In HF groundwave shipborne bistatic radar, the movement of radar can make the system more complex. This paper analyses the geometrical change of the mobile bistatic system, and the effect of the geometrical change to the LFMICW signal echo of target,and anylyses the relationship between phase of the intermediate frequency signal of target echo and the movement of radar in detail, and simply discusses the method to get the range and velocity of target in the complex dynamic system. Finally, the result of simulation proves the broadening of target doppler frequency when the target is near to the radar.
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