Dynamic Interference Nulling for Moving Platforms
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Solution Overview
Problem
Conventional methods for nulling interfering signals on moving platforms, such as guided projectiles, face challenges in dynamically adjusting antenna weight coefficients to effectively suppress rapidly changing interference sources due to delays and difficulties in tracking moving jammers.
Innovation Solution
An interference nulling system that utilizes dynamic motion data from sensors to update steerable null radiation patterns in real-time, incorporating adaptive weight logic to adjust antenna element coefficients based on platform position, orientation, and jammer movement, ensuring accurate direction of nulls towards interfering signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional beam forming is used to null out interfering signals, then the antenna array can suppress GPS jammers, but the system experiences delays and difficulty in tracking rapidly moving jammer sources due to the need to readjust antenna weight coefficients based on received signal levels
Solution Approach 1:
The system performs preliminary action by predicting the future position of the moving platform and preemptively updating the null radiation pattern to compensate for platform motion. Instead of waiting to detect interference and then reacting, the system proactively calculates where the null should be directed based on predicted platform dynamics, thereby eliminating the delay inherent in conventional reactive approaches.
Solution Approach 2:
The system implements dynamics by continuously adapting the antenna weight coefficients in real-time based on the predicted motion of the platform. The null radiation pattern is dynamically steered to track moving jammer sources, with the system transitioning from static to adaptive beam forming that responds to changing platform orientation and position.
2Adaptability or versatility
If the antenna weight coefficients are readjusted based on received level of interfering signals, then the null direction can be updated, but the system cannot keep up with rapidly changing dynamics of the platform
Solution Approach 1:
The system uses predicted platform position and orientation to preemptively determine the appropriate null direction before the platform actually reaches that state. This preliminary calculation allows the system to anticipate required adjustments rather than reacting to them, achieving faster effective tracking speed.
Solution Approach 2:
The system implements feedback by continuously monitoring the actual platform motion and comparing it with predictions, then using this information to refine future null pattern updates. The adaptive weight logic adjusts coefficients based on both predicted motion and actual interference measurements, creating a closed-loop system that improves tracking accuracy and speed.
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 allows for accurate and timely suppression of interfering signals in highly dynamic conditions, improving update latency and enabling continuous tracking of jammer sources, even when they change direction or cease transmission.
Implementation Method 1
Beamforming is accomplished by combining antenna elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference
Data Source
AI summary
A system and method for nulling or suppressing interfering signals directed toward moving platforms based, at least in part, on dynamic motion data of the moveable platform is provided. The system may be an interference nulling system carried by a moveable platform and may include an antenna array including two or more antenna elements that generates at least one initial steerable null radiation pattern, dynamic motion data logic that determines dynamic motion data of the moveable platform; and update logic that updates the at least one initial steerable null radiation pattern based, at least in part, on the dynamic motion data. The at least one updated steerable null radiation pattern is directed toward a direction from which interfering signals are being transmitted from an interfering signal source.