Space-Born Maritime Receivers for Global DSC Coverage
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Solution Overview
Problem
Current Digital Selective Calling (DSC) systems lack coverage in polar regions and beyond the range of coastal regions, making distress communications unreliable for vessels in these areas.
Innovation Solution
A satellite constellation with Space-Born Maritime receivers is deployed to collect and process DSC emergency messages, providing global coverage by assigning geolocation and time location data, and cross-correlating with AIS data to achieve precise positioning and deliver messages to authorities, even without GPS equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DSC systems are used, then distress communications are available in coastal regions, but coverage is minimal to non-existent in polar regions and beyond VHF RF range
Solution Approach 1:
The patent introduces satellites as intermediary devices to relay DSC distress signals between vessels in polar/beyond-range areas and coastal DSC stations. The satellite receives the distress signal from a vessel's DSC transmitter, processes it, and retransmits it to appropriate coastal stations or directly to response authorities, thereby extending DSC coverage beyond the traditional VHF RF range limitation.
Solution Approach 2:
The patent transitions from a two-dimensional terrestrial DSC network limited to coastal and near-shore areas to a three-dimensional space-based system using satellites in orbit. This dimensional change enables global coverage including polar regions where conventional terrestrial DSC systems cannot operate, effectively adding a vertical dimension to the communication network.
2Ease of operation
If VHF DSC transceivers are used for distress communications, then automatic formatted distress alerts can be sent to surrounding vessels and coastal stations, but the system fails beyond the VHF RF range of about 10-20 miles
Solution Approach 1:
The satellite acts as an intermediary that receives automatic formatted distress alerts from VHF DSC transceivers and relays them beyond the VHF RF range limitation. The satellite captures the distress signal, processes the information, and forwards it to appropriate destinations, thereby extending the effective communication range while preserving the automatic alert capability.
Solution Approach 2:
The satellite-based system provides universal distress communication capability across all maritime environments, including polar regions and open oceans beyond VHF range. The system maintains compatibility with existing VHF DSC transceivers while adding global reach, making the distress alert system universally applicable regardless of vessel location.
3Reliability
If DSC coverage is extended to polar regions using satellites, then global DSC service is achieved, but system complexity increases due to satellite constellation requirements
Solution Approach 1:
The patent employs satellites as intermediary relays that simplify the overall system architecture by providing a centralized reception and processing point for distress signals. Rather than requiring complex direct vessel-to-vessel communication in polar regions, the satellite serves as a simple relay that receives signals from any location and forwards them to appropriate coastal stations or authorities.
Solution Approach 2:
The satellite-based DSC system is designed to automatically receive, process, and relay distress signals without requiring active participation or complex operations from vessels in polar regions. The system self-manages signal routing and processing, reducing the operational complexity for users while enabling global coverage.
Data Source
AI summary
Systems (100) and methods (400) for providing Digital Selective Calling (“DSC”) based services. The methods involve: using Space-Born Maritime (“SBM”) receivers of satellites (104) deployed in space as a satellite constellation to collect and process DSC emergency messages transmitted from DSC transmitters of terrestrial radios; using the satellites to position validate the DSC emergency messages; determining first positions of the DSC transmitters in transit based on geolocation data and time location data respectively assigned by the satellites to the DSC emergency messages; and validating the first positions to more precise second positions based on results of cross-correlations of the geolocation data and time location data with Automatic Identification Systems (“AIS”) data obtained for the DSC transmitters.