The Technology Of Passive Inter-Modulation Distortion Measurement And Locating Fault

With the rapid development of satellite and mobile communications technology, High power and multi-channel system constantly emerging, Passive inter-modulation distortion falls into the receiver frequency band, which will affect the performance of the receiver, and will cause paralysis of the communication system in serious cases, So the test study of passive inter- modulation distortion has more and more attention by engineers.This paper introduces the PIM distortion effect on communication system and its significance in the test, analysis the current research of PIM distortion measurement and fault location; Provides PIM distortion concept and mechanism, derives mathematical model of the PIM distortion; Elaborates the measurement principle of traditional PIM distortion, brings forward the PIM distortion measurement method based on vector network analyzer, Analyzes the technology basic principle of PIM distortion locating fault, structures of cable network fault reflex response model, builds the characterization model of PIM distortion locating fault based on time domain reflection and the reference signal, And introduces in detail design thought of PIM distortion locating fault method based on the reference signal.On the basis of the PIM distortion measurement and locating fault theory, Referring to engineering application and design requirements, The design, simulation and realization of inter- modulation reference module provide reference for inter-modulation signals, And this paper builds the PIM distortion measurement system based on vector network analyzer and the PIM distortion locating fault system based on reference signal; Gives reference module debugging results, tests the PIM distortion and locating fault, Test results and analysis show that the PIM distortion measurement based on vector network analyzer and locating fault system has great flexibility and effectiveness, can easily integrate with the vector network analyzer and other microwave millimeter wave test system, has a broad application value in the system In coaxial cable network, base station Antenna-Feeder system, indoor distribution system.