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1. (WO2009122000) POSITIONING OF MOBILE OBJECTS BASED ON MUTUALLY TRANSMITTED SIGNALS

Pub. No.:    WO/2009/122000    International Application No.:    PCT/FI2008/050159
Publication Date: Oct 8, 2009 International Filing Date: Apr 2, 2008
IPC: G01S 5/00
G01S 5/02
G01S 5/16
G01S 5/18
Applicants: EKAHAU OY
MISIKANGAS, Pauli
VASKO, Kari
KOUTANIEMI, Arsi
Inventors: MISIKANGAS, Pauli
VASKO, Kari
KOUTANIEMI, Arsi
Title: POSITIONING OF MOBILE OBJECTS BASED ON MUTUALLY TRANSMITTED SIGNALS
Abstract:
Location estimation for first target object (TO1) assisted by second target object (TO2), which have co-located signalling devices (STR1, STR2). A positioning engine (PE) employs a data model (DM) of a location-dependent physical quantity and determines location probability distributions for the target objects. One signalling device (STR2) sends positioning-assisting signals to the other (STR1 ) which makes observations from it. The positioning engine (PE) uses observations on the physical quantity and the positioning-assisting signals to make a quantity observation set, and determines location probability distributions (LPD1, LPD2) for the target objects. The positioning engine (PE) determines an updated first location probability distribution (LPD1') based on the location probability distributions and the positioning-assisting observation set. The positioning engine determines the location estimate for the first target object based on the updated first location probability distribution and triggers a physical action based on the location estimate for the first target object.