EP3881439A1 - Procédé et système d'estimation des atténuations des liens montants respectifs de station(s) d'accès satellitaire nominale(s) à un satellite de télécommunications à très haut débit vhts - Google Patents
Procédé et système d'estimation des atténuations des liens montants respectifs de station(s) d'accès satellitaire nominale(s) à un satellite de télécommunications à très haut débit vhtsInfo
- Publication number
- EP3881439A1 EP3881439A1 EP19789993.3A EP19789993A EP3881439A1 EP 3881439 A1 EP3881439 A1 EP 3881439A1 EP 19789993 A EP19789993 A EP 19789993A EP 3881439 A1 EP3881439 A1 EP 3881439A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- satellite
- high speed
- gwn
- nominal
- uplink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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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
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- 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
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
- H04B7/18526—Arrangements for data linking, networking or transporting, or for controlling an end to end session
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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
- H04B7/204—Multiple access
- H04B7/2041—Spot beam multiple access
Definitions
- the present invention relates to a method for estimating the attenuations of the respective first uplinks of very high speed telecommunications between a set of first nominal satellite access station (s) GWn and the same telecommunications satellite.
- VHTS very high speed in English “Very High Throughput Satellite” which allow to predict switching times for very high speed data traffic to be carried out from at least one nominal satellite access station of the whole of the first GWn nominal satellite access station (s) to at least one second GWp diversity satellite access station via corresponding second RF uplink link (s) attached to the same VHTS satellite.
- the present invention also relates to a method for predicting the switching times of very high speed data traffic to be performed by a very high speed VHTS space telecommunications system, the VHTS space telecommunications system including the VHTS satellite and at least a first and at least a second access station, GWn, GWp and the method for predicting switching instants using the method according to the invention for estimating the attenuations of the first uplink link (s) ) telecommunications RF radio frequency.
- the present invention also relates to a VHTS very high speed satellite space communication system (s), configured to implement said method for estimating the attenuations of the first nominal VHTS uplinks and the method for predicting traffic switching times. from at least one nominal RF VHTS uplink to at least one second diversity VHTS RF uplink.
- VHTS very high speed satellite space communication system s
- VHTS very high speed telecommunications systems are characterized by very large telecommunications capacities.
- the use of very high frequency Q / V bands, or even other higher bands such as for example the W band is a major advantage because these allow to significantly increase the width of band allocated by access station and therefore the speed of the data traffic carried.
- RF station redundancy For example, a first technique, called “RF station redundancy”, illustrated in Figure 1, allows the implementation of a strategy managing spatial or geographic diversity, and a second technique called “flexible or intelligent diversity” (in English “Smart diversity”), illustrated in FIG. 2, allows the implementation of a strategy managing the diversity of traffic loads.
- RF station redundancy For example, a first technique, called “RF station redundancy”, illustrated in Figure 1, allows the implementation of a strategy managing spatial or geographic diversity, and a second technique called “flexible or intelligent diversity” (in English “Smart diversity”), illustrated in FIG. 2, allows the implementation of a strategy managing the diversity of traffic loads.
- These diversity techniques all use a method for predicting the switching times of very high speed data traffic between at least a first uplink of nominal traffic and at least a second uplink of diversity traffic, the first uplink. nominal being configured to route very high speed data traffic from a first nominal satellite access station to a very high speed VFITS satellite, and the second diversity uplink being configured to carry very high speed data traffic from a second diversity satellite access station to the same very high speed VFITS satellite.
- the method for predicting the switching times of VHTS data traffic is configured and used to:
- triggering traffic or traffic load switchovers in English “handover” of the user service terminals from a first station charged satellite access to at least a second diversity satellite access station which is not in the rain and which is capable of managing part or all of the load of the first access station within the framework of a intelligent load diversity management.
- a first technique is based on a forecast of the meteorological environment and uses weather forecast models.
- This first technique presents a good window of anticipation, typically of a duration of between one hour and six hours, but provides an estimate, bad and rough, of the attenuations of the uplinks of traffic of the satellite access stations by allowing only a discrimination between a rainy environment and a clear sky environment.
- the operational implementation of this first technique is difficult because access by satellite access stations to an auxiliary telecommunications network, connected to databases of meteorological observations, is necessary, and because the availability of meteorological data in certain geographic areas, including Europe, is not always guaranteed.
- a second technique is based on an estimation of the attenuations of the uplinks of traffic of the satellite access stations through measurements by each satellite access station of a downlink RF beacon in Ka band, transmitted by the satellite in a satellite spot. global broadcast or in a local broadcast satellite spot, different by satellite access station.
- This second technique provides estimates of the uplink attenuations of the access stations. more precise than those provided by the first prediction technique.
- this second technique presents a window of anticipation which is shorter than that presented by the first technique, but which remains compatible with an additional high-speed link of remote controls, sometimes designated by "Hilink" and distinct from the conventional link. remote controls and telemetry (TM / TC) from a satellite.
- the duration of the anticipation window, presented by the second prediction technique is equal to 5 minutes.
- this technique requires the addition of additional on-board equipment for generating a beacon and an omnidirectional antenna in the event of global coverage, and even if this second prediction technique improves the accuracy of the estimation of uplink attenuations of satellite access stations, a significant error varying from 1 to 2 dB vitiates the estimation of uplink attenuation of V-band traffic when the current beacon transmitter is continued which operates in Ka band. Indeed, the absence of sufficient knowledge concerning the correlation of the laws of attenuation of the propagation modes of the radio signals in V band and in Ka band makes it difficult to transpose an estimator of the attenuation in Ka band for an attenuation in band. V without notable error.
- the first and second techniques for predicting uplink attenuations of the satellite access stations described above do not fully satisfy the requirements of VHTS telecommunications systems.
- a first technical problem which the invention solves is to increase the precision, the reliability and the robustness of a method for estimating the attenuations of the respective uplinks of very high speed telecommunications between a first nominal satellite access station GWn and a VHTS very high speed telecommunications satellite, and between a second diversity GWp satellite access station to the same VHTS satellite, while limiting the additions and additional modifications of equipment, necessary to achieve this diversity and generating a cost additional.
- a second technical problem, related to the second problem and which the invention solves, is to provide a reliable and robust prediction method for the switching times of very high speed data traffic between a first nominal satellite access station GWn nominal serving and a second GWp satellite access station of diversity while limiting the additions and additional modifications of equipment, necessary to achieve this diversity and generating an additional cost.
- the subject of the invention is a method for estimating, at a given time, a set of attenuations of one or more first uplink RF radio link (s) of very high speed telecommunications connecting one or more several first nominal satellite access stations to the same VHTS very high speed telecommunications satellite.
- the method for estimating all the attenuations of the first uplink RF radio frequency link (s) is implemented by a VFITS space telecommunications system comprising:
- first nominal satellite access stations GWn (i), i being a first index varying from 1 to N;
- each first nominal satellite access station GWn having a first uplink of traffic LUn (i) at very high speed operating in a uplink transmission band and, associated, a first very high speed LDn (i) traffic downlink operating in Q band.
- the VHTS space communications satellite has a payload having:
- an antenna system for generating reception and transmission satellite spots associated with the first (s) and second (s) access stations and transmission and reception spots associated with the user terminals
- a transparent DTP or regenerative digital processing processor configured mainly to provide high degree connectivity and flexibility of high degree of allocation of frequency slots to the reception and transmission satellite spots of the first and second stations access and transmission and reception satellite spots from user terminals.
- the digital processing processor generates a common beacon signal or several different beacon signals and distributes it (s) via a number S of Q band emission satellite spots, greater than or equal to 1 and less than or equal to N, to N first downlink RF radio link (s) LDn (i), i varying from 1 to N, to be measured in power, or
- the digital processing processor measures for each first uplink LUn (i, i varying from 1 to N, a spectral power of the very high speed traffic signal received by the satellite corresponding to the traffic signal transmitted by the first radio station corresponding nominal GWn (i) satellite access;
- the method for estimating at a given time, a set of attenuation levels of one or more first uplink RF uplink (s) of very high speed telecommunications connecting a or several first nominal satellite access stations to the same very high speed telecommunications satellite VFITS includes one or more of the following characteristics, taken individually or in combination: the estimation method comprises according to a first type of estimation: a first first step in which the digital processing processor generates a common beacon signal or several different beacon signals, then a first second step in which the processing processor digital routes the beacon signal (s) generated to a set of base band or intermediate frequency band transmission chains, connected to the emission satellite spots of the first nominal satellite access stations GWn (i), i varying from 1 to N, through RF conversion chains to Q band at output; then a first third step in which a beacon signal, taken from the beacon signal or signals, generated and converted into band Q, is sent to each first satellite access station GWn (i), i varying from 1 to N, through the transmitting satellite spot and
- the digital processing processor reuses a multicast module (in English "multicast") to route the beacon signal (s) generated to the set of baseband or intermediate frequency band channels, connected to the spots satellite transmission of the first nominal satellite access stations through output RF to Q band conversion chains;
- the transmission band of the first uplinks of the first access stations is a band included in the Ka band and the V band;
- the estimation method comprises according to a second type of estimation: a second first step in which each first satellite access station GWn (i), i varying from 1 to N, transmits a signal to the VFITS satellite (204) different data traffic on its first uplink LUn (i); then a second second step in which the digital processing processor measures for each first link uplink LUn (i), i varying from 1 to N, a spectral power of the very high speed traffic signal sent by the corresponding first nominal satellite access station GWn (i); then a second third step in which the digital processing processor transmits the measured spectral powers of the VHTS traffic signals to an uplink attenuation estimation calculator LUn (i), i varying from 1 to N, the estimation calculator being located on the ground or on board the satellite; then a second fourth step in which the attenuation estimation calculator estimates from each measured spectral power of the uplink traffic signal LUn (i), i varying from 1 to N, a corresponding attenuation level An (i);
- the on-board telemetry subsystem comprises only a first conventional low-speed telemetry device, including the platform telemetry and of the VHTS payload or comprises a first conventional low-speed telemetry device and a second auxiliary high-speed telemetry device (Hilink) dedicated to telemetry of the VHTS payload, the telemetry subsystem being configured to transmit the telemetry spectral powers to the estimation calculator, located on the ground, or the on-board telemetry subsystem comprises a first conventional low-speed telemetry device and a second auxiliary high-speed telemetry device (Hilink) dedicated to telemetry of the load useful VHTS, the second auxiliary device for high-speed telemetry including AC estimation calculator and being configured to transmit to the ground the attenuation levels A (i) calculated from the uplinks LUn (i), i varying from 1 to N.
- the subject of the invention is also a method of predicting the switching times of a VHTS very high speed data traffic of a set of at least one nominal satellite access station (s). to at least one diversity satellite access satellite station, the method for predicting switching times for very high speed VHTS data traffic from switching times for very high speed VHTS data traffic from a set of nominal satellite access stations being implemented by a VHTS very high speed space telecommunications system comprising: a VHTS very high speed telecommunications satellite; a predetermined integer N, greater than or equal to 1, of first nominal satellite access station (s) GWn (i), i being a first index varying from 1 to N, and a predetermined number P , greater than or equal to 1, of second satellite access station (s) of diversity GWp (j), j being a second index varying from 1 to P; and a plurality of user terminals; and a space telecommunications system control and coordination station, configured to manage diversity; each first nominal satellite access station GWn (i) having a
- the method of predicting the switching times of very high speed data traffic from a set of nominal satellite access stations to at least one station diversity satellite access satellite is characterized in that it comprises: a step of estimation, at a succession of given times tk, for each instant tk of the attenuation level Ank (i) of each first station of nominal satellite access GWn (i), i varying from 1 to N, the step of estimating the attenuation levels Ank (i) of the uplinks LUn (i) at the same instant tk being defined above, then a step of determining the switching instants of a very high speed data traffic from the set of nominal satellite access stations GWn (i), i varying from 1 to N, in which it is decided at each instant tk and for each nominal satellite access station GWn ( i), i varying from 1 to N, whether or not to switch the data traffic as a function of the attenuation level Ank (i) estimated at time tk of the uplink LUn (i) of said first
- the method for predicting the switching times of very high speed VHTS data traffic of a set of at least one nominal satellite access station (s) to at least one diversity satellite access satellite station comprises one or more of the following characteristics, taken individually or in combination:
- the switching instant tc (iO) is then an instant delayed with respect to the instant tkO of a delay compatible with the duration of the implementation of the diversity with respect to the nominal satellite access station GWn (iO).
- the subject of the invention is also a very high speed space telecommunications system for estimating, at the same given time, a set of attenuation levels of one or more first uplink RF radio communication link (s). at very high speed connecting one or more first nominal satellite access station (s) to the same VHTS very high speed telecommunications satellite, comprising: a VHTS very high speed telecommunications satellite ; a predetermined integer N, greater than or equal to 1, of first nominal satellite access stations GWn (i), i being a first index varying from 1 to N; and a plurality of user terminals, and a control and coordination station of the space telecommunications system, configured to manage diversity; each first nominal satellite access station GWn (i) having a first uplink of traffic LUn (i) at very high speed operating in an uplink transmission band and, associated, a first downlink of traffic LDn (i) to very high speed operating in Q band; and the VHTS telecommunications satellite comprising a payload having: an antenna system
- the VHTS very high-speed space telecommunications system is characterized in that the digital processing processor is configured to generate a common beacon signal or several different beacon signals and distributes it (s) via a number S of satellite broadcast spots in band Q, greater than or equal to 1 and less than or equal to N, at the first N downlink RF radio frequency links LDn (i), i varying from 1 to N, to be measured in power, or the digital processing processor is configured to measure for each first nominal satellite access station GWn (i), i varying from 1 to N, a spectral power of the very high speed traffic signal transmitted on the first associated uplink LUn (i).
- the VHTS very high-speed space telecommunications system comprises one or more of the following characteristics, taken individually or in combination:
- the digital processing processor is configured to generate in a first first step a common beacon signal or several different beacon signals, then in a first second step to route the beacon signal or signals generated to a set of transmission chains in baseband or intermediate frequency band, connected to the emission satellite spots of the first nominal satellite access stations GWn (i), i varying from 1 to N, through RF conversion channels to Q band at output; and the antenna system for generating reception and transmission satellite spots associated with the first nominal access station (s) is configured to send in a first third step a beacon signal, taken from the beacon or signals, generated and converted into band Q, at each first satellite access station GWn (i), i varying from 1 to N, through the transmitting satellite spot and the first downlink LD (i) of said first nominal satellite access station GWn (i); and every first satellite access station GWn (i), i varying from 1 to N, is configured to measure with precision in a first fourth step the power of the beacon signal emitted by the satellite on its downlink LDn (i), and in deduc
- each first satellite access station GWn (i), i varying from 1 to N is configured in a second first step to transmit to the VHTS satellite a different data traffic signal on its first uplink LUn (i); and the digital processing processor is configured to: measure in a second second step, consecutive to the first step, for each first uplink LUn (i), i varying from 1 to N, a spectral power of the traffic signal at very high throughput sent by the first nominal satellite access station GWn (i), then in a second third step transmit the measured spectral powers of the VHTS traffic signals to an uplink attenuation estimation calculator (266), located on the ground or on board the satellite, the attenuation estimation calculator being configured to estimate from each measured spectral power of the uplink traffic signal LUn (i), i varying from 1 to N, a level d 'corresponding attenuation An (i);
- the VHTS very high-speed telecommunications satellite includes an on-board telemetry subsystem, the on-board telemetry subsystem comprising only a first conventional low-speed telemetry device, including platform and VHTS payload telemetry or comprising a first conventional low-speed telemetry device and a second auxiliary high-speed telemetry device (Hilink) dedicated to telemetry of the VHTS payload, and the telemetry subsystem being configured to transmit telemetry of spectral powers to estimation calculator, located on the ground; or the on-board telemetry subsystem comprising a first conventional low-speed telemetry device and a second high-speed auxiliary telemetry device (Hilink) dedicated to VHTS payload telemetry, the second auxiliary speed telemetry device high including the estimation calculator and being configured to transmit to the ground the attenuation levels An (i) of the uplinks LUn (i), i varying from 1 to N;
- the VHTS very high-speed space telecommunications system defined above also comprises a predetermined number P, greater than or equal to 1, of second satellite access stations of diversity GWp (j), j being a second index varying from 1 to P; and the antenna system is configured to generate reception and transmission satellite spots associated with the first and second access stations GWn (i), GWp (j) and transmission and reception spots associated with the user terminals ; and the control and coordination station of the space telecommunications and diversity management system is configured to predict times of switching of very high speed data traffic from a set of nominal satellite access stations to the minus a diversity satellite access station by receiving the estimates, at a succession of given times tk, for each instant tk of the attenuation level Ank (i) of each first nominal satellite access station GWn (i), i varying from 1 to N, then determining the switching times for very high speed data traffic from the set of first nominal satellite access stations GWn (i), i varying from 1 to N, by deciding at each instant tk
- FIG. 1 is a general architectural view of a VHTS very high speed space telecommunications system which implements a first diversity technique, called "RF station redundancy" and forming part of the state of the art;
- - Figure 2 is general architectural of a very high speed VHTS space telecommunications system which implements a second diversity technique, called "flexible or intelligent diversity” and forming part of the state of the art
- - Figure 3 a general architectural view of a VHTS very high-speed space telecommunications system according to the invention for estimating at the same given time a set of attenuation levels of one or more first link (s) ) uplink RF radio frequency (s) of very high speed connecting one or more first nominal satellite access station (s) to the same VFITS very high speed telecommunications satellite;
- FIG. 4 is a general architectural view of the VFITS satellite used in the VHTS very high-speed space telecommunications system according to the invention of Figure 3;
- FIG. 5 an architectural and functional view of a first embodiment of the VHTS very high speed spatial telecommunications system of Figure 3;
- FIG. 6 is an architectural and functional view of a second embodiment of the VHTS very high speed space telecommunications system of Figure 3;
- FIG. 7 is a general flowchart of an estimation method according to the invention of estimation, at the same given time, of a set of attenuations of one or more first radiofrequency link (s) RF very high speed telecommunications uplinks connecting one or more first nominal satellite access station (s) GWn to the same VHTS very high speed telecommunications satellite;
- FIG. 8 is a detailed flowchart of a first embodiment of the estimation method of Figure 7;
- FIG. 9 is a detailed flowchart of a second embodiment of the estimation method of Figure 7;
- FIG. 10 is a general flowchart of a method for predicting the switching times of very high speed VHTS data traffic from a set of at least one nominal satellite access station to at least one station of diversity satellite access.
- the basic principle of the invention is based on the use of a transparent digital processor DTP (in English "Digital Transparent Processor") or regenerative to carry out, directly or indirectly, the power measurement of the access link amount of the ground station for access to the VHTS telecommunications satellite. It consists : - generate Q-band beacons on board the satellite to determine the attenuation on the uplink on the ground, or alternatively
- the measurement can be carried out on a subset of elementary bands at the rate of a few elementary bands per GW access station, and the elementary measurements forming a spectral analysis can then be sent to the ground to carry out the estimator. of the process or processed on board the satellite, for example by a high speed telemetry module, for example the module called on certain satellite systems by "hilink".
- a VHTS 2 very high-speed space telecommunications system is configured to estimate at the same given time a set of attenuation levels of one or more first uplink telecommunications RF radio link (s) at very high speed connecting one or more first nominal satellite access stations to the same VHTS very high speed telecommunications satellite.
- the 2 VHTS telecommunications system includes:
- VHTS very high speed telecommunications satellite 4
- first nominal satellite access stations 6 GWn (i), i being a first index varying from 1 to N;
- a station 16 for controlling and coordinating the space telecommunications system 2 configured to manage diversity
- a single first nominal satellite access station is illustrated and designated by the numerical reference 6 or GWn (i), i designating a first generic index of the route of all the first nominal satellite access stations.
- a single second diversity satellite access station is illustrated and designated by the reference numeral 18 or GWp (j), j designating a second generic index of the set of second diversity satellite access stations.
- Each first nominal satellite access station Gn (i), i varying from 1 to N, comprises a first uplink of very high speed traffic, designated by LUn (i) and by the reference 26 in FIG. 3, and operating in an uplink broadcast band.
- the first very high speed traffic uplink LUn (i) is associated with a first very high speed traffic downlink LDn (i) operating in Q band.
- the VFITS space communications satellite 4 comprises a payload 52 having:
- a digital processing processor here transparent 62 DTP (in English “Digital Transparent Processor”), configured mainly to provide high degree connectivity and flexibility of high degree of allocation of frequency slots to the satellite spots receiving and transmitting first nominal access station (s) and second diversity access station (s), and to the transmission and reception satellite spots of user terminals.
- the transparent digital processing processor 62 DTP is configured to generate a common beacon signal or several different beacon signals and distributes it (them) via a number S of satellite spots transmitting in Q band, greater than or equal to 1 and less than or equal to N, to the first N downlink RF radiofrequency links LDn (i), i varying from 1 to N, to be measured in power, or the transparent digital processing processor 62 DTP is configured to measure by each first nominal satellite access station GWn (i), i varying from 1 to N, a spectral power of the very high speed traffic signal of the first uplink LUn (i) associated.
- the transparent digital processing processor DTP 62 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- the VHTS telecommunications satellite 4 is a 104 VHTS telecommunications satellite in which the digital processing processor 62 DTP is a transparent digital processor 162 DTP, configured to generate in a first step a common beacon signal or several different beacon signals, then in a second step to route the generated beacon signal (s) to a set 164 of broadcast channels in baseband or in intermediate frequency band, connected to the satellite transmitting spots of the first nominal satellite access stations through 166 RF to Q band output conversion chains.
- the digital processing processor 62 DTP is a transparent digital processor 162 DTP, configured to generate in a first step a common beacon signal or several different beacon signals, then in a second step to route the generated beacon signal (s) to a set 164 of broadcast channels in baseband or in intermediate frequency band, connected to the satellite transmitting spots of the first nominal satellite access stations through 166 RF to Q band output conversion chains.
- the antenna system 54, 56 for generating reception and transmission satellite spots associated with the first nominal access station (s) is configured to send in a third step a beacon signal, taken from the beacon or signals, generated and converted into band Q, at each first satellite access station GWn (i), i varying from 1 to N, through the transmitting satellite spot and the first downlink LD (i) of said first nominal satellite access station GWn (i); and
- each first satellite access station GWn (i), i varying from 1 to N is configured to measure with precision in a fourth step the signal strength of beacon emitted by the satellite on its downlink, and deduce therefrom the attenuation in band Q of the first downlink, and then determine by a predetermined statistical correlation process a level of attenuation An (i) of the first corresponding uplink LUn ( i) in the uplink transmit band.
- the digital processing processor 162 DTP is configured to generate in the first step a common beacon signal, then in a second step route the generated beacon signal to all 164 of the transmission channels in baseband or in intermediate frequency band, connected to the emission satellite spots of the first nominal satellite access stations GWn (i) through the conversion chains 166 RF into Q band in exit.
- the digital processing processor 162 DTP is configured to generate in the first step several different beacon signals, then in a second step route the beacon signals generated to all 164 of the baseband broadcast channels or in the intermediate frequency band, connected to the satellite transmitting spots of the first nominal satellite access stations GWn (i) through 166 RF to Q band output conversion chains.
- the different beacon signals generated are distributed, before transposition into the RF output Q band, in elementary sub-bands of the base band or of the intermediate frequency band, the most distant from each other, for example in band edges and mid-band when three different beacon signals are generated. This minimizes frequency similarity errors.
- the values of the frequencies of the different beacon signals generated may vary over time during the transmission service in a programmed manner, and be modified by remote controls more generally during the mission.
- the transparent digital processing processor DTP 162 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- each first satellite access station GWn (i), i varying from 1 to N, is configured in a first step transmit to the VFITS satellite has a different data traffic signal on its first uplink.
- the VHTS 4 communications satellite is a VHTS 204 communications satellite in which the transparent digital processing processor 62 is a DTP transparent digital processing processor 262 configured for: - measure in a second step, consecutive to the first step, for each first uplink Lun (i), i varying from 1 to N, a spectral power of the very high speed traffic signal sent by the first satellite access station nominal GWn (i), through the antenna system 54 and a set 264 of RF reception and of conversion into baseband or into intermediate frequency band; then
- the attenuation estimation calculator transmitting in a third step the measured spectral powers of the VHTS traffic signals to an uplink attenuation estimation calculator, located on the ground or on board the satellite, the attenuation estimation calculator being configured to estimate at from each measured spectral power of the traffic signal of an uplink LUn (i), i varying from 1 to N, a corresponding attenuation level A (i).
- the calculator for estimating the uplink attenuations of the uplinks LUn (i), i varying from 1 to N, designated by the reference numeral 266 is assumed to be on board the satellite 204.
- the calculator d The uplink attenuation estimate LU (i) is located on the ground in the control and coordination station 16 of the space telecommunications system 2, configured in particular to manage diversity.
- the very high speed telecommunications satellite VFITS 204 comprises an on-board telemetry subsystem 268.
- the on-board telemetry subsystem comprises a first conventional low-speed telemetry device 270 and a second high-speed telemetry auxiliary device 272 (Hilink), dedicated to VFITS payload telemetry, the second auxiliary telemetry device 272 to high throughput including the attenuation estimation calculator 266 and being configured to transmit to the ground segment the attenuation levels An (i) of the uplinks LUn (i), i varying from 1 to N.
- Hilink high-speed telemetry auxiliary device 272
- the calculator for estimating the uplink attenuations LUn (i) is located on the ground, for example in the station 16 for controlling and coordinating the space telecommunications system 2.
- the telemetry subsystem 270 is configured to transmit telemetry of spectral powers to the estimation calculator located on the ground.
- the on-board telemetry subsystem may comprise only a first conventional low-speed telemetry device, including the VHTS platform and payload telemetry or comprise a first conventional low-speed telemetry device and a second Auxiliary high speed telemetry device (Hilink) dedicated to VHTS payload telemetry.
- the transparent digital processing processor DTP 262 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- an estimation method 302 at the same given time, of a set of attenuations of one or more first uplink RF radio communications link (s) at very high broadband connecting one or more first nominal satellite access stations to the same very high speed VHTS telecommunications satellite, is implemented by the VHTS space telecommunications system of Figures 3 and 4.
- the attenuation estimation system 302 comprises an auxiliary operating step 304 of the transparent digital processing processor DTP 62, followed by a step 306 of determining the uplink attenuations LUn (i), i varying from 1 to N, of the first nominal satellite access stations GWn (i).
- the transparent digital processing processor DTP 62 In the auxiliary operating step 304 of the transparent digital processing processor DTP 62, the transparent digital processing processor DTP 62 generates a common beacon signal or several different beacon signals and distributes it (them) via a number S of spots satellite transmission in Q band, greater than or equal to 1 and less than or equal to N, at the first N downlink RF radio frequency links LDn (i), to be measured in power, or the transparent digital processing processor DTP 62 measures for each first uplink LUn (i), i varying from 1 to N, a spectral power of the very high speed traffic signal, transmitted by the corresponding first nominal satellite access station GWn (i).
- the attenuation levels An (i) of the uplinks LUn (i) of the links rising LUn (i), i varying from 1 to N, corresponding to the first nominal access stations GWn (i), are determined from measurements of the powers received on the ground of the beacon (s) emitted by the transparent digital processor DTP 62 , or from, for each first uplink LUn (i), i varying from 1 to N, from the spectral power of the very high speed traffic signal transmitted by the corresponding corresponding nominal first satellite access station GWn (i).
- the transparent digital processing processor DTP 62 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- an estimation method 352 at the same given time, of a set of attenuations of one or more first link (s) uplink telecommunications radio frequency at very high speed, is implemented by the space telecommunications system of Figure 5.
- the attenuation estimation method 352 comprises a first set of steps executed successively.
- a first first step 354 the digital processing processor DTP 162 generates a common beacon signal or several different beacon signals.
- the transparent digital processing processor DTP 162 routes the beacon signal or signals generated to a set of chains of baseband or intermediate frequency band transmissions, connected to the satellite spots transmitting the first nominal satellite access stations GWn (i) through output RF to Q band conversion chains.
- a beacon signal taken from the beacon signal or signals, generated and converted into the Q band, is sent to each first satellite access station GWn (i), i varying from 1 to N , through the transmitting satellite spot and the first downlink LDn (i) of said first nominal satellite access station GWn (i).
- each first satellite access station GWn (i), i varying from 1 to N measures with precision the power of the beacon signal emitted by the satellite on its downlink LDn (i), deduces therefrom the Q-band attenuation of the first downlink LDn (i), and then determines by a conventional statistical method of predetermined correlation a level of attenuation An (i) of the first corresponding uplink LUn (i) in the uplink transmission band.
- the transparent digital processing processor DTP 162 reuses a multicast module (in English "multicast") to route the beacon signal or signals generated towards the set of baseband or intermediate frequency band emission channels, connected to the emission satellite spots of the first nominal satellite access stations through RF conversion channels to Q band at output.
- a multicast module in English "multicast"
- the transmission band of the first uplinks of the first access stations is a band included in the Ka band and the V band.
- the transparent digital digital processing processor DTP 162 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- an estimation method 402 at the same given time, of a set of attenuations of one or more first link (s) Uplink very high speed telecommunications radio frequency according to claim 1, is set by the space telecommunications system of Figure 6.
- the attenuation estimation method 402 comprises a second set of steps executed successively.
- the transparent digital processing processor DTP 262 measures for each first uplink LUn (i), i varying from 1 to N, a spectral power of the signal very high speed traffic sent by the first corresponding nominal satellite access station GWn (i).
- the DTP digital processing processor 162 transmits the measured spectral powers of the VHTS traffic signals to an estimation computer 266 of the uplink attenuations, located on the ground or on board the satellite.
- the attenuation estimation calculator 266 estimates from each measured spectral power of the uplink traffic signal LUn (i), i varying from 1 to N, a level of attenuation corresponding An (i).
- the measured spectral powers are for example recovered cyclically at a low period, between 0.05 and 10 seconds, preferably between 0.1 and 1 seconds, by a telemetry subsystem of the on-board satellite.
- the telemetry subsystem on board the VHTS satellite comprises only a first conventional low-speed telemetry device, including the VHTS platform and payload telemetry, or comprises a first conventional low-speed telemetry device and a second auxiliary high-speed telemetry device (Hilink) dedicated to telemetry of the VHTS payload
- the telemetry subsystem transmits telemetry of spectral powers to the estimation computer, located on the ground.
- the telemetry subsystem on board the VHTS satellite comprises a first conventional low-speed telemetry device and a second auxiliary high-speed telemetry device (Hilink) dedicated to telemetry of the VHTS payload
- second high-speed telemetry auxiliary device including the estimation calculator transmits to the ground segment the attenuation levels A (i) of the uplinks LUn (i), i varying from 1 to N.
- the transparent digital processing processor DTP 262 can be replaced by a regenerative digital processing processor in which the telecommunications signals are demodulated.
- This second embodiment 402 of the method for estimating the attenuations of the first uplinks LUn (i), i varying from 1 to N, has the following three main advantages:
- the solution proposed in this second embodiment has no operational impact or limitation.
- a single defect or drawback is the fact of introducing latency, that is to say a propagation and transmission time.
- this latent is sufficiently low and remains compatible with the balance of preparation and execution time times for the switching.
- a method of predicting 502 the switching times of a VHTS very high speed data traffic from a set of at least one nominal satellite access station (s) to at least one diversity satellite access satellite station, implemented by a VHTS telecommunications system as described in one of Figures 3 to 5, comprises:
- an estimation step 504 at a succession of given times tk, for each instant tk of the attenuation level Ank (i) of each nominal satellite access station GWn (i), i varying from 1 to N, the step of estimating the attenuation levels Ank (i) of the uplinks LUn (i) at the same instant tk being one of the methods 203, 352, 402 described in the respective Figures 7, 8 and 9; and a step 506 of determining the switching instants of very high speed data traffic of the set of nominal satellite access stations GWn (i), i varying from 1 to N, executed successively, in which it is decided at each instant tk and for each satellite access station GWn (i), i varying from 1 to N, whether or not to switch the data traffic as a function of the attenuation level estimated at l instant tk of the uplink LUn (i) of said station GWn (i).
- the switching instant tc (i0) is then an instant delayed with respect to l instant tkO of a delay compatible with the duration of the implementation of the diversity with respect to the nominal satellite access station GWn (iO).
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1871837A FR3088783B1 (fr) | 2018-11-15 | 2018-11-15 | Procede et systeme d'estimation des attenuations des liens montants respectifs de station(s) d'acces satellitaire nominale(s) a un satellite de telecommunications a tres haut debit vhts |
| PCT/EP2019/078795 WO2020099077A1 (fr) | 2018-11-15 | 2019-10-23 | Procédé et système d'estimation des atténuations des liens montants respectifs de station(s) d'accès satellitaire nominale(s) à un satellite de télécommunications à très haut débit vhts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3881439A1 true EP3881439A1 (fr) | 2021-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| EP19789993.3A Pending EP3881439A1 (fr) | 2018-11-15 | 2019-10-23 | Procédé et système d'estimation des atténuations des liens montants respectifs de station(s) d'accès satellitaire nominale(s) à un satellite de télécommunications à très haut débit vhts |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11342967B2 (fr) |
| EP (1) | EP3881439A1 (fr) |
| CA (1) | CA3119698A1 (fr) |
| FR (1) | FR3088783B1 (fr) |
| WO (1) | WO2020099077A1 (fr) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2594264A (en) * | 2020-04-20 | 2021-10-27 | Res & Innovation Uk | Satellite communications system |
| CN112165351B (zh) * | 2020-08-28 | 2022-10-14 | 中国卫通集团股份有限公司 | 基于5g异构接入架构的hts信关站数据处理方法及系统 |
| CN116073893B (zh) * | 2023-04-06 | 2023-07-18 | 西安空间无线电技术研究所 | 标定多频段毫米波信号大气传输特性的载荷系统及方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3273703D1 (en) * | 1981-11-16 | 1986-11-13 | Nec Corp | Earth station transmission power control system |
| BR112012002668B1 (pt) | 2009-08-04 | 2020-10-20 | Telespazio S.P.A | sistema para monitorar e controlar um sistema de transmissão televisiva via satélite |
| US8843059B2 (en) * | 2011-10-31 | 2014-09-23 | Hughes Network Systems, Llc | System and method for gateway RF diversity using a configurable spot beam satellite |
| PT3079612T (pt) | 2013-12-09 | 2020-07-16 | Acumed Llc | Sistema de fixação de anca compatível à base de hastes |
| WO2017109955A1 (fr) * | 2015-12-25 | 2017-06-29 | 三菱電機株式会社 | Satellite de communication, appareil de commande de ligne, et système de communication par satellite |
| DK3611850T3 (da) * | 2015-12-31 | 2021-08-02 | Viasat Inc | Bredbåndssatellitkommunikationssystem under anvendelse af optiske feeder-links |
| FR3051618B1 (fr) * | 2016-05-20 | 2018-11-23 | Thales | Procede de basculement doux a diversite de sites de stations d'acces mis en oeuvre dans un systeme de telecommunications spatiales |
| CN110024299B (zh) * | 2016-09-28 | 2022-04-05 | Idac控股公司 | 用于波束管理的系统和方法 |
| US10601502B2 (en) * | 2018-02-05 | 2020-03-24 | Hughes Network Systems, Llc | Systems and methods for flexible assignment of beams to gateways in a high throughput digital payload satellite network |
| US11336365B2 (en) | 2018-05-17 | 2022-05-17 | Thales | Method for managing the telecommunication data traffic of a very high throughput satellite communication system |
-
2018
- 2018-11-15 FR FR1871837A patent/FR3088783B1/fr active Active
-
2019
- 2019-10-23 CA CA3119698A patent/CA3119698A1/fr active Pending
- 2019-10-23 US US17/293,427 patent/US11342967B2/en active Active
- 2019-10-23 WO PCT/EP2019/078795 patent/WO2020099077A1/fr not_active Ceased
- 2019-10-23 EP EP19789993.3A patent/EP3881439A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3088783B1 (fr) | 2020-11-27 |
| US20220029664A1 (en) | 2022-01-27 |
| CA3119698A1 (fr) | 2020-05-22 |
| US11342967B2 (en) | 2022-05-24 |
| WO2020099077A1 (fr) | 2020-05-22 |
| FR3088783A1 (fr) | 2020-05-22 |
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