Abstract
GPT2w模型是现有精度最高的天顶对流层模型，但是应用在高纬度地区时存在较大误差.为更好地保障卫星导航定位系统在高纬度地区的高精度应用，评定了GPT2w模型在高纬度地区的精度，获取天顶对流层湿延迟、干延迟和总延迟，探讨了GPT2w模型改正对精密单点定位的影响.试验结果表明： GPT2w模型在高纬度地区的精度为厘米级，优于其在中低纬度地区的精度；南北极地区天顶对流层呈现明显季节变化特征和区域一致性特征，夏季天顶对流层总延迟高于冬季，北极地区天顶对流层湿延迟明显高于南极地区，北极地区天顶对流层随季节的变化幅度大于南极地区.PPP试验结果表明，GPT2w模型能够有效改善定位精度，适应高纬度地区的高精度定位需求.
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