Title :
Fast techniques for time delay estimation
Author_Institution :
Dept. of Electron. Eng., Rome Univ., Italy
Abstract :
Two multiplication-free correlators (the hybrid sign and polarity coincidence correlators) are analyzed as fast alternatives to the direct multiply-and-accumulate technique in time delay measurements. Their accuracy limits are given for general signal and noise spectra and their dependence on signal-to-noise ratio (SNR), observation interval, and signal bandwidth is analyzed for a reference case, PC (polarity coincidence) variance has been verified to decrease uniformly with increasing SNR while HS (hybrid sign) variance does not. PC is verified to be a powerful tool if a certain loss in accuracy can be tolerated or recovered by properly enlarging the observation interval
Keywords :
correlation theory; spectral analysis; HS; PC; SNR; direct multiply-and-accumulate technique; hybrid sign correlators; hybrid sign variance; multiplication-free correlators; observation interval; polarity coincidence correlators; polarity coincidence variance; signal bandwidth; signal-to-noise ratio; time delay estimation; Bandwidth; Correlators; Delay effects; Delay estimation; Hardware; Logic; Noise cancellation; Signal to noise ratio; Speech analysis; Time measurement;
Conference_Titel :
Electrotechnical Conference, 1989. Proceedings. 'Integrating Research, Industry and Education in Energy and Communication Engineering', MELECON '89., Mediterranean
Conference_Location :
Lisbon
DOI :
10.1109/MELCON.1989.50011
