A comparison of the accuracy of TDOA and TOA location algorithms with equivalent receiver geometry

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Authors
  1. Colman, G.W.K.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
Recent regulations in the United States have required that cellular telephone providers be able to geolocate phones within 100m 67% of the time for Enhanced 911 services. This requirement has increased the interest in the problem of geolocation. Two methods of geolocation, namely Time Difference of Arrival (TDOA) and Time of Arrival (TOA) are methods likely to be implemented to achieve this goal. This document outlines some of the strengths and weaknesses of these two methods of geolocation. In it, we describe the two methods of geolocation, and then using simulation tools, we explore how each of the systems would perform under various types of system error. The different scenarios include Gaussian error, bias and having a non line of sight component on one of the received signals. As well as this, we see how the system is affected both by increasing the number of receivers and by increasing the difference in altitude between the transmitter and the receiver array. It is shown in this document that, synchronization issues aside, TOA is a more accurate locator, however TDOA is much more practical from an implementation viewpoint.

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Keywords
TDOA (Time Difference of Arrival);Non-line-of-sight (NLOS) channels;Cellular telephones;Geolocation;Enhanced 911
Report Number
DRDC-OTTAWA-TM-2001-063 — Technical Memorandum
Date of publication
01 Oct 2001
Number of Pages
53
DSTKIM No
CA020778
CANDIS No
517521
Format(s):
Hardcopy;Document Image stored on Optical Disk

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