Reinhard Schuster
CALIBRATION OF THE LH SYSTEMS ADS40 AIRBORNE DIGITAL SENSOR
Reinhard SCHUSTER*, Bernhard BRAUNECKER**
*Deutsches Zentrum für Luft- und Raumfahrt (DLR), Germany
Institute of Space Sensor Technology and Planetary Exploration
reinhard.schuster@dlr.de
**Leica Geosystems AG, Switzerland
bernhard.braunecker @leica-geosystems.com
Working Group IC-4
KEY WORDS: Photogrammetry, Camera, CCD, Sensors, Calibration, Radiometric Qualities
ABSTRACT
High performance photogrammetric cameras require high resolution geometric, spectral and radiometric calibration.
Instruments to meet the stringent specifications exist at LH Systems and DLR. The underlying principles of operation
are discussed with respect to the new LH Systems ADS40 airborne digital sensor, and the results of the first cross
measurement are reported.
1 INTRODUCTION
The rapid progress of electronic sensors will undoubtedly lead to the substitution of film-based photogrammetric
cameras by digital cameras. However, both analogue and digital cameras will be used in parallel by the
photogrammetric community for at least one decade. With the advent of the ADS40, a joint project of LH Systems and
Deutsches Zentrum fiir Luft- und Raumfahrt (German Aerospace Centre — DLR), the issues of sensor calibration must
be addressed. This paper reviews the calibration equipment currently in use at both locations. While the DLR equipment
is favoured owing to its great flexibility and the possibility of modifying geometric, radiometric and spectral
measurements in the development phase, the LH Systems equipment is optimised to industrial needs, especially through
fast and automatic measurement modes.
2 THE CALIBRATION-FACILITY AT DLR - EXAMPLES OF CALIBRATION RESULTS
The calibration facility located in the DLR Institute of Space Sensor Technology was originally developed for
calibrating spaceborne sensors (Schuster, 1994) and was later extended to the infrared spectrum. The optical scheme of
the calibration set up is shown in figure 1.
cal-source blackbody
halogen, hg x
or Xe filter x | slit-spot FE UAE rotation-tilt-table
| light- pol is-collimat N |
- vis-collimator IN |
| / \ | mixing-rod Stepper | |Vis-Sensor fcd
mm n] UU p UT ee A v | \ tu ite
lin \ | HA | n i vu A ER
LL lem DLL | JUL IN kde |
UH eo VU | | MWIR | TEH |
|t - UV] VA A \ p ' REDEEM.
md 1 | M
| | Vd | M ptt /
E | = | x | ly
light- ec mono- optics " | | LWIR X-Z-stage
Source shutter chromator == fas =
autocollimation- =
telescope
/ X IR-source
CSI
IR-collimator
Figure 1. Calibration facility at DLR (optical scheme)
288 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000.
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