Well raytheon isn't the only provider of psr systems, just in the US. The economics of primary surveillance radars is strange. Reliable service (the war on nin

Well raytheon isn't the only provider of psr systems, just in the US. The economics of primary surveillance radars is strange. Reliable service (the war on nines), robust filtering of false alarm (even tough multi-sensor ATC trackers have made huge strides...) more and more requirements on the 'high speed + maneuvering' kinematics (replace mil psr radars in some missions) and in the 'slow or static small rcs' (drones mostly but also helps). Processing latency is getting squeezed to 'almost impossible with COTS HW' levels and regulatory requirements only increase like mad. But you're only selling & installing what, at most 100 a year? Good luck recouping any R&D. The entry in such a market is hard too, as ATC operators are conservative as hell, and Chesterton's fence tends to be respected a bit religiously by customers.