Correlation Direction Finding Using Real-Only Signal Correlation
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Solution Overview
Problem
Current direction finding systems face limitations in processing speed and accuracy due to the complexity of correlation interferometry direction finding (CIDF) processes, particularly when dealing with modern emitters that operate in multiple frequencies and have low probability of intercept (LPI) characteristics, leading to increased processing time and memory requirements.
Innovation Solution
The implementation of Phase Only Real Correlation Interferometry Direction Finding (POR-CIDF) and Real Correlation Interferometry Direction Finding (R-CIDF) processes, which utilize only the real portion of the correlation coefficient to enhance processing speed and reduce memory requirements while improving direction finding accuracy, by simplifying calculations and reducing the need for complex number operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional correlation interferometry direction finding (CIDF) processes are used to compare detected signals with large databases, then direction finding accuracy can be maintained, but processing time increases and processing speed decreases
Solution Approach 1:
The patent extracts only the real portion of the correlation coefficient from the full complex correlation calculation, eliminating the need to process imaginary components. This extraction of the essential real portion maintains direction finding accuracy while reducing computational complexity and processing time required for comparing detected signals with database entries
Solution Approach 2:
The patent changes the parameter being processed from the full complex correlation coefficient to only its real portion. This parameter change transforms the computation from handling both real and imaginary components to processing solely the real component, thereby reducing the number of calculations while preserving the directional information needed for accurate bearing determination
2Reliability
If traditional CIDF processes use complex number operations and large databases, then comprehensive signal analysis is achieved, but memory requirements increase
Solution Approach 1:
The patent extracts only the real portion of the correlation coefficient, eliminating storage requirements for imaginary components. This extraction reduces the quantity of data that must be stored in memory while maintaining the essential signal characteristics needed for reliable direction finding and comprehensive signal analysis
Solution Approach 2:
The patent changes the stored parameter from the full complex correlation coefficient to only its real portion. This parameter change reduces memory requirements by eliminating the need to store imaginary components, while still preserving sufficient information for complete and reliable signal analysis across multiple frequencies and channels
3Reliability
If traditional CIDF processes perform large numbers of calculations to handle agile LPI emitters, then detection capability is maintained, but processing time exceeds detection time
Solution Approach 1:
The patent extracts only the real portion of the correlation coefficient, dramatically reducing the number of calculations required per signal comparison. This extraction enables the system to maintain detection capability for agile LPI emitters while reducing processing time to within the brief detection windows provided by these fast-switching signals
Solution Approach 2:
The patent changes the computational parameter from full complex correlation to real portion only, reducing the calculation burden for each signal analysis. This parameter change allows the system to process signals from agile LPI emitters quickly enough to maintain detection capability while operating within the constrained time available before these evasive signals switch frequency or channel
Data Source
AI summary
Correlation interferometry direction finding (CIDF) processes that significantly improve processing time and cut memory requirements relative to the current memory requirements are provided herein. The presently disclosed processes further may utilize only the real portion of the correlation coefficient of the RF signal to further increase processing speed and decrease memory requirements while simultaneously improving direction finding accuracy and reducing the number of wild bearings reported.