In the Harpoon series I use the intermittent sensors to fix enemy units, especially aircraft, without becoming an easy target for them to find. Sometimes, it serves to draw them too. Because they cannot fix my position, they are bound to get closer until falling into my trap.
It is especially useful when you have multiple units and not enough time to trigger each unit sensor manually. These blinking sensors may also be useful to confuse and take down some ECM defenses.
This sensor configuration is like a light switch that can be set for intermittent use. A few moments turned on, others turned off.
Many units can benefit from this feature. Airplanes, helicopters, mobile SAMs, escort ships chasing submarines with their sonar, among others.
The texts attached in Baloogan's post explained it very well.