基于大型无人机航磁全轴梯度测量技术研究与应用

Research and application of aeromagnetic full axis gradient measurement technology based on large unmanned aerial vehicle

目前,我国航空物探在远海地区和青藏高原地区的工作程度并不高,这主要是由于我国现有有人机航空物探飞行平台的续航里程不够远或者无法在高海拔地区开展大比例尺、低高度飞行测量工作.由于彩虹4无人机的续航时间达到20余小时,飞行高度可达7300 m,经过项目研制,基于彩虹4无人机航磁全轴梯度测量系统突破了探测装置的集成设计、磁干扰特性的优化提升等一系列关键技术,首次实现了基于无人机的航磁总场、横向梯度、垂直梯度的一站式测量,航磁总场补偿后标准差优于±30 pT,横向梯度补偿后标准差优于±2 pT/m,垂向梯度补偿后标准差优于±6 pT/m,达到同类测量系统的国际领先水平,大大提升了我国在艰难地区和远海地区的勘查能力.

At present,the level of airborne geophysical exploration in China's high seas and Qinghai—Xizang Plateau regions is not high,mainly due to the insufficient range of existing manned aerial geophysical exploration flight platforms in China or the inability to carry out large-scale and low altitude flight measurement work in high-altitude areas.Due to the range of the Rainbow 4 drone reaching 4000 km and the flight altitude reaching 7300 m,after the development of a national key research and development project during the 13th Five Year Plan period,the Rainbow 4 drone's aeromagnetic full axis gradient measurement system has broken through a series of key technologies such as integrated design of detection devices and optimization and improvement of magnetic interference characteristics.It has achieved one-stop measurement of the total aeromagnetic field,horizontal gradient,and vertical gradient based on drones for the first time,After compensation by the aeromagnetic field,the standard deviation is better than±30 pT,the horizontal gradient dynamic fourth order difference is better than±2 pT/m,and the vertical gradient dynamic fourth order difference is better than±6 pT/m,reaching the international leading level of similar measurement systems,greatly improving China's exploration capabilities in difficult and distant areas.