GPS硬件延迟计算精度及其稳定性分析

Analyzing the precision and stability of GPS hardware delay

硬件延迟是利用GPS进行TEC测量时最大的误差源,其影响可达30多TECU。为获得更准确的绝对TEC数值,必须利用一定的电离层模型计算得出GPS系统硬件延迟。本文为估算利用一个时段内的观测数据计算得出的硬件延迟对后续时段TEC测量的影响,利用IGS网络中60多个数据质量良好的GPS跟踪站数据,对硬件延迟的精度和稳定性进行了研究。结果表明:GPS系统硬件延迟在短期内具有较好的精度和稳定性,但是当发生电离层扰动现象时GPS系统硬件延迟的精度和稳定性会遭到破坏。同时根据GPS系统硬件延迟稳定性的研究成果,本文还提出了一种对太阳耀斑进行预报的观点。

Hardware delay is the most significant error of GPS TEC measurement, which can be more 30 TECU. So GPS hardware delay must be calculated using a model of ionosphere to gain more precise TEC. In order to estimate the influence between different periods TEC measurement, the precision and stability of GPS hardware delay is studied based on more than 60 GPS tracking - station data in IGS net. The result shows that GPS hardware delay has better precision and stability in short time, hut ionosphere disturbance will destroy it. Meantime, a view of predicting solar flare based on the achievement of GPS hardware delay stability is proposed.