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中文摘要：
针对全球导航卫星系统中使用的交替二进制偏移载波（AhernativeBinaryOffsetCarrier，AhBOC）调制信号存在跟踪模糊的问题，提出了一种非相干鉴相曲线赋形无模糊跟踪方法。该方法使用两个线性组合码与接收信号的互相关组合来实现非相干鉴相曲线。讨论了具有良好抗多径性能的非对称无模糊目标曲线的设定原则。提出了一种基于线性方程组最小二乘解的鉴相曲线赋形方法。给出了针对AltBOC（15，10）导频信道的权值计算结果并设计了易于硬件实现的跟踪环路。仿真结果表明，该方法能够使鉴相曲线在最小二乘意义下接近于目标曲线。设计出的跟踪环路相对于传统的AltBOC无模糊跟踪环路，具有更好的抗噪声和抗多径性能。
英文摘要：
A noncoherent unambiguous tracking method based on the S-curve shaping technique is proposed to solve the ambiguous tracking problem of Alternative Binary Offset Cartier （ AltBOC ） modulated signal used in global navigation satellite systems. In the proposed method, the cross-correlation functions between two linear-combined-codes and the received signal are used to generate the noncoherent S-curve. The principle for setting asymmetrical unambiguous objective curve with outstanding muhipath mitigation performance is discussed. An S-curve shaping technique based on the least square solution of linear equations is proposed. The resulting weights for tracking the pilot signal of AltBOC（15,10） and an tracking loop structure easy to implement are given. Simulation results reveal that the proposed method can make the S- curve close to the objective curve in the sense of the least square criterion. The proposed tracking loop has better performance in tracking accuracy and multipath mitigation than traditional AhBOC unambiguous tracking loops.
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