CN108712202B - The method and satellite communication system for evading co-channel interference are directed toward by deflection antenna - Google Patents
The method and satellite communication system for evading co-channel interference are directed toward by deflection antenna Download PDFInfo
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- H—ELECTRICITY
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Abstract
The present invention relates to a kind of methods and satellite communication system for evading co-channel interference by deflection antenna direction comprising: more than one satellite antenna is provided on NGEO telecommunication satellite；The constellation configuration and terrestrial user type and distribution situation for determining NGEO satellite communication system, select the normal direction orientation of antenna on variable description NGEO satellite communication system star；It is provided according to the interference protection about GEO satellite system of ITU, selects one group of measurement satellite communication system to the index α of GEO satellite system interference degree；Requirement according to satellite communication system to self communication quality determines the index β of one group of measurement satellite communication system link-quality；The Non-linear Optimal Model in phased array antenna normal direction orientation is established according to index α and index β；By iteratively solving optimized variable, exports a set of optimal phased array antenna deflection and be directed toward the plan of establishment.This invention ensures that itself communication link quality and reliability requirement, enable the satellite system effectively to coexist frequently together with GEO satellite system.
Description
Technical field
The present invention relates to a kind of aerospace engineering fields of communication technology, are evaded especially with regard to one kind by deflection antenna direction
The method and satellite communication system of co-channel interference.
Background technique
In recent years, propose to build low rail constellation by the emerging business aerospace enterprise group represented of SpaceX, OneWeb as the whole world
Internet access service is provided, and steps up layout and seizes development first chance, a satellite driven by technological innovation and commercial capital
Internet development tide just have swepts the globe.International Telecommunication Union (ITU) is responsible for managing international spectrum resource and rail as the United Nations
The important mechanism of position resource, carries out the principle of " arrive first first " for frequency application, and the system applied afterwards is needed to there is priority
Satellite system propose frequency coordination, must not be to needing system to be protected especially synchronous satellite system to generate harmful interference.It is huge
Contradiction between big spectrum requirement and limited frequency resource is the key difficulties of the numerous satellite internet development of constraint how
It realizes effectively with GEO satellite system with the task of top priority coexisted frequently as NGEO systems face.
Currently, between the NGEO satellite system and GEO satellite system using Ku and Ka frequency range, there are potential frequencies
Interference problem, the main technology for alleviating interference are as follows: when NGEO satellite is located at middle lower latitude overhead, by closing subwave
Beam reduces the overlay area of single satellite, increases the angle of departure with GEO satellite link, forms airspace isolation to reduce interference；
When NGEO satellite is located near the overhead of equator, satellite shutdown stops offer service.In order to guarantee that NGEO constellation integrally covers model
It encloses unaffected, generallys use the covering tuple that backup star improves low rail constellation, constellation totle drilling cost has been significantly greatly increased.
In the recent period, Oneweb company proposes the technology of a kind of entitled " Progressive Pitch ", the basic principle is that defending
Star antenna gradually tilts cooperation satellite beams and closes, and satellite antenna equatorward tilts in orbit plane always, and tilts
Angle increase with the reduction of latitude, have the symmetrical characteristic of southern hemisphere and northern hemisphere；When satellite is close to equator overhead, satellite must
It must shut down and complete the quick reverse turn operation of antenna tilt angle.This method, which can reach to evade, interferes GEO satellite system same frequency
Effect, but the earth station that will lead to mid low latitude region accesses low elevation angle satellite, and the carrier-to-noise ratio of entire communication system is by tight
Ghost image is rung.By taking the 1200km orbit altitude of OneWeb constellation as an example, after the technology, satellite-ground link may farthest increase by 3 times,
Corresponding carrier-to-noise ratio decline reaches 9dB or more.And each rail of satellite requires to adjust antenna repeatedly in north and south latitude low latitudes
Be directed toward, for low orbit satellite, an orbital period is dozens of minutes, the operation that this frequent adjustment antenna is directed toward to satellite can
Very high challenge is proposed by property and service life.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of methods for evading co-channel interference by deflection antenna direction
And satellite communication system, it is dry to the same frequency of GEO satellite system (including but are not limited to satellite communication system) effectively evading
Under the premise of disturbing, do not significantly reduce system carrier-to-noise ratio, do not increase number of satellites, satellite system without shutdown, can also by be arranged it is quiet
The deflection angle scheme of state avoids operating on frequent star, ensure that itself communication link quality and reliability requirement, so that
The satellite system can effectively coexist frequently together with GEO satellite system.
To achieve the above object, the present invention takes following technical scheme: one kind is evaded dry with frequency by deflection antenna direction
The method disturbed, it is characterised in that the following steps are included: 1) being provided with more than one satellite antenna on NGEO telecommunication satellite；2)
The constellation configuration and terrestrial user type and distribution situation for determining NGEO satellite communication system, select variable description NGEO satellite
The normal direction orientation of antenna on communication system star；3) it is provided according to the interference protection about GEO satellite system of ITU, selects one group
Satellite communication system is measured to the index α of GEO satellite system interference degree；4) according to satellite communication system to self communication quality
Requirement, determine the index β of one group of measurement satellite communication system link-quality；5) phased array day is established according to index α and index β
Non-linear Optimal Model of the collimation method to orientation；6) by iterative solution optimized variable, it is inclined to export a set of optimal phased array antenna
Turn to be directed toward the plan of establishment.
Further, in the step 3), measure satellite communication system to the index α of GEO satellite system interference degree=
[α1,...,αn]T, wherein each index is no more than limit value specified in ITU related advisory book, αi≤αith, i=1 ...,
n；Wherein, n indicates the number of index, αiIndicate i-th of interference index for being used to describe system interference degree；αithIt indicates i-th
Index corresponds to the limit value specified in ITU recommendation.
Further, in the step 4), index β=[β of satellite communication system link-quality is measured1,...,βn]T, βiTable
Show i-th of index for being used to measure satellite communication system link-quality, i=1 ..., n.
Further, in the step 2), the constellation structure of NGEO satellite communication system is set according to own system business demand
Type and terrestrial user type and distribution situation, classification of track, orbital plane number including constellation, the orbital tracking of each orbital plane and
Satellite distribution situation in face；Ground in the type of terrestrial user, the average distance at ground co-frequency cell center and ground co-frequency cell
The density of face user.
Further, in the step 2), the variables choice in the normal direction orientation of antenna on NGEO satellite communication system star is described
Method are as follows: using satellite and the line in the earth's core as axis, on star the normal direction orientation of phased array antenna with two degree of angular freedoms describe θ=
[θ1,θ2]T, θ1For degree of angular freedom 1, θ2For degree of angular freedom 2；And phased array antenna normal direction orientation adjustment is described with time variable t
With the relationship of time.
Further, in the step 5), the Non-linear Optimal Model in phased array antenna normal direction orientation are as follows:
Optimized variable: θ (t)；
Objective function: max { β }；
Constraint condition: αi≤αith, i=1 ..., n and other existing singal reporting codes are constrained.
Further, in the step 3) and step 4), the interference to GEO satellite system accordingly and self communication matter are determined
The method of amount are as follows: calculate the relative positional relationship of NGEO satellite communication system Yu GEO satellite system first；Then calculating is utilized
Obtained relative positional relationship is sought for describing the interference to GEO satellite system and the correspondence index of self communication quality.
It is a kind of that NGEO satellite communication system that evading co-channel interference, spy are directed toward by deflection antenna based on the above method
Sign is: it includes being located at the constellation of several NGEO satellites composition of multiple orbital planes and positioned at the whole world or low latitudes
Several earth stations；Every satellite has more than one satellite antenna；Each satellite in NGEO satellite communication system is according to the side
The plan of establishment is directed toward in the optimal phased array antenna deflection of method output, chooses the deflection that existing implementation is directed toward satellite antenna
Control realizes while evading with geosynchronous satellite generation co-channel interference, and self communication link performance does not deteriorate significantly
Purpose.
Further, the implementation follows satellite health to rotate using antenna, is deflected by the gesture stability of satellite
Antenna is directed toward；Or using antenna itself with respect to star rotation, the static state including the installation normal direction by adjusting phased array antenna is real
Existing mode, and antenna normal direction orientation is dynamically adjusted by mechanically or electrically control mode.
A kind of be directed toward by deflection antenna evades the Optimum Design System of co-channel interference, it is characterised in that: the system includes
Mould is arranged to orientation describing module, annoyance level setup measures module, Link Quality Index in antenna method on initialization module, star
Block, Non-linear Optimal Model establish module and scheme output module；The initialization module is for determining NGEO satellite communication system
The constellation configuration and terrestrial user type and distribution situation of system, while more than one is provided on each NGEO telecommunication satellite
Satellite antenna；Antenna method is to orientation describing module for selecting variable description NGEO satellite communication system star to go up to the sky on the star
The normal direction orientation of line；The annoyance level setup measures module provides according to ITU about the interference protection of GEO satellite system,
Select one group of measurement satellite communication system to the index α of GEO satellite system interference degree；The Link Quality Index setup module
Requirement according to satellite communication system to self communication quality determines the index β of one group of measurement satellite communication system link-quality；
The Non-linear Optimal Model establishes the nonlinear optimization that module establishes phased array antenna normal direction orientation according to index α and index β
Model；The scheme output module is exported a set of optimal phased array antenna deflection direction and is set by iterative solution optimized variable
Set scheme.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention passes through optimization phased array antenna
Direction scheme, which increases, is isolated angle with the link of GEO satellite system, is effectively evading the co-channel interference premise to GEO satellite system
Under, do not significantly reduce system carrier-to-noise ratio, do not increase number of satellites, satellite system can be by static inclined of setting without shutdown, also
Gyration scheme avoids operating on frequent star, ensure that itself communication link quality and reliability requirement.2, the present invention with
Existing GEO satellite system same frequency co-existence schemes are compared, and the same frequency to GEO satellite system can be evaded with simple way of realization
Interference, while the communication quality demand of the guarantee own system of maximum possible, and do not increase number of satellites, satellite system without closing
Machine can also avoid operating on frequent star by the static deflection angle scheme of setting, improve system reliability.3, energy of the present invention
The average covering power for increasing constellation, evades the interference to GEO satellite system, in conjunction with the communication link of satellite communication system itself
Quality requirement optimizes the deflection direction and degree of deflection that antenna is directed toward, and can satisfy wanting for self communication service quality and reliability
It asks, is reduced to the cost evaded and paid the interference of GEO satellite system.
Detailed description of the invention
Fig. 1 a is antenna scheme of installation in the prior art under normal conditions；
Fig. 1 b is to deflect antenna in the specific embodiment of the invention to be directed toward scheme schematic diagram；
Fig. 2 a is the operable time percentage schematic diagram at Universal Terrestrial station when phased array does not deflect in the embodiment of the present invention；
The operable time percentage signal at Universal Terrestrial station when Fig. 2 b is phased array optimal deflection in the embodiment of the present invention
Figure；
Fig. 3 a is effective received signal strength schematic diagram at Universal Terrestrial station when phased array does not deflect in the embodiment of the present invention；
Effective received signal strength signal at Universal Terrestrial station when Fig. 3 b is phased array optimal deflection in the embodiment of the present invention
Figure；
Fig. 4 a is the constellation and coverage map when phased array does not deflect in the embodiment of the present invention；
Constellation and coverage map when Fig. 4 b is phased array optimal deflection in the embodiment of the present invention.
Specific embodiment
For rail (LEO) satellite communication system especially low for Non GEO satellite system (NGEO), single star covering
Ability is limited and low latitudes covering tuple is lower, and the link angle of LEO satellite communication system and GEO satellite system can be with
The reduction of latitude and reduce, be apparent from, the problem of co-channel interference of low latitudes is the most serious.Phased array antenna is low rail constellation
One of the trend of load development.However current phase array antenna beam scanning angle is limited in scope, it is most of to use phased array
The LEO satellite communication system of antenna is only low latitudes and provides continuous repetition lid.When LEO satellite with running to low latitude
When area overhead, it can only be forced to shut down when only LEO link pair GEO satellite system generates interference, satellite communication system
Without other available links, can not work normally.As shown in Figure 1 a, 1 b, when the direction of LEO satellite deflection phased array antenna,
It increases link between LEO and GEO satellite system and angle is isolated, while increasing the average covering tuple of constellation.In present satellites link
Earth station is switched to next LEO satellite when co-channel interference may occur with GEO satellite system link, and satellite system is without shutdown
It can be realized and the interference of GEO system is evaded.Optimize the deflection direction and angular dimension that antenna is directed toward, can guarantee that earth station connects
Link load when entering next LEO satellite will not dramatically increase.
It deflects there are many modes that satellite system antennas is directed toward, can be antenna and satellite health is followed to rotate, i.e., by defending
The gesture stability of star is directed toward to deflect antenna；It is also possible to antenna itself with respect to star rotation, including by adjusting phased array day
The installation normal direction (antenna deflection installation) of line carrys out static implementation, and dynamically adjusts antenna by mechanically or electrically controlling
The mode of normal direction.In addition, the link quality requirement in conjunction with satellite communication system itself and the interference protection to GEO satellite system
Standard designs the normal direction prioritization scheme of phased array antenna, with reach under the premise of not interfering GEO satellite system itself obtain compared with
Good communication quality and the purpose for improving reliability.The present invention is described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of method be directed toward by deflection antenna and evade co-channel interference, and this method is logical for NGEO satellite
In letter system comprising following steps:
1) more than one satellite antenna is provided on NGEO telecommunication satellite；
2) the constellation configuration and terrestrial user type and distribution situation for determining NGEO satellite communication system, select variable to retouch
State the normal direction orientation of antenna on NGEO satellite communication system star；
According to the constellation configuration of own system business demand setting NGEO satellite communication system and terrestrial user type and divide
Cloth situation, including but not limited to the following aspects: classification of track, the orbital plane number of constellation, the orbital tracking of each orbital plane
And satellite distribution situation in face；In the type of terrestrial user, the average distance and ground co-frequency cell at ground co-frequency cell center
The density etc. of terrestrial user；
The Variable Selection in the normal direction orientation of antenna on NGEO satellite communication system star is described are as follows: due to the antenna of satellite
It needs to establish link with terrestrial user antenna, using satellite and the line in the earth's core as axis, the normal direction orientation of phased array antenna can on star
To describe θ=[θ with two degree of angular freedoms1,θ2]T, θ1For degree of angular freedom 1, θ2For degree of angular freedom 2, wherein the deflection of antenna normal direction
It is not limited in satellite orbit plane or any other plane；And phased array antenna normal direction orientation is described with time variable t
Adjustment and the relationship of time, but install if the deflection of antenna, then belong to static deflection mode, i.e., antenna normal direction orientation and when
Between it is unrelated；
3) it is provided according to the interference protection about GEO satellite system of ITU, selects one group of measurement satellite communication system pair
Index α=[α of GEO satellite system interference degree1,...,αn]T, such as interference-to-noise ratio I/N, carrier interference ratio C/I, wherein each
Index is no more than limit value, i.e. α specified in ITU related advisory booki≤αith, i=1 ..., n；Wherein, I indicates interference letter
Number power；N indicates GEO satellite system receiver noise power, and C indicates the carrier signal power of GEO satellite system receiving terminal；n
Indicate the number of index, αiIndicate i-th of interference index for being used to describe system interference degree；αithIndicate that i-th of index is corresponding
The limit value specified in ITU recommendation；
4) requirement according to satellite communication system to self communication quality determines one group of measurement satellite communication system link matter
Index β=[β of amount1,...,βn]T, such as receiver carrier-to-noise ratio C/N and earth station's available duration accounting；βiIndicate i-th of use
In the index for measuring satellite communication system link-quality, i=1 ..., n；
5) Non-linear Optimal Model in phased array antenna normal direction orientation is established according to index α and index β；
The Non-linear Optimal Model in phased array antenna normal direction orientation are as follows:
Optimized variable: θ (t)；
Objective function: max { β }；
Constraint condition: αi≤αith, i=1 ..., n and other existing singal reporting codes are constrained, for example, receiving end noise
It is greater than receiver signal-noise ratio threshold than SNR, earth station's available duration accounting meets system uptime accounting requirement etc.；
6) by iterative solution optimized variable θ (t), so that exporting a set of optimal phased array antenna deflection is directed toward setting side
Case.
Above-mentioned steps 3) and step 4) in, determine the side of the interference to GEO satellite system and self communication quality accordingly
Method are as follows: the relative positional relationship for calculating NGEO satellite communication system Yu GEO satellite system first is done such as communication link distance
Disturb the angle etc. of link range and communication link and interfering link；Then calculated relative positional relationship is sought
For describing the interference to GEO satellite system and the correspondence index of self communication quality.
Based on the above method, the present invention also provides a kind of NGEO satellite for evading co-channel interference by deflection antenna direction is logical
Letter system comprising positioned at the constellation of several NGEO satellites composition of multiple orbital planes and positioned at global or low latitudes
Several earth stations；Every satellite has more than one satellite antenna.Wherein, each satellite in NGEO satellite communication system is according to upper
The plan of establishment is directed toward in the optimal phased array antenna deflection for stating method output, chooses what existing implementation was directed toward satellite antenna
Deflection control realizes while evading with geosynchronous satellite generation co-channel interference, and self communication link performance is not significant
The purpose of deterioration.In the present embodiment, implementation can be antenna satellite health followed to rotate, that is, pass through the posture control of satellite
System is directed toward to deflect antenna；It is also possible to antenna itself with respect to star rotation, including the Method for Installation by adjusting phased array antenna
Antenna normal direction is dynamically adjusted to the static implementation such as (antenna deflection installation), and by the modes such as mechanically or electrically controlling
Orientation.
The present invention also provides a kind of Optimum Design Systems for evading co-channel interference by deflection antenna direction comprising initial
Change module, on star antenna method to orientation describing module, annoyance level setup measures module, Link Quality Index setup module, non-
Linear optimization model building module and scheme output module.
Initialization module be used for determine NGEO satellite communication system constellation configuration and terrestrial user type and distribution feelings
Condition, while more than one satellite antenna is provided on each NGEO telecommunication satellite；
Antenna method is used to select the method for antenna on variable description NGEO satellite communication system star to orientation describing module on star
To orientation；
Annoyance level setup measures module is provided according to the interference protection about GEO satellite system of ITU, selects one group of weighing apparatus
Satellite communication system is measured to the index α of GEO satellite system interference degree；
Requirement of the Link Quality Index setup module according to satellite communication system to self communication quality determines one group of measurement
The index β of satellite communication system link-quality；
Non-linear Optimal Model establishes module and establishes the non-linear of phased array antenna normal direction orientation according to index α and index β
Optimized model；
Scheme output module exports a set of optimal phased array antenna deflection and is directed toward setting by iterative solution optimized variable
Scheme.
Embodiment:
Satellite communication system is low rail (LEO) Walker constellation, NesA earth station is global intensive uniformly distributed.LEO star
That there are downstream frequencies is overlapping with GEO band for seat, and the orbit parameter of two systems is as shown in table 1.
The simulation parameter of table 1 LEO constellation and GEO band
Choose roll angle Ψ and pitch angle Θ under antenna coordinate system describe antenna method on star to orientation, it is assumed that antenna
(being unrelated with the time) is installed in deflection, then θ=[Ψ, Θ]T；Interference-to-noise ratio I/N is chosen as measurement satellite system to GEO system
The index of annoyance level, according to the relevant regulations of ITU recommendation, I/N is less than the threshold value equal to -12.2dB as defined in ITU；
Choose carrier-to-noise ratio C/N, earth station's available duration accountingAs the index for measuring satellite system link-quality.
After description variable and evaluation index has been determined, the interference to GEO system accordingly and self communication matter need to be determined
The calculation method of amount.Interference and self communication quality of this example using the method analytical Calculation LEO constellation of statistics to GEO band.
For a constellation, reference satellite state in constellation once it is determined that, the state of other satellites of constellation also uniquely determines,
I.e. entire constellation is actually equivalent to reference satellite in the traversal of state feasible zone in the traversal of time-domain.Since LEO constellation is
The state of Walker constellation configuration, reference satellite can be defined as x=[Ω0M0]T, wherein Ω0And M0Respectively reference satellite
Right ascension of ascending node and mean anomaly.Then the state of other satellites can indicate are as follows:
Wherein, N is satellite number, and P is orbital plane number, and F is phase factor.
Time-domain is mapped to status field, the corresponding reference satellite state samples of each time sampling point.Assuming that
The Ω of reference satellite0And M0Space is by NdA discrete point equal part, then altogetherA state, in the corresponding constellation of each state samples
The state of other satellites can be calculated by (1) formula and be obtained.For k-th of state samples, it is available to define m-th of earth station
For link can be established with it in the presence of an at least LEO satellite, and link radiation to each GEO system receiving terminal I/N respectively less than-
12.2dB, corresponding δi,k=1, otherwise δi,k=0；The carrier-to-noise ratio for defining institute's link connection receiving end of m-th of earth station is (C/N)i,k。
Entire state space is traversed, the available duration of m-th of earth station is calculated by space geometry relationship and link budget formula
AccountingReceiving end average signal-to-noise ratio is
Further, following Non-linear Optimal Model is constructed:
Optimized variable: [Ψ, Θ]T；
Objective function:
Constraint condition:
Phase is completed using the track constant and LEO, GEO system communication parameter that provide in table 2 and above-mentioned Analytic Calculation
It should emulate, optimum deflection antenna is exported by continuous iteration and is oriented to Ψ=- 5.26 °, Θ=11.57 °.The day of comparison deflection below
The simulation result of line installation and conventional aerial installation (Ψ=0 °, Θ=0 °).As shown in table 3, it can be found that worst earth station is flat
Equal pot life percentage is promoted from 69.23% to 95.11%, and worst earth station effectively receives power only under 23.18dB
22.08dB is dropped to, the carrier-to-noise ratio less than 2dB is only sacrificed, has exchanged the significantly promotion of earth station's available duration for.
2 orbit parameter of table and LEO and GEO system communication parameter
The comparison of the worst earth station's communication performance of table 3
As shown in Fig. 2 a~Fig. 3 b, it compared the effective time percentage in table 3 in the case of two kinds and effectively receive
Power, it can be found that after using the deflection of the static antennas of this example optimal, the LEO earth station operable time of low latitudes
Percentage is significantly improved, and the cost paid is that there are certain 1 to arrive for effective reception power of low latitudes earth station
The reduction of 2dB influences very little to the link-quality of LEO system.Fig. 4 a, Fig. 4 b give the wave beam that two kinds of constellations are listed in table 3
Coverage condition, it can be found that the coverage area of satellite beams is extended, into one after deflecting the installation direction of phased array antenna
Step improves the covering tuple in low latitudes LEO constellation.
It should be pointed out that SSO (Sun Synchronous Orbit) Walker constellation, antenna static deflection angular arrangements given by the present embodiment and building
Mould and optimization method etc. are all a kind of realizations of technology according to the present invention, which is not limited to SSO (Sun Synchronous Orbit) constellation or Walker
Constellation does not limit to static antenna deflection angle scheme, is not limited to the reconciliation of the evaluation indexes such as I/N, C/N, available duration accounting
Analyse modeling and optimization method.In addition, the technical solution is also not limited to the interference evaded to GEO satellite, can also be applied to evade
To the co-channel interference of certain non-geo satellite systems, such as work in the O3b satellite system of 8000km height equatorial orbit.
As the above analysis, it is proposed by the present invention by deflection antenna be directed toward evade with geosynchronous satellite interference defend
Star communication system can effectively evade the co-channel interference to GEO system, do not significantly reduce system carrier-to-noise ratio, do not increase satellite
Number, satellite system can avoid operating on frequent star without shutdown, also by the static deflection angle scheme of setting, ensure that
The communication link quality and reliability requirement of itself.
The various embodiments described above are merely to illustrate the present invention, and each step may be changed, in the technology of the present invention
On the basis of scheme, the improvement and equivalents that all principles according to the present invention carry out separate step should not be excluded in this hair
Except bright protection scope.
Claims (8)
1. a kind of be directed toward the method for evading co-channel interference by deflection antenna, it is characterised in that the following steps are included:
1) more than one satellite antenna is provided on NGEO telecommunication satellite；
2) the constellation configuration and terrestrial user type and distribution situation for determining NGEO satellite communication system, select variable description
The normal direction orientation of antenna on NGEO satellite communication system star；Wherein, the normal direction side of antenna on NGEO satellite communication system star is described
Position Variable Selection are as follows: using satellite and the line in the earth's core as axis, on star the normal direction orientation of phased array antenna with two angles oneself
θ=[θ is described by degree1,θ2]T, θ1For degree of angular freedom 1, θ2For degree of angular freedom 2；And phased array antenna method is described with time variable t
To the relationship of orientation adjustment and time；
3) it is provided according to the interference protection about GEO satellite system of ITU, one group of measurement satellite communication system is selected to defend GEO
The index α of star system annoyance level；
4) requirement according to satellite communication system to self communication quality determines one group of measurement satellite communication system link-quality
Index β；
5) Non-linear Optimal Model in phased array antenna normal direction orientation, the phased array antenna method are established according to index α and index β
To the Non-linear Optimal Model in orientation are as follows: optimized variable: θ (t)；
Objective function: max { β }；
Constraint condition: αi≤αith, i=1 ..., n；
6) it by iterative solution optimized variable, exports a set of optimal phased array antenna deflection and is directed toward the plan of establishment.
2. the method as described in claim 1, it is characterised in that: in the step 3), measure satellite communication system to GEO satellite
Index α=[α of system interference degree1,...,αn]T, wherein each index is no more than specified in ITU related advisory book
Limit value, αi≤αith, i=1 ..., n；Wherein, n indicates the number of index, αiIt indicates to be used to describe system interference degree for i-th
Interfere index；αithIndicate the corresponding limit value specified in ITU recommendation of i-th of index.
3. the method as described in claim 1, it is characterised in that: in the step 4), measure satellite communication system link-quality
Index β=[β1,...,βn]T, βiIndicate i-th for measuring the index of satellite communication system link-quality, i=1 ...,
n。
4. the method as described in claim 1, it is characterised in that: in the step 2), be arranged according to own system business demand
The constellation configuration and terrestrial user type and distribution situation of NGEO satellite communication system, classification of track, orbital plane including constellation
It counts, satellite distribution situation in the orbital tracking of each orbital plane and face；The type of terrestrial user, ground co-frequency cell center it is flat
The density of terrestrial user in equal distance and ground co-frequency cell.
5. such as the described in any item methods of Claims 1 to 4, it is characterised in that: in the step 3) and step 4), determine corresponding
The interference and self communication quality to GEO satellite system method are as follows: calculate NGEO satellite communication system first and defended with GEO
The relative positional relationship of star system；Then calculated relative positional relationship is sought for describing to GEO satellite system
Interference and self communication quality correspondence index.
6. a kind of based on being directed toward by deflection antenna such as any one of Claims 1 to 5 the method and to evade co-channel interference
NGEO satellite communication system, it is characterised in that: it include positioned at multiple orbital planes several NGEO satellites form constellation and
Positioned at the whole world or several earth stations of low latitudes；Every satellite has more than one satellite antenna；NGEO satellite communication system
The plan of establishment is directed toward in the optimal phased array antenna deflection that each satellite in system is exported according to the method, chooses existing realization side
Formula controls the deflection that satellite antenna is directed toward, and realizes while evading with geosynchronous satellite generation co-channel interference, itself
The purpose that communication link performance does not deteriorate significantly.
7. system as claimed in claim 6, it is characterised in that: the implementation follows satellite health to rotate using antenna,
Antenna direction is deflected by the gesture stability of satellite；Or using antenna itself with respect to star rotation, including by adjusting phased
The static implementation of the installation normal direction of array antenna, and antenna normal direction side is dynamically adjusted by mechanically or electrically control mode
Position.
8. a kind of be directed toward the Optimum Design System for evading co-channel interference by deflection antenna, it is characterised in that: the system includes just
In beginningization module, star antenna method to orientation describing module, annoyance level setup measures module, Link Quality Index setup module,
Non-linear Optimal Model establishes module and scheme output module；
The initialization module be used for determine NGEO satellite communication system constellation configuration and terrestrial user type and distribution feelings
Condition, while more than one satellite antenna is provided on each NGEO telecommunication satellite；
Antenna method is used to select the method for antenna on variable description NGEO satellite communication system star to orientation describing module on the star
To orientation；Wherein, the Variable Selection in the normal direction orientation of antenna on NGEO satellite communication system star is described are as follows: with satellite and ground
The line of the heart is axis, and the normal direction orientation of phased array antenna describes θ=[θ with two degree of angular freedoms on star1,θ2]T, θ1For angle freedom
Degree 1, θ2For degree of angular freedom 2；And the relationship of phased array antenna normal direction orientation adjustment and time are described with time variable t；
The annoyance level setup measures module is provided according to the interference protection about GEO satellite system of ITU, selects one group of weighing apparatus
Satellite communication system is measured to the index α of GEO satellite system interference degree；
Requirement of the Link Quality Index setup module according to satellite communication system to self communication quality, determines one group of measurement
The index β of satellite communication system link-quality；
The Non-linear Optimal Model establishes module and establishes the non-linear of phased array antenna normal direction orientation according to index α and index β
Optimized model；The Non-linear Optimal Model in phased array antenna normal direction orientation are as follows: optimized variable: θ (t)；
Objective function: max { β }；
Constraint condition: αi≤αith, i=1 ..., n；
The scheme output module exports a set of optimal phased array antenna deflection and is directed toward setting by iterative solution optimized variable
Scheme.
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