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以MSIS90大气模式和3DNeUoG电离层模式为背景大气,仿真模拟了电离层暴、电离层行扰和电离层槽对GPS掩星弯曲角电离层残差及温度精度的影响。结果表明,在太阳活动活跃期,弯曲角电离层残差在35~50km高度范围内可达1.5μrad,其标准差可达0.9μrad;在15~35km高度范围内可达4μrad,其标准差可达1.4μrad。电离层暴和电离层槽可使弯曲角电离层残差标准差增大20多倍;电离层行扰可使弯曲角电离层残差标准差增大数倍。电离层干扰引起的电离层残差可使15~35km高度范围内温度反演误差高达8K,这样的温度误差会对掩星观测的日平均温度和月平均温度产生显著影响。因此,需要发展新的电离层修正方法;在掩星气候监测中,需加强电离层监测,并结合监测结果剔除电离层干扰误差。
The effects of ionospheric storms, ionospheric disturbances and ionospheric troughs on ionospheric residuals and temperature accuracies of GPS occultation cape were simulated using the MSIS90 atmospheric model and the 3DNeUoG ionosphere model. The results show that during the solar active period, the residual ionospheric residuals of the bending angle can reach 1.5μrad in the height range of 35-50km, and the standard deviation can reach 0.9μrad; and the standard deviation can reach 4μrad in the range of 15-35km Up to 1.4μrad. Ionospheric storms and ionospheric troughs can increase the standard deviation of the ionospheric residuals at bending angles by more than 20 times; ionospheric disturbances can increase the standard deviation of ionospheric residuals at bending angles by several fold. Ionospheric residuals caused by ionospheric interference can cause temperature inversion errors up to 8K in the range of 15-35km. Such temperature errors will have a significant impact on the daily mean temperature and monthly mean temperature of the occultation observations. Therefore, new ionospheric correction methods need to be developed. In the occultation climate monitoring, the ionospheric monitoring should be strengthened and the ionospheric interference errors should be eliminated in combination with the monitoring results.