Quasi-optimal DOA estimation scheme for gimbaled ultrasonic moving source tracker

Seul Ki Han, Hye Kyung Lee, Won Sang Ra, Jin Bae Park, Jae I.I. Lim

Research output: Contribution to journalArticlepeer-review


In this paper, a practical quasi-optimal DOA(direction of arrival) estimator is proposed in order to develop a one-axis gimbaled ultrasonic source tracker for mobile robot applications. With help of the gimbal structure, the ultrasonic moving source tracking problem can be simply reduced to the DOA estimation. The DOA estimation is known as one of the representative long-pending nonlinear filtering problems, but the conventional nonlinear filters might be restrictive in many actual situations because it cannot guarantee the reliable performance due to the use of nonlinear signal model. This motivates us to reformulate the DOA estimation problem in the linear robust state estimation setting. Based on the assumption that the received ultrasonic signals are noisy sinusoids satisfying linear prediction property, a linear uncertain measurement model is newly derived. To avoid the DOA estimation performance degradation caused by the stochastic parameter uncertainty contained in the linear measurement model, the recently developed NCRKF (non-conservative robust Kalman filter) scheme [1] is utilized. The proposed linear DOA estimator provides excellent DOA estimation performance and it is suitable for real-time implementation for its linear recursive filter structure. The effectiveness of the suggested DOA estimation scheme is demonstrated through simulations and experiments.

Original languageEnglish
Pages (from-to)276-283
Number of pages8
JournalTransactions of the Korean Institute of Electrical Engineers
Issue number2
Publication statusPublished - 2012 Feb

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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