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Vector sound intensity probe can be used to determine the DOA of a sound source by measuring the three orthogonal components of the sound-intensity vector. Typical vector sound intensity probes are composed of six or four sensors with symmetric structures. Such probes, in our opinion, are still not convenient for engineering implementation. A four-sensor vector sound intensity probe with arbitrary configurations is proposed here. The flexible structure of this probe allows it easily fix in any platform. In this paper, the direction finding algorithm based on this four-sensor probe is investigated first, then the error in direction estimates caused by instrument systematic error in sound intensity measurements are analyzed theoretically. Last, simulation experiments are conducted for testing the performance of DOA estimation based on this probe.

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