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Intermodulation distortion cancellation degree measuring method for amplitude modulation type radio frequency receiver

A technology of radio frequency receiver and measurement method, which is applied in the direction of receiver monitoring, etc., and can solve problems such as lengthy operation steps and cumbersome experiment process

Active Publication Date: 2016-12-07
BEIHANG UNIV
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Problems solved by technology

[0003] The existing measurement method of RF amplifier intermodulation rejection is mainly CS105 in the national standard GJB151B-2013, but the experimental process of this method is cumbersome and the operation steps are lengthy

Method used

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  • Intermodulation distortion cancellation degree measuring method for amplitude modulation type radio frequency receiver
  • Intermodulation distortion cancellation degree measuring method for amplitude modulation type radio frequency receiver
  • Intermodulation distortion cancellation degree measuring method for amplitude modulation type radio frequency receiver

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Embodiment Construction

[0043] Such as figure 2 As shown, the present invention provides a method for measuring intermodulation rejection of an AM radio frequency receiver. This method first inputs an AM signal to the AM radio frequency receiver, and adjusts the amplitude of the AM signal to make the AM radio frequency The receiver produces a standard response, and extracts the signal characteristics such as the amplitude and modulation degree of the AM input signal at this time; and then directly obtains the nonlinear characteristic parameter a of the AM RF receiver through the vector network analyzer 1 and a 3 itself or directly obtain a 1 and a 3 ratio. Finally, the calculation of the intermodulation rejection degree of the AM radio frequency receiver is completed by constructing the relationship expression between the intermodulation rejection degree of the amplitude modulation radio frequency receiver and the above parameters. The specific implementation steps are as follows:

[0044] Step...

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Abstract

The invention relates to an intermodulation distortion cancellation degree measuring method for an amplitude modulation type radio frequency receiver. The measuring method comprises the following steps: 1, generating a standard response on a tuning working frequency of the amplitude modulation type radio frequency receiver by using the amplitude modulation type radio frequency receiver, and extracting an input signal feature at the moment; 2, extracting a relationship between a non-linear feature coefficient a<1> and a non-linear feature coefficient a<3> of the amplitude modulation type radio frequency receiver by adopting a vector network analyzer; and 3, constructing a relationship expression formula between the intermodulation distortion cancellation degree of the amplitude modulation type radio frequency receiver and the a1 and the a3 in order to acquire the intermodulation distortion cancellation degree of the amplitude modulation type radio frequency receiver. Through adoption of the method, experimental measuring steps are simplified, and rapid measurement of the intermodulation distortion cancellation degree of the amplitude modulation type radio frequency receiver can be realized by means of a signal source, a vector network analyzer and a simple data processing operation. Compared with an intermodulation distortion cancellation degree measuring method provided by CS105 in GJB151B-2013, the measuring method has the advantages that the measuring complexity is lowered, and the measuring efficiency is increased.

Description

technical field [0001] The invention relates to a method for measuring the intermodulation suppression degree of an amplitude modulation type radio frequency receiver, which belongs to the field of electromagnetic compatibility testing. Background technique [0002] For AM RF receivers, due to the particularity of the demodulation method of the received signal, in actual use, when there is a signal from an adjacent channel infiltrating into the front end of the receiver, it is likely to cause an unexpected cross-modulation response . For this reason, in the EMC test for AM RF receivers, the test of cross-modulation suppression (referred to as cross-modulation suppression) is introduced to measure the resistance of AM RF receivers to potential adjacent channel interference. [0003] The existing measurement method of RF amplifier intermodulation rejection is mainly CS105 in the national standard GJB151B-2013, but the experimental process of this method is cumbersome and the ...

Claims

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Application Information

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IPC IPC(8): H04B17/29
CPCH04B17/29
Inventor 戴飞高占威郑涛王凯
Owner BEIHANG UNIV
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