A LED-based Technology to improve the orbit determination of LEO satellite

Paper number

IAC-17,A6,9,5,x41229

Author

Ms. Silvia Masillo, Sapienza - University of Rome, Italy

Coauthor

Mr. Davide Morfei, Sapienza - University of Rome, Italy

Coauthor

Dr. Gianmarco Locatelli, Sapienza - University of Rome, Italy

Coauthor

Mr. Nicola Marmo, Sapienza - University of Rome, Italy

Coauthor

Prof. Fabio Santoni, University of Rome “La Sapienza”, Italy

Coauthor

Dr. Fabrizio Piergentili, University of Rome "La Sapienza", Italy

Coauthor

Ms. Alice Pellegrino, Sapienza - University of Rome, Italy

Coauthor

Dr. Tommaso Cardona, University of Rome "La Sapienza", Italy

Coauthor

Dr. Marco M. Castronuovo, Italian Space Agency (ASI), Italy

Coauthor

Prof. Patrick Seitzer, University of Michigan, United States

Coauthor

Prof. James Cutler, University of Michigan, United States

Coauthor

Prof. Peter Washabaugh, University of Michigan, United States

Coauthor

Mr. Srinagesh Sharma, University of Michigan, United States

Coauthor

Mr. Chris H. Lee, University of Michigan, United States

Coauthor

Mr. Robert Gitten, University of Michigan, United States

Year

2017

Abstract

The tracking of LEO objects, by means of large field of view (FOV) optical telescopes, is very challenging. Generally, optical tracking is only possible when the LEO satellite is in sunlight and the ground station is in darkness. This limits the tracking availability to morning and evening twilight for maximum five minutes at a pass.
At worldwide level, several activities and studies are currently under development in order to improve the space surveillance capabilities. To this aim, Sapienza - University of Rome, together with the Astronomy Department of University of Michigan, are collaborating in the framework of the LEDSAT (LED-based SATellite) project. A LEO 1U CubeSat, equipped with LEDs (Light Emitting Diodes) is used as calibration target for optical observations for tracking the CubeSat.
Through active illumination on the nanosatellite, the possibility to observe LEDSAT, by using ground-based telescopes, will increase since direct Sun illumination is no longer needed.
The payload will flash with different patterns, on the basis of an accurate timing generated on-board. In this way, high timing precision on the ground-based system is not necessary. Thus, very simple and currently operating optical telescopes can be used for tracking, i.e. those in the amateur astronomy community.
This paper describes the LEDSAT concept and the related science case. Moreover, the detectable LED-based payload configuration and the studies performed on the orbit determination feasibility are presented.
In particular, the detectability is validated by Signal to Noise Ratio (SNR) and Apparent Magnitude analyses. In addition, simulations of a tumbling LEDSAT with different flash patterns are shown. The reliability of the orbit determination is demonstrated by a batch filter. Furthermore, Montecarlo runs show the achievable accuracies on the basis of different frequencies measurements and instruments precisions.
Moreover, the architecture of the LEDSAT ground segment is outlined, with particular emphasis on the optical Ground Stations Network, which includes six observatories.

Abstract document

IAC-17,A6,9,5,x41229.brief.pdf

Manuscript document

IAC-17,A6,9,5,x41229.pdf (🔒 authorized access only).

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