Raw Data Commands 201
Raw Data Commands
Enter the following command to enable the missile application condensed
measurement record through port A every 5 seconds:
$PASHS,RAW,MCM,A,ON,5
$PASHQ,MCM,c1
This command allows you to query for raw satellite and position measurement data
in the Missile Application Condensed Measurement (MACM) format.
c1 is the optional port designator (port A, B, or C) for the response. If a port is not
specified, the receiver sends the response to the current port.
If the command is set without a period, the G12 uses the period set by the
$PASHS,RCI command If the $PASHS,RCI command is issued after this message
period has been set, the period resets to the RCI setting.
MACM Message Structure
This message is not output unless positions are being computed. MCM is a
combined message containing elements from the MBN, MCA, and PBN messages.
The MCM message was designed for high speed data output under the limited
bandwidth conditions common to high dynamic telemetry. Satellite PRN number,
receive time (the time at which the data was received), doppler measurements,
pseudo-range measurements, and full carrier phase measurements are contained
in this message. The MCM message is variable in length, defined by the count field
in the header. The message begins with a 4-byte sync word [4D 41 43 4D] (ASCII
“MACM”) and ends with a checksum byte. The <CR><LF> characters that terminate
the majority of DG16 response messages are not used in this case. In addition, the
usual response header, $PASHR, is not used here. If the receiver is set to output
the MCM message at regular intervals, the MACM sync word appears only the first
time the message is output and is excluded from the messages that follow; however,
the sync word is output each time MCM is queried. The following is the output for
one epoch. The syntax for each parameter is listed in brackets ads [parameter
name:number of bytes for parameter]. At the right of each line is an identifier and
byte count.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[MACM:4] [COUNT:2] [RCVTIME:4] [NAVT: 4] Header: 14
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1] PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[PRN:1][WRN:1][POL:1][CN0:1][PHASE:8][RANGE:4][DPL:4][LCK_TIME:4] Prn Data: 24
[CHECKSUM:1] Checksum: 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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