Passive intermodulation outlier quick locating method based on vector network analyzer

A technology of vector network analysis and passive intermodulation, which is applied in the field of rapid positioning of passive intermodulation abnormal points based on vector network analyzers, can solve problems such as loss of function, complex hardware composition, and influence of filter performance on measurement results. Achieve good adaptability, increase product added value, and improve accuracy

Inactive Publication Date: 2014-03-26
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0004] 1. It includes a reference receiving module, a synchronizer module, a main receiving module, a phase detector module and a control module, and the hardware structure is relatively complex; 2. The PIM signal is coupled to the front end of the instrument for phase calculation, and the filter of the PIM tester is not used
The high-power two-tone signal is bound to be coupled into the receiving module, so the built-in filter perform...

Method used

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  • Passive intermodulation outlier quick locating method based on vector network analyzer
  • Passive intermodulation outlier quick locating method based on vector network analyzer
  • Passive intermodulation outlier quick locating method based on vector network analyzer

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Embodiment 1

[0038] The general principle of passive intermodulation (PIM) test system composed of network analysis is: use one network analyzer as a signal source and receiver (spectrum analyzer), and use one signal source as another signal transmitting unit. The two test signals enter the power amplifier module respectively, and after being amplified, enter the test device for combination to form a 2x43dBm dual-tone signal, which is loaded on the device under test. The reflected PIM signal passes through the filter channel of the test device, and the filtered PIM interference enters the network analyzer for measurement, mainly measuring its amplitude or power. Therefore, the system includes 1 network analyzer, 1 signal source, 2 power amplifiers, 1 set of test equipment and accessories, or use 1 receiver, 1 signal source and 1 control computer to replace the network analyzer to form a measurement system, and The rapid location function of PIM interference abnormal points cannot be realiz...

Embodiment 2

[0059] On the basis of the above-described embodiments, the present invention is further described. A method for quickly locating passive intermodulation abnormal points based on a vector network analyzer of the present invention includes the following steps:

[0060] Step 1: The first signal source of the VNA generates the first signal and the second signal of the single-frequency signal of the test frequency, and the first signal enters the frequency multiplication unit through power division or coupling; the second signal passes through VNA port input to power amplifier;

[0061] Step 2: The second signal source of the VNA generates the third signal and the fourth signal of the single-frequency signal of the test frequency, and the third signal enters the frequency multiplication unit through power division or coupling; the fourth signal passes through VNA port input to power amplifier;

[0062] Step 3: The first signal and the third signal are mixed and filtered by the fr...

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Abstract

The invention provides a passive intermodulation outlier quick locating method based on a vector network analyzer. The vector network analyzer is used as two-path signal sources and a receiver (spectrum analyzer), two paths of testing signals enter a power amplifier module respectively, after amplification, a testing device is connected in to carry out combining, and 2 * 43dBm double-tone signals are formed and are loaded on a tested device. Reflection PIM signals pass through a filtering channel of the testing device, after filtering, PIM interference enters the network analyzer for measuring, and the amplitude and the phase are measured. According to the scheme, the quick locating function on a passive intermodulation outlier of the vector network analyzer can be achieved, the product added value of the current vector network analyzer is increased, locating can be carried out on an abnormal device according to a higher-order PIM product, and better adaptability is achieved on a system in which only a high-order PIM product falls into a receiving belt to form interference, such as a signal satellite communication system.

Description

technical field [0001] The invention belongs to the technical field of fast positioning of passive intermodulation abnormal points, and in particular relates to a method for fast positioning of passive intermodulation abnormal points based on a vector network analyzer. Background technique [0002] In the application of modern communication systems, with the increasing sensitivity of the receiver and the increasing transmission power, the requirements for the linearity of passive devices are also increasing, and the formation of passive intermodulation (PIM) products will affect the system. Interference becomes more prominent. At present, the main methods of system-level PIM detection and troubleshooting are tapping method and segmented elimination method, which are time-consuming and labor-intensive. The mainstream PIM tester manufacturers are developing the positioning function of the abnormal parts of the PIM tester. Although the implementation methods are different, the...

Claims

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Application Information

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IPC IPC(8): H04B1/10H04B17/00H04B17/345
Inventor 杨保国王尊峰梁胜利张庆龙马景芳李树彪李明太
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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