ABSTRACT
In the age of modern warfare the theory of detection and estimation has become a very important topic. The development of radar, sonar, digital communications, and digital signal processing has immensely stimulated these areas. With the advent of the flying machine, which can deliver ordinance to any point at any time, early detection has become essential. World War II has a rich warfare history that demonstrates the importance of detecting enemy attacks reasonably early to allow for countermeasures or at least for some evasive action. Detection must be sufficiently early to minimize the loss of life. Of course, to obtain a timely warning, early detection is essential and hence, detection must usually be accomplished at very low signal-to-noise ratios. The emphasis of the text is on the detection aspect, that is, the declaring of the occurrence of a particular event with some measure of confidence. Estimation can be interpreted as an extension of the detection part.
