摘要
通过研究自适应天线旁瓣相消系统中相消比与信号相关性的关系,分析了模数转换(ADC)位数和模数转换速率对相消性能的影响,给出最佳相消比和ADC量化位数的定量关系;针对低采样速率导致的相消比下降,提出了基于sinc函数插值来改善相消比的方法,并分析了sinc插值截断长度与相消比的关系。仿真结果表明通过增加AD量化位数和采用sinc插值相消技术,可以明显地改善自适应天线旁瓣相消系统的性能。
An analysis of the effect of number of bits and sample frequency of A/D converting on cancellation efficiency in adaptive antenna side lobe cancellation system is made. Through studying the relation between cancellation ratio and signal correlativity, a quantitative equation between the best cancellation ratio and the number of bits is given. A method based on sinc interpolation for improving performance is presented to overcome the descent of cancellation ratio resulted from lower sample frequency. And an analysis of the relation between truncation length and cancellation ratio is made too. Simulation results show that the performance can be improved by way of increasing the number of bits and using sinc interpolation technique.
出处
《火控雷达技术》
2005年第4期4-7,共4页
Fire Control Radar Technology
基金
国家部委预研基金资助课题(51407010204DZ0125)
关键词
旁瓣相消
量化噪声
采样速率
相消比
side lobe cancellation
quantized noise
sample frequency
cancellation ratio
