脉冲超宽带测控信号时延精密跟踪方法

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。

A timing tracking method for impulse radio UWB TT&C signal

The new impulse radio ultra-wideband(IR-UWB) tracking,telemetry and command(TT&C) system can effectively improve the security performance of the TT&C system,and has a potential high-precision range measuring capability. In order to realize the high-precision range measuring function,a precision timing tracking method based on delay-locked loop for IR-UWB TT&C signal is proposed. This method is improved on the basis of the traditional pseudo-code tracking loop and uses a non-linear feedback loop based on non-coherent integration to track the pulse phase of the received signal. Theoretical analysis and simulation results show that the delay-locked loop in this paper can complete the precision tracking of the IR-UWB TT&C signal. Compared with the direct sequence spread spectrum(DSSS) TT&C signal,the relative timing tracking error of IR-UWB TT&C signal is larger under the same conditions,but because of the quite narrow pulse width,its measuring precision can still reach centimeter level and even higher under certain carrier-to-noise ratio.