8results about How to "Accurate time" patented technology

The invention relates to the technical field of satellite communication, and discloses a logistics transportation position monitoring method and system assisted by satellite communication. The method comprises the following steps: calculating a satellite-ground distance and a line-of-sight unit vector according to a satellite position coordinate and a terminal estimation position coordinate, and generating a baseband signal based on a three-axis speed component and the line-of-sight unit vector; calculating a target peak value based on the baseband signal, and when the target peak value exceeds a noise threshold, extracting a pseudo-range measurement value and solving a three-dimensional space positioning solution with the satellite position coordinates; calculating a path constraint position from the three-dimensional space positioning solution to the optimal path section; and accumulating a reference mileage from a starting point to the optimal path section, calculating an accumulated driving mileage, converting the path constraint position, packaging the path constraint position and the accumulated driving mileage into a monitoring data packet, and reporting the monitoring data packet to a logistics monitoring platform. According to the invention, high-precision logistics position monitoring in a mobile scene is realized, and the monitoring precision and scheduling efficiency of logistics transportation are effectively improved.

The application relates to the technical field of image acquisition, and discloses a multi-camera time synchronization method and device, computer equipment and a storage medium, the method comprising the following steps: acquiring a first image and a second image, the first image being obtained by a first camera performing image acquisition on a target screen, the second image being obtained by a second camera performing image acquisition on the target screen, the target screen being used for sequentially displaying different events, the target screen comprising a first region and a second region, and the gray scale of the image displayed by the first region being different from that of the image displayed by the second region in adjacent events; determining to-be-recognized regions corresponding to the first region and the second region in the first image and the second image; calculating a clock offset of the first camera and the second camera according to the gray scale values of the to-be-recognized regions; and debugging the first camera and / or the second camera according to the clock offset, so that the shooting time of the first camera and the second camera is synchronized. According to the application, the cost of multi-camera time synchronization is reduced.

The application relates to the technical field of data processing, and discloses a forestry carbon sink satellite remote sensing data correction method. The method is based on a satellite transit time window to implement multi-source time synchronization collection on satellite-borne, airborne and ground measured data, combines micro-meteorological data, digital elevation model data and crown laser radar data to simulate carbon sinks at different elevations at a single time point, and completes simulation correction through remote sensing radiation transmission coupling and eddy correlation data assimilation; further, according to the deviation of measured values and simulated values at different elevations, elevation-specific correction parameters are calculated, a three-dimensional correction parameter field of space-time-elevation is constructed and is adaptively updated; and finally, the correction parameters are used to uniformly correct, weightedly fuse and optimize residuals of satellite-borne data and airborne data. The application can improve the correction accuracy, spatial adaptability and processing efficiency of multi-source forestry carbon sink detection data under complex terrain conditions.

The utility model belongs to the technical field of motorcycle engines, and relates to a gear shifting structure of a motorcycle engine, which comprises a gearbox body, a driving shaft in transmission connection with a crankshaft and an output shaft in transmission connection with a load are arranged in the gearbox body, and the driving shaft is in transmission connection with the output shaft through a gear shifting mechanism. The gear shifting mechanism comprises a gear set and a shifting fork changing the connecting state of the gear set, a stepping motor is arranged on the outer side of the gearbox body, a crank is arranged on a motor shaft of the stepping motor in a sleeved mode, the crank is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to the shifting fork, and the shifting fork is arranged on a guide rod in a sliding mode. The guide rod is parallel to the driving shaft and the output shaft, and the stepping motor drives the shifting fork to slide in the axial direction of the guide rod so as to complete the gear shifting action. According to the gear shifting structure of the motorcycle engine, automatic gear shifting of a motorcycle can be achieved.

This invention belongs to the field of vehicle scheduling and provides a method and system for battery swapping scheduling of unmanned mining trucks. The method includes: retrieving mine map information and equipment status information to obtain map resource data and equipment status data; performing a hash pre-caching query on the coordinates of the task to be scheduled based on the equipment status data to obtain cached path results; performing dynamic collision detection on the cached path results based on the map resource data to obtain valid path data; making a closed-loop decision on battery swapping demand based on the valid path data to obtain a battery swapping scheduling instruction; and scheduling the mining truck to be scheduled based on the battery swapping scheduling instruction. This invention significantly shortens the path calculation response time, dynamically adapts to changes in the mine environment, and ensures that the battery swapping scheduling decision is synchronized with the on-site execution status in real time.

A gas metering valve for gaseous fuel, having a housing (1) in which an inlet opening (7) and an outlet opening (8) for gaseous fuel are configured. In the housing (1) a gas chamber (5) is configured and connects the inlet opening (7) with the outlet opening (8) in such a way that a gas flow from the inlet opening (7) to the outlet opening (8) can be realized. In the gas chamber (5) an electrically operable shut-off valve (10) is arranged in order to interrupt the gas flow in the gas chamber (5), and between the shut-off valve (10) and the outlet opening (8) an electrically operable control valve (25) is arranged with which the gas flow between the shut-off valve (10) and the outlet opening (8) can be interrupted.

This invention discloses a method and system for detecting and evaluating the settlement of buried pipelines based on ground-penetrating radar (GPR). The detection method acquires B-Scan mask images of shallow-buried pipelines, extracts the overall and local characteristics of target hyperbolic reflection signal feature points in the images, removes singular points, performs curve fitting on all valid target hyperbolic reflection signal feature points, and calculates and scores the depth and wave velocity values ​​corresponding to the target feature points to obtain the pipeline burial depth. The evaluation method, based on the pipeline settlement detection results, identifies the location of maximum settlement deformation by using the angle formed by the height change between two points on the pipeline, and predicts the location where the risk of fracture in the detected section may occur. The detection system implements this detection method, and the evaluation system implements this evaluation method. This application solves the problem in engineering measurements where hyperbolic reflection signals with characteristic damage caused by electromagnetic wave attenuation and coupling cannot be effectively calculated, significantly improving the data's processability and analyzability.

The utility model belongs to the technical field of kitchen appliances, and discloses a small-size food processor which comprises a cup body, a shell matched with the cup body in a sealing mode, a motor arranged in the shell and located below the cup body and a handle located on the side portion of the cup body, a smashing device is arranged in the cup body, and a rotating shaft of the motor penetrates through the bottom wall of the cup body to be in transmission connection with the smashing device. The shell is provided with an air inlet and an air outlet which are located below the cup body, a first fan for pumping outside air into the shell is arranged at the air inlet, a second fan for pumping the air in the shell to the outside is arranged at the air outlet, and the first fan and the second fan are arranged towards the cup body. The first fan and the second fan jointly provide power for circulation of airflow, the heat dissipation efficiency of the cup body is improved, cooling of the cup body and slurry in the cup is accelerated, the waiting time needed by drinking of a user is shortened, and the use experience of the user is improved.