Table 1. Parameters used to remove background noise

Frequency	38 kHz	70 kHz	120 kHz	200 kHz
Horizontal extent (ping)	20	20	20	20
Vertical units	Samples	Samples	Samples	Samples
Vertical extent (samples)	5	5	5	5
Vertical overlap (%)	0	0	0	0
Maximum noise (dB)	–125	–130	–120	–135
Minimum SNR	10	10	10	12

SNR, signal-to-noise ratio.