21 results about "Satellite downlink" patented technology

The invention discloses a method for aggregating ocean buoy data, which comprises the following steps of: establishing a space-time correlation model according to the spatial distribution density of buoy clusters and the dynamic characteristics of an ocean environment, and adaptively dividing buoy groups with a data compression cooperative relationship; performing a data-related compression operation within the buoy group; constructing a transmission priority dynamic sorting engine, and calculating a dynamic weight coefficient; performing hierarchical packaging processing on the differential coding data, distributing enhanced forward error correction coding resources for high-priority data, and reserving redundant transmission time slots; the method comprises the following steps: receiving a hierarchical data packet through a low-orbit satellite and executing on-satellite preprocessing, reconstructing an original data stream by using a distributed decoder, and meanwhile, fusing multi-dimensional space-time related data to generate an aggregated data product; and finally, the aggregated data product is transmitted to a ground data center through a satellite downlink. According to the invention, uplink data volume is reduced, disaster monitoring timeliness is improved, ground station processing load is reduced, and system environment adaptability is enhanced.

The invention discloses a Starlink satellite downlink signal timing synchronization method based on deep learning, and the method comprises the steps: firstly carrying out the segmentation cross-correlation preprocessing of a received signal, and generating a two-dimensional real number feature map with significant spectral line features; then, an improved SS-YOLOv9 network model is constructed and trained, according to the model, in a YOLOv9 infrastructure, a lightweight SimAM saliency attention module is embedded into a backbone network to enhance feature separability, an FAF adaptive feature fusion module is introduced into a path aggregation structure of a neck network to optimize multi-scale feature fusion, and the feature fusion is optimized; precise positioning is realized by adopting a decoupling detection head and a coordinate attention mechanism; and finally decoding bounding box coordinates output by the network into timing synchronization points in original signals. According to the method, the problem that the performance of a traditional method is sharply deteriorated in a severe channel environment is effectively solved, and the method has high precision, high robustness and excellent environmental adaptability.

The invention provides a high-mobility platform random access method and system for a low-orbit satellite data chain, and the method comprises the steps: taking a satellite ephemeris and platform navigation information as initial guidance, receiving and analyzing a satellite downlink signal, and carrying out the joint estimation to obtain a space-time frequency parameter; based on the estimated timestamp as a time reference of a frequency hopping pattern, driving a local frequency hopping sequence generator, predicting and verifying the current frequency hopping pattern, and performing frequency offset correction according to the estimated Doppler frequency offset; and in response to successful verification of the frequency hopping pattern, constructing a pre-compensated uplink and starting a frequency hopping pattern tracking loop for fine tuning of the time-space-frequency parameter and the frequency hopping pattern phase, so that the user accesses the low-orbit satellite data link at random and enters steady-state communication. The time-space-frequency alignment problem and the time-varying frequency hopping pattern capturing and tracking problem are synchronously solved, and rapid, reliable and anti-interference random access of the high-mobility platform is achieved.

The invention discloses a monopulse phase comparison tracking signal processing method based on a digital beacon receiver, and relates to the technical field of radio orientation, and the method comprises the steps: carrying out the antenna pointing deviation analysis of a shipborne communication-in-motion antenna according to the predicted ship attitude information in a preset time window, and obtaining a predicted pointing deviation angle sequence; carrying out feature extraction to obtain a directional deviation trend feature, and determining the resolving complexity of four paths of radio frequency signals of the shipborne communication-in-motion antenna; dynamically configuring the phase comparison algorithm processing precision, the filtering processing mode and the signal compensation mechanism of the digital beacon receiver, and generating an adaptive signal resolving process; and according to an adaptive signal resolving process, resolving the continuous wave satellite downlink beacon signal in the preset time window through a digital beacon receiver to obtain a monopulse phase comparison tracking signal, and regulating and controlling the orientation and pitching of the shipborne communication-in-motion antenna in real time. According to the invention, the technical problem of poor radio orientation effect in the prior art is solved.

The application provides a satellite navigation signal abnormal reason analysis method, establishes a satellite signal transmission channel combination distortion model, generates an ideal signal, and constitutes a combination distortion distortion model library; collects measured satellite downlink signal data to obtain a measured signal quality evaluation result, compares and analyzes the measured signal quality evaluation result with a set evaluation index, finds out a group of the most matched evaluation result data and pre-stored data in the distortion model library; and according to the best matching relationship between the measured satellite signal evaluation result and the distortion model library data, obtains the corresponding satellite signal transmission channel distortion condition. The application can efficiently and credibly give an abnormal signal specific reason analysis result, helps a navigation system to quickly lock the signal abnormal reason, and provides valuable reference and important support for channel distortion compensation and stable operation of the system.

The application discloses a low-orbit satellite navigation enhancement and ground CORS cooperative system and relates to the technical field of satellite navigation positioning, which comprises a space segment, a ground segment and a user segment; the space segment comprises a low-orbit satellite and is used for broadcasting navigation enhancement signals; the ground segment comprises an enhanced CORS network and a star-ground cooperative control center; each ground reference station simultaneously receives GNSS signals and navigation enhancement signals and generates observation data; the star-ground cooperative control center performs precise orbit determination based on low-orbit satellite downlink data and observation data, and uploads star-ground calculation results to the low-orbit satellite to update the generation parameters of the navigation enhancement signals; the user segment comprises a hybrid enhancement receiver, which is used for receiving GNSS signals, navigation enhancement signals and differential data and performing multi-source fusion positioning calculation. The application can improve the low-orbit satellite orbit determination precision, shorten the user initialization time, expand the service coverage, reduce the system construction cost and enhance the integrity guarantee capability.

Embodiments of the present disclosure are directed to systems and methods for enhanced multi-satellite downlink connectivity. Each of two or more extraterrestrial base stations communicate data in a downlink to a single user equipment (UE). Encoding each downlink with a different and orthogonal code permits the re-use of at least partially overlapping frequency resources without intra-channel interference. The separated data streams can be used either to provide additional redundancy when the same data is communicated on each stream or to increase throughput when at least partially different data is communicated on each stream.

The invention relates to a high-efficiency high-capacity space-based Internet of Things access method, which comprises the following steps of: firstly, assisting a user terminal to perceive a link state by using an on-satellite demodulator, and then dynamically broadcasting the working state of an uplink demodulator through a satellite downlink modulator, so that the link throughput rate of uplink random access is improved. According to the invention, the global terminal position management characteristic of the service operation center of the constellation system is utilized to form the dynamic terminal random sending probability parameter under the coverage of the satellite beam, and the dynamic terminal random sending probability parameter is broadcasted to the user terminal in real time through the satellite, so that the data sending probability parameter of the terminal is dynamically changed, and the throughput rate of user link random access is optimized from the system level.

A non-terrestrial radio network node may determine a count, or a number, of user equipment being served by, or that are connected to, the node via at least one non-terrestrial beam. The node may analyze the count, or number, with respect to at least one power increase criterion or at least one power decrease criterion. With respect to a baseline / default power allocation, the node may increase or decrease transmission power allocated to a particular non-terrestrial beam if the beam is determined to serve a number of user equipment that exceeds a configured power increase criterion or that is less than a configured power decrease criterion, respectively. The node may increase or decrease transmission power allocated to a non-terrestrial beam according to a configured power change step value. Based on counts of user equipment served by different beams, the node may determine to allocate different transmission power amounts to different beams.

The invention discloses a communication and navigation integrated implementation system and method of a low earth orbit satellite Internet of Things system. The system comprises a low earth orbit satellite module, a ground terminal receiving module, a positioning and parameter calculation module, an access control and compensation module and an uplink communication link establishment module. A positioning measurement signal is introduced into a satellite downlink NB-IoT (Narrow Band Internet of Things) or eMTC (Enhanced Machine Type Communication) signal, so that a ground terminal can simultaneously complete positioning data acquisition, optimal satellite selection and time and frequency compensation of an uplink signal, thereby effectively solving the problems of low access efficiency and difficulty in synchronization and compensation in the prior art. According to the invention, deep fusion of communication and navigation is realized, the access speed and reliability of the low-orbit satellite Internet of Things system are improved, and the method has good application prospect and popularization value.

The invention discloses a remote sensing satellite downlink data instant service method and system and electronic equipment, and relates to the technical field of remote sensing information engineering or other related technical fields. The method specifically establishes remote sensing information instant service integrating satellite downlink data access, satellite downlink data instant geometric positioning, target information rapid extraction and remote sensing information active service, and comprises the following steps: accessing received remote sensing satellite downlink data, and obtaining the remote sensing satellite downlink data; carrying out geometric correction on the satellite downlink data by adopting a multi-satellite image collaborative uncontrolled geometric positioning strategy to obtain instant geometric positioning data; inputting the real-time geometric positioning data into a deep learning model of predetermined ground object target identification to obtain specific target thematic information; and intelligently pushing a corresponding image content text description corpus generated based on the instant geometric positioning data and the target thematic information to the user, and optimizing an image cognition calculation model by using information fed back by the user, thereby improving the precision of a remote sensing data information service product.

The invention provides a plasma detection data calibration method and device, a medium and electronic equipment. The method comprises the following steps: acquiring a downlink plasma data sequence of a satellite; performing noise separation processing on the plasma data sequence; based on a preset correlation model of plasma data and space environment parameters, according to the space environment parameters when the plasma data sequence is collected, determining target reference values corresponding to the plasma data at all moments of the plasma data sequence; and based on the plasma data of the plasma data sequence at each moment and the target reference value, performing calibration processing on the plasma data to obtain calibrated plasma data. According to the invention, high-quality conversion from original, noisy and environment-interfered observation data to calibration data is realized, and a data foundation is laid for subsequent establishment of an accurate plasma environment model and reliable space weather forecast.

This invention relates to an uplink power control method and control device for a satellite communication system. The uplink power control method for the satellite communication system includes: S100, acquiring the downlink signal strength P0 of the satellite under clear sky weather conditions; S200, at t i Continuously measure the signal strength P of the satellite downlink under severe weather conditions i S300, based on P0 and P i Calculate the downlink signal attenuation value Ad i S400 divides the uplink frequency band into multiple sub-bands, according to Ad... i Calculate the signal attenuation value Au for each uplink sub-band. ki S500, according to Au ki Adjust the compensation attenuation value A of the corresponding sub-band ki This can effectively reduce uplink power compensation errors in satellite communication systems and improve the control accuracy of uplink power.

The application discloses a kind of low-orbit satellite signal frequency estimation method and system based on Kalman neural network, mainly solve the problem of low frequency estimation precision and poor robustness in non-cooperative high dynamic scene in prior art.The scheme is: initialization parameter, generate carrier wipe-off signal to wipe off received signal carrier, calculate the remaining frequency estimation value, and obtain the measurement value by observation;Build an end-to-end network model including high dynamic feature extraction unit, two-layer gated recurrent unit, self-attention fusion unit and constrained output unit;The network model is supervised and trained using the measurement value and state estimation increment;The measurement value and state estimation increment are input into the trained network, and the Kalman gain prediction value is output, the state posteriori estimation value at the current time is calculated as the input for the next time cycle update, to realize continuous online high-precision estimation of satellite signal frequency.The application can realize real-time, robust and high-precision estimation of low-orbit satellite downlink signal frequency, and can be used for non-cooperative satellite navigation and positioning.

This invention relates to the field of satellite remote sensing data processing technology, and in particular to a method for rapid screening of raw payload bitstreams based on an orbit extrapolation model. The method includes the following steps: a ground system receives the raw payload bitstream from the downlink satellite in real time; based on a pre-constructed imaging geometry model and the extrapolated precise orbit information of the imaging arc segment, the starting position of the raw bitstream data containing the target geographic region within the raw payload bitstream is predicted; using data packets as processing units, starting from the starting position, multiple data packets are processed in parallel with decryption, decompression, and raw bitstream data segment selection to extract the target bitstream segment corresponding to the target geographic region; based on the target bitstream segment, a level 0 slice product is generated and output. This invention improves the preprocessing efficiency of the ground receiving system, shortens the cycle from remote sensing data acquisition to application, and reduces the burden on subsequent processing through accurate target data extraction.

Systems, devices, software, and methods of the present invention enable frequency-based signal power analyses in software suitable for signal with either stationary or non-stationary spectrums. The methods that may be used throughout various systems including transmitters receivers, repeater, controllers, monitors, etc. and in software simulators to enable various signal power calculations and analyses, such as frequency spectrum analysis, throughout operating systems and that may be consistently applied in system design and operation simulations in a wide range of applications, such as medical data analysis, interference and spectrum monitoring or clearance, object tracking, transmission channel and noise analyses, radiated power analysis, signal boundary interference, satellite downlink signal identification, pulsed radar monitoring, audio detection and identification, lidar systems, sonar systems, medically active decision sensors to monitor but not limited to; EEG, ECG, pulse rate, inhaled gases, hazardous material and chemically charged environment, etc.

A non-terrestrial radio network node may determine a count, or a number, of user equipment being served by, or that are connected to, the node via at least one non-terrestrial beam. The node may analyze the count, or number, with respect to at least one power increase criterion or at least one power decrease criterion. With respect to a baseline / default power allocation, the node may increase or decrease transmission power allocated to a particular non-terrestrial beam if the beam is determined to serve a number of user equipment that exceeds a configured power increase criterion or that is less than a configured power decrease criterion, respectively. The node may increase or decrease transmission power allocated to a non-terrestrial beam according to a configured power change step value. Based on counts of user equipment served by different beams, the node may determine to allocate different transmission power amounts to different beams.

The application discloses a single-pulse phase comparison tracking signal processing method based on a digital beacon receiver and relates to the technical field of radio orientation. The method comprises the following steps: performing antenna pointing deviation analysis on a shipborne moving target indication (MTI) antenna according to predicted ship attitude information in a preset time window to obtain a predicted pointing deviation angle sequence; performing feature extraction to obtain a pointing deviation trend feature and determine the calculation complexity of four radio frequency signals of the shipborne MTI antenna; dynamically configuring the phase comparison algorithm processing precision, filtering processing mode and signal compensation mechanism of the digital beacon receiver to generate an adaptive signal calculation process; and performing calculation and processing on continuous wave satellite downlink beacon signals in the preset time window through the digital beacon receiver according to the adaptive signal calculation process to obtain a single-pulse phase comparison tracking signal and perform real-time regulation and control on the azimuth and elevation of the shipborne MTI antenna. The application solves the technical problem of poor radio orientation effect in the prior art.

This invention discloses a method for low-Earth orbit (LEO) satellite interference modeling and performance analysis based on beam hopping, relating to the field of LEO satellite communication technology. The method includes: S1) establishing a LEO satellite downlink communication scenario and setting cell layout scenario parameters within the coverage area; S2) calculating path loss and channel distribution under fading based on the cell layout scenario parameters; S3) designing a periodically polled beam hopping time schedule and selecting random beam hopping and non-beam hopping time schedules as comparison schemes for interference analysis; S4) establishing a beam hopping-based LEO satellite interference model based on path loss, fading channel distribution, and the beam hopping time schedule, and simulating and comparing inter-beam interference and system performance under periodically polled beam hopping, random beam hopping, and non-beam hopping time schedules. The beam hopping-based LEO satellite interference model of this invention can be used for performance simulation analysis of beam hopping satellite communication networks and provides theoretical and technical support for system design.

The invention relates to a PDT and satellite voice air-ground intercommunication method and device of a handheld terminal and the terminal, and the method comprises the following steps: S1, obtaining a satellite downlink audio stream and a local microphone audio stream, and carrying out the first-path sound mixing of the satellite downlink audio stream and the pure local human voice to generate a first mixed audio; s2, voice activity detection is carried out on the first mixed audio, a virtual PTT control signal is triggered when effective voice is detected, suspension time is adaptively adjusted based on satellite network jitter, and the first mixed audio is sent to a PDT network; s3, acquiring a PDT downlink audio stream and a local microphone audio stream, performing second-path audio mixing to generate a second mixed audio, and sending the second mixed audio to a remote command center; and S4, carrying out third-path sound mixing on the satellite downlink audio stream and the PDT downlink audio stream, and outputting to a local loudspeaker. The method has the beneficial effects that the load of an individual soldier is greatly reduced, voice word loss and interruption are avoided, echoes can be effectively eliminated, and PTT trigger delay is remarkably reduced.