D-Star ONE Sparrow
| D-Star ONE Sparrow | |
|---|---|
| Type: | Demonstration satellite , amateur radio satellite |
| Country: |
 Germany
|
| Operator: | German Orbital Systems GmbH |
| COSPAR-ID : | 2018-111-F |
| Mission dates | |
| Dimensions: | 4 kg |
| Size: | 30 cm × 10 cm × 10 cm |
| Begin: | December 27, 2018 02:07 UTC |
| Starting place: | Vostochny Cosmodrome |
| Launcher: | Soyuz-2-1a Fregat-M |
| Status: | active |
| Orbit data | |
| Rotation time : | 96.2 min |
| Apogee height : | 594.5 km |
| Perigee height : | 577.4 km |
D-Star ONE Sparrow is a German nanosatellite that was designed and built by the Berlin company German Orbital Systems GmbH. D-Star ONE is the first private German CubeSat, the first German D-STAR - communications satellite . After TabletSat-Aurora and OUFTI-1, it is now the third satellite worldwide with this transmission standard . The launch was the third attempt to place this project in orbit, as a false launch on November 28, 2017 resulted in a total loss. A replacement satellite could be set up in just 44 days, launched on February 1, 2018 and named D-Star ONE v.1.1 Phoenix (2018-014J). However, Phoenix could not be put into operation.
construction
D-Star-ONE Sparrow was developed and built by the Berlin company German Orbital Systems GmbH in cooperation with the Czech company iSky Technology sro as a demonstration project. D-Star One is equipped with four identical D-Star radio modules, all of which are operated in half-duplex mode. Two modules are used for control and telemetry and operate on identical frequencies. Both modules can send and receive. To avoid loss of information, they answer one by one. Therefore, each telemetry set is repeated twice. Both modules have a D-Star voice message, which is only activated for a module during LEOP . The beacon message is repeated every minute. The other two modules are used for amateur radio services via satellites . Both modules use the same frequencies, ie one module is switched off as long as the other does not show any degradation effects. Half-duplex mode is also used here. The modules are configured to work as D-Star repeaters by transmitting the received D-Star frames on the downlink frequency.
mission
D-Star ONE Sparrow was launched on December 27, 2018 together with the main payload, the Kanopus-V-5 and -6 satellites and a further 25 small satellites, including D-Star ONE iSat , UWE-4 and ZACube-2 with a Soyuz-2 -1a Fregat-M launched from the Russian cosmodrome Vostochny . The first telemetry was received on December 29, 2018 by Mike Rupprecht, DK3WN. The first connections were reported by Wladimir Chornej, EU1SAT and Scott Chapman, K4KDR.
Frequencies
- Uplink: 437.325 MHz (D-Star)
- Downlink: 435.525 MHz (D-Star, transmission power 800 mW… 1200 mW)
- Telemetry: 435.700 MHz 4k8 GMSK Mobitex (CMX990 Mobitex format)
- Call Sign: DP1GOS
The use of the amateur radio frequencies was not coordinated with the IARU .
Web links
Individual evidence
- ↑ Ciprian Sufitchi: D-STAR ONE SPARROW. January 12, 2019, accessed January 13, 2019 .