possible as quicklook on the colour-TV. The orientation data 
(roll, pitch, yaw, speed, altitude) were measured by a 
gyroscope-system and recorded in line on the tape. A real-time 
correction was not possible, because of the small processor 
performance. The corrections took place on ground with the help 
of the recorded orientation data. 
The system was installed in the aircraft in a rack, because of 
the security during the flight. To decrease the air-stream into 
the scanner, the scanner platform contained a movable spoiler. 
On ground the tapes were read into the central VAX 11/785 station 
of the Institute (fig.5). In the same time TIR data and flight 
orientation data were separated. The TIR data were arranged to 
images. These images were processed, as described in 6. Both the 
rough data and the resulting images were stored in the computer 
for archiving. There the data access for other institutions is 
possible. 
5. Computer Aided Airborne und Ground-System 
The present state of the computer-technique allows the use of 
Personal Computers (PC) on the basis of 32 bit processors. Espe 
cially suitable in this connection are industry-PC's. They offer 
in the 19" rack more mechanical and thermal resistance and better 
possibilities of secure installation in the aircraft compared 
with usual PC's. Such an equipment will be used in this year's 
flight campaign. The basic configuration is shown in fig.6. 
The TIR-Scanner is connected with the PC by a parallel digital 
I/O-port. The data are read during the scan into the operating 
memory of the PC and are simultaneously shown for quicklook on 
the computer grafic display. When one scan-line is finished the 
data are transmitted to a virtual disc, to reach the maximal data 
transmission rate. This virtual disc has a storage capacity of 3 
MByte. Therefore it is possible to store data of a 30 km flight 
route over a time of 10 minutes, if the common data rate of all 
sensors is 5 kByte/s. When the storing of one flight route is 
finished the data have to be transmitted from the virtual disc to 
the hard disc. In our case this is a portable hard disc with a 
storage capacity of 90 MByte. On this way it is possible to 
record data of 30 flight routes with the length of 30 km on one 
portable hard disc. If necessary more portable hard discs can be 
used. 
In the same time data of navigation and orientation are recorded. 
On the one hand it is possible to record selected data from the 
aircraft navigation system by means of an ARINC-interface-slot in 
the PC and on the other hand to record orientation data directly 
from additional gyroscopes. 
The recording of a flight route in the visible range will be done 
by camcorder, metric aerial survey camera or CCD-line-camera 
(push-broom-scanner). The first two systems offer enough storage 
capacity to record remote sensing flights about some hours. In 
addition there is the advantage of two dimensional image 
recor-