ashtech ZY-12 Information Supplement page 99

<packed data> Parameter:
Table 4.12. $PASHR,RPC Packed Parameter Descriptions
Data
Symbol Range
Type
double rcvtime 0 - 604800000 1 msec
char[4] site ID
long PRN
The following data repeats for each satellite whose corresponding bit in PRN is "1":
double PL1
char WN
Sign
long PH_I
double PH_F
Zeros are padded so that all of <Packed Data> part is a module of 16 bits.
Total number of bits in <Packed Data>: ceil ((94 + 72*2*Nsvs)/16) * 16
Serial Port Output
Compressed
Resolution
# Bits
30
32
32
1.0E-10 31
seconds
1
1 1
1 28
15.0E-4 11
Description
Receiver time in GPS milliseconds of
week
Receiver's four character's site ID
PRN for the satellites which have data
in this message. It is a bitwise indica-
tion. Starting from least significant bit,
bit 1 corresponds to Satellite PRN #1,
bit 2 corresponds to Satellite PRN #2,
and so on. Bit value of 1 means that
Satellite PRN has data in this mes-
sage, 0 otherwise.
Pseudorange in units of 1.0e-10 sec-
onds (or 0.1 nanoseconds). Multiply
this value by 1.0e-10 to get
pseudo-range in seconds. A zero
value indicates bad pseudo-range
Warning bit
1- bad carrier phase and has possible
cycle-slips
0 - good carrier phase
Carrier phase sign bit
1 - negative carrier phase value
0 - positive carrier phase value
Integer part of the carrier phase mea-
surement in cycles
Fractional part of the carrier phase
measurement in units of 5E-4 cycles.
Multiply this number by 5E-4 to get
fractional carrier phase in cycles.
Whole carrier phase measurement =
PH_I + PH_F*5.0E-4
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