arXiv:2611.06285v1 Announce Type: new Abstract: This paper presents a virtual microphone array approach for estimating the direction of arrival of a sound source using a moving microphone and a stationary reference microphone. The method exploits the microphone motion to generate a time-varying array geometry, using fiber-optic position sensing to reconstruct the trajectory and determine the resulting virtual microphone configurations. For each configuration, the estimated time difference of arrival between the two microphone signals and the corresponding microphone geometry define a hyperboloid representing all possible sound source positions consistent with the time difference. By combining multiple hyperboloid constraints, the direction of arrival can be estimated in azimuth and elevation relative to the microphone coordinate system. In contrast to conventional arrays with fixed geometries and approaches based on predefined microphone trajectories, the proposed method derives the virtual array geometry directly from the measured microphone motion, enabling a spatially distributed virtual array to be formed using only two physical microphones and offering potential for size- and weight-constrained applications. The approach was experimentally evaluated under controlled low-reflection conditions for different source positions, source distances, and signal characteristics. The influence of microphone motion was further examined, and the method was tested with a moving sound source. The results demonstrate the feasibility of direction-of-arrival estimation using a virtual microphone array without requiring a predefined microphone trajectory.