Patent ID: 7640268
Filing Date: 2009-12-29
Classification: G01C,G01S,G08G,Y10S

Abstract:
1. A positional information management system comprising: a mobile terminal which receives gps (global positioning system) signals, measures acceleration, acquires acceleration data at a predetermined position and stores the acceleration data according to a communication state which is determined by the mobile terminal, and which derives a variable time cycle for notification as a function of the acceleration measured, the variable time cycle for notification becoming shorter as average velocity increases, and sends the notification in accordance with the variable time cycle when the variable time cycle is less than an elapsed time from a previous notification; a management server which is connected to said mobile terminal through a network and predicts a travel route of said mobile terminal based on information associated with traveling of the mobile terminal; and a communication system which specifies a current position of said mobile terminal and sends positional data representing the specified current position of the mobile terminal to said management server, wherein said management server: comprises a computer processing unit and memory, and is connected to a positional data storage unit which stores positional data representing that said mobile terminal is at a predetermined position, which is sent from said communication system in association with a reception time at which the positional data is received, and to an acceleration data storage unit which stores an acceleration log representing acceleration data in time series, which is stored by the mobile terminal and sent from said mobile terminal in association with a reception time at which the acceleration log is received, the management server being configured to: select positional data for two positions which are recorded adjacently time-wise in said positional data storage unit, and which are included in a travel route of the mobile terminal which is a target of prediction and which corresponds to identification information of the mobile terminal stored in connection with the positional data; determine whether or not positions represented by the selected positional data are positions of a notification point where a current position of said mobile terminal is to be notified; and extract an acceleration log whose reception time corresponds to a reception time of any of the selected positional data and predicts a travel route of said mobile terminal by specifying an intermediate position between notification points by the positional data which is notified to the management server based on a distance traveled from a start time at which the mobile terminal started to store the acceleration data represented by the acceleration log, which is derived from the extracted acceleration log and the selected positional data in a case where the positions represented by the selected positional data are determined not to be the position of the notification point, said mobile terminal being configured to: acquire the acceleration log, and store the acceleration log, in a case where the gps signals cannot be acquired at said mobile terminal; and send data regarding the position data of said mobile terminal and the acceleration log to said management server, in a case where gps signals are receivable and communication to said management server through the network becomes possible.