Time-Frequency Detection: Application to Sub-Bottom SONAR

November 2000

introduction

Figure 1

Figure 1

Figure 1: 4 kHz Parasound echo traces.
Due to insufficient heave compensation the bottom first break and later returns
show a wavy incoherence. Also crosstalk from a second acoustic system is present,
showing as a slanting series of stripes mixed with the Parasound signals.