Navigation:  Missions and Instruments > Mars Reconnaissance Orbiter > SHARAD >

SHARAD Experiment Data Record (EDR)

Previous pageReturn to chapter overviewNext page

EDR – Experiment Data Record

 

Instrument: Shallow Radar

PDS Data Set ID: MRO-M-SHARAD-3-EDR-V1.0

For more information about SHARAD EDRs, see the SHARAD EDR SIS.

 

The Shallow Radar (SHARAD) Experiment Data Record (EDR) for SHARAD is a data product produced by the Italian SHARAD team that consists of the instrument telemetry correlated with the auxiliary information needed to locate observations in space and time and to process data further.  Apart from editing of data to remove duplicates and transmission errors, no processing is applied to the scientific data of the instrument.

 

Each Data Product contains data from one or more data blocks collected continuously using the same operation mode, instrument status and on-board processing scheme; that is, using a single Operation Sequence Table (OST) line.  The content of each SHARAD data product is highly variable in terms of number of data blocks, and depends on how operations for the instrument were planned during a given data collection period.  The natural organization for data blocks within a Data Product is a table, in which each line contains data from a single data block, and each column contains the value of a single parameter or time sample across different data blocks.

 

Each Data Product consists of three files:

1)A binary file containing the scientific telemetry of the instrument.  This is a sequence of echoes, each of which is preceded by a header containing information on the collection and on-board processing of the data.  This file is called the Science Telemetry file.
2)A binary table containing geometric quantities generated on-ground from spacecraft navigation data, parameters extracted from instrument and spacecraft housekeeping telemetry, and flags describing the completeness and usability of the associated scientific telemetry.  This file is called the Auxiliary Data file and contains one record for every data block in the Science Telemetry file.
3)A detached ASCII label file describing the content of the data product.  The label is written according to standards defined by the Planetary Data System (PDS), and lists parameters describing both the observation in which data were acquired and the structure of the files in which data are stored.

 

SHARAD EDR products have the following file names:

E_nnnnnnn_mmm_aabb_ppp_v_t.DAT (with one detached PDS label for both binary tables)

where:

nnnnnnn = transaction ID, 0000000-9999999, 7-digit number associated with the ID contained in the Instrument Raw Science Product filename from which the EDR is produced, the first five digits correspond to the number of the orbit in which data were acquired, while the last two digits denote the number of the OST that was used during data acquisition

mmm = OST line #, 000-999, 3-digit number the OST line being used during data acquisition

aa = operative mode

RO = receive only

SS = sub-surface sounding

bb = 2-digit number, 01-21, associated with the number of pre-summed echoes in a data block and to the bit resolution of each sample, see table below

ppp = 3-digit number corresponding to the integer part of the Pulse Repetition Frequency (PRF) value used in acquiring data

335 = 335.12 Hz

350 = 350.14 Hz

387 = 387.60 Hz

670 = 670.24 Hz

700 = 700.28 Hz

775 = 775.19 Hz

v = version, A-Z

t = table type

a = auxiliary data

s = science telemetry

 

In ODE, EDR products have the following product IDs:

E_NNNNNNN_MMM_AABB_PPP_V

 

Table of Operative mode 2-digit numbers

Instrument Mode

Number of Pre-summed Echoes

Bits per Sample

01

32

8

02

28

6

03

16

4

04

8

8

05

4

6

06

2

4

07

1

8

08

32

6

09

28

4

10

16

8

11

8

6

12

4

4

13

2

8

14

1

6

15

32

4

16

28

8

17

16

6

18

8

4

19

4

8

20

2

6

21

1

4