Effect of chip rate on the ranging accuracy in a regenerative pseudo-noise ranging system  

作　　者：Jian-wen JIANG Wei-jun YANG Chao-jie ZHANG Xiao-jun JIN Zhong-he JIN 

机构地区：[1]Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2011年第2期132-139,共8页浙江大学学报C辑（计算机与电子（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (No. 60904090);the Postdoctoral Science Foundation of China (No. 20080431306);the Special Postdoctoral Science Foundation of China (No. 20081458)

摘　　要：The ranging accuracy of a pseudo-noise ranging system is mainly decided by range jitter and time delay discrimination. Many factors can affect the ranging accuracy, one of which is the chip rate. In digital signal processing, the time delay discrimination and autocorrelation function of sampled ranging sequences of different chip rates are very different. An approximation simulation model is established according to an in-phase quadrature (I/Q) correlator which is used to evaluate the time delay. Simulation results of the range jitter and time delay discrimination show that the chip rate which provides a non-integer sample-to-chip rate ratio can achieve a higher ranging accuracy, and some test results validate the simulation model. In some design missions, the simulation results may help to select an optimum sample-to-chip rate ratio to satisfy the design requirement on the ranging accuracy.The ranging accuracy of a pseudo-noise ranging system is mainly decided by range jitter and time delay discrimination Many factors can affect the ranging accuracy, one of which is the chip rate. In digital signal processing, the time delay discrimi- nation and autocorrelation function of sampled ranging sequences of different chip rates are very different. An approximation simulation model is established according to an in-phase quadrature （I/Q） correlator which is used to evaluate the time delay. Simulation results of the range jitter and time delay discrimination show that the chip rate which provides a non-integer sample- to-chip rate ratio can achieve a higher ranging accuracy, and some test results validate the simulation model. In some design missions, the simulation results may help to select an optimum sample-to-chip rate ratio to satisfy the design requirement on the ranging accuracy.

关 键 词：Ranging accuracy Range jitter Time delay discrimination Sample-to-chip rate ratio Integration time Autocorrelation function Fractional chip period delay 

分 类 号：TN96[电子电信—信号与信息处理]