If I set elevation mask to say 25 deg, does it eliminate data from any satellite below the 25 deg that may have taken a route by multipath? For example, a signal from a satellite below 25 deg hits a building and then hits the antenna at 30 deg, will the elevation mask still remove this?
Is this a viable strategy to deal with potential multipath?
The elevation mask is compared with the calculated elevation angle for the satellite.?ÿ The receiver has no way of knowing what angle the signal actually arrived from.
Total, yes to your first question. You can prove the concept by setting your mask to 85 degrees and deliberately reflect signals into your receiver, they still won't be used from satellites that are below the mask. I'm speculating the ephemeris is used to "ignore" the satellites below your mask.
No to your second question. Unless you believe you can identify all of the paths signals might be reflected from, I wouldn't consider raising the elevation mask a viable way to eliminate multipath. But if you suspect a certain signal is problematic for your solution you can certainly disable the offending satellite.