105 results about "Satellite system" patented technology

A method (900) by a user equipment, UE, (112) for determining the validity of Global navigation satellite system, GNSS, data, includes maintaining (902) at least one validity timer for determining whether the GNSS data is valid or not valid.

To provide a method of routing data traffic in non-geostationary orbit (NGSO) satellite systems.SOLUTION: The method utilizes, at satellites 102-107, backbone route tables that define different snapshots of time-varying backbone topology of an NGSO satellite system 100. Because each satellite 102-107 may refer to a different portion of the backbone topology, the backbone route tables at the satellites 102-107 are different from each other. In addition, the backbone route tables at the satellites 102-107 are active at different times because the backbone topology changes over time. Different routing groups of backbone route tables are defined to realize different routing options for packets arriving at the satellites 102-107.SELECTED DRAWING: Figure 1

The present disclosure provides an adaptive complex positioning method and apparatus which may combine measurement information about a wireless communication infrastructure, installed near a take-off and landing point of air mobility, with information obtained from a sensor equipped in air mobility and may thus have high position accuracy in a complicated center of a city also, in order to solve a problem where the position accuracy of a conventional global navigation satellite system (GNSS) is lowered in a complicated center of a city.

Methods and apparatus for localizing a user equipment (UE) in an environment of a wireless network are provided. Techniques may include requesting positioning information from an entity of the wireless network via vehicle-to-everything (V2X) communication; obtaining sensor data responsive to an inability to localize the UE using the V2X communication, the sensor data including data representative of the environment which is received via a Global Navigation Satellite System (GNSS) receiver, an inertial sensor, an optical sensor, a radio frequency (RF) sensor, or a combination thereof; determining a position of the UE within a plurality of defined positions in the environment using a sensor-based localization process, based at least on correlation of map data of the environment with the sensor data.

Example embodiments relate to train data recorder and event notification systems and techniques for using such systems. An example device includes a housing configured to attach onto a train with multiple sensors located in the housing, such as a Global Navigation Satellite System (GNSS) receiver, an inertial measurement unit (IMU), and a camera that can capture images of an environment outside the housing. The device also includes a memory and a processor located inside the housing where the processor is configured to receive sensor data from at least one of the sensors and store the sensor data on the memory. A central computing system can aggregate location-based data generated by train data recording devices positioned on one or multiple trains and map the data to the network of train tracks to detect trends and provide insights to operators.

The objective of the proposed invention is to make it possible to mount the multifunctional mobile module onto the roof of any vehicle to turn it into an autonomous vehicle by providing all the functions of an autopilot system within a single module, ensuring the operability of the module within a wide range of ambient temperatures (−40° C. to +50° C.), as well as within a wide range of weather conditions (rain, downpour, snow) by means of a thermal management system (TMS) and sensor cleaning systems that are integrated into the body of the module.The multifunctional mobile module for automatic vehicle control comprises an underframe made of a metal profile and equipped with metal brackets that hold screw-connected sensors (cameras, a lidar, an inertial navigation system, a Global Navigation Satellite System (GNSS) receiver), equipment (calculators, fans, heaters, network switches, a peripherals controller, GSM (Global System for Mobile Communications) antennas, sensor cleaning system components), and an outer plating that is also mounted onto the underframe.

A method and apparatus for positioning a vehicle in a complex environment, a device, and a storage medium. The method comprises: during driving of a vehicle, a vehicle controller (10) acquires, by means of a positioning device (20) on the vehicle, real-time global navigation satellite system data of the vehicle, and continuously acquires, by means of a camera device (30) on the vehicle, image frames in a driving environment (201); when an error of the global navigation satellite system data reaches an error condition, the vehicle controller (10) determines initial data, the initial data referring to, among global navigation satellite system data respectively acquired at a plurality of time points, global navigation satellite system data having an error not reaching the error condition and having a latest acquisition time (202); on the basis of the image frames respectively acquired at the plurality of time points, the vehicle controller (10) determines real-time relative motion information of the vehicle, the relative motion information comprising at least one of a moving distance and a rotation angle (203); on the basis of the initial data and the relative motion information, the vehicle controller (10) determines real-time positioning data of the vehicle (204); and the vehicle controller (10) corrects the positioning data using real-time kinematic technology, and obtains real-time target positioning data of the vehicle (205).

A satellite communication method and apparatus are provided, and are applied to the field of communication technologies. The method includes: A communication apparatus may determine that the communication apparatus is allowed to perform a global navigation satellite system (GNSS) measurement in a connected-discontinuous reception (C-DRX) inactive state, and then perform the GNSS measurement based on a relationship between an end moment of the C-DRX inactive state and a GNSS validity period. In an example, the end moment of the C-DRX inactive state may be within the GNSS validity period. In another example, the end moment of the C-DRX inactive state may be outside the GNSS validity period. Based on different relationships, the communication apparatus may perform the GNSS measurement in different time periods, or report GNSS validity duration at different times, or the like.

Various solutions for connected mode measurement enhancements in global navigation satellite system (GNSS) operations are described. A device can connect to a serving cell associated with a first non-geosynchronous orbit (NGSO) satellite to operate in a connected mode. The device can also receive, from the serving cell, a configuration of one or more neighboring cells associated with a second NGSO satellite. The serving cell and the one or more neighboring cells operate within a same frequency band. The device can then perform, based on the configuration, inter-frequency measurements of the one or more neighboring cells if at least one condition is satisfied.

an LEO satellite includes a light projecting element that emits emission light to another LEO satellite, an optical telescope, an optical phased array, a light receiving element that receives incident light from the other LEO satellite, a distance measurement unit that measures a distance to the other LEO satellite based on at least one of the emission light and the incident light, and a control unit. The control unit captures the other LEO satellites by scanning emission light using the optical telescope and receives incident light from the other LEO satellites for the other LEO satellites on the same orbital plane, and captures the other LEO satellites by scanning emission light using the optical phased array and receives incident light from the other LEO satellites for the other LEO satellites on different orbital planes.

Aspects of the present disclosure relate to timing synchronization in global navigation satellite system (GNSS) interrupt scenarios. An apparatus, such as a user equipment (UE), receives a first signaling including a connectivity indication indicating whether to maintain a connected state or an idle state during a GNSS interruption. The apparatus receives a second signaling that includes a timing advance adjustment procedure to apply to timing synchronization during the GNSS interrupt. The apparatus performs uplink timing synchronization based at least in part on the first signaling and the second signaling.

This invention discloses a method and related equipment for predicting the visibility of low-Earth orbit (LEO) satellites without prior information. It relates to the field of signal processing technology for LEO satellites in GNSS (Global Navigation Satellite System). The method includes: acquiring the LEO satellite; tracking the LEO satellite when it is successfully acquired; monitoring and recording the tracking parameters of the LEO satellite while tracking is active; recording the continuous invisible time of the LEO satellite when tracking is lost; obtaining the current tracking parameters and comparing them with historical tracking parameters when the LEO satellite is reacquired and re-enters tracking mode to determine the consistency between the two tracking states; and estimating the remaining invisible time based on the current time, the recording time of the historical tracking parameters, and the continuous invisible time of the LEO satellite. This invention achieves effective prediction of the visibility of LEO satellites.

Described are methods and systems for single-board satellite architectures.

This application relates to the field of positioning technology, and discloses a method, apparatus, device, and readable storage medium for measuring the position of a single-antenna receiver. The method includes: placing a centering rod at a target position and acquiring first data from the inertial measurement unit (IMU) of the single-antenna receiver and global navigation satellite system (GNSS) data; initializing the attitude information of the single-antenna receiver based on the first IMU data and GNSS data; acquiring second IMU data from the single-antenna receiver, and determining the target positioning information of the target position based on the attitude information, the second IMU data, the GNSS data, and a preset zero-velocity constraint. Initialization is completed using only the IMU data and GNSS data of the single-antenna receiver, while the target positioning information is determined by combining the zero-velocity constraint, enabling the single-antenna receiver to achieve rapid attitude initialization and high-precision position measurement without external auxiliary sensors.

The paper presents a high-latitude ionospheric scintillation intensity prediction method, belonging to the field of space weather monitoring and satellite navigation technology. The low-frequency trend item, high-frequency non-stationary item and residual item are generated by using the time series of high-latitude ionospheric phase scintillation factor. The high-latitude ionospheric scintillation intensity prediction model is constructed by using the ionospheric phase scintillation factor and the target physical characteristics. The prediction value is generated by using the low-frequency trend item to train the multivariate CNN-BiLSTM-Attention. The prediction value is generated by using the high-frequency non-stationary item and the residual item to train the single variable CNN-BiLSTM-Attention. The ionospheric scintillation intensity can be predicted by combining the trained high-latitude ionospheric scintillation intensity prediction model. The method can effectively improve the accuracy, stability and cross-station migration ability of multi-step prediction of scintillation in complex ionospheric environment, and provides a means for studying ionospheric disturbance law and improving the reliability of high-precision application of global navigation satellite system.

Proposed is a global navigation satellite system (GNSS) signal output apparatus. The GNSS signal output apparatus may include a reference receiver arranged within a GNSS shadow zone and configured to receive a reference satellite signal in a 360-degree range, and a plurality of repeater devices arranged within the GNSS shadow zone, configured to receive a directional satellite signal with a reception angle in an angular range of less than 360 degrees, and configured to radiate the received directional satellite signal. The plurality of repeater devices may be spaced apart from each other and may have different ranges of reception angles, and a sum of reception angles of the plurality of repeater devices may cover a range of 360 degrees, and each of the plurality of repeater devices may adjust a range of the reception angle based on the reference satellite signal received by the reference receiver.

This invention belongs to the field of satellite navigation and avionics technology, and proposes a deep learning-based adaptive integrity enhancement method and system for ionospheric scintillation-multipath coupling. The method includes: S1, signal data acquisition and preprocessing; S2, disturbance feature extraction and state identification; S3, generation of a comprehensive disturbance intensity index; S4, calculation of the adaptive Sigma expansion coefficient; S5, integrity calculation; and S6, integrity enhancement and adaptive optimization. This invention improves the integrity accuracy and reliability of navigation systems in complex signal environments, ensuring that the airborne equipment of the Global Navigation Satellite System (GLS) meets airworthiness standards during the CAT II / III precision approach phase.

Competing tradeoffs of overall footprint, weight, and performance impact the design of antennas for many applications. However, those for compact portable devices or mobile platforms exploiting global navigation satellite systems these are further compounded by seeking good performance over a wide angular range. Accordingly, it would be beneficial to provide designers of a wide range of electrical devices and systems with compact broadband antennas which offer a low vertical profile relative to that provided by the common filar element approaches for high precision applications. Accordingly, through a combination of a dipole, a parasitic element, and additional ground elements to a convention ground plane the inventors provide broadband high performance antenna designs with low profile and low overall footprint.

This invention relates to the field of mobile track geometry state detection technology, and discloses a real-time track state detection method based on multi-sensor fusion and dynamic compensation. It collects multi-source synchronous data from a global navigation satellite system receiver, inertial measurement unit, and laser profilometer mounted on the vehicle body, as well as accelerometers mounted on the bogie, and performs time synchronization and coordinate system unification. Through dynamic error correction and extended Kalman filtering fusion, it achieves high-precision estimation of vehicle attitude, velocity, and position. First-level point cloud motion compensation eliminates spatial distortion caused by the rigid body motion of the vehicle itself on the point cloud collected by the laser profilometer. Second-level point cloud motion compensation eliminates residual geometric errors caused by high-frequency vibration of the bogie. Finally, track geometric parameters are extracted and smoothness analysis is performed. This invention achieves high-precision reconstruction of track point clouds, providing technical support for real-time, high-precision track state monitoring on operating trains.

This invention discloses an intelligent analysis method for bridge inspection using an unmanned aerial vehicle (UAV) remote sensing platform. To address the problem of high-precision mapping and re-inspectionable localization of bridge defects from pixel coordinates, and to suppress localization drift under occlusion and multipath conditions caused by the Global Navigation Satellite System (GNSS), this invention collects and time-aligns image sequences, inertial measurement data, and GNSS observations. Based on satellite geometry and signal quality, it performs multipath evaluation, outputting reliability scores and observation biases, and corrects these biases. A factor graph containing inertial, visual, and GNSS constraints is constructed, and a switch variable is introduced for the GNSS constraints. Prior values ​​are set based on the reliability score to adaptively adjust weights. Nonlinear optimization is performed to obtain the pose sequence and covariance. Furthermore, a transformer matching method is used to generate closed-loop constraints. A joint decision is made combining matching confidence, pose covariance, and reliability score, and weighted additions are added to the factor graph for update optimization. Defect detection is performed on the images to obtain defect pixel coordinates, and back-projection is used to intersect the bridge component model to obtain component identification and 3D position. A re-inspection localization range is generated based on covariance propagation. This achieves the technical effect of high-precision localization of bridge defects and output of a re-inspectionable range.

An electronic device may communicate with a non-terrestrial network (NTN) using an external clock of the NTN. The electronic device may determine the external clock to communicate with the NTN. The device may receive an indication of the external clock from a global navigational satellite system (GNSS) or from interfering signals. The interfering signals may at least partially mask GNSS signals. A nearby device may be transmitting the interfering signals to the NTN using the external clock. The nearby device may embed a predetermined pattern of quiet periods or transmission gaps with each frame cycle of the external clock. The electronic device may determine a relationship (e.g., time duration offset) between the quiet periods of the predetermined pattern of quiet periods and frame boundaries of the frame cycles of the external clock. As such, the electronic device may communicate signals with the NTN despite the GNSS signals being masked.

The application discloses a satellite attitude system preset performance tracking control method based on a second-order disturbance observer, first, combining the rigid body satellite dynamics and kinematics equation, the state prediction error is introduced into the structure of the traditional second-order disturbance observer, the improved second-order disturbance observer is designed, the influence of high-frequency noise is weakened while the disturbance is estimated and compensated under the condition of low gain; secondly, the tunnel type performance function is introduced in the error conversion process, the transient and steady state performance of the attitude tracking error is improved; then, combined with the disturbance estimation result, a disturbance fault-tolerant auxiliary system is constructed, the performance boundary is flexibly adjusted by generating a disturbance non-negative correction signal, the influence of strong mutation disturbance is reduced, and the robustness of the system is guaranteed; finally, a preset performance anti-disturbance controller is designed for the satellite system, and high-precision attitude tracking control is realized. The application has higher efficient estimation performance and more accurate control precision, and effectively improves the anti-interference ability of the satellite system.

Some embodiments of the invention relate to methods carried out by a navigation satellite system (NSS) receiver for estimating parameters useful to determine a position. The NSS receiver observes NSS signals from a plurality of NSS satellites. The method comprises performing a delta-carrier-phase-observables-computation procedure. It is further determined whether a criterion, indicative of (i) continuity of carrier phase measurements from an anchor epoch to a terminus epoch, and / or (ii) stability of NSS satellite measurement geometry from the anchor epoch to the terminus epoch, is satisfied, and, if not, the anchor epoch is moved forward. Then, after determining whether the criterion is satisfied and after either moving the anchor epoch or not, the delta-carrier-phase-observables-computation procedure is performed again for a new terminus epoch. Systems and vehicles using such a method are also disclosed.

The embodiment of the application provides a communication link intelligent dynamic switching method and system based on Beidou and low-orbit satellites, relates to the technical field of satellite communication, and first receives a Beidou satellite signal frame structure set and a low-orbit beacon beam scanning sequence, carries out cross-system time reference unification processing to generate a time synchronization offset set, then constructs an interactive trigger point positioning mapping table, which contains an interactive satellite combination identifier and a beam coverage overlapping area coordinate range, when a user terminal link switching request instruction is received, the mapping table is called to match trigger point coordinates, a link dynamic switching relay instruction is generated and sent to a user terminal baseband processing unit, and cross-satellite system signal acquisition and synchronization establishment operations are triggered to be performed. The application improves the accuracy and reliability of satellite communication link switching.

This application provides an antenna for a high-Earth orbit (HEO) and low-Earth orbit (LEO) integrated satellite communication terminal, and the HEO and LEO integrated satellite communication terminal. The antenna of the HEO and LEO integrated satellite communication terminal includes: a frustum-shaped antenna substrate; a HEO satellite communication module including multiple HEO phased array antenna elements distributed on the upper surface of the frustum-shaped antenna substrate; a LEO satellite communication module including multiple LEO phased array antenna elements distributed on the side surface of the frustum-shaped antenna substrate; and a Global Navigation Satellite System (GNSS) module including a GNSS antenna disposed at the center of the upper surface of the frustum-shaped antenna substrate. This application improves the satellite switching speed of the antenna. This application also provides a HEO and LEO integrated satellite communication terminal.

The application relates to an atmospheric precipitable water estimation method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring observation data of a plurality of global navigation satellite system stations, first atmospheric precipitable water of a plurality of European Centre for Medium-Range Weather Forecasts grid positions, sounding atmospheric precipitable water and position information of a to-be-measured position in a to-be-measured area; according to the observation data of the plurality of stations, second atmospheric precipitable water and precipitation uncertainty of the corresponding stations are solved; based on the first atmospheric precipitable water, the sounding atmospheric precipitable water, the second atmospheric precipitable water, the precipitation uncertainty and fitting parameters, a target function is determined, and the fitting parameters corresponding to the function value convergence of the target function are taken as target fitting parameters; and based on the target fitting parameters and the position information of the to-be-measured position, the atmospheric precipitable water at the to-be-measured position is determined. The method can improve the atmospheric precipitable water estimation result acquisition efficiency.

Systems and methods for verifying global navigation satellite system (GNSS) space vehicle (SV) signals are disclosed. An extremely weak frame synchronization (EWFS) verification process is run on a current SV signal relative to another verified SV signal. An indication of frame synchronization completion for the current SV signal is set after a full frame synchronization occurs based on a peak EWFS correlation value for the current SV signal being equal to or greater than a first threshold. The indication can be set early based on the peak EWFS correlation value for the current SV signal being greater than a second threshold, the second threshold being greater than the first threshold. Tracking of the current SV signal can be terminated early based on the peak EWFS correlation value for the current SV signal being less than a third threshold, the third threshold being less than the first threshold.

This application relates to the communication field, and discloses a communication method and apparatus, to improve a success rate of GNSS measurement. The communication method is applied to a terminal. The terminal is configured with a first time interval for global navigation satellite system measurement, and is further configured with a second time interval for radio resource management measurement. The first time interval and the second time interval at least partially overlap. The method includes: performing global navigation satellite system measurement by using the first time interval, and performing radio resource management measurement by using a third time interval, where the third time interval is a time interval obtained by delaying the second time interval, and the third time interval is determined based on the second time interval and a completion time of global navigation satellite system measurement.