Self-adaptive adjustment method of aeromagnetic interference compensation coefficient
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A technology of self-adaptive adjustment and interference compensation, which can be used in electrical/magnetic exploration, re-radiation of sound waves, radio wave measurement systems, etc., and can solve problems such as inaccurate aeromagnetic interference compensation coefficients.
Active Publication Date: 2016-02-03
HARBIN INST OF TECH
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[0003] The present invention solves the problem that the aeromagnetic interference compensation coefficient is inaccurate due to the ill-conditionedn
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specific Embodiment approach 1
[0042] Specific implementation mode one: combine figure 1 To describe this embodiment,
[0043] An adaptive adjustment method for aeromagnetic interference compensation coefficient, comprising the following steps
[0044] Step 1. Obtain the magnetic interference H I with matrix Δ:
[0045] During the compensation flight, the total field magnetic field data measured by the total field magnetometer is H T , is an N×1 column vector; the geomagnetic field is H E , is an N×1 column vector; the magnetic interference generated by the aircraft is H I , is an N×1 column vector; the relationship between the three is:
[0046] h T =H E +H I (1)
[0047] The purpose of aeromagnetic compensation is through the measured H T to determine H E , by calculating H through the magnetic interference model I ;
[0048] The T-L model is currently a widely used magnetic interference model, which takes the magnetic interference H generated by the aircraft at a certain moment I Expressed ...
specific Embodiment approach 2
[0078] u described in step 1 of this embodiment i It is achieved through the following steps:
[0079] Measure the magnetic field magnitude v of the three axial components of the aircraft 1 , v 2 , v 3 , and then determine u according to formula (3) i
[0080] u i = v i v 1 2 + v 2 2 + v 3 2 - - - ( 3 )
[0081] Among them, i=1,2,3.
[0082] Other steps and parameters are the same as in the first embodiment.
specific Embodiment approach 3
[0083] K described in step 4 of this embodiment m The update formula for is:
[0084] K m = P m - 1 δ m T ( 1 + δ m P m - 1 δ m T ) - 1 - - - ( 9 )
[0085] in,(·) T means transpose, P m is the covariance matrix with a size of 16×16 dimensions.
[0086] Other steps and parameters are the same as in the first embodiment.
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Abstract
The invention discloses a self-adaptive adjustment method of an aeromagnetic interference compensation coefficient, relating to the aeromagnetic interference compensation technology field and particularly relating to a regulation method of the aeromagnetic interference compensation coefficient. The self-adaptive adjustment method of the aeromagnetic interference compensation coefficient is aimed to solve the problem that the in the prior art, the aeromagnetic interference compensation solving matrix is not accurate in the aeromagnetic interference compensation coefficient which is caused by morbidness. The self-adaptive adjustment method of the aeromagnetic interference compensation coefficient comprises steps of expressing the magnetic interference generated by an airplane as HI, performing extension on a T-L model, performing fusion on a geomagnetic field HE and a magnetic interference HI, setting an initial value Theta 0,P0, calculating a final compensation coefficient vector Theta 1 of first collection data according to a formula of Theta m=Theta m-1+Km (ym-Delta m Theta m-1), obtaining a final compensation coefficient vector Theta N until N times of collection data are finished, enabling the estimate value of a compensation coefficient vector to be Theta <^ >=Theta n, and using a Theta <^ > as a self-adaptive regulation result of the aeromagnetic interference compensation coefficient. The self-adaptive adjustment method of the aeromagnetic interference compensation coefficient is applicable to the adjustment of the magnetic interference compensation coefficient.
Description
technical field [0001] The invention relates to the technical field of aeromagnetic interference compensation, in particular to an adjustment method of an aeromagnetic interference compensation coefficient. 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 motion platform itself, a mathematical model of the magnetic interference of the aviation motion 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 are used to calculate the air motion Coefficients of the platform magnetic interference mathematical model. In the actual aeromagnetic detection, the estimated model coefficients and aircraft attitude data are used to ...
Claims
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