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Validate and improve ATMS geolocation accuracy by using lunar observations

机译：通过使用月球观测值验证并提高ATMS地理位置的准确性

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Recently, the advanced coastline inflection point method (CIPSD) was developed to retrieve the instrument boresight pointing error of Suomi National Polar-orbiting Partnership (SNPP) Advanced Technology Microwave Sounder (ATMS). Because of the use of mathematical model and separate-domain technique, this algorithm can retrieve the boresight pointing error in terms of Euler angles efficiently. But the retrieval uncertainty of yaw is larger than that of the other two angles due to the limitation in this method. This paper thoroughly investigates the phenomenon of asynchrony between the serial of space view counts and that of the simulated antenna response in lunar intrusion (LI) events. Sensitivity study shows that this asynchrony is mainly caused by the boresight pointing Euler angle yaw. A new retrieval algorithm for yaw is developed based on this relation. The yaw derived from the Lunar observations of space view 4 (SPV4) from 2011 to 2016 is 0.028° at K band, -0.012° at Ka band, -0.168° at V band, -0.005° at W band, and -0.054 at G band. This algorithm can serve as a supplement to CIPSD. The combined retrieval results, the roll and pitch from CIPSD and the yaw from lunar observations, are used to correct the ATMS SPV vectors when simulating the antenna response. The comparison between the corrected antenna response and the observed cold counts of ATMS channel 7 SPV4 at the LI event occurring on Jan 6-8, 2017 shows that, after correction, the simulated antenna response synchronizes very well with the actual observations.
机译：最近，开发了先进的海岸线拐点法（CIPSD）以检索Suomi国家极地轨道合作伙伴关系（SNPP）先进技术微波探空仪（ATMS）的仪器视轴指向误差。由于使用了数学模型和分离域技术，该算法可以有效地根据欧拉角检索视轴指向误差。但是由于该方法的局限性，偏航角的恢复不确定性大于其他两个角度。本文深入研究了一系列空间视图计数与月球侵入（LI）事件中模拟天线响应之间的异步现象。敏感性研究表明，这种异步性主要是由瞄准轴指向欧拉角偏航引起的。基于这种关系，开发了一种新的偏航检索算法。从2011年至2016年的月球太空观测4（SPV4）观测值得出的偏航在K波段为0.028°，在Ka波段为-0.012°，在V波段为-0.168°，在W波段为-0.005°，在-0.054 G乐队。该算法可以作为CIPSD的补充。在模拟天线响应时，将组合的检索结果（CIPSD的滚动和俯仰角以及月球观测的偏航）用于校正ATMS SPV向量。在2017年1月6日至8日发生的LI事件中，校正后的天线响应与ATMS信道7 SPV4的观测到的冷计数之间的比较表明，校正后，模拟的天线响应与实际观察结果非常同步。

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