theta-theta

theta-theta

[′thād·ə ′thād·ə]
(navigation)
The generic term for electronic navigation systems in which position is derived by calculations based on the bearing from two or more emitters located at different but accurately known positions.
References in periodicals archive ?
Tenders are invited for Inspection, Supply, Installation, Commissioning, Training And Guarantee Of Theta-Theta X-Ray Diffractometer Along With Accessories And Spares As Per Purchasers Tender Specification Place Of Delivery: Central Stores Unit, Trombay, Mumbai-400 085
Theta-theta creation comes up less frequently, but can be all the more perplexing for its infrequency.
Tenders are invited for Supply of soller slit for primary beam (source side) and secondary beam (detector side) for stoe theta-theta diffractometer serial number 019-01 (goniometer serial #65019)
X-ray diffractometer with a vertical theta-theta goniometer for phase analysis of powdered materials, often containing iron, and for the identification of thin surface layers.
Bragg-Brentano arrangement, and measurement is carried out in a theta-theta mode.