
58
Promark2 User’s Guide
Kinematic Surveying with the ProMark2 System
The kinematic data collection process requires at least two receivers collecting data
simultaneously. One receiver is called the base and must remain stationary throughout the data
collection. Typically, the base receiver will occupy a survey point for which the precise
position is already known. Once operational, the base system simply collects and stores raw
data from all satellites with line of sight to the GPS antenna. The kinematic base is essentially
the same as a static occupation except that the recording interval should be set to match that of
the kinematic rover. The other simultaneously operating GPS receiver during a kinematic
survey is designated as the rover. The rover unit(s) can move during the survey and are used to
position new points relative to the base. There are two types of kinematic survey supported by
the ProMark2 system: stop-and-go (designated as “stop-n-go” in the receiver menus) and
continuous kinematic (designated as “kinematic” in the receiver menus). Stop-and-go
surveying is best suited for collection of points. During Stop-and-go, the system is centered
over a point and collects data for a period of time. The occupation time for stop-and-go will
typically range from 15-60 seconds. It is highly recommended that a pole with bipod legs be
used for Stop-and-go data collection to insure that the antenna is stable during this data
collection period. Once the point occupation is finished the system can be carried to the next
survey point and the data collection procedure is repeated. Continuous kinematic data
collection is suited for collecting bulk points with minimal attributing (terrain modelling) or
linear features such as a road centerline. During continuous kinematic data collection the user
never has to stop moving. A point is collected every time the receiver records a data record.
The recording interval for this application would typically be 1-5 seconds, and the accuracy is
typically 0.03 to 0.05 meters.
The rover system is designed to be carried easily and is mounted entirely to a range pole. The
system software interface is provided by the on-board data collector of the ProMark2 unit.
Essential system functionality such as data recording and data attributing are operated with the
LED display and control buttons.
Kinematic data collection has the advantage of high productivity. However there are some
trade-offs to be considered. Accuracy is not as good as with GPS static data collection
methods (see data sheet for specifications). In addition, field procedures require more
planning and care. Before beginning the kinematic survey, the rover unit must go though an
initialization stage. Initialization lasts from 15 seconds to 5 minutes depending on conditions.
Procedures for initialization will be described in detail later in this manual. During the
kinematic data collection, the receiver must maintain lock on at least 5 satellites which are
common at both the base and rover stations. If the receiver detects that less than 5 satellites are
tracked, it will send out an alarm indicating that the system must be reinitialized. In cases of
loss of lock due to obstructions, it is possible that the accuracy of processed results will be
degraded if re-initialization is not performed in the field. Therefore, re-initialization in the field
Содержание CGRS
Страница 1: ...ProMark2 TM System User Guide www thalesnavigation com THALES NAVIGATION ...
Страница 14: ...xiv ProMark2 User s Guide ...
Страница 36: ...22 Promark2 User s Guide ...
Страница 156: ...142 ProMark2 User s Guide ...
Страница 159: ......