CAJ | 학술논문

针对短延迟多径干扰影响下传统多径消除方法性能下降的问题，提出了一种跟踪环路鉴别器的构造方法．首先分析了短延迟多径下同相／正交超前、滞后与即时支路的输出特性，在此基础上构建出一种改进的超前支路；将环路鉴别器的输出定义为归一化超前减滞后功率型函数，从而使得直达信号码相位与本地估计码相位的误差小于预设门限值．理论分析和仿真结果表明，与传统多径抑制方法相比，基于改进环路鉴别器的多径抑制技术，能够减小相对时延小于0.5码片时多径带来的码跟踪误差，有效抑制了短延迟多径干扰，进而提高了导航与对接系统中的跟踪测量精度．
침대단연지다경간우영향하전통다경소제방법성능하강적문제，제출료일충근종배로감별기적구조방법．수선분석료단연지다경하동상／정교초전、체후여즉시지로적수출특성，재차기출상구건출일충개진적초전지로；장배로감별기적수출정의위귀일화초전감체후공솔형함수，종이사득직체신호마상위여본지고계마상위적오차소우예설문한치．이론분석화방진결과표명，여전통다경억제방법상비，기우개진배로감별기적다경억제기술，능구감소상대시연소우0.5마편시다경대래적마근종오차，유효억제료단연지다경간우，진이제고료도항여대접계통중적근종측량정도．
The traditional multipath eliminating methods have poor performance under short‐delay multipath interference and therefore a discriminator constructing method for tracking the loop is presented . Firstly , from the analysis of the output characteristics for in‐phase/quadrature‐phase early , late , and prompt channels under the short‐delay multipath , an improved late channel is constructed . The output of the loop discriminator is defined as the normalized function of the power difference between early and late signals . It made the error between the code phase of the direct signal and that of the local estimated signal is less than the pre‐determined threshold . Theoretical analysis and simulation results show that , compared to traditional methods , the multipath mitigation technique based on the improved loop discriminator can suppress the code tracking errors produced by the multipath when the relative delay is less than 0.5 chip and effectively inhibits short‐delay multipath interference , thus improving the tracking and measurement accuracy in navigation and docking systems .