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《Chinese Journal of Radio Science》 2001-04
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The applications of m sequence and FH sequence to ionospheric backscattering sounding

YAO Yong gang ZHAO Zheng yu XIE Shu guo HUANG Tian xi (School, of Physics and Electronic Information Science, Wuhan University, Wuhan Hubei 430072, China)  
HF sky wave signals are subjected to long path and complex backscattering propagations before their being detected by radar. To obtain enough information from the received signals, it is necessary to transmit powerful RF signals or to accumulate received signals for a relatively long time. In this paper, we review the methods and examples of Ionospheric backscattering sounding and the basic principle of correlation detection. A correcting algorithm is put forward to improve detecting quality of m sequence. Modem circuits and signal waveforms are provided to indicate the detecting procedure of m and FH sequences. Their performance of gain and noise is discussed and the influence of mobile objects on the ability of detection is analyzed.
【Fund】: 国家自然科学基金资助课题 (No.4 990 4 0 10 )
【CateGory Index】: TN011.2
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