Reconfigurable Signal Acquisition for Doppler and Delay Uncertainty
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Solution Overview
Problem
Signal acquisition systems face challenges in locating signals of interest due to unpredictable propagation delays and Doppler frequency shifts, leading to increased search space requirements and computational inefficiencies.
Innovation Solution
A reconfigurable signal acquisition system that dynamically adjusts correlation strategies across time and frequency domains, utilizing multiple streams with varying offsets and rates to optimize resource allocation for signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional signal acquisition methods are used to search for signals with unknown propagation delays and Doppler shifts, then signal detection capability is maintained, but computational complexity and search space requirements increase significantly
Solution Approach 1:
The patent divides the signal acquisition process into multiple parallel streams, each handling a specific subset of the search space. The correlation operation is segmented across N streams where each stream processes a portion of the code phase and Doppler frequency combinations, reducing the computational burden on any single processing unit while maintaining comprehensive signal search capability.
Solution Approach 2:
The patent implements a reconfigurable acquisition processor that can dynamically adjust its operation between different modalities. The system can switch between processing modes to optimize performance based on signal conditions, adjusting the number of streams, correlation window sizes, and search parameters in real-time to balance detection capability with computational efficiency.
2Reliability
If comprehensive search across time and frequency offsets is performed to handle unpredictable signal modifications, then signal detection reliability is improved, but processing time and resource consumption increase
Solution Approach 1:
The patent performs preliminary correlation operations across multiple streams simultaneously, pre-processing the signal data in parallel before final detection. By preparing multiple correlation streams in advance with different time and frequency offset hypotheses, the system reduces the time required for final signal acquisition while maintaining comprehensive search coverage.
Solution Approach 2:
The patent merges the results from N parallel correlation streams to produce the final signal detection output. By combining the processing power of multiple streams that each handle specific portions of the search space, the system achieves comprehensive time-frequency coverage faster than sequential processing would allow, reducing overall processing time while maintaining detection reliability.
Data Source
AI summary
A signal acquisition device includes an acquisition processor configured in a first modality, to correlate a set of RF signal samples across a plurality of time offset windows, wherein there are n streams and each of the n streams has a same frequency offset and a different time offset, and in a second modality, to correlate the set of RF signal samples across a plurality of frequency offset windows, wherein there are n streams and each of the n streams has a same time offset and a different frequency offset.