基于改进Rake模型的多径BOC信号精确捕获方法

针对多径二进制偏移载波(binary offset carrier，BOC)信号自相关函数的多峰性导致的捕获模糊性问题,提出了一种基于改进Rake模型的精确捕获方法。该方法依据Rake接收机可以有效利用多径分量的优点,首先将接收的多径BOC信号分离后经过带有载波相位估计功能的Rake模型,得到了采用最大比合并方法后的近似单径信号,然后采用带有频偏校正的相关重构方法对BOC信号进行捕获,并详细阐述了相关重构原理。理论和计算机仿真分析表明,在同一条件下,该方法较其他方法具有精度高、易实现的优点,且BOC信号阶数越高效果越好。

Accurate acquisition method of multipath BOC signals based on improved Rake model

For the problem of ambiguous acquisition of multipath binary offset carrier (BOC) signals, a method which is based on the Rake model is proposed. Firstly, the received signals are separated and pass through the Rake model with carrier phase estimation. Then the approximate single-path signal is gotten by using the method of the maximum ratio combining. Finally, BOC signals are captured by the method of relevant reconstruction with the compensation of frequency offset and its detail theory is given. Theoretical analysis and computer simulations show that, under the same conditions, this method has the advantage of high accuracy and is easy to be implemented compared with other methods, and the higher the modulation order, the better the performance.