在有限的卫星导航定位系统频带中为了合理有效的利用频率资源而又不相互干扰,文中采用了基于BOC(binaryoffsetcarrier)调制方式的扩频信号直接捕获方法。针对传统的单边带处理法,提出了一种改进的单边带均值法,并对不同信噪比下的峰值检测结果进行了Matlab仿真。仿真结果表明,单边带均值法能减小噪声干扰缩短捕获时间、减小误捕的概率,能使捕获精度得到大大提高。

In order to use the frequency resources rationally and effectively and not interfere with each other in a limited band of satellite navigation and positioning system, the direct spread-spectrum signal acquisition based on BOC modulation method was used. An improved single side band (SSB) average method was proposed for the traditional SSB processing method and its performance was analyzed. The simulation results show that SSB average method can effectively reduce the noise, and more significant result can be obtained. Compared with conventional SSB processing method, the improved algorithm can greatly reduce the acquisition time, reduce the error rate, and the capture accuracy is improved greatly. It is a fast and effective BOC modulation acquisition algorithm.