GPS Jammer Rejection via Peak List Storage
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Solution Overview
Problem
GPS signals received on Earth are extremely weak, often below the thermal noise level, making it difficult for receivers to detect valid signals due to interference, especially in indoor environments where signal attenuation is significant.
Innovation Solution
A method and apparatus for signal processing that involves correlating a received code with a reference code to identify code phase and frequency hypotheses, selecting peaks, and storing them to reject frequency hypotheses based on the corresponding lists, effectively enhancing signal detection in noisy conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal processing is performed in noisy environments, then signal detection capability is improved, but false peak detection increases
Solution Approach 1:
The patent implements feedback through iterative processing where correlation results are used to generate test statistics, which then feed back into the decision-making process for identifying valid peaks versus false peaks, allowing continuous refinement of detection accuracy
Solution Approach 2:
The patent replaces simple threshold-based mechanical detection with statistical hypothesis testing and correlation analysis, substituting direct signal processing with mathematical modeling to distinguish true signals from noise
2Measurement precision
If correlation processing is performed to identify code phase and frequency hypotheses, then signal detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the correlation processing into distinct stages: generating correlation results for multiple hypotheses, selecting peaks based on statistical tests, and making final decisions based on test statistics, thereby reducing overall complexity through structured decomposition
Solution Approach 2:
The patent changes processing parameters dynamically based on signal conditions, adjusting correlation processing intensity and statistical test thresholds to balance detection accuracy with computational complexity
3Reliability
If peak selection and storage lists are maintained for frequency hypotheses, then jammer rejection capability is improved, but memory requirements increase
Solution Approach 1:
The patent extracts only the essential information needed for jammer rejection by storing peak locations and associated test statistics rather than maintaining complete correlation data, thereby reducing memory requirements while preserving rejection capability
Solution Approach 2:
The patent discards redundant correlation data that does not contribute to jammer identification, retaining only the peak information and test statistics necessary for frequency hypothesis rejection
Data Source
AI summary
A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.