Chandrayaan-1 Mini-RF Calibrated Data Set Description

Extracted from PDS3 Data Set Catalog File.

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

Calibrated calibrated data records and ancillary files from the Mini-RF
(Mini- SAR) Forerunner lunar mission.

  Data Set Overview
  =================
    This data set contains archival calibrated burst mode data acquired from
    the Mini-RF (Mini-SAR) instrument during the Chandrayaan-1 mission and
    associated ancillary data. The Mini-RF Calibrated Data Archive is a time-
    ordered collection of calibrated Level 1 SAR images collected by the
    Mini-RF instrument during the Chandrayaan-1mission to the Moon. They also
    contain stokes parameters files, polarization ratio files, 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 POC produces calibrated (Level 1) SAR CDRs by ingesting the Level 0
    EDRs and associated Level 0 ancillary files into the SAR processor
    (Level 0 data are intermediate products generated from raw (PDR)
    products. Level 0 data are not archived in PDS). Calibration is
    applied. A full PDS label accompanies each data file and gives a
    detailed description of the content and format.

  Data
  ====
    The Level 1 CDRs are SAR images in range and azimuth orientation with
    pixel values in beta naught, which have been radiometrically and
    polarmetrically calibrated. Each cross-product image file contains
    simple lines of pixels. Each pixel consists of four 4-byte floating
    point numbers for a total of 16 bytes. The first two floating point
    numbers are the image intensity values for the horizontal (H) and
    vertical (V) channel receive. The second two numbers are the real and
    imaginary parts of the single complex number which gives the cross
    power intensity image between the H & V receive. H & V represent the
    complex amplitudes of the horizontal and vertically polarized
    backscatter respectively. An '*' represents a complex conjugate of H or
    V.  The Level 1 products are the lowest level usable science data
    products.

    All Level 1 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 1 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
  ==============
    Each science product is accompanied by a text metadata file that
    contains the parameters that describe the state the instrument was in
    at the time of data collection and location and timing information
    about the data set. This file is referenced in the PDS label associated
    with the science data product.

  Calibration Data
  ================
    Calibration files produced by the Vexcel(TM) CalPro processor are
    included with the Level 1 data set. Consult the Mini-RF Calibration
    Plan included in the DOCUMENT collection of this archive and the
    instrument description file for details.

  Coordinate System
  =================
    Level 1 data products are not dependent on definition of a
    coordinate system.

  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.