Patent ID: 11968591
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method of maintenance of a location fingerprint database for an area, the method comprising:
collecting signal measurement data together with motion sensor data from each of a plurality of portable devices transiting a portion of the area of the location fingerprint database at a first period of time, wherein the motion sensor data comprises inertial sensor data and wherein the motion sensor data is collected by a sensor assembly in each of the plurality of portable devices;
using offline non-causal processing to process the collected motion sensor data into reference positions associated with the portion of the area at a subsequent period of time, wherein the non-causal processing provides an output at a certain instant of time that is a function of past, present and future inputs that are obtained from the motion sensor data at past, present and future points in time, as compared to the certain instant of time; and
employing the collected signal measurement data together with the reference positions using at least one of a plurality of processing techniques, in order to update the location fingerprint database.