MESSENGER RSS Compressed version of TNF (ODF)

ODF – Compressed version of TNF

Instrument: MESSENGER Radio Science Experiment

PDS Data Set ID: MESS-V/H-RSS-1-EDR-RAWDATA-V1.0

For more information about RSS ODF Products, see the EDR Product SIS.

The Radio Science Subsystem (RSS) Orbit Data File (ODF) is a compressed version of the Tracking and Navigation File (TNF). It contains the most important information (range, Doppler and frequency ramps) needed by spacecraft navigators and investigators interested in determining gravity fields. Each ODF is accompanied by a full PDS label which describes both the content and format of the associated file.

ODF data fields include:

  • Narrowband spacecraft Very Long Baseline Interferometer (VLBI), Doppler mode (cycles)

  • Narrowband spacecraft VLBI, phase mode (cycles)

  • Narrowband quasar VLBI, Doppler mode (cycles)

  • Narrowband quasar VLBI, phase mode (cycles)

  • Wideband spacecraft VLBI (nanoseconds)

  • Wideband quasar VLBI (nanoseconds)

  • One-way Doppler (Hertz)

  • Two-way Doppler (Hertz)

  • Three-way Doppler (Hertz)

  • One-way total count phase (cycles)

  • Two-way total count phase (cycles)

  • Three-way total count phase (cycles)

  • Planetary Radioastronomy (PRA) planetary operational discrete spectrum range (range units)

  • Solar Radioastronomy (SRA) planetary operational discrete spectrum range (range units)

  • RE(GSTDN) range (nanoseconds)

  • Azimuth angle (degrees)

  • Elevation angle (degrees)

  • Hour angle (degrees)

  • Declination angle (degrees)

RSS ODF products have one of the following names:

MESS_RS_yyddd_ddd_ODF.xxx,

MESS_RS_yyddd_ttS_ODF.xxx, or

MESS_RS_yyddd_ODF.xxx

where:

yy = the year

ddd (#1) = start time day of year

ddd (#2) = stop time day of year

tt = integration period in seconds; when the _[tt]S component is absent, the integration period is 60 seconds; nearly all files have integration periods of 10 seconds or 60 seconds; during some of the early flybys, some files have 1 second integration periods; there are no ODFs with integration periods less than 1 second

xxx = file extension

DAT = binary table data file

LBL = detached PDS label file

Some ODF file names do not follow these naming conventions. Primarily around flyby events, there are additional data collected (additional antennas and receivers) which require additional terms in the name. Other formats include:

MESS_RS_yyddd_hhmm.xxx (replaces stop day with start hour and minute)

MESS_RS_yyddd_DSSnn_Dx_ttS.xxx (where nn is the Deep Space Network station number and x is the receiver number)

MESS_RS092721923_43_10S2ODF.xxx

Occasionally, additional characters indicating time [hhmm] or “NAV” may be included in the filenames to indicated a special collect.

In ODE, ODF products typically have the following product IDs:

MESS_RS_IDENTIFYING_STRING_ODF.DAT