A simplified sequential detection scheme

The utilization of phased arrays makes it possible to build radars which adapt their scan pattern according to the given conditions. Thus, sequential detection (SD), which involves varying the dwell time, becomes a possibility. The key idea in SD is based on the use of a pair of thresholds, which depend on the number of the pulse, to make a decision as soon as the available evidence justifies it. A statistical theory of the considered processes has been developed by Wald (1947). Attention is given to a simple example of Wald's theory, and the practical aspects involved. It is shown that sequential detection is a signal processing technique which could be useful in phased array search radars that allow adaptive beam scheduling.