Space travelling wave tube group delay inhibition method based on helix internal diameter adjustment

Abstract

The invention belongs to the space travelling wave tube non-linear technology field and particularly relates to a space travelling wave tube group delay inhibition method based on helix internal diameter adjustment. According to the method, synchronization deviation of an electron beam and electromagnetic waves is controlled through adjusting an internal diameter Ra of a first interaction segment helix to make a relative phase angle of a first interaction segment to be about -50 DEG, so group delay is substantially inhibited at the cost of a little of output power, a fluctuation period is substantially reduced, and fluctuation amplitude is substantially reduced. The method is advantaged in that a synchronization degree of the electromagnetic waves and the electron beam is improved, a clustering state of the electron beam is further substantially improved, the group delay is remarkably inhibited after optimization, the fluctuation amplitude and the fluctuation period are substantially reduced, and the method is mainly applicable to space travelling wave tubes for communication.

Description

technical field [0001] The invention belongs to the field of nonlinear technology of space traveling wave tubes, in particular to a method for suppressing group time delay of space traveling wave tubes based on the adjustment of the inner diameter of a helix. Background technique [0002] Space-borne TWT is the final power amplifier widely used in satellite and spacecraft transponders, data transmission systems, radar and electronic countermeasure transmitters, etc. With the rapid development of my country's aerospace industry, there is a very urgent demand for the development and production of space traveling wave tube amplifiers. [0003] However, various nonlinear characteristics in the space traveling wave tube amplifier will directly affect the overall performance of satellites and spacecraft, among which the group delay affects the bit error rate of satellite communication, the time synchronization accuracy of the navigation system and the accuracy of pseudo ranging, w...

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Problems solved by technology

[0003] However, various nonlinear characteristics in the space traveling wave tube amplifier will directly affect the overall performance of satellites and spacecraft, among which the group delay affects the bit error rate of satellite communication, the time synchronization accuracy of the navigation system and the pseudo ranging accuracy, which is Because the traveling wave tube is a complex dispersion system, its nonlinear injection wave interaction process will produce a group delay phenomenon in which the phases of different frequency signals are inconsistent

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