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Adaptive SNR-based carrier phase multipath mitigation technique

机译：基于自适应SNR的载波相位多径缓解技术

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摘要

An improved technique that mitigates specular multipath in Global Positioning System (GPS) differential carrier phase measurements is described. It adaptively estimates the spectral parameters (frequency, amplitude, phase offset) of multipath in the associated signal-to-noise ratio (SNR), and then constructs a profile of the multipath error in the carrier phase. A multipath correction is subsequently made by subtracting the profile from the actual phase measurement data. The technique is demonstrated on ground based experimental data, as well as flight data from the atmospheric research satellite CRISTA-SPAS. Ground experiments were conducted on static platforms in severe multipath environments. Multipath was deliberately introduced by either strategic placement of reflectors or electronic injection. This allowed for some control over the strength and frequency of the multipath. Averaging the results from 43 ground and 18 flight data sets, the differential carrier phase multipath was reduced by 47%. The complete results for both ground and flight tests are presented and are accompanied by discussions of individual cases.
机译：描述了一种减轻全球定位系统（GPS）差分载波相位测量中的镜面多路径的改进技术。它以相关的信噪比（SNR）自适应估计多径的频谱参数（频率，幅度，相位偏移），然后构造载波相位中多径误差的曲线。随后通过从实际相位测量数据中减去轮廓来进行多径校正。这项技术在地面实验数据以及来自大气研究卫星CRISTA-SPAS的飞行数据中得到了证明。在严重的多路径环境中的静态平台上进行了地面实验。通过策略性放置反射器或电子注入故意引入多径。这允许对多径的强度和频率进行一些控制。将来自43个地面和18个飞行数据集的结果平均后，差分载波相位多径减少了47％。介绍了地面测试和飞行测试的完整结果，并附有个别案例的讨论。

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