Homebrew Long-Baseline Interferometry (LBI) For Education and Research
summary
Claims a working long‑baseline interferometry prototype with a <$200 bill of materials, built from a dipole antenna, GPS antenna, Realtek RTL‑SDR receivers and a Raspberry Pi 4 + 32GB microSD running GNU Radio and BOINC. Design achieves coherent combining but limits baseline to several hundred meters because RTL‑SDR runs at 3 MHz sampling → 0.33 μs per sample, so uncorrected propagation delays (~42.5 ms across Earth) would break coherence; GPS DOP and ionospheric errors are identified and quantified for further compensation.
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chapters (8)
- 0:00Start
- 5:20Bill of Material Costs of the Proposed Homebrew Lbi Station
- 6:36Moore's Law
- 9:47Stargazing Technologies
- 12:36Cross Correlation
- 13:26Coherent Combining and Incoherent Combining
- 14:52System Function Diagram of Professional Grade Vlbi Implementation
- 18:26Propagation Errors
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