GPS Receiver K-Median Threshold Anti-Jamming Algorithm
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Solution Overview
Problem
GPS receivers are vulnerable to electronic wave jamming due to their weak signal reception, and existing anti-jamming techniques face challenges in effectively canceling interference signals, especially in multi-jamming environments, requiring complex calculations and hardware improvements.
Innovation Solution
A method and apparatus using a frequency-domain anti-jamming algorithm with a K-median threshold value adjustment scheme to determine an optimum adjustable threshold value, reducing communication interference without hardware upgrades, by selecting a median value in the frequency domain and applying it to eliminate jamming signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed threshold value is set to cancel interference, then the threshold is simple to implement, but it cannot effectively cancel interference signals with amplitude smaller than the threshold value
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed threshold to a variable threshold that adapts based on signal characteristics. The threshold is dynamically adjusted according to the amplitude of interference signals and the strength of GPS signals, allowing the system to effectively cancel interference while maintaining simplicity in implementation through automated adjustment mechanisms.
2Reliability
If the threshold value is changed to cancel smaller interference signals, then the interference cancellation effectiveness improves, but it requires complicated calculation procedures and additional hardware improvements
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust the threshold value based on its own signal measurements without requiring external intervention or complex manual calculation procedures. The system monitors signal amplitudes and autonomously modifies the threshold, eliminating the need for complicated calculation procedures while maintaining effective interference cancellation.
3Ease of manufacture
If a fixed threshold value is used, then the implementation is simple, but it cannot handle multi-jamming or several types of jamming sources effectively
Solution Approach 1:
The patent applies dynamics by implementing a variable threshold that automatically adapts to different jamming conditions. The threshold dynamically adjusts based on the detected signal environment, enabling the system to handle multi-jamming and various types of interference sources effectively while maintaining a relatively simple implementation structure through automated adaptation.
4Reliability
If complex statistical processing is applied to determine threshold values, then the anti-jamming performance improves, but the calculation complexity and hardware requirements increase
Solution Approach 1:
The patent applies self-service by enabling the system to automatically determine appropriate threshold values through built-in signal analysis mechanisms without requiring complex external statistical processing. The system performs self-diagnosis and self-adjustment based on signal characteristics, achieving improved anti-jamming performance while avoiding the complexity of elaborate mathematical calculations and additional hardware requirements.
Data Source
AI summary
A method and apparatus for improving anti-jamming performance are provided. A threshold value level estimated in a GPS (global positioning system) receiver RF/IF stage, a threshold value weight, a median value of a median value of a 2˜8 MHz bandwidth is estimated as a threshold value with respect to a frequency component exceeding the estimated threshold value level, and an adjustable K-median threshold scheme is provided in a multi-jamming environment.