In message , Kevin Brooks
writes
"Harry Andreas" wrote in message
...
SAR updates to pre-programmed INS settings have been used since the
early 90's to improve the accuracy of GPS aided munitions.

Uhmmm...Harry, what GPS guided munitions were in service during the "early
90's"?

"In service" or "in development and undergoing testing"?

You don't need the SAR update to launch a JDAM, but it dramatically
improves the CEP of the weapon and essentially means that you can use
a smaller weapon to take out a target.

Well, it improves it, but not sure how "dramatically";

Depends how good your maps are. GPS/INS guidance will hit a designated
point, but how well does that relate to the actual location of the
target? SAR radar helps a lot if you know that the target is "fourth
warehouse from the road" but your mapping isn't precisely sure about
exactly where in WGS84 co-ordinates that warehouse, or the road, is (but
you know fairly closely where, and the warehouses and the road both show
on SAR)

--
When you have to kill a man, it costs nothing to be polite.
W S Churchill

Paul J. Adam MainBoxatjrwlynch[dot]demon{dot}co(.)uk