Design method of communication and guidance fusion signal based on 5G non-terrestrial network downlink broadcast

Abstract

The present application proposes a method for designing a communication and navigation fusion signal based on 5G non-terrestrial network downlink broadcast, including: determining navigation message data based on the low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination; generating navigation message blocks based on navigation message data; adding idle symbols after the physical broadcast channel of the synchronization signal block; adding navigation message blocks on idle symbols. The embodiment of the present application adds a navigation message block for positioning the terminal in the downlink broadcast signal in the broadcast signal to achieve dual functions of navigation and communication under the same spectrum resources, improve spectrum utilization efficiency, and measure pseudo-range through the broadcast signal, so that the terminal can be positioned in the synchronization stage, reducing the complexity of positioning and avoiding cumbersome access procedures.

Description

Technical Field

[0001] The present application belongs to the technical field of mobile communications, and specifically relates to a method for designing a communication and guidance fusion signal based on 5G non-terrestrial network downlink broadcast. Background Art

[0002] The communication function and navigation and positioning function of traditional satellites are relatively separated, and the constellations are also deployed independently. In existing research, the measurement criteria for communication and positioning signals vary, and the signal waveforms designed according to their respective criteria differ significantly in specific form and physical characteristics. For example, communication signals use Shannon's information theory as the measurement criterion, and positioning signals use phase or estimated accuracy as the measurement criterion. In traditional signal design, the resource occupation of these signal waveforms with different physical characteristics is independently calculated and planned, and the multiplexing modulation of multi-channel information is generally implemented in the frequency domain, time domain, code domain, spatial domain and other dimensions.

[0003] However, simple multiplexing technology inevitably leads to resource competition among subsystems and signal interference between non-cooperative sub-signals. It can only rely on increasing resources to solve the coexistence problem of multi-functional signals, and it is difficult to meet the rapidly growing functional requirements under the constraints of limited resources. The independent development of communication and navigation systems will inevitably cause a huge waste of resources such as orbits, frequencies, and manufacturing costs. The deep integration at the signal level can save precious public resources and promote the intensive and healthy development of the communication and navigation fields. It has significant social significance and economic value. The integration of communication signals and positioning signals can allow communication and positioning signals to be transmitted on the same frequency, effectively utilizing precious frequency band resources.

[0004] 5G demonstrates a strong synergistic effect between communication and positioning. 5G uses high-frequency or millimeter-wave communications, which have severe penetration loss characteristics. Millimeter-wave communications have very good directionality and can achieve higher-precision ranging and angle measurement. The millimeter waves in the 5G spectrum have an unprecedented large bandwidth in mobile communications, and can therefore provide smaller delays and good positioning capabilities.

[0005] However, the 5G positioning reference signal is not transmitted through the broadcast channel. It must be received and resolved through special scheduling after the user accesses the network, which increases the complexity of positioning. Summary of the invention

[0006] This application proposes a design method for a communication and guidance fusion signal based on 5G non-terrestrial network downlink broadcast, which can solve the technical problem that the current 5G positioning reference signal is not transmitted through a broadcast channel and must be received and resolved through special scheduling after the user accesses the network, which increases the complexity of positioning.

[0007] The first aspect of the present application proposes a method for designing a communication and guidance fusion signal based on 5G non-terrestrial network downlink broadcast, including:

[0008] Determine navigation message data based on the low-orbit predicted orbit generated by precise orbit determination and Beidou augmentation parameters;

[0009] Generate a navigation message block based on the navigation message data;

[0010] Adding an idle symbol after the physical broadcast channel of the synchronization signal block;

[0011] The navigation message block is added to the idle symbol.

[0012] The embodiment of the second aspect of the present application provides a communication and guidance fusion signal design device based on 5G non-terrestrial network downlink broadcast, including:

[0013] A determination module is used to determine navigation message data based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters;

[0014] A generation module, used for generating a navigation message block based on the navigation message data;

[0015] An adding module, configured to add an idle symbol after the physical broadcast channel of the synchronization signal block;

[0016] The adding module is further used to add the navigation message block to the idle symbol.

[0017] An embodiment of the third aspect of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect above.

[0018] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the method described in the first aspect above.

[0019] The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages:

[0020] The present application proposes a method for designing a communication and navigation fusion signal based on 5G non-terrestrial network downlink broadcast, including: determining navigation message data based on the low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination; generating navigation message blocks based on navigation message data; adding idle symbols after the physical broadcast channel of the synchronization signal block; adding navigation message blocks on idle symbols. The embodiment of the present application adds a navigation message block for positioning the terminal in the downlink broadcast signal in the broadcast signal to achieve dual functions of navigation and communication under the same spectrum resources, improve spectrum utilization efficiency, and measure pseudo-range through the broadcast signal, so that the terminal can be positioned in the synchronization stage, reducing the complexity of positioning and avoiding cumbersome access procedures.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 A flow chart of a communication and guidance fusion signal design method based on 5G non-terrestrial network downlink broadcasting provided by an embodiment of the present application is shown;

[0024] Figure 2 A schematic diagram of a downlink synchronization process provided by an embodiment of the present application is shown;

[0025] Figure 3 A schematic diagram of the structure of a communication and conduction fusion signal design device based on 5G non-terrestrial network downlink broadcasting provided by an embodiment of the present application is shown;

[0026] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram of a storage medium provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0029] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0030] The communication and guidance fusion signal design method based on 5G non-terrestrial network downlink broadcasting of the present application can be executed by a computing device, and the computing device applies cloud computing and virtualization technology. The computing device can be a server, such as one server, multiple servers, a server cluster, a cloud computing platform, etc. Optionally, the computing device can also be a terminal device, such as a mobile phone, a tablet computer, a game console, a portable computer, a desktop computer, an advertising machine, an all-in-one machine, etc. The present application does not limit the device type and number of computing devices.

[0031] Based on the above background technology, the non-cooperative navigation positioning of radio signals from low-orbit communication constellations such as Iridium and Starlink can be used to achieve integrated communication and navigation, but additional navigation resources are required; the short message bandwidth of the Beidou system is small and only supports text data transmission at a lower rate, which cannot carry the communication needs of real-time streaming media with large amounts of data. The positioning reference signal (PRS) of 5G is not transmitted through a broadcast channel, but must be received and resolved through special scheduling after the user accesses the network.

[0032] In order to solve the above problems, the present application proposes a method for designing a communication and navigation fusion signal based on 5G non-terrestrial network downlink broadcast, including: determining navigation message data based on the low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination; generating navigation message blocks based on navigation message data; adding idle symbols after the physical broadcast channel of the synchronization signal block; adding navigation message blocks on idle symbols. The embodiment of the present application adds a navigation message block for positioning the terminal in the downlink broadcast signal in the broadcast signal to achieve dual functions of navigation and communication under the same spectrum resources, improve spectrum utilization efficiency, and measure pseudorange through the broadcast signal, so that the terminal can be positioned in the synchronization stage, reducing the complexity of positioning and avoiding cumbersome access procedures.

[0033] The following describes a communication and conduction fusion signal design method based on 5G non-terrestrial network downlink broadcast proposed according to an embodiment of the present application in conjunction with the accompanying drawings.

[0034] See also Figure 1 , the method specifically comprises the following steps:

[0035] S101. Determine navigation message data based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters.

[0036] Among them, the navigation message data includes: low-orbit broadcast ephemeris message, check code and weekly time number. The check code includes parity check code, synchronization code, etc., which are used to describe the specific bit sequence in the navigation message for error detection and synchronization.

[0037] Synchronization code: ensures the identification of the location of the navigation message block.

[0038] The time of week field contains the satellite system time information, allowing the receiver to determine the time when the downlink broadcast block was transmitted. The terminal can use this information to calculate the transmission time of the satellite signal and then calculate the transmission time of the signal (the time from the satellite transmission to the receiver receiving the signal), thereby performing pseudorange calculations.

[0039] Low-orbit broadcast ephemeris message: describes the position and speed of the satellite in orbit, helping the terminal determine the precise position and time of the satellite.

[0040] In some embodiments, navigation message data is determined based on the low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination, including: fitting the low orbit prediction orbit generated by precise orbit determination as a pseudo-observation value to obtain the broadcast prediction orbit of the low orbit satellite within a preset time period; performing precision design on the sensitivity of the broadcast prediction orbit and Beidou enhancement parameters to truncation errors according to the broadcast ephemeris and enhancement information to obtain the low orbit satellite ephemeris parameters and target Beidou enhancement parameters; respectively arranging the low orbit satellite ephemeris parameters and the target Beidou enhancement parameters to obtain a low orbit broadcast ephemeris message; generating navigation message data based on the low orbit broadcast ephemeris message, check code and weekly time number.

[0041] First, precise real-time orbit determination can be performed using satellite-borne single-frequency GPS observation data. This process uses single-frequency GPS pseudorange and phase observation data to construct a single-frequency pseudorange phase ionospheric-free combination (GRAPHIC) to eliminate the influence of ionospheric delay errors.

[0042] The predicted low-orbit orbits obtained through precise orbit determination are used as pseudo-observations, which are then used for subsequent ephemeris parameter fitting.

[0043] If the existing 16-parameter broadcast ephemeris model is used, it is not suitable for establishing a high-precision broadcast ephemeris model for low-orbit navigation satellites. The designed 21-parameter ephemeris model can be used to fit the ephemeris of low-orbit satellites. The fitting process includes orbital extrapolation of the satellite under a complex force model in the geocentric inertial system (ECI). The perturbations include the non-spherical perturbation of the earth, the atmospheric drag perturbation, the third body gravitational perturbation and the light pressure perturbation.

[0044] The ephemeris parameters obtained by fitting are used to generate the broadcast prediction orbit of the low-orbit satellite. These orbit parameters are broadcast to the user equipment in the form of navigation messages.

[0045] Furthermore, the navigation message data is generated by combining the check code and the time of week.

[0046] S102: Generate a navigation message block based on the navigation message data.

[0047] In order to ensure that the navigation message data can be effectively spread and modulated through pseudo code modulation to achieve the purpose of navigation positioning, the navigation message data can generally be generated into a navigation message code.

[0048] In some embodiments, generating a navigation message block based on navigation message data includes: performing pseudo-code modulation on the navigation message data to obtain a navigation pseudo-random code; and performing resource mapping on the navigation pseudo-random code to obtain a navigation message block.

[0049] In some embodiments, generating a navigation message block based on navigation message data generally includes two steps: pseudo code modulation and resource mapping.

[0050] Wherein, the pseudo code modulation comprises the following steps:

[0051] Pseudocode generation: First, generate a pseudorandom noise code (PRN), which is a discrete symbol string with a certain period of 0 and 1. There are many ways to generate pseudorandom codes. GPS technology uses the m series, which is generated from the longest linear feedback shift register.

[0052] XOR addition of data code and pseudo code: The data code of the navigation message is first XOR-added with the pseudo code to achieve spectrum spread. This step is the core of pseudo code modulation. The signal spectrum spread is achieved through the combination of pseudo code and data code.

[0053] Modulation carrier: The combined code of the two modulates the carrier through bidirectional shift keying (BPSK). The user receiver demodulates the carrier and despreads the pseudo code of the received satellite signal to obtain a 50bps data code, and then finally transforms the data code into a navigation message according to the format of the navigation message.

[0054] Resource mapping may include the following steps:

[0055] Pseudo-random noise (PRN) code generation: Pseudo-random noise code is a periodic binary number sequence that has good autocorrelation of random code and certain coding rules. A binary number in the pseudo-code is called a chip, and the duration of a chip is called the code width.

[0056] Combining pseudo code with navigation message data: The data code of the navigation message is first XORed with the pseudo code to achieve spectrum spread. This step is the core of pseudo code modulation. The signal spectrum spread is achieved through the combination of pseudo code and data code.

[0057] Modulation carrier: The navigation message data modulated by pseudo code is phase modulated with the carrier to form the final navigation signal. The user receiver demodulates the carrier and despreads the pseudo code on the received satellite signal to obtain a 50bps data code, and then finally transforms the data code into a navigation message according to the format of the navigation message.

[0058] Signal synthesis and transmission: The three signals in GPS will be synthesized according to the line, and then transmitted to the world, forming the GPS signal that can be received at any time today. The transmitted signal components include: L1-C / A, L1-P signal, L2-P signal, etc.

[0059] S103. Add an idle symbol after the physical broadcast channel of the synchronization signal block.

[0060] S104. Add a navigation message block to the idle symbol.

[0061] Generally, the synchronization signal block includes system information, where system information is the downlink broadcast information sent periodically by the satellite. For any wireless technology, the terminal connecting to the satellite is very critical information. The terminal will read the system information when it is turned on to reside in the cell, and select and reselect the cell in the idle mode. The system information basically provides all the necessary detailed information required to access the network, such as satellite number, system frame number, system bandwidth, cell selection and reselection threshold, etc. In the idle state, the terminal can simultaneously receive the broadcast information of the resident satellite, and can also receive the configured neighboring satellite system broadcast information to perform cell measurement and reselection. At the same time, it can also receive the navigation system information broadcast by the neighboring satellite, so as to realize the terminal's positioning service. That is, the terminal can communicate with the satellite through the system information.

[0062] The synchronization signal block consists of the primary synchronization signal (PSS), the secondary synchronization signal (SSS) and the physical broadcast channel (PBCH). The PSS is located in the middle 127 subcarriers of the 0th symbol, the SSS is located in the middle 127 subcarriers of the 2nd symbol, and the PBCH is located in the 1st, 2nd and 3rd symbols. The 1st and 3rd symbols occupy all subcarriers from 0 to 239, and the 2nd symbol occupies all subcarriers except the subcarriers occupied by SSS and the idle subcarriers protecting SSS.

[0063] As can be seen from the above, there are still idle carriers in the synchronization signal block. Therefore, idle symbols can be added to the idle carriers, and navigation message blocks can be added to the idle symbols, so that when the terminal receives the synchronization signal block, that is, in the synchronization stage, the terminal can be positioned to realize the navigation function.

[0064] In some embodiments, in order to integrate communication and positioning functions into the same physical layer signal design, idle symbols can be added to the idle carrier after the physical broadcast channel.

[0065] Moreover, signal design is performed under the 5G framework without changing the resource mapping of the underlying 5G protocol, making it fully compatible with the current 5G network. There is no need for hasty design of large-scale hardware or software upgrades for the existing 5G network, thus reducing costs and improving user experience.

[0066] The present application proposes a method for designing a communication and navigation fusion signal based on 5G non-terrestrial network downlink broadcast, including: determining navigation message data based on the low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination; generating navigation message blocks based on navigation message data; adding idle symbols after the physical broadcast channel of the synchronization signal block; adding navigation message blocks on idle symbols. The embodiment of the present application adds a navigation message block for positioning the terminal in the downlink broadcast signal in the broadcast signal to achieve dual functions of navigation and communication under the same spectrum resources, improve spectrum utilization efficiency, and measure pseudo-range through the broadcast signal, so that the terminal can be positioned in the synchronization stage, reducing the complexity of positioning and avoiding cumbersome access procedures.

[0067] In some embodiments, the low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters are respectively arranged to obtain a low-orbit broadcast ephemeris message, including: the low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters are respectively arranged with the minimum broadcast bandwidth to achieve the optimal ephemeris description accuracy as the arrangement requirement to obtain a low-orbit broadcast ephemeris message.

[0068] This design is based on the characteristics of satellite orbits and simplifies the Beidou navigation ephemeris to design low-orbit satellite navigation ephemeris parameters. Combined with the communication physical channel model, broadcast message design and message parameter arrangement are carried out.

[0069] As an important part of the satellite navigation system design, broadcast ephemeris provides users with the position and speed of satellites to meet their navigation and positioning needs. The presentation of broadcast ephemeris directly determines the orbit accuracy, communication efficiency, user positioning effect and system scalability. Low-orbit Beidou enhanced positioning requires the design of low-orbit satellite navigation messages including low-orbit broadcast ephemeris and Beidou enhanced information. The user end can complete precise positioning by receiving navigation messages and observation information.

[0070] In some embodiments, achieving optimal ephemeris description accuracy with minimum broadcast bandwidth is crucial to improving the accuracy and performance of the navigation system. Therefore, a low-orbit broadcast ephemeris message that is programmed to achieve optimal ephemeris description accuracy with minimum broadcast bandwidth can enhance positioning accuracy and improve the overall accuracy of the navigation system.

[0071] In some embodiments, low-orbit satellite ephemeris parameters and target Beidou enhancement parameters are respectively arranged to obtain a low-orbit broadcast ephemeris message, including: sending the low-orbit satellite ephemeris parameters and target Beidou enhancement parameters to an arrangement model to obtain a low-orbit broadcast ephemeris message that meets the minimum broadcast bandwidth and achieves the optimal ephemeris description accuracy.

[0072] In some embodiments, an orchestration model may be pre-trained, and a low-orbit broadcast ephemeris message may be generated based on the orchestration model. The low-orbit broadcast ephemeris message generated by the orchestration model meets the orchestration requirement of achieving optimal ephemeris description accuracy with minimum broadcast bandwidth.

[0073] The arrangement model may be a model of the Global Positioning System (GPS) broadcast ephemeris, a model of the GLObal NAvigation Satellite System (GLONASS) broadcast ephemeris, a model of the Wide Area Augmentation System Geostationary Earth Orbit (WAAS GEO) broadcast ephemeris, and a model of the International Telecommunications Satellite Organization (INTELSAT) ephemeris.

[0074] The broadcast ephemeris generated by the above models all have the following characteristics:

[0075] The orbit is predicted based solely on navigation parameters and certain physical constants.

[0076] The predicted orbit is obtained using a geocentric model (such as GPS broadcast ephemeris) or a state numerical integrator based on a simplified force model (such as GLONASS broadcast ephemeris).

[0077] Given in the Earth-centered Earth-fixed coordinate system. As the satellite altitude decreases, the satellite orbit is increasingly affected by the higher-order terms of the Earth's gravity field and atmospheric drag. The RMS value of the fitting error URE of a 4-hour arc length using broadcast ephemeris 16 parameters for a GPS navigation satellite at an altitude of 20,000 kilometers is 7 cm, while the fitting error of an IGSO satellite at an altitude of 36,000 kilometers with the same fitting arc length is only 2.5 cm. To achieve the same accuracy as the 4-hour fitting arc length of a GPS satellite, a low-orbit satellite with an orbital altitude of 400 km to 1,400 km needs to reduce the fitting arc length to 10-20 minutes.

[0078] In some embodiments, the training process of the orchestration model is as follows:

[0079] Obtain sample data, which includes sample low-orbit satellite ephemeris parameters and target Beidou enhancement parameters; input the sample data matrix into the orchestration model to obtain the predicted low-orbit broadcast ephemeris message; obtain the optimal broadcast bandwidth of the ephemeris description accuracy of the predicted low-orbit broadcast ephemeris message; calculate the loss function value based on the broadcast bandwidth and the minimum broadcast bandwidth; adjust the model parameters of the orchestration model based on the loss function value, continue training, and obtain the trained orchestration model until the preset training completion conditions are met.

[0080] Among them, the preset training completion condition is that the number of training times reaches the preset number of training times or the loss function value is less than the preset loss function value. The preset number of training times and the preset loss function value can be flexibly set based on actual conditions.

[0081] The embodiment of the present application can achieve the optimal ephemeris description accuracy by reasonably arranging the low-orbit satellite ephemeris parameters through the minimum broadcast bandwidth.

[0082] In some embodiments, generating a navigation message block based on navigation message data includes: performing pseudo-code modulation on the navigation message data to obtain a navigation message modulated by a pseudo-random code; and performing orthogonal frequency division multiplexing modulation on the modulated navigation message to generate a navigation message block.

[0083] It is understandable that in order to improve the anti-interference capability of the signal, especially in an urban environment where the multipath effect is severe, the navigation message data may be modulated by pseudo code.

[0084] In some embodiments, the process of performing pseudo-code modulation on the navigation message data to obtain the navigation message modulated by the pseudo-random code can be implemented as follows:

[0085] Data preparation: Navigation messages are important information transmitted in satellite navigation systems, including satellite orbit parameters, time information, etc. These data first need to be encoded into binary form.

[0086] Pseudocode generation: Pseudocode (also called pseudorandom code or PN code) is a code sequence with good autocorrelation and cross-correlation characteristics, used for spread spectrum communication. In the navigation message, the pseudocode is XORed with the data code to achieve spread spectrum.

[0087] Modulation: The combined code of the spread spectrum data code and the pseudo code is modulated on the carrier through bidirectional shift keying (BPSK). This process transfers the data signal to the frequency of the carrier for transmission in the wireless channel.

[0088] Furthermore, in order to improve the efficiency and quality of data transmission and enhance the anti-interference capability of the signal, the modulated navigation message may be subjected to orthogonal frequency division multiplexing modulation to generate a navigation message block.

[0089] In some embodiments, the demodulation reference signal of the navigation message block channel is consistent with the demodulation reference signal of the physical broadcast signal channel.

[0090] To describe the process Figure 1 The functions of the synchronization signal block designed by the communication and conduction fusion signal design method based on the 5G non-terrestrial network downlink broadcast are shown, and the embodiment of the present application provides a schematic diagram of the downlink synchronization process. Figure 2 As shown, the following steps are included:

[0091] S201: Decode a primary synchronization signal sequence.

[0092] The primary synchronization signal is mainly used to help the terminal identify the beginning of the wireless frame.

[0093] The steps of decoding the primary synchronization signal may generally include:

[0094] The terminal tunes the RF receiver to the specified frequency point and performs cross-correlation detection on the PSS in the time domain to obtain time domain synchronization and obtain the cell ID. During the first symbol time of the SSB, there is only the PSS signal in the SSB frequency domain, so it can be correlated.

[0095] The position of the SSS can be obtained according to the position of the PSS. By performing cross-correlation detection on the SSS in the frequency domain, frequency domain synchronization and the cell group ID can be obtained at the same time.

[0096] S202: Decode the secondary synchronization signal sequence.

[0097] By decoding the PSS and SS, the terminal can obtain the starting point of the wireless frame, thereby achieving frame-level synchronization.

[0098] S203: Obtain a physical cell identifier and a frame start point.

[0099] S204: Detect a demodulation reference signal (DMRS).

[0100] The PCI can be obtained from the cell ID and cell group ID, and the PCI can be further used to decode the PBCH DMRS to obtain the SSB index and half frame number, as these are the components for generating the DMRS.

[0101] S205: Terminal cell search.

[0102] When the terminal cell search process is successful, the cell ID and navigation message block can be obtained, and the newly added or modified navigation message blocks of the own satellite and neighboring satellites can also be received.

[0103] S206: Decode the physical broadcast signal.

[0104] System information can be obtained by decoding the physical broadcast signal to enable communication between the terminal and the satellite.

[0105] S207: Decode the navigation message block.

[0106] By solving the navigation message block, the weekly time number and low-orbit broadcast ephemeris message can be obtained, so that the satellite position and speed can be provided to the user based on the weekly time number and low-orbit broadcast ephemeris message to meet the user's navigation and positioning needs.

[0107] The present application also provides a device for designing a communication and guidance fusion signal based on a 5G non-terrestrial network downlink broadcast, which is used to execute the communication and guidance fusion signal design method based on a 5G non-terrestrial network downlink broadcast provided in any of the above embodiments. Figure 3 As shown, the device includes a determination module 301 , a generation module 302 and an addition module 303 .

[0108] A determination module 301 is used to determine navigation message data based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters;

[0109] A generating module 302, configured to generate a navigation message block based on the navigation message data;

[0110] An adding module 303, configured to add an idle symbol after the physical broadcast channel of the synchronization signal block;

[0111] The adding module 303 is further used to add the navigation message block to the idle symbol.

[0112] The present application proposes a communication and navigation fusion signal design device based on 5G non-terrestrial network downlink broadcast, including: determining navigation message data based on low orbit prediction orbit and Beidou enhancement parameters generated by precise orbit determination; generating navigation message blocks based on navigation message data; adding idle symbols after the physical broadcast channel of the synchronization signal block; adding navigation message blocks on idle symbols. The embodiment of the present application adds a navigation message block for positioning the terminal in the downlink broadcast signal in the broadcast signal to achieve dual functions of navigation and communication under the same spectrum resources, improve spectrum utilization efficiency, and measure pseudo-range through the broadcast signal, so that the terminal can be positioned in the synchronization stage, reducing the complexity of positioning and avoiding cumbersome access procedures.

[0113] In some embodiments, the determination module 301 is specifically used to:

[0114] The low-orbit prediction orbit generated by precise orbit determination is used as a pseudo-observation value for fitting to obtain the broadcast prediction orbit of the low-orbit satellite within a preset time period;

[0115] According to the broadcast ephemeris and enhancement information, the sensitivity of the truncation error of each parameter of the broadcast forecast orbit and Beidou enhancement parameters is accurately designed to obtain the low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters;

[0116] The low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters are respectively arranged to obtain a low-orbit broadcast ephemeris message;

[0117] Navigation message data is generated based on the low-orbit broadcast ephemeris message, the check code and the time of week.

[0118] In some embodiments, the determination module 301 is further specifically configured to:

[0119] The low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters are arranged respectively with the minimum broadcast bandwidth to achieve the optimal ephemeris description accuracy as the arrangement requirement to obtain a low-orbit broadcast ephemeris message.

[0120] In some embodiments, the determination module 301 is further specifically configured to:

[0121] The low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters are sent to the editing model to obtain a low-orbit broadcast ephemeris message that meets the minimum broadcast bandwidth and achieves the optimal ephemeris description accuracy.

[0122] In some embodiments, the training process of the orchestration model is as follows:

[0123] Acquire sample data, wherein the sample data includes sample low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters;

[0124] Inputting the sample data matrix into the arrangement model to obtain a predicted low-orbit broadcast ephemeris message;

[0125] Obtaining a broadcast bandwidth having an optimal ephemeris description accuracy for the predicted low-orbit broadcast ephemeris message;

[0126] Calculating a loss function value based on the broadcast bandwidth and the minimum broadcast bandwidth;

[0127] The model parameters of the orchestration model are adjusted based on the loss function value, and the training is continued until a preset training completion condition is met to obtain a trained orchestration model.

[0128] In some embodiments, the generating module 302 is specifically used to:

[0129] Performing pseudo-code modulation on the navigation message data to obtain a navigation message modulated by a pseudo-random code;

[0130] The modulated navigation message is subjected to orthogonal frequency division multiplexing modulation to generate a navigation message block.

[0131] In some embodiments, the demodulation reference signal of the navigation message block channel is consistent with the demodulation reference signal of the physical broadcast signal channel.

[0132] The present application also provides an electronic device to implement the above-mentioned 5G non-terrestrial network downlink broadcast based on the communication and conduction fusion signal design method. Please refer to Figure 4 It shows a schematic diagram of an electronic device provided by some embodiments of the present application. Figure 4 As shown, the electronic device 7 includes: a processor 700, a memory 701, a bus 702 and a communication interface 703, and the processor 700, the communication interface 703 and the memory 701 are connected through the bus 702; the memory 701 stores a computer program that can be run on the processor 700, and when the processor 700 runs the computer program, it executes the communication and conduction fusion signal design method based on 5G non-terrestrial network downlink broadcasting provided in any of the aforementioned embodiments of the present application.

[0133] The memory 701 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the device network element and at least one other network element is realized through at least one communication interface 703 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0134] The bus 702 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. Among them, the memory 701 is used to store programs, and the processor 700 executes the program after receiving the execution instruction. The communication and conduction fusion signal design method based on 5G non-terrestrial network downlink broadcast disclosed in any implementation method of the aforementioned embodiment of the present application can be applied to the processor 700, or implemented by the processor 700.

[0135] The processor 700 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 700. The above processor 700 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 readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 701, and the processor 700 reads the information in the memory 701 and completes the steps of the above method in combination with its hardware.

[0136] The electronic device provided in the embodiment of the present application and the communication and conduction fusion signal design method based on 5G non-terrestrial network downlink broadcast provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0137] The present application also provides a computer-readable storage medium corresponding to the method for designing a communication and conduction fusion signal based on 5G non-terrestrial network downlink broadcast provided in the above embodiment. Please refer to Figure 5 The computer-readable storage medium shown is a CD 30, on which a computer program (i.e., a program product) is stored. When the computer program is run by the processor, it will execute the communication and guidance fusion signal design method based on 5G non-terrestrial network downlink broadcasting provided by any of the aforementioned embodiments.

[0138] It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0139] The computer-readable storage medium provided in the above-mentioned embodiments of the present application and the communication and conduction fusion signal design method based on 5G non-terrestrial network downlink broadcast provided in the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0140] It should be noted that:

[0141] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0142] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0143] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for designing a communication and guidance fusion signal based on 5G non-terrestrial network downlink broadcast, characterized in that: include: Determine navigation message data based on the low-orbit predicted orbit generated by precise orbit determination and Beidou augmentation parameters; Generate a navigation message block based on the navigation message data; Adding idle symbols after the physical broadcast channel of the synchronization signal block; The navigation message block is added to the idle symbol. The navigation message data is determined based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters, including: The low-orbit prediction orbit generated by precise orbit determination is used as a pseudo-observation value for fitting to obtain the broadcast prediction orbit of the low-orbit satellite within a preset time period; According to the broadcast ephemeris and enhancement information, the sensitivity of the truncation error of each parameter of the broadcast forecast orbit and Beidou enhancement parameters is accurately designed to obtain the low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters; The low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters are respectively arranged to obtain a low-orbit broadcast ephemeris message; Generate navigation message data based on the low-orbit broadcast ephemeris message, the check code and the time of week; The step of respectively arranging the low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters to obtain a low-orbit broadcast ephemeris message includes: Sending the low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters to the editing model to obtain a low-orbit broadcast ephemeris message that meets the minimum broadcast bandwidth and achieves the optimal ephemeris description accuracy; The training process of the orchestration model is as follows: Acquire sample data, wherein the sample data includes sample low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters; Inputting the sample data matrix into the arrangement model to obtain a predicted low-orbit broadcast ephemeris message; Obtaining a broadcast bandwidth having an optimal ephemeris description accuracy for the predicted low-orbit broadcast ephemeris message; Calculating a loss function value based on the broadcast bandwidth and the minimum broadcast bandwidth; The model parameters of the orchestration model are adjusted based on the loss function value, and the training is continued until a preset training completion condition is met to obtain a trained orchestration model.

2. The method according to claim 1, characterized in that The step of respectively arranging the low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters to obtain a low-orbit broadcast ephemeris message includes: The low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters are arranged respectively with the minimum broadcast bandwidth to achieve the optimal ephemeris description accuracy as the arrangement requirement to obtain a low-orbit broadcast ephemeris message.

3. The method according to claim 1, characterized in that: The generating of the navigation message block based on the navigation message data comprises: Performing pseudo-code modulation on the navigation message data to obtain a navigation message modulated by a pseudo-random code; The modulated navigation message is subjected to orthogonal frequency division multiplexing modulation to generate a navigation message block.

4. The method according to claim 1, characterized in that The demodulation reference signal of the navigation message block channel is consistent with the demodulation reference signal of the physical broadcast signal channel.

5. A communication and guidance fusion signal design device based on 5G non-terrestrial network downlink broadcast, characterized in that: include: A determination module is used to determine navigation message data based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters; The navigation message data is determined based on the low orbit prediction orbit generated by precise orbit determination and Beidou augmentation parameters, including: The low-orbit prediction orbit generated by precise orbit determination is used as a pseudo-observation value for fitting to obtain the broadcast prediction orbit of the low-orbit satellite within a preset time period; According to the broadcast ephemeris and enhancement information, the sensitivity of the truncation error of each parameter of the broadcast forecast orbit and Beidou enhancement parameters is accurately designed to obtain the low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters; The low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters are respectively arranged to obtain a low-orbit broadcast ephemeris message; Generate navigation message data based on the low-orbit broadcast ephemeris message, the check code and the time of week; The step of respectively arranging the low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters to obtain a low-orbit broadcast ephemeris message includes: Sending the low-orbit satellite ephemeris parameters and the target Beidou augmentation parameters to the editing model to obtain a low-orbit broadcast ephemeris message that meets the minimum broadcast bandwidth and achieves the optimal ephemeris description accuracy; The training process of the orchestration model is as follows: Acquire sample data, wherein the sample data includes sample low-orbit satellite ephemeris parameters and the target Beidou enhancement parameters; Inputting the sample data matrix into the arrangement model to obtain a predicted low-orbit broadcast ephemeris message; Obtaining a broadcast bandwidth having an optimal ephemeris description accuracy for the predicted low-orbit broadcast ephemeris message; Calculating a loss function value based on the broadcast bandwidth and the minimum broadcast bandwidth; The model parameters of the orchestration model are adjusted based on the loss function value, and the training is continued until the preset training completion condition is met to obtain a trained orchestration model. A generation module, used for generating a navigation message block based on the navigation message data; An adding module, used for adding an idle symbol after the physical broadcast channel of the synchronization signal block; The adding module is further used to add the navigation message block to the idle symbol.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: The processor runs the computer program to implement the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to any one of claims 1 to 4.

Images