HornetBall wrote:

<< > I'm really not trying to practice "technical one-ups-manship" but the
technique called RTK (Real Time Kinematic)differential is used on the
helicopter that I mentioned to greatly reduce the errors.  One receiver
antena is mounted on the nose, and the other on the tail.  Two seperate GPS
units are used, each reporting to a NAV computer. >>

I have heard of this technique also.  The trick is to fix the two antennas at
a distance that is related to the wavelength of the GPS signal.  The
technique looks at signal characteristics in addition to pseudorange from
timing measurements.  It apparently gives tremendous accuraccy, and does not
rely on a DGPS transmitter at all.  Wish I know more about it.

 
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