| Static
(post processed)
|
- L1 or L1/L2 receiver
- simultaneous site occupation
|
30 min to 1 hr
|
Sub-cm
1 cm + 1 ppm to 10 ppm
|
complexity varies
Control surveys (high accuracy,
Slow point positioning
|
| Rapid Static
(post processed)
|
- L1/L2 receiver
- sophisticated techniques and extra information to resolve ambiguities
- Single occupation only
- No continuous lock
|
3 to 5 min
|
Sub-cm
|
Control surveys (medium to high accuracy)
generally for baselines under 10 km, need "extra" measurements
|
| Semi-Kinematic
(Stop & Go)
(post processed)
|
- L1 receiver,
- Needs initialization
- 1-2 min baseline obsn. rover stopped temporarily on points to be positioned with respect to monitor
- Must maintain continuous lock while moving between points
|
~1 min. per point
|
cm+
|
Limited to baselines under ~10 km,
Control surveys (medium accuracy)
Fast point positioning
|
| Pseudo-Kinematic
(post processed)
Reoccupation
|
- L1 receiver
- Each rover site occupied twice, at least one hour apart, to exploit change in satellite geometry
- 5-10 min static obsn
- Double site occupation essential, logistically cumbersome
- No initialization needed
- Loss of lock permitted
|
1-3 min.
|
cm+
|
Control surveys (medium accuracy)
|
| Real Time Kinematic
RTK
|
- L1/L2 receiver
- Data link needed
- For baseline < 10 km
- Moving rover positioned with respect to static monitor,
- OTF initialization or conventional static initial ambiguity resolution
|
- |
cm+
|
Logistically difficult since must maintain lock while moving
Location survey
Photo control
Real time topographic surveys
Construction stake out (medium to high accuracy)
|
