Dynamic Weight Processing for GPS Anti-Jamming
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Solution Overview
Problem
GPS systems are vulnerable to jamming and spoofing, with existing anti-jam processing techniques being costly, power-intensive, and limited in handling various types of jammers, and requiring precisely matched antenna elements, which restricts their performance over temperature ranges.
Innovation Solution
A dynamic weight processing system that uses finite impulse response filter correlation coefficients dynamically generated based on a pseudo-noise code to provide weighted signals, enabling nulling and beamsteering, and is adapted for space frequency and space time adaptive processing, reducing system cost and enhancing robustness against jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If excision filters and analog adaptive processing are used for anti-jam GPS, then some jamming types can be handled, but the number and type of jammers that may be handled is limited
Solution Approach 1:
The patent implements dynamic weight processing where filter weights are continuously adjusted based on incoming signal characteristics. The system dynamically adapts to different jammer types by modifying correlation weights in real-time, allowing it to handle multiple types of jammers (narrowband, wideband, pulse) that static filters cannot address effectively
Solution Approach 2:
The system changes filter parameters (weights) dynamically based on signal analysis. By modifying the correlation weights according to detected jammer characteristics, the system adapts its filtering behavior to counter different jamming techniques, thereby increasing versatility against various jammer types
2Object-affected harmful factors
If Space Frequency Adaptive Processing and Space Time Adaptive Processing are used, then anti-jam performance is improved, but system cost increases due to requirement for precisely matched antenna elements and RF components
Solution Approach 1:
The patent uses digital signal processing to create virtual copies of the desired signal path through correlation with pseudo-random codes. Instead of requiring physically matched antenna elements, the system digitally synthesizes the required signal processing functions, eliminating the need for expensive precision-matched hardware while maintaining anti-jam performance
Solution Approach 2:
The invention replaces mechanical/physical matching requirements (precise antenna element alignment, matched RF components) with digital signal processing operations. The correlation-based processing in the digital domain substitutes for the physical precision requirements, significantly reducing system cost while maintaining performance
3Object-affected harmful factors
If Space Frequency Adaptive Processing and Space Time Adaptive Processing are used, then anti-jam capability is enhanced, but performance degrades over wide temperature ranges
Solution Approach 1:
The system dynamically adjusts correlation weights based on real-time signal characteristics rather than relying on fixed hardware characteristics. This dynamic adaptation allows the system to compensate for temperature-induced variations in antenna and RF component performance, maintaining anti-jam capability across wide temperature ranges
Solution Approach 2:
The patent changes processing parameters (correlation weights) dynamically to compensate for environmental variations. By adapting the digital processing parameters rather than relying on stable physical components, the system maintains consistent anti-jam performance despite temperature fluctuations affecting hardware characteristics
4Object-affected harmful factors
If conventional anti-jam processing techniques are used, then some level of jamming protection is provided, but power consumption increases
Solution Approach 1:
The patent segments the signal processing into correlation-based operations that can be efficiently implemented in hardware. By dividing the anti-jam function into discrete correlation operations with dynamically adjusted weights, the system reduces overall power consumption compared to full adaptive processing while maintaining effective jamming protection
Solution Approach 2:
The system optimizes power consumption by changing processing parameters dynamically only when jamming is detected. The correlation weight adjustments are made selectively based on signal analysis, reducing unnecessary processing and associated power consumption while maintaining protection when needed
Data Source
AI summary
A dynamic weight processing system. The inventive system includes a first circuit for receiving an input signal and a second circuit for filtering the input signal with dynamic weights to provide a weighted signal. In an illustrative embodiment, the dynamic weights are finite impulse response filter correlation coefficients that are dynamically generated based on a pseudo-noise code. The system may also include a dynamic weight generator that generates the dynamic weights by combining weight values stored in a lookup table in a manner dependent on the pseudo-noise code. The weighted signal may be further processed to generate nulling and beamsteering weights for the input signal. In a more specific implementation for a GPS (Global Positioning System) application, the received signal is partitioned into space frequency adaptive processing (SFAP) bands and space time adaptive processing (STAP) is performed within the SFAP bands.