NavCom LAND-PAK Rev.N - Manual (Page 50)

Technical Reference Manual Rev. N
Blk = All; Blu = IOP w/Internal Radio ; Red = IOP & LBM ; Grn = Engine only 48
0x42 - RTG QuickStart Control
This message allows the StarFire RTG navigation solution to be initialized to a known position
and therefore eliminate lengthy pull-in times. This message is used for both commands to the
Starlight and responses from the Starlight.
Record
Usage Command - Yes
Response - Yes Input: Sets initial StarFire™ position. See notes. Bias errors in the input
position are directly translated to the 0xb1 message; Output: reports status
Ref Message Field Description
Data
Type
Units Range Scale
Byte
Count
STX 02 (hex) U08 1
PRA1 99 (hex) U08 1
PRA2 66 (hex) U08 1
ID 42 (hex) U08 1
Length 0x0019 U16 2
W1
Command Action
B1=0: Do not store in NVRAM
1: Store in NVRAM
B2=0: Do not use ACK/NAK
1: Use ACK/NAK
B3=0: Use Commanded Values
1: Use Default values
U08 1
W2
Mode (see notes below)
0x00: IDLE
0x01: RESET
0x02: INITIATE/INITIATED
0x03: IN PROGRESS
0x04: COMPLETE
0x05: FAILED PROXIMITY
U08 1
W3 Latitude S32 arc sec LSB: 2.0 -11 4
W4 Longitude S32 arc sec LSB: 2.0
-11
4
W5 Height S32 meters LSB: 2.0
-10
4
W6
Extended Latitude (B7…B4) U04 arc sec LSB: 2.0
-15
1
Extended Longitude (B3…B0) U04 arc sec LSB: 2.0
-15
W7 Latitude Uncertainty U16 sq. meters LSB: 2.0
-11
2
W8 Longitude Uncertainty U16 sq. meters LSB: 2.0
-11
2
W9 Height Uncertainty U16 sq. meters LSB: 2.0
-11
2
CKSM Checksum U08 1
ETX 03 (hex) U08 1
On input, the Mode field contains one of the following values:
QuickStart can not be initiated until the receiver is in a “RTG Dual” state, typically 3
minutes after startup.
0x00 - IDLE - Cancels an initiated or in progress QuickStart without resetting RTG
navigation. Also can be used to return the reported QuickStart mode to ‘Idle’ from either
‘Completed’ or ‘Proximity Failure’ as described in 1b) above.
0x01 - RESET - Cancels an initiated or in progress QuickStart and causes a full reset of
RTG navigation.