One of the characteristics of good GPS processing software is its ability to assist the user in diagnosing and sometimes repairing failed or marginal baselines. In this regard, the double-differenced residuals plot is particularly useful, as it helps to identify signals that might advantageously be removed from the solution. However, as has been pointed out previously, removing a satellite is not always a good idea, as doing so may change the solution's geometry to the point of degrading the result. As currently designed, Solutions 2.5 makes the decision-making process a trial-and-error affair.

Thus my wishlist item: Why not add an option to the vector right-click menu that brings up two sky plots, one at each end of the vector? This would present the user with a graphical representation of the way the SVs are arranged throughout the session and a visual means of evaluating the potential effect upon the solution of removing an SV. I assume that the algorithms for producing the plots can be transplanted from the mission planning tool, so it seems as though this would be a minor rewrite of the code.

Thoughts, anyone?

Modified By Jim Frame on 11/15/2001 at 9:48 AM

You may already have a way of determining this degradation of geometry. On the far right side of the vectors page (I think) is the PDOP for the solved vector. I would think this would be a fair indicator.

Shawn

The PDOP value tells you the current status of the vector, but doesn't provide any indication of the value that would result from removal of an SV from the solution. Would not having the skyplots enable one to predict the impact of SV removal without having to reprocess on a trial-and-error basis?

Jim, the Mission Planning function will do that; you can turn individual SV's on or off.

It can, to be sure; my point is that it would be very convenient to have simultaneous skyplots for both ends of a vector available on a right-click.

What if you had the PDOP plot in a seperate window based on the current time (picked by mouse on the residual plot) with the tools also open to turn sv's on and off in the pdop plot which would then update with available sv's on......if that makes any sense !!!

Also I'd still like to see more than one sat at a time but less than all at once.....i.e., sv's not being mutually exclusive when selected !!

Jimbo

James Webb wrote:

What if you had the PDOP plot in a seperate window based on the current time...

This would be handy, though I'd still like to see the sky plot at each end for an overview of the geometry affecting of a vector. Let's make it an AND rather than an OR.

See above thread "Missing a click...."

Let us modify paths to the SV data files !!!!Please !!!!

Jimbo