A phased array can transmit to with-in a small angle, but how does that help the receiver? It is still coming from "the sky", so if you have an airborne jammer

A phased array can transmit to with-in a small angle, but how does that help the receiver? It is still coming from "the sky", so if you have an airborne jammer (EW fighter, drone), how will the receiver what's signal and what's noise? I am aware of the spot beam functionality, which has higher power, which could help with overcoming noise: * https://en.wikipedia.org/wiki/GPS_Block_III#Military_(M-code) https://en.wikipedia.org/wiki/GPS_Block_III#Military_(M-code... The biggest recent help against jamming was the introduction of the L2C signal on a different frequency with the Block IIR-M satellites, and then the more powerful L5 signal on Block IIF.