DATA_SET_DESCRIPTION |
Data Set Overview
=================
The Juno MWR EDR data sets will ultimately include all uncalibrated MWR
science data records for the entire Juno mission. This volume will
contain only those data obtained during the orbital phase of the Juno
mission, when this phase of the mission is completed. These data com-
prise the raw data that address the primary objectives of the Juno
mission. They consist of data obtained at the full MWR data rate during
a five-hour period around each perijove pass, and data obtained at
all other times for the purpose of instrument calibration and perform-
ance monitoring. This volume consists of reformatted and uncalibrated
data records. The reformatting operation reassembles received instrument
data packets into one-hour-long records of time-ordered data correspond-
ing to 100-ms observations made by the MWR instrument. This data set is
intended to preserve the full content of the uncalibrated instrument
packets and is to be used only as a last resort. The level 3 MWR
archived data are designed to be complete and more easily used.
The primary usefulness of these data lay in preserving the inputs to
higher level calibrated data sets so that such sets may be regenerated
in the event that better calibrations become available or in the event
that mistakes are uncovered in the data processing pipelines. In
either event the MWR instrument team is intended as the user of these
data, *not* the wider scientific community.
Parameters
==========
The fundamental unit of this data set comprises the data obtained
during a single 100-ms observation made by the MWR instrument. Each
observation does not include all of the MWR instrument parameters
required for its calibration, some of which must be interpolated from
neighboring observations. Actually producing calibrated data from these
raw data requires detailed knowledge of the MWR instrument.
Processing
==========
The data included in this volume were processed by the EDR processing
pipeline as described in section 2.3 of the VOLSIS document found under
the DOCUMENTS subdirectory. In short, this pipeline consists of
programs which reassemble fragmented packets, decompress packets and
check for CRC errors.
Data
====
Products in this data set consist of files of time-ordered data
corresponding to observations of 100-ms duration each. These are
received from the instrument in time-contiguous units of ten
observations each, with one unit then corresponding to one second's
worth of observation. Successive units may be contiguous in time (full
data rate) or separated by n seconds each (reduced data rate). These
units are then assembled into contiguous files of one hour length
regardless of data rate. Each IRDR and GRDR file has its associated
label file, which in total comprise one data record. The details of the
collection and formatting of these files is described in Sections 2 and
3, and in Appendix B, of the VOLSIS document found under the DOCUMENTS
subdirectory.
Ancillary Data
==============
This data set is complete, although the generation of higher level
calibrated data from this raw data set requires the SPICE toolkit
and Juno mission SPICE kernels from the Navigation and Ancillary
Information Facility (NAIF) along with calibration data from pre-launch
measurements and cruise.
Coordinate Systems
==================
As these are raw data they are recorded without reference to any
coordinate system. Pointing information is contained in the level 3
data (specifically, in the geolocation reduced data records, or GRDRs).
Software
========
No software is provided to view, interpret, or convert this data set.
All files are in ASCII format, however, and are readily readible
through standard programs such as textedit, Microwave Excel and Word,
etc.
Media/Format
============
This data set is provided to the Planetary Data System by the Juno
Science Operation Center (JSOC) as described in section 5.2 of the
VOLSIS document found under the DOCUMENTS subdirectory.
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