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为了衡量星上有效载荷核心器件的非理想特性对导航信号性能的影响,将相关损耗、鉴别器曲线过零点偏移和鉴别器曲线斜率失真作为评估指标,通过仿真评估了理想导航信号通过滤波器和高功放之后的信号质量,分析了信号的码跟踪精度和载波跟踪精度.仿真结果表明:同一滤波器对不同调制方式的信号有着不同的影响;高功放带来的过零点偏移的影响比滤波器小4个数量级,但是会带来明显的带外功率损耗.
In order to measure the influence of the non-ideal characteristics of on-board payload core device on the performance of navigation signals, the correlation loss, the zero-crossing of discriminator curve and the slope distortion of discriminator curve are taken as evaluation indexes. The simulation results show that the ideal navigation signal passes through the filter And signal quality after high power amplifier, the signal tracking accuracy and carrier tracking accuracy are analyzed.The simulation results show that: the same filter has different effects on the signals of different modulation modes; the influence ratio of zero-crossing offset caused by high power amplifier The filter is four orders of magnitude smaller, but with significant out-of-band power loss.