System for measuring position and/or velocity

摘要

System for measuring the relative position and/or velocity of two objects with respect to each other and/or with respect to a common reference system, such as the ground, according to the magnitude and direction thereof, using electro-optical measuring means, the improvement comprising: (1) producing images of the object to be measured in at least two different spatial positions; (2) producing A.C. electrical signals of different frequency proportional to the relative movements of these images to at least one optical correlation system; and (3) evaluating these signals, with the use of the trigonometrical relationships of the perspective imaging, in a computer to determine the measured values.