Right. Those are usually referred to as anti-radiation missiles.
"Harpoon has a radar transceiver, while HARM has a receiver."
The Harpoon certainly seems outmoded compared to the Russian Sunburn type missiles:
It reaches a speed of Mach 3 at high altitude and Mach 2.2 at low-altitude. This speed is triple the speed of the subsonic American Harpoon. When slower missiles, like the Harpoon or the French Exocet are used, the maximum theoretical response time for the defending ship is 120 to 150 seconds. This long response time provides time to launch countermeasures and employ jamming before deploying "hard" defense systems such as missiles and close-in weapon systems. But the high speed of the 3M82 "Mosquito" missiles reduce the maximum theoretical response time for the defending ship to 25 to 30 seconds. This short response time makes jamming and countermeasures very difficult, and firing missiles and quick-firing artillery even more difficult.The other kicker is the Sunburn can carry both nuclear and conventional warheads, while the Harpoon is conventional only. It also already has greater range than the upgraded Harpoon will.
The Sunburn and the Yakhont are terrifying. Using mobile launchers, they could do devastating damage in confined spaces like the Persian Gulf.
Our procurement system and political system are so broken we’re going to lose our tech edge, which is about all that is keeping us head-and-shoulders above the rest.