Method, device and equipment for processing inter-satellite laser link signal

Abstract

The embodiment of the invention provides an inter-satellite laser link signal processing method, device and equipment, and is applied to satellites, and the method comprises the steps: carrying out the baseband processing of a laser link signal through employing an Ethernet communication protocol, and obtaining a data flow electric signal; and modulating the data stream electric signal to obtain an optical signal, and transmitting the optical signal. In the technical scheme provided by the embodiment of the invention, the satellite directly adopts the Ethernet communication protocol to carry out baseband processing on the laser link signal, and a physical frame does not need to be packaged outside a data link frame, so that the overhead of a satellite laser link is reduced, the bearing efficiency of a satellite laser communication network is improved, and the communication efficiency of the satellite laser communication network is improved. The Ethernet communication protocol is applied to the ground network in a large range for a long time, and the space link communication protocol is developed towards the direction adaptive to the Ethernet communication protocol, so that the sharing of related industrial chains of the space network and the ground network is facilitated, and the fusion development of the space-ground integrated network is facilitated.

Description

Technical Field

[0001] The present application relates to the field of satellite communication technology, and in particular to a method, device and equipment for processing inter-satellite laser link signals. Background Art

[0002] At present, in satellite laser communications, the intersatellite link baseband signal processing part is designed to be implemented in the laser communication payload, and the physical layer baseband signal processing method is: encapsulate custom physical frames outside the data link frames, and add channel coding and other overheads to the custom physical frames to achieve reliable transmission of satellite laser links. However, the method of encapsulating custom physical frames outside the data link frames often makes the satellite laser communication network bearer efficiency low and not highly compatible with the ground network. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method, device and equipment for processing intersatellite laser link signals to improve the carrying efficiency of satellite laser communication networks and promote the integrated development of space-ground integrated networks. The specific technical solutions are as follows:

[0004] In a first aspect, an embodiment of the present application provides a method for processing an intersatellite laser link signal, which is applied to a satellite, and the method includes:

[0005] The Ethernet communication protocol is used to perform baseband processing on the laser link signal to obtain a data stream electrical signal;

[0006] The data stream electrical signal is modulated to obtain an optical signal, and the optical signal is emitted.

[0007] In some embodiments, the baseband processing includes:

[0008] Ethernet PHY layer encoding and scrambling, FEC encoding and interleaving.

[0009] In some embodiments, the satellite includes a space network information processing unit and a laser communication payload;

[0010] The baseband processing is performed by the spatial network information processing unit;

[0011] The modulation and transmission are performed by the laser communication payload.

[0012] In some embodiments, the spatial network information processing unit converts the data stream electrical signal into serial data;

[0013] The laser communication payload converts the serial data into the data stream electrical signal.

[0014] In a second aspect, an embodiment of the present application provides a method for processing an intersatellite laser link signal, which is applied to a satellite, and the method includes:

[0015] Demodulate the optical signal to obtain a data stream electrical signal;

[0016] The data stream electrical signal is baseband processed using an Ethernet communication protocol to obtain a laser link signal.

[0017] In some embodiments, the baseband processing includes:

[0018] Ethernet PHY layer decoding and descrambling, FEC decoding and deinterleaving.

[0019] In some embodiments, the satellite includes a space network information processing unit and a laser communication payload;

[0020] The baseband processing is performed by the spatial network information processing unit;

[0021] The demodulation is performed by the laser communication payload.

[0022] In some embodiments, the laser communication payload converts the data stream electrical signal into serial data;

[0023] The spatial network information processing unit converts the serial data into the data stream electrical signal.

[0024] In a third aspect, an embodiment of the present application provides a device for processing an intersatellite laser link signal, which is applied to a satellite, and the device includes:

[0025] A baseband processing module, used to perform baseband processing on the laser link signal using an Ethernet communication protocol to obtain a data stream electrical signal;

[0026] The modulation module is used to modulate the data stream electrical signal to obtain an optical signal and transmit the optical signal.

[0027] In some embodiments, the baseband processing includes:

[0028] Ethernet PHY layer encoding and scrambling, FEC encoding and interleaving.

[0029] In some embodiments, the satellite includes a space network information processing unit and a laser communication payload;

[0030] The baseband processing is performed by the spatial network information processing unit;

[0031] The modulation and transmission are performed by the laser communication payload.

[0032] In some embodiments, the spatial network information processing unit converts the data stream electrical signal into serial data;

[0033] The laser communication payload converts the serial data into the data stream electrical signal.

[0034] In a fourth aspect, an embodiment of the present application provides a device for processing an intersatellite laser link signal, which is applied to a satellite, and the device includes:

[0035] A demodulation module, used to demodulate the optical signal to obtain a data stream electrical signal;

[0036] The baseband processing module is used to perform baseband processing on the data stream electrical signal using an Ethernet communication protocol to obtain a laser link signal.

[0037] In some embodiments, the baseband processing includes:

[0038] Ethernet PHY layer decoding and descrambling, FEC decoding and deinterleaving.

[0039] In some embodiments, the satellite includes a space network information processing unit and a laser communication payload;

[0040] The baseband processing is performed by the spatial network information processing unit;

[0041] The demodulation is performed by the laser communication payload.

[0042] In some embodiments, the laser communication payload converts the data stream electrical signal into serial data;

[0043] The spatial network information processing unit converts the serial data into the data stream electrical signal.

[0044] In a fifth aspect, an embodiment of the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0045] Memory, used to store computer programs;

[0046] The processor is used to implement the method steps described in any one of the first aspect or the second aspect when executing the program stored in the memory.

[0047] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method steps described in any one of the first aspect or the second aspect are implemented.

[0048] Beneficial effects of the embodiments of the present application:

[0049] In the technical solution provided by the embodiment of the present application, the satellite directly uses the Ethernet communication protocol to perform baseband processing on the laser link signal, and there is no need to encapsulate the physical frame outside the data link frame, which reduces the overhead of the satellite laser link and improves the carrying efficiency of the satellite laser communication network. In addition, the Ethernet communication protocol has been widely used in ground networks for a long time. The development of the space link communication protocol towards the adaptation of the Ethernet communication protocol is conducive to the sharing of the related industrial chains of the space network and the ground network, and is conducive to the integrated development of the space-ground integrated network.

[0050] Of course, implementing any product or method of the present application does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0052] Figure 1 A first flow chart of a method for processing intersatellite laser link signals provided in an embodiment of the present application;

[0053] Figure 2 A schematic diagram of a structure of an Ethernet standard frame structure provided in an embodiment of the present application;

[0054] Figure 3 A schematic diagram of a process for processing an intersatellite laser link signal of a transmitting satellite provided in an embodiment of the present application;

[0055] Figure 4 A second flow chart of the method for processing intersatellite laser link signals provided in an embodiment of the present application;

[0056] Figure 5 A schematic diagram of a process for processing an inter-satellite laser link signal of a receiving satellite provided in an embodiment of the present application;

[0057] Figure 6 A schematic diagram of the structure of an intersatellite communication network provided in an embodiment of the present application;

[0058] Figure 7 A schematic diagram of a first structure of an intersatellite laser link signal processing device provided in an embodiment of the present application;

[0059] Figure 8 A second structural schematic diagram of the intersatellite laser link signal processing device provided in an embodiment of the present application;

[0060] Fig. 9A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present application belong to the scope of protection of this application.

[0062] Satellite laser communication is a cutting-edge technology in the field of satellite communications. It has the advantages of large communication capacity, strong anti-electromagnetic interference ability, good confidentiality, and no need for radio frequency license. It is very suitable for application in space wireless large-capacity communication scenarios.

[0063] The existing satellite laser communication payload includes a signal processing system and control system located in the satellite platform cabin and an ATP (Acquisition, Tracking, Pointing) optical-mechanical system located outside the satellite platform cabin. Among them, the optical-mechanical system mainly includes coarse / fine tracking mechanisms, advance aiming mechanisms, receiving / transmitting optical antennas, and tracking light detection units, which are mainly responsible for the spatial deflection pointing, expansion / contraction of laser beams, beacon light detection, and relay of receiving and transmitting light circuits of the laser communication payload. The signal processing system and control system mainly include a main control unit, a coarse / fine tracking control unit, an advance aiming control unit, an optical amplification unit, a secondary power supply, and a signal processing unit, etc. It is mainly responsible for the overall control and signal processing of the laser communication terminal.

[0064] At present, the processing part of the inter-satellite laser link signal (that is, the inter-satellite link baseband signal) is designed to be implemented in the laser communication payload, and most of the inter-satellite laser link signal processing adopts the form of encapsulating the physical frame outside the data link frame, for example, encapsulating it into a link layer frame format adapted to the CCSDS (Consultative Committee for Space Data Systems) or a custom frame format, and adding channel coding and other overheads in the physical frame to achieve reliable transmission of the satellite laser link.

[0065] However, the current intersatellite laser link signal processing adopts the form of custom encapsulation of physical frames outside the data link frame, which often accounts for too much overhead. The development and testing cycle of the custom physical frame form is long, which cannot meet the needs of rapid iteration construction of satellite Internet. The method of encapsulating and adapting the CCSDS link layer frame format outside the data link frame does not take into account the scenario of large-scale space networking of satellite Internet, and there are problems with insufficient capabilities of CCSDS link technology OAM (Operation Administration and Maintenance), link resource allocation, and congestion control. At the same time, the CCSDS system protocol lacks support capabilities for ground network technology, and it will not be possible to achieve the integration and common evolution of the space-ground network system in the future.

[0066] In order to solve the above problems, the present application embodiment provides a method for processing inter-satellite laser link signals, such as Figure 1 As shown, applied to a satellite, the method comprises:

[0067] Step S11, using the Ethernet communication protocol to perform baseband processing on the laser link signal to obtain a data stream electrical signal.

[0068] Step S12, modulating the data stream electrical signal to obtain an optical signal, and transmitting the optical signal.

[0069] In the technical solution provided by the embodiment of the present application, the satellite directly uses the Ethernet communication protocol to perform baseband processing on the laser link signal, and there is no need to encapsulate the physical frame outside the data link frame, which reduces the overhead of the satellite laser link and improves the carrying efficiency of the satellite laser communication network. In addition, the Ethernet communication protocol has been widely used in ground networks for a long time. The development of the space link communication protocol towards the adaptation of the Ethernet communication protocol is conducive to the sharing of the related industrial chains of the space network and the ground network, and is conducive to the integrated development of the space-ground integrated network.

[0070] In an embodiment of the present application, the satellite communication network model may include a network layer, an Ethernet MAC (Medium Access Control) layer, and an Ethernet PHY layer.

[0071] In the above step S11, the network layer in the satellite communication network model can use communication protocols such as IP (Internet Protocol), and the data link layer (including Ethernet MAC layer and Ethernet PHY layer) and the physical layer use laser communication transmission. The satellite performs baseband processing on the laser link signal at the Ethernet MAC layer and Ethernet PHY layer, that is, assembling Ethernet standard frames in the data link frame, and encoding and encapsulating to obtain data stream electrical signals. The Ethernet standard frame structure is as follows: Figure 2As shown, it includes: a 7-byte preamble, a 1-byte frame start delimiter, a 6-byte destination address, a 6-byte source address, a 2-byte data type, 46 to 1500 bytes of data and a 4-byte FCS (Frame Check Sequences). After the satellite assembles the laser link signal into an Ethernet standard frame, it performs encoding processing to obtain a data stream electrical signal.

[0072] In the embodiment of the present application, the baseband processing of the laser link signal may specifically include the following steps:

[0073] Step a1: Data caching.

[0074] The network layer submits the laser link signal to be sent to the MAC layer in the data link layer, and the MAC layer caches the laser link signal submitted to it by the network layer in its own buffer for caching.

[0075] Step a2: Fill the payload.

[0076] According to the Ethernet communication protocol standard, the minimum size of the data field of the Ethernet standard frame is 46 bytes. Therefore, if the data sent by the network layer is less than 46 bytes, the Ethernet MAC layer will fill the data field with "0" until the data is greater than or equal to 46 bytes.

[0077] Step a3: Get the destination address.

[0078] The Ethernet MAC layer queries the ARP (Address Resolution Protocol) table according to the network layer destination address to obtain the destination MAC address as the destination address of the next hop.

[0079] Step a4: Get the source address.

[0080] The Ethernet MAC layer uses the MAC address of the local device as the source address.

[0081] Step a5: Fill the length type value.

[0082] The Ethernet MAC layer fills the length type value of the data according to the network layer protocol, such as character type char, single-precision floating point type float, double-precision floating point type double, or long integer type long int, etc. These are only partial examples and do not contain any limiting effect.

[0083] Step a6: Calculate the CRC (Cyclic Redundancy Check) value and assemble it into an Ethernet standard frame.

[0084] The Ethernet MAC layer calculates a 32-bit CRC check value for the four fields of DA (Destination Address), SA (Source Address), length type, and data, and puts it into the FCS field at the end of the frame.

[0085] Step a7: Encode the Ethernet standard frame to obtain a data stream electrical signal.

[0086] In the above step S12, the satellite modulates the data stream electrical signal in the laser communication payload based on information such as intensity or phase to obtain an optical signal. The optomechanical system collimates and expands the beam through the optical system, and sends the modulated optical signal to the laser communication payload at the receiving end through the space link.

[0087] In some embodiments, the baseband processing of the laser link signal may include: encoding and scrambling processing of the Ethernet PHY layer, FEC encoding and interleaving processing.

[0088] In the embodiment of the present application, after the satellite processes the laser link signal into the Ethernet standard frame format, the Ethernet standard frame format (MAC frame) can be sent to the PCS (Physical Coding Sublayer) in the Ethernet PHY layer through the RS (Reconciliation Sublayer) via the XGMII interface, and the PCS in the Ethernet PHY layer further encodes (such as 64 / 66B encoding) and scrambles the obtained Ethernet standard frame. The encoding and scrambling processing can randomize the interference signal, reduce inter-code interference and jitter, facilitate the extraction of the receiving end, and expand the spectrum of the laser link signal to achieve the encryption effect.

[0089] In the embodiment of the present application, after the encoding and scrambling process, the satellite can further perform FEC (Forward Error Correction) encoding and interleaving processing on the signal obtained after the encoding and scrambling process at the Ethernet PHY layer to obtain a data stream electrical signal. The satellite further performs FEC encoding and interleaving on the signal obtained after the encoding and scrambling process to ensure the reliability of long-distance space link transmission. In the embodiment of the present application, the inter-satellite FEC codeword can select mature ground FEC codewords, such as RS (576, 514) and RS (255, 223), or EFEC (Enhance Forward Error Correction) codewords, or a cascade of multiple FEC codewords, which is not limited to this.

[0090] In some embodiments, the satellite may include a space network information processing unit and a laser communication payload. The baseband processing of the laser link signal may be performed by the space network information processing unit; modulation and transmission may be performed by the laser communication payload. Among them, the space network information processing unit may process data of the network layer, Ethernet MAC layer, and Ethernet PHY layer, that is, it is responsible for the large-capacity baseband processing of the laser link signal and the routing switching of the space network, efficient resource scheduling, and flexible allocation of system resources; the laser communication payload includes an optical-mechanical system and a signal processing and control system, and the signal processing and control system may process data of the PMA (Physical Media Attachment) layer. The satellite may perform baseband processing on the laser link signal directly in the space network information processing unit, without encapsulating a custom physical frame outside the data link frame, thereby reducing the overhead of the satellite laser link and improving the carrying efficiency of the satellite laser communication network.

[0091] In the embodiment of the present application, the Ethernet PHY layer may also include a PMA layer. Accordingly, the space network information processing unit and the laser communication payload may also process data at the PMA (Physical Media Attachment) layer. For example, the space network information processing unit converts the data stream electrical signal into serial data at the PMA layer; the signal processing and control system in the laser communication payload converts the serial data in the PMA layer of the laser communication payload into a data stream electrical signal. The serial data output by the space network information processing unit is connected to the intersatellite laser payload unit via a Serdes (SERializer-DESerializer) interface.

[0092] In the embodiment of the present application, the space network information processing unit and the laser communication payload can also complete the conversion between the data stream electrical signal and the serial data in other ways, and then complete the transmission of the data stream electrical signal between the space network information processing unit and the laser communication payload, and there is no limitation on this.

[0093] In order to explain the above-mentioned intersatellite laser link signal processing method in detail, the present application embodiment provides the following Figure 3 The schematic diagram of the processing flow of the inter-satellite laser link signal of the transmitting satellite shown in the figure may include the following steps:

[0094] Step b1: The Ethernet MAC layer assembles the laser link signal into the Ethernet standard frame format.

[0095] Here, reference may be made to the description of steps a1 to a6 in the baseband processing in the above step S11, which will not be repeated here.

[0096] Step b2: 64 / 66B encoding and scrambling.

[0097] In an embodiment of the present application, an RS (coordination sublayer) can be set between the Ethernet MAC layer and the Ethernet PHY layer. The Ethernet MAC layer sends the Ethernet standard frame to the PCS of the Ethernet PHY layer through the RS (coordination sublayer) via XGMII (10Gig bit Media Independent Interface). The PCS performs 64 / 66B encoding and scrambling on the above Ethernet standard frame.

[0098] Step b3: FEC encoding and interleaving.

[0099] The Ethernet PHY layer performs FEC encoding and interleaving processing on the signal obtained after the above 64 / 66B encoding and scrambling processing to obtain a data stream electrical signal.

[0100] Step b4: Serial data interface transmission.

[0101] The space network information processing unit converts the data stream electrical signal into serial data at the PMA layer and transmits it to the laser communication payload. After receiving the serial data, the PMA layer in the laser communication payload converts the serial data into the data stream electrical signal.

[0102] Step b5: Optical signal modulation and spatial light emission.

[0103] The signal processing system of the laser communication payload modulates the data stream electrical signal into a laser signal based on information such as intensity or phase at the PMD (Physical Media Dependent) layer. The optomechanical system collimates and expands the modulated laser signal through the optical system and sends it to the receiving laser communication payload through a space link.

[0104] In the embodiment of the present application, the satellite includes a space network information processing unit, which is responsible for the large-capacity baseband processing of inter-satellite link signals and the routing switching of space networking, efficient resource scheduling and flexible allocation of system resources, and performs FEC encoding and interleaving on the Ethernet standard frame format, encapsulating it into a data stream electrical signal, which can ensure the data transmission reliability of long-distance communication.

[0105] Corresponding to the above-mentioned method for processing intersatellite laser link signals, the embodiment of the present application also provides a method for processing intersatellite laser link signals, such as Figure 4 As shown, the method is applied to a satellite, which is a receiving satellite, and includes the following steps:

[0106] Step S41, demodulate the optical signal to obtain a data stream electrical signal.

[0107] Step S42, using the Ethernet communication protocol to perform baseband processing on the data stream electrical signal to obtain a laser link signal.

[0108] In the technical solution provided by the embodiment of the present application, the satellite directly uses the Ethernet communication protocol to perform baseband processing on the data stream electrical signal, without the need for processing outside the data link frame, which reduces the overhead of the satellite laser link and improves the carrying efficiency of the satellite laser communication network. In addition, the Ethernet communication protocol has been widely used in ground networks for a long time, and the development of the space link communication protocol towards the adaptation of the Ethernet communication protocol is conducive to the sharing of the space network and the ground network related industrial chain, and is conducive to the integrated development of the space-ground integrated network.

[0109] In the above step S41, the optical signal is beam-contracted through the optical antenna and the optical system and connected to the photodetector in the laser communication payload. In addition, when the optical signal connected is a phase modulated signal, it is necessary to coherently mix the spatial light and the local oscillator light before connecting to the photodetector. The laser communication payload of the satellite receives optical signals from other satellites through the optical-mechanical system, and then demodulates the received optical signals in the PMD layer to obtain data stream electrical signals.

[0110] In the above step S42, the Ethernet PHY layer receives the data stream electrical signal from the laser communication payload and performs baseband processing on it. In the embodiment of the present application, the above baseband processing of the data stream electrical signal may specifically include the following steps:

[0111] Step c1: Decode the data stream electrical signal to obtain an Ethernet standard frame.

[0112] Step c2: Frame.

[0113] At the Ethernet MAC layer, the satellite determines the starting position of the current Ethernet standard frame based on the preamble and frame start delimiter in the Ethernet standard frame, and ends the frame reception through the specific EPD (End of Packet Delimiter) in the IPG (Interpacket Gap).

[0114] Step c3: Check payload CRC.

[0115] At the Ethernet MAC layer, a CRC check calculation is performed on the currently received Ethernet standard frame. If the check is correct, the Ethernet standard frame is received; if the check is wrong, the Ethernet standard frame is discarded.

[0116] Step c4: Determine the destination address.

[0117] Whenever the data link layer receives a data frame, it extracts the frame header of the data frame, finds the destination MAC address, and compares it with the address items in the receive address list. If it encounters an address in the list that is the same as the destination MAC address of the data frame, it stops comparing, receives the data frame, and puts the data frame into the receive queue corresponding to the upper layer protocol; if no matching MAC address is found in the entire receive list, the data frame is discarded.

[0118] In some embodiments, the baseband processing of the data stream electrical signal may include: Ethernet PHY layer decoding (such as 64 / 66B encoding) and descrambling processing, FEC decoding and deinterleaving processing.

[0119] In an embodiment of the present application, after the satellite receives the data stream electrical signal from the laser communication payload, it can perform FEC decoding and deinterleaving processing on the received data stream electrical signal at the Ethernet PHY layer, and then the PCS in the Ethernet PHY layer decodes and descrambles the data stream electrical signal after FEC decoding and deinterleaving processing to extract the Ethernet standard frame.

[0120] In some embodiments, the satellite may include a space network information processing unit and a laser communication payload; baseband processing of the data stream electrical signal is performed by the space network information processing unit; and demodulation is performed by the laser communication payload.

[0121] In the embodiment of the present application, the space network information processing unit and the laser communication payload can process the data of the PMA layer. Specifically, the laser communication payload converts the data stream electrical signal into serial data at the PMA layer; the space network information processing unit converts the serial data into the data stream electrical signal at the PMA layer.

[0122] In order to explain the above-mentioned intersatellite laser link signal processing method in detail, the present application embodiment provides the following Figure 5 The schematic diagram of the processing flow of the inter-satellite laser link signal of the receiving satellite shown in the figure may include the following steps:

[0123] Step d1: Optical signal reception and demodulation.

[0124] The laser communication payload demodulates the optical signal received by the optical-mechanical system at the PMD layer according to the relevant communication system. The relevant communication system here can be: intensity modulation direct detection, phase modulation coherent detection, etc., or other communication systems, which are not limited here.

[0125] Step d2: Serial data interface transmission.

[0126] The laser communication payload converts the data stream electrical signal into serial data at the PMA layer and transmits it to the space network information processing unit; after receiving the serial data, the PMA layer in the space network information processing unit converts the serial data into a data stream electrical signal.

[0127] Step d3: FEC decoding and deinterleaving.

[0128] The Ethernet PHY layer performs FEC decoding and deinterleaving processing on the above-mentioned received data stream electrical signal, and sends the processed data stream electrical signal to the PCS of the Ethernet PHY layer.

[0129] Step d4: 64 / 66B decoding and descrambling to obtain Ethernet standard frames.

[0130] The PCS of the Ethernet PHY layer performs 64 / 66B decoding and descrambling on the signal obtained after the above FEC decoding and deinterleaving processing to obtain an Ethernet standard frame, and sends it to the Ethernet MAC layer through the RS via XGMII.

[0131] Step d5: The Ethernet MAC layer processes the obtained Ethernet standard frame into a laser link signal.

[0132] Here, reference may be made to the description of step c2 to step c4 in the baseband processing in the above step S42, which will not be repeated here.

[0133] The following is an application example to illustrate the above-mentioned intersatellite laser link signal processing method. In a low-orbit satellite Internet with thousands of satellites, the system bearer network builds a protocol stack architecture with reference to the OSI (Open System Interconnection) seven-layer reference model, as shown in Table 1. In the network construction model, the network layer is mainly responsible for the forwarding and routing of IP packets on the satellite nodes, and the data link layer is mainly responsible for the reliability transmission of the point-to-point link between two nodes (that is, satellites) and the data encapsulation integrity verification.

[0134] Table 1

[0135]

[0136] Figure 6 A structural schematic diagram of an inter-satellite communication network provided in an embodiment of the present application, the inter-satellite communication network may include multiple satellites, and the satellites communicate with each other through inter-satellite links. Figure 6 Only three satellites are shown as an example. In actual applications, the number of satellites included in the inter-satellite communication network is not limited thereto. For example, the inter-satellite communication network in the embodiment of the present application may specifically be an Internet including thousands of low-orbit satellites.

[0137] In the embodiment of the present application, each satellite includes a satellite access / feeding payload, a space network information processing unit, and a laser communication payload. Among them, the satellite access / feeding payload is used to support the access and feeding communication of the ground terminal; the space network information processing unit is used for baseband processing of the satellite inter-satellite communication system and supports signal forwarding and routing between satellite laser communication terminals; the laser communication payload is used to transmit signals between satellites through inter-satellite links. In the embodiment of the present application, the satellite terminal is a ground user access terminal; the ground gateway is connected to the ground network, can receive user data transmitted through the satellite network, and access the user data to other ground networks.

[0138] In the embodiment of the present application, the satellite terminal needs to communicate with the ground gateway station, and the satellite terminal signal is connected to satellite A through the onboard access payload. The space network information processing unit of satellite A queries the destination address and needs to transmit the signal to the landing satellite C and then feed it to the ground gateway station. Satellite A submits the data to be sent by the network layer to the Ethernet MAC layer; the Ethernet MAC layer encapsulates the data to be sent in Ethernet standard frames, and sends the data to the Ethernet PHY layer through the coordination sublayer; the Ethernet PHY layer performs corresponding code block encoding, scrambling, FEC encoding and interleaving on the above received data, and converts the obtained data stream electrical signal into a serial signal at the PMA layer, which is then sent by the space network information processing unit to the laser communication payload for corresponding optical signal modulation and transmission.

[0139] Satellite B receives the optical signal from satellite A via the intersatellite link. The laser communication payload performs photoelectric conversion and signal demodulation on the received optical signal, and transmits the demodulated signal to the space network information processing unit through a serial line for subsequent baseband processing. The intersatellite link communication process between satellite B and satellite C is the same as the intersatellite link signal processing process between satellite A and satellite B, which will not be repeated here.

[0140] By applying the technical solution provided in the embodiment of the present application, compared with the traditional physical layer frame sealing form, the inter-satellite link communication method based on the Ethernet communication system (that is, using the Ethernet MAC+PHY communication protocol) has a higher carrying efficiency; in the Ethernet PHY layer, the 64 / 66B encoded and scrambled data is further FEC encoded and interleaved to ensure the reliability of long-distance space link transmission; in addition, in the embodiment of the present application, the space network information processing unit can reuse the ground Ethernet communication protocol architecture, such as the above Figure 3 and Figure 5Therefore, the inter-satellite link communication system can obtain better upper layer (that is, network layer) fit, better ground communication system integration capability, and obtain the OAM function of the ground communication system and the time slicing capability based on FlexE (Flexible Ethernet), that is, the inter-satellite link OAM function and the time slicing capability based on FlexE.

[0141] Corresponding to the above-mentioned method for processing intersatellite laser link signals, the embodiment of the present application further provides a device for processing intersatellite laser link signals, such as Figure 7 As shown, the device is applied to a satellite and comprises:

[0142] The baseband processing module 71 is used to perform baseband processing on the laser link signal using the Ethernet communication protocol to obtain a data stream electrical signal;

[0143] The modulation module 72 is used to modulate the data stream electrical signal to obtain an optical signal and transmit the optical signal.

[0144] In the technical solution provided by the embodiment of the present application, the satellite directly uses the Ethernet communication protocol to perform baseband processing on the laser link signal, and there is no need to encapsulate the physical frame outside the data link frame, which reduces the overhead of the satellite laser link and improves the carrying efficiency of the satellite laser communication network. In addition, the Ethernet communication protocol has been widely used in ground networks for a long time. The development of the space link communication protocol towards the adaptation of the Ethernet communication protocol is conducive to the sharing of the related industrial chains of the space network and the ground network, and is conducive to the integrated development of the space-ground integrated network.

[0145] In some embodiments, the baseband processing may include: encoding and scrambling processing, FEC encoding and interleaving processing of the Ethernet PHY layer.

[0146] In some embodiments, the satellite may include a space network information processing unit and a laser communication payload; baseband processing is performed by the space network information processing unit; and modulation and transmission are performed by the laser communication payload.

[0147] In some embodiments, the space network information processing unit can convert the data stream electrical signal into serial data; the laser communication payload can convert the serial data into the data stream electrical signal.

[0148] Corresponding to the above-mentioned method for processing intersatellite laser link signals, the embodiment of the present application further provides a device for processing intersatellite laser link signals, such as Figure 8 As shown, the device is applied to a satellite and comprises:

[0149] The demodulation module 81 is used to demodulate the optical signal to obtain a data stream electrical signal;

[0150] The baseband processing module 82 is used to perform baseband processing on the data stream electrical signal using the Ethernet communication protocol to obtain a laser link signal.

[0151] In the technical solution provided by the embodiment of the present application, the satellite directly uses the Ethernet communication protocol to perform baseband processing on the data stream electrical signal, without the need for processing outside the data link frame, which reduces the overhead of the satellite laser link and improves the carrying efficiency of the satellite laser communication network. In addition, the Ethernet communication protocol has been widely used in ground networks for a long time, and the development of the space link communication protocol towards the adaptation of the Ethernet communication protocol is conducive to the sharing of the space network and the ground network related industrial chain, and is conducive to the integrated development of the space-ground integrated network.

[0152] In some embodiments, the baseband processing may include: Ethernet PHY layer decoding and descrambling processing, FEC decoding and deinterleaving processing.

[0153] In some embodiments, the satellite includes a space network information processing unit and a laser communication payload; baseband processing is performed by the space network information processing unit; and demodulation is performed by the laser communication payload.

[0154] In some embodiments, the laser communication payload converts the data stream electrical signal into serial data; and the space network information processing unit converts the serial data into the data stream electrical signal.

[0155] The present application also provides an electronic device, such as the satellite, Fig. 9 As shown, it includes a processor 91, a communication interface 92, a memory 93 and a communication bus 94, wherein the processor 91, the communication interface 92, and the memory 93 communicate with each other through the communication bus 94.

[0156] Memory 93, used for storing computer programs;

[0157] The processor 91 is used to implement any of the above-mentioned methods for processing inter-satellite laser link signals when executing the program stored in the memory 93.

[0158] In the embodiment of the present application, when the processor 91 is used to execute the program stored in the memory 93, the following steps can be implemented: baseband processing of the laser link signal is performed using the Ethernet communication protocol to obtain a data stream electrical signal; the data stream electrical signal is modulated to obtain an optical signal, and the optical signal is emitted.

[0159] In the embodiment of the present application, when the processor 91 is used to execute the program stored in the memory 93, the following steps can also be implemented: demodulating the optical signal to obtain a data stream electrical signal; performing baseband processing on the data stream electrical signal using the Ethernet communication protocol to obtain a laser link signal.

[0160] The communication bus mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0161] The communication interface is used for communication between the above electronic device and other devices.

[0162] The memory may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0163] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0164] In another embodiment provided in the present application, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned methods for processing intersatellite laser link signals are implemented.

[0165] In another embodiment provided by the present application, a computer program product including instructions is also provided, which, when executed on a computer, enables the computer to execute any of the intersatellite laser link signal processing methods in the above embodiments.

[0166] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive Solid State Disk (SSD)), etc.

[0167] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0168] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and equipment embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0169] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A method for processing intersatellite laser link signals, characterized in that: Applied to a satellite, the method comprises: The Ethernet communication protocol is used to perform baseband processing on the laser link signal to obtain a data stream electrical signal; The data stream electrical signal is modulated to obtain an optical signal, and the optical signal is emitted.

2. The method according to claim 1, characterized in that The baseband processing comprises: Ethernet PHY layer encoding and scrambling, FEC encoding and interleaving.

3. The method according to claim 1, characterized in that The satellite includes a space network information processing unit and a laser communication payload; The baseband processing is performed by the spatial network information processing unit; The modulation and transmission are performed by the laser communication payload.

4. The method according to claim 3, characterized in that The spatial network information processing unit converts the data stream electrical signal into serial data; The laser communication payload converts the serial data into the data stream electrical signal.

5. A method for processing intersatellite laser link signals, characterized in that: Applied to a satellite, the method comprises: Demodulate the optical signal to obtain a data stream electrical signal; The data stream electrical signal is baseband processed using an Ethernet communication protocol to obtain a laser link signal.

6. The method according to claim 5, characterized in that The baseband processing comprises: Ethernet PHY layer decoding and descrambling, FEC decoding and deinterleaving.

7. The method according to claim 5, characterized in that The satellite includes a space network information processing unit and a laser communication payload; The baseband processing is performed by the spatial network information processing unit; The demodulation is performed by the laser communication payload; The laser communication payload converts the data stream electrical signal into serial data; The spatial network information processing unit converts the serial data into the data stream electrical signal.

8. A processing device for intersatellite laser link signals, characterized in that: Applied to a satellite, the device comprises: A baseband processing module, used to perform baseband processing on the laser link signal using an Ethernet communication protocol to obtain a data stream electrical signal; The modulation module is used to modulate the data stream electrical signal to obtain an optical signal and transmit the optical signal.

9. A processing device for intersatellite laser link signals, characterized in that: Applied to a satellite, the device comprises: A demodulation module, used to demodulate the optical signal to obtain a data stream electrical signal; The baseband processing module is used to perform baseband processing on the data stream electrical signal using an Ethernet communication protocol to obtain a laser link signal.

10. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, for implementing the method steps described in any one of claims 1 to 4 or claims 5 to 7 when executing a program stored in a memory.

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