Abstract:

For the problem of the identify capability of non-cooperative ship on the sea in the narrow band airborne radar system, the three-dimensional micro-motion equations included yaw, pitch and row of uniform linear moving ship are built firstly. Then the periodicity characteristic and effects to the distance between radar and ship’s scatter point are analyzed. The echo of single frequency continuous wave radar is obtained then, composition and characteristics of echo Doppler frequency are researched finally. Theoretical analyses results show that the three-dimensional micro-motion may lead to spectral expansion and different time-frequency curves of each scattering point. Furthermore, the time-frequency curves change linearly like the linear frequency modulated (LFM) signal in short time, but in long time, they change irregularly in the complex sinusoidal form.