43 results about "Trajectory pattern" patented technology

A training projectile that utilizes flutes or flats to augment roll damping characteristics and thereby cause the projectile to crossover into a gyroscopically unstable trajectory pattern at a predetermined time. Prior to the crossover, the training projectile maintains a gyroscopically stable trajectory, which enables extrapolation to ascertain the trajectory of a non-training projectile that does not have an augmented roll damping section. The unstable trajectory pattern substantially reduces the distance the training projectile can traverse, thereby reducing the amount of area required for a training range.

The invention discloses a road network trajectory clustering analysis method based on an improved DPC algorithm, and belongs to the field of clustering analysis methods, and the method comprises the steps: S1, carrying out the effective collection of a road moving object trajectory; s2, expressing trajectory data; s3, calculating the distance between the sub-trajectories by adopting an aggregationdistance CD, fusing the vertical distance, the parallel distance and the angle distance by the distance, and obtaining inter-trajectory similarity measurement on the basis of the CD distance; s4, according to the fused CD distance matrix, carrying out sub-track clustering by utilizing an improved DPC algorithm; and S5, for the obtained clustering result, extracting a classical trajectory of the clustering result as a new behavior mode of the whole road network. According to the method, the precision of road trajectory measurement is improved, compared with a traditional density clustering algorithm, the influence of self-defined parameters is reduced, the interactivity with a user is improved, and it is beneficial to discover meaningful trajectory modes in a road network.