Satellite ADS-B Receiving Units for Global Air Traffic Monitoring
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Solution Overview
Problem
Current air traffic monitoring systems face limitations in providing uninterrupted and cost-effective global coverage due to the reliance on expensive relay satellites and the limited range of ground stations, which results in gaps in surveillance, especially over oceans and remote areas.
Innovation Solution
Integration of receiving units into a satellite communication network using a common communication protocol to transmit ADS-B messages from aircraft to ground stations, eliminating the need for relay satellites and ensuring real-time data transmission through overlapping reception areas, with directional antennas and adaptive directivity to manage signal collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay satellites are used to extend ADS-B signal range, then global coverage is improved, but system cost increases significantly
Solution Approach 1:
The patent integrates ADS-B receiving units into existing multi-functional satellites that already provide communication or Earth observation services. This allows the same satellite infrastructure to serve multiple purposes - its original function plus air traffic surveillance - thereby achieving global coverage without deploying dedicated relay satellites, thus avoiding the high costs associated with building and operating specialized satellite constellations.
Solution Approach 2:
The patent leverages the inherent capabilities of existing satellites to perform dual functions. Rather than requiring separate dedicated infrastructure for ADS-B reception, the system utilizes the existing satellite platforms' power, communication channels, and orbital positions to simultaneously provide their primary service and air traffic monitoring, making the system self-sufficient and cost-effective.
2Reliability
If ground stations are deployed densely to ensure continuous monitoring, then monitoring reliability is improved, but deployment cost and complexity increase
Solution Approach 1:
The patent transitions the surveillance architecture from a two-dimensional ground-based network to a three-dimensional space-based system. By deploying receiving units on satellites orbiting at altitudes of 500-2000 km, the system achieves global coverage with far fewer nodes compared to a dense ground station network, thereby improving reliability while reducing overall system complexity.
Solution Approach 2:
The patent divides the monitoring function into segments distributed across multiple satellites in different orbital positions. Each satellite independently provides coverage for its specific orbital zone, and the collective network ensures continuous global monitoring. This segmentation approach replaces the need for a densely interconnected ground station network with a more manageable satellite-based distributed system.
3Speed
If satellites are placed in low Earth orbit, then signal transmission speed is improved, but orbital lifetime decreases due to atmospheric drag
Solution Approach 1:
The patent selects an optimal orbital altitude range of 500-2000 km that balances two competing parameters: signal transmission speed and orbital lifetime. At this altitude, the satellites maintain sufficiently low orbit for fast signal transmission while experiencing reduced atmospheric drag compared to lower orbits, thereby extending operational lifetime. The system may also incorporate periodic orbital boosting maneuvers to counteract atmospheric drag and maintain the optimal altitude range throughout the satellite's operational life.
Data Source
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AI summary
The invention relates to a monitoring system for the air-traffic control of flight objects (5, 6), which have transmitting units for emitting air-traffic control radio signals (ADS-B), wherein the air-traffic control radio signals (ADS-B) containing flight data concerning the respective aircraft (5, 6), the monitoring system comprising a plurality of receiving units (4a to 4c), which are designed to receive the emitted air-traffic control radio signals, wherein a plurality of satellites (1a to 1c) are provided, which each have communication means for forming a common satellite communication network and on each of which at least one of the receiving units (4a to 4c) is arranged, wherein the receiving units (4a to 4c) are connected to the communication means of the respective satellite (1a to 1c) and are designed to transmit the flight data contained in the air-traffic control radio signals to at least one ground station (3, 7) having a communication connection to the satellite communication network using a common communication protocol of the satellite communication network.