As soon as 19th November 2018 launch of 4. polish satellite – PW-Sat2 – is scheduled. It’s primary mission is a technological tests of sail-based deorbit system. The PW-Sat2 is one of the payloads in SpaceFlight SSO-A The SmallSat Express mission aboard SpaceX’s Falcon 9 rocket. Please be advised that planned launch date may change since it’s quite common for orbital rockets launches – be prepared and follow our socials!
The satellite is equipped with full duplex communication module TRxVU Rev. B from Innovative Solutions in Space BV. It operates in amateur bands UHF (downlink) and VHF (uplink). Antenna module consists of two dipole antenna (for uplink/downlink) with linear polarisation. Downlink power equals to 27 dBm (0.5 W). Downlink signal utilizes BPSK modulation, data scrambling according to G3RUH and AX.25 protocol. By default, the satellite transmits its downlink signal at 1200 bps, however it might be changed on request by the OPERation team (via uplink telecommand) up to 9600 bps. Currently set bitrate will be published on PW-Sat2’s Twitter profile, however determination of actual bitrate should be fairly easy by looking at signal spectrum.
What data will be transmitted?
Every 60 seconds the satellite transmits a beacon frame full of telemetric data. 229-bytes long payload of the beacon frame contains the most important information about satellite’s state – among others – temperatures of main subsystems, battery voltage, solar power, on-board computer mission time and experiments state. Other data, such as historical telemetry, experiments data, photos from cameras will be send on request from PW-Sat2’s OPERation team. There is one exception from this rule – deorbit sail experiment will transmit its results on-line (since after sail deployment random tumbling is expected to occur resulting in signal loses and solar energy decrease). Downlink signal of PW-Sat2 will be opened for everyone to receive, decode and interpret data!
HAM radio tools to receive PW-Sat2
HAM radio community plays important role in almost every cubesat mission – receiving and sharing acquired signal with satellites’ owners. Our team has prepared set of tools helping in receiving and demodulation of PW-Sat2 radio signal and upload to cloud-based service afterwards. We believe that data shared to us by community will have big impact on our mission.