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NASA Space Science Data Coordinated Archive Header

JUNO OUTER CRUISE RAW GRAVITY SCIENCE 1 V1.0 (PDS)

NSSDCA ID: PSPA-00605

Availability: Archived at NSSDC, accessible from elsewhere

Description

This description was generated automatically using input from the Planetary Data System.

Data Set Overview

The Juno (JUNO) Outer Cruise (OC) Gravity Science (GS) Raw Data Archive (RDA) is the set of raw and partially processed radio science data collected during between the October 2013 Earth Flyby and July 2016 Jupiter Orbit Insertion. The OCRU in the DATA_SET_ID stands for OUter CRUise. The earliest data in this data set were collected on 2013-10-11 Although the Juno spacecraft supports both X-band and Ka-band uplink and downlink, the archive is primarily composed of X-band ODF tracking data. During Ka-band passes, TNF tracking data and open-loop RSR data are collected. Enhanced AMC calibration data may also be available during Ka-band tracks. All X-band Doppler and Range data are provided in the ODF directory in yearly files. Ka-band data are provided as individual files on a per-track basis. Days where Ka-band tracking occured using the new 350W Ka-band transmitter were: Year Day of Year Ka-band Tracking Mode ---- ---------- --------------------------------2015 041 1-Way Ka-down, 2-Way X-up/Ka-down 049 1-Way Ka-down 056 1-Way Ka-down, 2-Way Ka-up/Ka-down 064 1-Way Ka-down, 2-Way Ka-up/Ka-down 071 1-Way Ka-down, 2-Way Ka-up/Ka-down 103 1-Way Ka-down, 2-Way Ka-up/Ka-down 124 1-Way Ka-down, 2-Way Ka-up/Ka-down 254 1-Way Ka-down, 2-Way Ka-up/Ka-down 268 1-Way Ka-down, 2-Way Ka-up/Ka-down 2016 027 1-Way Ka-down 055 1-Way Ka-down, 2-Way Ka-up/Ka-down 081 1-Way Ka-down, 2-Way Ka-up/Ka-down 109 1-Way Ka-down, 2-Way Ka-up/Ka-down The closed-loop system used a phase-lock loop in the ground receiver to track the downlink signal, reporting both amplitude and frequency at rates typically of 1-10 times per second. Closed-loop data are efficient for characterizing slowly changing signals and are the input to operational navigation and orbit-determination processes. The data set includes three primary data types. Tracking and Navigation Service Data Files (TNFs) are the most primitive (and most voluminous) product of the closed-loop system. Orbit Data Files (ODFs) are compressed versions of TNFs, specifically targeted to spacecraft navigators and scientists interested in gravity fields. Radio Science Receiver records (RSRs) are the primary data type from the open-loop system. Typical users of these data might analyze range and Doppler measurements in ODFs to reconstruct the spacecraft trajectory or determine the noise level. Relevant questions would include the measurement uncertainties in range and Doppler at different DSN antennas; the uncertainties could set constraints on any model of Jupiter's gravity field developed later, for example. The TNF data are generally reserved for use in more sophisticated investigations or where information beyond what is available in the ODF may be required. For example, the TNF contains the phase of the transmitted and received signals whereas the ODF focuses mainly on the frequency. RSR data were collected during tracks dedicated to Radio Science when Ka-band is enabled on the spacecraft.

Parameters

The TNF is the primary output from the DSN closed-loop system. In the TNF about 20 record types are defined, each designed for a particular audience, although it was frequently the case that users needed more than one record type. The emphasis of the data is on phase of the transmitted and received signals. Each TNF is accompanied by a PDS minimal label which points to a software specification document (TNF_SIS.TXT) in the DOCUMENT directory of the archive for detailed descriptions of the records and fields. The ODF is a minimally processed output of the closed-loop receiver. It contains the most important information (range, Doppler and frequency ramps) needed by spacecraft investigators, 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 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) PRA planetary operational discrete spectrum range (range units) SRA planetary operational discrete spectrum range (range units) RE(GSTDN) range (nanoseconds) Azimuth angle (degrees) Elevation angle (degrees) Hour angle (degrees) Declination angle (degrees) Radio Science Receiver (RSR) records contain samples of open loop receiver output; the samples are complex and can have 1-16 bits in both the in-phase (I) and quadrature (Q) components, depending on sampling rate and precision requested. Sampling rates between 1 ksps and 16 Msps may be requested. Each RSR file is accompanied by a full PDS label which describes both the format and the content at the bit level.

Processing

Typical TNFs contained data from a 24-hour period, combining data from several antennas if there were multiple passes in one day. The files archived for Juno were not screened for 'bad' points. ODFs are abstracted from subsets of TNF data, the uncompressed output of the closed-loop receiver at the Deep Space Network. A full PDS label accompanies each ODF file and gives a bit level description of the content and format.

Data

The data set contains primary data and secondary data. Primary data are those files which would normally be used to derive science products and investigation results. Ancillary data are needed for the processing or interpretation of primary data but are not usually considered to have science value of their own. For gravity science, there are two types of primary data. Listings of primary and secondary files can be found in INDEX/INDEX.TAB for the data set (as of the most recent delivery). TNFs contain the most primitive (and most voluminous) output from the closed-loop radio science system; they are stored in the TNF directory. They have file names of the form GRV_PPPP_yyyyddd_hhmmXuuwCtttVnn.TNF where 'PPPP' identifies the data set; 'yyyy' is the four-digit year, 'ddd' is the three-digit day-of-year, 'hh' is the two-digit hour, and 'mm' is the two-digit minute at the beginning of the file; 'X' indicates an X-Band uplink ('N' denotes no uplink); 'uu' indicates the uplink station (set to 'NN' for no uplink or 'MM' for two or more uplinking stations during the time interval covered), 'w' indicates the downlink mode ('1', '2', '3', or 'M' for 1-way, 2-way, 3-way, or 'multiple', respectively), 'Cttt' indicates the Doppler count time in seconds (for example, 'C001' is a 1-second count time and 'CMMM' indicate multiple or unknown count time), and 'Vnn' indicates the version number of the file. A detached PDS minimal label accompanies each TNF; label files have names of the form GRV_PPPP_yyyyddd_hhmmXuuwCtttVnn.LBL. TNFs in this data set were usually generated at a 1-second sampling rate. A typical TNF contains about 110 MB. ODFs are stored in the ODF directory. ODFs contain the output of the closed-loop tracking system of the Deep Space Network. File names are GRV_PPPP_yyyyddd_hhmmXuuwCtttVnn.ODF where 'PPPP' identifies the data set; 'yyyy' is the four-digit year, 'ddd' is the three-digit day-of-year, 'hh' is the two-digit hour, and 'mm' is the two-digit minute at the beginning of the file; 'X' indicates an X-Band uplink ('N' denotes no uplink); 'uu' indicates the uplink station (set to 'NN' for no uplink or 'MM' for two or more uplinking stations during the time interval covered), 'w' indicates the downlink mode ('1', '2', '3', or 'M' for 1-way, 2-way, 3-way, or 'multiple', respectively), 'Cttt' indicates the Doppler count time in seconds (for example, 'C001' is a 1-second count time and 'CMMM' indicate multiple or unknown count time), and 'Vnn' indicates the version number of the file. A detached PDS minimal label accompanies each TNF; label files have names of the form GRV_PPPP_yyyyddd_hhmmXuuwCtttVnn.LBL. The typical ODF contains about 3 MB. Yearly ODFs are 30-100 MB. RSR data files are stored in the RSR directory. RSR files have the form GRV_PPPP_yyyyddd_hhmmXuuDddBBBVnn.RSR where 'PPPP' identifies the data set, 'yyyyddd' identifies the starting year and day of year, 'hhmm' identifies the start time, in UTC, 'X' denotes the uplink band (X = X-band, K=Ka-band), 'uu' denotes the uplink DSS ID, 'D' denotes the downlink band, 'dd' denotes the downlink DSS ID, 'BBBB' indicates the recording bandwidth (001K = 1 kHz, 100 = 100 kHz, 001M = 1 MHz, etc), and 'Vnn' indicates the version number of the file. Dates and times in the file name are UTC. The file is accompanied by a PDS label with the form GRV_PPPP_yyyyddd_hhmmXuuDddBBBVnn.LBL. A typical RSR file recorded at 1 ksps over a standard 8 hour track is 100 MB.

Ancillary Data

An extensive set of ancillary files is needed for proper analysis and interpretation of the data. In the paragraphs below 'yyyyddd_yyyyddd' gives the start and end dates of the data in the file, 'Vnn' gives the version number of the file and 'PPPP' gives the data set identification. All dates in the file names unless otherwise specified are UTC dates. Earth Orientation Parameter Files (EOP Directory) --------------------------------------------------Earth Orientation Parameter files are ASCII files produced by the Tracking System Analytic Calibration (TSAC) Group at JPL. File names have the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.EOP. Each EOP file is accompanied by a PDS minimal label with file name GRV_PPPP_yyyyddd_yyyyddd_Vnn.LBL. Typical file size is 1 MB. Advanced Media Calibration Files (AMC Directory) --------------------------------------------------The Advanced Media Calibration files are produced by the Radio Science Systems Group and provide corrections to DSN tracking data at DSS-25. Files have the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.AMC. Each AMC file is accompanied by a PDS label with the file name having the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.LBL. Typical file size is 80 kB. Ionosphere Calibration Files (ION Directory) --------------------------------------------------Ionosphere Calibration files are ASCII files produced by the Tracking System Analytic Calibration (TSAC) Group at JPL. They provide historical and predicted Earth ionospheric conditions. File names have the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.ION. Each ION file is accompanied by a PDS minimal label with file name GRV_PPPP_yyyyddd_yyyyddd_Vnn.LBL. Typical file size is 24 KB. Troposphere Calibration Files (TRO Directory) --------------------------------------------------Troposphere Calibration files are ASCII files produced by the Tracking System Analytic Calibration (TSAC) Group at JPL. They provide historical and predicted Earth tropospheric conditions. File names have the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.TRO. Each TRO file is accompanied by a PDS minimal label with file name GRV_PPPP_yyyyddd_yyyyddd_Vnn.LBL. Typical file size is 150 KB. DSN Weather Files (WEA Directory) --------------------------------------------------DSN Weather files were produced by the Tracking System Analytic Calibration (TSAC) Group at JPL. Files give weather calibration information for DSN complexes. These are ASCII files of variable length records. File names have the form GRV_PPPP_yyyyddd_yyyyddd_ss_Vnn.WEA, where 'ss' is the DSN complex where weather data were acquired. WEA files are typically released weekly and contain all weather data for the complex since 1 January. Each WEA file is accompanied by a PDS minimal label with file name GRV_PPPP_yyyyddd_yyyyddd_ss_Vnn.LBL. The files grow at the rate of approximately 90 KB per month. Small Forces Files (SFF Directory) --------------------------------------------------Small Forces Files were created from the Juno spacecraft engineering telemetry stream. These are ASCII files of variable length records. File names have the form GRV_PPPP_yyyyddd_yyyyddd_Vnn.SFF. Each SFF file is accompanied by a PDS minimal label with the file name GRV_PPPP_yyyyddd_yyyyddd_Vnn.LBL. The average file size is 10 KB. File format and content are described by NAV018-SFF_JPL in the DOCUMENT directory.

Relevant Data Archived At Other Sites

The Navigation and Ancillary Information Facility (NAIF) is the navigation node of the PDS. NAIF provides the archives for spacecraft navigation, attitude, events, clock conversion, and planetary ephemerides for most NASA missions. Additionally, NAIF provides the SPICE toolkit, containing useful algorithms to utilize and manipulate data NAIF provide. Relevant to gravity science are the following types: * CK: Spacecraft and solar array attitude orientation files * EK: Spacecraft events kernel * FK: Reference frame specification * SCLK: Conversion between spacecraft time and ephemeris time * SPK: Spacecraft and Planetary ephemeris data.

Software

Software for parsing, reducing, and analyzing data such as these has been developed at several institutions. Because such software must usually operate at the bit-level and is written for a narrow range of platforms, it is not suitable for general distribution. No software is included with this archival data set.

Media/Format

These data have been delivered to the PDS Atmospheres Node electronically.

These data are available on-line from the Planetary Data System (PDS) at:

http://pds-atmospheres.nmsu.edu/PDS/data/jnogrv_0001/

Alternate Names

  • JUNO-J-RSS-1-OCRU-V1.0

Discipline

  • Planetary Science: Atmospheres

Additional Information

Spacecraft

Experiments

Questions and comments about this data collection can be directed to: Dr. David R. Williams

 

Personnel

NameRoleOriginal AffiliationE-mail
Dr. William M. FolknerData ProviderNASA Jet Propulsion Laboratorywilliam.m.folkner@jpl.nasa.gov
Dr. Dustin R. BuccinoGeneral ContactNASA Jet Propulsion Laboratorydustin.r.buccino@jpl.nasa.gov
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