Flight Heritage Telemetry Overlay & Interactive Signal Museum
Compare observed in-orbit decay against Solar Cycle 25 models, synthesize CW/FSK/GMSK/LoRa baseband waveforms, and export .WAV samples.
PHASE 3A · FLIGHT RE-ENTRY EPOCH VS. ANALYTICAL DRAG INTEGRATOR
In-Orbit Flight Heritage Overlay (Grizu-263A & Delfi-PQ)
Comparison of nadir lab.’s numerical King-Hele drag integrator (simulateDecay in lib/physics/decay.ts) driven by NOAA SWPC observed monthly F10.7 for a priori nominal (B = 0.039 m²/kg) and effective (B_eff ≈ 0.050 m²/kg) ballistic parameters against the observed re-entry epoch (CelesTrak SATCAT 2 Oct 2023 / SatNOGS DB 3 Oct 2023, Day 628) and the constant F10.7 = 100 sfu pre-launch forecast.
- Effective B_eff ≈ 0.050 m²/kg (matches Day 628 re-entry)
- A priori nominal B = 0.039 m²/kg (774 days)
- Pre-Launch Forecast (Fixed F10.7 = 100 sfu, Ap = 12, 3.4 yr)
- Co-Manifested 1U CubeSat (1.33 kg, B = 0.0248 m²/kg)
Show the data as a table
| Mission elapsed time (days since 13 Jan 2022) | Effective B_eff ≈ 0.050 m²/kg (matches Day 628 re-entry) | A priori nominal B = 0.039 m²/kg (774 days) | Pre-Launch Forecast (Fixed F10.7 = 100 sfu, Ap = 12, 3.4 yr) | Co-Manifested 1U CubeSat (1.33 kg, B = 0.0248 m²/kg) |
|---|---|---|---|---|
| 0 | 525 | 525 | 525 | 525 |
| 150 | 515 | 518 | 519 | 520 |
| 300 | 502 | 508 | 512 | 515 |
| 450 | 469 | 487 | 503 | 504 |
| 628 | — | 444 | 491 | 487 |
| 774 | — | 202 | 479 | 469 |
| 850 | — | — | — | — |
PHASE 3B · BASEBAND AUDIO & WATERFALL SYNTHESIZER
Interactive SmallSat Signal Museum (CW, 2-FSK, GMSK & LoRa CSS)
Synthesize real baseband waveforms in your browser via Web Audio API, inspect their time-frequency spectrogram, and export 16-bit PCM .WAV reference files.
Linear frequency-modulated up-chirps and sync down-chirps across band; closes links from LEO with omnidirectional ground antennas.
- Occupied BW
- 125 kHz
- Demod Threshold
- SNR -15.0 dB
DETERMINISTIC PHYSICS & DATA METHODOLOGY
How This Calculator Works
Source modules: components/lab/v4-suite.tsx, lib/physics/decay.ts, lib/data/f107-observed.ts
Pairs an analytical orbital-decay reconstruction against observed NOAA SWPC Cycle 25 monthly F10.7 flux for Transporter-3 PocketQube Grizu-263A with a deterministic 22.05 kHz PCM baseband audio and waterfall synthesizer covering five amateur small-satellite modulations.
Governing Equations & Physical Model
da/dt = −√(μ·a) · ρ(h, F10.7_obs(t), Ap=12) · B_effCompares pre-launch fixed F10.7 = 100 sfu forecast, a priori nominal B = 0.039 m²/kg, and effective B_eff = 0.0502 m²/kg against Day 628 re-entry.
s(t) = A(t) · sin(∫ 2π·f_inst(t) dt) + n(t), f_s = 22,050 HzSynthesizes 16-bit RIFF/WAVE samples for CW Morse, 2-FSK 4800 Bd, GMSK 9600 Bd (BT = 0.5), BPSK 1200 Bd, and LoRa SF10 chirps.
Inputs, Parameters & Units
| Parameter | Unit | Physical definition |
|---|---|---|
| Modulation preset | CW / FSK / GMSK / BPSK / LoRa | Selects baseband modulation scheme for WebAudio playback, waterfall inspection, and .WAV export. |
Assumptions & Validity Limits
- Audio waveforms are illustrative baseband PRBS syntheses of each modulation class—not off-air recordings of specific spacecraft transmissions.
- Grizu-263A re-entry epoch uses CelesTrak SATCAT 2023-10-02 (SatNOGS DB 2023-10-03 00:00 UTC, Day 628 from 2022-01-13 deployment).
Worked Default Reference Case
Constant F10.7 = 100 sfu predicted ~3.6 years; observed monthly Cycle 25 flux shortens nominal B = 0.039 m²/kg life to 774 days, and B_eff = 0.0502 m²/kg reproduces the observed 628-day re-entry.
- Pre-launch forecast (100 sfu)
- 3.6 years
- Nominal B = 0.039 (obs. F10.7)
- 774 days
- Effective B_eff = 0.0502
- 628 days (observed match)
- Synthesized PCM export
- 22,050 Hz · 16-bit mono .WAV