For people who really want to know basics, not some protocol of modern Combat Informational Control System doing it for you with sensors feeding data straight to it, here is some great stuff on early ASW. USSR also had a huge number of similar films. So, enjoy, it is very basic, without any math--the physics and mathematics remained essentially the same since then, technology changed. But it is a great intro for those who want to have some visual representation of aerial ASW. I know one person here who will have a blast watching it;))) And he is my good friend.