Remote environmental sensors with satellite backup in areas without terrestrial coverage
Environmental monitoring in settings without reliable terrestrial communications infrastructure presents a set of technical requirements that condition both system design and its continued operation. In these deployments, the sensor node must operate autonomously for extended periods, manage the capture of physical parameters — temperature, humidity, pressure, flow rate, water quality or atmospheric composition, among others — and guarantee data integrity prior to transmission. The absence of a terrestrial network makes the satellite link the only viable return path, which imposes constraints on transmission frequency, data volume per session and admissible latency depending on the type of satellite service available. From an energy standpoint, node autonomy is a determining factor. Systems deployed in remote field conditions typically rely on local generation sources — solar photovoltaic with battery storage — whose capacity must be sized according to the consumption of the sensor, the onboard processing module and the satellite transceiver. Management of the transmission cycle — activity windows, low-power modes and local storage protocols in the event of link loss — forms part of the functional design of the system and cannot be treated as a secondary element. A failure in energy management directly compromises data continuity and, by extension, the validity of the time series that underpin operational decision-making. Data quality at source constitutes another critical technical axis. Periodic sensor calibration, detection of anomalous readings via onboard logic and precise time-stamping — typically referenced to GNSS — are requirements that must be addressed in the design from the engineering phase. The gradual degradation of an uncalibrated sensor can introduce systematic drifts that invalidate data series without the operator detecting this immediately. In mission-critical contexts, such as the monitoring of hydraulic infrastructure or the monitoring of geotechnical parameters in risk zones, this degradation has direct operational consequences. Maintaining these systems in remote field conditions represents a significant operational cost that must be integrated into the lifecycle assessment. Physical access to the node may be constrained by seasonal, logistical or security factors, which requires designing architectures with remote diagnostic capability, firmware updates via satellite link and functional redundancy in critical components. The selection of satellite service type — whether via low or medium orbit constellations, or via HAPS platforms in certain scenarios — must be evaluated according to available coverage, link latency and the bandwidth requirements of the monitoring system, without any of these factors being analysable in isolation.
NASSAT - Network Satellite Systems