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利用最小二乘(LS)法可以实现PN码相位的精确测量,但该方法对粗同步要求高,难以满足实际工程需求。给出了一种新的累加LS法的实现结构,在该结构下根据鉴相曲线的波形变化特征,利用累加后的离散鉴相曲线的最大值和最小值点作为特征基准点,取最值之间的数据进行LS线性拟合,实现粗同步于半个码元宽度以内的伪码相位精确测量。理论分析表明,该方法的鉴相特性呈线性特征,可以有效使用累加LS线性拟合方法。仿真结果表明,该方法相比于其他方法使用范围更广,测量精度更高。
The least square (LS) method can be used to accurately measure the PN code phase. However, the method requires high coarse synchronization and can not meet the actual engineering requirements. A new structure of the additive LS method is given. According to the waveform characteristics of the phase-change curve, the maximum and minimum points of the accumulated discrete phase-difference curve are used as feature datum points, LS linear fitting between the data to achieve coarse synchronization within the half-symbol width within the pseudocode phase accurate measurement. The theoretical analysis shows that the phase discrimination characteristic of the method is linear, and the additive LS linear fitting method can be effectively used. The simulation results show that this method has a wider range of use than other methods and the measurement accuracy is higher.