Patent ID: 7859411
Filing Date: 2010-12-28
Classification: G01S,G06Q

Abstract:
1. A system for predicting a trajectory of an item tagged with an RFID tag comprising: a network of communicatively coupled RFID readers, each having tag cache memory; and a search engine communicatively coupled with the tag caches in each of the readers; wherein, when the tag is within operating range of one of the readers, the tag is interrogated for its data and path information comprising timestamps of reader-tag interactions and related event data, and updated path information is stored in the tag cache memory; wherein the search engine, performs a search the tag cache memory in one of one of the readers to locate information corresponding to search criteria including characteristics of the tagged item sought; wherein, when the information corresponding to the search criteria is found, the path information is retrieved, and the trajectory of the item is extrapolated using a transit time of the item and average velocity of the item, determined from the timestamps and known distances between locations of each of the reader-tag interactions, along an expected path of the item.