Application of time-delay-and-integrate c.c.d.s in sector scanning sonars

Non-uniform time-delay-and-integrate (n.u.t.d.i.) devices have been designed and used for fast beam scanning. The possibility of using such devices for very high angular resolution is examined and it is shown that there must be a trade-off between the number of angular resolution cells and the scanning rate. It is shown however that an improved sector scanning sonar may be realized by combining modulation scanning with time delay scanning. It is also shown how the n.u.t.d.i. device can be used to advantage for solving the ambitious problem of two dimensional beam scanning.