Vector Sensor Reference Manual 84
6.6.9 ZDA Data Message
The ZDA message contains Universal Time information. Table 6-14 breaks down the ZDA data
message into its components. This message has the following format.
$GPZDA,hhmmss.ss,dd,mm,yyyy,xx,yy*cc<CR><LF>
Table 6-14 ZDA Data Message Defined
Field Description
hhmmss.ss UTC time in hours, minutes, seconds of the GPS position
dd Day, dd = 0 to 31
mm Month, mm = 1 to 12
yyyy Year
xx Local zone description in hours, xx = -13 to 13
yy Local zone description in minutes, yy = 0 to 59
*cc Checksum
<CR><LF> Carriage return and line feed
6.6.10 RD1 Data Message
The RD1 message contains diagnostic information for SBAS operation. Table 6-15 breaks down
the RD1 data message into its components. This message has the following format.
$RD1,SecOfWeek,WeekNum,FreqMHz,DSPLocked,BER-
BER2,AGC,DDS,Doppler,DSPStat,ARMStat,DiffStatus,NavCondition *cc<CR><LF>
Table 6-15 RD1 Data Message Defined
Field Description
SecOfWeek The second of GPS week (may be a couple of seconds old)
WeekNum The GPS week number
FreqMHz The L-band frequency in MHz (1475.4200 is used for SBAS)
DSPLocked 1 if DSPStat = 1B or 1F
BER-BER2 Bit error rate - bit error rates are given for both SBAS satellites being tracked
AGC L-band Signal strength
DDS 0.0 for SBAS
Doppler 0 for SBAS
DSPStat A status bit mask for the DSP tracking of SBAS
ARMStat A status bit mask for the ARM GPS solution
DiffStatus The SBAS PRN of the satellite in use
NavCondition A series of hex character fields, which is read from right to left, with each field
representing the number of GPS satellites satisfying a certain condition, all of which
conditions are required if the satellite is to be used in the solution
*cc Checksum
<CR><LF> Carriage return and line feed
The following table describes the DSP status. The DSP status should be 17, 1B, or 1F when SBAS
tracking has been achieved.
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