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A Method for Measuring Intermodulation Rejection of AM Radio Frequency Receiver

A technology of radio frequency receiver and measurement method, which is applied in the direction of receiver monitoring, etc., can solve the problems of lengthy operation steps and cumbersome experiment process, and achieve the effect of simplifying the experimental operation steps and simple and fast data processing method

Active Publication Date: 2019-01-01
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

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  • A Method for Measuring Intermodulation Rejection of AM Radio Frequency Receiver
  • A Method for Measuring Intermodulation Rejection of AM Radio Frequency Receiver
  • A Method for Measuring Intermodulation Rejection of AM Radio Frequency Receiver

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Embodiment Construction

[0043] Such as figure 2 As shown, the present invention provides a method for measuring the intermodulation rejection of an amplitude modulation radio frequency receiver. This method first inputs an amplitude modulation signal to the amplitude modulation radio frequency receiver, and adjusts the amplitude of the amplitude modulation signal to make the amplitude modulation radio frequency The receiver generates a standard response and extracts the signal characteristics such as amplitude and modulation degree of the AM input signal at this time; then directly obtains the nonlinear characteristic parameters of the AM RF receiver through the vector network analyzer a 1 And a 3 Itself or directly get a 1 And a 3 Ratio. Finally, the intermodulation suppression degree of the AM radio frequency receiver is obtained by constructing the relational expression of the intermodulation suppression degree of the AM radio frequency receiver and the above parameters. The specific implementation...

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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 radio frequency receivers, due to the particularity of the demodulation method of the received signal, in actual use, when signals from adjacent channels penetrate into the front end of the receiver, it is likely to cause unexpected cross-modulation response. . For this reason, in the electromagnetic compatibility test for AM radio frequency receivers, a cross-modulation rejection (referred to as cross-modulation rejection) test is introduced to measure the resistance of the AM radio frequency receiver to potential adjacent channel interference. [0003] The existing method for measuring the intermodulation suppression of radio frequency amplifiers is mainly CS105 in the national standard GJB151B-2013, but the e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/29
CPCH04B17/29
Inventor 戴飞高占威郑涛王凯
Owner BEIHANG UNIV
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