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SALSAT - Spectrum AnaLysis SATellite

Artistic Impression of SALSAT during an overflight in the low earth orbit
Lupe [1]

   

Launch & LEOP Information

Current schedule:

  • 2020-09-28 11:20:32 UTC Launch at Plesetsk Cosmodrome
  • 2020-09-28 14:46:12 UTC Separation
  • 2020-09-28 23:11:37 UTC First contact (callsign DP0WER)

The following Links can be used for further updates/information about the project and launch:

  • Updated Website: TU Homepage [2]
  • Social Media: Follow TUBSpace [3] and SALSAT [4] on Twitter!
  • Documents: Amateur Radio Informations [5]
  • Youtube Trailer: English [6] / Deutsch [7]
  • Youtube Interview: TU Interview [8]
SALSAT Team Members in front of the S band antenna of TU Berlin's groundstation
Lupe [9]
SALSAT Team Members at the Integration Facility in September 2020
Lupe [10]

The Mission

The research project SALSAT (Spectrum AnaLysis SATellite) develops, launches and operates a nanosatellite with a payload for in-orbit spectrum analysis. The primary payload is the spectrum-analyzer SALSA [11], which has been developed and space-qualified within the recent research activities of the chair of space technology. SALSAT is based on the TUBiX10 satellite bus which has been developed at the Technische Universität (TU) Berlin. An existing flight spare satellite of the S-Net [12] mission is utilized and modified to accommodate the specific needs of the SALSAT mission. The primary focus of the project consists of the design of Hard- and Software components as well as the operation of SALSAT in orbit. Scientific data for the analysis of the global spectrum use is gathered and processed throughout the mission lifetime. The data is used to generate heatmaps of the global spectrum use as well as to detect harmful interference. Study groups of the ITU for spectrum analysis for small satellites are also accompanied in the scope of the SALSAT mission.

The payloads

The SALSAT mission consists of the primary payload SALSA [13], which is a spectrum analyzer for the analysis of the spectrum utilization from the low earth orbit. SALSA solely analyzes the portion of the spectrum which is utilized for satellite communication (e.g. amateur radio bands). The following frequency bands will be analayzed:

  • VHF: 145.80 – 174.00 MHz
  • UHF: 400.15 – 420.00 MHz
            435.00 – 438.00 MHz
  • S band: 2 075.00 – 2 095.00 MHz
                 2 255.00 – 2 275.00 MHz

The spectrum utilization will be collected and analyzed within these frequencies. As a result a global heatmap of the spectrum utilization over time and location will be generated.

The SALSAT mission will also feature multiple secondary payloads:

  • Laser-Retroreflectors for ground-based high accuracy orbit determination
  • Optical paylaoad for verification of the attitude control system of SALSAT
  • Novel Fluiddynamic Actuator (FDA [14]) for attitude control of nanosatellites
  • Modified S-Link RF transceiver for full-duplex communication in the S band
SALSAT satellite overview
Lupe [15]

Amateur Radio

SALSAT is a Spectrum AnaLysis SATellite. The main objective is an analysis of the actual used (amateur & scientific) spectrum to obtain a better understanding of the current challenges of frequency coordination. The Amateur spectrum data will be made available to the interested public. Space research payload data will be requested and downlinked in space research service bands. SALSAT does not include any commercial mission and does not use amateur bands for non-amateur services.

Detailed Information on how-to contact SALSAT (e.g. telemetry formats) can be found on the amateur radio website [16] of the chair.

The spectrum data in the amateur radio bands collected over the course of the mission will be published in a online database (s/t the MarconISStadatabase [17]). Detailed information will be published during the operational phase of SALSAT in 2021.

The reason for not using amateur-satellite bands in S band is that the transceiver has a proprietary
protocol that is not published by the manufacturer (IQWireless). Most of the spectrum data will be downlinked via this COM system. The S band transceiver has both uplink and downlink functionalities and is therefore independent from the UHF COM system.

Within several hands-on classes and projects TU Berlin uses Amateur UHF to teach satellite operations and communication technology. Currently these courses are:
- Amateur Radio Novice and Advanced Class
- Spaceflight Planning and Operations,
- Project Satellite Operations,
- Project Amateur Radio,
- Project Satellite Communications

Through these courses, we so far helped ~40 radio amateurs to obtain their license.
Nominal TT&C of the satellite and amateur payloads will be conducted in amateur-satellite bands.

The SALSAT Team

SALSAT (Spectrum AnaLysis SATellite) project team
project lead
Jens Großhans, M.Sc. [18]
systems engineer
Dipl.-Ing. Huu Quan Vu [19]
software engineer
Philipp Wüstenberg, M.Sc. [20]
electronics engineer
Michael Pust, M.Sc. [21]
communications engineer
Sebastian Lange, M.Sc. [22]
student assistant
Alexander Balke, B.Eng. [23]
student assistant
Thee Vanichangkul, B.Eng. [24]
SALSAT Team 2020
Lupe [25]

Preparatory research projects

As previously mentioned the SALSAT project conducts in-orbit spectrum analysis in defined RF bands. The chair of space technology at the TU Berlin conducted preparatory work within the scope of two completed research projects (REPIN [26]and SALSA [27]). These projects established the theoretical and practical foundation for the SALSAT mission. The utilized satellite bus (TUBiX10) has been developed and space qualified within the S-Net [28] project. This project also utilizes the SLink [29] RF transceiver. The secondary payload for attitude control is developed, qualified and manufactured within the FDA [30] project.

Technical Parameter

This paragraph contains the main technical parameters of SALSAT. It shall be mentioned that the exact parameter evolve during the development process. The table below represents the technical specifications at the stage of the Flight Readiness Review (FRR) in July 2020.

SALSAT: Technical Paramet
Parameter
Value
Orbit
575 km (SSO)
Launch Date
September 28th 2020
Design Lifetime
>1 year
Mass
~ 11.00 kg 
Volume
240 x 240 x 240 mm³
Communication
UHF (TM/TC), S band (UL/DL of payload data)
Attitude Control
3-axis control with MEMS sensors, magnetorquers and reaction wheels
Payload
Spectrumanalyzer (SALSA), optical camera, 3-axis Fluid-Dynamic Actuation system (FDA), Linux based processing system (IPU), S-band transceiver (SLINK) and Laser reflectors
Lupe [31]
Lupe [32]
Lupe [33]

   

Publications

<< previous [34]
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Martin Buscher, Max Kramer, Robert Marx, Alex Sullivan, Brian Treacy, Klaus Brieß (2019). Flight Results of MarconISSta: Monitoring and Analysis of Radio Frequency Use from Low Earth Orbit [51]. 12th IAA Symposium on Small Satellites for Earth Observation


M. Schiemangk, K. Lampmann, A. Dinkelaker, A. Kohfeldt, M. Krutzik, Ch. Kürbis A. Sahm, St. Spießb erger, A. Wicht, G. Erbert, G. Tränkle, A Peters (2015). High power, micro-integrated diode laser modules at 767 and 780 nm for portable quantum gas experiments [52]. Applied Optics, 5332.


M. Lezius, T. Wilken, Ch. Deutsch, M. Giunta, O. Mandel, A. Thaller, V. Schkolnik, M. Schiemangk, A. Dinkelaker, M. Krutzik, A. Kohfeldt, A. Wicht, A. Peters, O. Hellmig, H. Duncker, K. Sengstock, P. Windpassinger, K. Lampmann, T. Hülsing, T. Hänsch, R. Holzwarth (2016). Space-born Frequency Comb Metrology [53]. Optica, 1381.


Léglise, Julius; Nitschke, Tony; Balke, Alexander; Stamm, Jakob and Adirim, Harry (2017). Launch Campaign of the DECAN Lower Stage and Development Progress of a 3D-Printed Experimental Rocket at TU Berlin [54]. 66. Deutscher Luft- und Raumfahrtkongress


Lim, Yeerang and Yoon, Zizung and Frese, Walter (2019). in-orbit differential drag control experiment on nanosatellite cluster: analysis and flight results [55]. 12th IAA Symposium on small satellites for Earth observation


Lennart Kryza; Philipp Wüstenberg, Thomas Meschede, Tobias Funke, Klaus Brieß (2017). Development of Software for Space Applications based on ROS and ROS2 [56]. 68th International Astronautical Congress (IAC)


Kühn, Jakob; Barschke, Merlin F. and Költzsch, Danilo (2017). Development of a thermal simulation tool for nanosatellites based on commercial Finite Element Analysis software [57]. Proceedings of the 11th IAA Symposium on Small Satellites for Earth Observation, 385-388.


Költzsch, Danilo and Barschke, Merlin F. (2014). Development and verification of a lightweight and modular structure for a novel nanosatellite platform [58]. Proceedings of the 63th German Aerospace Congress


Költzsch, Danilo and Barschke, Merlin F. (2017). Finite Element Analysis aided structure design for a modular nanosatellite platform [59]. Proceedings of the 11th IAA Symposium on Small Satellites for Earth Observation, 351-354.


Tym Pakulski; Alexander Linossier; Lennart Kryza (2018). Design of a Cost Effecive Robotic Manipulator for an Educational Mars Analogue Rover [60]. 2nd Symposium on Space Educational Activities


Konaka, Mina; Haces Crespo, Juan M.; Bartholomäus, Julian; Dinkelaker, Aline N.; Bawamia, Ahmad; Krutzik and Markus and Barschke, Merlin F. (2019). Preliminary thermal design for the small satellite mission QUEEN, carrying an optical atomic frequency reference [61]. Proceedings of the 9th Nano-Satellite Symposium


Klaus Brieß, Frank Baumann and SebastianTrowitzsch (2011). Present and Future Picosatellite Missions at TU Berlin [62]. 8th IAA Symposium Small Satellites for Earth Observation


Kirchner, Georg; Grunwaldt, Ludwig; Neubert, Reinhard; Koidl, Franz; Barschke, Merlin; Yoon, Zizung and Fiedler, Hauke (2013). Laser ranging to nano-satellites in LEO orbits: Plans, issues, simulations [63]. Proceedings of the 18th International Workshop on Laser Ranging


Junk, Stefan; Lehmann, Marc; Barschke, Merlin F. and Rotter, Sven (2017). Lean hardware update process for a modular satellite platform [64]. Proceedings of the 68th International Astronautical Congress


Ivanov, Danil; Penkov, Vladimir; Ovchinnikov, Michael Yu.; Barschke, Merlin F.; Brieß, Klaus and Kypriyanova, Nadezhda (2014). Characterisation of hysteretic dampers for passive attitude control of CubeSats [65]. presentation at the 6th European CubeSat Symposium


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Fachgebietsleitung

Prof. Dr.-Ing. Enrico Stoll
Tel. +49 30 314-21339
Room F 515
e-mail query [80]

Grant No.:

50 YB 1805

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