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BD SAT to space

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This project is implemented with financial support from the state budget through the Ministry of Industry and Trade.

BDSAT:
Nanosatellite supporting the world radio amateur community

BDSAT project aims to support the radio amateur community with several HAM services and activities. Secondary goal is a verification of a prototype of pressure measuring equipment and to verify the functionality of this technology in open space conditions. The function of the measurement itself, its feasibility and suitability for use in satellites in space conditions will be verified. The second part of the technological experiment is to verify use of supercapacitors as a modern approach to energy storage in satellites.

BDSAT is a satellite built for radio amateurs. Creators and supporters of BDSat project have great passion for space radio amateur activities and are already involved in two radio amateur mission from the region, skCUBE and GRBAlpha. Both of them very successful and popular in the community.

Nanosatellite
so-called the Cubesat

BDSAT is the nanosatellite, so-called the Cubesat, sized 10x10x10 cm. Nanosatellite space technology is a major technological trend.

Despite their small size and weight, Cubesats are taking over some roles of the larger satellites as it is a low-cost option for developing and testing new technologies in space.

The BDSAT project is divided into two parts. First at all, it will test BD SENSORS pressure transmitters in open space conditions. These transmitters have to meet very demanding requirements both in terms of survival in harsh space conditions and in terms of maintaining accuracy and other technical parameters. The reliability of the technology is essential to the future space applications.

A base station for communication with the satellite will be located at the co-investigator CEITEC VUT, which will provide the command and data collection from the satellite.

The experiment also includes verifying the function of the supercapacitor bank. It is a powerful source for storing electricity for satellite systems. In the future, a supercapacitor bank can replace conventional battery power systems. The system will be charged with energy from solar panels during the flight phase facing the Sun. During the second phase of the flight without the power from the solar panels, the energy from this source will be discharged to an artificial load.

After launching the nanosatellite into an orbit, regular monitoring and data collection will take place to check the proper functioning of the pressure sensor and the supercapacitor´s bank, their temperature dependence, and degradation influenced by the time and radiation.

The supercapacitor’s bank will also be assessed for the ability to maintain energy in space. In addition to data from verification experiments, operational data of nanosatellite will be monitored.

Printed circuit boards for the Engineering model (EM) are currently being installed. On this model of the BDSAT cubesat, all the functionality of the proposed satellite concept will be tested. In this phase of development, we are able to detect possible errors before building your own satellite flying into the universe.

EM is built according to the same procedures as the resulting flight model (so-called Flight model – FM), but it is not intended to be launched into space. This model serves only as a training unit, which is used for testing, for example, the assembly of individual components into the final unit, the functionality of HW and many other things that are better to be tested just before launching an expensive flight model. It will also be very important to test the software of the on-board computer controlling and coordinating all satellite activity.

For radio-amateurs

HAM services provided by BDSAT:

 

  • 25 telemetry
  • CW beacon
  • Digipeater
  • Anniversary/special occasions AX.25 & CW messages for community engagement
  • SATNOGS integration, decoder, dashboard
  • Special set of (one purpose, not command and control) AX.25 commands allowing radio amateur community to actively communicate with the satellite and receive telemetry data.

 

We would like to express our gratitude to the Czech Telecommunication Office and International Amateur Radio Union for making this mission possible.

 

The satellite carries a set of two Murgas transceivers from Spacemanic.

 

Basic information for satellite reception:

 

Callsign: TBD

Downlink frequency: TBD MHz +/- Doppler shift

Modulation: GFSK, CW

Encoding: G3RUH 9k6 bd

Protocol: AX.25

Transmitting power: 1 W (30dBm)

Default AX.25 telemetric packet interval: 30 s

Default morse interval: 90 s

Onboard antenna: Dipole

Antenna polarization: Linear

 

Recommended TNC modem setup:

 

PACLEN 255

TXDELAY 15

MYCALL [Your call sign]

UNPROTO CQ (or callsign)

 

Orbital parameters / Preliminary TLE

 

500km SSO, 11:00 LTDN

TBC