摘要
对于已有机场或新建机场,均需要定期连续对磁偏角进行测量,以满足飞行磁航向和真方位的统一,并标定飞机上的磁罗经。针对当前常规地磁经纬仪测量磁偏角的方法,效率低、费用高,难以满足快速应急提供磁偏角需要的问题,本文分析了几种常见地磁场模型,以及地磁经纬仪测量磁偏角的原理和步骤,并通过实例数据分析和比较,得出结论:采用EMM模型计算的磁偏角,在三种地磁场模型中更加符合地面实地测量的结果,并可得到相当可观的精度,在前期论证或应急保障中可以快速满足相应的要求。此外,通过模型计算的结果也可以作为实测数据的一个验证,具有很好的应用前景。
For the existing airport or the new airport,it is necessary to measure the magnetic declination regularly and continuously to meet the unification of flight magnetic heading and true azimuth,and to calibrate the magnetic compass on the aircraft.In view of the low efficiency and high cost of the current conventional geomagnetic theodolite method to measure the magnetic declination,which is difficult to meet the needs of providing the magnetic declination quickly,this paper analyzes several common geomagnetic models,as well as the principle and steps of the geomagnetic theodolite to measure the magnetic declination,and through the analysis and comparison of the actual data,it comes to the conclusion that the magnetic declination calculated by EMM model,Among the three geomagnetic models,it is more consistent with the results of field measurement,and can obtain considerable accuracy,which can quickly meet the corresponding requirements in the early demonstration or emergency support;In addition,the results of the model calculation can also be used as a verification of the measured data,which has a good application prospect.
作者
戴中东
孟良
项伟
梁自忠
DAI Zhongdong;MENG Liang;XIANG Wei;LIANG Zizhong(Air Force Academy Engineering Design Institute,Beijing 100068,China;Beijing Institute of Special Engineering Design,Beijing 100028,China)
出处
《测绘通报》
CSCD
北大核心
2021年第S01期261-264,269,共5页
Bulletin of Surveying and Mapping
