"SC Attitude Broadcast Message" (APP/LSM)

ITOS Mnemonic:  LSMSIATTITUDE

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Focus:	Maintenance / Operation
Structures:	Abstract / Concrete

Context:

Description:

The SC sends this message 5 times a second on the CTDB bus. It contains information about the SC-J2000 attitude.

Layout:  (hide detail; help)

SC Attitude Broadcast Message (SIATTITUDE) 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=0x701:1
002	SF=3		Sequence Count
004	Packet Length=55
006	0	Function Code=1
008	TIMESEC sec
00C	TIMESUB sub
010	ATTQUAT quat[0-3]
030	ATTAVEC avel[0-2]
03C	Packet Checksum

SIATTITUDE (pkt)
|  TIMESEC sec (fld)
|  TIMESUB sub (fld)
|  ATTQUAT quat[0-3] (fld)
|  ATTAVEC avel[0-2] (fld)

typedef struct _LSM_SIATTITUDE_Pkt {

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

    /* Command payload */
    LSM_SIATTITUDE_Prm   pay;

} LSM_SIATTITUDE_Pkt;

Fields:

ATTAVEC (index)

Attribute(s):  

Brief:  "Attitude angular velocity element"

Instance(s):  avel

ATTQUAT (index)

Attribute(s):  

Brief:  "Attitude quaternion element"

Instance(s):  quat

TIMESEC (index)

Attribute(s):  

Brief:  "Timestamp seconds"

Instance(s):  sec

TIMESUB (index)

Attribute(s):  

Brief:  "Timestamp microseconds"

Instance(s):  sub