So far , there has been plenty of theory and method serving for doa . among them , one method has been paid much attention for worldwide researchers who have spent more than 30 years to develop and perfect it . this is the namable " time delay estimation ( tde ) " 而在這些眾多的方位估計(jì)方法中,有一種方法讓世界范圍的科研工作者為之關(guān)注并已花費(fèi)了三十余年的時(shí)間去不斷地發(fā)展和完善它,這就是著名的“時(shí)延估計(jì)法( timedelayestimation ) ” 。