Angle-Modulated Photonic Link Interference Suppression
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Solution Overview
Problem
Conventional techniques for mitigating high-power interference in RF receivers require detailed knowledge of the interfering signal's frequency and/or time-delay, limiting their effectiveness in suppressing wideband interference and maintaining a linear response to small signals.
Innovation Solution
The use of an externally angle-modulated photonic link with a non-linear power-dependent transmission function allows for the suppression of strong interfering signals without knowledge of their type or location, maintaining a linear response for weak signals by configuring the optical link to operate at specific 'zeroes' of the Bessel function response, independent of frequency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interference mitigation techniques are used, then interference suppression is achieved, but detailed knowledge of interferer frequency and time-delay is required
Solution Approach 1:
The optical link automatically identifies and suppresses interferers by monitoring its own output for signal zeros without external control. The system self-adjusts by detecting when the output signal drops to zero (indicating interferer presence) and automatically modifies operating parameters to maintain suppression while preserving desired signals.
Solution Approach 2:
The system continuously monitors the optical link output and uses this feedback to detect interferer presence through signal zeros. This feedback mechanism enables automatic adjustment of operating parameters without requiring pre-programmed interferer information, allowing the system to adapt to varying interference conditions.
2Object-affected harmful factors
If conventional interference mitigation techniques are used, then interference suppression is achieved, but the system becomes blind during transmission
Solution Approach 1:
The system dynamically adjusts operating parameters in real-time based on detected interferer conditions. When interferers are detected through output signal zeros, the system automatically modifies its operating state to maintain suppression effectiveness while ensuring continuous transmission capability, avoiding the blind period problem.
Solution Approach 2:
The optical link autonomously manages interference suppression without requiring external intervention or sacrificing transmission continuity. The self-service mechanism detects and responds to interferers automatically, maintaining both suppression effectiveness and transmission reliability simultaneously.
3Object-affected harmful factors
If conventional interference mitigation techniques are used, then interference suppression is achieved, but the system requires precise phase knowledge
Solution Approach 1:
The system eliminates the need for precise phase knowledge by using self-service detection through output signal zeros. The automatic detection mechanism identifies interferers based on amplitude zeros in the output signal, completely removing the requirement for precise phase measurement or knowledge while maintaining effective suppression.
Solution Approach 2:
The system replaces phase-based interference suppression mechanisms with amplitude-based zero detection. By substituting the requirement for precise phase measurement with simpler amplitude threshold detection (signal zeros), the system achieves interference suppression without needing complex phase tracking or precise phase knowledge.
4Object-affected harmful factors
If the optical link operates at high power to suppress interference, then interference suppression is improved, but the linear response to small signals is compromised
Solution Approach 1:
The system dynamically adjusts operating power levels based on detected interference conditions. When interferers are present, the system temporarily operates at adjusted power levels to achieve suppression, then returns to linear operating conditions for small signals. This dynamic adjustment maintains both suppression effectiveness and linear response capability.
Solution Approach 2:
The system segments the operating range into different modes: a suppression mode for handling interferers and a linear mode for processing small signals. By segmenting the operational states and switching between them based on signal conditions, the system maintains linear response for small signals while achieving interference suppression when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses wideband interference while preserving small signal information, enhancing radar operation and signal collection by eliminating the need for continuous filter tuning and precise phase knowledge.
Implementation Method 1
an externally angle-modulated photonic link with a non-linear power-dependent transmission function
Implementation Method 2
configuring the optical link to operate at specific 'zeroes' of the Bessel function response
Implementation Method 3
non-linear power-dependent transmission function allows for the suppression of strong interfering signals
Implementation Method 4
operate at specific 'zeroes' of the Bessel function response
Data Source
AI summary
Systems and method are provided to for suppressing interference signals in optical systems, without prior knowledge of the type of location of the interferers, while maintaining a linear response to small signals of interest (SOI). By exploiting the unique power (or voltage) dependent transmission function of an externally angle-modulated photonic link, embodiments of the present disclosure are configured to provide strong, wideband interference suppression without requiring detailed knowledge of the interfering signal.