rho-thetaadj.n.

Brit.

/rəʊˈθiːtə/, U.S.

/roʊˈθeɪdə/,

/roʊˈθidə/

Origin: Formed within English, by compounding. Etymons: rho n., theta n.

Etymology: < rho n. + theta n., the names of the Greek letters ρ and θ, used symbolically in radar to denote distance and bearing respectively (probably in turn reflecting the use of the same letters in Mathematics to denote distance and bearing from the origin in polar coordinates).

Radar.

A. adj.

Designating a radar navigational system in which the position of aircraft is measured as a distance and bearing from a single ground station; relating to or involving such a system.

ΘΚΠ

the mind > attention and judgement > discovery > instrument for detection > [adjective]

radiogoniometric1923

rho-theta1950

radiotelemetric1964

1950 Aeronaut. Engin. Rev. 9 33/1 The DME inaccuracy can be as great as 3-5 per cent before it begins to affect materially the Rho-Theta system accuracy.

1955 U.S. Patent 2,710,962 7 In either theta-theta or rho-theta operation of the computer, the analog position coordinates of the aircraft with respect to the reference ground station serve as inputs.

1989 S. J. K. Walker in D. H. Middleton Avionic Syst. vii. 156 By 1970, civilian approval had been granted by the Federal Aviation Administration to use short range rho-theta (bearing distance) navigation based on the military standard.

1997 B. J. Uttam et al. in M. Kayton & W. R. Fried Avionics Navigation Syst. (ed. 2) iv. 113 Rho-theta systems provide a unique fix from a single station.

B. n.

A position measured as a distance and bearing from a single ground station. Now rare.

ΚΠ

1950 Navigation 2 vii. 242/1 Knowing the Rho Theta to which he desires to navigate he can..picture it as a point or spot on the card.

1961 Engineering 7 Apr. 479/3 Any type of fix designation, fix identifier, longitude-latitude, relative direction, or rho-theta is accepted by the direct processing routine.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rho-theta
释义	rho-thetaadj.n. Brit. /rəʊˈθiːtə/, U.S. /roʊˈθeɪdə/, /roʊˈθidə/ Origin: Formed within English, by compounding. Etymons: rho n., theta n. Etymology: < rho n. + theta n., the names of the Greek letters ρ and θ, used symbolically in radar to denote distance and bearing respectively (probably in turn reflecting the use of the same letters in Mathematics to denote distance and bearing from the origin in polar coordinates). Radar. A. adj. Designating a radar navigational system in which the position of aircraft is measured as a distance and bearing from a single ground station; relating to or involving such a system. ΘΚΠ the mind > attention and judgement > discovery > instrument for detection > [adjective] radiogoniometric1923 rho-theta1950 radiotelemetric1964 1950 Aeronaut. Engin. Rev. 9 33/1 The DME inaccuracy can be as great as 3-5 per cent before it begins to affect materially the Rho-Theta system accuracy. 1955 U.S. Patent 2,710,962 7 In either theta-theta or rho-theta operation of the computer, the analog position coordinates of the aircraft with respect to the reference ground station serve as inputs. 1989 S. J. K. Walker in D. H. Middleton Avionic Syst. vii. 156 By 1970, civilian approval had been granted by the Federal Aviation Administration to use short range rho-theta (bearing distance) navigation based on the military standard. 1997 B. J. Uttam et al. in M. Kayton & W. R. Fried Avionics Navigation Syst. (ed. 2) iv. 113 Rho-theta systems provide a unique fix from a single station. B. n. A position measured as a distance and bearing from a single ground station. Now rare. ΚΠ 1950 Navigation 2 vii. 242/1 Knowing the Rho Theta to which he desires to navigate he can..picture it as a point or spot on the card. 1961 Engineering 7 Apr. 479/3 Any type of fix designation, fix identifier, longitude-latitude, relative direction, or rho-theta is accepted by the direct processing routine. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < adj.n.1950
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