IoT-Enabled Nanosatellite Constellation for Environmental Sensing and Flood Risk Monitoring Along the River Niger: A Case Study of Lokoja, Kogi State

The confluence of the River Niger and River Benue at Lokoja, Kogi State, is a critical hydrological node in West Africa, historically prone to catastrophic flooding. Traditional flood monitoring systems in Nigeria rely on sparse terrestrial gauges and infrequent Earth Observation (EO) satellite passes, leading to high-latency data and delayed early warning signals. This paper proposes a technically robust, low-cost architectural framework integrating a 3U CubeSat/nanosatellite constellation with a terrestrial Internet of Things (IoT) sensor network to achieve real-time environmental sensing and flood risk monitoring. Operating in a 550 km Sun-Synchronous Orbit (SSO), the proposed 6-satellite constellation interfaces directly with ground-based LoRaWAN-enabled water level, soil moisture, and meteorological sensors via Direct-to-Satellite IoT (DtS-IoT) links operating in the UHF/Sband. The study details the complete system architecture which encompasses the space segment, payload, IoT, communications, and ground segments. Rigorous engineering analyses, including orbital mechanics, coverage geometry, link budgets, and power budgets are also detailed. Results indicate that the constellation achieves a temporal resolution (revisit time) of under 4 hours, compared to the 2–3 days typical of legacy systems like NigeriaSat-2. With an expected IoT uplink margin of +8.4 dB and a sustainable solar power budget allowing continuous sensor polling, this architecture presents a scalable, indigenous solution aligned with the National Space Research and Development Agency (NASRDA) mandate for disaster mitigation and national security.