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Residual passive intermodulation test method

A passive intermodulation and test method technology, applied in the field of satellite testing, can solve the problems of no mature method, complex mechanism, and no mention of passive intermodulation magnitude evaluation, so as to ensure authenticity, reduce Test error, reduce the effect of influence

Active Publication Date: 2016-08-24
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

[0005] First of all, these two PIM test methods are for passive intermodulation testing for a single device or system, and are mainly tested through wired cables, but neither mentions how to evaluate the site in a wireless test environment
[0006] Secondly, for the PIM measurement of the test site, especially the satellite test environment, there is no mature method for the evaluation of the residual passive intermodulation level
The mechanism of passive intermodulation is very complicated, and the passive intermodulation test may be affected by many factors. In addition to the PIM generated by the DUT itself, there may be PIM generated by the site exposed to the antenna radiation area

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Embodiment Construction

[0026] It should be understood that the main test steps of the remaining passive intermodulation test method in the satellite test environment of the present invention include: test system self-calibration, background scanning, radiation power density calibration, evaluation test, and stability measurement.

[0027] Among them, the self-calibration of the test system includes: after the test system is built, power calibration and system connectivity inspection, at the same time, use the PIM source to verify that the test system functions normally at the corresponding PIM frequency point.

[0028] The radiation power density calibration includes: the calculation of the radiation power density of the satellite, which needs to be combined with the test state of the satellite to obtain the maximum radiation power density at the location of the satellite, and then, according to the obtained maximum radiation power density, the radiation power density of the test system is calibrated ...

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Abstract

The present invention provides a residual passive intermodulation test method. The residual passive intermodulation test method comprises: performing self calibration of the system for testing so as to satisfy a presetting test requirement; scanning the background in a testing place so as to check and remove other interferences; performing calibration of the radiation power density of the system for testing according to the max radiation power density of the position where a satellite to be measured is located so as to allow the radiation power density of the system for testing to reach the level of the max radiation power density; and sampling and obtaining the max radiation power density of the satellite to be measured at different positions relative to the different positions in the testing field, and correspondingly obtaining different radiation power densities of the system for testing so as to obtain relatively stable radiation power density reading. According to the invention, an appropriate wireless test system is built and is calibrated so as to ensure that the passive intermodulation index of the satellite test environment reaches the requirement of the satellite passive intermodulation test, and therefore, the test result authenticity is ensured and the test error influence is decreased.

Description

technical field [0001] The invention belongs to the field of satellite testing, and relates to a residual passive intermodulation testing scheme in a satellite testing environment, and more specifically relates to a residual passive intermodulation testing method, which is suitable for evaluating and testing residual passive intermodulation in a satellite testing environment. Background technique [0002] The passive intermodulation (Passive Inter Modulation, hereinafter referred to as PIM) test is very difficult to measure due to its small test magnitude and its uncertainty. "Passive intermodulation measurement and solutions" in the ninth issue of "Telecommunications Technology" in 2007 mentioned that for ordinary microwave passive two-port devices, intermodulation products can be generated under the simultaneous action of two high-power signals. The usual measurement method can be tested by the measurement method of forward and reflected intermodulation products. [0003]...

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Application Information

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IPC IPC(8): H04B17/00G01R31/00
Inventor 李殷乔雷继兆孙治国陈明章蔡亚星张鸿鹏高新宇韩笑
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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