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Sigindex common2 #502

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Sigindex common2 #502

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Commits on Oct 28, 2024

  1. Index signal specific data using the signal code 

    Rather than the signal frequency index which is still used in the
observation structure to keep that compact.

When there are many signals the set of signals can change and when the
priorities are recomputed the frequency index can change so the
frequency index is not a reliable key for this state. This is not an
issue with just one signal, or perhaps two, but with more than NFREQ
signals there were subtle issues as the priories changed and the state
was mixed up.

There are a good few structures with just one array of data for each
signal and these have been expanded from being NFREQ+NEXOBS to MAXCODE
so that the signal code can be used as the index. This is a little
wasteful of memory but simple.
    @ourairquality
    ourairquality committed Oct 28, 2024
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  2. rtcm3: implement lock time slip checking 

    Support determining the reported lock time from the lock time
indicators. Calculate the time since the last observation (per
signal). Use these to also check for a possible loss of lock. A slip
might now be reported on an outage.

Special case for receivers (Septentrio) that send a lock time
indicator of zero on a half cycle ambiguity. Consider these as an
outage deferring the decision to flag a slip until the signal
returns. For a short period of half cycle ambiguity that recovers, a
slip report might now be avoided.

The functions for converting the lock time indicator to a time also
support returning the time increment to the next indicator value. This
was not found to be needed.

Fix the observation flushing after a sync, which had been guarded by
the max obs overflow check so that once the max obs limit was reached
it was stuck.
    @ourairquality
    ourairquality committed Oct 28, 2024
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  3. sigindex: common function to resolve the frequence index 

    The frequency index returned by code2idx() is not unique and conflicts
need to be resolved. There were different implementations across the
code, RINEX, RTCM, and the raw receiver decoders. Add a common
exported function to implement this resolution.

sigindex(..., opt) allocates an frequency index given a signal code,
returning the allocated signal index on success of -1 on failure.
Conflicts are resolved using the signal priorities that can be
modified by the options in the opt argument, moving an existing
allocation if necessary.

sigindex(..., NULL) uses the same search algorithm as sigindex() but
does not allocate a new entry or check the consistency of code
priorities. Without the signal priorities, with the opt argument NULL,
the allocation ordering could not be determined, so this case is used
for this non-allocating variant.

Apply this resolution per satellite as the set of signals can vary
between satellites.

Update the RINEX, RTCM3, Unicore and Novatel format decoders to use
this new common function.
    @ourairquality
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