nethod to 
>sponding 
k. At our 
| we want 
ce of raw 
es in the 
ation time 
eral case. 
de angles 
lane. The 
| to move 
id gaps in 
t one is 
T: 
<1 (17) 
jefore the 
(H-z...) to 
CCD clock 
estroy the 
shown in 
pling. 
n between 
ls size (B) 
ig.1. The 
projected 
0.5. The 
can avoid 
1e and the 
els in the 
(18) 
ent in the 
motion as 
quations It 
hows, that 
orations of 
ally 
4 1995 
19 
  
distributed, uncorrelated and has a variance which is increasing 
  
Difference in Pixelunits 
a 200 400 600 
  
0.0 Ll. —áL delenda 
Line Number 
with SQRT(t,..,.)- Analysing the reordered attitude data of 
several flights we can say itis possible to predict over some ms 
with sufficient accuracy. So we ca could predict the optimum 
| next exposure time of the CCD lines. Note that in a case of a 
M" | stereo scanner, each line will have their own optimum exposure 
times ! À simple way is to formulate the stochastic model directly 
for the CCD clock time AT(t). As first experiments show it is 
accurate enough to predict the next exposure time (or the next 
AT(t)= AT’) using the last two calculated true AT (t) and AT (t,.). 
The CCD clock on-line control will be implemented in the 
WAAC Hard/Software in the next time. Then the next step 
toward to on- line photogrammetry has to be done. This 
EL 1 
1000 1200 
  
  
Fig. 4 The maximum distance between two 
consecutive lines 
  
distribution shape of angular accelerations over 10 seconds (x-axis) 
WATT TTT TTY Typ pes mImET 
  
  
  
  
  
  
  
  
Fig. 5 Histogram of roll angular 
accelerations 
should be the on-line correction of oversampling and motion 
blur in the projection plane. : 
References: 
Eckardt, A,1995, The Performance of the new Wide Angle Airborne Camera 
(WAAC), IAPRS, Vol.30, Part 5W1, ISPRS Intercommission Workshop 
"From Pixels to Sequences", Zurich, March 22-24 1995 
Jahn, H.,et al., 1994, Scientific Instrumentation for a Spaceborne Forest Fire 
Detection System, IAPRS, Vol. 30, Part 1 
Jahn,H. /Reulke,R.,1995, Systemtheoretische Grundlagen optoelektronischer 
Sensoren, Akademie-Verlag, Berlin, in print 
Müller, Fr.,1991, Photogrammetrische Punktbestimmung mit Bilddaten 
digitaler Dreizeilenkameras, Verlag der Bayerischen Akademie der 
Wissenschaften, München 
OEEPE, 1994, Workshop on digital camera for photogrammetry, 28th and 
29th September 1994, Saint Mandé,France,Institut Géographique National 
de France 
Sandau, R./Bärwald,W. 1994, A three line wide angle CCD stereo camera for MARS -94 Mission, IAPRS, Vol. 30, 
Part1 
Scheele, M./Terzibaschian,Th., 1994, Attitude and Positioning Measurement Systems used in the airborne testing of 
the original MARS Mission Wide Angle Optoelectronic Stereo Scanner WAOSS, IAPRS, Vol. 30, Part 1 
Schulz, W./Ludwig, R., 1954, Die Koordinatensysteme der Flugmechanik, Z. f. Flugwiss., Heft 3/4 
IAPRS, Vol.30, Part 5W1, ISPRS Intercommission Workshop "From Pixels to Sequences", Zurich, March 22-24 1995