A communication and conduction fusion terminal

Abstract

A communication and navigation fusion terminal relates to the field of satellite communication technology, and comprises a Beidou short message module, a Tiantong module, a low-orbit satellite Internet module, a terminal antenna, a data link module and a power and data interaction module; the Beidou short message module, the Tiantong satellite module and the low-orbit satellite Internet module respectively interact with satellite signals of their respective frequency bands through the terminal antenna; the data link module can receive data from the Beidou short message module, the Tiantong satellite module and the low-orbit satellite Internet module in a local fusion terminal, and interact with the data link module of an external fusion terminal through the terminal antenna; the power and data interaction module is used to supply power to the Beidou short message module, the Tiantong module, the low-orbit satellite Internet module and the data link module, and interact with the data of the data link module, and the power and data interaction module is communicatively connected to a host computer; the integrated terminal can provide reliable communication and precise navigation functions at the same time.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a communication and navigation fusion terminal. Background Art

[0002] In recent years, with the rapid development of satellite communication technology and satellite navigation technology, the communication and navigation fusion system, as a new system integrating communication and navigation, has become an important research direction in the fields of aviation and navigation. The communication and navigation fusion system aims to provide more reliable and efficient service capabilities by integrating multiple communication and navigation technologies.

[0003] Among them, the progress of satellite communication technology provides users with a communication method that covers the whole world and is not restricted by geographical location. Beidou short message communication, Tiantong satellite communication and low-orbit satellite Internet communication technologies provide a reliable communication method for users in aircraft, ships and remote areas.

[0004] Beidou short message communication uses the Beidou satellite system to provide a short message communication service suitable for low-bandwidth and low-latency application scenarios.

[0005] Tiantong Satellite Communications is based on the Tiantong satellite system and provides users with voice and data communication services, especially when ground communication facilities are unavailable.

[0006] Low-orbit satellite Internet communications use a constellation of low-Earth orbit (LEO) satellites to provide high-speed Internet access services, making up for the problem of insufficient coverage of ground communication networks.

[0007] Satellite navigation technologies such as the Beidou satellite navigation system and GPS provide users with accurate positioning, navigation and timing services. These systems play an important role in aviation, navigation, vehicle navigation and other fields.

[0008] With the development of satellite communication and satellite navigation technology, the market demand for terminal devices that can provide both communication and navigation functions is growing. Existing terminal devices often focus on one function and lack the ability to organically integrate communication and navigation functions.

[0009] However, in application scenarios such as aviation and navigation, a terminal device is needed that can provide both reliable communication and precise navigation to cope with complex operating environments and changes in communication conditions.

[0010] Currently, most terminal devices on the market only have a single function, such as only providing satellite communication or satellite navigation services, and lack comprehensive service capabilities.

[0011] In emergency situations or special circumstances, single-function terminal devices often cannot meet user needs, especially when communication networks are interrupted.

[0012] A Chinese patent (CN115514409A) discloses a method for constructing a space-time network system. Based on a communication network and a positioning network, it integrates various communication, positioning and enhancement technologies to build an integrated communication and navigation network. It can generate high-precision space-time information based on the generated space-time enhancement information and the collected user information, and support multi-source, full-domain high-precision positioning and timing services. However, since the patent needs to cover too many communication means, it cannot meet the accuracy requirements of satellite navigation.

[0013] Therefore, it is an urgent need to develop a communication and navigation fusion terminal that can provide both reliable communication and precise navigation functions. Summary of the invention

[0014] In order to overcome the deficiencies in the background technology, the present invention discloses a communication and conduction fusion terminal.

[0015] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0016] A communication and navigation fusion terminal, comprising a Beidou short message module, a Tiantong module, a low-orbit satellite Internet module, a terminal antenna, a data link module, and a power and data interaction module;

[0017] The Beidou short message module, Tiantong satellite module and low-orbit satellite Internet module respectively interact with satellite signals of their respective frequency bands through terminal antennas;

[0018] The data link module can receive data from the Beidou short message module, Tiantong satellite module and low-orbit satellite Internet module in the local fusion terminal, and interact with the data link module of the external fusion terminal through the terminal antenna;

[0019] The power supply and data interaction module is used to supply power to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module, and to interact with the data link module, and the power supply and data interaction module is communicatively connected to the host computer.

[0020] Preferably, the terminal antenna includes a Beidou antenna connected to the Beidou short message module, a Tiantong antenna connected to the Tiantong module, a low-orbit satellite antenna connected to the low-orbit satellite Internet module, and a data link antenna connected to the data link module.

[0021] Preferably, the data link module adopts a superheterodyne single-frequency conversion architecture.

[0022] Preferably, the data link module specifically includes a data processing platform, a data sending unit and a data receiving unit;

[0023] The data processing platform is used to receive and process data from the Beidou short message module, Tiantong module and low-orbit satellite Internet module;

[0024] The data transmission unit includes a baseband module and a channel module, wherein the baseband module is used to convert the processed data into two-way digital signals of in-phase and orthogonal direction, and output them through a digital-to-analog converter, and the channel module performs orthogonal up-conversion processing on the two-way digital signals of in-phase and orthogonal direction, converts the signals into radio frequency signals, and outputs them to other communication-conductivity fusion terminals through terminal antennas;

[0025] The data receiving unit performs orthogonal down-conversion processing on the received radio frequency signal, converts it into an intermediate frequency signal, and outputs the intermediate frequency signal to the power supply and data interaction module.

[0026] Preferably, data is exchanged between the data link module and the Beidou short message module, Tiantong module and low-orbit satellite Internet module through TTL.

[0027] Preferably, the data link module interacts with the data interaction module via TTL and power supply, and interacts with the data link modules of other fusion terminals via a local area network.

[0028] Preferably, the power supply and data interaction module provides 3.8V DC for the Beidou short message module, Tiantong module and low-orbit satellite Internet module.

[0029] Preferably, the power supply and data interaction module provides 28V DC for the data link module.

[0030] Preferably, the power supply and data interaction module interacts with the host computer data via a local area network.

[0031] Preferably, the signal input end of the power and data interaction module receives the clock signal and the 1PPS signal through an SMA-K connector;

[0032] The power input end of the power supply and data interaction module is electrically connected to a 220V AC voltage source, and the power supply and data interaction module can convert the 220V AC voltage into direct current of corresponding voltage, and supply it to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module respectively.

[0033] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0034] The present invention discloses a communication and navigation fusion terminal, which integrates multiple communication modes of Beidou short message communication, Tiantong satellite communication and low-orbit satellite Internet communication, and has a collaborative navigation function, and can provide comprehensive communication and navigation services;

[0035] The data link module adopts a superheterodyne single-conversion architecture, which improves the efficiency of signal processing and the reliability of data transmission, especially in complex electromagnetic environments;

[0036] The power and data interaction module not only provides stable power supply for each module, but also manages data interaction to ensure efficient operation of the system;

[0037] Each module exchanges data via TTL, which simplifies the data transmission process and improves the flexibility of the system.

[0038] The power and data interaction module interacts with the host computer through the local area network, allowing the terminal to easily exchange data with the external system;

[0039] The power and data interaction module can convert 220V AC voltage into the required DC voltage, providing stable power supply for each module and ensuring the continuous operation of the system;

[0040] The terminal antennas include Beidou antenna, Tiantong antenna, low-orbit satellite antenna and data link antenna, which are connected to the corresponding modules respectively to improve the efficiency of signal reception and transmission;

[0041] The data processing platform in the data link module can effectively process the received data, ensuring the accuracy and timeliness of the data;

[0042] The terminal supports multiple communication modes such as Beidou short message communication, Tiantong satellite communication and low-orbit satellite Internet communication, and can provide stable communication services in different application scenarios;

[0043] The terminal supports data interaction with data link modules of other integrated terminals, enhancing the system's networking capability and scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A structural schematic diagram of the present invention;

[0045] Figure 2 The figure is a schematic diagram of the communication structure between multiple communication and navigation fusion terminals. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right" and the like indicating directions or positional relationships, they are only corresponding to the drawings of the present invention, for the convenience of describing the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction:

[0047] Embodiment 1 is:

[0048] Combined with Figure 1-2The communication and navigation fusion terminal comprises a Beidou short message module, a Tiantong module, a low-orbit satellite Internet module, a terminal antenna, a data link module, and a power supply and data interaction module;

[0049] The Beidou short message module, Tiantong satellite module and low-orbit satellite Internet module respectively interact with satellite signals of their respective frequency bands through terminal antennas;

[0050] The Beidou short message module is used to receive the position, speed, orientation information and monitoring data information of the Beidou satellite, the Tiantong satellite module is used to receive the position, speed, orientation information and monitoring data information of the Tiantong satellite, and the low-orbit satellite Internet module is used to receive the position, speed, orientation information and monitoring data information of the low-orbit satellite;

[0051] When the Beidou short message module exchanges data with the Beidou satellite, the built-in Beidou short message communication chip can exchange data in short message mode with the Beidou satellite system through the terminal antenna. The module is responsible for processing short message communication data and sending the data to the data link module for further processing;

[0052] The Tiantong module is based on the Tiantong satellite mobile communication baseband chip, integrating the "communication and navigation integrated" baseband processing chip, RF chip, power amplifier, power management, storage and peripheral chips to achieve an integrated communication and navigation anti-interference baseband chip. The module can exchange data with the Tiantong satellite system through the terminal antenna;

[0053] The low-orbit satellite Internet module has a built-in low-orbit satellite communication chip, which can exchange data with the low-orbit satellite Internet system through the low-orbit satellite Internet antenna; this module is responsible for processing low-orbit satellite Internet communication data and sending the data to the data link module for further processing.

[0054] The data link module can receive data from the Beidou short message module, Tiantong satellite module and low-orbit satellite Internet module in the local fusion terminal, and interact with the data link module of the external fusion terminal through the terminal antenna;

[0055] After receiving the position, speed, orientation information and monitoring data information of Beidou satellites, Tiantong satellites and low-orbit satellites output by the Beidou short message module, Tiantong satellite module and low-orbit satellite Internet module, the data link module processes and integrates these data information containing communication content and navigation content, generates networking information, time data and ranging information, integrates the information of communication content and navigation content, and sends it to the power and data interaction module through the terminal antenna.

[0056] The power supply and data interaction module is used to power the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module, and to interact with the data link module, and the power supply and data interaction module is connected to the host computer for communication;

[0057] The power supply and data interaction module sends the integrated communication information and integrated navigation information to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module, realizing the smooth integration of the communication network and the positioning network and the mutual enhancement of service capabilities.

[0058] Embodiment 2 is:

[0059] On the basis of Example 1, the terminal antenna is further limited, that is, the terminal antenna includes a Beidou antenna connected to the Beidou short message module, a Tiantong antenna connected to the Tiantong module, a low-orbit satellite antenna connected to the low-orbit satellite Internet module, and a data link antenna connected to the data link module;

[0060] By enabling each satellite communication module to have a corresponding antenna to communicate with the corresponding satellite, the receiving and transmitting efficiency of each satellite communication module is improved, thereby improving the overall data reception and transmission efficiency of the integrated terminal.

[0061] Embodiment 3 is:

[0062] On the basis of Example 1, the data link module is further limited, that is, the data link module adopts a superheterodyne single-conversion architecture, which is mainly used to complete the shifting of the spectrum and the reception of the data link radio frequency signal.

[0063] In addition, the data link module specifically includes a data processing platform, a data sending unit and a data receiving unit;

[0064] The data processing platform is used to receive and process data from the Beidou short message module, Tiantong module and low-orbit satellite Internet module;

[0065] The data transmission unit includes a baseband module and a channel module, wherein the baseband module is used to convert the processed data into two-way digital signals of in-phase and orthogonal direction, and output them through a digital-to-analog converter, and the channel module performs orthogonal up-conversion processing on the two-way digital signals of in-phase and orthogonal direction, converts the signals into radio frequency signals, and outputs them to other communication-conductivity fusion terminals through terminal antennas;

[0066] The data receiving unit performs orthogonal down-conversion processing on the received radio frequency signal, converts it into an intermediate frequency signal, and outputs the intermediate frequency signal to the power supply and data interaction module;

[0067] The data processing platform is based on the beam selection algorithm, which embeds the multiplexing factor positioning signal of the time-division code-division orthogonal frequency-division multiplexing frequency into the background noise of the communication signal, distributes the positioning signals of different cells to different frequency bands, and modulates the frequency domain composite OFDM spread spectrum sequence in the frequency domain to generate a modulated spread spectrum signal that integrates satellite navigation and satellite communication, so as to realize the continuous capture and tracking of the positioning signal during communication.

[0068] Furthermore, the data link module uses the inverse fast Fourier transform IFFT and the fast Fourier transform FF to realize modulation and demodulation respectively, modulates to transmit on each subchannel, and then uses the non-return-to-zero square wave with a symbol period of T as the baseband code type, which is modulated by the modulator and sent to the integrated channel module for channel transmission, and inserts a protection interval isolation band obtained by periodic expansion of the OFDM signal in front of each OFDM transmission signal; optimizes the allocation of information bits transmitted on each subcarrier according to the signal-to-noise ratio of each subcarrier, automatically controls the use of each subcarrier, and effectively avoids the influence of noise interference and frequency selectivity on data transmission reliability; as long as the multipath delay does not exceed the protection interval, the orthogonality between subcarriers will not be destroyed. In the Fourier transform mode, the fast Fourier algorithm is used to directly perform FFT on each frame of data to obtain the modulated sequence, and the received sequence is FFT at the receiving end to restore the original data.

[0069] In addition, the power supply and data interaction module opens up the information interaction interface of the communication and navigation system, uses the networking protocol of navigation and positioning information to assist in optimizing the networking, establishes a mathematical model of the integrated network communication, navigation and cooperation channel for interconnected and enhanced networked space-time services, and collects and summarizes the status of each link device.

[0070] The power supply and data interaction module provides flexible services based on multi-module networking, unified space-ground joint time reference, standard protocol, bus protocol, and universal link protocol. The combined navigation algorithm is elastically scaled on demand, and the optimal combination effect and dynamic balance are sought between the configuration of communication resources and navigation resources. It performs integrated communication and navigation energy distribution, deeply integrates the communication and navigation signal level, channel level, processing level, application level, and management level, and intelligently allocates and schedules resources.

[0071] When multiple types of PNT information are fused, the mathematical model of the communication and guidance fusion channel uses adaptive Kalman filtering to perform PNT information fusion. On the basis of information compatibility and interoperability, the variance or weight of each type of observation information is determined in real time or near real time, and the timing performance of the waveform is measured by the weighted integral sidelobe level of the autocorrelation function. The algorithm of variable alternating iterative optimization is used to iteratively solve the waveform total power constraint and waveform constant modulus constraint, the norm error on the constellation diagram, and the task allocation optimization that measures communication performance. Then, the joint optimization of task allocation and power is decoupled to obtain the optimal solution for power control. The positioning accuracy is guaranteed while maximizing the network utility. The fault tolerance and error compensation capabilities of multi-source information will be enhanced, especially the multi-source information fusion based on the robust estimation principle, which will improve the robustness (robustness) of the comprehensive PNT.

[0072] The data link module sets an independent navigation signal to broadcast a bandwidth frequency-division navigation signal, and periodically broadcasts a short burst navigation signal and a time-division navigation signal; a high-bandwidth low-power navigation signal and a broadband power-controlled navigation signal are superimposed on the communication signal.

[0073] The power and data interaction module can be connected to the inertial sensor and the external auxiliary sensor interaction unit, and provides an interface between the isochronous software driver and the physical signal layer through the link layer. During the transmission, the link layer generates an isochronous packet to be sent through the cable. The link layer also receives the isochronous packet from the bus, decodes the channel number of the packet, and realizes the deep integration of navigation and communication at the physical signal layer. At the same time, time, frequency bandwidth and power are allocated according to the specific needs of navigation and communication.

[0074] Furthermore, the mathematical model of the communication and navigation fusion channel utilizes the satellite mobile communication network (Tiantong, low-orbit satellite Internet, Beidou short message), combined with the regional data link self-organizing network, based on the networked centerless benchmark establishment, maintenance and transmission, coordination, PNT resource coordination, scheduling, intelligent PNT information service network system, and simultaneously performs perception and communication tasks in N time slots, continuously performs multiple perception tasks through collaborative perception and transmission, and uses deep reinforcement learning algorithm perception and computing services to track and supervise aircraft. It can effectively enhance the information processing capabilities of the system.

[0075] In particular, the data link module interacts with the Beidou short message module, the Tiantong module and the low-orbit satellite Internet module through TTL; and the data link module interacts with the data interaction module through TTL and power supply, and interacts with the data link modules of other fusion terminals through the local area network, which can effectively simplify the data transmission process and improve the flexibility of the system.

[0076] In addition, the power supply and data interaction module provides 3.8V DC for the Beidou short message module, Tiantong module and low-orbit satellite Internet module.

[0077] The power supply and data interaction module provides 28V DC for the data link module.

[0078] In addition, the power supply and data interaction module interacts with the host computer data via a local area network.

[0079] According to the needs, the signal input end of the power and data interaction module receives the clock signal and the 1PPS signal through the SMA-K connector;

[0080] The power input end of the power supply and data interaction module is electrically connected to a 220V AC voltage source, and the power supply and data interaction module can convert the 220V AC voltage into direct current of corresponding voltage, and supply it to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module respectively.

[0081] When implementing the communication and navigation fusion terminal described in the present invention, the fusion terminal is first set in an aircraft, and the Beidou short message module, Tiantong module and low-orbit satellite Internet module of the fusion terminal are used to exchange data with the Beidou satellite, Tiantong satellite and low-orbit satellite through the terminal antenna, respectively, to receive the satellite's position, speed, orientation information and monitoring data, and to return its own position, speed, orientation information and monitoring data to the corresponding satellite, so as to achieve mutual communication;

[0082] Then the Beidou short message module, Tiantong module and low-orbit satellite Internet module output the received information to the data link module, and the data link module of the local fusion terminal simultaneously exchanges data with the data link modules of the fusion terminals on other aircraft, that is, the data link module of each fusion terminal can analyze and determine the position and speed of all fusion terminals;

[0083] Finally, the power supply and data interaction module provides power for the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module, and receives data information from the Beidou short message module, Tiantong module and low-orbit satellite Internet module, as well as the communication and navigation fusion information of the data link module, and then redistributes the received information and outputs it to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module respectively.

[0084] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A communication and navigation fusion terminal, characterized by: Including Beidou short message module, Tiantong module, low-orbit satellite Internet module, terminal antenna, data link module and power and data interaction module; The Beidou short message module, Tiantong module and low-orbit satellite Internet module respectively interact with satellite signals of their respective frequency bands through terminal antennas; The terminal antenna includes a Beidou antenna connected to the Beidou short message module, a Tiantong antenna connected to the Tiantong module, a low-orbit satellite antenna connected to the low-orbit satellite Internet module, and a data link antenna connected to the data link module; The data link module can receive data from the Beidou short message module, Tiantong module and low-orbit satellite Internet module in the local fusion terminal, and interact with the data link module of the external fusion terminal through the terminal antenna; The data link module adopts a superheterodyne primary frequency conversion architecture, and the data link module includes a data processing platform, a data sending unit and a data receiving unit; The data processing platform is used to receive and process data from the Beidou short message module, Tiantong module and low-orbit satellite Internet module; The data processing platform is based on the beam selection algorithm, which embeds the multiplexing factor positioning signal of the time-division code-division orthogonal frequency-division multiplexing frequency into the background noise of the communication signal, distributes the positioning signals of different cells to different frequency bands, and modulates the frequency domain composite OFDM spread spectrum sequence in the frequency domain to generate a modulated spread spectrum signal that integrates satellite navigation and satellite communication; The data transmission unit includes a baseband module and a channel module, wherein the baseband module is used to convert the processed data into two-way digital signals of in-phase and orthogonal direction, and output them through a digital-to-analog converter, and the channel module performs orthogonal up-conversion processing on the two-way digital signals of in-phase and orthogonal direction, converts the signals into radio frequency signals, and outputs them to other communication-conductivity fusion terminals through terminal antennas; The data link module uses inverse fast Fourier transform IFFT and fast Fourier transform FFT to realize modulation and demodulation respectively, and transmits on each sub-channel. Then, a non-return-to-zero square wave with a symbol period of T is used as the baseband code type, which is modulated by the modulator and sent to the channel module for channel transmission. A guard interval isolation band obtained by periodic expansion of the OFDM signal is inserted in front of each OFDM transmission signal. The data receiving unit performs orthogonal down-conversion processing on the received radio frequency signal to convert it into an intermediate frequency signal, and the intermediate frequency signal is output to the power supply and data interaction module; The power supply and data interaction module is used to supply power to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module, and to interact with the data link module, and the power supply and data interaction module is communicatively connected to the host computer.

2. The communication and conduction fusion terminal according to claim 1, characterized in that: The data link module interacts with the Beidou short message module, Tiantong module and low-orbit satellite Internet module through TTL.

3. The communication and conduction fusion terminal according to claim 1, characterized in that: The data link module performs data interaction with the data interaction module via TTL and power supply, and performs data interaction with the data link modules of other fusion terminals via a local area network.

4. The communication and conduction fusion terminal according to claim 1, characterized in that: The power supply and data interaction module provides 3.8V DC for the Beidou short message module, Tiantong module and low-orbit satellite Internet module.

5. The communication and conduction fusion terminal according to claim 1, characterized in that: The power supply and data interaction module provides 28V DC for the data link module.

6. The communication and conduction fusion terminal according to claim 1, characterized in that: The power supply and data interaction module interacts with the host computer data via the local area network.

7. The communication and conduction fusion terminal according to claim 1, characterized in that: The signal input end of the power and data interaction module receives the clock signal and the 1PPS signal through the SMA-K connector; The power input end of the power supply and data interaction module is electrically connected to a 220V AC voltage source, and the power supply and data interaction module can convert the 220V AC voltage into direct current of corresponding voltage, and supply it to the Beidou short message module, Tiantong module, low-orbit satellite Internet module and data link module respectively.

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