PolaRxS is a multi-frequency multi-constellation receiver dedicated to ionospheric monitoring and space weather applications. Designed around a state-of-the-art ultra low noise Oven-Controlled Crystal Oscillator (OCXO) and Septentrio’s latest multi-frequency tracking engine, PolaRxS provides unbeaten measurement noise level while featuring proven simultaneous high-quality GPS, GLONASS and Galileo tracking next to a range of innovative features such as AIM+, adaptive interference analysis and mitigation, APME+, advanced multipath mitigation or LOCK+ for exceptional sensitivity and tracking stability under high dynamic conditions. Post-correlation phase and signal intensity are made available at up to 100Hz for direct use or post-processed by the provided graphical user interface to derive and log TEC and scintillation indices.