating an implementation of a co-channel interference characterization method for a low-earth orbit satellite communication system according to a first embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating an implementation of a co-channel interference characterization method for a low earth orbit satellite communication system according to a second embodiment of the present invention;
fig. 3 is a schematic view of an application scenario of a co-channel interference characterization method for a low-earth orbit satellite communication system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First embodiment
The embodiment provides a co-channel interference characterization method of a low-earth-orbit satellite communication system, which can be realized by electronic equipment. The execution flow of the method is shown in fig. 1, and comprises the following steps:
s1, constructing a low-orbit satellite communication system model; the low-earth satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbital altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
s2, establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
s3, determining satellites which may cause co-channel interference to the target terminal based on the space-time position model matrix and the position information of the target terminal to obtain a satellite set which may cause interference to the target terminal;
s4, determining the interference suffered by the target terminal based on the satellite set, and calculating the access capacity of the target terminal; and simultaneously, co-frequency interference of the terminal uplink in the satellite coverage area to the satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the terminal uplink in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated.
Further, the establishing of the spatio-temporal position model matrix of each layer of satellite includes:
constructing a layered formation matrix model by taking the serial number information of a single satellite as an element; the number information comprises a layer number of a layer where the satellite is located, a track number in the current layer and a position number in the current track;
and performing position modeling on each satellite based on the layered formation matrix model, and converting the position modeling into the position information of a single satellite in a Cartesian coordinate system under the earth center to obtain a space-time position model matrix of each layer of satellite.
Further, determining a satellite which may cause co-channel interference to the target terminal based on the spatio-temporal position model matrix and the position information of the target terminal, and obtaining a satellite set which may cause interference to the target terminal, including:
calculating the distance between the target terminal and each other satellite of the layer where the target satellite is located based on the space-time position model matrix corresponding to the layer where the target satellite is located and the position information of the target terminal;
when the distance between the satellite positioned on the same layer as the target satellite and the target terminal is smaller than a first threshold value, determining that the current satellite is a satellite which is likely to generate co-channel interference on the target terminal, and obtaining a first satellite set which is positioned on the same layer as the target satellite and is likely to generate interference on the target terminal;
calculating the distance between the target terminal and each satellite in other layers based on a space-time position model matrix corresponding to the other layers without the target satellite and the position information of the target terminal;
and when the distance between the satellite of the other layer and the target terminal is smaller than a second threshold value, determining that the current satellite is a satellite which is likely to form co-channel interference on the target terminal, and obtaining a second satellite set which is likely to form interference on the target terminal in the other layer.
Based on a satellite set, calculating the access capacity of the target terminal, determining the interference suffered by the target terminal and giving out the definition of an interference factor to characterize the co-channel interference of a low-orbit satellite communication system, wherein the method comprises the following steps:
calculating the channel gain of a satellite-to-ground link, and integrating and solving the interference of each satellite in the first satellite set on the target terminal based on the channel gain to obtain the same-frequency interference in a single-layer system;
integrating and solving the interference of each satellite in the second satellite set on the target terminal, and calculating the same frequency interference in an interlayer system; obtaining the access capacity of the target terminal;
determining average interference based on co-channel interference in a single-layer system and co-channel interference in an interlayer system;
the definition of the interference factor is given to characterize the co-channel interference of the low-orbit satellite communication system.
Further, the first threshold value
Figure BDA0003256875880000071
The expression of (a) is as follows:
Figure BDA0003256875880000072
wherein h isiIs the orbital altitude, R, of the ith layer satelliteeWhich is the radius of the earth, is,
Figure BDA0003256875880000073
the minimum elevation angle is covered for the satellite.
Further, the target terminal q and the ith satellite numbered m n
Figure BDA0003256875880000074
Channel gain of
Figure BDA0003256875880000075
The expression of (a) is as follows:
Figure BDA0003256875880000076
wherein G istFor satellite transmission gain, GrIn order for the terminal to receive the gain,
Figure BDA0003256875880000077
for the channel attenuation index to be determined by the frequency,
Figure BDA0003256875880000078
representing said target terminal q to the i-th layer numbered m n satellite
Figure BDA0003256875880000079
The euclidean distance of (c).
Further, co-channel interference in the single-layer system
Figure BDA00032568758800000710
The expression of (a) is as follows:
Figure BDA00032568758800000711
wherein eta isDLCo-frequency probability factor, p, associated with a system frequency reuse strategytIs the transmission power of the satellite signal and,
Figure BDA00032568758800000712
indicating a communication satellite at layer i numbered m n,
Figure BDA00032568758800000713
indicating a set of satellites in the low-earth layer i satellites that may interfere with the target terminal q.
Further, co-channel interference in the inter-layer system
Figure BDA00032568758800000714
The expression of (a) is as follows:
Figure BDA00032568758800000715
wherein the content of the first and second substances,
Figure BDA00032568758800000716
representing a target terminal q to a satellite
Figure BDA00032568758800000717
The channel gain of (a) is determined,
Figure BDA00032568758800000718
representing a communication satellite numbered m n at layer j,
Figure BDA00032568758800000719
indicating a set of satellites in the low-earth layer j satellites that may interfere with the target terminal q,
Figure BDA00032568758800000720
representing said target terminal q to a satellite of layer j number m n
Figure BDA00032568758800000721
The euclidean distance of (c).
The target terminal q access capacity
Figure BDA00032568758800000722
The expression of (c) is as follows:
Figure BDA0003256875880000081
wherein, B is the channel bandwidth, N is the noise power of the satellite-to-ground link, and j is the number of satellite layers with interlayer interference.
Further, the interference factor is defined as follows:
Figure BDA0003256875880000082
target satellite
Figure BDA0003256875880000083
Average uplink interference of terminals q in a coverage area
Figure BDA0003256875880000084
The expression of (a) is as follows:
Figure BDA0003256875880000085
wherein eta isULLambda is the distribution density of Poisson points obeyed by the terminal (unit: number/m) for the co-frequency probability parameter related to the frequency reuse strategy2)，Pt' transmitting a signal frequency, G, for a terminalt' for terminal antenna transmission gain, Gr' as satellite reception gain, CaIs the footprint of the satellite.
Uplink based average capacity of layer i satellites
Figure BDA0003256875880000086
Figure BDA0003256875880000087
Wherein, CasIs the satellite footprint area and B is the channel bandwidth.
In summary, this embodiment provides an interference characterization method under a constellation formation model for interference study of a future ten-thousand-star low-orbit satellite system, and provides a relationship between interference factors and system interference co-system parameters for representing complex interference analysis of a giant constellation system, so as to reveal a space-time evolution mechanism of giant constellation interference, thereby providing technical guidance for a subsequent interference-related study direction of a giant constellation.
Second embodiment
The embodiment provides a co-channel interference characterization method of a low-orbit satellite communication system, and aims to provide a mapping mechanism of complex interference space-time characteristics in the system aiming at the future development of a large-scale complex low-orbit satellite system. The method may be implemented by an electronic device. The execution flow of the method is shown in fig. 2, and comprises the following steps:
step 1: based on Walker constellation configuration as research object, hierarchical formation initialization matrix model of whole giant constellation system is constructed
Figure BDA0003256875880000088
Specifically, in the present embodiment, tens of thousands of low earth orbit satellites and terrestrial end users are considered. As shown in fig. 2, a multi-layer low earth satellite system leo _ i is also included, with a plurality of terminals on the ground, Q being a set of ground terminals, taking into account the satellite-to-ground communication link between the ground terminals and the low earth satellite.
Numbering the complex ten-thousand-satellite S system, under the condition of no loss of generality, the satellite at the same orbit height is a same-layer system, and the orbit elevation angles in the same-layer system are kept consistent, so that the complex system is arranged according to the orbit height hiThe satellite orbit planning method comprises the steps of carrying out layering from high to low (leo _1, …, leo _ i, leo _ i +1 and …), and dividing the orbit number N according to the respective orbit planes of the satellite in the layersiNumber of orbits NiNumber (1,2 … N …, N)i) Generally, the number of satellites per orbit in each same layer is MiSame, for each orbit satellite MiPerforming M according to the corresponding position relationiNumber (1,2 … M … M)i) Thus, each layer is initialized to form a formation model in one-to-one correspondence
Figure BDA0003256875880000091
Figure BDA0003256875880000092
Step 2: after the formation model is completed, the space-time position of a single star is modeled according to the transformation of a double coordinate system (an angle coordinate system and an earth center coordinate system)
Figure BDA0003256875880000093
Modeling, establishing space-time position model matrix of each layer of constellation
Figure BDA0003256875880000094
Wherein the track period of the lower track layer leo _ i is Ti，
Figure BDA0003256875880000095
In the formula, ReIs the radius of the earth, G is the gravitational constant; in the angular coordinate system of the space satellite, the orbital inclination angle is thetai，Ωm nIs the right ascension point of the right ascension point,
Figure BDA0003256875880000096
the included angle between the initialized position under the orbit plane and the ascending node under the angle coordinate system is numbered in Walker constellation (1,2 … M … M)i) Respectively correspond to each other in sequence
Figure BDA0003256875880000097
The initial angle of (a) of (b),
Figure BDA0003256875880000098
the included angle between the running direction of the running time t of the satellite and the rising node is a single satellite
Figure BDA0003256875880000099
Has a coordinate of (omega) in the angular coordinate systemi,ωm n,θi)。
And converted into the single-star position of the Cartesian coordinate system under the center of the earth
Figure BDA00032568758800000910
Comprises the following steps:
Figure BDA00032568758800000911
thereby obtaining a space-time position model matrix W of all satellites under each layer systemleo_i
Figure BDA00032568758800000912
And step 3: the ground terminal Q is set to have a density of lambda UTs/km2The homogeneous Poisson point distribution phi is that the frequency factor under the system frequency reuse strategy is K, the frequency occurrence probability is the same, and the position of any known terminal q is wqMinimum elevation threshold for constellation to ground coverage
Figure BDA0003256875880000101
Computing terminal q and communication satellite
Figure BDA0003256875880000102
Is a distance of
Figure BDA0003256875880000103
In the embodiment, in order to research the interference problem of the satellite-ground link, a research object (comprising a target terminal q and a target satellite) is given
Figure BDA0003256875880000104
) Knowing the position of the terminal q as wq＝(xq,yq,zq)TIn this case, the spatio-temporal position model matrix W of the low-orbit layer where the target satellite is locatedleo_iSearching the position information of the target satellite, calculating the Euclidean distance between the position information and the target satellite in three-dimensional space, and obtaining the terminal q and the communication satellite
Figure BDA0003256875880000105
Is a distance of
Figure BDA0003256875880000106
Comprises the following steps:
Figure BDA0003256875880000107
and 4, step 4: the space-time position matrix W of the satellite leo _ i is obtained from step 2leo_iAnd known position information w of the terminal qqCalculating the space-time distance matrix of the satellite and the terminal q on the layer
Figure BDA0003256875880000108
Since the condition for the presence of adjacent satellite interference in a satellite system is related to the distance between the adjacent satellite and the terminal (described later), the real-time position relationship matrix of the terminal to all satellites in the leo _ i layer, i.e. D, is calculatedleo_iComprises the following steps:
Figure BDA0003256875880000109
and 5: according to the position w of the terminalqSatellite for telecommunication
Figure BDA00032568758800001010
Calculating the upper threshold of the distance between the satellite which possibly forms co-channel interference to the terminal q and the terminal q in the same layer at the low orbit layer i
Figure BDA00032568758800001011
Same-layer adjacent satellite interference condition: terminal q is in satellite
Figure BDA00032568758800001012
The coverage range (the sight distance LOS propagation range of the ground terminal of the satellite and the requirement of the satellite for covering the minimum elevation angle) is converted into a mathematical position relation, and the distance between the sight distance LOS propagation range and the minimum elevation angle of the satellite is smaller than the minimum elevation angle covered by the satellite
Figure BDA00032568758800001013
Threshold value determined jointly with track height h:
Figure BDA00032568758800001014
step 6, the space-time distance matrix D in the step 4 is processedleo_iEach element in (1) and the threshold value obtained in step (5)
Figure BDA00032568758800001015
Comparing (adjacent satellites in the threshold value range may form co-channel interference to the target satellite and the target terminal link) to obtain a satellite set which may form interference to the terminal q in the same layer
Figure BDA00032568758800001016
And 7: root of herbaceous plantGain G according to satellite transmissiontTerminal reception gain GrTransmission power p of sum signaltObtaining the channel gain of the satellite-ground link
Figure BDA00032568758800001017
(large scale fading);
after the interference source set is known, calculating link channel gain (in a low-earth orbit satellite network, the distance between a terminal and a satellite is long enough, the influence of the motion of an LEO satellite on the distance can be ignored in a short time, meanwhile, the propagation delay of a satellite-earth link is long, and channel state information is often outdated, so that the influence of large-scale fading on the change of signal strength is large, and only the problem of large-scale fading is generally considered):
Figure BDA00032568758800001018
wherein G istFor satellite transmission gain, GrIn order for the terminal to receive the gain,
Figure BDA00032568758800001119
for frequency dependent channel attenuation index
And 8: the terminal q obtained from the step 6 and the step 7 suffers from the same frequency interference in the single-layer system
Figure BDA0003256875880000111
Obtaining the same frequency interference in the single-layer system by integrating and solving the interference sources
Figure BDA0003256875880000112
Is composed of
Figure BDA0003256875880000113
Wherein eta isDLFor co-frequency probability parameters, p, associated with frequency reuse strategiestIs the transmit power of the satellite signal.
So far, the analysis of the same frequency interference from the terminal to the target satellite by the adjacent satellite in the layer is obtained.
The analysis method for the targeted inter-layer (which may be the inter-giant constellation system layer or other systems) is similar to the intra-layer interference analysis. The method comprises the following specific steps:
and step 9: and repeating the step 4 for the interlayer interference of different low-orbit satellite layers j: obtaining a space-time distance matrix of the layer of satellites and the terminal q
Figure BDA0003256875880000114
And (5) repeating the step: calculating the distance upper threshold between the satellite possibly forming co-channel interference to the terminal q in the leo _ j layer and the terminal q
Figure BDA0003256875880000115
And repeating the step 6 to obtain leo _ j layers of satellite sets possibly forming interference on the terminal q
Figure BDA0003256875880000116
Repeating the step 8, and calculating the same frequency interference of the terminal q in the interlayer system
Figure BDA0003256875880000117
Get the terminal q to
Figure BDA0003256875880000118
Access capacity of
Figure BDA0003256875880000119
Wherein, the computing terminal q is subjected to the same frequency interference in the interlayer system
Figure BDA00032568758800001110
Is composed of
Figure BDA00032568758800001111
After knowing the signal-to-interference ratio according to the Shannon formula, the terminal q reaches
Figure BDA00032568758800001112
Access capacity of
Figure BDA00032568758800001113
Comprises the following steps:
Figure BDA00032568758800001114
step 10: the definition of an interference factor phi is given, and the target satellite is deduced
Figure BDA00032568758800001115
Average uplink interference of terminal q in coverage area
Figure BDA00032568758800001116
The expression (2) represents the co-channel interference of the uplink of the low-orbit satellite coverage area terminal, and calculates the average capacity of the satellite.
Aiming at the scene that the ground terminal meets Poisson point distribution, the user terminal can access the number x of the terminalsUTsSatisfy the requirement of
Figure BDA00032568758800001117
After analysis of the mathematical model within the satellite coverage, the coverage area of a single satellite:
Figure BDA00032568758800001118
given the definition of the interference factor:
Figure BDA0003256875880000121
influenced by parameters of the orbit height, then the target satellite
Figure BDA0003256875880000122
Average uplink interference of terminal q in coverage area
Figure BDA0003256875880000123
Figure BDA0003256875880000124
Wherein eta isULThe same-frequency probability factor related to the system frequency reuse strategy, lambda is the distribution density of Poisson points obeyed by the terminal (unit is: number/m)2)，Pt' transmitting signal frequency, G, for a terminalt' for terminal antenna transmission gain, Gr' as satellite reception gain, CaIs the footprint of the satellite (a) according to Campbell's theorem.
From which the average capacity of the uplink-based layer i satellite is derived
Figure BDA0003256875880000125
Figure BDA0003256875880000126
Wherein, CasIs the satellite footprint area and B is the channel bandwidth.
To sum up, the same-frequency interference characterization method of the low-orbit satellite communication system of the embodiment performs layering and layering according to the orbit height on the giant-constellation low-orbit system, then codes the orbit number of the same-layer satellite according to the orbit, then codes the same-orbit satellite, completes the position modeling of the satellite through the conversion of a double coordinate system, and the ground user analyzes the same-frequency interference in the satellite-ground link on the basis of the homogeneous poisson point distribution in the earth surface, characterizes the interference in the same-layer system, and analyzes the space-time relationship between the same-satellite scale and the deployment distribution; representing the internal interference of the interlayer system aiming at different layer systems, and giving the time-space relationship among the same orbit height, the satellite scale and the deployment distribution of the system; then, the interference factors of the giant constellation are used for depicting the intra-layer leading satellite interference and the inter-layer satellite interference, and finally, the capacity prediction of the access capacity is given. The method realizes the complex interference analysis of the giant constellation system, reveals the space-time evolution mechanism of the giant constellation interference, and can provide technical guidance for the relevant research direction of the giant constellation subsequent interference
Third embodiment
The embodiment provides a co-channel interference characterization device of a low earth orbit satellite communication system, which comprises:
the communication system model building module is used for building a low-orbit satellite communication system model; the low-orbit satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbit altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
the space-time position model matrix construction module is used for establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
an interference satellite set building module, configured to determine, based on the spatio-temporal location model matrix built by the spatio-temporal location model matrix building module and location information of a target terminal, a satellite that may cause co-channel interference with the target terminal, and obtain a satellite set that may cause interference with the target terminal;
the interference characterization module is used for determining the interference suffered by the target terminal based on the satellite set constructed by the interference satellite set construction module and calculating the access capacity of the target terminal; and simultaneously, co-frequency interference of the target terminal uplink in the satellite coverage area to the satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the target terminal uplink in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated.
The co-channel interference characterization device of the low-orbit satellite communication system of the embodiment corresponds to the co-channel interference characterization method of the low-orbit satellite communication system of the embodiment; the functions realized by the functional modules in the co-channel interference characterization device of the low-orbit satellite communication system of the embodiment correspond to the flow steps in the co-channel interference characterization method of the low-orbit satellite communication system of the embodiment one by one; therefore, it is not described herein.
Fourth embodiment
The present embodiment provides an electronic device, which includes a processor and a memory; wherein the memory has stored therein at least one instruction that is loaded and executed by the processor to implement the method of the first embodiment.
The electronic device may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) and one or more memories, where at least one instruction is stored in the memory, and the instruction is loaded by the processor and executes the method.
Fifth embodiment
The present embodiment provides a computer-readable storage medium, in which at least one instruction is stored, and the instruction is loaded and executed by a processor to implement the method of the first embodiment. The computer readable storage medium may be, among others, ROM, random access memory, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. The instructions stored therein may be loaded by a processor in the terminal and perform the above-described method.
Furthermore, it should be noted that the present invention may be provided as a method, apparatus or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied in the medium.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
Finally, it should be noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, once the basic inventive concepts have been learned, numerous changes and modifications may be made without departing from the principles of the invention, which shall be deemed to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present invention.

Claims (3)

1. A method for characterizing co-channel interference of a low earth orbit satellite communication system, comprising:
constructing a low-orbit satellite communication system model; the low-earth satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbital altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
determining satellites which are likely to form co-frequency interference on the target terminal based on the space-time position model matrix and the position information of the target terminal to obtain a satellite set which is likely to form interference on the target terminal;
determining the interference suffered by a target terminal based on the satellite set, and calculating the access capacity of the target terminal; simultaneously, co-frequency interference of an uplink of a target terminal in a satellite coverage area to a satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the uplink of the target terminal in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated;
determining satellites which may cause co-channel interference to the target terminal based on the spatio-temporal position model matrix and the position information of the target terminal to obtain a set of satellites which may cause interference to the target terminal, including:
calculating the distance between the target terminal and each other satellite on the layer where the target satellite is located based on the space-time position model matrix corresponding to the layer where the target satellite is located and the position information of the target terminal;
when the distance between the satellite positioned on the same layer as the target satellite and the target terminal is smaller than a first threshold value, determining that the current satellite is a satellite which is likely to generate co-channel interference on the target terminal, and obtaining a first satellite set which is positioned on the same layer as the target satellite and is likely to generate interference on the target terminal;
calculating the distance between the target terminal and each satellite in other layers based on a space-time position model matrix corresponding to the other layers without the target satellite and the position information of the target terminal;
when the distance between the satellites on the other layers and the target terminal is smaller than a second threshold value, determining that the current satellite is a satellite which is likely to form co-channel interference on the target terminal, and obtaining a second satellite set which is likely to form interference on the target terminal in the other layers;
determining the interference suffered by a target terminal based on the satellite set, and calculating the access capacity of the target terminal; meanwhile, co-frequency interference of an uplink of a target terminal in a satellite coverage area to a satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the uplink of the target terminal in a low-orbit satellite coverage area, and the average capacity of the satellite is calculated, wherein the method comprises the following steps:
calculating the channel gain of a satellite-to-ground link, and integrating and solving the interference of each satellite in the first satellite set on the target terminal based on the channel gain to obtain the same-frequency interference in a single-layer system;
integrating and solving the interference of each satellite in the second satellite set on the target terminal, and calculating the same frequency interference in an interlayer system;
determining average interference based on co-channel interference in a single-layer system and co-channel interference in an interlayer system to obtain the access capacity of the target terminal;
giving out the definition of interference factors to represent the same frequency interference of a low orbit satellite communication system and calculating the average capacity of a single satellite;
the first threshold value
Figure FDA0003597175690000021
The expression of (a) is as follows:
Figure FDA0003597175690000022
wherein h isiIs the orbital altitude, R, of the ith layer satelliteeThe radius of the earth, theta is the minimum elevation angle of satellite coverage;
the target terminal q and the satellite with the i-th layer number of m n
Figure FDA0003597175690000023
Channel gain of
Figure FDA0003597175690000024
The expression of (a) is as follows:
Figure FDA0003597175690000025
wherein G istFor satellite transmission gain, GrIn order for the terminal to receive the gain,
Figure FDA0003597175690000026
for the channel attenuation index to be determined by the frequency,
Figure FDA0003597175690000027
representing said target terminal q to the i-th layer numbered m n satellite
Figure FDA0003597175690000028
The Euclidean distance of (c);
co-channel interference within the single layer system
Figure FDA0003597175690000029
The expression of (a) is as follows:
Figure FDA00035971756900000210
wherein eta isDLFor co-frequency probability parameters, p, associated with frequency reuse strategiestIs the transmission power of the satellite signal and,
Figure FDA00035971756900000211
indicating a communication satellite at layer i numbered m n,
Figure FDA00035971756900000212
representing a satellite set which possibly forms interference to a target terminal q in low-orbit ith layer satellites;
co-channel interference within the inter-layer system
Figure FDA00035971756900000213
The expression of (a) is as follows:
Figure FDA00035971756900000214
wherein the content of the first and second substances,
Figure FDA00035971756900000215
representing a target terminal q to a satellite
Figure FDA00035971756900000216
The channel gain of (a) is determined,
Figure FDA00035971756900000217
representing a communication satellite numbered m n at layer j,
Figure FDA00035971756900000218
indicating a set of satellites in the low earth orbit layer j satellites that may interfere with the target terminal q,
Figure FDA00035971756900000219
representing said target terminal q to a satellite of layer j number m n
Figure FDA00035971756900000220
The Euclidean distance of (c);
the target terminal q access capacity
Figure FDA00035971756900000221
The expression of (c) is as follows:
Figure FDA00035971756900000222
b is a channel bandwidth, N is a noise power of a satellite-ground link, and j is the number of satellite layers with interlayer interference;
the interference factor is defined as follows:
Figure FDA0003597175690000031
target satellite
Figure FDA0003597175690000032
Average uplink interference of terminal q in coverage area
Figure FDA0003597175690000033
The expression of (a) is as follows:
Figure FDA0003597175690000034
wherein eta isULThe same-frequency probability factor related to the system frequency reuse strategy, lambda is the distribution density of Poisson points obeyed by the terminal, Pt' transmitting signal frequency, G, for a terminalt' for terminal antenna transmission gain, Gr' as satellite reception gain, CaIs the footprint of the satellite;
uplink based average capacity of layer i satellites
Figure FDA0003597175690000035
Figure FDA0003597175690000036
Wherein, CasIs the satellite footprint area and B is the channel bandwidth.
2. The method according to claim 1, wherein the establishing the spatio-temporal position model matrix of each layer of satellites comprises:
constructing a layered formation matrix model by taking the serial number information of a single satellite as an element; the number information comprises a layer number of a layer where the satellite is located, a track number in the current layer and a position number in the current track;
and performing position modeling on each satellite based on the layered formation matrix model, and converting the position modeling into the position information of a single satellite in a Cartesian coordinate system under the earth center to obtain a space-time position model matrix of each layer of satellite.
3. An apparatus for characterizing co-channel interference in a low earth orbit satellite communication system, comprising:
the communication system model building module is used for building a low-orbit satellite communication system model; the low-orbit satellite communication system model comprises a plurality of satellites and a plurality of ground terminals which are communicated with the satellites, wherein the satellites are divided into a plurality of layers according to the orbit altitude, and each layer comprises a plurality of satellites; the plurality of ground terminals conform to homogeneous poisson point distribution;
the space-time position model matrix construction module is used for establishing a space-time position model matrix of each layer of satellite by taking the position information of a single satellite as a matrix element;
an interference satellite set building module, configured to determine, based on the spatio-temporal location model matrix built by the spatio-temporal location model matrix building module and location information of a target terminal, a satellite that may cause co-channel interference with the target terminal, and obtain a satellite set that may cause interference with the target terminal;
the interference characterization module is used for determining the interference suffered by the target terminal based on the satellite set constructed by the interference satellite set construction module and calculating the access capacity of the target terminal; simultaneously, co-frequency interference of an uplink of a target terminal in a satellite coverage area to a satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the uplink of the target terminal in the low-orbit satellite coverage area, and the average capacity of the satellite is calculated;
determining satellites which may cause co-channel interference to the target terminal based on the spatio-temporal position model matrix and the position information of the target terminal to obtain a set of satellites which may cause interference to the target terminal, including:
calculating the distance between the target terminal and each other satellite on the layer where the target satellite is located based on the space-time position model matrix corresponding to the layer where the target satellite is located and the position information of the target terminal;
when the distance between the satellite positioned on the same layer as the target satellite and the target terminal is smaller than a first threshold value, determining that the current satellite is a satellite which is likely to generate co-channel interference on the target terminal, and obtaining a first satellite set which is positioned on the same layer as the target satellite and is likely to generate interference on the target terminal;
calculating the distance between the target terminal and each satellite in other layers based on a space-time position model matrix corresponding to the other layers without the target satellite and the position information of the target terminal;
when the distance between the satellites on the other layers and the target terminal is smaller than a second threshold value, determining that the current satellite is a satellite which is likely to form co-channel interference on the target terminal, and obtaining a second satellite set which is likely to form interference on the target terminal in the other layers;
determining the interference suffered by a target terminal based on the satellite set, and calculating the access capacity of the target terminal; meanwhile, co-frequency interference of an uplink of a target terminal in a satellite coverage area to a satellite is determined, the definition of an interference factor is given to represent the co-frequency interference of the uplink of the target terminal in a low-orbit satellite coverage area, and the average capacity of the satellite is calculated, wherein the method comprises the following steps:
calculating the channel gain of a satellite-to-ground link, and integrating and solving the interference of each satellite in the first satellite set on the target terminal based on the channel gain to obtain the same-frequency interference in a single-layer system;
integrating and solving the interference of each satellite in the second satellite set on the target terminal, and calculating the same frequency interference in an interlayer system;
determining average interference based on the same frequency interference in a single-layer system and the same frequency interference in an interlayer system to obtain the access capacity of the target terminal;
giving out the definition of interference factors to represent the same frequency interference of a low orbit satellite communication system and calculating the average capacity of a single satellite;
the first threshold value
Figure FDA0003597175690000041
The expression of (a) is as follows:
Figure FDA0003597175690000042
wherein h isiIs the orbital altitude, R, of the ith layer satelliteeThe radius of the earth, theta is the minimum elevation angle of satellite coverage;
the target terminal q and the satellite with the i-th layer number of m n
Figure FDA0003597175690000051
Channel gain of
Figure FDA0003597175690000052
The expression of (a) is as follows:
Figure FDA0003597175690000053
wherein G istFor satellite transmission gain, GrIn order for the terminal to receive the gain,
Figure FDA0003597175690000054
for the channel attenuation index to be determined by the frequency,
Figure FDA0003597175690000055
representing said target terminal q to the i-th layer numbered m n satellite
Figure FDA0003597175690000056
The Euclidean distance of (c);
co-channel interference within the single layer system
Figure FDA0003597175690000057
The expression of (a) is as follows:
Figure FDA0003597175690000058
wherein eta isDLFor co-frequency probability parameters, p, associated with frequency reuse strategiestIs the transmission power of the satellite signal and,
Figure FDA0003597175690000059
indicating a communication satellite at layer i No. m n,
Figure FDA00035971756900000510
representing a satellite set which possibly forms interference on a target terminal q in low-orbit layer i satellites;
co-channel interference within the inter-layer system
Figure FDA00035971756900000511
The expression of (a) is as follows:
Figure FDA00035971756900000512
wherein the content of the first and second substances,
Figure FDA00035971756900000513
representing a target terminal q to a satellite
Figure FDA00035971756900000514
The channel gain of (a) is determined,
Figure FDA00035971756900000515
representing a communication satellite numbered m n at layer j,
Figure FDA00035971756900000516
indicating a set of satellites in the low-earth layer j satellites that may interfere with the target terminal q,
Figure FDA00035971756900000517
representing said target terminal q to a satellite of layer j number m n
Figure FDA00035971756900000518
The Euclidean distance of (c);
the target terminal q access capacity
Figure FDA00035971756900000519
The expression of (a) is as follows:
Figure FDA00035971756900000520
b is a channel bandwidth, N is a noise power of a satellite-ground link, and j is the number of satellite layers with interlayer interference;
the interference factor is defined as follows:
Figure FDA00035971756900000521
target satellite
Figure FDA00035971756900000522
Average uplink interference of terminal q in coverage area
Figure FDA00035971756900000523
The expression of (a) is as follows:
Figure FDA00035971756900000524
wherein eta isULThe same-frequency probability factor related to the system frequency reuse strategy, lambda is the distribution density of Poisson points obeyed by the terminal, Pt' transmitting a signal frequency, G, for a terminalt' for terminal antenna transmission gain, Gr' as satellite reception gain, CaIs the footprint of the satellite;
uplink based average capacity of layer i satellites
Figure FDA00035971756900000525
Figure FDA0003597175690000061
Wherein, CasIs the satellite footprint area and B is the channel bandwidth.
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