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Carles Fernandez
08d24faa9d
Follow-up to the galileo-navtype-fallback merge. The original fallback let E5a/E5b/E6 observations use the other service's ephemeris, but the BGD index for those signals is fixed by frequency, so an E5a range modeled with an I/NAV clock would be off by BGD(E1,E5a) - BGD(E1,E5b). Only E1 selects its BGD from the ephemeris clock model, so only E1 may fall back. Drop the per-PRN locked set: I/NAV and F/NAV carry the same IODnav/toe, so they expire together, and an E1 switch between services costs only BGD quantization. select_galileo_ephemeris() is const again and simply prefers the primary service while its ephemeris is fresh. Also normalize a legacy Unknown provenance to the primary service on the returned ephemeris, and allow E1 Reduced CED in F/NAV-primary receivers.