It wouldn't be hard to build a cheap automated station consisting of some sensors and a mass driver turret. It sits there without engines or life support to make her energy signature low and hard to spot. When a ship comes into view which isn't broadcasting the right IFF codes, it gets lit up.
Cheap, effective. You could put them in a huge lattice, one AU apart, near the hyperlanes and then leave them for decades.
That's a minefield.
Cheap, effective. You could put them in a huge lattice, one AU apart, near the hyperlanes and then leave them for decades.
That's a minefield.
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