19 results about "Satellite mobile communication" patented technology

The invention relates to a satellite mobile communication antenna adaptive beam prediction and control method, which comprises the following steps: acquiring motion data of a user terminal, signal state data of a satellite antenna receiving end, satellite-ground attitude data of a satellite and environment interference data of the ground, and processing to obtain a multi-source data set; the method comprises the following steps: constructing a geometric correlation feature, a gain correlation feature, a sidelobe correlation feature and an array element phase correlation feature of a multi-source data set and beam parameters, constructing a correlation matrix, and splicing the correlation matrix with the multi-source data set to obtain a complete input feature set; a beam prediction model is constructed, and training and verification are carried out; and converting the output of the beam prediction model into a control signal to drive an antenna array element to adjust, correcting model parameters based on the link signal-to-noise ratio, the bit error rate and the throughput collected by the user terminal, and splitting / combining the beam. According to the method, the beam parameter prediction precision and environment adaptability can be improved, interference is suppressed, resource allocation is optimized, and stability and high efficiency of satellite communication in a high-dynamic complex environment are guaranteed.

The application discloses a satellite switching coordination prediction method for interference avoidance, and relates to the technical field of satellite mobile communication.The application comprises the following steps: after receiving the interference avoidance instruction of a ground network control center, a service satellite precalculates a differentiated switching advance for a terminal according to the antenna type and service quality level of the terminal; then, the inter-satellite link is used to acquire the predicted coverage time window and load state of a neighboring satellite for the area where the satellite terminal is located, and a comprehensive score is obtained; and finally, at the switching trigger moment, the satellite terminal is switched to the neighboring satellite with the highest comprehensive score, so that the target satellite can provide continuous and stable service in the subsequent period of time, and the risk of'secondary switching' caused by the subsequent interference avoidance of the target satellite is effectively avoided.The application significantly improves the continuity of high-priority services and the overall resource utilization efficiency of the system by deeply coordinating the management of the interference avoidance plan and the switching mechanism.

The application is a satellite 5G large dynamic high-speed transmission real-time receiving and time synchronization method and system based on FPGA, and belongs to the technical field of wireless communication.The system is provided with a real-time receiving module, a time synchronization module and the like at the receiving end of a satellite-ground transmission link.The method comprises the following steps: the receiving end stores data into a DDR3 in real time by using an asynchronous FIFO, and performs time synchronization once every transmission half-frame signal;the starting point of a symbol is calculated in a multi-symbol combination mode, the content of each symbol is obtained according to the starting point of the symbol, a correlation value is calculated according to a known PSS sequence, the starting point of the half-frame signal is obtained, and subsequent CP removal and demodulation operations are continuously performed;the application solves the problem of timing synchronization difficulty caused by large time delay and large frequency offset, realizes low complexity and timing synchronization error not affected by carrier frequency offset under the premise of ensuring accuracy, and can be used for the time synchronization process of a satellite mobile communication system with large dynamic frequency offset.

The invention discloses a beam resource dynamic allocation method of a satellite communication system, and belongs to a satellite mobile communication method. The method comprises the following steps: scheduling a service beam to carry out resource allocation by taking a beam position as a unit based on the current beam resource of a satellite, the state and priority of an access terminal and the like. A connected terminal, a new access terminal and a resource transformation terminal can be called non-reserved resource terminals, and only non-reserved wave positions can be allocated. And the reserved resource terminal can only allocate reserved wave positions. The beam management module analyzes and processes the beam resource state when receiving the service request, and releases and adjusts the terminal under the beam; and then, according to a beam allocation strategy of staring first and then dynamic, allocation processing of reserved resource terminals is carried out first, and then allocation processing of non-reserved resource terminals is carried out. According to the invention, factors such as different wave beam states, different terminal states, priority and continuity of terminal allocation and the like under the same satellite can be fully considered, the utilization efficiency of wave beam resources is improved, and the system performance is improved.

The application provides a multi-user cooperative communication system and method based on satellite mobile communication. The system comprises: a gateway station receiving various types of information sent by corresponding user terminals through satellite mobile communication connection and sending the information to an information transmission service module; the information transmission service module sending the information to a multi-user cooperative communication service module; sending a service request to the multi-user cooperative communication service module; the multi-user cooperative communication service module receiving the information; sending corresponding information to corresponding user terminals according to the service request; the user terminals sending various types of information and service requests to the gateway station, receiving service information fed back by the multi-user cooperative communication service module through the gateway station and forwarding the service information to other user terminals in corresponding groups; and a data monitoring center monitoring and obtaining the information received by the multi-user cooperative communication service module and the service information fed back. The system can adapt to various scenes and meet efficient communication among user groups in a small range.

The invention discloses a low-orbit phased array terminal satellite capture and inertial navigation real-time calibration method, device and system and a medium, and belongs to the field of satellite mobile communication, and the method comprises the following steps: after a satellite is successfully captured and stabilized, an antenna enters a satellite tracking state, and inertial navigation data is continuously calibrated in the tracking state; wherein the phased-array antenna is divided into four array planes, namely an A array plane, a B array plane, a C array plane and a D array plane, and the receiving powers of the four array planes respectively correspond to the power PA, the power PB, the power PC and the power PD; the antenna is provided with four power detection circuits which are used for detecting the combined receiving power of the four array plane combinations, the combined receiving power corresponds to PA and PB, PC and PD, PA and PC, PB and PD, and the antenna beam pointing error is calculated and corrected. According to the invention, the attitude data can be calibrated in real time by receiving the signal, so that the cost and the design complexity of the phased-array antenna are reduced.

The application relates to a satellite mobile communication antenna adaptive beam prediction and control method, which comprises the following steps: collecting motion data of a user terminal, signal state data of a satellite antenna receiving end, satellite star-ground attitude data and ground environmental interference data, and processing to obtain a multi-source data set; based on the geometric correlation characteristics, gain correlation characteristics, sidelobe correlation characteristics and array element phase correlation characteristics of the multi-source data set and beam parameters, an associated matrix is constructed, the associated matrix is spliced with the multi-source data set, and a complete input feature set is obtained; a beam prediction model is constructed, and training and verification are performed; the beam prediction model output is converted into a control signal to drive the antenna array element adjustment, and based on the link signal-to-noise ratio, the bit error rate and the throughput collected by the user terminal, the model parameters are corrected, and the beam is split / combined. The application can improve the beam parameter prediction accuracy and environmental adaptability, suppress interference, optimize resource allocation, and guarantee stable and efficient satellite communication in a high dynamic complex environment.

The invention belongs to the technical field of communication, and particularly relates to a method comprising the following steps: S1, signal acquisition: on a satellite load side, acquiring a real-time position coordinate, a running speed vector and a carrier frequency of a satellite through a satellite-borne sensor and a communication link of the satellite; and S2, beam angle acquisition: according to the geographic position information of the ground-based beam center point, calculating to obtain an azimuth angle and a pitch angle of a satellite beam pointing to the center point by means of a space geometrical relationship between the satellite and the ground-based beam center point. According to the invention, the design of obtaining geographic position information by depending on a terminal GNSS module in the prior art is abandoned, and the time-frequency deviation is calculated by using the relative position relationship between the satellite and the ground-based beam center point, so that the influence of signal shielding, interference or fault of the GNSS system on the satellite communication system is avoided fundamentally; the continuity and the stability of the time-frequency compensation function of the satellite-ground transmission link are ensured, and the anti-interference capability and the operation reliability of a satellite mobile communication system are greatly improved.

The present application relates to a kind of low-orbit satellite switching methods based on double activation protocol stack, belong to satellite mobile communication technical field.The method includes: in low-orbit satellite network environment, design with the average rate of user equipment maximization and the switching interruption delay minimization as optimization target's switching architecture based on double activation protocol stack, and establish original optimization problem;Establish low-orbit satellite network multi-stage switching mechanism;Based on the multi-stage switching mechanism established, original optimization problem is decomposed into bandwidth allocation sub-problem and switching strategy sub-problem;Bandwidth allocation sub-problem is solved using alternate direction multiplier method;Switching strategy sub-problem is solved using simulated annealing algorithm;The final optimal solution is obtained by combining the solving results of bandwidth allocation sub-problem and switching strategy sub-problem.The present application can effectively deal with the challenge of frequent satellite switching and limited satellite resources in satellite network, while realizing high-speed, seamless connection, and improving user experience.

The invention discloses a satellite mobile communication system multi-broadcast frequency point parallel search method and device, and the method comprises the steps: obtaining a satellite digital intermediate frequency signal containing a plurality of target frequency bands, carrying out the digital down-conversion processing of the intermediate frequency signal through employing multiple channels, obtaining a baseband signal corresponding to each target frequency band, and transmitting the baseband signal to a receiver; performing cross-correlation operation on the baseband signal after downsampling and filtering processing and a local broadcast signal; and performing frequency domain transformation on a cross-correlation operation result, determining the maximum amplitude and the signal-to-noise ratio in the frequency domain data of each channel, screening the effectiveness of each channel according to the signal-to-noise ratio, and determining the position of the satellite by taking the beam direction corresponding to the maximum amplitude in the effective channel as the incoming wave direction of the broadcast signal. The real-time performance of signal searching in the multi-frequency-point environment is improved, the high signal detection capacity and anti-interference performance are shown in the complex electromagnetic environment, and the method has the advantages of being small in resource consumption, high in operation speed, stable in searching result and good in universality.

In a non-geostationary orbit (NGSO) satellite mobile communication system, a communication device receives a synchronization signal block (SSB), which is subjected to partial pre-compensation, from an NGSO satellite transmitter through a downlink (DL) beam, and then transmits the received synchronization signal block (SSB) to the NGSO satellite transmitter through the downlink (DL) beam. And realizing cell synchronization with the NGSO satellite transmitter by using the SSB subjected to partial pre-compensation. A center frequency of a primary synchronization signal and a center frequency of a secondary synchronization signal within the partially pre-compensated SSB are pre-offset by the NGSO satellite transmitter by an integer number of subcarriers relative to a center frequency of the partially pre-compensated SSB to achieve a correlation with movement of the NGSO satellite transmitter relative to the coverage on the earth of the DL beam According to the method, partial pre-compensation of Doppler shift (DS) is carried out. Even if Doppler frequency offset is large due to high mobility of an NGSO satellite, cell synchronization can be simplified.

The application provides a beam switching method, device and satellite mobile communication system, wherein a satellite terminal in the satellite mobile communication system has a first service communication module and a second service communication module. In the case that the first service communication module of the satellite terminal establishes a first service channel with an access network based on a first beam, if the satellite terminal detects that the satellite terminal is in a beam overlapping area of multiple beams, a second beam to be switched to is determined from the multiple beams; a second service channel is established with the access network based on the second beam through the second service communication module, and if the satellite terminal confirms that the second service channel has been successfully established, the first service channel between the first service communication module and the access network is released. The scheme of the application can improve the beam switching success rate.

The invention discloses a dynamic resource scheduling method of a satellite Internet of Things system, and relates to a wireless resource management technology in the field of satellite mobile communication. According to the method, how the satellite-borne base station allocates the time domain resources to the satellite terminals occupying the same frequency domain resources is described in detail. Efficient utilization of channel resources is realized mainly through a mechanism of periodic scheduling, distribution as required and scheduling information issuing. The method can be applied to a satellite Internet of Things system, is especially suitable for an emergent service scene, and can flexibly and dynamically adjust the allocation of the wireless resources according to the user number and the service volume of the current access terminal while reducing the pressure of a satellite platform, thereby improving the utilization rate of the space wireless resources and expanding the system capacity.

The invention discloses a paging method of a low earth orbit satellite system based on a wave position, and relates to the technical field of satellite mobile communication. The invention describes a network element deployment and process design method for paging in a low-orbit satellite system in detail. A paging area is delimited based on the geographic position of a terminal, paging is sent at a service beam position corresponding to the paging area, and meanwhile signaling beam paging is sent at a signaling beam position corresponding to the paging area. Through precise paging of the service beam and wide paging of the signaling beam, it is ensured that the terminal can receive the paging message no matter the terminal resides in the signaling beam or the service beam, and the paging success rate is improved. The method can be applied to a low-orbit satellite system paging scene, and the paging success rate can be effectively improved.

The invention provides an information communication system and method based on satellite mobile communication. The system comprises a gateway station which is used for receiving processing information of a user terminal through satellite mobile communication connection with the user terminal and sending the processing information to different data adaptation and access equipment of an information network application platform; the data adaptation and access equipment is used for receiving the processing information, analyzing the processing information and sending the analyzed application data to the application service equipment of the corresponding class; the application service equipment of the information network application platform is used for processing and storing the received application data of the corresponding class; and the data monitoring center is used for monitoring and acquiring target data in the application service equipment executing different types of application services. The system enhances the service diversity and improves the resource utilization rate.

The invention provides a communication situation sharing system and method based on satellite mobile communication. The system comprises a function management service layer used for monitoring information in a gateway station; the service information in the gateway station is managed, and based on the received service demand, target service information meeting the service demand in the managed service information is acquired; the interface interaction layer provides a communication interface between the function management service layer and a gateway station; and the front-end interaction layer provides an interaction interface for receiving business requirements, monitoring information in the gateway station and managing data, and displays the business information acquired by the function management service layer on the interaction interface. According to the system, the user terminal and the gateway station are connected through the satellite mobile communication system, so that sharing of communication situation information can be realized even if ground communication infrastructures are unavailable, and the communication reliability and coverage range are greatly improved.

This invention relates to the field of multi-carrier communication systems and proposes a blind RS detection method based on the similarity of adjacent subcarriers. It aims to solve the problem of high network signaling overhead caused by high-frequency RS signal transmission in dense, large-scale constellation scenarios, eliminating the need to rely on higher-layer signaling and dynamic control signaling to indicate the RS signal pattern. The method first obtains the estimated frequency response sequence of the subcarrier channel corresponding to the RS symbol. Then, through N parallel processing units, it performs differential, modulus-square, and accumulation operations on the N RS patterns supported by the system to obtain the frequency response differential power sum of each pattern. Finally, it retrieves the branch corresponding to the minimum value, and the associated RS pattern is the detection result. This invention designs two implementation schemes: parallel accumulation and sequential accumulation. The former improves detection efficiency, while the latter has low logic resource consumption and is easy to implement in hardware. It is applicable to various multi-carrier systems such as cellular mobile communication, satellite mobile communication, and non-terrestrial network communication.

The present application relates to a voice encryption method for a satellite mobile communication system in the technical field of communications. The method comprises: modifying a Tiantong terminal so that the Tiantong terminal can communicate with a cryptographic device; providing a voice encryption function only by adding an encryption and decryption driver and a cluster vocoder on a satellite mobile communication software protocol stack conforming to the Tiantong protocol standard, so as to realize the voice encryption and decryption function of a cluster service, thereby eliminating the need for changing a core network configuration; the Tiantong terminal interacting with the cryptographic device to obtain a synchronization frame, a key stream, a frame number, encryption control information, etc. required for a voice encryption and decryption process; and the Tiantong terminal interacting with the cryptographic device to obtain an encrypted voice frame number, embedding the frame number into a voice and transmitting the voice to a receiving end, and the receiving end sending the voice to the cryptographic device to obtain a decrypted voice, thereby completing encrypted communication. The voice encryption method in the present application achieves the security requirements of satellite mobile communication systems on the basis of minimal modification.

The invention provides a satellite mobile communication downlink channel quality reporting method. In a low-orbit narrowband satellite mobile communication system, when the number of data verification failures in the process of analyzing a downlink data packet by a terminal side reaches a preset threshold value, the terminal side reports downlink channel quality to a network side, and active reporting of the downlink channel quality is realized; and when the terminal side receives the downlink data packet sent by the network side, obtaining the reporting indication from the header information of the downlink data packet, and reporting the downlink channel quality to the network side by the terminal side, thereby realizing passive reporting of the downlink channel quality.