Measuring Angular Variation of Target Strength for Simple Geometric Objects. CDR Ed Tucholski US Naval Academy Annapolis, MD. Reflected Wave. Object. Transmitter/ Receiver. Original Wave. Distance r. Drawing Source: Wikipedia. Active Sonar Equations.
Measuring Angular Variation of Target Strength for Simple Geometric Objects
CDR Ed Tucholski
US Naval Academy
Drawing Source: Wikipedia
Function of geometry and scattering direction
Noise Limited Case
Reverberation Limited Case
The reflected intensity (pressure) is dependent on the reflection, diffraction, and interference of sound scattered off the object.
Target Strength is highly dependent on the scattering angle.
The teaching point of this demonstration is to show the angular dependence.
For simplicity, we will measure
and Positioning System
Wavetek Model 29
Sine 40.04 kHz
18.1 V p-p
Source A, AC Coupled
6 dB/oct band pass, 10k-100k HZ
Gain = 20
Ch 1 10 V/div
Ch 2 50 mV/div
t = 10.0 ms
Ch 2 100 mV/div
t = 4.00 s