CAJ | 학술논문

针对卫星导航信道模拟器信号仿真中，传统伪距多普勒模拟方法瞬时控制精度差、滤波器资源占用较大的不足，提出了基于拉格朗日插值延迟滤波器及Farrow结构实现的伪距多普勒模拟方法。在分析信道模拟器系统架构的基础上，建立了多普勒模拟方法的模型，包括延时计算模块和可变延迟滤波器两部分。与多速率采样数字延迟滤波器方法比较，该方法滤波器系数个数约为后者的0．2％，并且改变时延特性时，仅需更新1个参数。信道模拟器实测数据结果表明使用该方法伪码多普勒模拟精度可以达到0．1 mHz。
침대위성도항신도모의기신호방진중，전통위거다보륵모의방법순시공제정도차、려파기자원점용교대적불족，제출료기우랍격랑일삽치연지려파기급Farrow결구실현적위거다보륵모의방법。재분석신도모의기계통가구적기출상，건립료다보륵모의방법적모형，포괄연시계산모괴화가변연지려파기량부분。여다속솔채양수자연지려파기방법비교，해방법려파기계수개수약위후자적0．2％，병차개변시연특성시，부수경신1개삼수。신도모의기실측수거결과표명사용해방법위마다보륵모의정도가이체도0．1 mHz。
In satellite navigation channel simulator,the traditional pseudo-range Doppler simulation method has some flaws,such as the low delay accuracy and the large filter resource.A new Doppler simulation method is proposed,using Lagrange interpolation variable fraction delay filter and Farrow structure.Based on analyzing the system architecture of channel simulator,the model of Doppler simulation was established,including the delay calculation module and variable delay filter.Compared with the multi-rate sampling digital delay filter method,the proposed method is just about 0.2% of the former filter resource,and the one parameter is just changed when the delay of filter is changed.Actual measured results with channel simulator indicate that the Doppler accuracy is 0.1 mHz.