According to the principle of view the Doppler frequency detection, the detector makes up of the transmitter, the transfer circuit, receiver and signal processing circuit.

If we want to make use of Doppler technique of the ships in navigational radar, first we must get the Doppler frequency, but the related circuit is very complicated, therefore, the cost of the radar is very much.

In the application of Doppler radar,controlling the rotation speed of antenna i.

The paper presents a kind of analysis of frequence- time relation according to characteristic of dopller signal and gives calculating results of a practical signal.

To develop the passive acoustic detecting intellectual mine fuse of antiarmed helicopter,this paper presents a method of the motional parameter estimation of he-licopter target through processing the Doppler shift equation of helicopter noise signal byweighted least square algorithm on the basis of analysing helicopter noise signal received inthe acoustic detecting array.

A digital Doppler filtering technique with acceleration compensation;