Signal Processing Algorithm Simulation And Software Design Of Long Range Ultra Short Base Line Position System

Long Range Ultra Short Base Line (LR-USBL) Position System is an underwater acoustic position system, which realize position, track and data communication to five underwater cooperative targets. USBL woks at responsion mode. The key technologies are high precision of target direction estimate and multi-targets identifiability.The main work of this paper contain two parts of content, simulation researching on high precision position arithmetic for USBL and the signal processing software design.The researching on position algorithm start from two ways. For single frequence signal, according to general USBL position principle, target positioned through measuring phase difference between different element of array by the technology of adaptive phase difference estimate. But the precision estimate result of this algoritm is not high, and can't satisfy request of the system. So, this paper use new array form and amending phase difference, both increase precision and avoiding phase ambiguity. For wide band signal, according to general SBL position principle, target positioned through measuring time-delay difference between different element of array by the technology of correlation time-delay estimation, in order to improve time-delay estimation precision, a algorithm named correlation peak interpolation is used. These two algorithms have simulated by MatLAB, satisfy request of the system and has the ability of multi-targets identifiability.The signal processing software run at the hardware designed by another schoolmate, realized signal real-time detecting, batch operation of phase difference estimate, and so on. Through laboratory simulation, the soft run well and the result is similar with theoretical value. It is proved that the method of single frequence signal phase difference estimation is feasible.