Based Upon the physical model of back scatting signals in Ship Borne Surface Wave Radar(SBSWR)

the spectrum broadening equation of the echo signals in SBSWR

which reveals the relations among the movement of radar platform

the radar system parameters

the target physical attributes and target moving characteristics

is theoretically formulated in the terms of Doppler frequency.The influence of a moving radar platform on the high frequency phases of the radar echoes and on the Doppler spectrum structures of the echoes are analyzed in detail.The dynamic geometrical relations embedded between the moving radar platform and the targets with different phy sical dimensions and with different moving states are given.In addition

the expressions of the bro adening spectrum of the signals from the static targets and the moving targets are presented respectively.These essential relations lay a theoretical basis for analy zing the characteristics of sea clutter and of targets

and for resolving the targets from the broad ened first order Bragg lines in SBSWR as well.Finally

the correctness of the mathematic expressions presented in the article is proved by the data gathered from a preliminary field experiment which is conducted to evaluate and demonstrate several aspects of the SBSWR in September 8 1998.