Methods And System For Multi-path Mitigation In Tracking Objects Using Reduced Attenuation RF Technology

Abstract

A method and system for a long range Radio Frequency (RF)-based identification, tracking and locating of objects. The method and system use a narrow bandwidth ranging signal(s), including VHF of lower frequency bands, which minimizes propagation loss and loss of accuracy of the RF locating signals. The method and system includes narrow bandwidth ranging signal multi-path mitigations processor, which further improves the track-locate accuracy. The signal is sent from a Master Unit(s) to a Tag. The signal traveling time is recorded and the distance between the Master(s) and the Tag is calculated. The method and system allow achieving a longer distance of the RF narrow bandwidth ranging signal penetration and an increased accuracy by using VHF bands in conjunction with the narrow bandwidth ranging signal multi-path mitigations processor.; The techniques of Digital Signal Processing and Software-Defined Radio are used. The actual waveforms transmitted and received by the radios are defined by the software. The roles of the Master Unit(s) and the Tag can be reversed.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application No. 61 / 514,839, filed August 3, 2011, entitled "MULTI-PATHMITIGATION IN RANGEFINDING AND TRACKING OBJECTSUSING REDUCED ATTENUATION RF TECHNOLOGY," filed November 2, 2011, and entitled " MULTI-PATHMITIGATION IN RANGEFINDING AND TRACKING OBJECTSUSING REDUCED ATTENUATION RF TECHNOLOGY", U.S. Provisional Application No. 61 / 554,945, filed March 30, 2012, entitled "MULTI-PATHMITIGATION IN RANGEFINDING AND LOCKING OBJECTSUSING REDUCED ATTENUATION RF TECHNOLOGY" PROVISIONAL APPLICATION 61 / 618,472 AND THE BENEFITS OF U.S. PROVISIONAL APPLICATION 61 / 662,270, TITLE "MULTI-PATHMITIGATION IN RANGEFINDING AND TRACKING OBJECTSUSING REDUCED ATTENUATION RF TECHNOLOGY," FILED JUNE 20, 2012, THE ENTIRE TEXT OF THEREOF BY REFERENCE incorporated in this article. technical field [0003] The present embodiments relate to wireless communication and wireless networking systems and systems fo...

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Problems solved by technology

Also, in the case of active DAS, the best accuracy (error lower bound) is limited to 50 meters

Chen et al. cannot deal with the impact of multipath on positioning accuracy in indoor environments, where it is worst indoors (compared to outdoors) and in many cases causes much larger (2×-4×) than required positioning error

[0024] Modifications to indoor wireless network antenna systems as taught by Chen et al.

Furthermore, in the case of active DAS, the best theoretical accuracy is only 50 meters, while in practice this accuracy will be significantly lower due to RF propagation phenomena including multipath

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