航空重力弱信号提取的卡尔曼滤波方法研究

doi:10.11720/wtyht.2021.1439

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Abstract

Airborne gravimetry uses aircraft as a carrier to collect data of gravity field. Due to the influence of air flow, flight state and body vibration, the original data of airborne gravity measurement contain a large amount of noise, and the SNR is as high as the grade of several thousand to ten thousand. This becomes a technical problem for the development of airborne gravity measurement system to obtain the weak gravity signal from the original measurement data. In this paper, the general Kalman filter formula with certain control was adjusted for adaptability based on airborne gravity measurement system, the mathematical model of the airborne gravity anomaly was established, and the Kalman filter state equation was proposed for measuring principle of the system. Finally, the authors solved the problem of gravity signal and differential GNSS signals matching and airborne gravity of weak signal extraction. After the test of airborne gravity measurement data, the proposed airborne gravity data solution method can be used to solve airborne gravity anomalies with high accuracy, and the result is better than the FIR low-pass filter (currently used in engineering) solution results, which promotes the development of airborne gravity weak signal extraction technology.

Key words： airborne gravity anomaly Kalman filter gravity data solution method

Received: 08 September 2020 Published: 01 March 2021

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	Articles by authors
	Guan-Xin WANG
	Feng LUO
	Xi-Hua ZHOU
	Fang YAN

Cite this article:

Guan-Xin WANG,Feng LUO,Xi-Hua ZHOU, et al. Research on Kalman filter method for weak signal extraction of airborne gravity[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 76-83.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1439 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/76

Power spectrum analysis diagram of corrected gravity data

Power spectrum analysis diagram of differential GNSS height data

Comparison of vertical velocity (red line) and first derivative of height (blue line) calculated by differential GNSS

The internal accord accuracy of repeat lines of different filters for airborne gravity anomaly measured by the strapdown gravimeter

The internal accord accuracy of repeat lines of FIR100s filter for airborne gravity anomaly

The internal accord accuracy of repeat lines of Kalman filter for airborne gravity anomaly

The internal accord accuracy of repeat lines of different filters for airborne gravity anomaly measured by the platform gravimeter

The internal accord accuracy of repeat lines of FIR100s filter for airborne gravity anomaly (in steady-state flight condition)

The internal accord accuracy of repeat lines of Kalman filter for airborne gravity anomaly (in steady-state flight condition)

The internal accord accuracy of repeat lines of FIR100s filter for airborne gravity anomaly (in steady-state and maneuvering flight condition)

The internal accord accuracy of repeat lines of Kalman filter for airborne gravity anomaly (in steady-state and maneuvering flight condition)

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