Medium-high mountain area airborne gravity measurement three-dimensional route planning method

Abstract

The invention relates to a medium-high mountain area airborne gravity measurement three-dimensional route planning method. According to the requirement of an airborne gravity instrument on the flightfluctuation slope and fluctuation period, the measuring region terrain data is used as the basis; a control point is obtained in a mode of combining the calculation of a maximum value meeting a certain requirement and the calculation of an average value in the cross point of the measuring line and the cutting line; then, the control point is subjected to linear interpolation; the whole is liftedby a certain height to obtain a three-dimensional flight path curve. The average flight height is effectively reduced; the theoretical superposition of the measuring line and the cutting line cross point position height is ensured, so that the gravity field difference value on the cross point is enabled to be possibly small. Meanwhile, the output control point obtained through calculation can be provided for navigation equipment, so that the conventional visual navigation method is broken in the airborne gravity gentle fluctuation slope are enabled to meet the gravity measurement requirements;the problem of virtual gravity abnormality due to too great airplane pitching angle due to artificial factors can be solved.

Description

technical field [0001] The invention belongs to the technical field of aviation gravity exploration, and relates to a three-dimensional track planning method for aviation gravity measurement in middle and high mountainous areas. Background technique [0002] Aeronautical gravimetry is a geophysical method in which airborne gravimeters and other equipment are loaded on aircraft to measure the earth's gravitational field over the measurement area according to a preset flight path. Aviation gravity measurement track planning is usually based on level flight, and level flight aviation gravity measurement is adopted in middle and high mountainous areas (complex mountainous areas with an altitude difference greater than 500m and an altitude greater than 1000m), which leads to an increase in flight altitude and makes the gravimeter data collection The effective anomaly information obtained is greatly weakened, which reduces the accuracy of geological exploration. Zhou Xihua and ot...

AI Technical Summary

Problems solved by technology

Aviation gravity measurement track planning is usually based on level flight, and level flight aviation gravity measurement is adopted in middle and high mountainous areas (complex mountainous areas with an altitude difference greater than 500m and an altitude greater than 1000m), which leads to an increase in flight altitude and makes the gravimeter data collection The effective anomaly information obtained is greatly weakened, which reduces the accuracy of geological exploration

Zhou Xihua and others theoretically discussed the feasibility and effectiveness of aviation gravity undulating flight in "Research on the Application of Undulating Flight in Aeronautical Gravity Measurement" (Geophysical and Geochemical Exploration, 2015, 39: 98-104), but did not propose Three-dimensional trajectory planning method for flight

At present, aviation gravity fluctuation flight can only be carried out visually. Due to the lack of accurate three-dimensional trajectory planning, first, it is easy to cause the aircraft pitch angle to be too large, resulting in false gravity anomalies, which seriously interfere with the accuracy of the measurement results; second, It is impossible to guarantee that the flying heights at the intersection of the survey line and the cutting line coincide, which is not conducive to the leveling of the gravity field in the whole area

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