雾霾对GPS天顶对流层延迟与精密单点定位影响研究

Effects of Fog and Haze Weather on GPS Zenith Tropospheric Delay and Precise Point Positioning

通过计算对流层延迟和精密单点定位的点位坐标,研究雾霾天气对GPS天顶对流层延迟和精密单点定位精度的影响。结果表明,当空气质量持续良好、没有雾霾发生时,空气质量指数(air quality index,AQI)与对流层延迟的相关性很小;当重度雾霾天气持续发生时,雾霾会对天顶对流层延迟产生40~60mm的影响。但在精密单点定位中,通过对对流层延迟进行参数估计的方法可以消除绝大部分雾霾对定位精度的影响,因此无论重度雾霾天气是否发生,AQI指数与精密单点定位精度的相关性很小。

We calculate the value of the effects of fog and hazy weather on GPS zenith tropospheric delay and precise point positioning.Our results show that there is a weak correlation between AQI index and the tropospheric delay when the air quality is continuously good without fog and haze.The most severe fog and haze will affect the zenith tropospheric delay,with effect values from about 40-60 mm.However,in precise point positioning,most of positioning inaccuracy affected by haze can be eliminated by the method of tropospheric delay parameter estimation,in which there is a weak correlation between AQI index and the accuracy of precise point positioning,whether or not there is heavy fog and haze.