CN106656301B - Relay selection method based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio - Google Patents

Relay selection method based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio Download PDF

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CN106656301B
CN106656301B CN201611261492.5A CN201611261492A CN106656301B CN 106656301 B CN106656301 B CN 106656301B CN 201611261492 A CN201611261492 A CN 201611261492A CN 106656301 B CN106656301 B CN 106656301B
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relay
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CN106656301A (en
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李勇朝
穆文静
郭颖
阮玉晗
张锐
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay

Abstract

The invention proposes a kind of relay selection methods based on orbit information auxiliary optimum weighting signal-to-noise ratio, for solving existing relay selection method, there are the technical problems that overhead is big and relay node fair is low, it realizes that step includes: one primary of selection from multimedia LEO satellite communications, and obtains itself and earth station's call duration time；Satellite relay is screened according to primary call duration time alternatively to gather；Initialization satellite relay alternatively gather in each satellite revenue function；According to satellite-orbit information calculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio of earth station；The weighted factor of each satellite in the alternative relay collection of satellite is calculated according to revenue function；Weighted signal-to-noise ratio is calculated according to receiving end signal-to-noise ratio and weighted factor, selects the maximum satellite of weighted signal-to-noise ratio as repeater satellite.The present invention reduces overhead while guaranteeing transmission performance, improves the fair of relay node.

Description

Relay selection method based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio
Technical field
The invention belongs to fields of communication technology, are related to a kind of based in satellite-orbit information auxiliary optimum weighting signal-to-noise ratio After selection method, can be used in low orbit satellite collaboration communication.
Background technique
Collaboration communication is to anti-fading effective way, and the scene being most widely used is 3 points of classical relaying moulds Type, including source node, relay node and destination node, transmission process can be divided into two stages, first stage, source node Broadcast data, second stage, only relay node sends data to destination node.In recent years, multimedia LEO satellite communications are due to networking Flexibly, the features such as running track is low, and satellite-ground link propagation delay time is smaller causes the extensive concern of scholars.But satellite-ground link is deposited Deep fading be always one of the factor for restricting satellite communication development, and cooperative communication technology can be very good to anti-ageing It falls, therefore scholars' recent years start to consider for cooperation technology to be applied in satellite communication, according to the class of selecting collaboration object Type is divided into two major classes: star ground collaboration communication between collaboration communication and star, culminant star collaboration communication be source node be satellite, relaying section Point is earth station, destination node earth station, and it is satellite that collaboration communication, which is source node, between star, and relay node is satellite, destination node It is earth station.Current existing relay selection method is with concentrating on star in collaboration communication, and such as: S.Sreng was in ICC meeting in 2013 On propose a kind of maximum signal-to-noise ratio algorithm, choose and be relayed to the best relay node of destination node link-quality as relaying.Phase Comparison star ground collaboration communication, there are larger distances and high relative motion with destination node for collaboration communication relay node between star The characteristics of, lead between relay node and destination node channel there are feedback delay larger, Doppler effect is significant, in addition, defending Star also has the characteristics that energy constraint, these features can bring certain challenge to relay selection.Existing technology is assisted between star Communicate down can have the disadvantage that using instantaneous channel conditions information feedback can bring very big overhead；Frequently selection The node of best performance will lead to that node energy consumption is too fast, and the poor node of channel quality in system, due to by selection time Number is few, cannot effectively utilize, that is, relay node fair is low.
Summary of the invention
It is an object of the invention to overcome above-mentioned defect, propose a kind of best based on satellite-orbit information auxiliary The relay selection method of weighted signal-to-noise ratio, for solving, overhead existing for existing relay selection method is big and satellite relay section The low technical problem of point fair.
To achieve the above object, the technical solution that the present invention takes includes the following steps:
(1) primary is chosen from LEO satellite communication systems, and it is logical with earth station in 24 hours to obtain the primary The initial time t of letter0With end time t1；
(2) the initial time t of primary communication is utilized0With end time t1, choose LEO satellite communication systems in earth station Other satellites in addition to primary can be communicated, satellite relay is obtained and alternatively gathers, realize step are as follows:
(2a) in seconds, to primary communication initial time t0With end time t1It is rounded abbreviation, it is main after being rounded The initial time t of star communication0' and end time t1'；
(2b) obtains the initial time t of all satellite communications in addition to primary in LEO satellite communication systemsojWhen with terminating Carve t1j, wherein j=1,2,3 ... N, N are the numbers of other satellites in addition to primary in LEO satellite communication systems, while being with the second Unit, in LEO satellite communication systems in addition to primary all satellite communications initial time tojWith end time t1jIt is rounded Abbreviation, after being rounded in LEO satellite communication systems in addition to primary all satellite communications initial time toj' and terminate when Carve t1j'；
(2c) chooses the initiation of communication moment t of the satellite in addition to primaryoj' and end time t1j' in the communication of primary Begin moment t0' and end time t1' all satellites in the period, alternatively gather as satellite relay；
(3) system time t=t is initialized0', and initialize satellite relay alternatively gather in each satellite revenue function ui= 1, i=1,2,3 ..., n, wherein n is the number that satellite relay alternatively gathers Satellite；
(4) obtain system time t when primary and satellite relay alternatively gather in each satellite orbit information, and utilize these Orbit information calculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi, realize step are as follows:
(4a) in system time t, obtain respectively primary, satellite relay alternatively gather in each satellite and earth station longitude and latitude Spend coordinate, and calculate separately primary under cartesian coordinate system, satellite relay alternatively gather in each satellite and earth station coordinate；
(4b) according to the coordinate of primary, satellite relay under cartesian coordinate system alternatively gather in each satellite coordinate and ground The coordinate stood calculates separately primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to the distance of earth stationThe distance of each satellite in alternatively gathering with primary satellite relay
(4c) is according to primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to the distance of earth stationThe distance of each satellite in alternatively gathering with primary satellite relayPrimary is calculated separately to the path loss of earth station PLSD, satellite relay alternatively gather in each satellite to the path loss of earth stationIn alternatively gathering with primary satellite relay The path loss of each satellite
(4d) is according to primary to the path loss PL of earth stationSD, satellite relay alternatively gather in each satellite to earth station Path lossThe path loss of each satellite in alternatively gathering with primary satellite relayCalculate separately primary over the ground The receiving end average signal-to-noise ratio γ at face stationSD, satellite relay alternatively gather in each satellite to the receiving end average signal-to-noise ratio of earth stationThe receiving end average signal-to-noise ratio of each satellite in alternatively gathering with primary satellite relay
(4e) is according to primary to the receiving end average signal-to-noise ratio γ of earth stationSD, satellite relay alternatively gather in each satellite pair The receiving end average signal-to-noise ratio of earth stationThe receiving end of each satellite is averaged noise in alternatively gathering with primary satellite relay ThanCalculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi；
(5) revenue function u is utilizediCalculate satellite relay alternatively gather in each satellite weight factor wi；
(6) weighted signal-to-noise ratio w is calculatediγi, and choose weighted signal-to-noise ratio wiγiThe corresponding satellite of middle maximum value is as system Repeater satellite when moment t；
(7) when output system moment t repeater satellite number；
(8) judge whether system time t is greater than the end time t that primary is communicated with earth station1', if so, primary and ground Stand the initial time t communicated0' and end time t1' interior relay selection terminates, otherwise, update revenue functionWherein T0For primary communication time duration, p is this time to communicate The power of relay node consumption with season system time t=t+1, and executes step (4).
Compared with prior art, the present invention having the advantage that
The present invention obtain satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio of earth station when, be that basis is defended Luck row orbit information counting statistics channel state information is realized, the feedback introduced using instantaneous channel conditions information is eliminated Mechanism reduces overhead；Simultaneously using satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio of earth station with Weight factor calculates weighted signal-to-noise ratio, by choosing the maximum satellite relay node of weighted signal-to-noise ratio as relaying, in selecting After when consider the transmission performance and fair of each satellite relay node simultaneously, improve the public affairs of satellite relay node Levelling.
Detailed description of the invention
Fig. 1 is implementation process block diagram of the invention；
Fig. 2 is the performance of BER comparison diagram of the present invention with the prior art；
Fig. 3 is the fair performance comparison figure of the present invention with the prior art.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail:
Referring to Fig.1, realization step of the invention are as follows:
Step 1: choosing a primary from LEO satellite communication systems, and obtain the primary in 24 hours and earth station The initial time t of communication0With end time t1；
Step 2: the initial time t communicated using primary0With end time t1, choose LEO satellite communication systems in ground Face station can communicate other satellites in addition to primary, obtain satellite relay and alternatively gather, and realize step are as follows:
Step 2a: in seconds, to the initial time t of primary communication0With end time t1It is rounded abbreviation, is rounded The initial time t of primary communication afterwards0' and end time t1'；
Step 2b: the initial time t of all satellite communications in addition to primary in LEO satellite communication systems is obtainedojAnd termination Moment t1j, wherein j=1,2,3 ... N, N are the numbers of other satellites in addition to primary in LEO satellite communication systems, while with the second For unit, in LEO satellite communication systems in addition to primary all satellite communications initial time tojWith end time t1jIt takes Integralization letter, after being rounded in LEO satellite communication systems in addition to primary all satellite communications initial time toj' and terminate Moment t1j'；
Step 2c: the initiation of communication moment t of the satellite in addition to primary is chosenoj' and end time t1j' in the logical of primary Believe initial time t0' and end time t1' all satellites in the period, alternatively gather as satellite relay；
Step 3: initialization system time t=t0', and initialize satellite relay alternatively gather in each satellite revenue function ui=1, i=1,2,3 ..., n, wherein n is the number that satellite relay alternatively gathers Satellite；
Step 4: when obtaining system time t primary and satellite relay alternatively gather in each satellite orbit information, and utilize These orbit informations calculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi, realize step are as follows:
Step 4a: in system time t, obtain respectively primary, satellite relay alternatively gather in each satellite and earth station Latitude and longitude coordinates, and calculate separately primary under cartesian coordinate system, satellite relay alternatively gather in each satellite and earth station seat Mark, its calculation formula is:
xs=(R+h) cos θSlat cosθSlon
ys=(R+h) cos θSlat sinθSlon
zs=(R+h) sin θSlat
xD=Rcos θglat cosθglon
yD=Rcos θglat sinθglon
zD=Rsin θglat
Wherein, (θSlon,θSlat) be primary latitude and longitude coordinates, (θglon,θglat) be earth station latitude and longitude coordinates,It is the latitude and longitude coordinates of each satellite during satellite relay is alternatively gathered, (xs,ys,zs) it is main under Cartesian coordinates Star coordinate,Be under cartesian coordinate system satellite relay alternatively gather in each satellite coordinate, (xD,yD,zD) it is flute The coordinate of earth station under karr coordinate system, R are earth radius, and h is the height of LEO satellite communication systems Satellite running track；
Step 4b: according to the coordinate of primary, satellite relay under cartesian coordinate system alternatively gather in each satellite coordinate and The coordinate of earth station calculates separately primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to earth station DistanceThe distance of each satellite in alternatively gathering with primary satellite relayIts calculation formula is:
Step 4c: according to primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to earth station away from FromThe distance of each satellite in alternatively gathering with primary satellite relayPrimary is calculated separately to damage the path of earth station Consume PLSD, satellite relay alternatively gather in each satellite to the path loss of earth stationSatellite relay is alternatively gathered with primary In each satellite path lossIts calculation formula is:
Wherein, k in formula0It is a constant coefficient dependent on antenna performance and average channel loss, n0Refer to for path loss Number calculatesWhen no=2, calculateAnd PLSDWhen n0=2.5, d0For reference distance, d in this method0=1km；
Step 4d: according to primary to the path loss PL of earth stationSD, satellite relay alternatively gather in each satellite to earth station Path lossThe path loss of each satellite in alternatively gathering with primary satellite relayCalculate separately primary pair The receiving end average signal-to-noise ratio γ of earth stationSD, satellite relay alternatively gather in each satellite be averaged noise to the receiving end of earth station ThanThe receiving end average signal-to-noise ratio of each satellite in alternatively gathering with primary satellite relayIts calculation formula is:
γSD=EIRP+G/T-PLSD-PN
Wherein, EIRP indicates the effective omnidirectional radiation power of transmitting terminal, and G/T indicates the quality factor of receiving end, and PN is indicated Noise power-value, PN calculation formula:
PN=10log (k × B)
Wherein, k is Boltzmann constant, and B is equivalent noise bandwidth；
Step 4e: according to primary to the receiving end average signal-to-noise ratio γ of earth stationSD, satellite relay alternatively gather in each satellite To the receiving end average signal-to-noise ratio of earth stationThe receiving end of each satellite is averagely believed in alternatively gathering with primary satellite relay It makes an uproar ratioCalculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi, its calculation formula is:
Step 5: utilizing revenue function uiCalculate satellite relay alternatively gather in each satellite weight factor wi, calculate public Formula are as follows:
wi=ui -α
Wherein, α is normal amount, by simulating, verifying, α=4 in this method；
Step 6: calculating weighted signal-to-noise ratio wiγi, and choose weighted signal-to-noise ratio wiγiThe corresponding satellite conduct of middle maximum value Repeater satellite when system time t；
Step 7: the number of repeater satellite when output system moment t；
Step 8: judging whether system time t is greater than the end time t that primary is communicated with earth station1', if so, primary with The initial time t of earth station's communication0' and end time t1' interior relay selection terminates, otherwise, update revenue function ui, with season System time t=t+1, and execute step (4), more new formula are as follows:
Wherein T0For primary communication time duration, p is the power of this communication relay node consumption.
From above step as can be seen that the number of satellite relay node cooperation is more, the energy of consumption is more, revenue function uiAlso bigger, weight factor wiIt can reduce therewith, the probability selected when subsequent relay selection constantly reduces, also It says, even if the channel quality of a satellite relay node is very good, after repeatedly being selected, the value of its revenue function will not Disconnected to increase, corresponding weight factor constantly reduces, and selects its probability that will reduce in later relay selection.For channel The excessively poor satellite relay node of quality, due to being never utilized, revenue function value is relatively small, corresponding weight factor Larger, in cooperation below, the probability selected will be continuously increased, and be realized within the period of primary communication whereby in satellite After each satellite in alternative set the fair of each relay node is realized by the approximately equal target of selection number.
Below in conjunction with emulation experiment, effect of the invention is described further:
Simulated conditions and content:
According to simulated conditions: choose satellite that the number in iridium communication system is 10 as primary and Beijing earth station into Row communication；The initial time and end time of satellite orbit simulation effect and each satellite communication time are provided according to STK software；System Command width 10MHz；Satellite-ground link channel fading model uses Rice channel, and inter-satellite link channel fading model is believed using Gauss Road；Earth station receives antenna gain 22.9dB/K, and cooperate satellite antenna gain 10dB/K, and simulation times are 1000000 times；Emulation Comparison scheme is the maximum snr method based on receiving end signal-to-noise ratio, using widely used Jain ' the s Index formula of industry Fair is measured, performance of BER and fair performance are emulated respectively, result such as Fig. 2 and Fig. 3 institute Show.
It is the performance of BER comparison diagram of the present invention with the prior art referring to Fig. 2, satellite effective omnidirectional's spoke when abscissa Power (Effective Isotropic Radiated Power, EIRP) is penetrated, unit is dBW, and ordinate is bit error rate.From In figure it will be seen that in performance of BER, maximum signal-to-noise ratio algorithm performance is better than this method, but performance difference very little, The method of the present invention is compared with maximum snr method performance decline about 5%.
It is the fair performance comparison figure of the present invention with the prior art referring to Fig. 3, relay selection method when abscissa Type, ordinate are fair sex index.From the figure we can see that in fair performance, the method for the present invention Performance is better than maximum snr method, can be obviously improved about 50%.
In conclusion method of the invention makes each satellite relay node in system while can guarantee approximate preferably performance Fair be maintained at a relatively high level.
For those skilled in the art, it can be made various corresponding according to above technical solution and design Change and modification, and all these change and modification should be construed as being included within the scope of protection of the claims of the present invention.

Claims (7)

1. a kind of relay selection method based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, the specific steps of which are as follows:
(1) primary is chosen from LEO satellite communication systems, and obtains what the primary communicated in 24 hours with earth station Initial time t0With end time t1；
(2) the initial time t of primary communication is utilized0With end time t1, choosing in LEO satellite communication systems can lead to earth station Believe other satellites in addition to primary, obtain satellite relay and alternatively gather, realizes step are as follows:
(2a) in seconds, to primary communication initial time t0With end time t1It is rounded abbreviation, primary is logical after being rounded The initial time t of letter0' and end time t1'；
(2b) obtains the initial time t of all satellite communications in addition to primary in LEO satellite communication systemsojWith end time t1j, Wherein j=1,2,3 ... N, N are the numbers of other satellites in addition to primary in LEO satellite communication systems, while in seconds, To in LEO satellite communication systems in addition to primary all satellite communications initial time tojWith end time t1jAbbreviation is rounded, After being rounded in LEO satellite communication systems in addition to primary all satellite communications initial time toj' and end time t1j'；
(2c) chooses the initiation of communication moment t of the satellite in addition to primaryoj' and end time t1j' in the initiation of communication of primary Carve t0' and end time t1' all satellites in the period, alternatively gather as satellite relay；
(3) system time t=t is initialized0', and initialize satellite relay alternatively gather in each satellite revenue function ui=1, i =1,2,3 ..., n, wherein n is the number that satellite relay alternatively gathers Satellite；
(4) obtain system time t when primary and satellite relay alternatively gather in each satellite orbit information, and utilization these tracks Information calculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi, realize step are as follows:
(4a) in system time t, obtain respectively primary, satellite relay alternatively gather in each satellite and the longitude and latitude of earth station seat Mark, and calculate separately primary under cartesian coordinate system, satellite relay alternatively gather in each satellite and earth station coordinate；
(4b) according to the coordinate of primary, satellite relay under cartesian coordinate system alternatively gather in each satellite coordinate and earth station Coordinate calculates separately primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to the distance of earth station The distance of each satellite in alternatively gathering with primary satellite relay
(4c) is according to primary to the distance d of earth stationSD, satellite relay alternatively gather in each satellite to the distance of earth stationWith Primary satellite relay is alternatively gathered in each satellite distancePrimary is calculated separately to the path loss PL of earth stationSD, defend Path loss of each satellite to earth station in the alternative set of star relayingEach satellite in alternatively gathering with primary satellite relay Path loss
(4d) is according to primary to the path loss PL of earth stationSD, satellite relay alternatively gather in each satellite to the path of earth station LossThe path loss of each satellite in alternatively gathering with primary satellite relayPrimary is calculated separately to earth station Receiving end average signal-to-noise ratio γSD, satellite relay alternatively gather in each satellite to the receiving end average signal-to-noise ratio of earth station The receiving end average signal-to-noise ratio of each satellite in alternatively gathering with primary satellite relay
(4e) is according to primary to the receiving end average signal-to-noise ratio γ of earth stationSD, satellite relay alternatively gather in each satellite to ground The receiving end average signal-to-noise ratio stoodThe receiving end average signal-to-noise ratio of each satellite in alternatively gathering with primary satellite relayCalculate satellite relay alternatively gather in each satellite to the receiving end signal-to-noise ratio γ of earth stationi；
(5) revenue function u is utilizediCalculate satellite relay alternatively gather in each satellite weight factor wi；
(6) weighted signal-to-noise ratio w is calculatediγi, and choose weighted signal-to-noise ratio wiγiThe corresponding satellite of middle maximum value is as system time t When repeater satellite；
(7) when output system moment t repeater satellite number；
(8) judge whether system time t is greater than the end time t that primary is communicated with earth station1', if so, primary and earth station are logical The initial time t of letter0' and end time t1' interior relay selection terminates, otherwise, update revenue function ui,Wherein T0For primary communication time duration, p is this communication relay The power of node consumption with season system time t=t+1, and executes step (4).
2. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, Be characterized in that during calculating separately primary under cartesian coordinate system, satellite relay described in step (4a) alternatively gathers each satellite and The coordinate of earth station, its calculation formula is:
xs=(R+h) cos θSlatcosθSlon
ys=(R+h) cos θSlatsinθSlon
zs=(R+h) sin θSlat
xD=Rcos θglatcosθglon
yD=Rcos θglatsinθglon
zD=Rsin θglat
Wherein, (θSlon,θSlat) be primary latitude and longitude coordinates, (θglon,θglat) be earth station latitude and longitude coordinates,It is the latitude and longitude coordinates of each satellite during satellite relay is alternatively gathered, (xs,ys,zs) it is main under Cartesian coordinates Star coordinate,Be under cartesian coordinate system satellite relay alternatively gather in each satellite coordinate, (xD,yD,zD) it is flute The coordinate of earth station under karr coordinate system, R are earth radius, and h is the height of LEO satellite communication systems Satellite running track.
3. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, It is characterized in that the distance of each satellite during calculating primary described in step (4b) alternatively gathers satellite relayPrimary is over the ground The distance d at face stationSDDistance of each satellite to earth station in alternatively gathering with satellite relayIts calculation formula is:
。
4. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, It is characterized in that calculating primary is to the path loss PL of earth station described in step (4c)SD, satellite relay alternatively gather in respectively defend Path loss of the star to earth stationThe path loss of each satellite in alternatively gathering with primary satellite relayIt is counted Calculate formula are as follows:
Wherein, k in formula0It is a constant coefficient dependent on antenna performance and average channel loss, n0For path loss index, d0 For reference distance.
5. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, It is characterized in that calculating primary is to the receiving end average signal-to-noise ratio γ of earth station described in step (4d)SD, satellite relay alternative collection Receiving end average signal-to-noise ratio of each satellite to earth station in conjunctionEach satellite connects in alternatively gathering with primary satellite relay Receiving end average signal-to-noise ratioIts calculation formula is:
γSD=EIRP+G/T-PLSD-PN
Wherein, EIRP indicates the effective omnidirectional radiation power of transmitting terminal, and G/T indicates the quality factor of receiving end, and PN indicates noise Performance number, PN calculation formula:
PN=10log (k × B)
Wherein, k is Boltzmann constant, and B is equivalent noise bandwidth.
6. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, It is characterized in that each satellite is to the receiving end signal-to-noise ratio of earth station during calculating satellite relay described in step (4e) alternatively gathers γi, its calculation formula is:。
7. the relay selection method according to claim 1 based on satellite-orbit information auxiliary optimum weighting signal-to-noise ratio, It is characterized in that utilizing revenue function u described in step (5)iCalculate satellite relay alternatively gather in each satellite weight factor wi, Its calculation formula is:
wi=ui -α
Wherein, α is normal amount.
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