I was under the impression that part of the 30% savings in time was a result of the WAAS sat data being used in the Post-processing.

Nothing I saw in the MMCE manual or the PM3 Quick-start gave me that impression.

Now, the electronics evidently result in a more robust receiver.

Is the filtering better and/or is the signal amplified in the receiver?

I'd be interested to hear from the source of this info.

Im trying to imagine how WAAS can be used in post-processing and I can't. It doesn't broadcast the type of data used in the post-processing algorithms that I know of.

Sat

is a differential correction. Why you would use it in a post-process I don't know. In PP you are processing to stations much closer than the WAAS control stations. Kind of like saying I will use RTK in post-processing; it's an either-or sort of thing.

The "prism" technology uses the WAAS to get a quicker fixed location.

Isn't the "prism" technology actually in the post-processing software? After all, from what I understand the GPS data from a PM3 is not the same as data from a PM2. What would be "different" if not WAAS data?
Modified By John Francis on 11/20/2005 at 7:46 PM

you could be right; it might be used to help fix the ambiguities.

The way I understand it the WAAS signal allows the receiver to figure out a rough position faster, then using that position to figure out the ambiguities faster. Once the data is good I did not think you need any further WAAS signals. The only reason to save the WAAS signal I can see is if GNSS Solutions is actually going to refigure the ambiguites in the office again, or maybe they have always been resolved in the office software and I just didn't know what I was talking about.

Paul in PA

Doesn't make sense to me though. It takes about 5 minutes after tracking for the receiver to be able to utilitize the WAAS model. SPS (autonomous) isn't that much worse than WAAS (position-wise) and can get you a position much faster.

Also, post-processing software doesn't use the position solution you see on the screen to do it's work. It computes its own.

Maybe it uses the stability of the WAAS position as one indicator of satellite signal stability to determine how much remaining occupation time is recommended...not sure. It'd be interesting to hear from Thales tech support or product manager on this.

Sat