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Adaptive compensation method and system for environmental magnetic field suppression

An adaptive compensation and environmental magnetic field technology, applied in the field of signal detection, can solve problems such as adaptive instability and subtraction coefficient error

Active Publication Date: 2015-04-29
漫迪医疗仪器(上海)有限公司
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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an adaptive compensation method and system applied to environmental magnetic field suppression, which is used to solve the problem of using the method of setting the initial value and automatic convergence of the existing adaptive variable coefficient , leading to a large error in the subtraction coefficient in the initial period of time, and the problem of adaptive instability

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  • Adaptive compensation method and system for environmental magnetic field suppression
  • Adaptive compensation method and system for environmental magnetic field suppression
  • Adaptive compensation method and system for environmental magnetic field suppression

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Embodiment

[0037]This embodiment provides an adaptive compensation method applied to environmental magnetic field suppression, such as figure 1 As shown, the method includes:

[0038] Collecting a signal channel signal and a reference channel signal output by a detection system to obtain signal channel data and reference channel data. The detection system includes but is not limited to a biomagnetic detection system, and the biomagnetic detection system is provided with a signal channel and a reference channel. The signal channel signal and reference channel signal output by the detection system are usually analog signals, through A / D sampling, the analog signal channel signal and reference channel signal can be converted into digital signal channel data and reference channel data.

[0039] From the initial time point n using a window of length n 0 Start to extract the reference channel data, with the initial time point n 0 Starting from 0 and gradually increasing to N-n+1 with a grad...

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Abstract

The invention provides an adaptive compensation method and system for environmental magnetic field suppression. The method includes acquiring signal channel signals and reference channel signals output by a detection system to acquire the signal channel data and reference channel data; extracting the reference channel data from an initial time point through a window with the fixed length, increasing gradually according to the initial time point from 0 by adopting 1 as the gradient, and acquiring data of a plurality of compensation channels sequentially; establishing an error function containing a compensation coefficient, and acquiring the compensation coefficient by solving the error function according to the minimum variance criterion; performing environmental noise suppression on the signal channel data according to the compensation coefficient. Once a parameter of the length of the window is set, an initial value of a subtraction coefficient is omitted, the convergence process is avoided, the optimal subtraction coefficient can be acquired stably in an adaptive manner, and the gradient output with fine performance can be implemented.

Description

technical field [0001] The invention belongs to the technical field of signal detection, and relates to an environmental magnetic field suppression method, in particular to an adaptive compensation method and system applied to environmental magnetic field suppression. Background technique [0002] There is a wealth of electromagnetic information behind life activities. Biomagnetism is derived from the spatial magnetic field generated by bioelectrical activity, and its strength is very weak. For example, the typical strength of adult heart magnetism is only 100pT, and brain magnetism is even weaker, only on the order of hundreds of fT. Compared with biomagnetism, the environmental magnetic field is very strong. For example, the typical strength of the earth's magnetic field is 30-50μT, and the change of the urban environmental magnetic field has reached hundreds of nT. In order to detect weak biomagnetic signals in such a strong environmental magnetic field, in addition to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/02
CPCA61B5/7296A61B5/242
Inventor 张树林王永良孔祥燕谢晓明李华曾佳
Owner 漫迪医疗仪器(上海)有限公司
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