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Anti-intense arrow-band interference self-adaptive trap filter of spread-spectrum system and its method

A technology of adaptive notch filter and spread spectrum system, applied in transmission systems, electrical components, etc., can solve problems such as a large number of hardware resources, slow convergence speed, poor real-time performance, etc., and achieve high processing accuracy, slow convergence speed, and insertion loss. small effect

Inactive Publication Date: 2006-02-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] The deficiencies in the existing spread spectrum system adaptive anti-jamming notch technology: (1) using the adaptive algorithm, when the interference signal is enhanced and increased, the convergence of the LMS (Least Mean Square Algorithm, minimum mean square algorithm) algorithm Slow speed and poor real-time performance
(2) The number of interference suppression is adopted. In the analog circuit mode, the notch filter needs to correspond to the interference one by one, and a large amount of hardware resources are required when there are multiple interferences.

Method used

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  • Anti-intense arrow-band interference self-adaptive trap filter of spread-spectrum system and its method
  • Anti-intense arrow-band interference self-adaptive trap filter of spread-spectrum system and its method
  • Anti-intense arrow-band interference self-adaptive trap filter of spread-spectrum system and its method

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Embodiment

[0034] Such as figure 1 As shown, in the spread spectrum system, the signal is received by the broadband signal, multi-channel coupled, radio frequency processed, and multiplied by the local oscillator to obtain a 70MHz analog intermediate frequency signal, and then enters the adaptive notch wave of the spread spectrum system to resist strong narrowband interference The device performs real-time processing such as intermediate frequency anti-aliasing filtering, A / D conversion, digital down-conversion, and digital baseband processing on the input signal, and then outputs the signal.

[0035] figure 2 It is the appearance and structure of the anti-strong narrowband interference adaptive notch filter of this spread spectrum system, as shown in figure 2 As shown, after the power supply 1 is turned on, if the work is normal, the POWER indicator light will be on. The present invention is provided with two DC voltages, the red light 2 is 3.3V, and the green light 3 is 1.8V. The i...

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Abstract

The invention relates to an anti selective interference self-adapting trap for spread-spectrum system which comprises: anti mixing filter module, A / D converter module, digital down converter module (DDC), first in first out module (FIFO) and digital signal processor (DSP) connecting with each other in series; field programmable gate array (FPGA) separately connected with power supply, DDC, FIFO and DSP modules; crystal oscillator separately connected with A / D converter, DDC, DSP and FPGA; storage unit connected with DSP. The invention has the advantage of connecting with present devices, simple structure and high anti interference property.

Description

technical field [0001] The invention relates to an anti-jamming device of a spread spectrum system, in particular to an adaptive notch filter and a method thereof for resisting strong narrow-band interference of a spread spectrum system. Background technique [0002] When the spread spectrum system encounters strong narrowband interference, the spread spectrum system itself is powerless, so it is necessary to ensure that the receiving end of the system can still receive signals within the specified effect range under various harsh electromagnetic environments, so that the spread spectrum The system can operate normally and maintain stable anti-interference ability. [0003] At present, the domestic research and development of anti-interference adaptive notch technology and equipment for spread spectrum systems is still immature. Most of them focus on theoretical analysis research, and there are also some test boards made by simulation, but the actual e...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/10H04B1/71
Inventor 谢胜利李卫军傅予力
Owner SOUTH CHINA UNIV OF TECH
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