What this site is

A telemetry dashboard for the MSU SSEL REAL CubeSat mission (Relativistic Electron Atmospheric Loss).

Live Beacons

HEALTH and TIME beacon frames decoded in real time from SatNOGS observations and direct MSU ground-station passes. HEALTH frames carry battery / EPS / OBC / temperature / radio fields. TIME frames carry onboard clock / TAI / GPS-time fields.

Backorbit LDT

Higher-fidelity HEALTH and XACT frames stored onboard between passes and downlinked as backorbit telemetry. HEALTH plots use the onboard ONBOARD_TIMESTAMP counter; XACT plots use tai_utc or the onboard MET counter (counters are placed on the time axis through the measured clock model, so their UTC is an estimate). Receive and file timestamps are never plot clocks.

XACT

The attitude-control / orbit subset of LDT data: ECI position + velocity, attitude quaternion, body rates, star-tracker, GPS fix, ADCS mode, momentum, sun-vector, and reaction-wheel state.

Pass detection

Frames separated by more than ~30 min are considered separate passes. The LDT view defaults to plotting the most recent decoded pass. You can step backwards with the pass picker, or override to a free-form date range.

Limit bands (RL / YL / Nom / YH / RH)

Where the bus packet layout defines safe operating limits, the chart draws them as horizontal lines:

• RL / RH — red dashed, hard low / high limit
• YL / YH — yellow dotted, soft warning low / high
• Nom — green dash-dot, nominal value

Limits come straight from the REAL bus packet layout — the same field definitions the decode pipeline uses.

Two capture pipelines, one merged LDT product

REAL backorbit telemetry is captured two ways, then merged into a single source of truth:

• The SatNOGS pipeline decodes frames heard by the public SatNOGS ground-station network.
• The MSU .dat parser decodes raw captures from the MSU groundstation.

Because both hear the same satellite, the same frame is often captured twice. The unified LDT product de-duplicates byte-identical frames and keeps every unique one, tagging each row with where it came from (source_pipeline = SatNOGS, MSU .dat, or both) plus a redundancy_status cross-check. The Anomaly Overview uses this to show the complete attitude-anomaly map from the merged product at once, with source-path indicators on the points. Rejected packets stay listed per capture path, since a rejection only means something next to the pipeline that produced it.