论文部分内容阅读
针对现有多径抑制方法在航天器间测距系统短时延多径场景下性能下降的问题,提出了一种基于改进码环鉴别器的多径抑制方法.通过对短时延多径情况下的超前、滞后和对准相关器进行分析,定义了一种改进的对准支路.所设计的鉴别器通过比较改进的对准支路相关值和滞后支路相关值,保证了当本地估计码相位与直达信号码相位同步时鉴别器输出为零,克服了传统鉴别器过零点偏移的缺陷.通过理论分析和仿真,证实改进的码环鉴别器的短时延多径抑制性能优于现有的多径抑制方法的,提高了航天器间测距场景下接收机的测距精度.
In order to reduce the performance of the existing multi-path mitigation method in the space-time ranging short-time multipath system, a multi-path mitigation method based on improved code ring discriminator is proposed. Under the lead, lag and alignment correlator analysis, defines an improved alignment branch.The designed discriminator by comparing the improved alignment branch correlation value and the value of the lagging branch to ensure that when the local When the estimated code phase and the direct signal code are in phase synchronization, the discriminator output is zero, which overcomes the defect of traditional discriminator zero-crossing offset.Through theoretical analysis and simulation, it is proved that the improved short-delay multipath rejection performance of the code ring discriminator In the existing multipath suppression method, the accuracy of ranging of a receiver in an inter-spacecraft ranging scenario is improved.