This project is implemented with financial support from the state budget through the Ministry of Industry and Trade in TRIO program.
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.
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.
The satellite carries a set of two Murgas transceivers from Spacemanic.
MYCALL [Your call sign]
UNPROTO CQ (or callsign)
Orbit: 500km SSO, 11:00 LTDN
BDSat 1 12345U 22999A 22091.73697910 .00000000 00000-0 00000-0 0 00005 2 12345 97.4200 174.2485 0018409 214.8262 199.3703 15.24239762000000
Satnogs DB Link: SatNOGS DB – BDSat
Satnogs Network Observations: SatNOGS Network – Observations
Satnogs Dashboard: Satellite Telemetries – Grafana (satnogs.org)
The packet and CW transmission intervals are following:
There are offsets applied between transmissions.
Data in AX.25 TRX beacon packet values are comma-separated.
1:Fm OK0BDS To CQ [02:32:31R] [AA] [+++++++] 3511,326016,126,2904,3227,3143,0,,4,1075,135,207
1:Fm OK0BDS To CQ [02:32:36R] [AA] [++++++-] 3516,326021,126,2904,3227,3118,0,,4,1077,133,207
1:Fm OK0BDS To CQ [02:32:56R] [AA] [+++++++] 3536,326041,126,2916,3227,3168,1,OM9SAT,5,1079,138,207
Note: [0.01C] means e.g. -1234 -> -12.34C
OBC packet is created by Spacemanic Eddie Onboard Computer including selected interesting values from BDSat onboard subsystems. Values are comma-separated.
1:Fm OK0BDS To CQ [13:10:39R] [AA] [+++++++] OBC,9,1159,8303,2507,2143,2131,2213,2018,1968,3987,-1,-1,00,73020,9555
1:Fm OK0BDS To CQ [02:32:33R] [AA] [+++++++] BDSAT AX.25 test message for radio amateurs: Hello Space!
According to radio amateur standards, every CW beacon (no matter if data or message beacon) starts with
"DE ok0bds = " and ends with
de ok0bds = u5433r126t29p30 ar
u5433 = Uptime 5433 minutes
r126 = 126 resets of downlink radio
t29 = 29 degree of Celsius on DL radio MCU
p30 = 30 degree of Celsium on DL radio PA
de ok0bds = morse test from earth ar