Glide Path

A really good, overlooked book.
This book is significant as being the only non-science fiction fiction book that Arthur C. Clarke ever wrote. It was inspired by and (partially, I'm sure) based upon his experience in World War II as a member of the Royal Air Force, using the GCD (Ground Controlled Descent) system to "talk-down" pilots. This is the setting of the story. Though the technology described is not impressive by today's standards (almost 40 years after the book was written, and 60 after the events it fictionalizes), the radar system is gone into in a quite detailed way, and it's obvious that Clarke knows what he's talking about.