The technical details of RIMS (Ranging and Integrity Monitoring Stations) within the context of the European Geostationary Navigation Overlay System (EGNOS).
- Overview of EGNOS RIMS:
- EGNOS is the European Satellite-Based Augmentation System (SBAS) that enhances the accuracy and reliability of GPS and GLONASS signals.
- The EGNOS ground segment includes RIMS, which play a crucial role in driving system performance alongside the Central Processing Facility (CPF).
- RIMS are strategically located across Europe and surrounding continents, primarily in secured areas such as airports and telecommunication space centers.
- Each RIMS site comprises 2 to 3 independent channels (A/B or A/B/C), depending on whether channel C is installed.
- Channels A and B form measurement chains, with one channel providing raw data for differential corrections computation (feeding the CPF), and the other channel serving the CPF check chain for comparison and integrity monitoring purposes.
- To prevent common failures, Channels A and B are diversified in design and built by different manufacturers.
- Technical Design of EGNOS RIMS:
- Measurement Channels: Each RIMS site has independent measurement channels (A/B or A/B/C). These channels consist of their own antennas and receivers.
- Raw Data Streams: RIMS send raw data streams to the CPF, which includes time-tagged observations. These data are used for differential corrections and integrity monitoring.
- Receiver Components: The receiver components within RIMS include:
- Antenna: Captures satellite signals.
- RF Parts: Process the received signals.
- Signal Processing Unit: Extracts relevant information from the signals.
- Other Equipment:
- Atomic Clocks: Provide precise timing information.
- RIMS Core Computer: Manages data processing and communication.
- Role of RIMS:
- Integrity Monitoring: RIMS play a critical role in detecting anomalies in satellite signals. If a satellite signal deviates from expected behavior, RIMS contribute to the integrity monitoring process.
- System Performance: Together with the CPF, RIMS significantly impact the overall performance of EGNOS.
