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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.





Table 6.63

Level 0 MDSR

# 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)
Record Length : 31

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:

Table 6.64

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

TOTAL






20






Note 2 - This field uses the same definition as the Packet Length field of the Packet Header.