量化位数对导航直扩接收机相关处理的影响研究

Research on Bit Influence on AD Quantization Length in DS Digital Receiver

A/D转换是直扩数字接收机设计的关键技术之一,文中主要考虑量化比特数的选取,分析不同量化位数对相关峰信噪比、载波跟踪误差和码跟踪误差的影响,在高斯白噪声的条件下给出了系统信噪比的计算公式和定量分析结果。理论分析和实际测试结果表明:采用较低的转换位数不会急剧恶化含有高斯噪声的扩频信号的信噪比,采用4bit量化,可获得较好的接收机性能,量化位数对直扩信号检测的影响是有限的。

It's important to decide the AD quantizatian length for the design of a direct spread spectrum receiver.The length of AD quantization has influences on the SNR,tracking error of the carrier wave and pseudo-random sequences.On the condition of white Gauss noise,the formula of SNR is gotten and the quantitative analysis is presented.The test results indicate that the receiver has good performance when the quantization length of DS signal is 4 bit,the less length would not sharply deteriorate the SNR,and the length of AD quantization has finite influences on the DS signal detection.