Indoor 3D Positioning Method for a Microphone using a Single Speaker

This study investigates an indoor 3D positioning method for a microphone using a single speaker. The proposed method estimates the distance, azimuth, and elevation of the microphone from the speaker and calculates the 3D position of the microphone. Multiple short signals with different frequency bands were transmitted sequentially at sufficient intervals to avoid the influence of indoor reflected waves. We extracted these signals at the receiver side, and their amplitude spectra were computed. The azimuth and elevation of the microphone were estimated by matching the obtained amplitude spectrum with the reference data previously measured at each azimuth and elevation. The distance was estimated from amplitude attenuation. The 3D positioning performance was evaluated at ten points in a practical environment. The results show that the 90-th percentile value of the error was 0.583 m.