airborne profile recorder
Also found in: Acronyms.
airborne profile recorder[′er‚bȯrn ′prō‚fīl ri‚kȯrd·ər]
An electronic instrument that emits a pulsed-type radar signal from an aircraft to measure vertical distances between the aircraft and the earth's surface. Abbreviated APR. Also known as terrain profile recorder (TPR).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.