DEVICE, METHOD, AND PROGRAM FOR CALCULATING MOVEMENT CONDITIONS, AND RECORDING MEDIUM FOR THE PROGRAM

摘要

A vehicle speed sensor (171) detects the speed of a vehicle based on a specific speed information signal converted into a predetermined signal mode after being changed into digital information. A vehicle speed accuracy detection section (111A) determines the quality of how accurate the vehicle speed is reflected to the result of the vehicle speed detection by the vehicle speed sensor (171). When it is determined that the accuracy of vehicle speed reflection to the result of the vehicle speed detection is satisfactory, the result of the detection by the vehicle speed sensor (171) is used, without change, to calculate information on movement conditions. On the other hand, when the accuracy of the result of the vehicle speed detection by the vehicle speed sensor (171) is determined to be unsatisfactory, information different from the actual detection result by the vehicle speed sensor (171) is used to calculate information on movement conditions. As a result, information on movement conditions of a mobile body can be accurately obtained.