Inmarsat signalling-unit log for 9M-MRO
Perth Ground Earth Station · 7–8 March 2014
The table of channel, BTO, BFO and message type that underpins every arc on every search map. Released by Malaysia with Inmarsat notes.
Malaysia released a readable extract of the Inmarsat ground-earth-station log covering 9M-MRO from about 16:00 UTC on 7 March through the failed interrogation at 01:16 UTC on 8 March. Each line is a signalling unit, not a position report. BTO is a round-trip timing residual; BFO is a frequency residual. R600 versus R1200 channels need different BTO calibration. The SDU logged on at 18:25 UTC (Handshake 1), exchanged hourly handshakes, and sent an aircraft-initiated log-on at 00:19:29 UTC (Handshake 7). Anyone doing independent path reconstruction is reconstructing from this table.
Sources
- Explanatory Notes for Satellite Communication Logs, MH370
Related
Inmarsat signalling-unit logs for 9M-MRO
Perth Ground Earth Station · 7–8 March 2014
BTO range rings and BFO Doppler residuals
Inmarsat / Ashton et al. · Journal of Navigation
Satellite data unit logs back on
18:25:27 UTC · Handshake 1
Handshake 7 — aircraft-initiated log-on
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Last ACARS transmission
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18:39:52 UTC
Failed handshake — terminal silent
01:15:56 UTC
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