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As an important area of spatio-temporal data mining, time relaxed gradual clustering pattern has been attracting broad attention in recent years. Algorithm PTRGSP is proposed to mining time relaxed gradual clustering pattern from spatio-temporal trajectory, which is implemented under spark framework. All trajectories are divided into point sets with different timestamps, and such point sets are parallel...
As advanced intelligent transportation systems become more prevalent with the use of cyber-physical systems, information and communications technologies, and Big Data, there is an increasing need to improve the process of technology evaluation. Existing procedures typically involve pure computer simulations followed by expensive and restricted field studies. We propose a more integrated solution:...
A fine alignment method suitable for marine strapdown inertial navigation system is proposed. In this method, DVL (Doppler velocity log) is applied to give velocity reference. System error equation is deduced to obtain fine alignment model. And the measurement equation corresponded to Doppler velocity log is given in this paper. Here in the measurement equation we consider the DVL speed measuring...
When the vessels are sailing for a long time, because of the changes in environmental and other factors, which will cause gyro drift, scale factor and installation errors, gyro online calibration is required. This paper uses high precision attitude information which is provided by CNS, installs gyro online calibration models based on quaternion error, a method of on-line calibration for SINS/CNS based...
This paper describes the definition of vessel heave motion and designs a scheme of using inertial techniques to measure the vessel heave motion. The move frame is established to describe the heave motion and the coordinate transition matrix from body frame to move frame is given in this paper. High-pass filter is used to eliminate heave motion errors due to the Schuler oscillation and the divergence...
The initial alignment accuracy of strapdown inertial navigation system (SINS) is limited by the gyro drift and accelerometer bias, and the integrated alignment is generally used to diminish the error of initial alignment. In this paper, a reasonable dual-axis rotation scheme is designed to improve the observability degree of rotary strapdown inertial navigation system, and a novel integrated alignment...
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