Trajectory determining device

A trajectory determining device, comprising:

• a memory (4) for receiving signaling data associating communications mobile device identifiers, time markers and signaling identifiers, at least some of the signaling identifiers designating a localization cell,
• a classifier (6) capable, for a given communications mobile device identifier, of marking the signaling data associated with it with a movement marker indicating a state chosen from amongst a list comprising at least one movement and one short stop,
• an analyzer (8) capable of processing the signaling data marked according to the movement markers in order to produce trajectory data associating, on the one hand, a given communications mobile device identifier and, on the other, a series of movement markers each associated with a localization cell and with a time marker, such that two movement markers whose time markers indicate that they are consecutive denote distinct states, by applying at least one of the following rules:
• a) the modification of any given movement markers into movement markers indicating a short stop, when, for two movement markers indicating a short stop associated with a single localization cell, the number of movement markers whose time markers indicate that they are between these two movement markers is less than or equal to 4,
• b) the modification of movement markers indicating a movement into movement markers indicating a short stop when the time markers associated with them indicate that they are preceded and followed by movement markers indicating a short stop and when the time markers associated with the latter indicate a duration shorter than a first threshold,
• c) the modification of movement markers indicating a movement into movement markers indicating a short stop when the time markers associated with them indicate that they are preceded and followed by movement markers indicating a short stop which are associated with the same localization cell and when the time markers associated with the latter indicate a duration shorter than a second threshold,
• d) the modification of movement markers indicating a short stop into movement markers indicating a movement when the time markers associated with them indicate that they are preceded and followed by movement markers indicating a movement and when the time markers associated with the latter indicate a duration shorter than a third threshold,
• e) the merging of movement markers indicating a short stop whose time markers indicate that they are consecutive, and the association with the resulting movement marker of the localization cell associated with the movement markers whose time markers represent the longest duration and of a time marker corresponding to the sum of the durations of the associated time markers,
• an extractor (12) configured for determining, from amongst the trajectory data, pairs of movement markers associated with the same communications mobile device identifier the time markers of which and the associated localization cells of which define a duration exceeding a first threshold and a distance exceeding a second threshold, and, for a given pair of movement markers, for grouping into a candidate set the signaling data associated with the corresponding communications mobile device identifier and the time markers of which are included between the two time markers of the given pair of movement markers,
• a detector (14) configured for determining, within a given candidate set, whether signaling data associated with time markers meet one of the following conditions:
• I) the signaling data define a movement speed greater than a third threshold, and the corresponding time markers are separated by a time period greater than a fourth threshold,
• II) the time markers of the signaling data are separated by a time period greater than a fifth threshold greater than the fourth threshold, the associated signaling identifiers indicate an absence of activity, the signaling data define a movement speed greater than the speed defined by the division of the first threshold by the second threshold,
• the detector (14) being configured, when one of the conditions I) and II) is met, for returning classified movement data (16) associating data on movement type and departure and arrival data determined from the localization cells associated with the signaling data and from a group of chosen locations.