SBD Message Handling for Situational Awareness Packet Compression
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Solution Overview
Problem
The Short Burst Data (SBD) satellite system has a very low bandwidth, limiting the amount of data that can be transmitted for situational awareness, which requires efficient data compression and transmission methods to maintain real-time data exchange.
Innovation Solution
A message handler is developed to receive and transmit positional information over the SBD service, utilizing compression techniques such as reducing the bits for longitude and latitude, dividing the heading by a fraction of 360 degrees, and using 3 ranges for altitude compression, to minimize data size while ensuring critical information is prioritized and transmitted effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data compression is applied to reduce data size for SBD transmission, then data transmission efficiency is improved, but data accuracy and completeness deteriorate
Solution Approach 1:
The patent segments positioning data into hierarchical levels (full precision latitude/longitude, reduced precision, and relative position). The message handler selectively transmits different segmentation levels based on movement detection and operational context, thereby optimizing bandwidth usage while preserving accuracy only when necessary.
Solution Approach 2:
The patent dynamically changes data representation parameters based on operational conditions. When assets are stationary or movement is below thresholds, positioning updates are suppressed or transmitted at reduced precision (e.g., compressed coordinate formats). When movement exceeds thresholds, full precision is restored, thus adapting parameter quality to actual operational needs.
2Measurement precision
If full precision positioning data is transmitted continuously, then positioning accuracy is maintained, but bandwidth consumption increases
Solution Approach 1:
Instead of continuous full-precision transmission, the system implements periodic transmission triggered by movement events. The message handler monitors position changes and only initiates transmission when displacement exceeds predefined thresholds, converting continuous data flow into event-driven periodic transmissions that consume minimal bandwidth.
Solution Approach 2:
The patent extracts only the essential positioning information needed for situational awareness. Rather than transmitting complete high-precision coordinate sets for all assets continuously, the message handler extracts and transmits only position changes that exceed significance thresholds, eliminating redundant data transmission.
3Loss of time
If data transmission frequency is increased for real-time situational awareness, then data freshness is improved, but bandwidth requirements increase
Solution Approach 1:
The patent implements dynamic transmission frequency adjustment based on asset movement characteristics. Fast-moving assets trigger more frequent position reports, while stationary assets suppress transmissions. The message handler adapts reporting intervals in real-time based on detected movement patterns, optimizing the balance between data freshness and bandwidth consumption.
Solution Approach 2:
The system performs preliminary movement detection and filtering before data transmission. The message handler pre-processes positioning data to identify significant position changes, preparing only necessary transmission packets in advance. This preliminary action prevents unnecessary transmissions and ensures that when transmissions occur, they contain only timely and relevant information.
Data Source
AI summary
A message handler for receiving and transmitting positional information over a short burst data (SBD) service is provided. The message handler comprises a receiver for receiving packets with positional information from one or more mobile devices over the SBD service, a memory for storing the positional information, a transmitter for sending situational awareness packets to the one or more mobile devices, computer readable medium having computer readable instructions stored thereon for causing the message handler to receive the packets from the one or more mobile devices, store the positional information from the packets in the memory, select positional information based on parameters for the situational awareness packets, the selected positional information comprising at least longitude and latitude, heading and altitude for at least one mobile device, compress and combine the selected information to send in the situational awareness packets based on rules and send the situational awareness packets to the one or more mobile devices.