一种基于多普勒改进的BDS单频观测值周跳探测与修复法

A Method of Detecting and Repairing Cycle-slip Based on Doppler Improved BDS Single-frequency Observations

针对多普勒探测法对小周跳探测精度不足的缺点,提出一种改进的北斗系统(BDS)单频观测值周跳探测法.首先,利用多普勒观测值检测时,使用固定窗口滑动的方式对初始数个历元的多普勒值进行拟合得到拟合曲线,接着对拟合曲线进行积分得到多普勒变化量,然后用多普勒变化量与载波相位进行周跳探测,最后以高次差的方式将前后历元探测出的值进行历元求差,差值为最后探测出的周跳值.对实测BDS数据进行周跳探测,试验证明:改进的多普勒周跳探测法探测小周跳的能力明显增强,具有方法简单、可靠等优点,探测精度可达0.1周且修复效果较优.

Considering the limitation of Doppler detection method, an improved cycle-slip detection and repairation method is proposed for single-frequency BDS （Bei- Dou System） receivers. Firstly, a sliding way of fix windows is used for polynomial fitting of the initial Doppler value. Then, the Doppler shift is obtained by integrating the fitting curve. The values are used to detect the cycle-slip with carrier phase. Fi- nally, the detection value of current epoch minus the detection value of the previous epoch is the cycle-slip. The measured data of BDS are used to perform the cycle-slip detection. Experiments show that the detective capability of tiny cycle-slip of the im- proved method is better than the traditional Doppler detection method. The improved Doppler detection method has overriding advantages in simplicity and reliability, etc. Measured accuracy can reach 0.1 cycle.