IARU Amateur Satellite Frequency Coordination
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IARU Amateur Satellite Frequency Coordination |
| Slipper2sSat-2 | Updated: 21 Jun 2026 | Responsible Operator | Sajan Duwal 9N2SJ | |
| Supporting Organisation | Antarikchya Pratisthan Nepal | |||
| Contact Person | sajan@antarikchya.org.np.nospam | |||
| Headline Details: A 1U CubeSat, Slippers2Sat-2 is designed as a disaster assessment and management satellite focused on Earth observation and environmental prediction. In addition to its primary mission, it will host an amateur radio payload functioning as an orbital digital repeater (digipeater). This will allow amateur radio operators to uplink standard AX.25 data packets to the satellite. The onboard system will interpret the received packet and, if it contains the correct routing command, automatically digipeat the message back down to Earth for reception by amateur radio operators worldwide. The satellite features an Active Attitude Determination and Control System (ADCS) utilizing magnetic torquers (magnetorquers) to ensure stability of the satellite.The primary disaster assessment and management payload on Slippers2Sat-2 consists of an array of four PNI RM3100 magnetometer sensors. This payload is designed to detect fluctuations in Earth's magnetic field to help predict changes in earthquake precursor signals. The satellite will periodically downlink these measured magnetic variations to Earth using amateur-frequencies. Amateur radio operators, students and researchers will be encouraged to actively receive and decode the transmitted data. Participants may upload their received datasets to the project website where the information will be combined and made available for further analysis. The amateur radio community will be invited to participate in earthquake precursor research, data interpretation activities. For Earth observation missions, Slippers2Sat-2 features a camera payload consisting of both Near-Infrared (NIR) and RGB sensors. These cameras capture imagery of the Earth's surface to calculate and analyze the Normalized Difference Water Index (NDWI). This data helps researchers evaluate changes in surface water distribution and manage regional water resources during disaster scenarios. To maximize efficiency, an onboard Artificial Intelligence (AI) algorithm automatically evaluates and filters out BAD images obscured by heavy cloud cover, glare, or poor exposure while preserving GOOD high-quality images. Selected GOOD images will be broadcast continuously for approximately 24 hours through the amateur radio downlink, enabling amateur radio operators around the world to receive image data, reconstruct complete images and contribute to mission operations. Amateur operators will be encouraged to upload received images and raw IQ recordings to the project's website. The project will also organize community competitions and recognition programs for operators who successfully reconstruct complete images, contribute significant volumes of received data, or demonstrate innovative image processing and decoding techniques using the openly transmitted satellite data. To ensure complete transparency and regulatory compliance, the team will publish all resources, including the GMSK telemetry framing specifications, public software decoding tools, and technical documentation on an open-source platform before launch. This will allow any amateur operator with standard ground-station equipment to freely capture, decode, and use all mission and payload data. The mission is intended to promote education, experimentation, international collaboration, and active participation within the amateur radio community. Proposing a UHF downlink using 4k8 GMSK and 20 wpm CW. Planning a Exolaunch deployment from a Falcon 9 from Vandenberg mid to late 2027 into LEO Sun synocronous orbit. Please find more info about the project at: https://s2s2.antarikchya.org.np/ | ||||
| Application Date: | 16 Jun 2026 | Freq coordination completed on | ||
The IARU Amateur Satellite Frequency Coordination Status pages are hosted
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