1. CDF - Code Float Solution. Users with SBAS tracking turned on (Setup>Advanced>GNSS>SBAS) in areas covered by SBAS, such as FAA WAAS in the US will notice a new status in the fix status icon which has typically shown FIX FLT or STN will see CDF. This indicates a Code Float Solution. In a 12 hour test on a known point I observed 700 points, one per minute with each point being an average of 10 epochs.
The average position of the 700 points that were stored:
6835852.76
3100685.34
400.00
NAD83, State Plane, Texas North Central, NAVD88, US Survey Feet
The NAD83(2011) coordinates for POST:
6835851.451
3100685.820
402.960
NAD83(2011), State Plane, Texas North Central, NAVD88, US Survey Feet
Difference:
N +1.31'
E -0.48'
U-2.96'
Accuracy (from known position of POST):
100% H 6.54ft V 11.4ft
99% H 4.07ft V 10.6ft
95% H 3.22ft V 7.38ft
68% H 2.02ft V 4.75ft
Accuracy (from Average of 700 points):
100% H 5.27ft V 9.61ft
99% H 3.18ft V 8.4ft
95% H 2.56ft V 6.81ft
68% H 1.41ft V 2.94ft
It appears from this 12 hour test that the LS is capable of generating submeter positions using WAAS, at the 95% confidence level. This is useful for all sorts of mapping that doesn't require high precision.
WAAS delivers WGS84 positions which introduce a meter bias (horizontally) from NAD83 in the US. Because the LS is a highly capable geodetic receiver, the bias is addressed automatically. Many manufacturers consider SBAS to be so rough that addressing the transformation between WGS84 and NAD83 are generally ignored. The LS addresses the transformation because I have the coordinate system set to NAD83.
The average position of the 700 points that were stored:
6835852.76
3100685.34
400.00
NAD83, State Plane, Texas North Central, NAVD88, US Survey Feet
The NAD83(2011) coordinates for POST:
6835851.451
3100685.820
402.960
NAD83(2011), State Plane, Texas North Central, NAVD88, US Survey Feet
Difference:
N +1.31'
E -0.48'
U-2.96'
Accuracy (from known position of POST):
100% H 6.54ft V 11.4ft
99% H 4.07ft V 10.6ft
95% H 3.22ft V 7.38ft
68% H 2.02ft V 4.75ft
Accuracy (from Average of 700 points):
100% H 5.27ft V 9.61ft
99% H 3.18ft V 8.4ft
95% H 2.56ft V 6.81ft
68% H 1.41ft V 2.94ft
It appears from this 12 hour test that the LS is capable of generating submeter positions using WAAS, at the 95% confidence level. This is useful for all sorts of mapping that doesn't require high precision.
WAAS delivers WGS84 positions which introduce a meter bias (horizontally) from NAD83 in the US. Because the LS is a highly capable geodetic receiver, the bias is addressed automatically. Many manufacturers consider SBAS to be so rough that addressing the transformation between WGS84 and NAD83 are generally ignored. The LS addresses the transformation because I have the coordinate system set to NAD83.
