Large-region acoustic source mapping using a movable array and sparse covariance fitting.
Large-region acoustic source mapping is important for city-scale noise monitoring. Approaches using a single-position measurement scheme to scan large regions using small arrays cannot provide clean acoustic source maps, while deploying large arrays spanning the entire region of interest is prohibitively expensive. A multiple-position measurement scheme is applied to scan large regions at multiple spatial positions using a movable array of small size. Based on the multiple-position measurement scheme, a sparse-constrained multiple-position vectorized covariance matrix fitting approach is presented. In the proposed approach, the overall sample covariance matrix of the incoherent virtual array is first estimated using the multiple-position array data and then vectorized using the Khatri-Rao (KR) product. A linear model is then constructed for fitting the vectorized covariance matrix and a sparse-constrained reconstruction algorithm is proposed for recovering source powers from the model. The user parameter settings are discussed. The proposed approach is tested on a 30 m × 40 m region and a 60 m × 40 m region using simulated and measured data. Much cleaner acoustic source maps and lower sound pressure level errors are obtained compared to the beamforming approaches and the previous sparse approach [Zhao, Tuna, Nguyen, and Jones, Proc. IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP) (2016)].
Advanced Digital Sciences Center (ADSC), 1 Fusionopolis Way, Number 08-10 Connexis North Tower, Singapore 138632, Singapore.
Shengkui
S
Zhao
Advanced Digital Sciences Center (ADSC), 1 Fusionopolis Way, Number 08-10 Connexis North Tower, Singapore 138632, Singapore.
Cagdas
C
Tuna
Advanced Digital Sciences Center (ADSC), 1 Fusionopolis Way, Number 08-10 Connexis North Tower, Singapore 138632, Singapore.
Thi Ngoc Tho
TN
Nguyen
Coordinated Science Laboratory, University of Illinois at Urbana-Champaign, 1308 West Main Street, Urbana, Illinois 61801, USA.
Douglas L
DL
Jones