Direction Finder Quality Criterion for Emitter Count Reliability
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Solution Overview
Problem
High-resolution direction finding methods often provide unsatisfactory results when evaluating the number of signal emitters due to low sample counts, weak signal levels, and high coherent co-channel interferences, leading to incorrect or questionable emitter counts.
Innovation Solution
A method and device for direction finding that determines a quality criterion for the evaluated number of signal emitters by analyzing the distribution of eigenvalues, allowing users to assess the reliability of the evaluation without additional measurements, and optimizing scanning parameters to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If high-resolution direction finding is performed to evaluate the number of signal emitters, then additional information about signal sources is obtained, but the evaluation becomes improper under certain circumstances leading to incorrect emitter counts
Solution Approach 1:
The patent implements a feedback mechanism by determining a quality criterion for the incoming signals and using this criterion to assess the reliability of the emitter count evaluation. The system evaluates whether the evaluation result is trustworthy based on signal quality indicators, and this feedback information is made available to the user to judge the plausibility of the results.
Solution Approach 2:
The patent introduces an intermediary quality criterion that mediates between the raw signal data and the final emitter count evaluation. This quality criterion acts as an intermediate assessment layer that provides information about the reliability of the evaluation without requiring additional measurements, thus resolving the contradiction between obtaining information and maintaining reliability.
2Measurement precision
If the number of samples is increased to improve evaluation accuracy, then the measurement time increases, but with too low sample counts the evaluation becomes unreliable
Solution Approach 1:
The patent performs preliminary assessment of signal quality indicators before finalizing the emitter count evaluation. By determining the quality criterion in advance based on already gathered parameters during signal analysis, the system can assess reliability without requiring additional measurement time or samples.
Solution Approach 2:
The system uses the parameters already gathered during normal signal analysis to determine the quality criterion, making the existing data serve dual purposes: both for the primary direction finding evaluation and for assessing the reliability of that evaluation. This self-service approach avoids additional time expenditure.
3Loss of information
If signal processing is enhanced to separate coherent and incoherent co-channel interferences, then the number of signal emitters can be evaluated, but the processing complexity increases
Solution Approach 1:
The patent makes the existing signal processing components serve multiple functions: the correlation matrix calculation and eigenvalue analysis used for direction finding are also utilized to determine the quality criterion. This multi-functionality allows interference separation and reliability assessment without adding significant processing complexity.
Solution Approach 2:
The patent combines the quality criterion determination with the existing signal analysis process by using the same parameters (eigenvalue distribution, signal power estimates) that are already calculated during high-resolution direction finding. This merging approach avoids duplicating processing steps and reduces overall complexity.
Data Source
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AI summary
A method for direction finding is described wherein incoming signals are scanned and analyzed. The number of signal emitters within at least one frequency band is evaluated. A quality criterion for the incoming signals within the at least one frequency band is determined wherein the quality criterion indicates the quality of the evaluation. Further, a direction finder is described.