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Method for eliminating intermodulation interference on receiver

An intermodulation interference and receiver technology, applied in the field of signal receiving equipment, can solve problems such as sensitivity index decline, receiver reception impact, intermodulation interference, etc., and achieve the effect of eliminating intermodulation interference

Active Publication Date: 2017-08-08
四川海格恒通专网科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of the intermediate frequency will bring the interference of intermodulation of various frequencies, which will affect the reception of the receiver, and the sensitivity index will drop significantly.

Method used

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  • Method for eliminating intermodulation interference on receiver
  • Method for eliminating intermodulation interference on receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A method for eliminating receiver intermodulation interference in this embodiment, such as figure 1 shown, including the following steps:

[0027] S1: The receiver detects the received signal frequency f R , according to the preset first intermediate frequency f K1 and the second IF frequency f K2 Calculate the first local oscillator frequency f L1 and the second local oscillator frequency f L2 ;

[0028] S2: According to the first local oscillator frequency f L1 , the second local oscillator frequency f L2 and the second IF frequency f K2 Judging whether intermodulation signal interference will occur, if intermodulation signal interference will occur, set the second local oscillator frequency f L2 Increase Δf such that the second IF frequency f K2 Reduce Δf, if there is no intermodulation signal interference, the second local oscillator frequency f L2 constant;

[0029] S3: The receiver uses the finally calculated first local oscillator frequen...

Embodiment 2

[0037] Embodiment 2: A method for eliminating receiver intermodulation interference in this embodiment includes the following steps:

[0038] Pre-calculate the frequency f of the different signals received by the receiver R The first local oscillator frequency f to be used when L1 and the second local oscillator frequency f L2 , and store these data in the receiver, when the receiver receives a certain signal frequency f R , find out the corresponding first local oscillator frequency f L1 and the second local oscillator frequency f L2 , and using the first LO frequency f L1 and the second local oscillator frequency f L2 ;

[0039] Calculate the frequency f of different signals received by the receiver R The first local oscillator frequency f to be used when L1 and the second local oscillator frequency f L2 The method includes the following steps:

[0040] M1: According to the signal frequency f R and the preset first IF frequency f K1 and the second IF frequency f ...

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Abstract

The invention discloses a method for eliminating intermodulation interference on a receiver. The method comprises the following steps: S1, the receiver detects a received signal frequency fR, and calculates a first local frequency fL1 and a second local frequency fL2 according to a preset first intermediate frequency fK1 and a preset second intermediate frequency fK2; S2, whether the intermodulation signal interference is to be produced or not is judged according to the first local frequency fL1, the second local frequency fL2 and the second intermediate frequency fK2; if the intermodulation signal interference is to be produced, the second local frequency fL2 is increased by delta f, so that the second intermediate frequency fK2 is decreased by the delta f; and if the intermodulation signal interference is not to be produced, the second local frequency fL2 remains unchanged; and S3, the receiver uses values of the first local frequency fL1 and the second local frequency fL2 that are finally calculated. The method provided by the invention has the advantages that the second local frequency can be automatically adjusted according to the received signal frequency, so that the intermodulation interference can be eliminated.

Description

technical field [0001] The invention relates to the technical field of signal receiving equipment, in particular to a method for eliminating receiver intermodulation interference. Background technique [0002] FM receivers mostly use secondary frequency conversion technology, which has the advantage of intermediate frequency amplification and filtering. Due to the fixed frequency, the indicators can be done very well. With the improvement of processing capability and higher requirements for indicators, modern receivers also increase the frequency of intermediate frequency used. However, the increase of the intermediate frequency will bring the interference of intermodulation of various frequencies, which will affect the reception of the receiver, and the sensitivity index will drop significantly. Contents of the invention [0003] The purpose of the present invention is to overcome the technical problem that the existing receiver uses high intermediate frequency and is pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B1/1027H04B2001/1072
Inventor 刘庆江
Owner 四川海格恒通专网科技有限公司