Receiver Synchronization Using Peak Ratio Correlator Alignment
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Solution Overview
Problem
Existing methods for synchronizing receivers with ambiguous signals, such as those with multiple peaks, face challenges in accuracy due to signal distortions and multipath effects, leading to incorrect peak alignment and significant errors in range estimation.
Innovation Solution
A method involving the use of additional correlators to detect and correct false peak acquisitions by determining peak ratios and aligning the correlator pattern with the auto-correlation function, ensuring reliable peak identification and synchronization, even in low signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional correlators are used to detect and correct false peak acquisitions, then synchronization accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the correlation function analysis into multiple discrete correlators, each responsible for detecting specific peaks. By segmenting the detection task across multiple correlators with assigned delay values, the system achieves accurate peak identification without requiring a single complex detection mechanism.
Solution Approach 2:
The patent introduces an intermediary processing stage that compares correlation values from multiple correlators and determines peak assignments. This intermediary layer reconciles the outputs of multiple correlators, enabling accurate synchronization while managing the complexity through a structured comparison and assignment mechanism.
2Reliability
If peak ratio determination is used to identify correct peaks, then reliability of synchronization is improved, but measurement difficulty increases
Solution Approach 1:
The patent transforms the peak identification problem by changing the parameter from absolute correlation value comparison to ratio-based comparison. By determining ratios between correlation values of different peaks and comparing them to expected ratios, the system achieves more reliable peak identification that is less sensitive to signal distortions and multipath effects.
Solution Approach 2:
The patent implements a feedback mechanism where the determined peak ratios are compared against expected ratios, and the synchronization is adjusted based on this comparison. This feedback loop continuously refines the peak identification, improving reliability by correcting deviations caused by signal distortions or environmental factors.
Data Source
AI summary
Method and receiver synchronizing receiver with received ambiguous signal having at least two peaks. Method includes providing information about known transmitted signal having a number of at least two peaks, the information including number of peaks and distances between at least two peaks, determining ratios between peaks of known transmitted signal and assigning determined ratio value to each peak, and deducing theoretical auto-correlation function from known transmitted signal. Auto-correlation function has number of correlations corresponding to number of peaks in known transmitted signal and correlators of the auto-correlation function are provided in same distance and have the same relative ratio as peaks in known transmitted signal. Further includes tracking received signal with auto-correlation function so that correlator pattern of auto-correlation function is aligned with peak pattern of received signal by assigning each peak of the received signal to a correlator of the auto-correlation function, and identifying each peak.