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Stellar Calibration of the Smart Panoramic Optical Sensor Head (SPOSH)

Elgner, S. and Oberst, Jürgen and Flohrer, Joachim and Albertz, J. (2006) Stellar Calibration of the Smart Panoramic Optical Sensor Head (SPOSH). Fifth International Symposium Turkish-German Joint Geodetic Days, 2006-03-29 - 2006-03-31, Berlin.

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Abstract

The SPOSH camera is designed for observations of transient phenomena on the night hemisphere of Earth (or other planets) from an orbiting spacecraft. It is currently being tested during observation campaigns for meteors from ground. The camera features a highly sensitive (1024 x 1024) CCD chip, a wide (>120°) field of view, is typically operated at a high rate (2 frames / sec) and has sophisticated built-in software for event detections and reporting. To calculate celestial positions and trajectories for recorded meteors it is necessary to determine the parameters for the inner and exterior orientation of the camera. Our camera model includes three orientation angles w, f, k, the focal length, the coordinates of the principal point and a second order polynomial describing the radial distortion. The model parameters are determined by stellar calibration using images of star fields recorded during recent meteor campaigns. Star positions in the images are determined from the maxima of Gauss functions fitted to the observed pixel patterns. The use of stars with their precisely known positions taken from a star catalog warrants high calibration accuracy. In recent tests we identified approximately 5.000 stars in a single image, more than 1700 of which could be related to catalog entries. After the analysis, the residual error of star positions is on average 0.25 pixels. The calibration software is developed under IDL (Interactive Data Language) and is intended to be user-friendly for less experienced users.

Item URL in elib:https://elib.dlr.de/43561/
Document Type:Conference or Workshop Item (Speech)
Title:Stellar Calibration of the Smart Panoramic Optical Sensor Head (SPOSH)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Elgner, S.UNSPECIFIEDUNSPECIFIED
Oberst, JürgenUNSPECIFIEDUNSPECIFIED
Flohrer, JoachimUNSPECIFIEDUNSPECIFIED
Albertz, J.TU BerlinUNSPECIFIED
Date:31 March 2006
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SPOSH, camera calibration, least-square analysis, refraction
Event Title:Fifth International Symposium Turkish-German Joint Geodetic Days
Event Location:Berlin
Event Type:international Conference
Event Dates:2006-03-29 - 2006-03-31
Organizer:TU Berlin
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Vergleichende Planetologie (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Brinkmann, Bärbel
Deposited On:16 Jun 2006
Last Modified:12 Dec 2013 20:19

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