Range gate

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"The resolution of radar data decreases with distance from the radar. A "range gate" is the area encompassed by one pixel of radar data. These range gates become larger with increasing distance from the radar site since the beam is expanding as it moves away from the radar site. Large range gates will result in less resolution. An analogy is to think of two computer images where one looks crisp and sharp while another looks grainy. The grainy image has larger pixels and thus has a poorer resolution."