Segmented Frequency Domain Correlation for Doppler Binning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resilient waveforms with long correlation sequences require substantial processing resources for waveform acquisition, and platform dynamics exacerbate this issue by introducing Doppler shift and sample rate uncertainty, which can cause signals to rotate on the complex plane and fail to correlate.
Innovation Solution
A computer apparatus or communication system in a mobile platform applies a plurality of Doppler offsets within a range of potential Doppler offsets, performs spectral analysis for correlators in each Doppler offset signal, and uses a signal with the best correlation score to identify the actual Doppler offset. The system also pads the signal, segments correlators, and uses a polynomial interpolator to correct sample rates for each Doppler offset signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long correlation sequences are used for resilient waveforms, then waveform acquisition capability is improved, but processing resource requirements increase substantially
Solution Approach 1:
The patent segments the long correlation sequence into multiple shorter segments and processes them in parallel with multiple correlators operating at different Doppler offsets. This divides the substantial processing task into manageable chunks that can be executed concurrently, reducing the processing resource burden while maintaining the effectiveness of the long correlation sequence for waveform acquisition.
Solution Approach 2:
The patent applies Doppler offsets to create multiple Doppler offset signals before performing correlation. This preliminary action prepares multiple candidate signals in advance, allowing the system to identify the correct Doppler offset and maintain signal correlation without requiring excessive processing resources during the actual acquisition phase.
2Adaptability or versatility
If platform dynamics are accommodated to handle Doppler shift and sample rate uncertainty, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the correlator into multiple parallel correlators, each handling a specific Doppler offset. This segmentation allows the system to accommodate Doppler shift and sample rate uncertainty through a structured, modular architecture where each correlator is relatively simple but the collective system achieves high adaptability.
Solution Approach 2:
The patent changes the Doppler offset parameter across multiple correlators to create a set of Doppler offset signals. By systematically varying this parameter, the system can identify the actual Doppler offset and maintain signal correlation under dynamic conditions without requiring complex adaptive algorithms in each individual correlator.
3Productivity
If signal padding and correlator segmentation are applied, then processing efficiency is improved, but computational overhead increases
Solution Approach 1:
The patent segments the correlator and processes signals in parallel segments with different Doppler offsets. This segmentation improves processing efficiency by enabling concurrent computation across multiple correlators, and the computational overhead of padding is distributed across these parallel operations rather than concentrated in a single sequential process.
Data Source
Figure 1
Figure 2
AI summary
A communication system in a mobile platform receives a signal and applies a plurality of Doppler offsets within a range of potential Doppler offsets. Spectral analysis is performed for correlators in each of the Doppler offset signals, and a signal with a best correlation score is used to identify the actual Doppler offset of the signal. The signal is padded by some predetermined length and correlators are segmented. A polynomial interpolator (122; 124) corrects the sample rate for each one of the Doppler offsets signals.