PDS_VERSION_ID                   = PDS3
RECORD_TYPE                      = STREAM

OBJECT                           = DATA_SET
DATA_SET_ID                      = "LP-L-ENG/GRS/NS/APS/MAG/ER-1-MDR-V1.0"

OBJECT                           = DATA_SET_INFORMATION
DATA_SET_NAME                    = "LP MOON MERGED TELEMETRY DATA V1.0"
START_TIME                       = 1998-01-05
STOP_TIME                        = UNK
DATA_OBJECT_TYPE                 = "TABLE"
DATA_SET_RELEASE_DATE            = 1998-06-01
PRODUCER_FULL_NAME               = "ALAN B. BINDER"
DETAILED_CATALOG_FLAG            = "N"
DATA_SET_COLLECTION_MEMBER_FLG   = "N"
DATA_SET_DESC                    = "

Data Set Overview
=================

The Lunar Prospector merged telemetry data set is a result of
comparing the two Lunar Prospector telemetry data streams and
selecting one of them.  The Lunar Prospector raw telemetry data
downlink stream contains data transmitted in real-time and data that
was collected about 50 minutes prior and stored on the spacecraft.
The purpose of the delayed stream is to capture data acquired during
communications blackouts.  See the CONFIDENCE_LEVEL_NOTE field for a
description of the merging process.

The merged telemetry data set contains raw science and instrument
engineering data acquired by all of the science instruments (Gamma
Ray, Neutron, and Alpha Particle Spectrometers, and the Magnetometer
and Electron Reflectometer), along with spacecraft engineering data.
As such, the merged telemetry files are part of the Lunar Prospector
Level 0 data archive.  The data set is organized into binary files
with each file containing about 4-6 hours of data.  Each record in a
given file is a main (minor) frame containing 2 seconds of downlinked
data.  A major frame consists of 16 minor frames.
 
Science Objectives
==================

The Lunar Prospector science objectives relevant to this data set are
to map the Moon's surface composition and its magnetic field, and to
determine the frequency and location of gas release events.  A special
emphasis of the science objectives is to search for polar water ice
deposits [BINDERETAL1998]. "
 
 CONFIDENCE_LEVEL_NOTE           = "
 
Confidence Level Overview
=========================

The merging process compares each minor frame of the real-time and
delayed data streams.  When mismatches occur between the two data
streams, the data stream with the highest signal-to-noise ratio is
chosen for storage in the merged file.  When there are no mismatches,
the real-time data stream is chosen.  When mismatches occurs between
the two streams, and the signal-to-noise ratios are the same, the
real-time stream is selected.  Where there is only one data stream for
a given time, that stream is stored in the merged file.  Each minor
frame (i.e., each record in a merged telemetry file) has a flag to
indicate which stream was selected and which criteria was used for the
selection.

Data Coverage and Quality
=========================

Science data are acquired continuously by the Lunar Prospector science
instruments.  Over time, the entire lunar surface is covered from the
circular polar orbit of the spacecraft.  However, data gaps can occur
in the merged telemetry data files.  The times of these data gaps are
documented in a log file included with the level 0 archive.  "
 
 END_OBJECT                       = DATA_SET_INFORMATION

 OBJECT                           = DATA_SET_TARGET
 TARGET_NAME                      = MOON
 END_OBJECT                       = DATA_SET_TARGET
 
 OBJECT                           = DATA_SET_HOST
 INSTRUMENT_HOST_ID               = LP
 INSTRUMENT_ID                    = {GRS, NS, APS, MAG, ER}
 END_OBJECT                       = DATA_SET_HOST

 OBJECT                           = DATA_SET_REFERENCE_INFORMATION
 REFERENCE_KEY_ID                 = "BINDERETAL1998"
 END_OBJECT                       = DATA_SET_REFERENCE_INFORMATION

END_OBJECT                        = DATA_SET
END