Measuring method for intermodulation sensitiveness of antenna terminal

Abstract

The invention discloses an antenna-terminal inter-modulation sensitivity measuring method which belongs to the measurement technical field. Based on an automatic testing system and according to the requirement to and method for the 15k-10GHz antenna-terminal inter-modulation transmission sensitivity test (CS103) in GJB152A-97, the method leads a signal source to generate a standard reference output level in a place of tuning frequency of an apparatus to be tested through defining an initial level of the signal source and regulates the frequency of a first signal source and computes frequency point arrays of a second signal source possibly generating inter-modulation interference and also regulates the amplitude of the second signal source to scan the frequency points. The method leads the automatic test system to quickly and accurately locate the inter-modulation frequency points so as to largely shorten test time. The automatic test system thoroughly utilizes the programmable capability of the apparatus and the computation of computers so as to simplify the work of testers and enhance the test efficiency.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method for measuring antenna terminal intermodulation sensitivity. Background technique [0002] With the increase of communications and other sub-devices on system platforms such as aircraft, the interference between antenna terminals has become an important factor affecting the electromagnetic compatibility between devices. Interference analysis between antenna terminals is more complicated, including receiver intermodulation, intermodulation, blocking, transmitter intermodulation, spurious emission, harmonic emission, etc. Among them, intermodulation interference is often unavoidable due to the nonlinearity of receivers and amplifiers and the difficulty of frequency planning, and has become the focus of people's research. [0003] In order to evaluate the ability of antenna terminals in military equipment and subsystems to suppress intermodulation interference, the "El...

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Problems solved by technology

[0005] This is relatively blind, and has two disadvantages: one is that the sweeping speed is relatively slow

The judgment of sensitive phenomena requires a certain reaction time for the equipment under test (EUT) and the test personnel, which makes it time-consuming when the frequency sweep range is large, and also increases a lot of operations; the second is for some narrow-band tuned EUTs, The selection of the step size should not be determined according to the limit value given in the military standard, because when the step size is too large, it may be difficult to find the frequency point that generates the intermodulation response, resulting in inaccurate test results

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