基于最小二乘法的高动态条件下抗频偏的精确同步方法

Anti-frequency Offset Method for Precision Synchronization on Highly Dynamic Condition Based on the Least Squares

如何在高动态条件下实现精确同步是当今军事作战中必须解决的一个技术难题。在此条件下,码率偏移和载波频偏会影响精确同步的精度。该文提出一种改进的基于最小二乘法的伪码(PN)相位测量方法,并通过理论分析和仿真验证该方法在高动态条件的精确同步能力。理论推导可知,该方法消除了载波频偏的影响,并且具有强的抗噪声能力。数值仿真说明在选择PN序列不长的情况下该方法对码率偏移不敏感,并证明其具有很强的抗频偏能力。最终得到的测量结果说明该方法不仅有很高的测量精度,同时具有很好的抗噪声和频偏能力。

How to achieve precise synchronization is a technical problem that must be addressed in today＇s military operations in the highly dynamic conditions. In the conditions, the bit rate offset and carrier frequency offset will affect the precise synchronization accuracy. An improved Pseudo Noise （PN） code phase measurement method based on the least squares method is proposed, and the precise synchronization ability of this method in high-dynamic conditions is proved by theoretical analysis and simulation. The theoretical analysis shows that the method can eliminate the impact of carrier frequency offset and be of strong anti-noise ability. While the numerical simulation manifests that this method is not sensitive to bit rate offset when the length of the selected PN sequence is not very long, and proves that it is of strong anti-frequency offset. The measurement results demonstrate that this method not only achieves a high measurement accuracy, but also possesses good anti-noise and anti-frequency offset ability.