摘要
L2C信号是全球定位系统(GPS)从Block IIR-M开始应用的民用时分信号,其数据导频双通道保证了信号捕获较容易实现并且信号跟踪更加稳定。本文对其单通道捕获载波及伪码多普勒精确模型进行了详细的理论推导。L2C信号功率比L1C/A低1.5dB,需要更长累积时间,伪码多普勒会造成较大功率损失,比较了两种捕获算法,并对其中一种提出了修正,修正的算法解决了该算法在码周期较长的情况下出现部分相关值不正确的问题,并通过仿真证明该方法的有效性。
L2C is the civil Time-division signal of GPS which is first applied on Block IIR-M. Its data/pilot structure guarantees not-so-complicated acquisition process and ad- vanced tracking stability at the same time. Accurate carrier and code Doppler model of single channel acquisition is analyzed in detail. The transmission power of L2C is 1.5dB lower than L1 C/A, which leads to longer integration time and code Doppler would cause larger error. Two corresponding acquisition algorithms are analyzed and modification for one algorithm is provided in this essay. The modified algorithm corrects the improper correlation values on the border of code phases under long code period, and the validity of the modified algorithm is proved by simulation.
出处
《全球定位系统》
CSCD
2015年第5期13-18,共6页
Gnss World of China
