CN107026664B - A kind of method of cancellation receiver Intermodulation Interference - Google Patents

A kind of method of cancellation receiver Intermodulation Interference Download PDF

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CN107026664B
CN107026664B CN201710133078.4A CN201710133078A CN107026664B CN 107026664 B CN107026664 B CN 107026664B CN 201710133078 A CN201710133078 A CN 201710133078A CN 107026664 B CN107026664 B CN 107026664B
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frequency
local
local frequency
receiver
interference
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CN107026664A (en
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刘庆江
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Sichuan Hengtong Network Technology Co Ltd Hagrid
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Sichuan Hengtong Network Technology Co Ltd Hagrid
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B2001/1072—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal by tuning the receiver frequency

Abstract

The invention discloses a kind of methods of cancellation receiver Intermodulation Interference.It is the following steps are included: S1: receiving the signal frequency f that machine testing receivesR, according to preset first IF frequency fK1With the second IF frequency fK2Calculate the first local frequency fL1With the second local frequency fL2；S2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether that inter-modulated signal interference can be generated, if inter-modulated signal interference can be generated, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Δ f is reduced, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；S3: receiver uses final calculated first local frequency fL1With the second local frequency fL2.The present invention can be according to the second local frequency of signal frequency adjust automatically received, to eliminate Intermodulation Interference.

Description

A kind of method of cancellation receiver Intermodulation Interference
Technical field
The present invention relates to signal receiver technical field more particularly to a kind of methods of cancellation receiver Intermodulation Interference.
Background technique
FM receiver mostly uses double conversion technology, its advantage is that intermediate frequency amplification filtering, due to being fixed frequency, Index can be made fine.Raising of the Modern receivers with processing capacity and the requirements at the higher level to index, use in again and again Rate also improves.But the raising of intermediate frequency can bring the interference of the intermodulation of various frequencies, have an impact to the reception of receiver, sensitivity Index declines to a great extent.
Summary of the invention
The purpose of the present invention is the IF frequency for overcoming existing receiver to use is higher, it is easy to produce the technology of Intermodulation Interference Problem provides a kind of method of cancellation receiver Intermodulation Interference, can be according to the signal frequency adjust automatically received Two local frequencies, to eliminate Intermodulation Interference.
To solve the above-mentioned problems, the present invention is achieved by the following scheme:
A kind of method of cancellation receiver Intermodulation Interference of the invention, comprising the following steps:
S1: the signal frequency f that machine testing receives is receivedR, according to preset first IF frequency fK1With second in again and again Rate fK2Calculate the first local frequency fL1With the second local frequency fL2；
S2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether to generate mutually Signal interference is adjusted, if inter-modulated signal interference can be generated, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Δ f is reduced, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
S3: receiver uses final calculated first local frequency fL1With the second local frequency fL2。
In the technical scheme, receiver is previously provided with the first IF frequency fK1With the second IF frequency fK2Standard Value.When receiver receives signal, the frequency f of signal is detectedR, and according to preset first IF frequency fK1Standard value and Second IF frequency fK2Standard value calculates the first local frequency fL1With the second local frequency fL2。
Make the first local frequency f if there is N (N is positive integer)L1, the second local frequency fL2With the second IF frequency fK2Meet fL1±NfL2=fK2, then inter-modulated signal interference can be generated, receiver is by the second local frequency f at this timeL2Increase Δ f, makes Obtain the second IF frequency fK2Δ f is reduced, thus makes formula f there is no N (N is positive integer)L1±NfL2=fK2It sets up, thus Eliminate inter-modulated signal interference.Second IF frequency fK2After reducing Δ f, the processing software of receiver can be according to after change Two IF frequency fK2Software parameter is reconfigured.
Make formula f if there is no N (N is positive integer)L1±NfL2=fK2It sets up, then it is dry will not to generate inter-modulated signal It disturbs, the second local frequency fL2Constant, receiver uses the calculated first local frequency f of step S1L1With the second local frequency fL2。
Preferably, described judge whether the method that can generate inter-modulated signal interference the following steps are included: by the first local oscillator Frequency fL1, the second local frequency fL2With the second IF frequency fK2Substitute into formulaIf N is positive integer, Judgement can generate inter-modulated signal interference, and otherwise judgement will not generate inter-modulated signal interference.
Preferably, calculating first vibration frequency f in the step S1L1With the second local frequency fL2Method include with Lower step: the first local frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。
A kind of method of cancellation receiver Intermodulation Interference of the invention, comprising the following steps:
It precomputes receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With second Vibration frequency fL2, and store that data in receiver, when receiver receives some signal frequency fRWhen, find out correspondence The first local frequency fL1With the second local frequency fL2, and use first local frequency fL1With the second local frequency fL2；
It calculates receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With the second local oscillator frequency Rate fL2Method the following steps are included:
M1: according to signal frequency fRAnd preset first IF frequency fK1With the second IF frequency fK2Calculate first Vibration frequency fL1With the second local frequency fL2；
M2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether to generate mutually Signal interference is adjusted, if inter-modulated signal interference can be generated, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Δ f is reduced, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
M3: final calculated first local frequency fL1With the second local frequency fL2Signal frequency f is received for receiverR When the first local frequency f that need to useL1With the second local frequency fL2。
Preferably, described judge whether the method that can generate inter-modulated signal interference the following steps are included: by the first local oscillator Frequency fL1, the second local frequency fL2With the second IF frequency fK2Substitute into formulaIf N is positive integer, Judgement can generate inter-modulated signal interference, and otherwise judgement will not generate inter-modulated signal interference.
Preferably, calculating first vibration frequency f in the step M1L1With the second local frequency fL2Method include with Lower step: the first local frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。
The beneficial effects of the present invention are: can according to the second local frequency of signal frequency adjust automatically received, thus Eliminate Intermodulation Interference.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the invention；
Fig. 2 is a kind of structural schematic diagram of receiver.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1: a kind of method of cancellation receiver Intermodulation Interference of the present embodiment, as shown in Figure 1, including following step It is rapid:
S1: the signal frequency f that machine testing receives is receivedR, according to preset first IF frequency fK1With second in again and again Rate fK2Calculate the first local frequency fL1With the second local frequency fL2；
S2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether to generate mutually Signal interference is adjusted, if inter-modulated signal interference can be generated, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Δ f is reduced, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
S3: receiver uses final calculated first local frequency fL1With the second local frequency fL2。
Judge whether the method that can generate inter-modulated signal interference the following steps are included: by the first local frequency fL1, second Vibration frequency fL2With the second IF frequency fK2Substitute into formulaIf N is positive integer, judge that intermodulation can be generated Signal interference, otherwise judgement will not generate inter-modulated signal interference.
First vibration frequency f is calculated in step S1L1With the second local frequency fL2Method the following steps are included: first Vibration frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。
Receiver is previously provided with the first IF frequency fK1With the second IF frequency fK2Standard value.When receiver receives When to signal, the frequency f of signal is detectedR, and according to preset first IF frequency fK1Standard value and the second IF frequency fK2 Standard value calculates the first local frequency fL1With the second local frequency fL2。
Make the first local frequency f if there is N (N is positive integer)L1, the second local frequency fL2With the second IF frequency fK2Meet fL1±NfL2=fK2, then inter-modulated signal interference can be generated, receiver is by the second local frequency f at this timeL2Increase Δ f, makes Obtain the second IF frequency fK2Δ f is reduced, thus makes formula f there is no N (N is positive integer)L1±NfL2=fK2It sets up, thus Eliminate inter-modulated signal interference.Second IF frequency fK2After reducing Δ f, the processing software of receiver can be according to after change Two IF frequency fK2Software parameter is reconfigured, the second IF frequency f after change is usedK2Corresponding software parameter Configuration.Δ f is D1KHz, such as Δ f is 25KHz, 50KHz, 75KHz.
Make formula f if there is no N (N is positive integer)L1±NfL2=fK2It sets up, then it is dry will not to generate inter-modulated signal It disturbs, the second local frequency fL2Constant, receiver uses the calculated first local frequency f of step S1L1With the second local frequency fL2。
Such as: it is previously provided with the first IF frequency fK1Standard value 73.35MHz and the second IF frequency fK2Standard value 2.25MHz.When receiver receives the signal of 370MHz, the first local frequency f is calculated using step S1L1For 296.65MHz, the second local frequency fL2For 71.1MHz, formula is substituted intoN=4.14 is obtained, N is not positive whole Number will not generate inter-modulated signal interference, at this point, receiver uses the first IF frequency fK1=73.35MHz and the second IF frequency fK2=2.25MHz；When receiver receives the signal of 360MHz, the first local frequency f is calculated using step S1L1For 286.65MHz, the second local frequency fL2For 71.1MHz, formula is substituted intoN=4 is obtained, N is positive integer, meeting Inter-modulated signal interference is generated, receiver is by the second local frequency fL2Increase 25KHz, so that the second local frequency fL2Become 71.125MHz the second IF frequency fK2Become 2.225MHz, by fL1=286.65MHz, fK2=2.225MHz, fL2= 71.125MHz substituting into formulaN=3.9989 is obtained, N is not positive integer, and it is dry will not to generate inter-modulated signal It disturbs, at this point, receiver uses the first IF frequency fK1=73.35MHz and the second IF frequency fK2=2.225MHz.
A kind of structural schematic diagram of receiver, as shown in Fig. 2, receiver can be to the second local frequency fL2It is adjusted, the Two local frequency fL2After change, the second IF frequency fK2It can occur to change accordingly, at the digital filter and DSP of receiver The relevant parameter of reason device can be adjusted automatically.
A kind of embodiment 2: the method for cancellation receiver Intermodulation Interference of the present embodiment, comprising the following steps:
It precomputes receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With second Vibration frequency fL2, and store that data in receiver, when receiver receives some signal frequency fRWhen, find out correspondence The first local frequency fL1With the second local frequency fL2, and use first local frequency fL1With the second local frequency fL2；
It calculates receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With the second local oscillator frequency Rate fL2Method the following steps are included:
M1: according to signal frequency fRAnd preset first IF frequency fK1With the second IF frequency fK2Calculate first Vibration frequency fL1With the second local frequency fL2；
M2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether to generate mutually Signal interference is adjusted, if inter-modulated signal interference can be generated, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Δ f is reduced, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
M3: final calculated first local frequency fL1With the second local frequency fL2Signal frequency f is received for receiverR When the first local frequency f that need to useL1With the second local frequency fL2。
Judge whether the method that can generate inter-modulated signal interference the following steps are included: by the first local frequency fL1, second Vibration frequency fL2With the second IF frequency fK2Substitute into formulaIf N is positive integer, judge that intermodulation can be generated Signal interference, otherwise judgement will not generate inter-modulated signal interference.
First vibration frequency f is calculated in step M1L1With the second local frequency fL2Method the following steps are included: first Vibration frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。

Claims (2)

1. a kind of method of cancellation receiver Intermodulation Interference, which comprises the following steps:
S1: the signal frequency f that machine testing receives is receivedR, according to preset first IF frequency fK1With the second IF frequency fK2 Calculate the first local frequency fL1With the second local frequency fL2；
S2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether that intermodulation letter can be generated Number interference, if can generate inter-modulated signal interference, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Subtract Few Δ f, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
S3: receiver uses final calculated first local frequency fL1With the second local frequency fL2；It is described to judge whether to produce The method of raw inter-modulated signal interference is the following steps are included: by the first local frequency fL1, the second local frequency fL2With second in again and again Rate fK2Substitute into formulaIf N is positive integer, judges that inter-modulated signal interference can be generated, otherwise judge not Inter-modulated signal interference can be generated；
First vibration frequency f is calculated in the step S1L1With the second local frequency fL2Method the following steps are included: the first local oscillator Frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。
2. a kind of method of cancellation receiver Intermodulation Interference, which comprises the following steps:
It precomputes receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With the second local oscillator frequency Rate fL2, and store that data in receiver, when receiver receives some signal frequency fRWhen, find out corresponding One local frequency fL1With the second local frequency fL2, and use first local frequency fL1With the second local frequency fL2；
It calculates receiver and receives unlike signal frequency fRWhen the first local frequency f that need to useL1With the second local frequency fL2 Method the following steps are included:
M1: according to signal frequency fRAnd preset first IF frequency fK1With the second IF frequency fK2Calculate the first local oscillator frequency Rate fL1With the second local frequency fL2；
M2: according to the first local frequency fL1, the second local frequency fL2With the second IF frequency fK2Judge whether that intermodulation letter can be generated Number interference, if can generate inter-modulated signal interference, by the second local frequency fL2Increase Δ f, so that the second IF frequency fK2Subtract Few Δ f, if inter-modulated signal interference, the second local frequency f will not be generatedL2It is constant；
M3: final calculated first local frequency fL1With the second local frequency fL2Signal frequency f is received for receiverRWhen need The the first local frequency f usedL1With the second local frequency fL2；
It is described to judge whether the method that generate inter-modulated signal interference the following steps are included: by the first local frequency fL1, second Vibration frequency fL2With the second IF frequency fK2Substitute into formulaIf N is positive integer, judge that intermodulation can be generated Signal interference, otherwise judgement will not generate inter-modulated signal interference；
First vibration frequency f is calculated in the step M1L1With the second local frequency fL2Method the following steps are included: the first local oscillator Frequency fL1=fR-fK1, the second local frequency fL2=fK1-fK2。
CN201710133078.4A 2017-03-07 2017-03-07 A kind of method of cancellation receiver Intermodulation Interference Active CN107026664B (en)

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