The ABCS Program for the Analysis of Echo Sounder Returns for ...

DSTO-GD-02151st input2nd inputReturned Signal Power (W)3x10 -62x10 -61x10 -64x10 -6 3rd input4th inputSum of first four inputs0.06 0.07 0.08 0.09 0.100Time (sec)Figure 17: Summing the first four constant power inputs for the sine wave used (see Figure 2).There are more inputs to simulate the whole sine input, but these were left out sothe graph is not too complicated. Each input had a duration ∆t = 0.01 msec. Input1 had zero amplitude. Input 2 had a time shift of ∆t. Input 3 had a time shift of2∆t. Input 4 had a time shift of 3∆t.When calculating the returns the following assumptions were made:• The seafloor is flat.• The backscatter strength is constant with angle.• An omnidirectional source and receiver.Thus any plots produced by this program will have these assumptions.31