| 释义 |
rho-theta|rəʊˈθiːtə|
[The Greek letters ρ (rho) and θ (theta), used symbolically in radar to denote distance and bearing respectively.]
Used attrib. to denote radar navigational systems in which the position of aircraft is measured as range and bearing from a single ground station. Also absol., denoting a position measurement.
1957Electronics 1 June 156 (heading) Vortac beacons for rho-theta navigation. 1961Engineering 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. 1975D. G. Fink Electronics Engineers' Handbk. xxv. 94 In ICAO practice, the DME is nearly always associated with a VOR, the two systems forming the basis for a rho-theta area navigation system. |