Doppler radio Direction Finder is a technology that measures the Angle between radio transmitter and the radio using Doppler effect (Doppler principle).

多普勒无线电测向技术即为利用多普勒效应测定无线电发射设备与接收设备之间夹角的一种技术。

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I am calibrating radio direction finder or adjusting compasses.

我正在校准无线电测向仪或校正指南针。

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In this paper, a Radio Direction Finder system is designed on the basis of the principle of Doppler Diretion Finder technology.

本文在对多普勒无线电测向技术深入研究的基础上设计实现了一套无线电自寻的系统。

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He invented the radio direction finder, autopilot and the first fully automatic aircraft landing system.

FORBES: The Bill Lear I Knew

During the second world war at Marconi he was part of the team that invented a radio direction-finder which was fitted to British bombers.

ECONOMIST: Christopher Cockerell

Though Japanese citizens were able to follow events on radio and TV, it was largely through social networking platforms, such as Google Finder, Facebook and Twitter, that they were able to connect with loved ones and, in many cases send out a call for help for themselves or for those missing or hurt.

FORBES: Amid Japan's Earthquake, Entrepreneurship