"Harry Andreas" wrote in message
...
In article , "Tarver Engineering"
wrote:

"Harry Andreas" wrote in message
...

Keep that basket small. If your system has enough bandwidth you can
update
the weapon all the way to the target and at the terminal point it's
within
the
CEP of the blast effect for the particular weapon you've selected.
Obviously the 2000lb JDAM requires less bandwidth for a given target.
Also obviously the performance of your SAR, GPS receiver, and datalink
are
crucial.

So far the GPS/Data link combination has performed at less than expected
levels. I havn't seen anything good about the Navy plan to replace
TACAN
with GPS/Data link and FAA just killed the LAAS landing system.

The JSF GPS receiver is significantly better than anything else on the
market.
We'll be delivering the first EMD in September.

Google JPALS.

http://www.ainonline.com/issues/06_0...electsp94.html

As you can see by reading the URL, other differential GPS systems have happy
press releases, while often producing less than adaquate results.

For military style systems, the binary satellite provides 0.2 meter accuracy
without augmentation in the longitudinal reference frame. Altitude may
altentaively be resolved using the TWAS data base and thereby eliminates the
error WGS-84 error documented in RTCA DO-208 change 3. UPSAT has
demonstrated same with the CNX-80 using civil codes, optional improvement
for WAAS augmentation shows only a small advantage. (VNAV)