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Octavian CRISTEA 1, Paul DOLEA 1, Vlad TURCU 2, Radu DANESCU 3 Long base-line stereoscopic imager for close to Earth objects range measurements 1: BITNET.

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Presentation on theme: "Octavian CRISTEA 1, Paul DOLEA 1, Vlad TURCU 2, Radu DANESCU 3 Long base-line stereoscopic imager for close to Earth objects range measurements 1: BITNET."— Presentation transcript:

1 Octavian CRISTEA 1, Paul DOLEA 1, Vlad TURCU 2, Radu DANESCU 3 Long base-line stereoscopic imager for close to Earth objects range measurements 1: BITNET CCSS, ROU 2: Romanian Academy, Cluj Branch, ROU 3: Technical University of Cluj-Napoca, ROU 2011 IAA Planetary Defense Conference, Bucharest, May 2011

2 END of life on Earth might come from the sky … ARE YOU AWARE?

3 In a wide area search mission, a telescope collects frames of data on consecutive directions in order to find objects in its range of detection. The probability to point a telescope having a field of view FoV = 1 0 x 1 0 to an unknown stationary target on the sky is N x (3 x ), where N is the number of scanned directions. This probability becomes even smaller in the case of a fast moving (close to Earth) object with unknown orbital parameters. The purpose of this project is to explore the ability of a very wide FoV stereoscopic imager to detect fast moving objects.

4 STEREOSCOPIC IMAGER PROJECT DEVELOPMENT MILESTONES Robotic Long Baseline Wide FOV Stereoscopic Imager for up to LEO/MEO orbits (LEOSCOPE-1). Proof of concept: 2011 Robotic Long Baseline “All Azimuth” Stereoscopic Imager for up to LEO/MEO orbits – 201? (LEOSCOPE-3) Robotic Pseudo-Stereoscopic Imager for HEO orbits – 201? (HEOSCOPE) Technology Development 2012 (LEOSCOPE-2) SECURED FINANCING

5 Robotic Long Baseline Wide FOV Stereoscopic Imager for up to LEO/MEO orbits (LEOSCOPE-1) Stereoscope setup. Wide FOV pair cameras take simultaneous consecutive photos of the sky. The stereoscope’s base-line is 37 Km, a compromise between simultaneous detection of low altitude objects from two locations and triangulation accuracy. Pair cameras synchronization is made through GPS. Geometric calibration of the image is made by matching captured stars in the image with an astronomical catalogue of stars. The recovery of orbital depth is made by correlating matching feature points from pairs of simultaneous images.

6 Piggyback wide FOV camera, component of the stereoscopic imager The telescopic GOTO equatorial mount is used for camera optical axis alignment and Earth rotation compensation. LEOSCOPE-1 pair camera sites Marisel (1150 m elevation) Feleacu (750 m elevation) GPS synchronization

7 The LEOSCOPE-1 camera LENS: 20 mm F/1.8 aspherical, 88.6 mm aperture, 94.5 degrees angle of view Actual CCD Array: 4752 x 3168 pixels Image area: 22.3 mm x 14.9 mm A/D converter: 14 bits, uncooled (will be replaced in 2011 by a research grade cooled CCD). Setup (CCD + lens) specifications: Angle of view: 66 degrees Limiting angular resolution: 1 arcmin/pixel Limiting magnitude (uncooled CCD): approx at 13.1 sky magnitude and 5 s exposure.

8 LEOSCOPE-1: sample (unprocessed) image area at resolution 3456 x 2304, 5 s exposure, without tracking Fast moving Leonid meteor

9 LEOSCOPE-1: sample (unprocessed) image areas at small resolution - 5 s exposure, without tracking - Airplane Leonid meteor ISS over Cluj-Napoca Notice city light pollution Two LEO satellites

10 LEOSCOP-1: automatic objects classification is made before depth reconstruction through parallax Examples of labeling distinct non- stationary objects in the images: Red = airplane Blue = condensation / irrelevant Green = LEO satellite

11 STEREOSCOPIC IMAGER: SHORT TERM PLANS AND AKNOWLEDGEMENTS LEOSCOPE-1 development and range recovery experiments for LEO/MEO objects – partially supported through a grant from the Romanian Research Authority. Development of a third sensor for High Earth Orbits surveillance (if founding will be available). Participation to the NATO RTO SET 147 Deep Space Resident Space Object Tracking (HEOSS) experiment, in order to test the stereoscopic imager performances. Thank you for your attention!


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