Lunar Prospector Merged Level 0 Data

MDR – Lunar Prospector MERGED Level 0 Data

PDS Data Set ID: LP-L-ENG/GRS/NS/APS/MAG/ER-1-MDR-V1.0

For more information about GRS, NS, APS, MAG, and ER MDR products, see the Data Product SIS.

The Lunar Prospector (LP) Merged Level 0 Data (MDR) data products contain 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. 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.

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 mismatches occur between the two streams, the real-time data stream is chosen. When mismatches occur between the two streams, and the signal-to-noise ratios are the same, the real-time stream is selected. When 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.

LP MDR products have the following file names:

Myydddhh.B (with detached PDS label)

where:

yy = 2-digit year

ddd = 3-digit day of year

hh = hour for the start of the file

In ODE, MDR products have the following product IDs:

YY_DDD_HHMM_IINN.MERGE

where:

hhmm = start time of the file

iinn = end time of the file