49 results about "Trajectory method" patented technology

Methods and arrangements for measuring similarity with respect to moving object trajectories. First and second moving object trajectories are input, each trajectory being defined by at least two spatial dimensions and a temporal dimension. At least one segment is defined with respect to each trajectory, each segment being defined between two defining points. At least one segment from the first trajectory is matched with at least one segment from the second trajectory. A spatial distance and temporal distance are each computed between the at least one segment from the first trajectory and the at least one segment from the second trajectory. The spatial distance and temporal distance are combined to provide a measure of a spatio-temporal distance between the at least one segment from the first trajectory and the at least one segment from the second trajectory. Other variants and embodiments are broadly contemplated herein.

A ballistic trajectory method for a golf ball is disclosed wherein a ballistic trajectory of a golf ball having a plurality of dimples formed on the surface thereof when the golf ball is hit to fly at an arbitrary number of rotations and an arbitrary initial speed can be estimated and ballistic trajectory and flight characteristics of the golf ball can be evaluated without depending upon experimental evaluation which is based on an actual model thereby to allow a golf ball to be developed efficiently. The ballistic trajectory of the golf ball when the golf ball is hit to fly is estimated by successively calculating the flight distance and the height of the ball after every lapse of a very short period of time after the ball is hit to fly until it drops to the ground making use of arithmetic operation by a computer.

Methods and arrangements for measuring similarity with respect to moving object trajectories. First and second moving object trajectories are input, each trajectory being defined by at least two spatial dimensions and a temporal dimension. At least one segment is defined with respect to each trajectory, each segment being defined between two defining points. At least one segment from the first trajectory is matched with at least one segment from the second trajectory. A spatial distance and temporal distance are each computed between the at least one segment from the first trajectory and the at least one segment from the second trajectory. The spatial distance and temporal distance are combined to provide a measure of a spatio-temporal distance between the at least one segment from the first trajectory and the at least one segment from the second trajectory. Other variants and embodiments are broadly contemplated herein.

Methods and apparatus of the present invention allow for interpolated Just in Time (iJIT) seek command control of hard drive actuators.

Methods and systems are provided for monitoring conformance of an aircraft to an actual and predicted 4-dimensional (4D) trajectory with respect to a reference business trajectory (RBT). First, a flight plan for the aircraft is acquired from an onboard flight management system (FMS) computer. A predicted flight trajectory is generated based on the latitude, longitude, altitude, speed and time of the flight plan for the aircraft. An onboard trajectory conformance monitor that is independent of the FMS computer, monitors the present flight trajectory of the aircraft and anticipates any actual or future deviations from the RBT. The trajectory conformance monitor will generate an advisory of any actual or anticipated deviations from the RBT.

The invention discloses a pollution tracing method and device. The method comprises the following steps: inputting air quality forecast data into an air mass trajectory tracing model, and calculating to obtain backward diffusion trajectories of a point location selected at a preset moment at different heights after a preset duration; extracting longitude and latitude data sets of all heights on the backward diffusion trajectory, and drawing trajectory lines according to all the heights and the corresponding longitude and latitude data sets; and according to the emission height and position information of each pollution source obtained by the pollution source emission list and / or the pollution source general survey, screening out the pollution source of which the distance from the drawn trajectory is smaller than a preset length, and obtaining the pollution source emission information around the trajectory. The device comprises a diffusion track calculation unit, a track line drawing unit and a pollution source screening unit. According to the method and the device, respective advantages of a backward trajectory method and a pollution source information method are combined, results are associated, pollution source tracing results are further finely and scientifically focused, and guidance and direction are provided for subsequent pollution prevention and control work.

The invention discloses a support vector regression machine fusion-based expressway road section mean velocity estimation method. The method includes the following steps that: 1) an expressway to be researched is selected, and basic data are obtained; 2) a road section mean velocity is obtained through using a trajectory method-based correction algorithm and according to fee charging data; 3) passenger service vehicles and hazardous article transport vehicles of which the single operating mileage exceeds 800 kilometers are adopted as floating vehicles, a road section mean velocity is obtained through using a speed-time integral model and a weighted average method; and 4) a support vector regression machine fusion algorithm is adopted to fuse the two road section mean velocities, so that a support vector regression machine fusion-based expressway road section mean velocity can be obtained. According to the support vector regression machine fusion-based expressway road section mean velocity estimation method of the invention, expressway road section fee charging data and Beidou satellite positioning system data about the passenger service vehicles and hazardous article transport vehicles of which the single operating mileage exceeds 800 kilometers are combined, the fused road section mean velocity is obtained through the support vector regression machine method, and therefore, the accuracy of velocity estimation is improved, the daily monitoring and emergency disposal of expressway managers can be benefitted, and the operational efficiency of expressways can be effectively improved.

The invention belongs to the technical field of space-to-ground observation, and particularly discloses a method for calculating a three-dimensional intersection angle of satellite images. The method comprises the following steps of A, acquiring image point coordinates of same-name points of a three-dimensional satellite image pair by using a manual measurement or automatic satellite image matching method; B, implementing an RFM (rational function model)-based area network compensation method by utilizing the coordinates of the same-name points of the satellite images to realize the optimization of RPC (rational polynomial coefficient) parameters; C, calculating spatial rectangular coordinates corresponding to object-space points formed by projecting the same-name points onto projection surfaces at different elevations by using a projection trajectory method to finish the spatial reconstruction of same-name light; and D, calculating the three-dimensional intersection angle of the same-name light by utilizing direction vectors of the reconstructed same-name light. The method is applied to the calculation of the three-dimensional intersection angle of any three-dimensional model formed by overlapped satellite images without any ground control point, can be used for the mapping accuracy evaluation of the three-dimensional model, and has remarkable economic and social benefits.

The present invention relates to a system and method for calculating the field operation area of ​​agricultural machinery in a dual algorithm mode, which includes a vehicle-mounted terminal device and a server module; the vehicle-mounted terminal device is provided with: a device for locating the position of the agricultural machine during operation GPS module, the GPRS module that sends the location data and the corresponding time of each location point to the server module through the wireless network and receives the calculation result of the server, and is used to control the GPS and GPRS module, control the display results, and control the storage and call of historical data The device; the GPS module, the GPRS module and the display are all connected to the controller, and the GPRS module communicates with the server through the GPRS wireless network; the server module is responsible for calculating related results. The present invention simultaneously uses two algorithms, the finite element method and the trajectory method, to calculate the actual land area of ​​the farmland operation area and the area that the agricultural machine itself travels in the operation area, and to provide the required operation according to the measured area. At the same time, the results of the driving trajectory are saved in the form of pictures, which is convenient for agricultural machinery drivers and farmers to understand the detailed driving conditions.

The invention discloses a method for depicting the relationship between horizontal well track and strata, comprising the following steps: (1) acquiring the position information of a horizontal well on an oil and gas reservoir structure to get a geological data body of an area where the horizontal well is located; (2) standardizing the well logging curve of vertical wells and pilot hole wells in the area where the horizontal well is located; (3) performing stratigraphic comparison to determine the top and bottom limits of a drilling target stratum of the horizontal well, and building a target stratum top and bottom structure model; (4) selecting a vertical well adjacent to the horizontal well, and conducting multi-well fine sand body comparison to form a sand body fence diagram; (5) building a 3D sand body model; (6) collecting sand body slices along the horizontal well track in the 3D sand body model to get an initial model of the relationship between horizontal well track and strata; and (7) correcting sand body slices around the horizontal well track to realize visual representation and fine depiction of the relationship between horizontal well track and strata. By using the method, fine depiction of the relationship between horizontal well track and strata is realized.