Traffic jam sign detection method, program, and traffic jam sign detection device

摘要

A traffic jam sign executed by a traffic jam sign detection device (10) including a three-dimensional acceleration sensor (14) that acquires acceleration information in the X-axis, Y-axis, and Z-axis directions forming a three-dimensional space orthogonal coordinate system. An input data calculation step, which is a detection method, calculates an acceleration vector using acceleration information acquired by the three-dimensional acceleration sensor (14), and calculates a norm of a difference between vectors at two different timings as input data. And a frequency analysis step for calculating a power spectrum by calculating an autocorrelation of input data and performing a Fourier transform on the autocorrelation, an angle information obtaining step for converting the power spectrum into angle information, and depending on the angle information And a traffic jam sign detection step for detecting a traffic jam sign.