WAAS myths

[Kerry.]

Gliderguy, I think what sort of slowed WAAS down a little was the setting to zero of SA and the $$$'s that were steadily and steadily building.

 

At this point in time most countries simply couldn't afford or justify a WADGPS (WAAS) type system but still not a wheels on the ground type landing system in any weather as that where LAAS sort of fits in.

 

The reporting of those errors considering the time frame they need to be reported in is a critical component with WAAS (still to be solved in some instances). I suppose WAAS is WAAS but as it's implemented in most handheld type receivers is rather a little different to the full capability of the system as far as error reporting and capability is concerned.

 

For recreational type handhelds it's rather not an ideal type of system to even be bothering with at this point in time but some have seen the need to promote it as "the thing" (sometimes the only thing), which really it's not but as you say for aircraft that's a totally different story but for some reason developement has appeared to have slowed remarkedly in recent times?

 

Cheers, Kerry.

 

I never get lost everybody keeps telling me where to go

[+ZingerHead]

I ran across a very interesting and lightly technical explanation of GPS that included some discussion of WAAS and what it may mean in the future. Plus it helped me understand a lot more about how these GPSr units pull off their magic. Look for the "How GPS works" section at www.trimble.com.

[+BMeinhart]

"The primary factor is spatial decorrelation, which is the degradation of corrections due to separation from the reference station." Quote from EraSeek

 

Now if I were to say that one sentance to my mother, She would warsh (Florida term) my mouth out with soap just because she didnt get it!

[+BMeinhart]

"The primary factor is spatial decorrelation, which is the degradation of corrections due to separation from the reference station." Quote from EraSeek

 

Now if I were to say that one sentance to my mother, She would warsh (Florida term) my mouth out with soap just because she didnt get it!

[+EraSeek]

quote:

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Originally posted by Bernie & Sheri:

_"The primary factor is spatial decorrelation, which is the degradation of corrections due to separation from the reference station."_ Quote from EraSeek

 

Now if I were to say that one sentance to my mother, She would warsh (Florida term) my mouth out with soap just because she didnt get it!

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Wait a minute... I said that? I ain't smart enough to have said all that!

 

[+EraSeek]

quote:

---

Originally posted by Bernie & Sheri:

_"The primary factor is spatial decorrelation, which is the degradation of corrections due to separation from the reference station."_ Quote from EraSeek

 

Now if I were to say that one sentance to my mother, She would warsh (Florida term) my mouth out with soap just because she didnt get it!

---

---------------------------------

 

Wait a minute... I said that? I ain't smart enough to have said all that!

 

[+EraSeek]

Ok I see it now, I was quoting the experts on why DGPS suffers from seperation from stations but WAAS does not. I knew that was too much of a mouthfull for me. Here's the quote:

 

"WAAS system will generally be more accurate than beacon based DGPS because of the way the corrections are rendered by the WAAS system and applied by the GPS receiver. The primary factor is spatial decorrelation, which is the degradation of corrections due to separation from the reference station. RTCM based DGPS corrections suffer from spatial decorrelation, but WAAS corrections do not."