Micro-Doppler effect of cooperative spinning target

As to the issue of precious velocity measurement, micro-Doppler model of cooperative target was established. First, launch coordinate system was introduced to discuss conveniently. Second, two models of micro-Doppler of cooperative target were deduced. Under the condition of receiving with PLL and transponder of frequency converting, monostatic model of micro-Doppler of cooperative target was derivate. The corresponding formula showed that a transpond ratio was multiplied to expression of reflective radar. The formula of bistatic model illustrated that except the factor of the transpond ratio, there were two additive minor items of cross components. Therefore, the expression to calculate the frequency shift of cooperative micro-Doppler was given. The model was verified by simulation at last.