Location measurments using a mesh of wireless tags

A method for determining a location of a user device, the method comprising:

• receiving by the user device a map of relative positions of a group of wireless tags;
• wherein the user device differs from the wireless tags of the group;
• wherein each one of the wireless tags of the group is not physically connected to the user device;
• wherein the user device is carried by the user;
• and
• estimating, by the user device, the location of the user device based upon the map and an exchange of signals between some tags of the group and the user device;
• and
• wherein the map is calculated by exchanging signals between the tags of the wireless group.

A device for determining a location of a group of wireless tags, the device comprising:

• an interface for receiving:
• first information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• wherein the group of wireless tags includes, when receiving the first information, only tags without pre-known location;
• first movement information indicative of a first movement of a certain tag of the group of wireless tag in relation to other wireless tags of the group;
• wherein the certain tag is attached to the user or to the device;
• and
• second information, received after the first movement, indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• and
• a processor that is arranged to determine locations of the wireless tags of the group in response to the first information, second information and the first movement information;
• wherein the device is a user device carried by a user.

A non-transitory computer readable medium that stores instructions that when executed by a computer cause the computer to execute the stages of:

• receiving first information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• wherein the certain tag is attached to a user or to a user device carried by the user;
• wherein the group of wireless tags includes, when receiving the first information, only tags without pre-known location;
• tracking a first movement of a certain tag of the group of wireless tag in relation to other wireless tags of the group to provide first movement information;
• receiving, after the performing of the first movement, second information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• and
• determining, by the user device, locations of the wireless tags of the group in response to the first information, second information and the first movement information.

A non-transitory computer readable medium that stores instructions that when executed by a computer cause the computer to execute the stages of:

• receiving first information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• wherein the certain tag is attached to a user or to a user device carried by the user;
• instructing the user to preform a first movement;
• tracking the first movement of the certain tag in relation to other wireless tags of the group to provide first movement information;
• receiving, after the performing of the first movement, second information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• instructing the user to preform a second movement at a direction that is oriented to a direction of the first movement;
• tracking the second movement of the certain tag of the group of wireless tag in relation to other wireless tags of the group to provide second movement information;
• receiving, after the performing of the second movement, third information indicative of distances between each wireless tag of the group and between at least three other wireless tags of the group;
• determining locations of the wireless tags of the group in response to the first information, second information, third information, the first movement information and the second movement information.