3 results about "Temporal search" patented technology

This invention belongs to the field of data processing technology and provides a method and application for automatic time alignment of radar and image data based on target association. The method includes: creating a time search window on the time axis of the image data stream for each frame of radar data in the radar data stream; projecting each radar target in the radar dynamic target list onto the image coordinate system; for each frame of image within the time search window, counting the number of projection points falling into the image detection box to generate a target association score; selecting the radar frame and image frame with the highest target association score as a synchronization frame pair; calculating the timestamp offset based on the timestamp of the synchronization frame pair; and selecting a corresponding time alignment strategy to automatically align the radar data stream and image data stream based on the statistical stability of the calculated timestamp offsets. This invention can solve the problem of timestamp asynchrony between independently recorded millimeter-wave radar point cloud data and camera image data; and can achieve automatic offline time alignment.

This application relates to an adaptive rapid positioning method and system based on GNSS synchronization status, belonging to the field of navigation and positioning technology. The method includes: entering the normal positioning process when all tracked satellite signals have completed message time synchronization; otherwise, entering the adaptive time-free positioning process, which includes first dynamically determining the minimum reliable time unit and time search interval based on the synchronization status level of the tracked satellite signals; then determining a relatively accurate local reference time as the local baseline time based on the synchronization status level and time search interval; and after correcting the signal transmission time of the tracked satellites based on the local baseline time and the minimum reliable time unit, performing rapid AGPS iterative calculation. This method enables rapid receiver positioning under a wide range of time errors.

The present disclosure relates to the technical field of password system security evaluation, and proposes an improved evaluation method and system of information set decoding algorithm, which first acquires SDP problem parameters and optimization parameters of the algorithm to be evaluated, estimates search space and expected iteration times by using combination number formula; calculates time overhead of Gaussian elimination of check matrix H in each round; evaluates complexity of search tree construction according to the number of layers and the size of the search tree; then estimates expected times of finding correct error vectors by constructing a matching probability model and taking its reciprocal; and finally obtains overall time complexity of the information set decoding algorithm in solving the SDP problem under the current parameter configuration by comprehensively processing complexity, Gaussian elimination time, search tree construction complexity and matching expected times. Through fine modeling and probability backstepping mechanism, more accurate complexity analysis means are provided, which can be widely applied to key links such as parameter selection, security level verification and standard formulation of post-quantum encryption algorithm.