The Cramer–Rao Bounds of Hybrid TOA/RSS and TDOA/RSS Location Estimation Schemes

Abstract

In short range communications, the use of RSS measurements in conjunction with TOA or TDOA leads to enhanced estimation accuracy with respect to the case where only TOA or TDOA are used. In this article, we derive the Cramer-Rao Bound (CRB) for location estimation accuracy of two different hybrid schemes: TOA/RSS and TDOA/RSS. For short ranges, the hybrid schemes offer improved accuracy, particularly in the proximity of the reference devices.This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. TR2003-143Abstract-In short range communications, the use of RSS measurements in conjunction with TOA or TDOA leads to enhanced estimation accuracy with respect to the case where only TOA or TDOA are used. In this article, we derive the Cramer-Rao Bound (CRB) for location estimation accuracy of two different hybrid schemes: TOA/RSS and TDOA/RSS. For short ranges, the hybrid schemes offer improved accuracy, particularly in the proximity of the reference devices.Index Terms-TDOA, RSS, TOA, location, sensor networksAbstract-In short range communications, the use of RSS measurements in conjunction with TOA or TDOA leads to enhanced estimation accuracy with respect to the case where only TOA or TDOA are used. In this article, we derive the Cramer-Rao Bound (CRB) for location estimation accuracy of two different hybrid schemes: TOA/RSS and TDOA/RSS. For short ranges, the hybrid schemes offer improved accuracy, particularly in the proximity of the reference devices.

Effects of Correlated Shadowing: Connectivity, Localization, and RF Tomography

“…Node 2 may be disconnected while node 3 is connected, or vice versa, regardless of how close nodes 2 and 3 are to each other. Also, the fading on links (1,3) and (1,4) are independent, even though objects which attenuate link (1,3) probably also attenuate link (1,4). These disconnects between the i.i.d.…”

Geniş Bant Konum Belirleme Sistemi Performans Analizi ve İyileştirilmesi

“…Geliş zamanı (Time Of Arrival, TOA) veya alınan sinyal gücü (Received Signal Strength, RSS) ölçümü hedefin pozisyonu için bir daire tanımlayan alıcı ile hedef arasındaki uzaklığın belirlenmesini sağlar. Bu şekilde alıcı ile hedef arasında gerçekleştirilen geliş açısı (Angle of Arrival, AOA) veya geliş zamanı farkı (Time Difference of Arrival, TDOA) ölçümü ile yine hedefin konumu belirlenebilmektedir [7], [8], [9]. Kapalı alanlarda uzaklık tabanlı konum belirleme performansını alıcıların konumu [10], yapılan ölçümün niteliği ve sayısı [11] gibi etkenler değiştirmektedir.…”

Wireless Node Localization for V-shaped and Rectangular-shaped Node Deployment Schemes

“…In addition location estimation is useful in commercial, military, public safety and wireless sensor network applications [2][3][4]. A variety of location estimation techniques have been proposed for wireless networks, including TimeOf-Arrival (TOA), Angle-Of-Arrival (AOA), Received Signal Strength Indication (RSSI), neural networks, and Bayesian filters [5][6][7][8][9][10]. TOA-based systems require high-precision timing with synchronization components and signalprocessing technique to combat multi path effects, which further increases the system complexity.…”