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Acoustic passive orientation is the most commonly used acoustic monitoring technology. The information of sound pressure, particle velocity and sound intensity of the sound wave radiated from the ground target were made full use in the method of passive bearing estimation based on the theory of acoustic vector sensor. Target direction finding can be achieved by acquiring particle velocity information or sound intensity information. In the paper, a comparative research was made on the direction finding method based on particle velocity and the method based on sound intensity. The specific algorithms of the two methods were given, and experimental research was carried out. The results show that when the sensor size is 0.3 m, the accuracy of sound intensity direction finding method combined use of sound pressure information and particle velocity information is better than that only use particle velocity information. Under the same conditions, sound intensity direction estimation method could significantly improve the accuracy of target direction estimation.
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