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Multipath Insensitive Delay Lock Loop in GNSS Receivers

机译:GNSS接收器中的多路径不敏感延迟锁定环路

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摘要

The code measurement suffers from multiple error sources and especially multipath. The latter is unpredictable and changes in space and over time. Many interesting multipath mitigation techniques have been proposed. Most of them are not sufficiently effective for precise positioning using the code measurement. This paper presents a multipath insensitive delay lock loop that aims to improve the pseudorange measurement precision in the presence of multipath. This code loop is simple and does not require postprocessing of observables. Simulation and real implementation results showed that the proposed code loop dramatically improves the tracking error due to multipaths. Tracking error is limited to 1 m on pseudorange in typical multipath environments. This loop is more sensitive than the standard delay lock loop to thermal noise and applies predominantly to strong GNSS signals.
机译:代码测量存在多个错误源,尤其是多路径。后者是不可预测的,并且会随着时间和空间而变化。已经提出了许多有趣的多径缓解技术。它们中的大多数对于使用代码测量进行精确定位而言都不足够有效。本文提出了一种多路径不敏感的延迟锁定环,其目的是在存在多路径的情况下提高伪距测量精度。此代码循环很简单,不需要对可观察对象进行后处理。仿真和实际实现结果表明,所提出的代码循环大大改善了由于多路径引起的跟踪误差。在典型的多径环境中,伪距上的跟踪误差限制为1 m。该环路比标准延迟锁定环路对热噪声更敏感,并且主要应用于强GNSS信号。

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