Geometric Analysis on Moving Targets and First-order Sea Clutters in Bistatic Shipborne SWR

The geometric relationship between a bistatic radar and targets is highly complicated when they are moving with different velocities and headings. Target motion equations, which are used to describe the complex dynamic system´s characteristics, is derived based upon the Cartesian coordinate systems established both on the transmitter (CCST) platform and on the receiver (CCSR) platform of the bistatic radar system. The results show that the instantaneous ranges between a target and the transmitter platform (TP) and the receiver platform (RP) contain a time-variable tangential component and a time-variable radial component. The Doppler-broadening mechanism of first-order sea clutters in bistatic shipborne surface wave radar (SWR) is analyzed based on the results derived above, and the conclusion shows that there exists dynamic broadened component in the broadened Doppler spectrum resulted from the difference of the motion between TP and RP