@article {470,
	title = {Ultrasonic Multitransducer System for Classification and 3-D Location of Reflectors Based on PCA},
	journal = {IEEE Transactions on Instrumentation and Measurement},
	volume = {58},
	year = {2009},
	month = {09/2009},
	pages = {3031 - 3041},
	abstract = {This paper presents a system to classify and locate
basic ultrasonic reflectors (plane, corner, and edge) in 3-D environments.
The classification system is based on the principalcomponent-
analysis (PCA) technique, using the time of flight
(TOF) as the classification parameter. The system proposes a sensorial
structure to simultaneously obtain up to 16 TOFs at every
emission/scanning process. A particular and different macrosequence
has been assigned to every transducer in the sensorial
system to encode their emissions. These macrosequences, obtained
from complementary sets of sequences, allow simultaneous emission
and reception to be carried out with all the transducers for
the same scanned environment. The set of obtained TOFs make it
possible to identify the type of ultrasonic reflector, as well as its
position in 3-D environments. The results achieved by the classification
system are presented for both simulated and real data.},
	keywords = {Classification system, macrosequences, principal},
	issn = {0018-9456},
	doi = {10.1109/TIM.2009.2016820},
	author = {Alberto Ochoa and Ure{\~n}a, J. and {\'A}lvaro Hern{\'a}ndez and Manuel Mazo and Jose Antonio Jimenez and Mar{\'\i}a del Carmen Perez}
}
