Dual-Channel RF Null-Steering for Multi-Band Anti-Jamming
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Solution Overview
Problem
Existing anti-jamming technologies are inefficient in recovering RF signals jammed across multiple frequency bands, as they typically operate in a single frequency band and lack robust multi-frequency null-steering mechanisms.
Innovation Solution
A dual-channel multi-frequency null-steering approach that utilizes a feedback loop to adjust the amplitude and phase of RF signals from multiple antenna elements, forming signal groups in different frequency bands, and aggregates these signals to minimize jamming effects, employing band-pass filters, vector modulators, and control logic to optimize signal recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-frequency anti-jamming technology is used, then device complexity is reduced, but reliability of signal recovery across multiple frequency bands deteriorates
Solution Approach 1:
The patent segments the RF signal processing into multiple independent frequency band channels, each with its own null-steering processing path. This allows parallel processing of different frequency bands while maintaining manageable complexity through modular architecture, where each segment handles a specific frequency range independently before aggregation.
Solution Approach 2:
The patent implements a universal anti-jamming system that processes multiple frequency bands through a common null-steering algorithm framework. The same feedback control mechanism and signal processing logic are applied across all frequency bands, making the system multi-functional while avoiding redundant complexity for each individual band.
2Reliability
If multi-frequency null-steering processing is implemented, then robustness against directional jamming is improved, but computational requirements and processing time increase
Solution Approach 1:
The patent performs preliminary frequency band separation and signal grouping before applying null-steering processing. By pre-organizing the multi-frequency signals into structured groups and identifying jamming characteristics in advance, the system reduces the computational burden during the actual null-steering optimization, thereby decreasing processing time while maintaining robustness.
Solution Approach 2:
The patent implements continuous feedback control that operates without interruption across all frequency bands simultaneously. The null-steering adjustment process maintains continuous signal processing and adaptation, avoiding repeated start-stop operations that would increase overall processing time, thus achieving both robustness and efficiency.
3Measurement precision
If feedback-based amplitude and phase adjustment is applied, then jamming signal null-steering precision is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback control mechanisms that continuously monitor the aggregated signal quality and adjust amplitude and phase parameters accordingly. The feedback loop compares the actual signal reception against desired performance metrics and automatically optimizes the null-steering parameters, achieving high precision through iterative refinement without requiring overly complex manual control systems.
Solution Approach 2:
The patent implements self-adjusting null-steering systems where the feedback control automatically optimizes signal parameters without external intervention. The system monitors its own performance and autonomously adjusts amplitude and phase settings to maintain optimal jamming rejection, reducing the need for complex external control infrastructure while achieving high precision.
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 method significantly enhances the efficiency, reliability, and robustness of RF signal recovery by effectively null-steering jamming signals across multiple frequency bands, allowing recovery from directional jamming from various directions.
Implementation Method 1
A feedback circuit adapted to adjust the amplitude and/or the phase of one or more filtered signals of each signal group according to comparison between the pair of filtered signals of the respective group until a difference between the amplitudes of the adjusted signals of each signal group is minimized and their phases are opposite
Data Source
AI summary
An anti-jamming circuit for null-steering jamming Radio-Frequency (RF) signals, comprising (1) an input circuit for receiving RF signals from multiple distinct antenna elements, and producing a plurality of signal groups each comprising a respective pair of filtered signals received from a respective pair of antenna elements each mapping them in one of the plurality of frequency bands, (2) a feedback circuit for adjusting the amplitude and/or the phase of the filtered signals of each signal group according to comparison between its pair of filtered signals until a difference between their amplitudes is minimized and their phases are opposite, aggregating the pair of adjusted signals of each signal group to produce a aggregated group signals, and aggregating the plurality of aggregated group signals to produce an overall aggregated signal, and (3) an output circuit for outputting the aggregated signal to a receiver adapted to extract data from the aggregated signal.