Satellite Selective Spectrum Recording for Memory-Efficient Data Collection
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Solution Overview
Problem
Existing satellite-based data collection methods for IoT networks face challenges in resource-intensive memory and bandwidth usage due to the need to record entire spectral bands or complex onboard demodulation, limiting flexibility and increasing satellite complexity.
Innovation Solution
A selective spectrum recording method that involves receiving a main signal, sampling for a preamble signal, and storing only relevant data samples within specific frequency bands, allowing for simple satellite design and efficient memory and bandwidth usage, while enabling the coexistence of different waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the satellite records the entire spectral band, then all messages from terminals can be collected, but the memory and bandwidth resources are consumed excessively
Solution Approach 1:
The patent extracts only the essential preamble signals from the recorded spectral band to identify terminal transmissions, then stores only the corresponding data portions. This extraction approach allows the satellite to distinguish useful messages from unnecessary spectral data, reducing memory and bandwidth consumption while maintaining complete data collection capability through the preamble-based indexing system.
Solution Approach 2:
The patent segments the spectral band into preamble frequency bands and data frequency bands, processing and storing only the relevant portions. By dividing the continuous spectral recording into discrete, identifiable segments marked by preambles, the system can selectively store only the data portions associated with actual terminal messages, significantly reducing the quantity of stored data while maintaining collection completeness.
2Quantity of substance
If the satellite demodulates signals onboard, then only messages are stored (reducing memory usage), but the satellite conception becomes far more complex
Solution Approach 1:
The patent introduces the preamble signal as an intermediary element that carries identification information about terminal transmissions. Instead of requiring the satellite to demodulate entire signals, the preamble acts as a mediator that allows the satellite to identify and index data portions without full demodulation capability, thus reducing memory usage while avoiding complex onboard demodulation hardware.
Solution Approach 2:
The patent extracts only the preamble signals for processing and uses them to identify and retrieve corresponding data portions, rather than extracting and processing entire modulated signals. This extraction of only the identification-bearing preambles allows the satellite to store minimal data (only the data portions, not entire signals) without requiring complex onboard demodulation capabilities.
3Device complexity
If a fixed protocol is used for demodulation, then the satellite design is simplified, but the communication system loses flexibility
Solution Approach 1:
The patent implements a dynamic protocol where the satellite records spectral bands and uses preamble detection to adaptively identify and retrieve data portions. This dynamic approach allows the system to handle different terminal protocols and modulation schemes without requiring the satellite to be pre-configured for specific demodulation methods, thus maintaining design simplicity while achieving communication flexibility.
Solution Approach 2:
The patent changes the operational parameters from fixed protocol-based processing to spectral recording with preamble-based identification. By recording the spectral band and detecting preambles as key parameters, the system can adapt to different communication protocols and modulation schemes dynamically, maintaining satellite design simplicity while achieving versatility in handling various terminal types.
Data Source
AI summary
A method for collecting at least one message received from at least one terminal, the method being performed on-board a satellite, includes receiving, continuously in time, a main signal over a main frequency band, sampling the received main signal, searching, in the samples of the main signal, a preamble signal emitted by the terminal, the preamble signal being included in a preamble frequency band, the preamble frequency band being included in the main frequency band, if a preamble signal has been found at the procedure of searching, storing data digital samples of at least one data signal in the memory of the satellite, the data signal being included within at least one data frequency band comprised in the main frequency band, the digital samples resulting from a sampling of the received signal within the data frequency band.