Pseudomorphic RF Signal Modulation for LPD and Anti-Jamming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tactical communication systems face challenges in achieving Low Probability of Detection (LPD) and robust Anti-Jamming (AJ) performance in non-permissive environments without sacrificing bandwidth and data rate, as techniques like spread spectrum often compromise these aspects.
Innovation Solution
The method involves pseudomorphic modulation of RF signals by selecting a physical modulation scheme, generating pseudorandom symbols, and mapping encoded data to these symbols, allowing the signal to mimic existing RF transmissions, thereby complicating detection and potential jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spread spectrum techniques are used to increase LPD and AJ performance, then detection probability and jamming resistance are improved, but bandwidth and data rate are sacrificed
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting modulation parameters (phase, amplitude, frequency) in a pseudorandom manner to create a signal that statistically resembles legitimate RF transmissions. This allows the system to achieve LPD and AJ performance without sacrificing bandwidth, as the signal maintains valid modulation characteristics while being difficult to detect and jam.
Solution Approach 2:
The patent uses copying by creating a pseudomorphic signal that replicates the statistical properties and modulation characteristics of legitimate RF transmissions. The signal copies the essential features of authorized signals (signal structure, power distribution, modulation patterns) to blend in with existing RF traffic, enabling detection avoidance without bandwidth loss.
2Productivity
If conventional modulation schemes are used for RF transmission, then bandwidth efficiency is maintained, but detection and jamming resistance are reduced
Solution Approach 1:
The patent applies dynamics by making the modulation parameters time-varying and pseudorandom rather than static. The signal characteristics change dynamically according to a pseudorandom sequence, making the signal adaptable and difficult to predict. This dynamic behavior provides resistance to detection and jamming while maintaining bandwidth efficiency through continuous valid modulation.
Solution Approach 2:
The patent uses preliminary action by pre-generating and synchronizing pseudorandom number sequences between transmitter and receiver before data transmission. This preliminary synchronization enables the receiver to properly demodulate the pseudomorphically modulated signal while the transmitter maintains bandwidth efficiency through standard modulation techniques applied to pseudorandomly varied parameters.
Data Source
AI summary
A method for pseudomorphic modulation to mimic a particular type of Radio Frequency (RF) signal transmission in an RF environment may include selecting a physical modulation scheme that is utilized for RF signal transmission in the RF environment. The method may also include pseudorandomly generating a plurality of symbols associated with the physical modulation scheme. The method may further include receiving encoded data for transmitting in the RF environment. The method may also include pseudomorphically modulating the encoded data by mapping the encoded data to the plurality of pseudorandomly generated symbols.