obstacle
51obstacle race — noun a race in which competitors must negotiate obstacles • Hypernyms: ↑footrace, ↑foot race, ↑run * * * obstacle racer. a foot race in which the contestants are prevented in a specific way from covering the full course at top speed, as by having …
52obstacle-clearance altitude (OCA)/obstacle-clearance height — The lowest altitude or height above the elevation of the relevant runway threshold or the airport elevation as applicable, used in compliance with appropriate obstacle clearance criteria. Obstacle clearance altitude is referenced to mean sea… …
53Obstacle Collision Avoidance System — The Obstacle Collision Avoidance System (OCAS) is designed to alert pilots if their aircraft is in immediate danger of flying into an obstacle. OCAS uses a low power ground based radar to provide detection and tracking of an aircraft s proximity… …
54obstacle belt — A brigade level command and control measure, normally given graphically, to show where within an obstacle zone the ground tactical commander plans to limit friendly obstacle employment and focus the defense. It assigns an intent to the obstacle… …
55Obstacle avoidance — In robotics, obstacle avoidance is the task of satisfying some control objective subject to non intersection or non collision position constraints. Normally obstacle avoidance is considered to be distinct from path planning in that one is usually …
56obstacle course — UK / US noun [countable] Word forms obstacle course : singular obstacle course plural obstacle courses 1) a series of objects or structures that you have to get over, under, or through in an obstacle race or in a training exercise 2) a series of… …
57obstacle, impediment — Each of these words refers to something that prevents, or interferes with, progress or action. An obstacle is anything that stands in the way of literal or figurative progress: Lack of money was an obstacle to this medical student. A roadblock… …
58obstacle assessment surface — A defined surface intended for the purpose of determining those obstacles to be considered in the calculation of obstacle clearance altitude/height for a specified ILS (instrument landing system) facility and procedure (ICAO). See also obstacle… …
59obstacle race — UK / US noun [countable] Word forms obstacle race : singular obstacle race plural obstacle races a type of race in which you have to get over, under, or through a series of objects or structures …
60Obstacle Free Zone — The Obstacle Free Zone (OFZ) is a three dimensional volume of airspace below 150 feet (46 m), above the established airport elevation which protects for the transition of aircraft to and from the runway. The Obstacle Free Zone (OFZ) clearing …
