A Compensation Method for Aircraft Aeromagnetic Interference
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A compensation method and interference compensation technology, applied in the field of aeromagnetic detection, can solve problems affecting the accuracy of estimation results, etc.
Active Publication Date: 2017-09-15
HARBIN INST OF TECH
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Since the estimation process of the compensation coefficient can be regarded as a linear regression, the nature of the coefficient solution matrix will inevitably affect the accuracy of the estimation result
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specific Embodiment approach 1
[0068] Specific embodiment 1. The method for compensating aircraft aeromagnetic interference described in this embodiment is carried out in the following steps:
[0069] 1. Construct the matrix Δ:
[0070] The magnetic field data measured by the total field magnetometer during the calibration flight is N×1 column vector H T , The actual geomagnetic field value is N×1 column vector H E , And the magnetic interference generated by the aircraft is N×1 column vector H I , Then:
[0071] H T =H E +H I (1)
[0072] Among them, only H T Obtained by direct measurement;
[0073] The ultimate goal of aeromagnetic interference compensation is to determine H E , It can be found by observing the above formula, as long as H I And change it from H T You can get H by subtracting it E ;
[0074] According to the T-L model, the magnetic interference generated by the aircraft can be expressed as:
[0075]
[0076] Where p i , A ij , B ij In order to need to estimate the aeromagnetic interference compensati...
specific Embodiment approach 2
[0104] The second embodiment is different from the first embodiment: the number of decomposed layers in step two is 9, that is, the value of j is 9. The other steps and parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0105] Specific embodiment three, this embodiment is different from specific embodiment one in that the number of decomposed layers in step two is 8, that is, the value of j is 8. The other steps and parameters are the same as in the first embodiment.
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Abstract
The invention provides a compensation method for airplane aeromagnetic interference, relates to the field of aeromagnetic detection, and aims at solving the problem that the estimation precision of the compensation coefficient is influenced by the morbid state of a present aeromagnetic interference coefficient calculation method. The method comprises the following steps that 1) a matrix delta is constructed; 2) the matrix delta is decomposed by wavelet; 3) bandbass filtering is carried out on a result of the step 2); 4) a subscript set L is determined so that the morbid state of bpf<L>(delta) is the weakest; and 5) a compensation coefficient equation is determined to solve the compensation coefficient of aeromagnetic interference. The method provided by the invention can effectively reduce the morbid state of the coefficient solution matrix, improve the solution precision of the compensation coefficient estimation algorithm, and can be applied to the field of aeromagnetic detection.
Description
Technical field [0001] The invention relates to the field of aeromagnetic detection, in particular to a compensation method for aircraft aeromagnetic interference. Background technique [0002] The aeromagnetic interference compensation technology is a technology to remove the magnetic interference of the aeronautical motion platform itself in the process of aeromagnetic detection. By analyzing the type and nature of the magnetic interference of the aviation movement platform, a mathematical model of the magnetic interference of the aviation movement platform is established, and then the total magnetic field and three-component data are measured according to the prescribed method during the calibration flight, and used to calculate the aviation movement The coefficients of the mathematical model of platform magnetic interference. In actual aeromagnetic detection, the estimated model coefficients and aircraft attitude data are used to estimate the magnetic interference generated ...
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