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A Digital Notch Filter Filtering Method for Reducing High Frequency Distortion

A notch filter, digital technology, applied in the direction of digital filter, digital technology network, filter, etc., can solve the problems of affecting the filtering effect and the distortion of the amplitude characteristic of the notch filter, so as to avoid the distortion of the amplitude characteristic , Solve the effect of weak filtering effect

Active Publication Date: 2019-02-12
SHANGHAI AEROSPACE CONTROL TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main defect of this design method is that in the process of converting the analog filter model into a digital filter model, since the center frequency of the notch filter is relatively close to the frequency calculated by the computer on the missile, the amplitude characteristics of the notch filter are in the There is distortion in the high frequency band, which affects the filtering effect

Method used

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  • A Digital Notch Filter Filtering Method for Reducing High Frequency Distortion
  • A Digital Notch Filter Filtering Method for Reducing High Frequency Distortion
  • A Digital Notch Filter Filtering Method for Reducing High Frequency Distortion

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Embodiment Construction

[0024] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, a digital notch filter filtering method for reducing high-frequency distortion includes the following steps:

[0026] S1. Determine the target center frequency of the notch filter.

[0027] The center frequency of the notch filter directly affects the calculation of the parameters of the digital notch filter. According to the amplitude attenuation requirements of the notch filter in the high frequency band, the parameters of the digital notch filter are selected.

[0028] S2. Establish a digital notch filter model according to the target center frequency of the notch filter.

[0029] The digital notch filter model is expressed as:

[0030]

[0031] a 1 =-2cos(2πf 1 T)

[0032] a 2 =-2cos(2πf 2 T)

[0033] In the formula, y represents the output of the notch filter, u ...

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Abstract

The invention discloses a digital notch filter filtering method enabling high-frequency distortion to be reduced. The method comprises the following steps: determining target center frequency of a notch filter; according to the target center frequency of the notch filter, constructing a digital notch filter model; and according to the digital notch filter model, determining a relation between input and output of the notch filter on a missile-borne computer to construct a digital notch filter. The digital notch filter model for convenience of the missile-borne computer is directly generated according to the center frequency of the notch filter, thus preventing amplitude feature distortion caused by a phenomenon that the center frequency of the notch filter approaches calculated frequency of the missile-borne computer and also ensuring that the filter has a certain amplitude attenuation effect within the high frequency band.

Description

technical field [0001] The invention relates to the technical field of notch filter filtering, in particular to a digital notch filter filtering method for reducing high-frequency distortion. [0002] The application field of the present invention is high-frequency noise suppression of tactical weapon autopilot, and it is characterized in that avoiding the distortion of the amplitude characteristic due to the center frequency of the notch wave filter being close to the calculation frequency of the computer on the bomb, improving the autopilot’s resistance to high-frequency noise inhibitory effect. Background technique [0003] High-frequency noise suppression is an important part of the design of tactical weapon autopilot, which can improve system stability, provide a good working environment for the sub-systems and stand-alone systems of the autopilot, and ensure reliable operation of the system. [0004] The sources of high-frequency noise of the autopilot are mainly the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
CPCH03H17/025H03H2222/00
Inventor 陈光山奚勇叶赛仙
Owner SHANGHAI AEROSPACE CONTROL TECH INST