Aim-7MH Sparrows and AAMRAAMs have a home on Jamming feature which works because jamming is directional and continuous. Unfortunately with moving targets, home

Aim-7MH Sparrows and AAMRAAMs have a home on Jamming feature which works because jamming is directional and continuous. Unfortunately with moving targets, home on radar is difficult. You only see the radar when it is pointed at you and a scanning radar you will only see blips. Also you can't get range and bearing so lead targeting is difficult. An anti-radiation missile may be able to home on a target that is using a Single Target Track mode. However it would have to ride the beam in and would still have trouble with terminal guidance if the target is cranking left or right. Also in that case, the enemy already knows where you are. The best passive tracking system I know of is the R-27ET which uses thermal tracking and is best against targets facing away (cold) to your plane. This is usually paired with an Electro-Optical or FLIR system on the plane for target acquisition.