Yes, it happens. We have that problem here in Billings. It is for that
reason that our RY28R ILS has no procedure turn. It's also why I have
two marks on my radar scope, one north and one south. The aircraft must
be at or inside these marks beore I can turn an aircraft on the
localizer and issue the clearance. If I do it too soon the aircraft may
grab the wrong localizer.



wrote:
I recall reading about false lobes on the glideslope, and have seen it
firsthand doing practice approaches in VMC. I thought it was due to antenna
sidelobes, and thus the localizer might be subject to a similar phenomenon. I have
yet to see anyone reference this, so is there a technical reason why they don't exist?
One of the localizer transmitter frequencies have a different antenna pattern to
interleave the sidelobes perhaps?

-Cory