Spectra Precision ProMark 800 Reference Manual - Manual (Page 66)

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Precise Surveying - Field Applications & Concepts
The initialization can even be faster if there is a possibility for
you to use the “Known Point” initialization method, or, if your
receiver is a ProMark3, the “Initializer Bar” method.
Typical Initialization Times (TTFF)
The charts below show the variations of the TTFF obtained
with Spectra Precision receivers, as a function of baseline
length, initialization method and receiver type, for normal
operating conditions (open sky, 8 satellites, PDOP<3).
TTFF Charts:
For single-frequency receivers using the initializer bar
(baseline length: 20 cm), the TTFF is less than 60 seconds
when one or more SBAS satellites are in view and their
collection data are available.
Initialization in
Post-Processed
Surveys
Field Approach
In post-processed surveys, determining if the collected data
will result in successful initialization when later post-
processing the raw data is not as easy as in RTK. Below are a
few recommendations to help you perform successful
initializations:
• The observation time is an important factor for successful
initialization. The longer the baseline length, the larger
the required amount of data and so the longer the required
observation time. Such indicators as the “Observation
Timer” or “Observation Range” available on some Spectra
10 km 0 km 20 km
Baseline
length
Initialization time
3 s
300 s
30 s
Kinematic O
TF
Static O
TF
Known P
oint
Know
n Poi
nt
Dual-Frequency
Receivers
Single-Frequency
Receivers
10 km 0 km 20 km
Baseline
length
Initialization time
0.5 min
50 min
5 min
Kinematic O
TF
Static OTF
Known P
oint
Know
n Po
int