Method and system for processing and positioning high-concurrency signals of communication and guide integrated satellite internet of things

Abstract

The invention relates to a high-concurrency signal processing and positioning method and a high-concurrency signal processing and positioning system for a communication and guide integrated satellite internet of things. The method comprises the following steps: uploading a reverse signal generated by user equipment to a satellite network for signal processing according to a communication service demand to obtain a data packet; and sending the data packet to a ground station for labeling through different satellites in the satellite-ground high-speed data transmission link satellite network, and transmitting the data packet to a corresponding capture unit to execute sampling operation to obtain capture information. And scheduling signal demodulation according to the captured information and a demodulation channel resource utilization rate of a high-density signal processing unit of the ground station, so that the ground station transmits an encrypted data packet to a satellite network for secondary processing, and outputs a forward signal. And the user equipment determines a processing mode according to the number of satellites corresponding to the forward signal and a communication service demand, and completes receiving processing and positioning of the concurrent forward signal. By adopting the method, the satellite Internet of Things high-concurrency signal processing with the ultrahigh-concurrency service and the high-precision positioning and timing function can be taken into consideration at the same time.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a high-concurrency signal processing and positioning method and system for a satellite Internet of Things (IoT) integrated with satellite communications and navigation. Background Art

[0002] The combination of active service (RDSS: Radio Determination Satellite Service) and passive service (RNSS) is the biggest feature and highlight of the BeiDou satellite navigation system, and it is also the advantage of the BeiDou system compared with other satellite navigation systems. The BeiDou system mainly provides two types of services, RDSS and RNSS. Among them, RNSS service provides basic navigation, positioning, timing and enhancement services, and RDSS service, also known as positioning reporting service, is the part of BeiDou that provides location reporting and short message communication services. Beidou RDSS service is jointly completed by the space segment, operation and control segment, and user segment. The space segment contains RDSS transponder payloads carried by multiple Beidou GEO (Geostationary Earth Orbit) satellites; the operation and control segment is the ground station, which completes user signal transmission and reception measurement and information transmission and reception processing, and manages and controls the operation of the entire system. The ground station is the measurement core and communication hub for realizing RDSS service; the user segment is various RDSS user terminals, that is, user equipment terminals with satellite message receiving and sending functions, which receive data services and control messages sent from satellites, and send uplink inbound messages to satellites to realize communication, two-way positioning and timing and other functions.

[0003] The business process of RDSS satellite communication is as follows: the user sends an inbound signal containing a communication message, which is forwarded by the satellite to the ground station. The ground station completes signal capture, tracking, demodulation and decoding, and communication processing, and then sends the outbound message to the recipient via the satellite.

[0004] The timing principle of RDSS two-way positioning is: the ranging method of the system is to use timing to achieve the purpose of ranging, that is, to measure the spatial propagation delay required for the satellite to transmit the outbound signal to receive the corresponding user equipment response signal. , and the distance between the user and the satellite is calculated d :

[0005] Its service process: the user equipment sends a reverse signal containing a two-way positioning request message. The inbound signal will be received by multiple satellites and / or multiple beams, and transparently forwarded or regeneratively forwarded to the ground center station, and received by the antenna of the ground center station. The ground station calculates the spatial propagation delay required for the four-stage journey (ground station->satellite->user equipment->satellite->ground station) of each signal of the same user , and then locate the user's position based on the satellite ephemeris information using the three-circle intersection principle. The observation equation contains multiple errors: satellite transponder delay error, ionosphere delay error, troposphere delay error, ground station transceiver link zero value, receiver zero value, etc. The Beidou RDSS short message system can realize both two-way message communication and positioning and timing, and is an integrated satellite Internet of Things system.

[0006] With the continuous growth of demand for mobile communication services and the continuous development of communication technology, ubiquitous coverage and the interconnection of all things have gradually become the basic capabilities required for 5G evolution networks and even future 6G networks. In the future, the new generation of Beidou system will build a national integrated PNT system that will adopt a signal system that integrates communication and navigation, a hybrid constellation architecture of high, medium and low orbits, a space-time benchmark that integrates the sky and the earth, and a space-time integrated network. It can not only realize communication services for a large number of users, but also realize high-precision positioning of a large number of users. The space segment consists of a satellite constellation of several satellites, which can be GEO, MEO (Medium Earth Orbit), and LEO (Low Earth Orbit). Each satellite can transparently forward or regenerate the reverse signal sent by the user to the ground control center, and can also transparently forward or regenerate the forward signal sent by the ground center station to the user terminal. In addition, the satellite transmits communication data to the recipient through an inter-satellite link or a satellite-to-ground data transmission link.

[0007] Currently, 3GPP has defined two architecture modes for IoT satellites, namely transparent forwarding mode and on-board regeneration mode.

[0008] In the transparent forwarding mode architecture, the satellite acts as a repeater, providing RF relay forwarding functions without any signal processing. The data stream is transparently forwarded between the physical satellite and the ground central station to achieve communication signal transmission between the ground user equipment and the ground central station. Therefore, the transparent forwarding mode can also simply regard the satellite as the RF extension between the user terminal and the base station in the ground mobile system. The advantages of this architecture mode are simple implementation and mature engineering, but the disadvantages are: first, the analog signal is susceptible to interference, and the signal quality will decrease with the increase of distance; second, for users with two-way positioning or timing requirements, the positioning or timing errors include: ground central station pseudorange measurement error, satellite repeater zero value, ephemeris error, troposphere / ionosphere model error, central station receiving link zero value, etc. These errors will lead to a decrease in the timing accuracy of two-way positioning.

[0009] In the on-board regeneration mode architecture, the satellite integrates base station functions, including data processing, forwarding and routing functions, to form an on-board base station. Under this architecture, ground user equipment can communicate directly with the satellite, and the processing unit on the satellite performs frequency conversion, AD conversion, demodulation and decoding, and communication processing on the signal, and then transmits the data back to the ground or forwards it to other satellites after encoding, modulation, DA conversion, frequency conversion, and amplification. This architecture has the characteristics of low latency, high bandwidth, and flexible networking, and has better anti-interference ability and lower bit error rate compared to the transparent forwarding mode, because digital signals can detect and correct errors through mechanisms such as error correction codes and check codes. However, the problems faced by this architecture are: First, in the scenario of high concurrent access of massive users of the satellite Internet of Things, such as emergency rescue, the concurrent access may be as high as hundreds to thousands of communication requests. Due to the limited processing capacity on the satellite, it is difficult to complete the reception and processing of massive concurrent signals on the satellite, resulting in communication congestion. Second, compared with the transparent forwarding mode, the on-board regeneration mode has high technical complexity and satellite cost, and low reliability.

[0010] It can be seen that the transparent forwarding mode and the on-board regeneration mode have some shortcomings when facing the high concurrent communication needs of massive users and the high-precision positioning and timing needs. Therefore, it is necessary to design a new IoT satellite architecture and processing method that can take into account both massive concurrent access and high-precision two-way positioning and timing functions. Summary of the invention

[0011] Based on this, it is necessary to provide a high-concurrency signal processing and positioning method and system for an integrated satellite Internet of Things that can take into account both ultra-high concurrency services and high-precision positioning and timing functions in order to address the above-mentioned technical problems.

[0012] A high-concurrency signal processing and positioning method for a satellite Internet of Things with integrated communication and navigation is applied to the satellite Internet of Things with integrated communication and navigation. The satellite Internet of Things includes: user equipment, satellite networking and ground-based private networks. The ground-based private network includes several ground stations. The method includes: According to the communication service requirements, several reverse signals are generated through the user equipment, and the reverse signals are uploaded to the satellite network for signal processing to obtain data packets.

[0013] Data packets are sent from different satellites in the satellite networking to the ground station for marking via the satellite-to-ground high-speed data transmission link, and the marked data packets are transmitted to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0014] The demodulation channel at the current moment is scheduled according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0015] The processing mode of the forward signal is determined according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes the reception processing and positioning of the concurrent forward signal according to the processing mode.

[0016] A high-concurrency signal processing and positioning system for a satellite Internet of Things with integrated communication and navigation is applied to the satellite Internet of Things with integrated communication and navigation. The satellite Internet of Things includes: user equipment, satellite networking and ground-based private networks. The ground-based private network includes several ground stations. The system includes: The reverse signal satellite processing module is used to generate a number of reverse signals through user equipment according to communication service requirements, and upload the reverse signals to the satellite network for signal processing to obtain data packets.

[0017] The capture information acquisition module is used to send data packets from different satellites in the satellite networking to the ground station for marking through the satellite-to-ground high-speed data transmission link, and transmit the marked data packets to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0018] The forward signal generation module is used to schedule the demodulation channel at the current moment according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0019] The signal concurrent processing and positioning module is used to determine the processing mode of the forward signal according to the number of satellites corresponding to the forward signal and the communication service requirements. The user equipment completes the reception processing and positioning of the concurrent forward signal according to the processing mode.

[0020] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented: According to the communication service requirements, several reverse signals are generated through the user equipment, and the reverse signals are uploaded to the satellite network for signal processing to obtain data packets.

[0021] Data packets are sent from different satellites in the satellite networking to the ground station for marking via the satellite-to-ground high-speed data transmission link, and the marked data packets are transmitted to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0022] The demodulation channel at the current moment is scheduled according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0023] The processing mode of the forward signal is determined according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes the reception processing and positioning of the concurrent forward signal according to the processing mode.

[0024] The above-mentioned satellite Internet of Things high-concurrency signal processing and positioning method and system for communication and navigation integration, first of all, adopts a distributed processing strategy. The user equipment generates a reverse signal according to the communication service requirements and uploads it to the satellite network, and the satellite network performs preliminary signal processing to obtain a data packet. This method of distributing signal processing tasks to satellite networking and ground-based private networks reduces the processing pressure on the satellite and avoids the communication congestion problem caused by limited processing capacity on the satellite. In scenarios such as emergency rescue, even if there are hundreds to thousands of communication requests accessed concurrently, they can be processed in an orderly manner through this distributed processing mechanism. Secondly, the ground station plays a key role in signal processing. After the data packet is sent to the ground station through the satellite-to-ground high-speed data transmission link, the ground station marks it and then transmits it to the capture unit for sampling calculation to obtain the capture information of the reverse signal. The ground station has a more powerful processing capability and can efficiently complete this series of operations. At the same time, the demodulation channel is scheduled according to the capture information and the demodulation channel resource load status of the high-density signal processing unit, which further optimizes the processing process and ensures the efficiency and stability of signal processing. Furthermore, the scheme adopts a secondary signal processing mechanism. The ground station transmits the encrypted data packet to the satellite network for secondary signal processing and outputs the forward signal to the user device. This method combines the advantages of satellite and ground, taking advantage of the wide coverage of satellites and the powerful processing capabilities of ground stations, avoiding the problems of high technical complexity, high cost and low reliability brought about by the simple use of on-board regeneration mode. Finally, the processing mode is determined according to the number of satellites corresponding to the forward signal and the communication service requirements, and the user device can complete the reception, processing and positioning of the concurrent forward signal according to the processing mode. This flexible processing mode enables the system to adapt to different business needs, while achieving ultra-high concurrent business processing, ensuring high-precision positioning and timing functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an application scenario diagram of a communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning method in one embodiment; Figure 2 A schematic diagram of a flow chart of a high-concurrency signal processing and positioning method for a satellite Internet of Things with integrated communication and navigation in one embodiment; Figure 3 A schematic diagram of the satellite composition of the satellite Internet of Things with ultra-high concurrent communication and navigation integration in one embodiment; Figure 4 A schematic diagram of a baseband data packet format carrying satellite absolute time in one embodiment; Figure 5 Schematic diagram of the ground station reverse signal receiving link architecture in one embodiment Figure 6 A schematic diagram of the composition of a user equipment in an embodiment; Figure 7 is a workflow diagram of a channel resource scheduling module in one embodiment; Figure 8 A schematic diagram of a baseband data packet format carrying capture information in one embodiment; Fig. 9 A schematic diagram of a forward signal processing flow in one embodiment; Fig.10 A schematic diagram of a forward signal format for communication and guidance in one embodiment; Fig.11 A working principle diagram of passive positioning using a forward signal with integrated communication and guidance in one embodiment Fig.12 A working principle diagram of two-way timing positioning in which digital baseband data packets of the same user are sent to the same ground station via satellite-to-ground high-speed data transmission links of different satellites in one embodiment; Fig.13 A schematic diagram of the bidirectional timing positioning operation in which the digital baseband data packets of the same user are sent to different ground stations via different satellite-to-ground high-speed data transmission links in one embodiment. Fig.14 It is a structural block diagram of a high-concurrency signal processing and positioning system for satellite Internet of Things with integrated communication and navigation in one embodiment; Fig.15 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning method provided by the present invention can be applied to Figure 1The application environment of the satellite-to-ground coordinated system of integrated communication and navigation satellite Internet of Things is shown in the figure. The system consists of user equipment, satellites and ground stations. User equipment refers to user equipment terminals with satellite message receiving and sending functions, which receive data services and control messages from ground stations, send inbound messages in a random access manner, and realize positioning, timing, communication and other functions. Satellites can be composed of satellite constellations at different orbital altitudes. These satellites receive and regenerate forward signals sent by ground stations through satellite-to-ground high-speed data transmission links, and send digital baseband signals of inbound users to ground stations through satellite-to-ground high-speed data transmission links. Satellites also have certain inbound anti-interference and outbound anti-spoofing capabilities. The ground station completes the user signal receiving and sending measurement and information receiving and sending processing, and manages and controls the operation of the entire system.

[0028] In one embodiment, Figure 2 As shown, a high-concurrency signal processing and positioning method for satellite Internet of Things with integrated communication and navigation is provided, and the method is applied to Figure 1 The application environment in the example is used to illustrate the following steps: Step 202: Generate a number of reverse signals through the user equipment according to the communication service demand, and upload the reverse signals to the satellite network for signal processing to obtain data packets.

[0029] Step 204, data packets are sent from different satellites in the satellite networking to the ground station via the satellite-to-ground high-speed data transmission link for marking, and the marked data packets are transmitted to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0030] Step 206, schedule the demodulation channel at the current moment according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0031] Step 208, determining a processing mode for the forward signal according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes reception processing and positioning of the concurrent forward signal according to the processing mode.

[0032] In the above-mentioned communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning method, first, a distributed processing strategy is adopted. The user equipment generates a reverse signal according to the communication service demand and uploads it to the satellite network, and the satellite network performs preliminary signal processing to obtain a data packet. This method of distributing signal processing tasks to satellite networking and ground-based private networks reduces the processing pressure on the satellite and avoids the communication congestion problem caused by limited processing capacity on the satellite. In scenarios such as emergency rescue, even if there are hundreds to thousands of communication requests accessed concurrently, they can be processed in an orderly manner through this distributed processing mechanism. Secondly, the ground station plays a key role in signal processing. After the data packet is sent to the ground station through the satellite-to-ground high-speed data transmission link, the ground station marks it and then transmits it to the capture unit for sampling calculation to obtain the capture information of the reverse signal. The ground station has more powerful processing capabilities and can efficiently complete this series of operations. At the same time, the demodulation channel is scheduled according to the capture information and the demodulation channel resource load status of the high-density signal processing unit, which further optimizes the processing process and ensures the efficiency and stability of signal processing. Furthermore, the scheme adopts a secondary signal processing mechanism. The ground station transmits the encrypted data packet to the satellite network for secondary signal processing and outputs the forward signal to the user device. This method combines the advantages of satellite and ground, taking advantage of the wide coverage of satellites and the powerful processing capabilities of ground stations, avoiding the problems of high technical complexity, high cost and low reliability brought about by the simple use of on-board regeneration mode. Finally, the processing mode is determined according to the number of satellites corresponding to the forward signal and the communication service requirements, and the user device can complete the reception, processing and positioning of the concurrent forward signal according to the processing mode. This flexible processing mode enables the system to adapt to different business needs, while achieving ultra-high concurrent business processing, ensuring high-precision positioning and timing functions.

[0033] In one embodiment, the satellite is optimized for regenerative forwarding. For the reverse signal, the satellite only completes the RF front-end processing; for the forward signal, the satellite completes the signal baseband and RF processing. Figure 3 The satellite includes reverse signal processing equipment, forward signal processing equipment and time and frequency equipment, among which: The reverse signal processing equipment consists of a receiving antenna (including a low noise amplifier), an A / D RF sampling module, a digital down-conversion module, a reverse baseband signal framing module with a time stamp, and a satellite-to-ground high-speed digital transmission signal transmission module.

[0034] Specifically, the antenna receives the uplink reverse signal transmitted by the user equipment, inputs it into the A / D RF sampling module, converts the analog signal into a digital signal, and then converts it into an I / Q branch digital baseband signal after passing through the digital down-conversion module.

[0035] Furthermore, the I / Q branch digital baseband signals are combined into continuous data packets in a specified format in the digital framing module. Figure 4It is a baseband data packet format carrying satellite absolute time provided by an embodiment of the present invention. Each data packet first has an IP header, including the destination address and source address, a packing timestamp (week count, seconds within a week, frames within a second), a PPS flag, a Vlan number, a data segment length, a reserved bit, and an IP header CRC check bit. Then there is the data segment area, which is used to store the M sampling point data of the I / Q branch. The size of this area is flexibly planned according to system requirements. Finally, there is the CRC check bit of the entire data packet. The meaning of each telegram is shown in Table 1 below. It should be noted that the baseband data packet format carrying satellite absolute time provided by an embodiment of the present invention is only for illustration, and any change in the order of telegram arrangement, or equivalent replacement or improvement of the telegram falls within the scope of protection of the present invention.

[0036] Table 1 Description of the format of the baseband data packet carrying satellite absolute time

[0037] Furthermore, the week count and seconds within the week in the baseband data packet carrying the satellite absolute time are provided by the on-board time and frequency equipment. The time and frequency equipment consists of a high-precision atomic clock and a time and frequency signal generation module. The satellite can maintain the accuracy of the on-board time through high-precision atomic clocks, satellite-to-ground time calibration and other methods, and provide various types of time and frequency signals required by various modules on the satellite. When the reverse signal is converted from an analog signal to a digital signal on the satellite, the absolute time of each sampling point has been calibrated. Assuming that the sampling rate is P Hz and the number of sampling points stored in a single data packet is M, the absolute time T of the Yth sampling point in any data packet can be calculated using the following formula:

[0038] Furthermore, the baseband data packet carrying the satellite absolute time is input into the satellite-to-ground high-speed data transmission signal transmission module and sent to the ground station through the satellite-to-ground high-speed data transmission link. The satellite-to-ground high-speed data transmission link can use the Ka, Q or V frequency band. The present invention does not limit the frequency band and signal used by the satellite-to-ground high-speed data transmission link.

[0039] Furthermore, the onboard forward signal processing equipment is composed of a satellite-to-ground high-speed data transmission signal receiving module, a forward baseband processing module with a time stamp, an outbound radio frequency processing module, and a transmitting antenna. The satellite-to-ground high-speed data transmission receiving module receives the data transmission signal sent by the ground station and demodulates the outbound message carried. The outbound message completes information authentication, framing, coding, modulation, and encryption in the forward baseband processing module with a time stamp, and then is input into the outbound radio frequency processing module to complete signal D / A conversion and frequency conversion amplification, generating an outbound downlink signal, which is sent to the user equipment via the transmitting antenna.

[0040] In one embodiment, if Figure 5As shown, a ground station reverse signal receiving link architecture is provided, specifically: the ground station reverse signal receiving link consists of satellite-to-ground high-speed data transmission and receiving equipment, a 10G switch, a capture unit, a high-density signal processing unit, and a channel resource scheduling module. The architecture also adopts an optical switching method based on VLAN adaptive configuration, and a signal processing resource pool is composed of multiple capture units and high-density signal processing units. The channel resource scheduling module realizes flexible scheduling of the demodulation channel resources of the signal processing resource pool in the station, thereby realizing the function of fast scheduling and expansion of hardware resources of demodulation channel resources as the number of signals increases. In the traditional receiving architecture, the signal processing demodulation channel resources are fixedly allocated according to the satellite / beam, and the demodulation channel resources cannot be flexibly scheduled and shared between each satellite / beam. In scenarios such as emergency rescue, the rescued users concentrate on sudden service requests in one place, and a large number of user signals are sent at the same time. For example, if there are thousands of users online at the same time on a certain satellite / reverse beam, the channel resources of the satellite / beam may be blocked and normal services cannot be provided. In order to solve the communication congestion problem in hot spots, the satellite-to-ground high-speed data transmission and receiving equipment, capture unit, and high-density signal processing unit in the ground station of the present invention are all connected to the 10G switch, and the VLAN of the 10G switch is configured on demand to solve the fast capture and allocation needs of large-capacity users. The specific signal processing process is as follows: Step 11: The ground station receives data packets sent from N (N≥1) different satellites / beams, and tags the data packets from different satellites / beams with the Vlan labels corresponding to the capture units connected to the 10G switch, that is, the data packets from different satellites / beams are forwarded to the designated capture units through the 10G switch. For example: the Vlan number of the 10G switch port connected to a capture unit is configured as vlan1, vlan2, then the 10G switch will send the baseband data packets with vlan1 and vlan2 labels to the capture unit connected to the port.

[0041] Step 12: After receiving the baseband data packet, the capture unit extracts the sampling point data of the data packet, and then splices the data of each sampling point in the order of receiving the data packet to restore it to the form of a sampled data stream. Then, a correlation operation is performed on the sampled data stream. The correlation operation refers to the process of using a user's local spread spectrum code and the sampled data stream to perform bit-by-bit XOR operations, and then adding the operation results of each bit to obtain a correlation peak. If the correlation peak is greater than or equal to a preset threshold, it is determined that the synchronization head of the user's reverse signal is captured, and the starting sampling point of this correlation operation is used as the starting position of the user's synchronization head. Each correlation operation starts with a sampling point in the sampled data segment, and after completion, moves to the next sampling point as the operation starting point, and so on.

[0042] Step 13: The capture unit frames the capture information of multiple users, including I / Q sampling point data, synchronization header start position, Doppler frequency deviation information, etc., and sends it to the 10 Gigabit switch. Figure 8 It is a baseband data packet format carrying capture information provided by an embodiment of the present invention. Each data packet first has an IP header, including the destination address and source address, a packing timestamp (week count, seconds within a week, frames within a second), a PPS flag, a Vlan number, a data segment length, a capture allocation strategy (the number of high-density signal processing units allocated for capture, the number of each high-density signal processing unit), and an IP header CRC check bit. Then there is a data segment area, which is used to store the I / Q branch baseband data of M sampling points and the capture information of each sampling point, including a synchronization header indication and a Doppler frequency shift. Finally, there is the CRC check bit of the entire data packet.

[0043] It should be noted that the baseband data packet format carrying the capture information provided in the embodiment of the present invention is only for illustration, and any change in the order of the message arrangement, or equivalent replacement or improvement of the message falls within the protection scope of the present invention. The meaning of each message is shown in Table 2 below: Table 2 Description of the format of the baseband data packet carrying capture information

[0044] In one embodiment, if Figure 6 As shown, a user equipment is provided, which is composed of a transceiver isolation antenna, a radio frequency transceiver module, a baseband signal processing module, and an information processing module. The transceiver isolation antenna is used to receive the downlink forward signal transmitted by the satellite and transmit the uplink reverse signal. The radio frequency receiving module completes the down-conversion, AD analog-to-digital conversion, filtering and amplification of the forward signal. The baseband signal processing module has multiple receiving channels and one transmitting channel. The receiving channel can receive the forward signals broadcast by multiple satellites in parallel, and obtain the frame number, broadcast information, user message and other information carried in the satellite forward signal by demodulating the message of the forward signal; and obtain the pseudo-range measurement value of the forward signal by measuring the satellite forward signal. The transmitting channel can receive the user inbound message sent by the information processing module, and generate a digital baseband reverse signal after framing, encoding and modulation according to different service types. After receiving the digital baseband reverse signal, the radio frequency transmitting module completes DA conversion, up-conversion, filtering and amplification, and then outputs the radio frequency signal to the transceiver isolation antenna for transmission.

[0045] Furthermore, when the user equipment only has communication needs, it only needs to demodulate the message of the forward signal to obtain the message of its own user carried in the forward signal of the satellite. When the user equipment has positioning timing needs, different modes can be selected according to the current received signal status and positioning timing accuracy requirements. If the user equipment has high requirements for positioning timing accuracy (for example, positioning accuracy ≤10m, timing accuracy ≤5ns), a two-way positioning timing mode can be used, that is, after the user equipment synchronizes with the forward signal of a certain satellite, it sends a two-way positioning request signal to the satellite at the reference time mark of a certain frame of the forward signal of the satellite. The signal needs to carry the outbound frame number of the satellite in response; the ground station receives the baseband sampling data forwarded to the ground station by ≥2 satellites, and the ground station calculates the user position and sends the user position information to the recipient. If the user equipment can receive forward signals from ≥4 satellites, the user equipment can also adopt the passive positioning mode, that is, the user equipment measures the pseudo-range values ​​of different satellite forward signals reaching the user equipment, and then locates its own position based on the satellite ephemeris or satellite position information carried in each forward signal using the three-circle intersection principle.

[0046] It should be noted that the drawings and related descriptions are only for illustrating the principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, the message names and entities in the embodiments of the present invention may vary depending on the network, and some messages may be omitted. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention. Although the present invention has been illustrated and described with reference to the embodiments of the present invention, it should be understood by those skilled in the art that various changes may be made to it in form and detail without departing from the spirit and scope of the present invention.

[0047] In one embodiment, if Figure 7 As shown, a workflow of a channel resource scheduling module is provided to capture the processing of allocation strategies. The specific steps are as follows: Step 21: First, each capture unit counts the number of user synchronization headers captured per unit time and periodically reports it to the resource scheduling module; each high-density signal processing unit also periodically reports its demodulation channel resource utilization to the resource scheduling module.

[0048] Step 22: The resource scheduling module schedules one or more relatively idle high-density signal processing units to jointly process the inbound data of satellites / beams in a certain communication hotspot area according to the number of synchronization heads captured by each satellite and each beam and the demodulation channel resource load status of the high-density signal processing unit, and forms a scheduling instruction. The specific operations include: 1) The resource scheduling module sends instructions to the capture unit, informing it of the number of high-density signal processing units involved in signal demodulation and decoding, as well as their device numbers.

[0049] 2) The capture unit writes the number of high-density signal processing units participating in the capture allocation and their device numbers into the IP packet header of the baseband data packet carrying the capture information, and forwards the baseband data packet carrying the capture information to the high-density signal processing terminal through the 10 Gigabit switch.

[0050] 3) The resource scheduling module sends instructions to the high-density signal processing unit that is allocated for capture, informing it of the VLAN number of the data packet that needs to be processed.

[0051] 4) The high-density signal processing unit selects the baseband data packets of the specified Vlan, obtains the number of high-density signal processing units participating in the capture and allocation from the IP packet header, and obtains the order of the device according to the high-density signal processing unit device number in the IP packet header. The high-density signal processing unit can determine the reverse signal to be processed. For example, assuming that a baseband data packet has M sampling point data, and the number of high-density signal processing units participating in the capture and allocation is U, then the i-th high-density signal processing unit needs to process the synchronization header starting position at The inverse signal of the sampling point.

[0052] Step 23: After receiving the baseband data packet carrying the capture information, the high-density signal processing unit extracts the I / Q branch sampling point data of the data packet, and then splices the data of each sampling point in the order of receiving the data packets to restore it to the form of a sampling data stream. Then, the synchronization header information of the reverse signal to be processed is extracted and allocated to each demodulation channel. Each demodulation channel completes the tracking and decoding of one reverse signal.

[0053] Step 24: If a single ground station does not have enough demodulation channel resources, the baseband data packets corresponding to lower priority users or services with lower latency requirements can be sent through the ground private network to other ground stations with surplus demodulation resources for demodulation and decoding processing, and then the decoded telegrams are sent back to the original ground station, thereby realizing the sharing of computing power resources among multiple ground stations.

[0054] In one embodiment, if Fig. 9 As shown, a forward signal processing flow is provided, and the specific steps are as follows: Step 31: The ground station securely encrypts and authenticates the outbound message, and then uploads it to the satellite via the satellite-to-ground high-speed data transmission link.

[0055] Step 32: The satellite's high-speed data transmission receiving module performs down-conversion, filtering, sampling, demodulation and decoding, CRC check, and authentication on the received signal; only the information that passes the CRC check and authentication can enter step 33, and the outbound message that fails is considered an illegal signal and is discarded.

[0056] Step 33: The satellite groups the authenticated outbound messages according to the number of bits that can be carried in each frame, and adds the forward signal transmission time (week count, seconds within the week), frame number, ephemeris and other information, and performs framing, coding, modulation, DA conversion, up-conversion and power amplification according to the air interface protocol, and sends it to the user equipment through the satellite transmitting antenna at the specified time. Fig.10 It is a forward signal format that integrates communication and guidance provided by an embodiment of the present invention.

[0057] Step 34: After receiving the forward signal, the user equipment demodulates its own message.

[0058] In addition, user equipment can use the integrated forward signal to achieve passive positioning, such as Fig.11 When the user equipment can correctly receive forward signals from no less than four satellites, it can use the week count, second in week, and frame number carried in the forward signal to obtain the accurate forward signal transmission time, and then use the ephemeris information carried in the forward signal to obtain the satellite position at the time of forward signal transmission, and finally use the three-sphere interaction principle to calculate its own position.

[0059] In one embodiment, a plurality of user inbound telegrams are received through a baseband signal processing module of a user device according to communication service requirements, and the telegrams are framed, encoded and modulated to generate a plurality of digital baseband reverse signals. The digital baseband reverse signal is subjected to DA conversion, up-conversion and filtering and amplification processing by the radio frequency transceiver module of the user device, and then the reverse signal after radio frequency is uploaded to the satellite network, and the reverse signal processing equipment of the satellite network performs A / D radio frequency sampling, digital down-conversion and digital framing to obtain a data packet. The data packet contains the source address, the destination address, the packaging timestamp, the Vlan number, the digital baseband reverse signal of the sampling point and the CRC check.

[0060] In one embodiment, data packets are sent to the ground station from different satellites in the satellite network through the satellite-to-ground high-speed data transmission link. The ground station adds different Vlan tags according to the data packets of different satellites, and transmits the data packets marked with Vlan tags to the corresponding capture unit to extract the sampling point data of the data packets marked with Vlan tags, and splices each sampling point data according to the order of receiving the data packets marked with Vlan tags to obtain a sampled data stream. After the sampled data stream and the local spread spectrum code of the corresponding user equipment are subjected to bit-by-bit XOR operation, the operation results of each bit are added to obtain a related peak value. If the related peak value is greater than or equal to a preset threshold, it is determined that the synchronization head of the current reverse signal has been captured, and the starting sampling point of the current operation is used as the starting position of the synchronization head. After completing the current sampling operation, move to the next sampling point as the operation starting point until all data segments in the sampled data stream complete the sampling operation. The capture information of the reverse signal is obtained according to the result of the sampling operation, the header of the data packet marked with Vlan tags, and the CRC check bit of the data packet marked with Vlan tags.

[0061] In one embodiment, the header of the data packet marked with the Vlan tag includes: destination address, source address, packing timestamp, Vlan, data segment length, capture allocation strategy, IP header and CRC check bit. The capture allocation strategy is used for each capture unit to count the number of synchronization headers of the data packets marked with the Vlan tag captured within a unit time, report the number of synchronization headers to the resource scheduling module of the ground station to generate a scheduling instruction, coordinate the demodulation channel resources of the ground station according to the scheduling instruction, and if the demodulation channel resources of the current ground station are insufficient, arrange the baseband data packets with lower priority or the baseband data packets corresponding to the services with lower latency requirements to be sent to the next ground station with sufficient demodulation resources through the ground private network for demodulation and decoding processing, and send the decoded telegram to the current ground station.

[0062] In one embodiment, the communication service requirements include: communication transmission and high-precision positioning timing. The user equipment has multiple receiving channels and is composed of a transceiver isolation antenna, a radio frequency transceiver module, a baseband signal processing module, and an information processing module. The satellite includes: a reverse signal processing device, a forward signal processing device, and a time and frequency device. The ground station is composed of a satellite-to-ground high-speed data transmission and reception device, a 10 Gigabit switch, a capture unit, a high-density signal processing unit, and a channel resource module. The captured information includes: the number of packet headers and synchronization headers of data packets marked with Vlan tags.

[0063] In one of the embodiments, the number of synchronization heads and the current demodulation channel resource load status of the high-density signal processing unit of the ground station are periodically uploaded to the resource scheduling module according to the capture allocation strategy in the capture information. After the resource scheduling module schedules one or more idle high-density signal processing units in the ground private network to jointly process the data packet currently marked with the VLAN tag, a scheduling instruction is generated so that the ground station performs secure encryption and authentication operations on the current data packet marked with the VLAN tag at a preset time, and then transmits it to the satellite network through the satellite-to-ground high-speed data transmission link. The satellite in the satellite network performs secondary signal processing such as down-conversion, filtering, demodulation and decoding, CRC check, and authentication on the received signal to obtain a forward signal carrying the transmission time information, and output the forward signal to the user equipment.

[0064] In one embodiment, when the communication service requirement of the user equipment is communication transmission, a communication request signal is generated randomly or at a preset time, and a message of a forward signal is demodulated. When the communication service requirement of the user equipment is high-precision positioning and timing, if the current user equipment receives forward signals from no less than 4 satellites, the positioning information of the user equipment is obtained by using the transmission time information carried by the forward signal and adopting the three-ball interaction principle. If the ground station receives data packets from no less than 2 satellites, the ground station calculates the time when the multi-path signals of the same user equipment arrive at different satellites, obtains the two-way delay of the signal propagation between the satellite and the user equipment, and obtains the positioning information of the user equipment by adopting the three-ball interaction principle based on the two-way delay and the position information of each satellite.

[0065] It is worth noting that compared with the traditional RDSS bidirectional positioning, the satellite IoT ultra-high concurrent communication and navigation integrated satellite system provided by the present invention can improve the accuracy of bidirectional positioning. The processing flow is as follows: Step 1: The user equipment sends a bidirectional positioning request signal including a response satellite number and a response forward frame number, and the signal is received by multiple satellites; Step 2: The satellite converts the reverse RF signal into a baseband data packet carrying the satellite absolute time, and then sends it to the ground station via the satellite-to-ground high-speed data transmission link, and is received by the antenna of the ground station. The digital baseband data packets of the same user are sent to the same ground station via the satellite-to-ground high-speed data transmission links of different satellites, such as Fig.12 As shown; it can also be sent to different ground stations via different satellites' high-speed data transmission links, such as Fig.13 As shown; Step 3: The ground station captures, tracks, demodulates, and processes the baseband data packets carrying the satellite absolute time to obtain the time when the user arrives at each satellite. At the same time, the position of the satellite is calculated through the ephemeris, from which the following observation equation can be obtained.

[0066]

[0067]

[0068]

[0069]

[0070] Where t0 is the time when satellite 1 transmits the outbound frame, which can be obtained from the week count, second in week and frame number carried in the satellite outbound frame; t1 is the time when the user receives the outbound frame, U t1 (X,Y,Z) is the user's position at time t1, S1, t1 (X, Y, Z) is the position of satellite 1 at time t1, t2 is the time when satellite 1 receives the user's inbound frame, and t3 is the time when satellite 2 receives the user's inbound frame. t2 and t3 can be obtained from the synchronization header capture information. It is the user machine zero value; is the additional atmospheric transmission delay from satellite 1 to the user terminal, Additional atmospheric transmission delay from user terminal to satellite 1; There is additional delay in atmospheric transmission from the user terminal to satellite 2; c is the speed of light in a vacuum. is the position of the user machine in the geocentric, earth-fixed coordinates at time t1, is the position of satellite 1 at time t0, converted to Earth-centered, Earth-fixed coordinates at time t1; is the position of satellite 1 at time t3, converted to Earth-centered Earth-fixed coordinates at time t2, is the position of satellite 2 at time t3, converted to Earth-centered Earth-fixed coordinates at time t2, is the position of the user machine in the Earth-centered Earth-fixed coordinates at time t2, N is the radius of curvature of the reference ellipsoid, a is the semi-major axis of the Earth, and e is the eccentricity of the ellipsoid.

[0071] Step 4: All ground stations send user positioning information, including observation equations, user ID numbers, response satellite numbers, and response forward frame numbers, to the designated positioning processing server through the ground private network. The positioning processing server matches user positioning information from different ground stations based on the user ID number, response satellite number, and response forward frame number. Then, the observation equation is solved using the least square method to obtain the user device location.

[0072] In the present invention, since the reverse signal has been converted from an analog signal to a digital signal on the satellite and each data packet is timestamped, and the forward signal is also generated on the satellite and marked with the time when the forward signal is transmitted, that is, the time when the reverse signal arrives at the satellite and the time when the forward signal is transmitted from the satellite have been calibrated, the two-way positioning timing error does not include the ionosphere and troposphere delay errors between the satellite and the ground station, the satellite transponder delay error, and the ground station transceiver link zero value, thereby improving the two-way positioning accuracy.

[0073] Considering that different satellites, especially low-orbit satellites, have different visible ground stations at the same time, the digital baseband data packets of the same user are sent to different ground stations via different satellites. In order to complete the user positioning service, multiple ground stations need to collaborate to perform positioning solutions, that is, different ground stations need to send the positioning information of each user through the ground private network to the designated positioning processing server, which will fuse the multi-satellite data to achieve joint positioning solutions.

[0074] It should be understood that although Figure 1 , Figure 7 , Fig. 9 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 , Figure 7 , Fig. 9 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0075] In one embodiment, Fig.14 As shown, a high-concurrency signal processing and positioning system for satellite Internet of Things with integrated communication and navigation is provided, which is applied to the satellite Internet of Things with integrated communication and navigation. The satellite Internet of Things includes: user equipment, satellite networking and ground-based private network. Among them, the ground-based private network includes several ground stations. The system includes: a reverse signal satellite processing module 1402, a capture information acquisition module 1404, a forward signal generation module 1406 and a signal concurrent processing and positioning module 1408, wherein: The reverse signal satellite processing module 1402 is used to generate a number of reverse signals through the user equipment according to the communication service requirements, and upload the reverse signals to the satellite network for signal processing to obtain data packets.

[0076] The capture information acquisition module 1404 is used to send data packets from different satellites in the satellite networking to the ground station for marking through the satellite-to-ground high-speed data transmission link, and transmit the marked data packets to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0077] The forward signal generation module 1406 is used to schedule the demodulation channel at the current moment according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0078] The signal concurrent processing and positioning module 1408 is used to determine the processing mode of the forward signal according to the number of satellites corresponding to the forward signal and the communication service demand. The user equipment completes the reception processing and positioning of the concurrent forward signal according to the processing mode.

[0079] For the specific definition of the communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning system, please refer to the definition of the communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning method above, which will not be repeated here. Each module in the above-mentioned communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning system can be implemented in whole or in part through software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0080] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.15 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input system connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a high-concurrency signal processing and positioning method for a satellite Internet of Things with integrated communication and navigation is realized. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input system of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0081] Those skilled in the art will understand that Figure 3 , Figure 5-Figure 6 , Figure 14-15 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0082] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented: According to the communication service requirements, a number of reverse signals are generated by the user equipment, and the reverse signals are uploaded to the satellite network for signal processing to obtain data packets.

[0083] Data packets are sent from different satellites in the satellite networking to the ground station for marking via the satellite-to-ground high-speed data transmission link, and the marked data packets are transmitted to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal.

[0084] The demodulation channel at the current moment is scheduled according to the captured information and the demodulation channel resource load status of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at the preset time, performs secondary signal processing, and outputs the forward signal to the user equipment.

[0085] The processing mode of the forward signal is determined according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes the reception processing and positioning of the concurrent forward signal according to the processing mode.

[0086] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A communication and navigation integrated satellite Internet of Things high-concurrency signal processing and positioning method, characterized in that: Applied to the integrated satellite Internet of Things, the satellite Internet of Things includes: user equipment, satellite networking and ground private network; wherein the ground private network includes several ground stations; The method comprises: Generate a plurality of reverse signals through the user equipment according to the communication service demand, and upload the reverse signals to the satellite network for signal processing to obtain data packets; The data packets are sent from different satellites in the satellite network to the ground station for marking via a satellite-to-ground high-speed data transmission link, and the marked data packets are transmitted to the corresponding capture unit for sampling calculation to obtain the capture information of the reverse signal; Scheduling the demodulation channel at the current moment according to the capture information and the demodulation channel resource load state of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite network at a preset time, performs secondary signal processing, and outputs a forward signal to the user equipment; The processing mode of the forward signal is determined according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes the reception processing and positioning of the forward signal according to the processing mode.

2. The method according to claim 1, characterized in that: According to the communication service demand, a plurality of reverse signals are generated by the user equipment, and the reverse signals are uploaded to the satellite network for signal processing to obtain data packets, including: According to the communication service requirements, a plurality of user inbound messages are received through the baseband signal processing module of the user equipment, and a plurality of digital baseband reverse signals are generated after framing, encoding and modulating the messages; After the digital baseband reverse signal is subjected to DA conversion, up-conversion, filtering and amplification processing by the radio frequency transceiver module of the user equipment, the reverse signal after radio frequency is uploaded to the satellite network, and the reverse signal processing equipment of the satellite network performs A / D radio frequency sampling, digital down-conversion and digital framing to obtain a data packet; The data packet includes a source address, a destination address, a packing timestamp, a Vlan number, a digital baseband reverse signal of a sampling point, and a CRC check.

3. The method according to claim 2, characterized in that The data packets are sent from different satellites in the satellite network to the ground station for marking via a satellite-to-ground high-speed data transmission link, and the marked data packets are transmitted to a corresponding capture unit for sampling operation to obtain capture information of the reverse signal, including: The data packets are sent from different satellites in the satellite network to the ground station through a satellite-to-ground high-speed data transmission link. The ground station adds different Vlan tags to the data packets from different satellites, transmits the data packets marked with Vlan tags to the corresponding capture unit to extract the sampling point data of the data packets marked with Vlan tags, and splices the data of each sampling point according to the order of receiving the data packets marked with Vlan tags to obtain a sampling data stream; After performing bit-wise XOR operation on the sampled data stream and the local spread spectrum code corresponding to the user equipment, the operation results of each bit are added to obtain a correlation peak value. If the correlation peak value is greater than or equal to a preset threshold, it is determined that the synchronization head of the current reverse signal has been captured, and the starting sampling point of the current operation is used as the starting position of the synchronization head. After completing the current sampling operation, move to the next sampling point as the operation starting point until all data segments in the sampled data stream complete the sampling operation; The capture information of the reverse signal is obtained according to the result of the sampling operation, the header of the data packet marked with the Vlan tag, and the CRC check bit of the data packet marked with the Vlan tag.

4. The method according to claim 3, characterized in that The packet header of the data packet marked with the Vlan tag includes: destination address, source address, packet timestamp, Vlan, data segment length, capture allocation strategy, IP packet header and CRC check bit; The capture allocation strategy is used for each capture unit to count the number of synchronization headers of the data packets marked with VLAN tags captured within a unit time, and report the number of synchronization headers to the resource scheduling module of the ground station to generate a scheduling instruction, and coordinate the demodulation channel resources of the ground station according to the scheduling instruction. If the demodulation channel resources of the current ground station are insufficient, baseband data packets with lower priority or baseband data packets corresponding to services with lower latency requirements are arranged to be sent through the ground private network to the next ground station with sufficient demodulation resources for demodulation and decoding processing, and the decoded telegram is sent to the current ground station.

5. The method according to any one of claims 1 to 4, characterized in that: The communication service requirements include: communication transmission and high-precision positioning and timing; The user equipment has multiple receiving channels and is composed of a transceiver isolation antenna, a radio frequency transceiver module, a baseband signal processing module and an information processing module; The satellite comprises: a reverse signal processing device, a forward signal processing device and a time-frequency device; The ground station is composed of satellite-to-ground high-speed data transmission and receiving equipment, a 10G switch, a capture unit, a high-density signal processing unit and a channel resource module; The captured information includes: the number of packet headers and synchronization headers of the data packets marked with Vlan tags.

6. The method according to claim 5, characterized in that The method includes: scheduling a demodulation channel at a current moment according to the capture information and a demodulation channel resource load state of a high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite networking at a preset time, performs secondary signal processing, and outputs a forward signal to the user equipment, including: According to the capture allocation strategy in the capture information, the number of synchronization heads and the current demodulation channel resource load status of the high-density signal processing unit of the ground station are periodically uploaded to the resource scheduling module. After the resource scheduling module schedules one or more idle high-density signal processing units in the ground private network to jointly process the data packets currently marked with the VLAN tag, a scheduling instruction is generated so that the ground station performs secure encryption and authentication operations on the data packets currently marked with the VLAN tag at a preset time, and then transmits them to the satellite network through the satellite-to-ground high-speed data transmission link. The satellite in the satellite network performs secondary signal processing such as down-conversion, filtering, demodulation and decoding, CRC check and authentication on the received signal to obtain a forward signal carrying the transmission time information, and outputs the forward signal to the user equipment.

7. The method according to claim 6, characterized in that Determining a processing mode of the forward signal according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completing reception processing and positioning of the forward signal according to the processing mode, including: When the communication service demand of the user equipment is communication transmission, a communication request signal is randomly generated or generated at a preset time, and the telegram of the forward signal is demodulated; when the communication service demand of the user equipment is high-precision positioning and timing, if the user equipment currently receives forward signals from no less than 4 satellites, the positioning information of the user equipment is obtained by using the transmission time information carried by the forward signal and adopting the three-ball interaction principle; if the ground station receives data packets from no less than 2 satellites, the ground station calculates the time when multiple signals of the same user equipment arrive at different satellites, obtains the two-way delay of signal propagation between the satellite and the user equipment, and obtains the positioning information of the user equipment by adopting the three-ball interaction principle based on the two-way delay and the position information of each satellite.

8. A satellite IoT high-concurrency signal processing and positioning system with integrated communication and navigation, characterized in that: Applied to satellite Internet of Things, the satellite Internet of Things includes: user equipment, satellite networking and ground private network; wherein the ground private network includes several ground stations; the system includes: A reverse signal satellite processing module, used to generate a plurality of reverse signals through the user equipment according to the communication service requirements, and upload the reverse signals to the satellite network for signal processing to obtain data packets; A capture information acquisition module is used to send the data packets from different satellites in the satellite networking to the ground station for marking through a satellite-to-ground high-speed data transmission link, and transmit the marked data packets to the corresponding capture unit for sampling operation to obtain the capture information of the reverse signal; A forward signal generation module is used to schedule the demodulation channel at the current moment according to the capture information and the demodulation channel resource load state of the high-density signal processing unit of the ground station, so that the ground station transmits the encrypted data packet to the satellite networking at a preset time, performs secondary signal processing, and outputs a forward signal to the user equipment; The signal concurrent processing and positioning module is used to determine the processing mode of the forward signal according to the number of satellites corresponding to the forward signal and the communication service demand, and the user equipment completes the reception processing and positioning of the forward signal concurrently according to the processing mode.

Images