To evaluate the functionality of sonars or other acoustic equipments, real submarine targets or acoustic reflectors have been traditionaly used. Such direct methods are very nuisance because it is difficult to set up the system in poor ocean environment. To overcome this difficulty, we have developed a simulated target system for sonar using acoustic transducers. To do this, we devise a model that simulates the response of a underwater target in front of a sonar in active mode.
To analyze the characteristics of reflection from a real target in the sea, we describe the underwater acoustic propagation using the wave equation in spherical coordinates. We also consider the target strength, sonar equations including the spectrum of sonar transmission pulses.
In this thesis, we propose a hardware implementation methodology of highlight elongation and doppler for echo modeling. we also suggest the best input parameters for the system design as well as TTL hardware circuitry.
The implemented hardware consists of a transmitter with transducers, a receiver that collects the ping signal projected by a sonar, and an echo processor that extracts information of the simulated target from the received signal.
