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RoyalTek GPS Receiver REB-2000/REB-12R REV-2000 Operational Manual
32
data and carrier data for each measurement
epoch.
1. Computation of initial Receiver
Time(RT) in seconds. Note-Where the
initial arbitrary value chosen at start
up to make the PR reasonable
(i.e.,set equal to TT+70ms) and then
incriminated by one second for each
measurement epoch.
2. Computation of Transmit Time (TT) in
seconds.
3. Calculate Pseudo-range at a common
receiver time of the first channel of
the measurement data set. Note-All
channel measurements are NOT
taken at the same time. Therefore, all
ranges must be extrapolated to a
common measurement epoch. For
simplicity, the first channel of each
measurement set is used as the
reference to which all other
measurements are extrapolated.
4. Extrapolate the pseudo-range based
on the correlation interval to improve
precision.
5. Compute the delta range.
If the accumulation time of the Dalta Carrier
Phase is 1000 ms then the measurement is
valid and can be added to the previous Delta
Carrier Phase to get Accumulated Carrier
Phase data. If the accumulation time of the
Delta Carrier Phase is not equal to 1000 ms
then the measurement is not valid and the
accumulation time must be restarted to get
Accumulated Carrier Phase data.
Response :Software Version
String – Message I.D.6
Output Rate:Response to polling message
Example:
A0A20015 – Start Sequence and Payload
Length
0606312E322E30444B495431313920534
D0000000000-Payload
0382B0B3 – Message Checksum and End
Sequence
Table 47 Software Tracker Data Out
Binary(Hex) ASCII(Decimal)
Name
Bytes
Scale Example
Units
Scale Example
Message ID 1 06 6
Character 20 1 2
Payload Length: 21 bytes
Note – Convert to symbol to assemble message (i.e., 0x4E is ’N’). These are low priority task and
are not necessarily output at constant intervals.
Response :Clock Status Data – Message I.D.7
Output Rate:1Hz or response to polling message
Example:
A0A20014 – Start Sequence and Payload Length
0703BD021549240822317923DAEF – Payload