The Study Of Frequency Domain Airborne Electromagnetic Data Processing Methods

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.