信号量化对导航系统抗干扰性能的影响分析  

Influence of Signal Quantization on Anti-jamming Performance of Navigation System

作　　者：王海洲 郭承军[1] WANG Hai-zhou;GUO Cheng-jun(Research Institute of Electronic Science and Technology,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学电子科学技术研究院,成都611731

出　　处：《科学技术与工程》2018年第11期260-263,共4页Science Technology and Engineering

摘　　要：在导航信号的接收过程中,量化是至关重要的环节。模数转换中的量化会带给卫星信号信噪比(SNR)的损失,对导航系统的抗干扰性能有一定的影响。在连续波干扰和白噪声的环境下分析得到了不同量化比特数和量化门限下系统输出信噪比的计算公式,并且对信号进行了仿真分析,得到信号量化前后信噪比变化曲线。结果表明:随着干扰幅度的增加,信号量化间隔需要相应增大才能保证信号信噪比损耗较小,同时需要注意量化间隔的变化对信噪比降低具有较大的影响。Quantization is a crucial part in the reception of navigation signals.Quantization in analog-to-digital transform will bring the loss of the satellite signal signal-to-noise ratio(SNR),which has an impact on the anti-jamming performance of navigation system.The formulas for calculating the output SNR under different quantization bits and quantization threshold are obtained under the condition of continuous wave interference and white noise,and the signal is simulated and analyzed,then the SNR changing curve before and after signal quantization is obtained.The results show that with the increase of interference amplitude,the quantization interval of signal needs to increase correspondingly to ensure that SNR loss is small.At the same time,it is necessary to note that the change of quantized interval has a great influence on the reduction of the SNR.

关 键 词：量化 导航信号 抗干扰 信噪比 

分 类 号：TN965.5[电子电信—信号与信息处理]