Adjustable Nulling Combiner for Wideband RF Anti-Jamming
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Solution Overview
Problem
Existing anti-jamming systems struggle to provide wideband cancellation of radio frequency signals due to narrow cancellation bandwidth and imprecise time delay, failing to effectively protect wideband GPS and other RF signals from interference.
Innovation Solution
The system adjusts cancellation bandwidth by controlling the Time Difference of Arrival (TDOA) of antenna signals at a combiner, using a symmetric or asymmetric design with controllable delay elements and phase rotators, and employs space-time adaptive processing to form spatial nulls for precise jammer cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cancellation devices are used, then interference can be reduced, but the cancellation bandwidth is narrow and cannot protect wideband GPS signals
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by making the cancellation device adaptable to different signal bandwidths. The system can dynamically configure its cancellation parameters to match the bandwidth of the protected signal, whether narrowband GPS L1 or wideband L5 signals, resolving the contradiction between reliable interference cancellation and bandwidth adaptability
Solution Approach 2:
The invention changes key parameters including time delay of arrival (TDOA) and bandwidth settings to optimize cancellation performance for different signal types. By adjusting these parameters, the system maintains effective interference protection across varying bandwidth requirements
2Measurement precision
If fixed time delay is used in cancellation, then device complexity is reduced, but time delay precision is insufficient for accurate jammer cancellation
Solution Approach 1:
The patent replaces mechanical or fixed delay structures with electronically controlled delay mechanisms. This substitution enables precise TDOA adjustment through electronic programming rather than physical configuration, achieving high time delay precision without proportionally increasing hardware complexity
Solution Approach 2:
The system employs dynamic time delay adjustment capabilities, allowing the delay parameters to be programmatically configured based on the specific jamming scenario and signal characteristics, thereby achieving precision without permanent complex hardware
3Device complexity
If narrowband cancellation is used, then device complexity is minimized, but the entire frequency band cannot be protected
Solution Approach 1:
The patent designs a universal cancellation system that can handle multiple bandwidth requirements through a single device architecture. The system performs both narrowband and wideband cancellation functions by reconfiguring its parameters, eliminating the need for separate devices for different bandwidth scenarios
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
Achieves wideband cancellation capable of protecting entire frequency bands, such as Wi-Fi and military communication bands, by creating deep nulls with adjustable cancellation bandwidth, ensuring robust protection against interference.
Implementation Method 1
a summer that subtracts the estimated strong interference portion from the received signals to create a summed signal
Data Source
AI summary
Anti-jamming arrays, systems, and methods are disclosed by forming cancellation nulls having an adjustable cancellation bandwidth and/or null depth to assure reception of position, navigation and timing, command and control, or other signals of interest. Signals are matched with respect to time difference of arrival (TDOA) and phase at a combiner to provide enhanced cancellation depth and bandwidth.