You are here: Home Dictionary radar
Personal tools

radar

Abbreviation for "radio detection and ranging" - how to detect objects, and measure their distance, by means of sending out radio waves and detecting their reflection. Widely used in air and sea traffic; for general relativity, radar is of interest as radar signals reflected by planets can be used to measure the Shapiro delay - the fact that it takes those signals passing close to the sun a little longer to reach us than expected by classical physics.