The transports of the dynamic biochemical signals in the non-reversing pulsatile flows in the mixing microchannel of a Y-shaped microfluidic device are ana- lyzed. The results show that the mixing micro-channel acts a...The transports of the dynamic biochemical signals in the non-reversing pulsatile flows in the mixing microchannel of a Y-shaped microfluidic device are ana- lyzed. The results show that the mixing micro-channel acts as a low-pass filter, and the biochemical signals are nonlinearly modulated by the pulsatile flows, which depend on the biochemical signal frequency, the flow signal frequency, and the biochemical signal transporting distance. It is concluded that, the transfer characteristics of the dynamic biochemical signals, which are transported in the time-varying flows, should be carefully considered for better loading biochemical signals on the cells cultured on the bottom of the microfluidic channel.展开更多
针对利用雷达信号调制通信信息提高雷达低占空比脉冲发射形式下的通信速率时,信号自相关旁瓣较高的问题,提出一种基于非线性调频(nonlinear frequency modulation,NLFM)信号的雷达通信一体化信号形式。首先,结合连续相位调制(continuous...针对利用雷达信号调制通信信息提高雷达低占空比脉冲发射形式下的通信速率时,信号自相关旁瓣较高的问题,提出一种基于非线性调频(nonlinear frequency modulation,NLFM)信号的雷达通信一体化信号形式。首先,结合连续相位调制(continuous phase modulation,CPM)建立了NLFM-CPM一体化信号模型。然后,根据雷达自相关性能准则与分辨性能准则,在匹配滤波的处理方案下,分析了一体化信号的调制参数对雷达探测性能的影响。最后,分析了调制参数对通信性能的影响。仿真结果表明,该信号在不损失雷达主瓣能量、距离与速度分辨率以及兼顾通信可靠性的前提下,可实现低于-35dB的自相关旁瓣。展开更多
This paper presents a method on non-linear correction of broadband LFMCW signal utilizing its relative nonlinear error. The deriving procedure and the results simulated by a computer and tested by a practical system a...This paper presents a method on non-linear correction of broadband LFMCW signal utilizing its relative nonlinear error. The deriving procedure and the results simulated by a computer and tested by a practical system are also introduced. The method has two obvious advantages compared with the previous methods: (1) Correction has no relation with delay time td and sweep bandwidth B; (2) The inherent non-linear error of VCO has no influence on the correction and its last results.展开更多
针对高动态环境下突发信号检测问题,提出基于高阶项逐级消去的非线性调频(non-linear frequency modulation,NLFM)信号参数估计算法,利用合理近似,将其转化为相对简单的线性调频(linear frequency modulation,LFM)信号参数估计问题,并...针对高动态环境下突发信号检测问题,提出基于高阶项逐级消去的非线性调频(non-linear frequency modulation,NLFM)信号参数估计算法,利用合理近似,将其转化为相对简单的线性调频(linear frequency modulation,LFM)信号参数估计问题,并提出两级调频率逼近法用于LFM信号参数估计,具有原理简明、计算复杂度低等特点,便于实际工程应用.针对接收信号功率动态变化的问题,提出自适应快速傅里叶变换(fast Fourier transform,FFT)峰均比门限信号检测算法.仿真结果表明,所提算法能够在信噪比为-27dB的高动态环境下准确实现信号检测与参数估计.展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.11172060 and11672065)
文摘The transports of the dynamic biochemical signals in the non-reversing pulsatile flows in the mixing microchannel of a Y-shaped microfluidic device are ana- lyzed. The results show that the mixing micro-channel acts as a low-pass filter, and the biochemical signals are nonlinearly modulated by the pulsatile flows, which depend on the biochemical signal frequency, the flow signal frequency, and the biochemical signal transporting distance. It is concluded that, the transfer characteristics of the dynamic biochemical signals, which are transported in the time-varying flows, should be carefully considered for better loading biochemical signals on the cells cultured on the bottom of the microfluidic channel.
文摘针对利用雷达信号调制通信信息提高雷达低占空比脉冲发射形式下的通信速率时,信号自相关旁瓣较高的问题,提出一种基于非线性调频(nonlinear frequency modulation,NLFM)信号的雷达通信一体化信号形式。首先,结合连续相位调制(continuous phase modulation,CPM)建立了NLFM-CPM一体化信号模型。然后,根据雷达自相关性能准则与分辨性能准则,在匹配滤波的处理方案下,分析了一体化信号的调制参数对雷达探测性能的影响。最后,分析了调制参数对通信性能的影响。仿真结果表明,该信号在不损失雷达主瓣能量、距离与速度分辨率以及兼顾通信可靠性的前提下,可实现低于-35dB的自相关旁瓣。
文摘This paper presents a method on non-linear correction of broadband LFMCW signal utilizing its relative nonlinear error. The deriving procedure and the results simulated by a computer and tested by a practical system are also introduced. The method has two obvious advantages compared with the previous methods: (1) Correction has no relation with delay time td and sweep bandwidth B; (2) The inherent non-linear error of VCO has no influence on the correction and its last results.
文摘针对高动态环境下突发信号检测问题,提出基于高阶项逐级消去的非线性调频(non-linear frequency modulation,NLFM)信号参数估计算法,利用合理近似,将其转化为相对简单的线性调频(linear frequency modulation,LFM)信号参数估计问题,并提出两级调频率逼近法用于LFM信号参数估计,具有原理简明、计算复杂度低等特点,便于实际工程应用.针对接收信号功率动态变化的问题,提出自适应快速傅里叶变换(fast Fourier transform,FFT)峰均比门限信号检测算法.仿真结果表明,所提算法能够在信噪比为-27dB的高动态环境下准确实现信号检测与参数估计.
