Chandrayaan-1 Mini-RF Map Projected Data Set Description

Extracted from PDS3 Data Set Catalog File.

Data Set Terse Description
==========================

Calibrated map projected 2 data products and ancillary files from the
Chandrayaan-1 Mini-RF Forerunner lunar mission.

  Data Set Overview
  =================
    This data set contains archival map-projected calibrated data acquired
    from the Mini-RF (Mini-SAR) Forerunner instrument during the
    Chandrayaan-1 mission and associated ancillary data. The Mini-RF
    Calibrated Data Archive is a time-ordered collection of calibrated
    Level 2 SAR images collected by the Mini-RF (Mini-SAR) instrument
    during the Chandrayaan-1 mission to the Moon. They are provided in an
    oblique cylindrical map projection. They also contain stokes parameters
    files, polarization ratio files, a radar albedo file, and a browse
    image.

  Parameters
  ==========
    See individual SIS documents, which are located in the DOCUMENT
    collection, for detailed descriptions of each file contained in this
    data archive.

  Processing
  ==========
    The Level 2 burst mode data products are CDRs that the POC produces by
    ingesting the Level 1 CDRs into the Level 2 SAR processor. The Level 2
    CDRs differ from the Level 1 products in that they are orthorectified
    and are re-sampled into oblique cylindrical map projections. The
    'equator' of the map projection will correspond to the line of
    longitude that the subspacecraft point crossed at the equator before
    the data collection. A full PDS label accompanies each data file and
    gives a detailed description of the content and format.

  Data
  ====
    These data are stored in the DATA/SAR/<orbit>/LEVEL2 directory on
    archival volumes. File names are described in MRFFR_DP_SIS.PDF.

    These products are map-projected calibrated single swath CDR image
    data. The science product in an oblique cylindrical projection. There
    is one file for north polar pass and another for the south polar pass.
    Each pixel is represented by two 4-byte floating point values and an 8-
    byte complex value (one 4-byte floating point real and one 4-byte
    floating point imaginary value) for a total of 16 bytes per pixel. The
    first two numbers are the intensity images for H and V receive,
    respectively. The complex value is the cross power intensity image
    between the H & V receive.

    All Level 2 CDR image products are each accompanied by four stokes
    parameters files. Mini-RF transmits a right circular polarized signal,
    and receives Horizontal and vertical polarized signals, and the phase
    between the polarizations. The Level 2 file consists of four pieces of
    information per pixel. The received power on the horizontal
    polarization (ERH), the received power in the vertical polarization
    (ERV) and the real and imaginary portions of the cross product between
    the two polarization signals (Re ERH ERV* & Im ERH ERV* ).

    The four stokes parameters (S1, S2, S3, and S4) are related to the data
    in the level 1 files by the following equations:

    S1   =   ERH + ERV
    S2   =   ERH - ERV
    S3   =   2 Re  ERH ERV*
    S4   =   -2 Im  ERH ERV*

    These data are stored in the DATA/SAR/<orbit>/LEVEL1 directory on
    archival volumes. File names are described in MRFFR_DP_SIS.PDF.

  Ancillary Data
  ==============
    An extensive set of ancillary files is needed for proper analysis and
    interpretation of the derived data. Users should refer to the INDEX.TAB
    listing to locate ancillary files and to the Mini-RF data product SIS
    for data formats and naming conventions.

  Coordinate System
  =================
    The lunar body-fixed frame used by the Mini-RF investigation is
    referenced to the Moon Principle Axis (PA) coordinate system, as
    realized using NASA's SPICE products (Frames Kernel).

  Software
  ========
    No software is included with this archival data set.

  Review
  ======
    This archival data set was reviewed by the Mini-RF Team prior to
    submission to the Planetary Data System (PDS).

    Prior to creation of the final version of the archival data set, key
    elements of the archive were distributed for preliminary review. These
    included electronic versions of example PDS labels, CATALOG files, and
    Software Interface Specifications. These materials were distributed to
    PDS personnel, the experiment investigator, and others, as appropriate.

  Reference
  =========
    Nozette, S., P. Spudis, B. Bussey, K. Raney, H. Winters, C. L.
    Lichtenberg, W. Marinelli, J. Crusan, and M. Gates, The LRO Miniature
    Radio Frequency (Mini-RF) technology demonstration, Space Sci. Rev.,150,
    285–302 (2010), https://doi.org/10.1007/s11214-009-9607-5.