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提出了利用三次样条插值法,处理BOC调制信号相关谱主峰及副峰的数据,以提高相位测量精度的算法。该算法将低采样频率下的相关谱谱峰分割成n个子区间,在每个区间内建立三次函数,求取极大值点,以确定BOC调制信号的相关谱主峰及副峰的精确位置。重点对比分析了常用的Lagrange插值法,并以Lagrange插值法中的三点二次插值法为例进行了对比仿真试验。仿真分析表明,对于BOC调制信号而言,针对其特殊的同步机制,提出的采用三次样条插值法进行PN码相位测量,可有效提高对其相关峰值及相应的峰值位置的测量精度。
The algorithm of using the cubic spline interpolation method to process the data of the main peak and the secondary peak of the correlation spectrum of the BOC modulated signal is proposed to improve the accuracy of the phase measurement. The algorithm divides the correlation peak at low sampling frequency into n sub-intervals and establishes cubic function in each interval to find the maximum point to determine the exact position of the main peak and the secondary peak of the correlation spectrum of the BOC modulation signal. The commonly used Lagrange interpolation method is compared and analyzed emphatically, and the comparison simulation experiment is carried out with the example of the three point two interpolation in Lagrange interpolation method. Simulation analysis shows that for the BOC modulation signal, the proposed method of cubic spline interpolation for PN code phase measurement can effectively improve the measurement accuracy of the correlation peak and the corresponding peak position for its special synchronization mechanism.