随机信号实时重构的快速算法及其DSP实现  

A Fast Realtime Reconstruction Algorithm of Random Signal and DSP Realization

作　　者：穆常青[1] 潘明海[1] 刘峰[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《现代电子技术》2006年第5期137-139,共3页Modern Electronics Technique

摘　　要：针对随机信号重构过程中在保证重构信噪比达到50dB时进一步提高实时性,提高频率分辨率这一目的,提出了一种可由DSP实现的快速算法。该方法基于傅里叶变换的共轭对称性,对功率谱做了特殊对称化处理,以保证重构得到的信号短序列的实对称化,从根本上降低了运算量,减小了从主机向DSP下传数据的压力。实践证明,相较以往方法,该算法可将重构过程的运算量降低一半,频率分辨率提高4倍,可以广泛应用于地、海雷达杂波信号重构、随机振动台振动信号再现等信号实物、半实物仿真领域。For the higher real-time and frequency resolution request in the process of random signal reconstruction with SNR up to 50dB,a fast algorithm which can be realized by DSP is presented. Based on the property of Fourier translation, this algorithm deals with power spectrum in order to make signal sequence real and symmetrical. After these operation, the computation and the pressure of transmitting data from PC to DSP is radically reduced. It is proved that using this algorithm, the computation decreases to a half, resolution increases to four times compared with methods before. This algorithm can be widely used in simulation analysis of random signal such as the reconstruction of radar clutter and rebuilding of random oscillation.

关 键 词：实时重构 随机信号 功率谱 数字正交调制 重构信曝比 多相滤波器 

分 类 号：TN911[电子电信—通信与信息系统]