This proposal is a direct response to Challenge 22: Target detection in clutter. The Oceans Systems laboratory have a large experience in Target Detection and Classification in high resolution sonar imagery using a variety of techniques based on target responses and highlight shadow pairs[1,2,3]. Experiments on real scenarios show that these techniques work well in benign environments (flat and...

We present a new method for estimating the number and arrival times for overlapping signals with a priori known shape from noisy observations received by a sensor. The method is based on a recently developed eigenstructure technique for multitarget direction finding with passive antenna arrays and exploits the structure of the recejved signal covariance matrix. This problem is impriani in vario...

FM sonar sensors have been used in mobility aids for tile visually-impaired. However, previous FM sonar systems have generated continuous audio signals and rely on the user interpreting them. Our research work is carried out to solve the problem of overloading users of FM sonar system with excessive information by machine interpreting the audio signal. The signal is sampled and Fourier transfor...

1Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019-0016, USA 2Department of Computer Science, The George Washington University, Washington, DC 20052, USA 3Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan 4Air Force Research Laboratory/RHX, Brooks City Base, San Antonio, TX 78235, USA 5Core Software Department, i...

The ability of traditional active sonar processing methods to detect targets is often limited by clutter and reverberation from ocean environments. Similarly, multipath arrivals from radiating sources such as ships and submarines are received at sensors in passive sonar systems. Reverberation and multipath signals introduce constructive and destructive interference patterns in received spectrog...

This paper describes an empirical model of the time-offlight of a sonar sensor, derived from data collected with a Polaroid ultrasonic range finder. The goal of this model is to enable the acquisition of the profile of surfaces with a minimum error. These surfaces can present regions with different depths, corners and specular surfaces. To minimize the constraints of sonar sensors some software...

Our long term goal is to provide the Navy with a robust automated target cueing and identification capability for use with high resolution underwater imaging sensors such as Raytheon’s laser line scan system. These electro-optical sensors operate at standoff ranges to survey large areas of the underwater environment in search of naval targets of interest and are currently being incorporated int...

The "Sonar Hopf" cochlea is a recently much advertised engineering design of an auditory sensor. We analyze this approach based on a recent description by its inventors Hamilton, Tapson, Rapson, Jin, and van Schaik, in which they exhibit the "Sonar Hopf" model, its analysis and the corresponding hardware in detail. We identify problems in the theoretical formulation of the model and critically ...

A pedestrian tracking system using inertial sensors mounted on both feet is presented. Significant accuracy improvements are demonstrated, compared to single shoe tracking, by using sonar foot-to-foot range measurements to constrain heading drift. A single complementary Kalman filter fuses data from both inertial measurement units and the sonar sensor. The system is composed of commercial and c...

Fusion of multisensor data can improve target probability of detection but suffers from a potentially increased false alarm rate. The optimal sensor decision rule in the case of multiple sensor systems and known target location is of course a likelihood ratio test. This approach, however, is not applicable to many practical scenarios, such as sonar, in which the location of the target is not kn...