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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(binary offset carrier)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 efficiently without interfering with each other in the limited satellite navigation and positioning system frequency band, a direct acquisition method of spread spectrum signal based on BOC (binary offset carrier) modulation is adopted in this paper. Aiming at the traditional single-sideband processing method, an improved single-sideband mean-value method is proposed, and the peak detection results under different signal-to-noise ratios are simulated by Matlab. The simulation results show that the single-sideband mean-value method can reduce the noise interference, shorten the acquisition time and reduce the probability of mis-capture, so that the acquisition accuracy can be greatly improved.