【作者】 孙东明；

【导师】 曾昭发； 鹿琪；

【作者基本信息】 吉林大学 ， 地球探测与信息技术， 2010， 硕士

【摘要】 针对吊舱式直升机频率域电磁数据处理技术中存在的不足,本文较为系统的研究了频率域航电数据从采集到处理的整个流程。具体研究内容主要分为吊舱式直升机频率域电磁系统、数据预处理和数据调平三个大的方面。对吊舱式直升机频率域电磁系统进行了系统的分析,主要包括系统装置及性能、航空电磁系统的工作原理、野外工作方式和监控数据质量的各项参数等内容。总结了灵敏度变化率、零点水平漂移、动态噪声水平、飞行高度统计和飞行偏航统计等监控参数。改进完善了场值归一化、噪声滤波、零漂的基线改正、相位校验及改正、坏点剔除和坐标变换等数据预处理技术。在噪声滤波中,在总结常用的一维递归滤波器、移动的平均滤波器和一维DDNL滤波器的基础上,引进了改进的中值滤波器,丰富了滤波技术。针对航电数据中存在的单一坐标点偏离航道过远和单一坐标点回转的坏点,提出了行之有效的解决算法。总结了主要的航电数据调平方法。在前人提出的低值段线性调平法、伪切割线调平法、条件滤波法、伪切割线半自动调平法、二维移动平均滤波自动调平法和基于线与线之间的调平方法的基础上,提出了用于频率域航空电磁数据处理的伪切割线自动调平法,丰富了航电调平方法,提高了针对“块状误差”调平方法的效率,减少了人为干扰。并将该方法应用于实际航电数据,验证了方法的可行性。更多还原

【Abstract】 Pod helicopter frequency domain electromagnetic data processing technology and its shortcomings, this paper systematically studies the frequency domain avionics data from collection to processing of the entire process. Specific studies are divided into bird helicopter frequency domain electromagnetic system, data preprocessing and data leveling the three major aspects.On bird helicopter frequency domain electromagnetic system analysis of the system, including system installation and performance, airborne electromagnetic system works, field work and monitoring the data quality parameters and so on. Summarizes the rate of change of sensitivity, zero level drift, dynamic noise levels, flight altitude and flight yaw statistics, statistical monitoring parameters.Refinement of the market value of normalization, noise filtering, zero drift of the baseline correction, phase calibration and correction, remove dead pixels, and coordinate transformation techniques such as data preprocessing. In the noise filter, used in summing up a one-dimensional recursive filters, moving average filter and the one-dimensional DDNL filter based on the introduction of the improved median filter, enriched filter technology. Navigation data for the existence of a single coordinate point deviated from the path too far, and a single point of rotation of the dead pixel coordinates proposed effective solution algorithm.Summarizes the major avionics data leveling method. In the previous section method proposed linear low leveling method, pseudo-cutting line leveling method, conditions of filtering, pseudo-semi-automatic cutting line leveling method, two-dimensional moving average filter based on automatic leveling method and between the lines The leveling method based on the proposed for frequency domain airborne electromagnetic data processing pseudo-cut line auto-leveling, increase leveling method of airborne electromagnetic, increase the targeted "massive error" method of leveling efficiency and decrease human disturbance. And the method is applied to the actual data of the airborne electromagnetic method, verify the feasibility of the method.更多还原