12 results about "Orbit correction" patented technology

The invention relates to an unmanned aerial vehicle high-precision positioning method based on micro-centimeter space low-orbit constellation and Beidou PPP-B2b fusion enhancement, and the method comprises the steps: obtaining a precise orbit correction number and a precise clock correction number of a GPS and a BDS system based on a Beidou PPP-B2b signal; calculating a precise orbit and a precise clock error of the GNSS satellite based on the precise orbit correction and the precise clock error correction; on the basis of the precise orbit and the precise clock error of the GNSS satellite, an observation value of a micro-centispace low-orbit satellite is fused, and a GNSS / LEO combined PPP observation model is constructed; and based on extended Kalman filtering, precise point positioning calculation is carried out on the GNSS / LEO combined PPP observation model, and the real-time high-precision position of the unmanned aerial vehicle is obtained. According to the invention, the real-time high-precision position of the unmanned aerial vehicle can be rapidly and stably obtained, and a reliable position reference is provided for autonomous operation of the unmanned aerial vehicle in a network-free environment.

The invention discloses a satellite-borne microwave radar tracking wave beam on-orbit correction method, which comprises the following steps: an on-orbit calibration step: acquiring high-precision relative angle information through GNSS differential positioning by using two cooperative satellites equipped with GNSS receivers, and making a difference between the high-precision relative angle information and a tracking measurement angle of a satellite-borne microwave radar to a target satellite, obtaining a pointing deviation of a radar tracking beam; and an on-orbit correction step: injecting the pointing deviation into the spaceborne microwave radar in a ground injection mode, and adjusting a radar tracking algorithm to compensate the pointing deviation so as to realize on-orbit correction of tracking beam pointing. According to the invention, the problem of deterioration of radar product tracking precision caused by inconsistency of the on-orbit state and the ground state can be effectively solved, and the anti-risk capability of the load system function is improved.

This invention discloses a high-precision periodic orbit maintenance method based on maintenance point rolling optimization, relating to the field of spacecraft orbit control and orbit maintenance technology. Based on a high-precision ephemeris dynamics model, it constructs a maintenance point rolling prediction mechanism, a navigation and execution error model, and a least-squares orbit correction strategy under multi-path point constraints. This application uses the above method to achieve high-precision, low-energy-consumption, and highly robust long-term maintenance of a spacecraft's periodic orbit in a realistic multi-body perturbation environment.

The invention discloses an indoor positioning method, device, equipment, medium and product, and the method comprises the steps: packaging an RTCM message sent by a CORS base station platform into a positioning system information block through an LMF network element, and transmitting the positioning system information block to an indoor distribution system, thereby enabling a terminal to carry out the positioning through the positioning system information block broadcasted by the indoor distribution system, and enabling the positioning efficiency to be improved. Wherein the RTCM telegraph text comprises satellite ephemeris, orbit correction, clock correction and RTK differential data, so that the terminal can perform high-precision indoor positioning by combining the satellite ephemeris, the orbit correction, the clock correction and the RTK differential data, and the indoor positioning precision is improved.

The application discloses a kind of satellite clock orbit correction product integrity information coding precision and update cycle determination method and device, belong to satellite navigation technical field.The method receives the real-time observation data of integrity monitoring station network and satellite clock orbit correction product integrity information by PPP-RTK cloud master station, constructs protection level prediction model based on the required navigation performance of user, and the sensitivity analysis is carried out to the protection level change caused by integrity information change, determines coding precision and average failure duration.Combining average failure duration constructs update cycle determination model, finally forms the coding and broadcast scheme of satellite clock orbit correction product integrity information.The application significantly improves the reliability of broadcast data and the integrity of PPP-RTK real-time positioning, and provides important support for intelligent, unmanned application of high-precision, high-integrity space-time information demand.

This utility model discloses a satellite constellation orbit correction device based on inter-satellite links, belonging to the field of aerospace technology. It includes a ground station body, with a receiver mounted on the top of the ground station body. Four supports are fixedly mounted on the bottom of the receiver, and the outer side of each support is provided with an insulating layer. This inter-satellite link-based satellite constellation orbit correction device controls an electric push rod to move a lifting plate. Through the limiting of a sliding groove, a slider assists the lifting plate in moving up and down within a receiving slot. At this time, the shielding mesh can be pulled up to achieve isolation and protection from the outside world. A discharge tube can reduce lightning damage to the equipment during thunderstorms. An antenna cover can effectively prevent rainwater from corroding the antenna elements. A filter can enhance signal transmission, enabling the antenna elements to stably send detection signals to the satellite constellation. Finally, through the receiver and external computing equipment, the satellite constellation orbit can be corrected.

The application discloses a positioning method and system based on Beidou PPP-B2b, and comprises the following steps: acquiring PPP-B2b orbit correction numbers broadcast by Beidou No.3 system geosynchronous orbit satellites; establishing a first full-network state space error estimation model of corresponding estimated parameters of satellite clock errors of multiple satellites, multiple satellites and multiple reference station servers according to the PPP-B2b orbit correction numbers; introducing reference constraints to the first full-network state space error estimation model, and redefining parameters to solve the satellite clock errors and the corresponding estimated parameters, so that positioning is performed according to the solved satellite clock errors. The application can quickly solve the satellite clock errors, improve the precision and reliability of the satellite clock errors, and realize wide-area real-time precise positioning.

This application relates to a method for sea ice classification and concentration inversion using UAV optical and thermal infrared data. The method includes: first, obtaining registered UAV optical and thermal infrared images through preprocessing techniques such as orbit correction, radiometric calibration, and geometric correction, providing high-quality data for subsequent sea ice information extraction; second, constructing an Ice-Unet deep learning model to obtain high-precision sea ice classification results; third, selecting surface temperature values ​​corresponding to open water and fixed ice in the sea ice classification to construct coordinate point values ​​for the thermal infrared data, and constructing a linear inversion model based on a radiative transfer model to obtain sea ice concentration inversion results based on thermal infrared data. This solves the problems of existing technologies in achieving rapid reporting and on-site support of sea ice information in Arctic waters.

The application discloses a precise positioning product test system and method, which comprises a communication unit, a clock synchronization unit, a real satellite orbit parameter calculation unit, a navigation signal simulation generation unit and an SSR data generation unit. The application improves the accuracy of the broadcast satellite orbit and clock difference of the simulated generated navigation radio frequency signal. On the other hand, the application synchronously processes the input real SSR data information to generate the output SSR simulation signal, thereby improving the accuracy of the orbit correction number and the satellite clock difference correction number in the simulated generated SSR data. Meanwhile, the application receives the NTP time service to generate the clock signal which is distributed to the navigation signal simulation generation unit and the SSR data generation unit, and cooperates with the synchronous simulation control parameters output by the navigation signal simulation unit, so that the simulation time is synchronized with the real scene, and finally the precise positioning product test result is consistent with the real performance.

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 application discloses a method and system for dynamic monitoring of resource utilization in open-pit mines, relating to the field of mining monitoring technology. The method involves: performing precise orbit correction and registration on time-series SAR image data; extracting an initial annual digital elevation model (DEM) based on the registered SAR image data; compensating for incoherent areas to obtain a target annual DEM; converting the target annual DEM into a three-dimensional surface model of the open-pit image; determining the three-dimensional orebody model of the utilized orebody portion based on the three-dimensional orebody model and the three-dimensional surface model of the open-pit image; calculating resource utilization based on the three-dimensional orebody model; calculating the extracted volume using an earthwork quota method and using it as the orebody quota earthwork volume; confirming the reliability of resource utilization based on the orebody quota earthwork volume and the total volume of the three-dimensional orebody model, thus completing the dynamic monitoring of resource utilization. This application improves the accuracy and efficiency of dynamic monitoring of resource utilization in open-pit mines.

The application aims to provide a reinforcement learning-based strong generalization capability accelerator orbit correction method and system, which comprises the following steps: establishing a simulation accelerator according to the data of a real accelerator; measuring BPM values in the simulation accelerator and constructing a feature matrix according to the BPM values; inputting the feature matrix into a reinforcement learning model, and outputting a current change value from the reinforcement learning model; and correcting the current value of the real accelerator according to the current change value and the magnet current value in the real accelerator. The application can greatly save online debugging time and cost and improve the beam debugging efficiency.