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Linfei Chen 《Optik》2006,117(3):107-110
Starting from the relationship between the Wigner transformation and the fractional Fourier transform (FRFT), we apply the FRFT to the spatial filtering. In the process of filtering, the noise can be simulated as the chirp functions or their linear combination, which can be filtered at the corresponding fractional planes, and also the actual positions can be exactly obtained. Some numerical simulations prove its possibility. 相似文献
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Asymptotic properties of the least squares estimators of the parameters of the chirp signals 总被引:1,自引:0,他引:1
Chirp signals are quite common in different areas of science and engineering. In this paper we consider the asymptotic properties
of the least squares estimators of the parameters of the chirp signals. We obtain the consistency property of the least squares
estimators and also obtain the asymptotic distribution under the assumptions that the errors are independent and identically
distributed. We also consider the generalized chirp signals and obtain the asymptotic properties of the least squares estimators
of the unknown parameters. Finally we perform some simulations experiments to see how the asymptotic results behave for small
sample and the performances are quite satisfactory. 相似文献
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针对Chirp 信号的帧同步处理, FRFT(Fractional Fourier Transform)变换或匹配相关方案计算量过大、难以在stm32 等硬件平台实现实时处理的问题, 对在复杂水声信道条件下获得信号帧的精确同步基准进行研究,通过检测连续的3 个单频信号实现粗同步, 利用去斜压缩方法处理Chirp 信号实现细同步的帧同步。仿真测试该帧同步方案在不同信道下同步时刻误差, 并对采用匹配相关和FRFT 变换进行细同步处理的方案进行比较,去斜压缩方案虽性能不如匹配相关方案, 但却有更小的计算量。用icroe2 平台等硬件实现去斜压缩帧同步方案, 通过噪声衰减和水池环境进行测试, 验证了该方案的可行性。 相似文献
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针对Chirp体制的雷达,讨论在目标高速运动与静止时相参积累效果的变化及其原因,提出了一种适合某系统的解决办法,并通过仿真验证了其有效性。 相似文献
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以经典耦合模理论为基础,结合线性啁啾莫尔光纤光栅的结构特性,给出了线性啁啾莫尔光纤光栅的耦合系数和耦合模方程,并用龙格库塔迭代法数值求解耦合模方程.对多种线性啁啾莫尔光纤光栅的光谱特性和时延特性进行了理论模拟.分析结果表明,线性啁啾莫尔光纤光栅的相移特性和切趾特性,使得该类型光栅在波分复用全光网中有着很好的应用前景. 相似文献
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单模光纤中蓝移啁啾和红移啁啾斜率的最佳匹配 总被引:4,自引:0,他引:4
从理论上分析了自相位调制(SPM)引起的频率啁啾和群速度色散(GVD)引起的频率啁啾的传输特性,讨论了SPM和GVD频率啁啾的斜率匹配和导致两者啁啾斜率匹配的最佳输入功率。 相似文献