Abstract: A radiation detection method utilizing essentially two serial arrangements of receiving elements which are rigidly connected to a reconnaissance plane (1) and of different lengths, which yield in longitudinal direction of sight the censor angle .epsilon. and on the ground the pictorial strips (6, 6'). The pictorial strips are arranged transverse to the axis (25) of the plane and parallel to each other. The processing of the signals is such that, by scanning the two serial arrangements with a time delay, a different signal signature results only if the scanned object (2) moves during over flight, independently of whether the reconnaissance plane (1) during the measuring operation is subject to a pitch angle .alpha. and/or a side slip angle .beta. and/or a roll angle speed. Moreover, in this way, it is also possible to independently obtain the target speed and direction.

Abstract: A method and circuit arrangement for performing surface measurements to enable a beam source to be triggered such that changes in the oscillation frequency, maximum scanning angle, and distance from the measurement surface of the scanner are automatically compensated for. In one embodiment an alternating voltage proportional to the lateral displacement of the impinging beam from a reference point is generated and then compared with a stepped reference voltage. A trigger signal is produced when the alternating voltage equals the reference voltage, so that the beam impinges at equidistant intervals. The reference voltage is adjusted to compensate for changes in distance and maximum scanning angle. In another embodiment, a pulse sequence is generated such that the number of pulses occurring in the scanning cycle is constant. The pulses are counted and the count is compared with reference values corresponding to equiangular intervals. A trigger signal is output if the count equals the reference value.