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Milestones

Publication plan: the repository is made public after milestone M3 (conducted test), once the publication checklist (issue #12) is done.

Each milestone has a matching GitHub milestone; the issues listed there are the source of truth for open work. This page records what each milestone is for and what has been reached.

M1 Signal definitions and data format — done in the initial skeleton

  • NavIC S and L5 SPS code generators, checked against ICD Table 7
  • GPS L1 C/A codes, used to check the shared shift-register code
  • SigMF read and write, with a truth annotation
  • CI: ICD checks, simulate-acquire-compare loop, command-line smoke test

M2 Software-only loop

Goal: quantify detection probability, false-alarm rate and loss sources using the simulator alone.

  • Simulator: C/N0, Doppler, crystal error, 10-bit quantisation, capture length
  • Acquisition that works on snapshots shorter than one code period
  • Detection probability versus C/N0 (snappnt sweep)
  • Recorded curves for each condition (issue #2). XIAO ESP32C3 condition: 50 % detection at 50.2 dB-Hz, 90 % at 52.0 dB-Hz (Detection probability).
  • Measured false-alarm rate (issue #1, False-alarm rate)
  • Noise-folding loss at low sample rates (issue #3, Noise-folding loss). Whether the ESP32-C61 band-limits at low sample rates is still open; see M4.
  • C/N0 estimate bias (issue #4, C/N0 estimate bias)
  • Faster acquisition (issue #5)

M3 Conducted test — condition for going public

Goal: capture with a real XIAO ESP32C3 fed from a generator through cables, and compare with the M2 curves.

  • ESP-SDR tuning and capture in the host client (issue #6)
  • snappnt capture (issue #8), level calculation and log template (issue #9), conversion of reference-receiver recordings (issue #10)
  • The test itself (issue #11). With the DC offset removed, the measured curve has the simulated slope and lies 0.7 dB to the right of it: 50 % detection at 50.9 dB-Hz, 90 % at 52.7 dB-Hz (Conducted test (M3)).
  • Publication checklist (issue #12)

M4 Longer captures with ESP32-C61

  • How low sample rates and ring-buffer capture work on the C61 (issue #13). Early simulation estimate at 4 MSa/s with four 1 ms blocks added non-coherently, assuming ideal band limiting: 50 % detection at about 37–38 dB-Hz.

M5 Acquire NVS-01 from the sky

  • Visibility, link budget and receive chain (issue #14)

M6 C-band

  • External mixer in the simulated frequency plan (issue #15)
  • LEO Doppler and Doppler rate (issue #16)