CN113114397B - Heaven and earth common-frequency sharing lumped interference estimation method for satellite mobile communication system - Google Patents

Abstract

The invention discloses a method for estimating common lumped interference of space and ground common frequency of a satellite mobile communication system, which comprises the following steps: determining the type of a radio frequency terminal to be counted according to the working mode of the ground mobile communication system in the area range to be estimated, and acquiring the suburban, urban and urban deployment proportion, the deployment density and the activity factor of the ground mobile communication system; judging the relative position of the satellite beam and the ground mobile communication system, and calculating the co-frequency interference of the satellite single beam to the ground mobile communication system; and estimating all wave beams of the satellite and the same-frequency lumped interference suffered by a plurality of satellites. According to the invention, the actual conditions of the ground mobile communication system such as deployment density, activity factors and the like are fully considered, so that the authenticity and accuracy of interference analysis are improved; the co-frequency interference of the ground mobile communication system to a satellite single beam can be calculated and estimated, and the co-frequency interference to a plurality of beams or even a plurality of satellites can be estimated, so that the usability of the whole satellite mobile communication system is estimated, and the method has high practical value.

Description

Heaven and earth common-frequency sharing lumped interference estimation method for satellite mobile communication system

Technical Field

The invention relates to the technical field of satellite mobile communication, in particular to a method for estimating common-frequency common lumped interference in the sky and the earth of a satellite mobile communication system.

Background

Compared with the ground mobile communication system, the satellite mobile communication system has the remarkable advantages of wide coverage range and no limitation of terrain conditions, and plays an irreplaceable role in serving users in air, at sea, in deserts, mountains and remote areas and in unmanned areas and in dealing with ground communication infrastructure damage caused by natural disasters such as earthquakes, floods and the like. In recent years, the competition of global mobile communication frequency resources is extremely intense, particularly, the ground mobile communication system gradually develops towards the frequency band used by the traditional satellite, the frequency competition of ground services and space services is more intense, and the phenomenon that the synchronous static orbit satellite communication system and the ground communication system are compatible and shared in the same region at the same frequency is more and more common.

At present, a multi-beam antenna is widely used in a satellite mobile communication system, and multiple times of frequency reuse is realized through space isolation, so that the capacity of a communication satellite is exponentially improved. Because the satellite beam coverage is large and the diameter of the terrestrial cellular system is small, each satellite beam is simultaneously interfered by a large number of terrestrial cells, and even the uplink receiving channel of the satellite cannot work normally in severe cases. The ground mobile communication systems in different areas have great differences due to a plurality of factors such as deployment positions, topographic features, population distribution, construction cost and the like, which brings great influence on the same frequency interference of the satellite mobile communication system by accurately analyzing and estimating the ground mobile communication systems. How to accurately estimate the lumped interference of the ground mobile system to satellite single beam, single satellite and multi-satellite has very important significance for reasonably scheduling satellite mobile communication system resources and improving system availability.

A thesis of master's academic paper coexistence of 5G system and satellite fixed service interference' (Beijing post and telecommunications university, 2019) researches coexistence of 5G system and satellite system space station interference, and a thesis of co-channel interference analysis between a ground IMT system and a GEO communication satellite (the fifteenth academic annual meeting collection of satellite communication, 2019) analyzes interference caused by a ground base station to satellite uplink reception in different scenes, however, the thesis does not research the lumped interference condition of a multi-satellite multi-beam satellite communication system.

Disclosure of Invention

The invention discloses a method for estimating same-frequency common lumped interference of a satellite mobile communication system on the earth and the ground aiming at the problem of accurately estimating the lumped interference of a ground mobile system on satellite single wave beam, single satellite and multi-satellite, wherein an IMT-T (inertial measurement-time) of the ground mobile communication system consists of a plurality of ground radio frequency terminals which are dispersedly deployed; the satellite mobile communication system IMT-S consists of a space section of a plurality of multi-beam satellites, a ground gateway station and a plurality of satellite mobile user terminals; the IMT-S system and the IMT-T system both adopt frequency division multiplexing technology, and when the IMT-T system and the IMT-S system share the same frequency in the same area range, the ground radio frequency terminal forms interference to an uplink of the IMT-S system, and the method comprises the following steps:

s1, setting the IMT-S system to share S multi-beam satellites, wherein the number of beams of the ith multi-beam satellite isB_i1,2, S, each multi-beam satellite using M-color frequency division multiplexing, the jth beam of the ith satellite in the IMT-S system being denoted as f_ij；

S2, determining the ground area range of the IMT-T system to be calculated;

s3, judging the working mode of the IMT-T system, and determining the ground radio frequency terminal to be counted;

s4, acquiring the deployment proportion of the IMT-T system in suburbs, towns and cities in the ground area range;

s5, acquiring deployment density and activity factors of the IMT-T system in suburbs, towns and cities in the ground area range;

s6, calculating the number of BS/UE in suburbs, towns and cities;

s7, judging the relative position of the satellite beam and the ground mobile system;

s8, calculating the total interference of the satellite single beam by the internal and peripheral region IMT-T system BS/UE;

s9, calculating the total interference of all wave beams of a single satellite by the IMT-T system;

and S10, judging the lumped interference condition of the IMT-T system borne by the multi-satellite multi-beam satellite mobile communication system.

The invention discloses a method for estimating heaven and earth co-frequency sharing lumped interference of a satellite mobile communication system, wherein a ground mobile communication system IMT-T consists of a plurality of ground radio frequency terminals which are dispersedly deployed, and each ground radio frequency terminal comprises a base station and a ground mobile terminal; the satellite mobile communication system IMT-S consists of a space section of a plurality of multi-beam satellites, a ground gateway station and a plurality of satellite mobile user terminals; the IMT-S system and the IMT-T system both adopt frequency division multiplexing technology, when the IMT-T system and the IMT-S system share the same frequency in the same area range, the ground radio terminal forms interference on an uplink of the IMT-S system, and the satellite mobile communication system shares the lumped interference estimation method with the same frequency in the sky and the earth, and the steps of the method comprise:

s1, setting the IMT-S system to share S multi-beam satellites, wherein the number of beams of the ith multi-beam satellite isB_i1, 2.. multidata, S, each multi-beam satellite using M-color frequency division multiplexing, the jth beam of the ith satellite in the IMT-S system being denoted as f_ij；

S2, determining the ground area range of the ground mobile communication system to be calculated, and determining the ground area range of the ground mobile communication system to be calculated according to the interference strength of the ground radio frequency terminals of the IMT-T system at different positions by combining the roll-off characteristic of the satellite antenna and the deployment characteristic of the ground mobile system, wherein the ground area range area of the ground mobile communication system to be calculated is Sq;

s3, determining working modes adopted by the IMT-T system in the ground area range according to the 3GPP industry standard, wherein the working modes comprise a frequency division duplex mode FDD and a time division duplex mode TDD; if the IMT-T system adopts FDD mode, then the ground radio frequency terminal TM which needs to be counted in interference estimation_cThe method is specifically determined for an IMT-T system base station or a mobile terminal according to the division of each country; if the IMT-T system adopts TDD mode, then the ground radio frequency terminal TM needed to be counted in interference estimation_cThe system comprises an IMT-T system base station and a mobile terminal;

s4, obtaining deployment proportions of the IMT-T system in suburbs, towns and urban 3 types of areas within the ground area range by accessing the IMT-T system position database, and respectively recording the deployment proportions as Ra_ru、Ra_sub、Ra_urWherein, Ra_ru+Ra_sub+Ra_ur＝1；

S5, according to the actual deployment situation of IMT-T system operator in the ground area, obtaining the deployment density and activity factor of IMT-T system in suburbs, towns and cities, wherein the deployment density is the ratio of the number of ground radio frequency terminals to the ground area of the ground mobile communication system to be calculated, and the deployment density of IMT-T system in suburbs, towns and cities is respectively expressed as De_ru、De_sub、De_urIn units of percentage; the activity factor is the ratio of the number of the ground radio frequency terminals actually operated to the total number of the ground radio frequency terminals, and the activity factors of the IMT-T system in suburbs, towns and cities are respectively expressed as Ac_ru、Ac_sub、Ac_urIn units of percentage;

s6, calculating TM of IMT-T system in suburbs, towns and cities respectively_cNumber of IMT-T systems in suburbs, towns and cities_cAre respectively expressed as N_ru、N_subAnd N_urIn which N is_ru＝Sq·Ra_ru·De_ru·Ac_ru，N_sub＝Sq·Ra_sub·De_sub·Ac_sub，N_ur＝Sq·Ra_ur·De_ur·Ac_ur；

S7, according to TM in IMT-T system_cThe relative position of the IMT-T system and the satellite beam is divided into three types of low elevation angle, high elevation angle and medium elevation angle;

when the elevation angle of the position of the IMT-T system relative to the satellite is more than or equal to 0 degree and less than or equal to 20 degrees, the relative position of the IMT-T system and the satellite beam is marked as a low elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is more than 20 degrees and less than or equal to 70 degrees, the relative position of the IMT-T system and the satellite beam is recorded as a medium elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is larger than 70 degrees and smaller than or equal to 90 degrees, the relative position of the IMT-T system and the satellite beam is marked as a high elevation angle type;

s8, calculating the satellite single beam f_ijTM of IMT-T system by inner and peripheral area_cLumped interference quantity I_ij：

Wherein,

and

respectively representing a satellite single beam f_ijLumped interference value, P, of IMT-T systems in suburbs, towns and cities_tm,r、P_tm,suAnd P_tm,uRespectively representing r, su and u TM of IMT-T system in suburbs, towns and cities_cThe transmit power of (a);r 1,2_ru，su＝1,2,...,N_sub，u＝1,2,...,N_ur；G_tm,r、G_tm,suAnd G_tm,uRespectively representing r, su and u TMs of IMT-T system in suburbs, towns and cities_cAntenna gain in the direction of the satellite, determined by the terrestrial mobile system antenna pattern; g_sa(θ_ru)、G_sa(θ_sub)、G_sa(θ_ur) Respectively at theta for the satellite_r、θ_su、θ_uDirectional antenna gain, determined by the satellite antenna pattern, θ_r、θ_su、θ_uRespectively the satellite and the r, su and u TMs_cThe included angle of (A); l is_sIs free space loss; l is_pRepresenting the link polarization loss.

S9, calculating the total interference quantity of all beams of the ith satellite by the IMT-T system:

the unit is dB;

calculating the maximum acceptable interference value of the satellite mobile communication system according to the set value of the interference-to-noise ratio of the IMT-T system to the satellite mobile communication system, wherein if the lumped interference amount of all wave beams of a certain satellite by the IMT-T system is less than the maximum acceptable interference value, the lumped interference suffered by the satellite is acceptable, and the satellite has communication capacity;

when a set value I/N of an interference-to-noise ratio of the IMT-T system to the satellite mobile communication system is-12.2 dB, wherein I represents a total interference amount, N is KTW, K is a Boltzmann constant, T is a noise temperature of a satellite, W is a communication bandwidth, and the maximum acceptable interference value of the satellite mobile communication system is calculated as follows: i is_accept-183.2 dBm/Hz; if all wave beams of the ith satellite are subjected to the lumped interference I of the IMT-T system_i≤I_acceptIf so, the lumped interference suffered by the ith satellite is acceptable, and the ith satellite has the communication capacity;

s10, judging the lumped interference condition of the IMT-T system on the multi-satellite multi-beam satellite mobile communication system;

supposing that a certain constellation of the multi-satellite multi-beam satellite mobile communication system contains P satellites, dividing all coverage areas of the constellation into M areas according to city or task requirements, and counting the satellite availability Av of the M areas_k：

Wherein, SN_kNumber of satellites having communication capability in k-th area, SN_kAccording to step S9.

When Av_kWhen the number is 0, it means that the interference in the kth region will cause the satellite to fail to normally communicate, and there is no available satellite communication resource.

The invention has the beneficial effects that:

1. the invention fully considers the actual conditions of deployment density, distribution, geographical position and the like of the ground mobile communication system, and improves the authenticity and accuracy of interference analysis;

2. the invention can calculate and estimate the same frequency interference of the ground mobile communication system to the satellite single beam, and can estimate the same frequency interference of the ground mobile communication system to a plurality of beams of the satellite mobile communication system, even a plurality of satellites according to the requirement, thereby estimating the availability of the whole satellite mobile communication system and having higher practical value.

Drawings

FIG. 1 is a schematic diagram of uplink co-frequency lumped interference of an IMT-T system to an IMT-S system in the invention;

fig. 2 is a flowchart of an uplink co-channel lumped interference estimation method in the present invention.

Detailed Description

For a better understanding of the present disclosure, an example is given here.

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the ground mobile communication system IMT-T is composed of a plurality of ground radio frequency terminals deployed in a decentralized manner, where the ground radio frequency terminals include a base station and a ground mobile terminal, the base station is denoted as BS, and the ground mobile user terminal is denoted as UE; the satellite mobile communication system IMT-S consists of a space section of a plurality of multi-beam satellites, a ground gateway station and a plurality of satellite mobile user terminals; the IMT-S system and the IMT-T system both adopt a frequency division multiplexing technology, and when the IMT-T system and the IMT-S system share the same frequency in the same area range, the ground radio frequency terminal forms interference on an uplink of the IMT-S system.

The invention provides a method for estimating heaven-earth same frequency sharing lumped interference of a satellite mobile communication system, the flow of which is shown in figure 2, and the method comprises the following specific steps:

s1, setting the IMT-S system to share S multi-beam satellites, wherein the number of beams of the ith multi-beam satellite isB_i1, 2.. multidata, S, each multi-beam satellite using M-color frequency division multiplexing, the jth beam of the ith satellite in the IMT-S system being denoted as f_ij；

S2, determining the ground area range of the ground mobile communication system to be calculated according to the interference intensity of the ground radio frequency terminals of the IMT-T system at different positions by combining the roll-off characteristic of the satellite antenna and the deployment characteristic of the ground mobile system, or setting the ground area range of the ground mobile communication system to be calculated according to the task requirement, wherein the ground area range area of the ground mobile communication system to be calculated is Sq;

s3, determining working modes adopted by the IMT-T system in the ground area range according to the 3GPP industry standard, wherein the working modes comprise a frequency division duplex mode FDD and a time division duplex mode TDD; if the IMT-T system adopts FDD mode, then the ground radio frequency terminal TM which needs to be counted in interference estimation_cThe method is specifically determined for an IMT-T system base station or a mobile terminal according to the division of each country; if the IMT-T system adopts TDD mode, then the ground radio frequency terminal TM needed to be counted in interference estimation_cThe system comprises an IMT-T system base station and a mobile terminal;

s4, obtaining deployment proportions of the IMT-T system in suburbs, towns and urban 3 types of areas within the ground area range by accessing the IMT-T system position database, and respectively recording the deployment proportions as Ra_ru、Ra_sub、Ra_urWherein, Ra_ru+Ra_sub+Ra_ur＝1；

S5, according to the actual deployment situation of IMT-T system operator in the ground area, obtaining the deployment density and activity factor of IMT-T system in suburbs, towns and cities, wherein the deployment density is the ratio of the number of ground radio frequency terminals to the ground area of ground mobile communication system to be calculated, and the IMT-T systemThe deployment densities in suburbs, towns and cities are denoted De respectively_ru、De_sub、De_urIn units of percentage; the activity factor is the ratio of the number of the ground radio frequency terminals actually operated to the total number of the ground radio frequency terminals, and the activity factors of the IMT-T system in suburbs, towns and cities are respectively expressed as Ac_ru、Ac_sub、Ac_urIn units of percentage;

s6, calculating TM of IMT-T system in suburbs, towns and cities respectively_cNumber of IMT-T systems in suburbs, towns and cities_cAre respectively expressed as N_ru、N_subAnd N_urIn which N is_ru＝Sq·Ra_ru·De_ru·Ac_ru，N_sub＝Sq·Ra_sub·De_sub·Ac_sub，N_ur＝Sq·Ra_ur·De_ur·Ac_ur；

S7, according to TM in IMT-T system_cThe relative position of the IMT-T system and the satellite beam is divided into three types of low elevation angle, high elevation angle and medium elevation angle;

when the elevation angle of the position of the IMT-T system relative to the satellite is more than or equal to 0 degree and less than or equal to 20 degrees, the relative position of the IMT-T system and the satellite beam is marked as a low elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is more than 20 degrees and less than or equal to 70 degrees, the relative position of the IMT-T system and the satellite beam is recorded as a medium elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is larger than 70 degrees and smaller than or equal to 90 degrees, the relative position of the IMT-T system and the satellite beam is marked as a high elevation angle type;

s8, calculating the satellite single beam f_ijTM of IMT-T system by inner and peripheral area_cLumped interference quantity I_ij：

Wherein,

and

respectively representing a satellite single beam f_ijLumped interference value, P, of IMT-T systems in suburbs, towns and cities_tm,r、P_tm,suAnd P_tm,uRespectively representing r, su and u TM of IMT-T system in suburbs, towns and cities_cThe transmit power of (a); r 1,2_ru，su＝1,2,...,N_sub，u＝1,2,...,N_ur；G_tm,r、G_tm,suAnd G_tm,uRespectively representing r, su and u TMs of IMT-T system in suburbs, towns and cities_cThe antenna gain in the direction of the satellite, since the direction of the terrestrial mobile system is generally horizontal, can be considered as a constant gain of the terrestrial system in the direction of the satellite, which is determined by the terrestrial mobile system antenna pattern, also referred to the ITU-r m.2292 recommendation; g_sa(θ_ru)、G_sa(θ_sub)、G_sa(θ_ur) Respectively at theta for the satellite_r、θ_su、θ_uDirectional antenna gain, determined by the satellite antenna pattern, θ_r、θ_su、θ_uRespectively the satellite and the r, su and u TMs_cThe included angle of (A); l is_sIs free space loss; l is_pIndicating link polarization loss, caused by the inconsistency of the polarization of the satellite-borne antenna with that of the signal of the IMT-T system.

S9, calculating the total interference quantity of all beams of the ith satellite by the IMT-T system:

the unit is dB;

calculating the maximum acceptable interference value of the satellite mobile communication system according to the interference-to-noise ratio set value of the IMT-T to the satellite mobile communication system, wherein if the lumped interference amount of all wave beams of a certain satellite by the IMT-T system is less than the maximum acceptable interference value, the lumped interference suffered by the satellite is acceptable, and the satellite has communication capacity;

when IMT-When the interference noise ratio set value of the T to the satellite mobile communication system is I/N-12.2 dB, wherein I represents total interference amount, N is KTW, K is Boltzmann constant, T is the noise temperature of the satellite, W is the communication bandwidth, the maximum acceptable interference value of the satellite mobile communication system is calculated as follows: i is_accept-183.2 dBm/Hz; if all wave beams of the ith satellite are subjected to the lumped interference I of the IMT-T system_i≤I_acceptIf so, the lumped interference suffered by the ith satellite is acceptable, and the ith satellite has the communication capacity;

s10, judging the lumped interference condition of the IMT-T system on the multi-satellite multi-beam satellite mobile communication system;

supposing that a certain constellation of the multi-satellite multi-beam satellite mobile communication system contains P satellites, dividing all coverage areas of the constellation into M areas according to city or task requirements, and counting the satellite availability Av of the M areas_k：

Wherein, SN_kNumber of satellites having communication capability in k-th area, SN_kAccording to step S9.

When Av_kWhen the number is 0, it means that the interference in the kth region will cause the satellite to fail to normally communicate, and there is no available satellite communication resource.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (2)

1. A satellite mobile communication system common-frequency common-use lumped interference estimation method is characterized in that a ground mobile communication system IMT-T consists of a plurality of ground radio frequency terminals which are dispersedly deployed; the satellite mobile communication system IMT-S consists of a space section of a plurality of multi-beam satellites, a ground gateway station and a plurality of satellite mobile user terminals; the IMT-S system and the IMT-T system both adopt frequency division multiplexing technology, when the IMT-T system and the IMT-S system share the same frequency in the same area range, the ground radio terminal forms interference on an uplink of the IMT-S system, and the satellite mobile communication system shares the lumped interference estimation method with the same frequency in the sky and the earth, and the steps of the method comprise:

s1, setting the IMT-S system to share S multi-beam satellites, wherein the number of beams of the ith multi-beam satellite is B_i1, 2.. multidata, S, each multi-beam satellite using M-color frequency division multiplexing, the jth beam of the ith satellite in the IMT-S system being denoted as f_ij；

S2, determining the ground area range of the ground mobile communication system to be calculated, and determining the ground area range of the ground mobile communication system to be calculated according to the interference strength of the ground radio frequency terminals of the IMT-T system at different positions by combining the roll-off characteristic of the satellite antenna and the deployment characteristic of the ground mobile system, wherein the ground area range area of the ground mobile communication system to be calculated is Sq;

s3, determining working modes adopted by the IMT-T system in the ground area range according to the 3GPP industry standard, wherein the working modes comprise a frequency division duplex mode FDD and a time division duplex mode TDD; if the IMT-T system adopts FDD mode, then the ground radio frequency terminal TM which needs to be counted in interference estimation_cThe mobile terminal is an IMT-T system base station or a mobile terminal; if the IMT-T system adopts TDD mode, then the ground radio frequency terminal TM needed to be counted in interference estimation_cThe system comprises an IMT-T system base station and a mobile terminal;

s4, obtaining deployment proportions of the IMT-T system in suburbs, towns and urban 3 types of areas within the ground area range by accessing the IMT-T system position database, and respectively recording the deployment proportions as Ra_ru、Ra_sub、Ra_urWherein, Ra_ru+Ra_sub+Ra_ur＝1；

S5, according to the actual deployment situation of IMT-T system operator in the ground area, obtaining the deployment density and activity factor of IMT-T system in suburbs, towns and cities, wherein the deployment density is the ratio of the number of ground radio frequency terminals to the ground area of ground mobile communication system to be calculated, and the IMT-T system in suburbsThe deployment densities in a district, town and city are denoted De respectively_ru、De_sub、De_urIn units of percentage; the activity factor is the ratio of the number of the ground radio frequency terminals actually operated to the total number of the ground radio frequency terminals, and the activity factors of the IMT-T system in suburbs, towns and cities are respectively expressed as Ac_ru、Ac_sub、Ac_urIn units of percentage;

s6, respectively calculating IMT-T systems TM in suburbs, towns and cities_cNumber of IMT-T systems in suburbs, towns and cities_cThe numbers are respectively expressed as N_ru、N_subAnd N_urIn which N is_ru＝Sq·Ra_ru·De_ru·Ac_ru，N_sub＝Sq·Ra_sub·De_sub·Ac_sub，N_ur＝Sq·Ra_ur·De_ur·Ac_ur；

S7, according to TM in IMT-T system_cThe relative position of the IMT-T system and the satellite beam is divided into three types of low elevation angle, high elevation angle and medium elevation angle;

when the elevation angle of the position of the IMT-T system relative to the satellite is more than or equal to 0 degree and less than or equal to 20 degrees, the relative position of the IMT-T system and the satellite beam is marked as a low elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is more than 20 degrees and less than or equal to 70 degrees, the relative position of the IMT-T system and the satellite beam is recorded as a medium elevation angle type; when the elevation angle of the position of the IMT-T system relative to the satellite is larger than 70 degrees and smaller than or equal to 90 degrees, the relative position of the IMT-T system and the satellite beam is marked as a high elevation angle type;

s8, calculating the satellite single beam f_ijTM of IMT-T system by inner and peripheral area_cLumped interference quantity I_ij：

Wherein,

and

respectively representing a satellite single beam f_ijLumped interference value, P, of IMT-T systems in suburbs, towns and cities_tm,r、P_tm,suAnd P_tm,uRespectively representing r, su and u TM of IMT-T system in suburbs, towns and cities_cThe transmit power of (a); r 1,2_ru，su＝1,2,...,N_sub，u＝1,2,...,N_ur；G_tm,r、G_tm,suAnd G_tm,uRespectively representing r, su and u TMs of IMT-T system in suburbs, towns and cities_cAntenna gain in the satellite direction, determined by the IMT-T system antenna pattern; g_sa(θ_r)、G_sa(θ_su)、G_sa(θ_u) Respectively at theta for the satellite_r、θ_su、θ_uDirectional antenna gain, determined by the satellite antenna pattern, θ_r、θ_su、θ_uRespectively the satellite and the r, su and u TMs_cThe included angle of (A); l is_sIs free space loss; l is_pRepresents link polarization loss;

s9, calculating the total interference quantity of all beams of the ith satellite by the IMT-T system:

the unit is dB;

calculating the maximum acceptable interference value of the satellite mobile communication system according to the set value of the interference-to-noise ratio of the IMT-T system to the satellite mobile communication system, wherein if the lumped interference amount of all wave beams of a certain satellite by the IMT-T system is less than the maximum acceptable interference value, the lumped interference suffered by the satellite is acceptable, and the satellite has communication capacity;

s10, judging the lumped interference condition of the IMT-T system on the multi-satellite multi-beam satellite mobile communication system;

suppose that a certain constellation of the multi-satellite and multi-beam satellite mobile communication system contains P satellitesThe star divides all coverage areas of the constellation into M areas according to city or task requirements, and counts satellite availability Av of the M areas_k：

Wherein, SN_kNumber of satellites having communication capability in k-th area, SN_kAccording to step S9;

when Av_kWhen the number is 0, it means that the interference in the kth region will cause the satellite to fail to normally communicate, and there is no available satellite communication resource.

2. The method of claim 1, wherein the rf terminals include a base station and a ground mobile terminal.

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