Implementation Strategies for a Software-Compensated FFT-based Generic Acquisition Architecture with Minimal FPGA Resources
| Autor: | René Landry, Francis Bourdeau, Marc-Antoine Fortin |
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| Rok vydání: | 2015 |
| Předmět: |
Computer science
business.industry SIGNAL (programming language) Real-time computing Fast Fourier transform Aerospace Engineering Software Computer engineering GNSS applications VHDL Overhead (computing) Electrical and Electronic Engineering Field-programmable gate array business computer Communication channel computer.programming_language |
| Zdroj: | Navigation. 62:171-188 |
| ISSN: | 0028-1522 |
| Popis: | A generic 2048-point FFT acquisition architecture is proposed to address L1 civil signals from all four GNSS constellations. After emphasizing hardware design criteria and their resulting design limitations, software compensation approaches are compared. A detailed validation methodology, involving a successive 1000-step Monte-Carlo study, was defined to optimally configure the acquisition channel, with new metrics to establish formal signal detection. The integration thereof results in a novel, minimalistic, yet generic, acquisition channel implementation, as well as a thorough validation method. Execution time of one acquisition iteration is approximately 5 ms, in line with VHDL simulations and foreseen channel management overhead. Coarse/fine search increments and thresholds are based on extensive experimentation. A 41 dB-Hz acquisition sensitivity threshold was established to achieve >95 % detection rates for 1 ms integrations, while 15 ms non-coherent integrations are required for signal strengths down to 37 dB-Hz. These thresholds account for known implementation losses. Copyright © 2015 Institute of Navigation |
| Databáze: | OpenAIRE |
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