On 10/08/2010 08:09 PM, Brooke Clarke wrote:
Hi John:
The WAAS birds may be too weak to receive with an omni antenna, hence
the desire to get some gain.
The normal GPS sats will pass through the beam and the GPS antenna will
pick up some sats directly so you do get some TRAIM.
Doppler is not an issue in timing mode (i.e. position is known) and only
one sat is required.
The WAAS/EGNOS/SBAS power should be equal to the GPS birds, such that a
normal GPS receiver can receive them on the same antenna, the code is
such that a standard GPS receiver channel can lock to it, the big
difference lies in the rate and encoding of the data-channel. Calls for
some extra software including a standard Viterbi-decoder.
Cheers,
Magnus
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