"GBM Calc Info" (APP/LPA)

ITOS Mnemonic:  LPAGBMCALCINFO

View Options: (help)

Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Context:

Description:

The GBM shall be capable of issuing this telecommand periodically during a burst sequence to the LAT. It contains the best available calculated location and reliability parameters.

Layout:  (hide detail; help)

GBM Calc Info (GbmCalc) Telecommand Packet Format
0x	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
000	Version=0			T=1	SH	APID=0x660:1
002	SF=3		Sequence Count
004	Packet Length=39
006	0	Function Code=1
008	TRGID_TSEC tsec
00C	TRGID_USEC usec
00E	LR_SEQ seq								LR_VER ver
010	LOC_RA ra
012	LOC_DEC dec
014	TOT_ERR err
016	LOC_ALG lalg
018	EVT_CLASS class0								EVT_CLASS class1
01A	EVT_CLASS class2								EVT_CLASS class3
01C	TRG_ALG_16 talg0
01E	TRG_ALG_8 talg1								TRG_ALG_8 talg2
020	TRG_ALG_8 talg3								TRG_ALG_8 talg4
022	TRG_ALG_16 talg5
024	TRG_ALG_16 talg6
026	TRG_ALG_8 talg7[0]								TRG_ALG_8 talg7[1]
028	TRG_ALG_8 talg7[2]								TRG_ALG_8 talg7[3]
02A	TRG_ALG_8 talg7[4]								TRG_ALG_8 talg7[5]
02C	Packet Checksum

GbmCalc (pkt)
|  TRGID_TSEC tsec (fld)
|  TRGID_USEC usec (fld)
|  LR_SEQ seq (fld)
|  LR_VER ver (fld)
|  LOC_RA ra (fld)
|  LOC_DEC dec (fld)
|  TOT_ERR err (fld)
|  LOC_ALG lalg (fld)
|  EVT_CLASS class0 (fld) ... class3 (fld)
|  TRG_ALG_16 talg0 (fld)
|  TRG_ALG_8 talg1 (fld) ... talg4 (fld)
|  TRG_ALG_16 talg5 (fld) ... talg6 (fld)
|  TRG_ALG_8 talg7[0-5] (fld)

typedef struct _LPA_GbmCalc_Pkt {

    /* CCSDS header */
    char                 hdr[8];

    /* Command payload */
    LPA_GbmCalc_Prm      pay;

} LPA_GbmCalc_Pkt;

Fields:

EVT_CLASS (index)

Attribute(s):  

Brief:  "GRB Event Class"

Instance(s):  class0, class1, class2, class3

Byte 0: Most likely Event Type (enum?) Byte 1: 2nd Most likely Event Type Byte 2: Most likely Event Probability (0 255) Byte 3: 2nd Most likely Event s Probability (0 255) RELIABILITY Deleted: Classification and reliability of classification

LOC_ALG (index)

Attribute(s):  

Brief:  "GRB Location Algorithm"

Instance(s):  lalg

GRB location algorithm used.

LOC_DEC (index)

Attribute(s):  

Brief:  "GRB Declination"

Instance(s):  dec

GRB calculated declination in arcmin

LOC_RA (index)

Attribute(s):  

Brief:  "GRB Right Ascension"

Instance(s):  ra

GRB calculated right ascension location in arcmin

LR_SEQ (index)

Attribute(s):  

Brief:  "GRB LAT Record Sequence Number"

Instance(s):  seq

Record number (1 relative) with respect to the specified TRIGGER ID burst.

LR_VER (index)

Attribute(s):  

Brief:  "GRB Record Type Version"

Instance(s):  ver

Record Type Version Number

TOT_ERR (index)

Attribute(s):  

Brief:  "GRB Total Error"

Instance(s):  err

GRB error on location in arcmin

TRG_ALG_16 (index)

Attribute(s):  

Brief:  "GRB Trigger Algorithm 16 Bit Member"

Instance(s):  talg0, talg5, talg6

Bytes 0-1: uint16 Timescale; Units: msec Byte 2: uint8 Algorithm Number (0 119) Byte 3: uint8 ITIME_ChanLow (0 7) Byte 4: uint8 ITIME_ChanHigh (0 7) Byte 5: uint8 SpareA Bytes 6-7: uint16 ADC_ChanLow (0 4095) Bytes 8-9: uint16 ADC_ChanHigh (0 4095) Bytes 10-15: uint8[6] SparesB Deleted

TRG_ALG_8 (index)

Attribute(s):  

Brief:  "GRB Trigger Algorithm 8 Bit Member"

Instance(s):  talg1, talg2, talg3, talg4, talg7

Bytes 0-1: uint16 Timescale; Units: msec Byte 2: uint8 Algorithm Number (0 119) Byte 3: uint8 ITIME_ChanLow (0 7) Byte 4: uint8 ITIME_ChanHigh (0 7) Byte 5: uint8 SpareA Bytes 6-7: uint16 ADC_ChanLow (0 4095) Bytes 8-9: uint16 ADC_ChanHigh (0 4095) Bytes 10-15: uint8[6] SparesB Deleted

TRGID_TSEC (index)

Attribute(s):  

Brief:  "GRB Trigger ID"

Instance(s):  tsec

Tenths of a second

TRGID_USEC (index)

Attribute(s):  

Brief:  "GBM Trigger ID"

Instance(s):  usec

Microseconds.