Flown in/out of Kigali recently and noticed these objects alongside the runway, approximately 4-5 lined up on either side of the runway. Unsure if they're new or if I've only just noticed them over the years.
They appear to be two grey boxes around 1.5m x 1.5m and I've noticed them spin 180 degrees quickly every now and then, one of them appears to have 4 'holes' or tubes on it? The only thing I could imagine them being are some sort of missile defense system, but I know I'm probably way off the mark with this?
Apologies for the pics, it's the best I could find.
screenshot
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Any ideas or suggestions on what they may be?