document what we send to influx

influxdb.md

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+InfluxDB schema
+---------------
+
+Influxdb knows about *measurements* which live in a database. Each
+measurement has multiple values. Such values can be tagged, and each set of
+tags forms a series.
+
+Our schema is not yet very consistent, but this documentation is a start.
+
+Measurements
+------------
+These measurements are tagged by gnssid, sv and sigid. Sigid represents the
+band on which this data was received.
+
+
+ * ephemeris, updated every frame (so, a lot)
+   * iod-live: current IOD number
+   * eph-age: age of this ephemeris (distance from t0e)
+ * sisa, updated every frame
+   * value: raw Galileo SISA value
+ * gpsura, updated every frame
+   * value: raw GPS URA value
+ * FT, GLONASS specific FT value (SISA)
+ * clock, clock information, updated every frame
+   * offset\_ns: time offset of this clock wrt GST/GPS time/Beidou time
+   * t0c: t0 of the clock parameters
+   * af0, af1, af2: clock polynomial parameters, in Galileo raw units, even for non-galileo SVs
+ * clock\_jump\_ns
+   * value: number of nanoseconds jump in clock correction from this
+     ephemeris to the previous one
+ * iono, ionospheric parameters
+   * ai0, ai1, ai2: Galileo NeQuick parameters
+   * sf1-sf5: The as yet unused 'storm flags'
+ * galbgd, Galileo Broadcast Group Delay
+   * BGDE1E5a in raw galileo values
+   * BGDE1E5b in raw galileo values
+ * galhealth, Galileo-specific health bits, values according to ICD
+   * e1bhs
+   * e5bhs
+   * e1bdvs
+   * e5bdvs
+ * gpshealth, GPS-specific health bits
+   * value
+ * beidouhealth, BeiDou-specific health bits
+   * sath1
+ * glohealth, GLONASS-specific health bits
+   * Bn
+ * glo\_taun\_ns, GLONASS-specific TauN 
+   * value, in nanoseconds
+ * FT, GLONASS specific FT value
+ * utcoffset, for GPS, Galileo, Beidou
+   * a0, in Galileo units
+   * a1, in Galileo units
+   * delta, in nanoseconds
+   * t0t, in seconds
+ * gpsoffset, for Galileo, BeiDou does not fill this out. GPS doesn't need to
+   * a0g, in Galileo units
+   * a1g, in Galileo units
+   * delta, in nanoseconds
+   * t0g, in seconds
+ * eph-disco, statistics about ephemeris transitions
+   * x,y,z: ECEF coordinates according to new ephemeris at new t0e
+   * oldx,oldy,oldz: ECEF coordinates according to old ephemeris at new t0e
+   * iod, oldiod: new and old IOD
+
+Observer measurements:
+
+ * fix
+   * x,y,z: ECEF coordinates of receiver
+   * lat, lon: degrees latitude and longitude
+   * h: hight above WGS84 ellipsoid
+   * acc: accuracy (meters)
+   * groundspeed: m/s
+ * observer\_details
+   * clock\_offset\_ns: receiver reported internal clock offset
+   * clock\_drift\_ns: drift rate, ns/s
+   * clock\_acc\_ns: clock accuracy (ns)
+   * freq\_acc\_ps: picosecond/s frequency accuracy
+   * uptime: uptime in seconds
+
+
+Observer and SV measurements:
+
+ * rfdata
+   * carrierphase
+   * doppler (Hz)
+   * locktime (milliseconds)
+   * pseudorange (meters)
+   * prstd (pseudorange standard deviation)
+   * dostd (doppler standard deviation)
+ * correlator
+   * delta\_hz\_corr: Doppler residual against active ephemeris, corrected for
+     receiver clock drift
+   * delta\_hz: Doppler residual, uncorrected
+   * elevation: Elevation of SV over horizon
+   * prres: pseudorange residual according to receiver
+   * qi: 0-7, quality indicator according to receiver
+   * hz: Doppler Hz offset reported by receiver (uncorrected)
+ * recdata
+   * db: receiver reported dB (can be non-sensical)
+   * azi: calculated azimuth for SV from this receiver
+   * ele: calculated elevation for SV from this receiver
+   * prres: pseudorange residual according to receiver
+   * qi: 0-7, quality indicator according to receiver
+