19 results about "BeiDou Navigation Satellite System" patented technology

The invention discloses a dual-mode direct position estimation receiver positioning method based on a GPS L1 / BDS B1C signal. The method comprises the following steps: predicting a priori value of a state quantity of a current epoch dual-mode DPE receiver; decomposing the priori value into a position-clock difference domain priori value and a speed-clock drift domain priori value; generating a five-dimensional position-clock difference domain grid space and a five-dimensional speed-clock drift domain grid space; calculating a correlation function and a Doppler spectrum of each visible satellite in the current epoch receiving data; calculating joint accumulation of a position-clock difference domain grid space and a speed-clock drift domain grid space; forming a state quantity observation value of the current epoch; and obtaining a navigation solution of the current epoch dual-mode DPE receiver. The method has the advantages that satellite signals of two constellations of GPS and BDS (Beidou navigation satellite system) are combined, more visible satellites are provided for navigation solution, and compared with a single-mode DPE receiver, the positioning performance under the environments of serious signal attenuation, multipath and non-line-of-sight transmission and the like is improved.

The invention discloses a Beidou-based unmanned aerial vehicle global course flight automatic control system and method, and belongs to the technical field of unmanned aerial vehicle flight control. The airborne end equipment integrates a main control processing unit, a Beidou RNSS positioning module, a Beidou RDSS communication module and a flight control protocol conversion middleware, and is responsible for acquiring the position and attitude information of the unmanned aerial vehicle in real time, packaging the information into a state monitoring message and returning the state monitoring message; and the ground monitoring platform receives the analysis message and displays the state of the unmanned aerial vehicle in real time. The core lies in that a track deviation model and a pure tracking control algorithm are built in the ground monitoring platform, the three-dimensional deviation between the unmanned aerial vehicle and a preset route is solved in real time through a mathematical method, and a control instruction is automatically generated and packaged into a Beidou control message to be issued; the airborne end device issues instructions such as return flight and course correction to the unmanned aerial vehicle flight control through the protocol conversion middleware, and a remote control closed loop is formed. According to the invention, geographical restrictions of traditional ADS-B and 5G technologies are overcome by using the Beidou short message, and reliable technical guarantee can be provided for global safe flight of the low-altitude unmanned aerial vehicle.

The application discloses a petrochemical field precise space-time information processing and service system based on Beidou. The application is based on a petrochemical Beidou ground enhancement network of the Beidou navigation satellite system, relies on a petrochemical special network to collect satellite observation data, deploys a set of precise space-time information processing and service system of China Petrochemical in a petrochemical intelligent cloud, and provides independent controllable real-time centimeter-level positioning navigation and geographic information collection services in a plurality of high-precision positioning and navigation work scene applications such as long-distance pipeline inspection, dangerous chemical vehicle monitoring, industrial control system time service, oil and gas pipeline safety monitoring, geographic information data collection and geological disaster prevention monitoring.

The present invention provides a low-profile, wide-axial-ratio dual-sensor, dual-frequency circularly polarized antenna, comprising a first dielectric plate, a second dielectric plate, a circular metal patch, a rectangular metal patch, a metal floor, and a coaxial line. The second dielectric plate is disposed above the first dielectric plate. The circular metal patch is printed on the upper surface of the second dielectric plate, the rectangular metal patch is printed on the upper surface of the first dielectric plate, and the metal floor is printed on the lower surface of the first dielectric plate. The coaxial line is introduced from below the first dielectric plate, the outer conductor of the coaxial line is electrically connected to the metal floor, and the inner conductor of the coaxial line passes through the first and second dielectric plates in sequence and is electrically connected to the rectangular and circular metal patches. The present invention has the characteristics of dual frequency, dual circular polarization, and a wide-axial-ratio beam, and can better meet the requirements of the Beidou navigation satellite system. The present invention also has the advantages of simple structure, low profile, and small size, making it easy to manufacture and facilitating the promotion and use of related technologies.

This invention relates to the field of grounding wire management technology and discloses a monitoring and management system for intelligent grounding wires based on the BeiDou Navigation Satellite System. The system includes installing a wireless sensor on the top of a grounding operation rod to construct a set of grounding wire status parameters; using a decimeter-level single-frequency RTK matrix to construct a set of grounding wire positioning parameters; preprocessing the data; and then numbering and storing the preprocessed grounding wire status parameter set and grounding wire positioning parameter set. The system calculates status consistency, positioning matching, temporal correlation, and lifecycle; verifies the operation process and data validity based on the calculation results; and issues early warning signals based on the verification results. This system achieves intelligent monitoring, programmed control, and information-based early warning throughout the entire grounding wire usage process, replacing traditional manual operation and verification, avoiding human negligence and non-standard operation problems, eliminating hidden dangers such as missed removal, missed installation, and incorrect sequence, and ensuring personal and equipment safety.

This invention belongs to the field of electromagnetic interference detection technology for the BeiDou Navigation Satellite System, and discloses a method, system, device, and medium for identifying BeiDou multi-domain characteristic interference signals. This invention constructs a two-stage step-by-step identification strategy combining time-frequency maps and fourth-order cumulant maps. In each stage, an interference signal identification model based on a lightweight multi-scale network is built. In the first stage, based on the time-frequency map and the interference signal identification model, highly distinguishable interference types are identified. For easily confused interference signals that cannot be identified in the first stage, the second stage, based on the fourth-order cumulant map and the interference signal identification model, improves the accuracy of identifying easily confused interference types, ultimately improving the overall identification accuracy for complex interference. Simultaneously, the introduction of the lightweight multi-scale network effectively solves the problems of insufficient key feature capture and high computational cost of multi-scale structures in existing neural network technologies.

The invention discloses a Beidou-based control system for driving an electromagnetic valve to open and close, which comprises a Beidou satellite communication module, a central control unit, a driving module and an electromagnetic valve body, and is characterized in that the Beidou satellite communication module is used for receiving signals of a plurality of Beidou satellites; the central control unit is used for receiving a Beidou signal and a preset control signal; the driving module generates opening and closing actions according to a control signal sent by the central control unit; the Beidou satellite communication module can detect the opening and closing time period, the longitude and latitude and the altitude of the electromagnetic valve body. According to the control system, the electromagnetic valve is not limited by ground network coverage, remote accurate control over the electromagnetic valve can be achieved in remote areas, mountainous areas and other areas, the electromagnetic valve is opened and closed under various environmental conditions, and sampling is more accurate; meanwhile, the electromagnetic valve is closed in the whole transportation process after sampling, so that the leakproofness of the sample is ensured, the oxidation pollution and interference of external oxidizing substances on the sample are prevented, and the authenticity of the sample is also ensured.

This invention discloses a method for predicting the maneuvering motions of hydrogen fuel cell-powered ships based on multi-source data fusion, relating to the field of intelligent ship navigation. The method collects geodetic coordinate system position and heading data from the BeiDou Navigation Satellite System and ship hull coordinate system acceleration data from the Inertial Measurement Unit (IMU). After differential and integral preprocessing, a neural network model is built. A fusion-type loss function is constructed based on the transformation relationship between the ship hull coordinate system and the geodetic coordinate system. The model is trained using a backpropagation algorithm and can also be extended to fuse data from multiple sensors such as GPS. This invention fully leverages the complementary advantages of multiple sensor sources, effectively compensating for the inherent deficiencies of single-sensor data, significantly improving the accuracy and robustness of ship maneuvering motion prediction, and providing reliable technical support for intelligent navigation decision-making and safety assurance of hydrogen fuel cell-powered ships.

This invention discloses a method and apparatus for satellite pseudorange bias correction based on elevation and azimuth angles. The specific method involves: estimating parameters for each non-geostationary satellite and each available frequency under the BeiDou Navigation Satellite System, with a node distance of 0.1°, and proposing a segmented SICB correction method. Based on the BeiDou satellite's annual cumulative day, the ED-SICB value at the i-th frequency between consecutive epochs is estimated. Assuming that for a single satellite, there are n sets of ED-SICBs at the i-th frequency between the required elevation angles ([Elek-0.03, Elek+0.03]) for all measurement days, their weighted average estimate is calculated. The calculations in the first two steps yield a series of ED-SICB estimates, rather than absolute SICB estimates, thus further calculating SICB estimates at different elevation angles. Under the condition that the sum of all SICBs is zero, a polynomial segment fitting algorithm is used to minimize the sum of the absolute values ​​of the residuals, eliminating pseudorange bias and significantly improving model accuracy.

This invention discloses an adaptive strategy for the OLSR protocol based on UAV location information, belonging to the field of computer network routing protocol technology. The OLSR protocol method includes: obtaining the position coordinates and velocity information of the UAV's own node through its built-in BeiDou Navigation Satellite System (BDS); calculating the predicted position at the next moment using the UAV's velocity information; calculating the cosine similarity between the actual and predicted positions; comparing the values ​​of the cosine similarity; defining a new HELLO message sending cycle using the UAV's own velocity; and modifying the data packet format fields of the HELLO message by adding cosine similarity, position information, and velocity information.

This invention discloses an emergency communication method and system based on the BeiDou Navigation Satellite System, comprising: an emergency information receiving module receiving emergency notification information sent from different channels through multiple interfaces, and adding a field indicating the information source to the received emergency notification information message; an emergency information processing module processing the emergency notification information received by the emergency information receiving module, determining the urgency level of the information based on the information source and information content, and sending the processed emergency notification information to the BeiDou Navigation Satellite System; the BeiDou Navigation Satellite System broadcasting the emergency notification information; and a terminal device receiving the emergency notification information sent by the BeiDou Navigation Satellite System and processing the received information according to the instructions in the information content. This invention effectively solves the problem in existing technologies where the lack of mobile communication signals in emergency situations prevents the timely acquisition of emergency notification information.

This invention discloses a method for reconstructing the three-dimensional curve and calculating the sag of transmission conductors based on BeiDou navigation satellite system. Specifically, it relates to the field of spatial measurement and state perception technology for transmission lines. This method addresses the problems in existing conductor sag measurements where the three-dimensional spatial form is easily simplified to a planar relationship, leading to insufficient representation of the true trajectory of the conductor in complex channels, difficulty in removing local mixed-in points, difficulty in stably restoring continuous curves, and deviation between the calculated sag and the actual clearance position. By acquiring the coordinates of BeiDou observation points and the coordinates of the two end anchor points, a span coordinate system is established to form spatial contour data. Local observation segments are divided and the conductor body point sequence of the target span is identified. Then, a set of retained observation points is constructed, the three-dimensional curve of the target conductor is reconstructed, and the vertical difference at each longitudinal position is calculated based on the connection of the anchor points to complete the sag calculation of the target span conductor.

Embodiments of the present disclosure provide a solution for BeiDou Navigation Satellite System (BDS) B2b signal assistance information transmission. In the solution, a target device(110) receives, from a server(120), assistance information of a BDS B2b signal. The server(120) manages positioning for the target device(110). The assistance information comprises at least one of: navigation precision information related to the BDS B2b signal, data bit assistance information related to the BDS B2b signal, almanac assistance information related to the BDS B2b signal, universal time coordinate information related to the BDS B2b signal, orbit correction information related to the BDS B2b signal, clock correction information related to the BDS B2b signal, or quality information associated with a state space representation (SSR), or an ionospheric model information for BDS B2b signal. In this way, the BDS B2b signal can be used for positioning of the target device(110).

This invention relates to the technical field of BeiDou positioning, and discloses a method and system for multi-mode collaborative high-precision BeiDou positioning in complex electromagnetic environments. The method includes: collecting multi-source positioning data using multi-source positioning devices and performing spatiotemporal alignment processing; extracting positioning quality features from the multi-source positioning devices and converting these features into weight information for the multi-source positioning devices; constructing observation information and state information of the target to be positioned; and combining the observation information with the state information using a weighted extended Kalman filter for reinforcement learning to obtain high-precision fused positioning coordinates of the target to be positioned. This invention dynamically senses the positioning quality of different positioning devices, adjusts the weight information, automatically adapts to different positioning environments, and constructs a unified observation framework to filter and calculate BeiDou positioning results, fusing various heterogeneous information to achieve high-precision positioning through multi-mode collaboration, thus compensating for the positioning stability of the BeiDou navigation satellite system in complex electromagnetic environments.

The present invention provides a method and system for locating blastholes and determining real-time drilling depth based on a drill frame. The method comprises: using the Beidou navigation satellite system to obtain the three-dimensional coordinates of the pile head and the middle of the drill frame, so as to determine the coordinates of the blasthole mouth and the drill frame angle; analyzing the drilling process of the drill rig, determining each sub-process of the drilling of the drill rig, so as to determine the real-time drill rod length; calculating and feeding back the current drilling depth according to the coordinates of the blasthole mouth, the drill frame angle and the real-time drill rod length; storing and outputting the coordinates of the blasthole mouth and the current drilling depth; adopting the above scheme, during the drilling process of the drill rig, the three-dimensional coordinates of the blasthole mouth are obtained in real time by using a satellite positioning device installed on the drill frame, and the real-time drilling depth is obtained in combination with the effective drilling process of the drill rod, which provides a basis for the design and optimization of blasting parameters and will be widely used in intelligent and digital mines in the future.

The application provides a railway station yard positioning system and method based on Beidou positioning, and relates to the technical field of railway station yard positioning, and comprises at least one base station receiver, a mobile receiver and a correction receiver; wherein the base station receiver is arranged at a preset control point, and the mobile receiver and the correction receiver are arranged on a positioned target object; the base station receiver is used for receiving a first carrier phase of a Beidou navigation satellite system and sending the first carrier phase to the correction receiver; the mobile receiver is used for receiving a second carrier phase of the Beidou navigation satellite system and sending the second carrier phase to the correction receiver; and the correction receiver is used for generating differential correction information based on the first carrier phase and correcting the second carrier phase based on the differential correction information to obtain target position information of the positioned target object. The application improves the stability and accuracy of positioning in a complex scene of a railway station yard.

The application relates to a fire spread prediction and emergency early warning method and system based on on-board calculation, and belongs to the technical field of remote sensing satellites. Fire point recognition, environment parameter extraction, lightweight dynamic spread simulation, multi-frame fire line space-time sequence compression coding are completed on board, and short messages of the Beidou navigation satellite system are used to instantaneously send the compressed codes to a ground terminal, so that an emergency closed loop of ''on-board shooting, on-board calculation, on-board prediction of future situation and on-board sending'' is realized. Therefore, the problems that in the prior art, forest fire spread prediction relies on ground station processing, time efficiency is poor, and in remote areas, communication links are lacked and early warning information cannot be received are solved.

The invention relates to the technical field of Beidou positioning, and discloses a multi-mode cooperative Beidou high-precision positioning method and system in a complex electromagnetic environment, and the method comprises the steps: collecting multi-source positioning data through a multi-source positioning device, and carrying out the time-space alignment processing; performing positioning quality feature extraction on the multi-source positioning equipment, and converting positioning quality features into weight information of the multi-source positioning equipment; and constructing observation information and state information of the to-be-positioned target, and performing weighted extended Kalman filtering processing of reinforcement learning on the state information in combination with the observation information to obtain a high-precision fusion positioning coordinate of the to-be-positioned target. According to the invention, by dynamically sensing the positioning quality of different positioning devices, adjusting weight information, automatically adapting to different positioning environments, constructing a unified observation framework to carry out filtering calculation on Beidou positioning results and fusing various heterogeneous information, multi-mode collaborative high-precision positioning is realized; and the positioning stability of the Beidou navigation satellite system in a complex electromagnetic environment is compensated.

The invention provides a railway yard positioning system and method based on Beidou positioning, and relates to the technical field of railway yard positioning, and the system comprises at least one base station receiver, a mobile receiver and a correction receiver. Wherein the base station receiver is arranged at a preset control point, and the mobile receiver and the correction receiver are arranged on a positioned target object; the base station receiver is used for receiving a first carrier phase of the Beidou navigation satellite system and sending the first carrier phase to the correction receiver; the mobile receiver is used for receiving a second carrier phase of the Beidou navigation satellite system and sending the second carrier phase to the correction receiver; and the correction receiver is used for generating differential correction information based on the first carrier phase and correcting the second carrier phase based on the differential correction information to obtain target position information of the positioned target object. According to the invention, the stability and accuracy of positioning in a complex scene of a railway yard are improved.