Spectra Precision ProMark 800 Reference Manual - Manual (Page 95)

83
RTK Implementation
RTK Correction Data Formats
This section describes the different data formats that can be
used by Spectra Precision receivers to transport RTK
correction data from a base to a rover.
One of the preliminary settings you will have to do before
using your equipment is to choose one these data formats and
set the output rate. This choice should be done in
conjunction with that of the data link (see the ”Data Link”
section).
Key Terms and
Expressions
Observable: Is another name for the data being collected
(observed) by a receiver.
Proprietary
Formats
ATOM
ATOM is an Ashtech proprietary format. Being much more
compact and modern (i.e. supporting new GNSS
constellations and signals) than DBEN, it has replaced it
gradually in all the latest Spectra Precision products.
The table below lists the most commonly used ATOM
scenarios to generate RTK corrections (not an exhaustive list;
For more details, see ATOM Reference Manual or RTC,TYP:
RTCM Message Type on page 237):
DBEN
DBEN is an older Ashtech proprietary format (not
recommended for use anymore). It is a compressed format
that includes pseudo-range and carrier phase measurements.
The DBEN format consists of two different messages as
described in the table below.
Message Type
Transfer Rate
(default)
Range
Standard observations 1 second 0.05 to 1800 seconds
Compact observations 0 0.05 to 1800 seconds
Super-compact observations 0 0.05 to 1800 seconds
Reference position and antenna
height
-
Non user-settable,
depends on scenario
chosen.
Receiver and antenna attributes 31 seconds 0.05 to 1800 seconds
Message Type
Transfer Rate
(default)
Range
Code and phase measurements 1 second
Less than 1 second
up to 300 seconds
Base position 30 seconds 1 to 300 seconds