Vorrichtung zur Anzeige von akustischen oder elektromagnetischen Signalen

摘要

An improved apparatus for providing a polar coordinate indication at an image frequency which produces still pictures, e.g. on a cathode-ray tube, of a scanning function A = g(x) furnished by an electronic scanner by scanning received acoustical or electromagnetic signals, e.g. from sonar or radar system, wherein A is the signal intensity and the independent variable x is the angle of incidence phi ; the frequency for some other parameter of the received signal, wherein the independent variable x is indicated by the angular deflection of the indication and the signal intensity A is represented by the radial deflection of the indication. Various alternative types of representations of the scanning function utilizing this scheme are provided. According to one type of representation the course or shape of the scanning function curve may be indicated with respect to a zero reference circle, preferably with the area beneath the curve also indicated or brightened in the case of a cathode-ray tube indicating device. According to a further type of representation the maximum values of all or selected scanned signals are determined and indicated as radial lines or spokes. Apparatus is also provided for simultaneously presenting both of these types of indications or indications representing different types of scanning functions in different sectors of the image field of the polar indication.