[teqc] File0000.MP1 & file0000.MP2

Azizul Azwan azizulazwan at gmail.com
Thu Mar 6 05:56:27 MST 2008


Dear lou,

Can you explain about multipath slip..

On Wed, Mar 5, 2008 at 10:32 PM, Lou Estey <lou at unavco.org> wrote:

> Azizul Azwan wrote:
> > Why the value of MP1 & MP2 is quite difference, whereby MP1 is smaller
> > than MP2. For example :-
> >
> > Moving average MP1      : 0.083715 m
> > Moving average MP2      : 0.725831 m
>
> The mp1 rms should always be smaller than the mp2 rms, but usually mp1
> rms is ~50-80% of the mp2 rms.  What you show above is very atypical.
> Possible causes:
>
> * mp1 = mp1(P1, L1, L2) and mp2 = mp2(P2, L1, L2): if P1 was "smoothed"
> and P2 in a raw measurement, then the mp1 rms would be substantially
> smaller than the mp2 rms (based on our experience with smoothed
> pseudorange
> measurements)
>
> * teqc might have detected _many_ more mp1 slips than mp2 slips; if so,
> this would artificially lower teqc's mp1 rms estimate
>
> Taken out of context, it's a little hard to comment further.
>
> --lou
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