Direct joint source localization and propagation speed estimation
ICASSP '99 Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 03
A constrained least squares approach to mobile positioning: algorithms and optimality
EURASIP Journal on Applied Signal Processing
IEEE Transactions on Signal Processing
Exact and Approximate Solutions of Source Localization Problems
IEEE Transactions on Signal Processing
Efficient 2-D DOA estimation for coherent sources with a sparse acoustic vector-sensor array
Multidimensional Systems and Signal Processing
Fast DOA estimation of incoherently distributed sources by novel propagator
Multidimensional Systems and Signal Processing
TDOA-based acoustic source localization in the space---range reference frame
Multidimensional Systems and Signal Processing
Hi-index | 0.00 |
The propagating speed of waves depends on the physical properties of the transmitting material. Since these properties can vary along the propagation path, they cannot be determined from local measurements. However, mean values of the propagation speed can be obtained from time measurements, either between distributed sources and sensors (Time Of Arrival, TOA) if both are synchronized or otherwise from time differences between distributed sensors (Time Difference Of Arrivals, TDOA). This contribution investigates the required assumptions for speed estimation from time measurements and provides closed-form solutions for the synchronized and unsynchronized case. Furthermore the achievable accuracy is determined in terms of Cramer-Rao bounds. The analysis is carried out for the propagation of sound waves in air, where the propagation speed varies with the air temperature. Example results from loudspeaker-microphone recordings are provided. However the closed-form relations apply also to the propagation of other types of waves in linear regimes. This manuscript extends previous work by the authors by providing closed-form solutions and by a parallel treatment of the TOA and the TDOA measurements.