<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">synthetic aperture radar</topic></authority><related type="broader"><topic>radar</topic></related> <note xml:lang="en"><![CDATA[ A radar system that uses the motion of the vehicle (such as a spacecraft) carrying it to simulate a system having a much larger antenna area and that is used to obtain high-resolution images of a surface (as of a planet). It requires that the radar be moving in a straight line, either on an airplane or orbiting in space. ]]></note></mads>