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6.6.24 Level 0 MDSR
The Level 0
Measurement Data Set
(MDS) will consist of a series of Annotated Instrument Source
Packets (AISPs) . The annotation
consists of the header added to the ISP by the Front End Processor
(FEP) plus the sensing time added by the Level 0
processor, as converted from the Satellite
Binary Time (SBT) counter embedded in each ISP.
This stamp allows for later extraction of
specific regions of the MDS.
The exact contents of the Level 0
MDSRs is instrument and mode specific, however
it will follow a common structure as shown below.
|
#
|
Description
|
Units
|
Count
|
Type
|
Size
|
|
Data Record
|
|
0
|
dsr_time
MJD of sensing
time as extracted from Aisp |
MJD |
1 |
mjd |
12 byte(s) |
|
1
|
gsrt
Ground station
reference time |
MJD |
1 |
mjd |
12 byte(s) |
|
2
|
isp_length
Length of the isp
= length of the source packet -
7 bytes |
bytes |
1 |
us |
2 byte(s) |
|
3
|
crc_errs
Number of VCDUs in
the isp which contain a CRC error |
VCDU |
1 |
us |
2 byte(s) |
|
4
|
rs_errs
Number of VCDUs in
the isp for which an RS
correction was performed |
VCDU |
1 |
us |
2 byte(s) |
|
5
|
spare_1
spare |
- |
1 |
SpareField |
2 byte(s) |
|
6
|
source_packet
downlinked source packet |
- |
1 |
source_packetStruct |
-1.0 byte(s) |
|
|
a
|
Isp_Fields
Instrument
Source Packet |
- |
|
uc |
1 byte(s) |
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DS_NAME : Level 0 MDSR
Format Version 114.0
Front End Processor (FEP) Annotations
The FEP annotations describe the quality of the
ISP reconstruction process.
The FEP Header will follow the structure
shown below:
|
Field #
|
Description
|
Units
|
Byte length
|
Data
Type
|
|
1
|
MJD 2000 Time Stamp
Ground
Station Reference Time of reception.
Refer to --broken link-- for format information.
|
MJD
2000
|
12
|
s1
2*ul
|
|
2
|
Length
of ISP = (length of source packet
excluding 6 byte header)-1
(see Note: 2 below ) |
bytes
|
2
|
us
|
|
3
|
Number
of VCDU s in the ISP
which contain a CRC error
As
identified by a failed Cyclic
Redundancy Code check.
|
VCDU
|
2
|
us
|
|
4
|
Number
of VCDUs in the ISP for which a
Reed-Solomon error correction was performed
|
VCDU
|
2
|
us
|
|
5
|
Spare
(set to zero)
|
-
|
2
|
2*uc
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TOTAL
|
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20
|
|
Note 2 - This field uses
the same definition as the Packet Length
field of the Packet Header.
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Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,
atmospheric chemistry
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