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Frequency Calibration of A/D Converter in Software GPS Receivers

机译:GPS软件接收器中A / D转换器的频率校准

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摘要

This paper presents a software-based method to calibrate Analog-to-digital converter (ADC) sampling frequency in a software GPS receiver. Two front-end systems of a GPS software receiver were used in this study. The sampling frequencies of the ADC were found deviated from the nominal values provided by the manufacturers. Software algorithm was developed to calibrate the sampling frequencies. The algorithm is based on the initial-code-phase velocity and the carrier-phase velocity of the GPS signals at L1 frequency obtained by software receiver measurements. Allan variance analysis of this frequency characterization method is also included in this study.
机译:本文提出了一种基于软件的方法来校准软件GPS接收器中的模数转换器(ADC)采样频率。在这项研究中使用了GPS软件接收器的两个前端系统。发现ADC的采样频率与制造商提供的标称值存在偏差。开发了软件算法来校准采样频率。该算法基于通过软件接收器测量获得的L1频率的GPS信号的初始码相位速度和载波相位速度。本研究还包括这种频率表征方法的Allan方差分析。

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