Spectra Precision ProMark 800 Reference Manual User Manual

Page 65

Precise Surveying - Field Applications & Concepts

In post-processed surveying, the rover asks you to stay still on
the known point for a preset occupation time. This particular
event in the logged raw data file will help the post-processing
software initialize more quickly.

The known point can be a point previously surveyed in post-
processing static mode.

Initializer Bar

The Initializer Bar method can be used more especially when
the survey takes place in the vicinity of the base (short
baseline). It makes use of an initializer bar, also called
“kinematic bar”, mounted at the base. The bar is attached to
the antenna base and, for a limited time, the rover antenna
as well.

The bar in fact defines a 20-centimeter, known baseline
length. After a preset occupation time, the rover antenna is
moved to the rover pole, taking care not to obstruct the
antenna during this action.

Initialization in

RTK Surveying

Field Approach

In real-time surveys, the position status will at all times
inform you of the real status of initialization. At power up, the
time required to get a fixed solution, i.e. the time for the rover
to get initialized is called TTFF (Time To First Fix).

Obviously, for a given baseline length, the better the
operating conditions (low DOP, large number of received
satellites, open sky conditions), the easier the initialization,
and therefore the shorter the TTFF.

Base

Rover

Baseline

Reference Point

1. 2.

Base

Reference Point