Abstract
The design results of the polyphase codes used as noise radar waveforms are presented. The simulated annealing algorithm is applied to minimize the objective function, which is defined as the sidelobe level of the auto-correlation function of each polyphase code. Optimal codes are designed in a short computation time in the case of several code lengths and phase distinct numbers, and their relationship to the sidelobe level is analyzed. In particular, even if the code length is greater than 10,000, optimal codes can be obtained. In addition, by applying the characteristics of the phase shift caused by the Doppler shift of the moving target to the definition of the objective function, we can design the polyphase codes where sidelobes do not increase significantly in spite of the Doppler phase shift.
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