The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Comparisons of Error Characteristics between TOA and TDOA Positioning in Dense Multipath Environment

다중경로 환경에서의 TOA방식과 TDOA방식의 측위성능 비교

  • 박지원 (충남대 공대 전자전파기정보통신공학부) ;
  • 박지희 (충남대 공대 전자전파기정보통신공학부) ;
  • 송승헌 (충남대 공대 전자전파기정보통신공학부) ;
  • 성태경 (충남대 공대 전기정보통신공학부)
  • Published : 2009.02.01
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Abstract

TOA(time-of-arrival) and TDOA(time-difference-of-arrival) positioning techniques are commonly used in many radio-navigation systems. From the literature, it is known that the position estimate and error covariance matrix of TDOA obtained by GN(Gauss-Newton) method is exactly the same as that of TOA when the error source of the range measurement is only an IID white Gaussian noise. In case of geo-location and indoor positioning, however, multi-path or NLOS(non-line-of-sight) error is frequently appeared in range measurements. Though its occurrence is random, the multipath acts like a bias for a stationary user if it occurs. This paper presents the comparisons of error characteristics between TOA and TDOA positioning in presence of multi-path or NLOS error. It is analytically shown that the position estimate of TDOA is exactly the same as that of TOA even when bias errors are included in range measurements with different magnitudes. By computer simulation, position estimation error and error distribution are analyzed in presence of range bias errors.

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References

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