- 2019.05.09: More results on IAA SSEO .
- 2019.02.01: One year in orbit. All satellites in best state! Relative distances great!
- 2018.10.02: Flight results on IAC Bremen .
- S-Band down- and uplink successful.
- Info for radio amateur: Mike Rupprecht 
- 2018.02.22: Intersatellite communication successful.
- 2018.02.19: SLink has been activated. S-band downlink is next step.
- 2018.02.07: TLEs: 43186, 43187, 43188, 43189. Relative distance stable.
- 2018.02.01: Ground contact w. all four S-NET was established.
- 2018.02.01: Successful launch of four S-NET satellites with Soyuz/Fregat.
The objective of the S-Net mission is to investigate and demonstrate the inter-satellite communication technology within a distributed an autonomously operating nanosatellite network. As space born systems have become an essential element in facing global challenges such as climate change, disaster management and maritime systems monitoring, rapid response and low cost systems are in high demand.
A key technology to increase the operational efficiency of distributed satellite systems via formations or even autonomous swarms is the miniaturizing of intersatellite communication technology. In cooperation with IQ wireless GmbH, TU Berlin developed an S-band transceiver (SLink)  with 100 kbps crosslink and 1 Mbps downlink capability suitable for accommodation in nanosatellites.
|Mission Objectives||S-band inter
satellite communication with nanosatellites|
|Satellite number||4 (Norad ID:
Height||580 km SSO|
|Launch Date||2018.02.01 02:07
|Mass||8.72 kg |
|Volume||240 x 240 x 240
|Communication||UHF (TM/TC), S-band
Control||3-axis control w. MEMS sensors, magnetorquers and
(SLINK) for ISL and up/downlink Laser reflector for high precision
Short docu about mission TV1:
The mission (image video):
Encapsulation of Fregat upper stage at cosmodrome Vostochny:
Report (successful launch and first contact):
|Author||Yoon, Zizung and Frese, Walter and Bukmaier, Alexander and Briess, Klaus|
|Journal||CEAS Space Journal|
|Abstract||The paper presents the mission and system design of the S-Net mission, which consists of four nanosatellites to demonstrate intersatellite communication in S-band. The goal is to demonstrate multipoint to multipoint communication with high data rates and optimized communication protocols to push further the technological boundary of nanosatellites. To overcome the cross-communication limitations of a nanosatellite, the Technical University of Berlin developed an S-band (2.0-2.3 GHz) transceiver with 100 kbps crosslink and 1 Mbps downlink capability suitable for nanosatellites. Modern transmission techniques such as Adaptive Modulation and Coding (AMC) with Turbo and convolutional coding and up to APSK8 were implemented and tested on ground. The transceiver accommodates the physical layer and data link layer while the satellite controller is responsible for the network layer. Each nanosatellite will be equipped with the above mentioned S-band transceiver. Hence a mission analysis as well as the design overview of the space segment and ground segment will be described. Different network architecture and corresponding routing algorithm will be demonstrated and verified within the mission.|
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