Preprints
https://doi.org/10.5194/gi-2021-15
https://doi.org/10.5194/gi-2021-15

  01 Jul 2021

01 Jul 2021

Review status: this preprint is currently under review for the journal GI.

Analyze and improve the influence of geomagnetic gradient on aeromagnetic compensation in a towed bird

Zhijian Zhou1,2, Zhilong Liu1,2, Wenduo Li1,2, Yihang Wang1,2, and Chao Wang1,2 Zhijian Zhou et al.
  • 1Key Laboratory of Geo-exploration Instruments, Ministry of Education of China, Jilin University, Changchun 130026, China
  • 2College of Instrumentation and Electrical Engineering, Jilin University,Changchun 130026, China

Abstract. Aeromagnetic exploration is an important method of geophysical exploration. We study the compensation method of towed bird system and establish the towed bird interference model. Due to the low altitude of the helicopter, the geomagnetic gradient changes greatly, so the geomagnetic gradient is considered in the towed bird interference model. In this paper, we model the gradient of the geomagnetic field as vertical gradient and horizontal gradient components, analyze the influence of the towed bird system on the compensation results under different motion modes, and apply the ridge estimation method to solve the problem. We verify the feasibility of this compensation method through actual flight tests, and further improve the data quality of the towed bird interference.

Zhijian Zhou et al.

Status: open (until 14 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gi-2021-15', Anonymous Referee #1, 05 Jul 2021 reply
    • AC1: 'Reply on RC1', Chao Wang, 15 Jul 2021 reply
  • RC2: 'Comment on gi-2021-15', Anonymous Referee #2, 12 Jul 2021 reply
    • AC2: 'Reply on RC2', Chao Wang, 15 Jul 2021 reply

Zhijian Zhou et al.

Zhijian Zhou et al.

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Short summary
In this paper, we study the compensation method of the helicopter towed bird. We will affect the compensation results based on the geomagnetic gradient. Therefore, we build a compensation model based on the geomagnetic gradient, which is 6 % higher than the traditional model. When the helicopter towed bird system is used for magnetic target exploration, this method can be used to eliminate the interference generated by the helicopter towed bird system, and further accurately detect the target.