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Abstract
The scattering cross section for an airborne is presented by using the relativity theory and the RCS definition. The relation between RCS and the moving state is simulated. Results show that the RCS is relative to the factors of measuring point and moving state and always has a linear relation with the velocity. The method of determining the static RCS from the moving RCS, the expression of solving aircraft motion are all presented. The results obtained cover the shortage of knowing the moving direction in measuring the velocity with Doppler radar. The results have the characteristics of simplicity and are independent of airborne size and the operating frequency.