Carrier frequency and symbol rate estimation are the main contents of parameter estimation,which is the basis of modulation recognition and further processing of signals especially in non-cooperative communication.Wit...Carrier frequency and symbol rate estimation are the main contents of parameter estimation,which is the basis of modulation recognition and further processing of signals especially in non-cooperative communication.With the development of wireless communication,the signal transmission environment has become increasingly bad,causing more difficulties in parameter estimation.It is well known that the signal cycle spectrum is robust to noises and signal parameters are closely related.In practice,it is impossible to calculate the cyclic spectrum of infinite length data signals.When using finite length data to obtain a cycle spectrum,the truncation noise is induced,resulting in interference.It is necessary to overcome the influence of noises in order to improve the detection ability of discrete spectral lines.An improved method of the discrete spectral line extraction algorithm is proposed by reflecting the amplitude advantage of discrete spectral lines through salient features of continuous noises in discrete spectral line neighborhood.展开更多
随着雷达信号处理技术的发展,对于宽带线性调频(Linear Frequency Modulation)信号发生器的需求也变得十分迫切。基于Xilinx公司的直接数字频率合成(Direct Digital frequency Synthesis,DDS)IP核和高速数模转换器(Digital-to-Analog Co...随着雷达信号处理技术的发展,对于宽带线性调频(Linear Frequency Modulation)信号发生器的需求也变得十分迫切。基于Xilinx公司的直接数字频率合成(Direct Digital frequency Synthesis,DDS)IP核和高速数模转换器(Digital-to-Analog Converter,DAC)的架构,设计了一种可实时切换参数的多相宽带线性调频信号发生器,并完成仿真和上板验证。经仿真和上板验证,该信号发生器能够根据任务要求实时切换线性调频信号的参数,生成的信号指标准确,实现方法可靠,具有一定的实用价值。展开更多
基金supported by the National Key R&D Program of China(2016YFB0800203)
文摘Carrier frequency and symbol rate estimation are the main contents of parameter estimation,which is the basis of modulation recognition and further processing of signals especially in non-cooperative communication.With the development of wireless communication,the signal transmission environment has become increasingly bad,causing more difficulties in parameter estimation.It is well known that the signal cycle spectrum is robust to noises and signal parameters are closely related.In practice,it is impossible to calculate the cyclic spectrum of infinite length data signals.When using finite length data to obtain a cycle spectrum,the truncation noise is induced,resulting in interference.It is necessary to overcome the influence of noises in order to improve the detection ability of discrete spectral lines.An improved method of the discrete spectral line extraction algorithm is proposed by reflecting the amplitude advantage of discrete spectral lines through salient features of continuous noises in discrete spectral line neighborhood.
文摘随着雷达信号处理技术的发展,对于宽带线性调频(Linear Frequency Modulation)信号发生器的需求也变得十分迫切。基于Xilinx公司的直接数字频率合成(Direct Digital frequency Synthesis,DDS)IP核和高速数模转换器(Digital-to-Analog Converter,DAC)的架构,设计了一种可实时切换参数的多相宽带线性调频信号发生器,并完成仿真和上板验证。经仿真和上板验证,该信号发生器能够根据任务要求实时切换线性调频信号的参数,生成的信号指标准确,实现方法可靠,具有一定的实用价值。
