国防科技大学学报2017，Vol.39Issue(3)：36-40,5.DOI:10.11887/j.cn.201703006
GNSS接收机离散化处理对解扩性能的影响
Discrete processing influence on de-spreading performance of GNSS receiver
摘要
Abstract
The analytical model for the output relations of anti-aliasing filtering,sampling,quantization and de-spreading was established.The formulation of de-spreading output SNR (signal to noise ratio) under the influence of three factors was deduced.Analysis and simulation results show that the total SNR loss can be separated to the product of quantization,filtering and sampling loss when the quantization length up to 4 bit;besides,the optimized clipping level coefficient is only related to quantization length.When the quantization length is less than 4 bit,the total SNR loss approximates to the product of the quantization and sampling plus filtering loss.In the condition of the quantization length up to 4 bit,the filter bandwidth up to 5 times of PN (pseudo-random) code rate,the sample rate up to 4 times of PN code rate,increasing the parameters mentioned above cause the SNR loss less than 0.05 dB,thus the de-spreading performance cannot be increased obviously.Results can be used to optimize the design of the front-end of low-cost global navigation satellite system receiver.关键词
滤波/采样/量化/信噪比/全球导航卫星系统接收机Key words
filtering/sampling/quantization/signal to noise ratio/global navigation satellite system receiver分类
信息技术与安全科学引用本文复制引用
刘小汇,李峥嵘,陈华明..GNSS接收机离散化处理对解扩性能的影响[J].国防科技大学学报,2017,39(3):36-40,5.基金项目
航天支撑基金资助项目(2011-HTGFKD) （2011-HTGFKD）
