Propagation Loss Analysis Screen

WADER Sonar Range Prediction and Global Ocean Information System for underwater acoustics, sonar range predictions and ocean environment analysis

The analysis screen is the final step in the range prediction process and displays the results obtained from running the propagation and reverberation loss models using the data supplied in the Main Screen, Environment Screen and Sonar Editor.

Top left is the Probability of Detection diagram (PODgram) which provides a colour coded summary of sonar ranges against targets at different depths. Ranges are presented as % Probability of Detection: 25-50, 50-75 and >75%.  The X axis corresponds to the distance along the track marked on the Main Screen.

The PODgram panel can be changed to display a best source depth for the sonar, intensity distribution chart & overlay EIA data.

Top right shows the propagation and reverberation loss curves (in yellow) for four target depths. We believe that the use of reverberation loss curves is a unique WADER feature and allows a direct comparison between received propagation loss and reverberation.

Bottom left is the control panel where a range of parameters may be modified such as frequency, target depths, sonar depths and beam patterns. In addition the effect of reverberation may be evaluated by turning the embedded reverberation module off.

Bottom right is the acoustic ray trace with separate ray traces for the transmitter and receiver.

Note the slider controls at the side of the ray trace. These can be used to change the transmitter and receiver depths and produce a real time ray trace update. The PODgram updates when the mouse releases the slider control. When combined with the layer depth and channel markers, this provides a powerful tool in both operational and teaching environments.