Satellite Terminal Transmission Obfuscation via Dynamic Power Spectral Density
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Solution Overview
Problem
Existing methods for obfuscating satellite transmissions are either inefficient in resource usage or ineffective in preventing eavesdropping, as they either maintain constant power and data rates or rely on randomization methods that do not adequately protect against intercept and detection by adversaries.
Innovation Solution
A method that calculates and distributes unused transmission power spectral density across distributed satellite terminals to randomize transmission activity, ensuring obfuscation while maintaining aggregate power within regulatory limits, using a computer program to adjust power spectral density levels and data rates in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite terminals transmit at peak power and data rate to meet demand, then quality of service is maintained, but transmission activity becomes predictable and detectable by eavesdroppers
Solution Approach 1:
The system dynamically adjusts transmission power spectral density for individual terminals based on real-time conditions. The network controller varies power levels around an operating point, making transmission activity unpredictable to eavesdroppers while maintaining adequate service quality through adaptive resource allocation.
Solution Approach 2:
The invention changes the power spectral density parameter for each terminal dynamically. By varying this physical parameter based on network conditions and terminal requirements, the system achieves both obfuscation against eavesdropping and maintenance of service quality through controlled parameter adjustments.
2Object-affected harmful factors
If transmission power is reduced to lower detectability, then obfuscation against eavesdroppers improves, but data rate and quality of service deteriorate
Solution Approach 1:
The system merges the obfuscation function with the resource allocation function. By jointly optimizing power spectral density for both security and efficiency objectives, the network achieves dual benefits: reduced detectability through power variation and maintained data rates through adaptive allocation of available power resources.
Solution Approach 2:
The system changes power spectral density parameters dynamically to achieve both obfuscation and maintain productivity. By adjusting these parameters based on real-time network conditions and terminal requirements, the system prevents detectability while preserving adequate data rates through adaptive control.
3Object-affected harmful factors
If random time slot assignment is used to obfuscate transmission activity, then detectability is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The system uses dynamic power spectral density adjustment rather than static random time slot assignment. This dynamic approach allows continuous adaptation to traffic conditions, maintaining resource utilization efficiency while achieving obfuscation through power variation, unlike fixed random time assignments that waste resources during idle periods.
Solution Approach 2:
The invention changes the power spectral density parameter continuously rather than using discrete random time slot assignments. This parameter-based approach provides finer control over transmission characteristics, achieving obfuscation while maintaining better resource utilization by allowing terminals to transmit whenever needed at appropriate power levels.
4Object-affected harmful factors
If fixed transmit power is used to prevent detection of activity changes, then obfuscation improves, but efficiency decreases due to inability to adapt to varying traffic demand
Solution Approach 1:
The system implements dynamic power spectral density adjustment that adapts to varying traffic demand in real-time. This dynamic control allows the network to maintain obfuscation properties while efficiently allocating power resources according to actual traffic conditions, avoiding the waste inherent in fixed power operation.
Solution Approach 2:
The system changes power spectral density parameters adaptively based on traffic conditions rather than maintaining fixed values. This parameter adaptation enables the system to achieve both obfuscation (through variation) and efficiency (through condition-based optimization), resolving the contradiction between fixed power security and variable demand efficiency.
Data Source
AI summary
A network for obfuscating satellite terminal transmission activity may include a satellite, a plurality of distributed satellite terminals transmitting signals to and receiving signals from the satellite, and a computer. The computer may compute how much transmission power spectral density each of the distributed satellite terminals is or would be transmitting based on allocated data rates of each of the distributed satellite terminals. The computer may calculate an aggregate transmission power spectral density which is being used or would be used by all of the distributed satellite terminals. The computer may calculate how much unused transmission power spectral density is available to the network for obfuscation by subtracting from a total network regulatory transmission power spectral density limit the aggregate transmission power spectral density. The computer may determine a random distribution of at least a portion of the unused transmission power spectral density to one or more of the distributed satellite terminals. The transmission power spectral density levels of one or more of the distributed satellite terminals may be adjusted by the computer to distribute the portion of the unused transmission power spectral density according to the random distribution determination.