Thank you. What is the difference between the two read areas showing pulsating beams and appear as blades growing upward and outward from the ground vs. the 6 pointed shape appearing to float over Alaska?
The pointed shape ones are 2D phased array radar. The radar is a grid of 4096 elements. It can observe things anywhere in the sky above it, however there are practical limits to how far off boresight it can operate. These limits are related to the arrangement of the elements, and result in the 6 pointed shape.
The others are 1D phased array radar. They consist of a line of elements rather than a grid. They use a parabolic reflector along the length of the array to focus the radar's observable area to a single line to make up for that missing 2nd dimension. So the reflector limits the radar to only observing across a single line, and the array allows the radar to control where across the line to radiate or listen.
