Fast three-order intermodulation calculation method of traveling-wave tube

Abstract

The invention belongs to the technical field of non-linear distortion of traveling-wave tubes, particularly relates to a fast three-order intermodulation calculation method of a traveling-wave tube and is used for overcoming the defect that three-order intermodulation calculation of an existing traveling-wave tube is low. The method includes the steps that firstly, the center frequency of two input frequencies serves as input signal frequency, input power scanning is conducted, gain curve and phase shift curve data are obtained, and thereby complex gain curve data are obtained; then, the data are introduced into a calculation formula, rapid calculation is conducted, and output power of the two input frequencies and the three-order intermodulation output power are obtained under a specific field magnitude value; finally, the field magnitude value is scanned, and the fundamental wave output power under all input power and the three-order intermodulation output power can be obtained. According to the fast three-order intermodulation calculation method, power scanning needs to be conducted once under a single frequency, then, the three-order intermodulation under all input power can be fast solved through the formula, a one-dimension model only needs several seconds, and a three-dimension model only needs several minutes; three-order intermodulation optimization calculation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nonlinear distortion of traveling wave tubes, and in particular relates to a fast calculation method for third-order intermodulation of traveling wave tubes. Background technique [0002] Traveling wave tubes are broadband and high-power vacuum electronic devices, which are widely used in radar, communication, navigation and other fields. As the final amplifier of satellite communication, the space traveling wave tube plays an important role in signal amplification and transmission. The third-order intermodulation component of the space traveling wave tube is an important indicator that affects communication performance; due to nonlinear effects, the concurrency of multiple signals in the communication process will generate third-order intermodulation components, which will lead to mutual interference between multiple signals. It affects the accuracy of satellite communication and data transmission; in o...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fast calculation method for the third-order intermodulation of the existing traveling wave tube against the disadvantage of low calculation efficiency of the third-order intermodulation of the existing traveling wave tube. It only needs to scan the power once at a single frequency, and then use the formula to quickly solve the third-order intermodulation under different input powers. The one-dimensional model only takes tens of seconds, and the three-dimensional model only takes a few minutes.

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