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Digital filtering system and method for long-time interference signals

An interference signal and digital filtering technology, applied in the field of interference processing, can solve the problems of high circuit complexity, difficulty in component selection, inability to interfere with filtering, etc., and achieve the effect of high filtering accuracy

Pending Publication Date: 2021-06-25
SHANGHAI AVIATION ELECTRIC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the large error and large drift of the capacitor, the simulation scheme has problems of inaccurate timing, large drift, difficulty in adjusting parameters, and high circuit complexity. Especially for long-term interference signals, the RC time constant must be set very large. Difficult selection, huge error, and serious delay to normal signals
In addition, when the duration of the interference signal is close to the duration of the effective signal, the analog solution can hardly filter the interference accurately, and the digital filter can solve the above problems

Method used

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  • Digital filtering system and method for long-time interference signals

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Embodiment Construction

[0015] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0016] See figure 1 , what is shown in the figure is the digital filtering system of the long-time interference signal. It includes a clock unit 1 , a synchronization unit 2 , a window sampling unit 3 , a window width setting unit 4 , a consistency judgment unit 5 and an output unit 6 . The synchronization unit 2, the window sampling unit 3, the consistency judging unit 5 and the output unit 6 are sequentially connected, and the clock unit 1 is respectively ...

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Abstract

The invention discloses a digital filtering system and method for a long-time interference signal, and the system comprises a clock unit, a synchronization unit, a window sampling unit, a window width setting unit, a consistency judgment unit and an output unit, wherein the synchronization unit, the window sampling unit, the consistency judgment unit and the output unit are sequentially connected; the clock unit is connected with the synchronization unit, the window sampling unit, the consistency judgment unit and the output unit. The invention has the beneficial effects that long-time continuous interference signals can be filtered, interference signals in specific duration can be filtered without influencing normal signals, the filtering accuracy is high, and the filtering time can be accurately adjusted.

Description

technical field [0001] The invention relates to interference processing during signal transmission between avionics equipment, in particular, a digital filter system and method for long-time interference signals. Background technique [0002] In the field of avionics, discrete switch signals are usually used for communication between avionics devices, and the signal format is generally "28V / open circuit" or "ground / open circuit", where "28V" or "ground" is an effective signal, and "open circuit" is invalid signal. When the signal is in the "open circuit" state, since the source end and the receiving end are both high impedance, the signal line is very easy to pick up electric field interference; and if the signal line is bundled with other wires to form a cable bundle, the inductive coupling between the lines makes the signal line easy to pick up. Induced interference voltage, when there is a signal with a large current change rate in the cable bundle (such as relay, contac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/02H03H17/0291
Inventor 段士龙郑昕李鹤龄
Owner SHANGHAI AVIATION ELECTRIC
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