Longer pings have more energy in them, and hence allow detection at longer ranges. But, longer pings reduce range resolution and increase the minimum range at which you can detect a target.
(I used to work on underwater sonar)
Longer pings have more energy in them, and hence allow detection at longer ranges. But, longer pings reduce range resolution and increase the minimum range at which you can detect a target.
(I used to work on underwater sonar)