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The Classification and Parameter Estimation of the Phase Modulation Radar Signal

Author: LiQiWen
Tutor: LiuYu
School: Nanjing University of Aeronautics and Astronautics
Course: Communication and Information System
Keywords: modulation classification polyphase coded signals detection phase coded signals symbol width symbol synchronization
CLC: TN957.51
Type: Master's thesis
Year: 2009
Downloads: 74
Quote: 4
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Abstract


This paper discusses modulation classification of the polyphase coded signals,binary phase coded signals and quadrature phase coded signals which are used in the field of pulse compression radar universally. Various modulation modes of signals may be employed. The thesis tries to determine whether the received are phase coded signals and then figure out the specific types of phase modulation. According to the instantaneous frequency distinctive features of the signals between the phase coded signals and other modulation signals, the method of phase coded signal modulation classification is proposed based on the algorithm of phase unwrapping, linear fitting and kurtosis coefficient. After analyzing the details of the phase coding patterns of polyphase coded signals, the results of the correlation operation which is proposed in the paper are found to change with particular rules. Then a solution of polyphase coded signals detection based on the DFT is concluded, which provides a correct precondition to the modulation classification of polyphase coded signals. It is proved to perform well at low signal to noise ratio. This paper discovers the drawbacks of modulation recognition of binary phase coded signals and quadrature phase coded signals based on the cumulants in the process of research. An improved modulation classification method is suggested to make up for the weakness of the previous method effectively.Most of the method of modulation classification phased coded signals acquire their precise symbol width and symbol synchronization. This thesis presents an accurate and simple method of symbol width estimation with the combination of Haar wavelet transformation and linear fitting. And approach to symbol synchronization is derived from the distribution regularity of modulus maximum.Lots of simulations prove that the algorithms of modulation classification of phase coded signals in the thesis are correct and effective. The method of the phase coded signals categorization, the polyphase coded signals detection and the classification of the binary phase coded and quadrature phase coded signals based on cumulants have realistic significance for reference.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Radar signal detection and processing
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