1 VDF? Very – high – frequency Direction Finder?

2 I am calibrating radio direction finder or adjusting compasses.

3 In this paper, the direction finder information processing and controlling system is designed.

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

5 This paper introduces the design idea of Lightning Direction Finder and lightning return stroke models. The technique of accurate orientation as well as its realization is discussed.

6 With the development of Doppler Radio Direction Finder technology, it is utilized in many aspects. It is especially important for radio recon and radio detector.

7 A vector amplitude weighing method of direction finder composed of ridged horns is presented and analyzed using results of test.

8 A radio direction finder system is designed on the basis of the principle of Doppler Direction Finder technology.

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

10 The first section of this paper discusses the theory of the Doppler Radio Direction Finder technology.

11 Function test and calibration self - heterodyne curve for direction finder on sea trial.

12 The hardware of this system consists of antenna array, Doppler direction finder, system controller and display. The software-work mode controller,[] data processing and angle display.

13 We also analysed the influence of amplitude modulation and frequency (or phase ) modulation on Interferometer Direction Finder.

14 This article discourse upon the principle and system construction of Interferometer Direction Finder.