Methods Color Doppler flow image(CDFI) combined with pulsed wave Doppler(PW) was used to define the course of vertebral artery and determine the parameters of blood flow for comparative study between two groups: patient group(30 patients with stenotic vertebral artery's inner diameter <2.

This paper introduces the methods of setting the jamming power, azimuth jam-delay, distance jam-delay and Doppler frequency-shift in the process of jamming the general radar.

In the satellite navigation and positioning system,Doppler frequency-shift is the key problems that degrade the performance of satellite receiver.

The production of Doppler frequency-shift is analyzed under the high dynamic condition.

The blood flow of the main renal artery and segmental renal vessels before and after the sclerotherapy were measured by Doppler spectrum, meanwhile, another 20 cases were chosen as c.

In the algorithm the doppler spectrum of sea clutter is di- vided into the so-called platform motion spectrum and the sea-echo spectrum.

Detection of Doppler shift based on excitation bifurcation of duffing oscillator;

Acquisition method of the Doppler shift based on the Costas loop;

Research on the method of elimination of the Doppler shift in the TDRSS;