摘要
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0.1dB,相比数控衰减器,误差降低了80%.
In satellite navigation signal simulators,digital attenuators cannot reach a high accuracy of power control.Replacing digital attenuators by voltage variable attenuators,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 inputs 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,which decreases by 80%compared to digital attenuators.
出处
《全球定位系统》
CSCD
2016年第4期12-16,共5页
Gnss World of China
基金
青年科学基金资助项目(编号:61403413)
关键词
移动最小二乘法
压控衰减器
曲线拟合
精度改善
Moving least squares
voltage variable attenuator
curve fitting
accuracy improvement
