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脉冲超宽带测控新体制可有效提高测控系统的安全性能,且具有潜在的高精度测距能力。为了实现其高精度测距功能,提出了一种基于延迟锁定环路的脉冲超宽带测控信号时延精密跟踪方法。该方法在传统伪码跟踪环的基础上进行改进,利用基于非相干积分的非线性反馈环路对接收信号的脉冲相位进行精密跟踪。理论分析和仿真结果表明,该延迟锁定环路可以完成对脉冲超宽带测控信号的时延精密跟踪。与直扩测控信号相比,在相同条件下,脉冲超宽带测控信号的时延跟踪相对误差更大,但由于脉冲宽度很窄,在一定载噪比条件下,其测量精度仍可达厘米量级甚至更高。
The new system of pulse UWB measurement and control can effectively improve the safety performance of the monitoring and control system and has the potential of high-precision ranging capability. In order to realize its high-precision ranging function, a delay accurate tracking method based on delay locked loop is proposed. This method is improved on the basis of the traditional pseudo-code tracking loop, and the pulse phase of the received signal is precisely tracked by the non-linear feedback loop based on non-coherent integration. The theoretical analysis and simulation results show that the delay locked loop can finish the delay precision tracking of the pulse UWB measurement and control signal. Compared with DS signals, under the same conditions, the relative error of pulse UWB measurement and tracking signals is larger, but due to the narrow pulse width, the measurement accuracy is still up to centimeters under a certain carrier-to-noise ratio Level is even higher.