RU2799503C1 - Method for routing delay-sensitive information flows in satellite communication network on non-geostationary spacecrafts connected by inter-satellite communication lines in one orbital plane and located on circular orbits - Google Patents

Abstract

FIELD: data transmission.

SUBSTANCE: invention is related to a satellite communication network, namely to the choice of information transmission route based on the choice of the shortest route to a spacecraft (SC) that has established communication with an earth station (ES). The specified technical result is achieved by determining the shortest path from the SC-sender of information to the SC that has established communication with the ES in the proposed multi-satellite orbital constellation (OC) of SC connected by inter-satellite communication lines (ICL) in one orbital plane (OP), in order to ensure information exchange of SC with ground services, which can be a flight control centre, a network control centre or a special information processing centre, and consumers of target information (TI) in real time. If there is an ICL in only one OP, the route between SCs can be laid either in the direction of the SC movement in the OP, or in the opposite direction with respect to the SC movement in the OP. Since the distances between SCs in one OP are the same, the criterion for the shortest path in one OP from the SC-sender of information to the SC that has established communication with the ES is the number of intermediate SC-retransmitters.

EFFECT: creation of an effective method for routing delay-sensitive information flows in a satellite communication network on non-geostationary spacecraft connected by inter-satellite communication lines in one orbital plane and located in circular orbits

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Description

The invention relates to a satellite communication network, namely to the choice of information transmission route based on the choice of the shortest route to a spacecraft (SC) that has established communication with an earth station (ES).

In order to ensure information exchange in real time with any spacecraft (SC) of multi-satellite orbital groups (MG) that are outside the radio visibility zones (ZRV) of earth stations for receiving and transmitting information (ES) located on the territory of Russia and launched into circular orbits without the use of an additional constellation of repeater satellites (CP), it is proposed to create a digital STN based on a satellite communications network (SCN) consisting of spacecraft representing CPs interconnected by inter-satellite communication lines (ILS) in only one orbital plane (OP).

Low-orbit and medium-orbit constellations of satellite communications, remote sensing of the Earth, satellite navigation and other space systems for various purposes can be options for such MGs.

Routing methods in a satellite communication network on non-geostationary spacecraft are known from the prior art, for example, a method with handover for several gateways via a satellite system (see US 10381748 B2, publ. 13.08.2019). The satellite communication system provides handover between satellites and multiple gateways. The terminals communicate with the first gateway via the first satellite when the beams of the first satellite cross the region. The second gateway is in communication with the first satellite and transmits the transmission to the second satellite. The first gateway is in the first location. The second gateway is at a second location separated from the first location in the orbital direction. The terminals switch to the second satellite when the beams of the second satellite begin to cross the area, and the terminals begin to connect and communicate with the second gateway through the second satellite. After all terminals of the plurality of terminals have switched to the second satellite, the first gateway will switch to the second satellite, and then the terminals in the region will communicate with the first gateway via the second satellite.

The disadvantage of the proposed method is the low efficiency of information transfer.

The closest analogue, according to the applicant, is an inter-satellite constellation (see RU 2660113, published on 07/05/2018), where all spacecraft are interconnected by inter-satellite communication lines in one orbital plane.

In the proposed architecture for building the MG, one of the main problems of information exchange is the task of transmitting information from the SC, which is outside the ground stations, to one of the SCs that have established communication with the ES. If there is an MLS in only one SU, only two options for transmitting information over the MLS are possible: to a neighboring spacecraft in the direction of travel or to a neighboring spacecraft in the direction opposite to the movement. Thus, the methods for routing information flows when organizing communication between neighboring SCs in only one OP are represented by one option based on the algorithm for finding the shortest path to SCs that have established communication with the ES.

Known from the field of technology, used in computer networks, is the Routing Information Protocol (RIP), which consists in counting and comparing the number of relay points ("hops", hops) represented by routers on the way from the source to the recipient of information.

However, the RIP routing protocol is not suitable for solving the above problem, because has the following disadvantages:

- has a limit on the number of relay points - there can be no more than 16;

- builds a route to only one given static recipient, and in our case it is necessary to solve the problem of choosing one of several satellites that have established communication with the ES;

- in addition, the recipients of information - the spacecraft that have established contact with the AP, are constantly changing. This is due to their orbital motion relative to the Earth.

Accordingly, there is a need to eliminate at least some of the disadvantages mentioned above. In particular, there is a need for a method to ensure the transmission of information from the SC, located outside the ERZ of the earth stations, to one of the SCs that have established communication with the ES.

This invention is directed to solving a technical problem associated with improving the efficiency of information transmission.

The technical result of the invention is the creation of an effective method for routing delay-critical information flows in a satellite communication network on non-geostationary spacecraft connected by inter-satellite communication lines in one orbital plane and located in circular orbits.

The technical result is achieved by means of a method for determining the shortest path from the spacecraft that sends information to the spacecraft that has established communication with the ES in the proposed MG of the spacecraft associated with the MLS in one OP, in order to ensure the information exchange of the spacecraft with ground services, which can be the flight control center , network control center or special information processing center, and consumers of target information (CI) in real time. If there is an MLS in only one SP, the route between the SC can be laid either in the direction of the SC movement to the OP, or in the opposite direction with respect to the SC movement in the OP. Since the distances between SVs in one SS are the same, the criterion for the shortest path in one SS from the SV-sender of information to the SV that has established communication with the ES is the number of intermediate SV-retransmitters.

The claimed technical result is achieved by creating a routing algorithm that takes into account the specifics of the CCC in non-GSO.

Achievement of the technical result is carried out due to:

- continuous exchange of information about the spacecraft that established contact with the AP;

- constant counting of the number of relay points, in the role of which the spacecraft act, on the way to the spacecraft that have established communication with the ES, and dynamic selection of the shortest of them;

- adaptive change in the direction of information transmission when the connection is broken in one of the directions.

The claimed invention is illustrated by the following figures:

fig. 1 - communication organization diagram of the SC-sender of information located in OP-1 and the SC-receiver of information located in OP-1 or OP-2, provided that ES-1 simultaneously established communication with OP-1 and OP-2 ;

fig. 2 - communication organization diagram of the SC-sender of information located in OP-1 and the SC-receiver of information located in OP-2, provided that ES-1 has established communication with OP-1, and ES-2 has established communication with OP-2 ;

fig. 3 - diagram of the organization of communication of the spacecraft-sender of information, located in OP-1, with ground services and recipients of CI;

fig. 4 - diagram of the organization of communication between ground services and DI receivers with the SC-receiver of information located in OP-1;

fig. 5 - routing algorithm from the KA-sender of information, located in OP-1 to the KA-receiver, located in OP-2;

Fig. 6 - routing algorithm from the spacecraft-sender of information located in OP-1 to ground services and recipients of CI;

Fig. 7 - routing algorithm from terrestrial services to the SC-receiver of information located in OP-1;

Fig. 8 - routing algorithm from CI receivers to the KA-receiver of information located in OP-1.

For the sake of simplicity, figures 1-10 show only the equipment that is functionally involved in a particular case.

Positions in figures 1-10 indicate the following:

1 - KA-sender of information (inf.), located in OP-1;

2 - onboard router (BM) of the SV-sender of information;

3 - databases of space vehicles (DB) of the sender spacecraft registered in the ES;

4 - the first set of the onboard radio-technical complex (BRTK-1) of the MLS of the spacecraft-sender of information;

5 - intermediate KA-transmitter of information OP-1;

6 - BM of the intermediate spacecraft information relay, OP-1;

7 - BRTK-1 MLS of the KA-transmitter of information OP-1;

8 - the second set of onboard radio-technical complex (BRTK-2) MLS KA-transmitter information OP-1;

9 - spacecraft that established (set) communication with ES-1 in OP-1;

10 - BM of the spacecraft that established communication with AP-1 in OP-1;

11 - BRTK-1 MLS of the spacecraft that established communication with AP-1 in OP-1;

12 - BRTK FLS of the spacecraft that established communication with ES-1 in OP-1;

13 - AP-1, which established communication with the spacecraft in OP-1;

14 - router ZS-1, which established communication with the spacecraft in OP-1;

15 - the first set of the radio engineering complex (RTK-1) ZS-1, which established communication with the spacecraft in OP-1;

16 - the second set of the radio engineering complex (RTK-2) ZS-1, which established communication with the spacecraft in OP-2;

17 - spacecraft that established communication with AP-1 in OP-2;

18 - BM of the spacecraft that established communication with AP-1 in OP-2;

19 - BRTK FLS of the spacecraft that established communication with ES-1 in OP-2;

20 - DB ZS-2 OP-2;

21 - BRTK-1 MLS of the spacecraft that established communication with AP-1 in OP-2;

22 - intermediate spacecraft information relay in OP-2;

23 - BM of the intermediate KA-transmitter of information in OP-2;

24 - BRTK-1 MLS of the KA-transmitter of information OP-2;

25 - BRTK-2 MLS of the SC information relay OP-2;

26 - KA-receiver of information;

27 - BM KA-receiver of information;

28 - BRTK-1 MLS KA-receiver of information; 29-BD ZS-1;

30 - ZS-2, which established contact with the spacecraft, OP-2;

31 - router ZS-2, which established communication with the SC OP-2;

32 - RTK-1 ZS-2, which established communication with the SC OP-2;

33 - DB of ground services;

34 - ground services;

35 - terrestrial services router;

36 - CI recipients;

37 - router of CI receivers; 38-BRTK-2 MLS KA 9;

39 - SC-receiver of information located in OP-1;

40 - onboard router of the spacecraft-receiver of information in OP-1;

41 - BRTK-1 MLS KA-receiver of information.

The proposed method for routing information to the SSN on non-geostationary spacecraft (NGS) SC, connected by inter-satellite communication lines in one orbital plane and located in circular orbits, is as follows.

The spacecraft located in the ground stations' ZRV establish communication with them in order to provide information exchange with the ES, as well as to relay information to the ES from other SCs of the same UE. After establishing communication with the AP, the SC informs all the SC of the same UE via the MLS about this. In turn, earth stations also exchange information about the spacecraft that have established communication with them. Information about the spacecraft that established communication with the ES is stored in each SC, in each ES and in ground services in the databases (DB) of spacecraft registered in the ES.

The logical meaning of the functional elements in the proposed SSS on the NGS SC, connected by inter-satellite communication lines in one orbital plane and located in circular orbits, is as follows:

- SC connected by MLS in one OP represent a satellite autonomous system (Satellite Autonomous System, SatAS);

- the entire MG, consisting of separate OPs performing AS functions, is a satellite wide area network (Satellite Wide Area Network, Sat WAN);

- the onboard router of the spacecraft, which has not established communication with the ES, performs the functions of a satellite internal router (Satellite Internal Router, SatIR) AS;

- the onboard router of the spacecraft, which has established communication with the ES, performs the functions of a satellite border router (Satellite Border Router, SatBR) AS;

- the router of the AP that has established communication with the satellite performs the functions of a border router (Border Router, BR) of the Wide Area Network (WAN);

- an earth station that has established communication simultaneously with two or more UEs, performs the functions of a virtual MLN between these UEs;

- two or more earth stations that have established communication with the spacecraft, connected by the NLS, also perform the functions of a virtual MLS between the OP.

The affiliation of the spacecraft to one or SatAS is indicated by their IP addresses. When determining the route, the on-board router of the KA-sender reads the destination IP addresses and, depending on which SatAS the recipients are in, builds different shortest routes.

If the IP packet is intended for an SC located in another SatAS (SS), then the SC onboard router counts the number of intermediate SC repeaters when transmitting information in the direction of the SC movement to the SS and in the opposite direction. Then, according to the criterion of the minimum number of intermediate SC-relays, it determines the shortest route to the SC that has established communication with the ES.

If the length of the routes in the direction of SC movement in the OP and in the opposite direction is the same, a less loaded route is selected for information transmission.

The ES router reads the IP addresses and if they are intended for the SC located in the UE that has established communication with it, then from its other set of radio engineering complex transmits information to the SC that has established communication with it. Then, the onboard router of the SC that has established communication with the ES and received an IP packet from it determines that the receiving SC is located in the same AS with it and, based on the criterion of the minimum number of intermediate internal onboard routers, determines the shortest route to the destination SC.

The algorithm for routing information from the SC-sender to the SC-receiver, located in the same SatAS with the SC-poisoner in the CCC on the NGS SC, connected by inter-satellite communication lines in the same orbital plane and located in circular orbits, is as follows (see Fig. 1).

Action 1. Sending KA-sender 1 information to recipients.

Step 1.1. If it is necessary to transfer information from the SV-sender 1, the onboard target or service equipment of the SV forms an array of information that arrives via the internal onboard data transmission network (IDN) to the internal port of the onboard router 2 of the SV-sender 1.

Step 1.2. BM 2 KA 1 reads the destination IP addresses and if the IP packet is intended for the recipient (KA 39) located with him in the same AS (in this case, it is OP-1), then the onboard router 2 KA 1 according to the criterion of the minimum number of intermediate KA -relays determines the shortest route to the destination SC 39.

Step.1.3. If the length of the routes in the direction of SC movement in the OP and in the opposite direction is the same, a less loaded route is selected for information transmission. Spacecraft periodically exchange information about the loading of inter-satellite communication lines with each other. The criterion for evaluating the load is the composite minimum throughput, i.e. when comparing routes, the minimum throughput values of all MLSs on the information transmission route are compared and the information transmission route with the maximum value of the minimum MLS throughput is selected.

Step 1.4. BM 2 SC 1 transmits information via the internal onboard SPD to the internal port of one of the sets of BRTK MLS (BRTK 4), which has established communication with the neighboring SC in the MLS in the desired direction of transmission, where all the necessary information transformations take place (formatting, coding and modulation, filtering and gain) for transmission via MLS.BRTK 4 KA 1 emits information via MLS to BRTK 7 adjacent in the same orbital plane KA 5.

Action 2. Retransmission by the intermediate KA relay 5 of information to recipients.

Step 2.1. BRTK 7 KA 5 receives information on MLS from BRTK 4 KA 1, where all the necessary transformations of information (filtering and amplification, demodulation and decoding, formatting) take place for transmission over the internal onboard SPT.

Step 2.2. Then, from the internal port of the BRTK 7 KA 5, the information arrives at the external port of the BM 6 KA 5 via the internal onboard SPD, which carries out routing from its other external port via the internal data bus to the internal port of the BRTK 8 KA 5.

Step 2.3. In BRTK 8 of SC 5, all the necessary transformations of information for transmission over the MLS and the radiation of information over the MLS to BRTK 11 of the adjacent SC 9 in the same orbital plane take place.

Action 3. Retransmission by the intermediate KA-relay 9 of information to recipients is carried out in the same way as described in the 2nd action.

Action 4. Reception of information on the KA-receiver.

Step 4.1. BRTK 41 KA 39 receives information on the MLS from BRTK 38 KA 9, where all the necessary transformations of information for transmission over the internal onboard SPT take place.

Step 4.2. Then, from the internal port of the BRTK 41, the information arrives at the external port of the BM 40 of the KA 39 via the internal onboard SPT, which carries out routing from its internal port via the onboard internal SPT to the consumer: to the onboard target or service equipment of the KA 39.

The algorithm for routing information from the SC-sender to the recipient located in different SatAS with the SC-poisoner in the CCC on the NGS SC, connected by inter-satellite communication lines in the same orbital plane and located in circular orbits, is as follows (see Fig. 1).

Action 1. Sending KA-sender 1 information to recipients.

Step 1.1. If it is necessary to transfer information from the SV-sender 1, the onboard target or service equipment of the SV forms an array of information that arrives via the internal on-board DTN to the internal port of the onboard router 2 of the SV-sender 1.

Step 1.2. BM 2 CA 1 reads the destination IP addresses and if the IP packet is intended for the recipient (CA 17) located in another AS (OP-2), then the onboard router 2 of CA 1 determines the shortest route to CA 9 by the criterion of the minimum number of intermediate onboard routers who established contact with AP 13.

Step 1.3. It is carried out in the same way as described in the 1st step at step 1.3 of the previous algorithm.

Step 1.4. It is carried out in the same way as described in the 1st step at step 1.4 of the previous algorithm.

Action 2. Retransmission by the intermediate KA-relay 5 of information to recipients is carried out in the same way as described in the 2nd action of the previous algorithm.

Action 3. Retransmission of information from SC 9 to ES 13.

Step 3.1. BRTK 11 KA 9 receives information on MLS from BRTK 8 KA 5, where all the necessary transformations of information for transmission over the internal onboard SPT take place.

Step 3.2. From the internal port of the BRTK 11 KA 5, information is received via the internal on-board SPD to the external port of the BM 10 KA 5, which reads the IP address of the recipient and determines that the recipient is located in another AS. In this case, if KA 5 has established communication with ES 13, then MU 10 routes information to ES 13 and from the external port of MU 10 via the onboard internal SPT, information is sent to BRTK 12.

Step 3.3 In RTK 12, KA 9 performs all the necessary transformations of information for transmission over the FLS, and RTK 12 emits information via the FLS on RTK 15 of ES 13.

Action 4.1. Retransmission of information from ES 13 to another SatAS.

Step 4.1.1. RTK 15 AP 13 receives information on the FLS from BRTK 12 FLS CA 5, where all the necessary transformations of information for transmission over the internal SPD take place.

Step 4.1.2. From the internal port of the RTK 15, information is received via the internal SPD to the external port of the router 14 of the ES 13, which reads the destination IP addresses and makes a request to the database 29. If the IP packet is intended for the recipient (KA 26) located in OP-2, the KA of which has established a connection with another set of RTC 16 AP 13, then performs routing to this OP-2. From another external port of the router 14, information on the internal SPD is sent to the internal port of the RTK 16 ES 13.

Step 4.1.3. In RTK 16 AP 13 all the necessary transformations of information for transmission over the FLS and RTK 16 AP 13 emit information via the FLS to BRTK 19 KA 17.

Action 5.1. Retransmission by the intermediate KA-relay 17, which has established communication with the AP 13 information in the SatAS OP-2.

Step 5.1.1. BRTK 19 KA 17 receives information on the FLS from the RTK 19 AP 13, where all the necessary transformations of information for transmission over the internal onboard SPT take place.

Step 5.1.2. From the internal port BRTK 19 KA 17, information on the internal SPD goes to the external port BM 18 KA 17, which reads the destination IP addresses and makes a request to the database 20. If the IP packet is intended for the recipient (KA 26) located in the same KA 17 OP (in the considered version - OP-2), then BM 18, according to the criterion of the minimum number of intermediate BMs, builds the shortest route to the SC-receiver 26 and transmits information from its other external port via the onboard internal SPD to the internal port of BRTK 21 KA 17.

Step.5.1.3. It is carried out in the same way as described in the 1st step at step 1.3 of the previous algorithm.

Step 6. Retransmission by the intermediate KA-relay 22 of information on the MLS to the KA-receiver 26 is carried out in the same way as described in the 2nd step of the previous algorithm.

Action 7. Obtaining information on the ILS by the receiving SC 26.

Step 7.1. BRTK 28 KA 26 receives information on MLS from BRTK 25 adjacent KA 22, where all the necessary information conversions for transmission over the internal onboard SPT take place.

Step 7.2. From the internal port BRTK 28 KA 26 information on the internal SPT goes to the external port BM 27 KA 28, which reads the destination IP addresses and determines to whom the information is intended in the onboard internal SPT (onboard service equipment or onboard target equipment). BM 27 transmits information from its internal port via onboard internal SPT to the recipient of information (onboard service equipment or onboard target equipment).

Action 4.2. Retransmission of information from ES 13 to another UE that has established communication with another ES 30.

Step 4.2.1. RTK 15 AP 13 receives information on the FLS from BRTK 12 FLS CA 5, where all the necessary transformations of information for transmission over the internal SPD take place.

Step 4.2.2. From the internal port of the RTK 15, information is received via the internal SPD to the external port of the router 14 of the ES 13, which reads the destination IP addresses, makes a request to the database 29. from the other ES 30 (see Fig. 2), then performs routing over the NLS to this ES 30.

Step.4.2.3. Router 31 of ES 30 receives information on the NLS, reads destination IP addresses and makes a request to database 20. on the MLS KA-receiver 26. From another external port of the router 31, information on the internal SPD is sent to the internal port of the RTK 32 of the ES 30.

Step 4.2.4. In RTK 16 AP 13 all the necessary transformations of information for transmission over the FLS and RTK 16 AP 13 emit information via the FLS to BRTK 19 KA 17.

Further actions 5.1, 6 and 7 occur in the same way as described in the considered algorithm above.

Action 4.3. Retransmission of information from AP 13 to the NLS.

Step 4.3.1. RTK 15 AP 13 receives information on the FLS from BRTK 12 FLS CA 5, where all the necessary transformations of information for transmission over the internal SPD take place.

Step 4.3.2. From the internal port of the RTK 15, information is received via the internal SPD to the external port of the router 14 of the ES 13, which reads the destination IP addresses and, if the IP packet is intended for a recipient located in the NLS, then transmits information via the NLS to these recipients: terrestrial services 34 or recipients CI 36 (see Fig. 3).

Step 4.3.3. The external port of the router 35 of the terrestrial services 34 (or the router 37 of the recipients of the QI 36) receives information from the NLS, which reads the IP address and determines to whom this information is intended in the internal SPD. From the internal port of the router 35 (router 37), information is received via the internal DTN to the recipient, which can be a server or an operator's workstation.

The algorithm for routing information from terrestrial services and CI receivers to the receiver SC in the SSS on the NGS SC, connected by inter-satellite communication lines in one orbital plane and located in circular orbits, is as follows (see Fig. 4).

Action 1. Sending information from terrestrial services 34 and recipients DI 36 to the space vehicle-receiver.

Step 1.1. From the workstation of the operator or the server of terrestrial services 34 (or recipients of QI 36) the information is received via the internal SPD to the router 35 of terrestrial services 34 (or to the router 37 of recipients of QI 36).

Step 1.2. The router 37 of the recipients PI 36 reads the IP address and determines that the recipient is the SC (in the considered version - SC 1) and builds a route along the NLS to the nearest ES (in the considered variant - ES 13) for the purpose of further relaying information.

Step 1.3. Router 35 of terrestrial services 34 reads the IP address, makes a request to the database 38 and determines which of the ES (in our case - ES 13) established a connection with OP-1, where the called SC 1 is located, and builds a route along the NLS to ES 13 .

Action 2. Retransmission of information from the AP to OP-1.

Step 2.1. From the router 37 recipients DI 36 information is sent to the external port of the router 31 ES 30, which reads the IP address, makes a request to the database 20 and determines that OP-1 KA-receiver 1, has established a connection with the ES 13. From another external port of the router 31 ES 30 information is transmitted via NLS to the external port of the router 14 ES 13.

Step 2.2. Router 14 ES 13 reads the IP address, makes a request to the database 29 and determines that OP-1 KA-recipient 1 has established a connection with ES 13. From another external port of the router 14, information on the internal SPD is sent to the internal port of the RTK 15 ES 13 .

Step 2.3. In RTK 15 AP 13 all the necessary transformations of information for transmission via FLS and RTK 15 emit information via FLS to BRTK 12 KA 9.

Action 3. Retransmission by the intermediate KA-relay 17, which has established communication with the ES 13, information in the SatAS OP-1.

Step 3.1. BRTK 12 CA 9 receives information on the FLS from the RTK 15 AP 13, where all the necessary transformations of information for transmission through the internal onboard SPT.

Step 3.2. From the internal port of BRTK 12 KA 9, information on the internal SPD goes to the external port of BM 10 KA 9, which reads the destination IP addresses and if the IP packet is intended for the recipient (KA 1) located in the same orbital plane (in the considered version - OP-1), then BM 10, according to the criterion of the minimum number of intermediate BMs, builds the shortest route to the destination SV 1 and transmits information from its other external port via the onboard internal DTN to the internal port of BRTK 11 of SV 9.

Step.3.3. In BRTK 11, SC 9 takes place all the necessary transformations of information for transmission over the MLS and BRTK 11 emits to the neighboring SC 5.

Action 4. Retransmission by the intermediate KA-relay 5 of information to recipients.

Step 4.1. BRTK 8 KA 5 receives information on the MLS from BRTK 11 KA 5, where all the necessary transformations of information for transmission over the internal onboard SPT take place.

Step 4.2. Then, from the internal port of the BRTK 8 KA 5, the information arrives at the external port of the BM 6 KA 5 via the internal onboard SPT, which transfers information from its other external port via the internal data bus to the internal port of the BRTK 7 KA 5.

Step 4.3. In BRTK 7 of SC 5, all the necessary transformations of information for transmission over the MLS and the radiation of information over the MLS to BRTK 4 of the neighboring SC 1 take place.

Action 5. Obtaining information on the MLS by the receiving SC 1.

Step 5.1. BRTK 4 KA 1 receives information on the MLS from BRTK 7 adjacent KA 5, where all the necessary transformations of information for transmission via the internal onboard SPT take place.

Step 5.2. From the internal port of the BRTK 4 KA 1, information on the internal SPD is sent to the external port of the BM 2 KA 1, which reads the destination IP addresses and determines to whom the information is intended in the onboard internal SPT (onboard service equipment or onboard target equipment). BM 2 transmits information from its internal port via onboard internal SPT to the recipient of information (onboard service equipment or onboard target equipment).

Thus, the claimed method for routing delay-critical information flows in a satellite communication network on non-geostationary spacecraft connected by inter-satellite communication lines in the same orbital plane and located in circular orbits increases the efficiency of information transmission.

Claims (6)

1. A method for routing information flows critical to delays in a satellite communication network on non-geostationary spacecraft connected by inter-satellite communication lines in the same orbital plane and located in circular orbits, including the transfer of information between non-geostationary spacecraft located in the same orbital plane with terrestrial services and consumers of target information in real time, characterized in that spacecraft located in the radio visibility zone of earth stations establish communication with them, spacecraft transmit information via inter-satellite communication lines to all spacecraft located in the same orbital plane with them, earth stations also exchange information about spacecraft that have established communication with them , information about spacecraft that have established communication with an earth station is stored in each spacecraft, in each earth station and in terrestrial services in databases, registered earth stations of spacecraft, when determining the route, the onboard router of the sending spacecraft reads the destination IP addresses, while the IP addresses of the spacecraft indicate their belonging to one or another satellite autonomous system consisting of spacecraft connected by inter-satellite communication lines in the same orbital plane, and, depending on which satellite autonomous systems the recipients are in, builds different shortest routes: if the IP packet is intended for the receiving spacecraft located in the same satellite autonomous system with the sending spacecraft, then the onboard router of the sending spacecraft determines the shortest route to the receiving spacecraft based on the criterion of the minimum number of intermediate spacecraft-retransmitters; if the IP packet is intended for a spacecraft located in a satellite autonomous system different from the satellite autonomous system in which the sending spacecraft is located, then the onboard router of the sending spacecraft determines the shortest route to the spacecraft based on the criterion of the minimum number of intermediate spacecraft-retransmitters that has established communication with the earth station, the earth station router reads the IP addresses and, if they are intended for the spacecraft located in the orbital plane that has established communication with the earth station, from its set of radio-technical complex transmits information to the spacecraft, the onboard router of the spacecraft that has established communication with the earth station, and the IP packet received from it determines that the receiving spacecraft is in the same satellite autonomous system with it and, according to the criterion of the minimum number of intermediate spacecraft-relays, determines the shortest route to the receiving spacecraft. 2. The method of claim 1, wherein the ground services are a mission control center, a network control center, or an information processing center.

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