ashtech G12 - NMEA Commands

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125

Commands

to or greater than the elevation mask ($PASHS,ELM), and only if the number of locked satellites is

equal to or greater than minimum satellite mask ($PASHS,MSV).

Table 4.61 defines the format of the MBN warning flag.

MCA: Raw Measurements (Ashtech Type 3 Data Structure)

$PASHS,RAW,MCA,[c1],s2,[f1]

This command enables or disables the measurement data (MCAA) messages with

Ashtech Type 3 data structure, where c1 is port A, B or C (optional port), s2 is ON

or OFF, and f1 is the optional numeric output interval setting supporting a range of

0.05 to 999 seconds, depending on the measurement update rate option installed.

This message is output in binary format on every recording interval (RCI) for locked satellites

with an elevation equal to or greater than the elevation mask (ELM), and only if the number of

locked satellites is equal to or greater than the minimum satellite mask (MSV).

$PASHQ,MCA,[c1]

This command queries for raw satellite measurement data contained in the Ashtech

Type 3 data structure; c1 is the optional port designator for the response. If a port

is not specified, the receiver sends the response to the current port.

Table 4.61. MBN Warning Flag Format

Bits Index Description

1 2 Combination of bit 1 and bit 2:

00 Code and/or carrier phase have been measured for the satellite referenced in [svprn]

01 Code and/or carrier phase have been measured, and the navigation message was

obtained for the satellite referenced in [svprn], but these data were not used to compute

position

10 Code and/or carrier phase have been measured, the navigation message was obtained,

and these data were used in the position computation

3 Symbols in the navigation message have not been synchronized

4 Pseudorange measurement is not smoothed

6 Cycle slip indicator

8 A loss of continuity has occurred. This error flag is present when the receiver has

reacquired lock on the code and/or carrier phase of the satellite signal. It also occurs after

the polarity becomes known.

G12RevD.book Page 125 Tuesday, April 2, 2002 4:33 PM