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Marine magnetometer wave magnetic field noise real-time suppression method

A technology of magnetic field noise and magnetometer, applied in instruments, scientific instruments, re-radiation of sound waves, etc., can solve the problem of limited effect of wave magnetic field noise suppression, and achieve strong adaptability, high real-time performance, and prior information dependence. low effect

Inactive Publication Date: 2018-01-12
HARBIN ENG UNIV
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Problems solved by technology

In summary, the frequency domain filtering method has limited suppression effect on the wave magnetic field noise

Method used

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  • Marine magnetometer wave magnetic field noise real-time suppression method
  • Marine magnetometer wave magnetic field noise real-time suppression method
  • Marine magnetometer wave magnetic field noise real-time suppression method

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Experimental program
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Embodiment

[0097] In order to verify the rationality and feasibility of the present invention, the Matlab program is used to simulate the real-time suppression method of the ocean magnetometer wave magnetic field noise based on the improved Sage-Husa adaptive Kalman filter of design, and for realizing comparative analysis, the present invention The noise suppression effect of the method is compared with that of the LMS adaptive filter, a typical representative of the frequency domain filtering method.

[0098] Considering various situations comprehensively, taking a certain sea area in the East China Sea as an example, the initial conditions set are:

[0099] The total geomagnetic field F=47300nT, the wave period changes within 0.5s-1s, the wave amplitude ranges from 0m-1m, I=45°, σ=4.2S / m, θ=0°; assuming that there are 30 kinds of waves under this condition The superposition of simple harmonic motions of different frequencies and different amplitudes.

[0100] The wave magnetic field n...

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Abstract

The invention discloses a marine magnetometer wave magnetic field noise real-time suppression method, belonging to the field of marine geomagnetic field detection. The method comprises the following steps: step 1, starting a marine magnetometer, reading the output data of a marine geomagnetic sensor as an amount measurement; step 2, establishing a system state equation and a measurement equation;step 3, estimating the total geomagnetic field value at the moment of t_k by means of an improved Sage-Husa self-adaptive Kalman filter at the moment of t_(k-1), and updating and correcting the systemnoise array Q and meausrment noise array R; step 4 storing the data if t_k=M, wherein the operation time of the marine magnetometer is M, and completing the measurement work of the marine magnetometer; and returning the Q and R updating values if t_K<M, and returning to the step 3 to continue the estimation.. According to the method, the disturbance problem of high-precision marine magnetic fielddetection on the marine magnetometer by the wave magnetic field noise is solved, and the marine magnetometer can be ensured to have high detection precision even under the extreme sea condition.

Description

technical field [0001] The invention belongs to the field of ocean geomagnetic field detection, and in particular relates to a real-time suppression method for ocean wave magnetic field noise of an ocean magnetometer. Background technique [0002] The marine magnetometer is the main scientific instrument to realize the high-precision measurement of the marine geomagnetic field, and it has been widely used in the fields of marine resource development, marine military detection, and marine engineering survey. The magnetometer is towed by the ship for mobile measurement. It is more flexible to use and is not affected by the magnetic field of the carrier. It is one of the main methods of marine geomagnetic measurement. It has been observed that the peak-to-peak amplitude of the actual ocean wave magnetic noise can reach several nT, which will cause serious interference to the detection of high-precision ocean magnetometers. The usual method is to choose to measure when the sea ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/40G01V13/00
Inventor 钱华明柏明明钱林琛吴永慧赵迪
Owner HARBIN ENG UNIV
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