Abstract：Recognition and parameters estimation of the polyphase-coded radar signals are discussed in this paper. First the code period of the received signals is estimated. When the pulse width and the code period are of prior knowledge, phase modulation of the polyphase-coded signals can be determinated, therefore the local reference signals can be generated and then multiplied with the conjugated received signals. When one of the local reference signals and the received signals had the same modulation mode, the result of multiplication is a sinusoid, thus the polyphase-coded signals can be classified and the carrier frequency can be obtained by estimating frequency of the sinusoid. Finally, the spectral structure is analyzed under asynchronous circumstance. Simulation results show that this method can recognize the polyphase-coded signals at low signal-to-noise ratio and estimate the carrier frequency and code period accurately.
2009, Vol. 31 
