"SC Attitude Broadcast Message" (APP/LSM)

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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.

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SC Attitude Broadcast Message (LLSMSIATTITUDE) 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	LLSMTIMESEC sec
00C	LLSMTIMESUB sub
010	LLSMATTQUAT quat[0-3]
030	LLSMATTAVEC avel[0-2]
03C	Packet Checksum

LLSMSIATTITUDE (pkt)
|  LLSMTIMESEC sec (fld)
|  LLSMTIMESUB sub (fld)
|  LLSMATTQUAT quat[0-3] (fld)
|  LLSMATTAVEC avel[0-2] (fld)

typedef struct _LSM_LLSMSIATTITUDE_Pkt {

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

    /* Command payload */
    LSM_LLSMSIATTITUDE_Prm pay;

} LSM_LLSMSIATTITUDE_Pkt;

Fields:

LLSMATTAVEC (index)

Attribute(s):  

Brief:  "Attitude angular velocity element"

Instance(s):  avel

LLSMATTQUAT (index)

Attribute(s):  

Brief:  "Attitude quaternion element"

Instance(s):  quat

LLSMTIMESEC (index)

Attribute(s):  

Brief:  "Timestamp seconds"

Instance(s):  sec

LLSMTIMESUB (index)

Attribute(s):  

Brief:  "Timestamp microseconds"

Instance(s):  sub