利用曲线拟合改善压控衰减器精度的方法

摘要

In satellite navigation signal simulators , digital attenuators cannot reach a high accuracy of power control .Replacing digital attenuators by voltage variable attenua‐tors ,a method for improving the accuracy of voltage variable attenuators with curve fitting based on moving least squares is proposed .By establishing the relationship between the in‐puts and outputs ,the accuracy of the voltage variable attenuator can be improved using the precise control word derived from expected attenuation .Experiment results demonstrate that the maximum error of attenuation is 0.1dB ,w hich decreases by 80% compared to digital at‐tenuators .%针对卫星导航信号模拟发生器中，数控衰减器无法满足功率控制的高精度需求的问题，采用压控衰减器代替，并提出基于移动最小二乘曲线拟合的压控衰减器精度改善方法。通过建立输入与输出的映射关系，根据期望衰减值得到精确的衰减控制字，进而提高压控衰减器的实际衰减精度。经实测数据验证，拟合的最大衰减误差为0畅1 dB ，相比数控衰减器，误差降低了80％。