最大值约束的广义延拓逼近GNSS码鉴相算法

发布时间：2018-03-25 21:01

本文选题：码鉴相器　切入点：延迟锁定环　出处：《系统工程与电子技术》2017年04期

【摘要】：针对GNSS码跟踪环高精度鉴相需求,提出了一种最大值约束的广义延拓逼近码鉴相算法,利用5个相关臂的相关结果建立广义延拓逼近模型,拟合得到相关值分布函数,进而得到码相位差。同时利用相关结果最大的相关节点对拟合的相关值分布函数进行约束,进一步提高了码相位差的估计精度和适应性。将新算法与常用的归一化超前减滞后包络鉴相算法从鉴相线性范围、牵引范围和鉴相误差三方面进行了对比。蒙特卡罗仿真和在GPS软件接收机上对实际GPS信号采样数据进行测试的结果表明,结合最大值约束的广义延拓逼近鉴相误差性能大大优于传统的归一化超前减滞后包络鉴相,可以有效地提升码鉴相器的鉴相精度。
[Abstract]:In order to meet the demand of high precision phase detection of GNSS code tracking ring, a generalized continuation approximation code phase discrimination algorithm with maximum constraint is proposed. The generalized continuation approximation model is established by using the correlation results of five correlated arms, and the correlation value distribution function is obtained by fitting. Then the code phase difference is obtained. At the same time, the distribution function of the fitted correlation value is constrained by the correlation node with the largest correlation result. The estimation accuracy and adaptability of code phase difference are further improved. The traction range and phase discrimination error are compared. The Monte Carlo simulation and the test results of the actual GPS signal sampling data on the GPS software receiver show that, The error performance of the generalized extension approximation with maximum constraint is much better than that of the traditional normalized preemptive and hysteretic envelope phase discriminator, which can effectively improve the phase detection accuracy of the code phase discriminator.
【作者单位】：中国科学院大学;中国科学院国家天文台;
【基金】：国家重点研发计划(2016YFB0501900) 国家自然科学基金(11404035)资助课题
【分类号】：TN967.1

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