QUBOID QX-26 CubeSat with Radiation Bioindicator Payload (RIBFE)
A student-built 2U CubeSat integrating ionospheric plasma research with a radiation-sensitive bioindicator film experiment for real-time space environment analysis.
The QUBOID QX-26 mission represents a comprehensive student-driven effort to design, develop, and deploy a scientifically capable CubeSat platform. Built in a 2U form factor, the satellite is engineered to perform dual-domain research by combining physical plasma measurements with biochemical response analysis.
At its core, the Multineedle Langmuir Probe (mNLP) measures electron density, plasma temperature, and ionospheric irregularities by sweeping voltages across multiple electrodes and analyzing current responses. This enables high-resolution insight into space weather conditions, orbital drag effects, and atmospheric behavior.
Complementing this, the Radiation-Induced Bioindicator Film Experiment (RIBFE) introduces a novel chemical sensing approach. A sealed bioindicator film undergoes controlled color changes when exposed to ionizing radiation, oxidative stress, and thermal cycling. An onboard optical system—consisting of an LED and photodiode—quantifies these changes, allowing precise monitoring of environmental stress factors in orbit.
The CubeSat’s subsystem architecture includes:
A STM32-based On-Board Computer (OBC) for data processing and control
Electrical Power System (EPS) with solar panels, battery pack, and regulated outputs
Attitude Determination and Control System (ADCS) with IMU and magnetorquers
Communication system using UHF/VHF with AX.25 protocol
GPS module and deployable antenna system
The RIBFE payload is fully sealed, lightweight (<1 g), consumes minimal power, and complies with safety regulations by avoiding biological organisms or hazardous materials. It integrates seamlessly without interfering with primary systems.
This mission not only advances research in ionospheric science and radiation chemistry but also establishes a strong foundation for open-source satellite development. It demonstrates how student-led teams can contribute to national space capabilities, scientific collaboration, and future aerospace innovation.