Patent ID: 8355888
Filing Date: 2013-01-15
Classification: G01C

Abstract:
1. A system useful for determining a momentary positions in a pedestrian navigation, said system comprising a sensor arrangement, said sensor arrangement comprising: a control unit, a first on-foot pedestrian navigation module and a second on-foot pedestrian navigation module; each of the modules including: a)—a module controller, b)—a communication unit for enabling said control unit to send and receive data to and from said module, and c) at least a first sensor unit and a second sensor unit; each sensor unit including: (i) an up/down sensor adapted for sensing a state condition being an ‘up’ condition or a ‘down’ condition, wherein said state conditions associated with relative displacement of the module with respect to a surface; (ii) a signal transmitter/receiver adapted for generating a propagating signal in response to an activation signal generated by said module controller; said control unit is adapted for continuously: 1) receiving from said modules first data indicative of said state conditions; 2) determining a pedestrian motion model out of plurality of motion models based on at least said first data; 3) based on the so determined pedestrian motion model, selectively sending control signals to either or both of the communication units in said modules thereby triggering generation of activation signals and in response triggering the transmitter/receivers in said modules to generate propagation signals; 4) receiving from communication unit of at least one of said modules second data associated with receipt of said propagating signal by at least two other of the signal transmitter/receivers; and 5) using said second data to determine a momentary position of one or more of the modules.