tical
even
ed
- 165 -
with 14 tracks, one of the tracks serving for EOS recording. In the
GSOC (German Space Operation Center), the magnetic tape is played back
at a slower rate in the magnetic tape reproduction unit, Ampex FR 2000A.
The delayed signal produces a computer compatible magnetic tape (CCT)
via synchronization electronics and a computer(Fig. 8). This data carrier
could serve for any further processing in the computer. In the present
case, image information is again read into the computer from the magnetic
tape, followed by pre-processing, if required (e.g. change of level and
contrast intensification), the last stepbeing the production of a film
strip in the LINOSCAN type image reproduction equipment. The line densi-
ty of this reproduction amounts to 16 lines/mm = 62 p per image point.
The line length, that is the width of the film strip, which contains
1728 image points, amounts to approx. 110 mm. This corresponds to 6! p
per image point and thus to a five fold magnification as against the
"Original image", that is the active sensor line length amounting to
130 x 1728 - 22,16 mm. This fact must be taken into account when compa-
ring the resolution quality with an aerial photograph.
Flight Testing
For the first test flights, the DFVLR made available the "Skyservant"
DO 28 which had already been used and equipped for the German remote
sensing research programme. The EOS camera was mounted on a roll-stabili-
zed frame to compensate for the motion of the aircraft.
Figures 9 and 10 show the camera and electronic module installed in the
aircraft.
In early April and May 1978 , the first test flights were carried out,
first to principally test the interaction of all components and to pro-
duce opto-electronic aerial scanning strips for the first time. Many
strips with different filter and aperture settings were taken in the
South-east area of Munich, between Lake Starnberg and Lake Ammersee,
HohenpeiRenberg and Lake Kochel. Image scanning was carried out at an
altitude of approx. 1,000 to 1,2000 m, the flight speed amounted to
170 to 210 km/h, the scales of picture reproduction were approx.
