抄録
A set of Signals build on M-sequence, its preferred sequence and their anti-symmetric sequences takes a figures down one place from those of Gold sequences in error standard deviation of an acoustical positioning system. The system, which consists of several signal transmitters encircling the object, is Phase Reversal Keying (PRK) of a pseudo random sequence in discussion. The processor on the object detects the signals with the matched filter of complex absolute detection type being free from errors caused by unknown phase shift and estimates its position based on the Maximum A Posteriori (MAP) criterion.
