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A Fast Calculation Method of Third-Order Intermodulation in Traveling Wave Tube

A third-order intermodulation and fast calculation technology, which is applied in calculation, design optimization/simulation, system integration technology, etc., can solve the problems of low calculation efficiency of traveling wave tube third-order intermodulation and achieve the goal of improving calculation efficiency Effect

Active Publication Date: 2019-03-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • A Fast Calculation Method of Third-Order Intermodulation in Traveling Wave Tube
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  • A Fast Calculation Method of Third-Order Intermodulation in Traveling Wave Tube

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[0020] The present invention will be further described in detail below in conjunction with the model formula and the drawings.

[0021] The fast calculation method for the third-order intermodulation of a traveling wave tube in this embodiment includes the following steps:

[0022] Step 1: Use two input frequencies (f 1 ,f 2 ) The center frequency f 0 As the input signal frequency, take the small signal power with saturation input power back 20dB as the starting point, and take the saturated input power as the end point to scan the input power P to obtain the scanned gain curve G(P) and phase shift curve Ф(P), thus Obtain the complex gain curve under each input power:

[0023]

[0024] In this embodiment, suppose f 1 =1.5GHz, f 2 =1.5005GHz, then f 0 =1.50025GHz; and the saturated input power is 0.3mW (-5.2dBm), and the small signal power is 0.003mW (-25.2dBm) after backing 20dB, and the gain curve G(P) (such as figure 1 The middle curve 1) and the phase shift curve Ф(P) (as figure 1...

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Abstract

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, which is used to solve the disadvantage of low calculation efficiency of third-order intermodulation of existing traveling wave tubes. In this method, the center frequency of the two input frequencies is used as the input signal frequency to scan the input power to obtain the data of the gain curve and the phase shift curve, and then obtain the data of the complex gain curve; The output power of two input frequencies and the output power of the third-order intermodulation under the field amplitude; finally scan the field amplitude to obtain the fundamental output power and the output power of the third-order intermodulation under each input power. The invention only needs to scan the power once at a single frequency, and then uses the formula to quickly solve the third-order intermodulation power under each input power. The one-dimensional model only takes tens of seconds, and the three-dimensional model only takes a few minutes; greatly improving the third-order intermodulation Optimize computing efficiency.

Description

Technical field [0001] The invention belongs to the technical field of non-linear distortion of a traveling wave tube, and specifically relates to a fast calculation method for the third-order intermodulation of a traveling wave tube. Background technique [0002] Travelling wave tubes are vacuum electronic devices with wide frequency bands and high power, which are widely used in radar, communications, navigation and other fields. As the final amplifier of satellite communications, 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 non-linear effects, the concurrency of multiple signals in the communication process will generate third-order intermodulation components and cause mutual interference among multiple signals. It affects the accuracy of satellite communication and data transmiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02E40/70
Inventor 胡玉禄胡权朱小芳杨中海李斌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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