No commercial aviation radar system even tries to output non-transponder altitude infomation. Many are secondary only and don't even pick up targets without tra

No commercial aviation radar system even tries to output non-transponder altitude infomation. Many are secondary only and don't even pick up targets without transponders. Military primary radar, like the one that picked up MH370, obviously can. But I don't think any of those are designed for really accurate altitude measurements. That job is usually done with targeting radar which (at the expense of not being able to see multiple targets) can lock a single target and get it's exact position.