Summary
Project Goals
The ALIS4D
Filter
First RADON transform
Second RADON transform
Selection Conditions
Results
ALIS 4D AUTO-SSA
Gabriel Borderes Motta
Tima Sergienko, Daniel Kastinen, Urban Brändström, Lars-Henrik Snow, Johan Kero (IRF)
Hanna Sundberg, Stefano Barra, Jacob Ask, Petrus Hyvönen (SSC)
Pulmu Pietikäinen (LTU)
Project Goals
Space Situation
https://whatsin.space/
Project Goals
ALIS 4D AUTO-SSA
ALIS 4D is a wide-field optical system with cameras operating in visible and near-infrared regions. The ALIS 4D system aims to support research on light phenomena in the upper atmosphere, such as northern lights. The system can monitor a large part of the sky with overlapping fields of view from different stations. Within this context, we raise the following questions:
Can we use ALIS 4D to identify and determine the orbit of space objects (SO)?
What can be the main contributions of ALIS 4D to the space debris tracking framework?
How should an ALIS 4D campaign be scheduled and executed?
Aiming to answer these questions, we developed an algorithm to identify SO traces and compute their orbits.
The ALIS4D
- Baselines of the station: about 50 - 100 km
- Field of view: about 150 degrees
- 17 filters, filter-wheel (8 positions)
- Highly light-sensitive and high-resolution scientific EMCCD detectors
- Temporal resolution up to 25 images/s
- Spatial-resolution: ca. 750 m at 100 km altitude
The ALIS4D
The ALIS4D
High latitude
The ALIS4D
High latitude
The ALIS4D
Filter
A FITS image
Filter
Original Image
Filter
Filtered Image
First RADON transform
$$
\mathfrak{R}\{ f(x,y)\} = \int _{-\infty}^{\infty} f(\bf{r}) \cdot d \bf{l} = \int _{-\pi}^{\pi} f(\bf{dist}) \cdot d \bf{\theta}
$$
$$
x = dist \cos \theta + x_{c}\\
y = dist \sin \theta + y_{c}
$$
$$
x = dist \cos \theta + x_{c}\\
y = dist \sin \theta + y_{c}
$$
First RADON transform
First RADON transform
Second RADON transform
Second RADON transform
Selection Conditions
First Condition
$$ \frac{PS_{time}^{ij}}{PS_{img}^{ij}} > 1 $$
Selection Conditions
Second Condition
$$ PS_{img}^{ij} > (\overline{PS} + \sigma _{PS})_{img} $$
Results
2020-04-01-19:49
Abisko Kiruna
Silkkimuotka Tjautjas
Results
2020-04-01-19:51
Abisko Kiruna
Silkkimuotka Tjautjas
Results
2020-04-01-19:55
Abisko Kiruna
Silkkimuotka Tjautjas
Results
2020-04-01-20:05
Abisko Kiruna
Silkkimuotka Tjautjas
Results
Results
2020-04-01T19:49 UTC
42599 THORAD DELTA 1 (debris object),and 39771 H-2A R/B, which is a debris object from a Japanese H2A rocket body (20200401T194900b).
Results
2020-04-01T19:52 UTC
16182 SL-16 R/B (rocket body)
Results
2020-04-01T19:53 UTC
continuation of 16182 SL-16 R/B (rocket body)
Results
2020-04-01T19:57 UTC
43610 CZ-2C R/B (rocket body)
Results
2023-02-27-18:15
Abisko Kiruna Esrange
Silkkimuotka Tjautjas
Thank you for your attention!
Acknowledgements
The "ALIS 4D AUTO-SSA" project is financed by the Swedish National Space Agency NRFP4 grant 2020-304. It is also partly funded by the EU project RIT (Rymd för innovation och tillväxt/Space for innovation and growth) with the objective of developing the space region in northern Sweden.