Correction of atmosphere delay for geoscience laser altimeter system
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摘要: 为了对大气传播延迟误差进行修正,达到精确测量的目的,推导了天顶延迟的理论计算公式;在大仰角情况下提出了一种简化的映射函数,并把它与连分式映射函数进行了比较。以地球科学激光测高系统在南极的观测数据为依据,分析得到该系统的平均大气延迟量为2.35m,修正误差控制在12mm以内。结果表明,在大仰角情况下,两者对总延迟的影响差异不超过0.1mm。总的延迟量可以通过天顶延迟和映射函数计算得出。Abstract: Atmospheric propagation delay is one of the main error sources for geodetic measurement.Its correction is necessary for accurate measurements.Atmospheric delay depends on many atmosphere parameters,especially atmosphere density,pressure,temperature,etc.Atmosphere parameter distribution changes with elevation angles,and so does the atmospheric delay.The total delay can be calculated from the zenith delay.The theoretic formula of the zenith delay is deduced,and a simplified mapping function for large elevation angles is proposed and compared with Mendes' new continued fraction form.The difference is less than 0.1mm for the total delay.Lastely,the system's mean total delay and its error is solved on the basis of geoscience laser altimeter system(GLAS) observation data in Antarctica,the results are 2.35m and 12mm respectively.
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Keywords:
- atmospheric and ocean optics /
- atmospheric delay /
- mapping function /
- zenith delay
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