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AssigneeJenoptik Jena G.m.b.H.
InventorsThomas Braunschweig, Bernard Beck, Norbert Diete
Estimating the term…
A method and an arrangement for the automatic control of aerial photography cameras, in which a lens portrays the terrain overflown on a projected area, at least two photodetector rows being disposed on the projected area perpendicularly to the direction of motion of the terrain image and the direction and speed of motion of the terrain image on the projected area, the drift and the v.sub.g /h.sub.g ratio being determined from the signals of the photodetector. The method eliminating errors in the determination of v.sub.g /h.sub.g and drift, which are caused by tilts (.omega.) about the aircraft longitudinal and lateral (.psi.) axes. For this purpose the tilt (.omega., .psi.) of the aircraft is determined simultaneously with reading the photodetector rows and taken into consideration in the evaluation of the signals of the photodetectors.
In the method for the automatic control of aerial photography cameras, in which the displacement of a terrain image on a projected area is determined by comparing the image data from two photodetector rows disposed on a projected area essentially perpendicularly to the direction of motion of the terrain image, storing the image data of the row lying in front in the direction of motion of the terrain image temporarily and comparing it in a time-slot pattern with the image data of the second photodetector row and deterimining the ratio v.sub.g /h.sub.g from the time determined for the shift of identical picture structures from the first to the second row and determining the drift from the shift along the direction of the rows and converting these values into control data for the aerial camera, the improvement wherein essentially in the identical time-slot pattern, determining at least the magnitude of the tilt (.omega.) of the aircraft about its longitudinal axis, calculating the corresponding shift of the image of the picture structure from the magnitude of this tilt (.omega.) and taking into consideration the shift caused by the tilt (.omega.) in the comparison of the image data of the two rows.
In an arrangement for the automatic control of aerial photography cameras, comprising at least two photodetector rows disposed in a projected area of a lens preferably perpendicularly to the direction of motion of a terrain image, a signal processing unit which comprises at least one master clock, an intermediate storage unit for the image data supplied by the photodetector rows, a correlator circuit and a trigger pulse generating circuit connected in series with the two photodetector rows, the improvement wherein the signal processing unit has a data correction circuit connected to sensors for determining the magnitude of the tilts (.omega.) about the longitudinal and lateral (.psi.) axes of the aircraft.
Dependencies are inferred from the claim text.