CN107066642A

CN107066642A - A kind of suppressing method of the space travelling wave tube group delay adjusted based on supporting rod

Info

Publication number: CN107066642A
Application number: CN201611041981.XA
Authority: CN
Inventors: 胡玉禄; 邱海舰; 胡权; 朱小芳; 杨中海; 李斌
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2017-08-18
Anticipated expiration: 2036-11-24
Also published as: CN107066642B

Abstract

The invention belongs to space travelling wave tube nonlinear technology field, the suppressing method of specially a kind of space travelling wave tube group delay adjusted based on supporting rod.The present invention is the synchronism deviation that electronics note and electromagnetic wave are controlled by adjusting interaction first paragraph rectangle supporting rod width n, so that interaction first paragraph angle of transformation is at 50 degree or so, so to sacrifice a small amount of power output as cost, so that group delay is suppressed significantly, its period of waves greatly reduces, and fluctuating range is substantially reduced.The present invention on the premise of ensureing that power output meets user's index in whole frequency band range (>150W), group delay is significantly suppressed, and its fluctuating range and period of waves are obviously reduced, mainly for the space travelling wave tube for communication.

Description

A kind of suppressing method of the space travelling wave tube group delay adjusted based on supporting rod

Technical field

The invention belongs to space travelling wave tube nonlinear technology field, specially a kind of space traveling wave adjusted based on supporting rod The suppressing method of nest of tubes time delay.

Background technology

Space travelling wave tube (Space-borne TWT) is transponder, the data transfer for being widely used in satellite and spacecraft The final power amplifier of system, radar and ECM transmitter etc..With developing rapidly for China's aerospace industry, to space The development and production of travelling-wave tube amplifier propose very urgent demand.

But every nonlinear characteristic in space travelling wave tube amplifier can directly affect the globality of satellite and spacecraft Can, wherein group delay influence satellite communication the bit error rate, the timing tracking accuracy of navigation system and pseudo-ranging precision, this be because It is a complicated dispersion system for travelling-wave tubes, its nonlinear beam-wave interaction process can produce different frequency signals phase and differ The group delay phenomenon of cause.But in the prior art travelling-wave tubes group delay suppression research be still blank out, its mechanism of production and Suppressing method is urgent problem to be solved.Therefore it is highly desirable to study the suppressing method of group delay in travelling-wave tubes.Wherein group when The definition prolonged is：

Wherein, τ is group delay, and Φ is field phase, and f is frequency.

The content of the invention

There is problem or deficiency for above-mentioned, ensureing that power output is more than user's index in whole range of frequency bandwidths Under the premise of, the invention provides a kind of suppressing method of the space travelling wave tube group delay adjusted based on supporting rod.

The present invention proposes a kind of group delay Restrain measurement on the premise of ensureing that power meets user's index, specific as follows：

Step 1, with microwave tube simulation suit (MTSS) space travelling wave tube is emulated, draw its initial output work Rate and group delay；

Step 2, the rectangle supporting rod width n for being gradually reduced interaction first paragraph, every time with 0.001mm≤Δ n≤0.1mm Successively decrease, n is decremented to when interaction first paragraph angle of transformation is between [- 40deg, -60deg], and is meeting saturation output work When rate is more than 150W (user's index), the power obtained after each n successively decreases, interaction first paragraph angle of transformation and group are recorded Time delay；

Step 3, the point for picking out the group delay minimum that step 2 is recorded, finally record the output work under supporting rod width n Rate and group delay.

The rectangle supporting rod width n of helix TWT should carry out corresponding optimization design according to different frequency ranges, as long as Without departing from lowest power requirement and technological level.

The present invention on the premise of ensureing that power output meets user's index in whole frequency band range (>150W), utilize MTSS three-dimensional computations are emulated to supporting rod width n, by reducing supporting rod width n to change the phase velocity of dispersion curve and right Dispersion flattene degree is had little to no effect so that the phase velocity of electromagnetic wave and the speed of electronics are more nearly, and so just reduce electromagnetism The synchronism deviation (speed difference) that ripple is noted with electronics.When interaction first paragraph angle of transformation, (angle of transformation is field increase simultaneously Direction and the physical quantity of field direction angle, characterize the increased speed in field, can be obtained directly in MTSS softwares) [- 40deg, -60deg] when, electronics is noted by the relatively mild velocity modulation of electromagnetic wave and density modulation, will now form cybotactic state More preferably electronics is noted, and the nonlinear characteristic of electronics note also notes the electronics before optimizing significantly better than supporting rod width.By this Method improves the synchronization extent that electromagnetic wave is noted with electronics, and then substantially improves the cybotactic state of electronics note, group delay after optimization It is significantly suppressed, its fluctuating range and period of waves are obviously reduced.Present invention is generally directed to the space travelling wave tube for communication.

The present invention is to control electronics note synchronous with electromagnetic wave by adjusting interaction first paragraph rectangle supporting rod width n Deviation so that interaction first paragraph angle of transformation is in -50 degree left and right, so to sacrifice a small amount of power output as cost so that Group delay is suppressed significantly, and its period of waves greatly reduces, and fluctuating range is substantially reduced.

In summary, the present invention on the premise of ensureing that power output meets user's index in whole frequency band range (> 150W), group delay is significantly suppressed, and its fluctuating range and period of waves are obviously reduced.

Brief description of the drawings

Fig. 1 is no fin rectangle supporting rod high-frequency structure figure；

Fig. 2 is the interaction pitch distribution map that gradual change is born in positive transition；

Fig. 3 is power output with axle distribution map；

Fig. 4 is initial population time lag curve；

Fig. 5 is that n optimizations are front and rear, and angle of transformation is with axle distribution curve comparison diagram；

Fig. 6 is that rectangle supporting rod width n optimizations are front and rear, power scan distribution curve comparison diagram；

Fig. 7 is that rectangle supporting rod width n optimizations are front and rear, group delay scanning distribution curve comparison diagram.

Embodiment

Below so that frequency range is 11GHz-11.5GHz Ku wave band helix TWT as an example, to the technology of the present invention Scheme is described in further detail.

For 11GHz-11.5GHz Ku wave bands band helix TWT, group delay suppression is carried out to the space travelling wave tube Emulation, provides that the minimum output power in the whole frequency range of user's index request is more than 150W first.

Step 1, with MTSS three-dimensional computations, the space travelling wave tube is emulated, when drawing its initial power output and group Prolong；

As depicted in figs. 1 and 2, using Ku wave bands band helix TWT, its high-frequency structure is used without the clamping of fin rectangle Bar, interacting formations bear gradient pitch distribution using positive transition.The initial of the space travelling wave tube can be directly obtained in MTSS Power output and group delay, such as Fig. 3 and Fig. 4.Wherein initial group delay is 0.512ns.

Supporting rod width n, is specially reduced to 0.06mm by step 2, reduction supporting rod width (n) from 0.23mm.

Supporting rod width n is reduced to interaction first paragraph using the three-dimensional computations of MTSS softwares and is scanned optimization.With Δ n =0.01mm gradually reduces supporting rod width n, when finding interaction first paragraph supporting rod width n=0.06mm, interaction first The angle of transformation of section is -50 degree (see Fig. 5), in frequency band range minimum saturation output power be 158W (>150W user refers to Mark) (see Fig. 6).Reduce the influences of supporting rod width n not only to power output less, and group delay is dropped by 0.512ns It is 0.252ns to 0.26ns, i.e. group delay amount of suppression, 0 is reduced to by 7 the period of waves of group delay, group delay curve is near It is seemingly straightway (see Fig. 7).

In summary, the present embodiment is used by taking a 11GHz-11.5GHz helix TWT as an example ensureing that power is met On the premise of the index of family, group delay Restrain measurement is proposed, i.e., interaction first paragraph supporting rod width n is reduced to from 0.23mm 0.06mm.The present invention program can effectively suppress group delay distortion as can be seen here, and it is same that the average value of group delay is reduced When, the period of waves of group delay and fluctuating range also significantly reduce.But from examples it can be seen that for the spiral shell of different frequency range Spin line travelling-wave tubes, as long as on the premise of ensureing that user's index meets requirement, supporting rod width n specific size can be in this hair Obtained on the basis of bright scheme by optimization.

Claims

1. a kind of suppressing method of the space travelling wave tube group delay adjusted based on supporting rod, specific as follows：

Step 1, with microwave tube simulation suit MTSS space travelling wave tube is emulated, draw its initial power output and group Time delay；

Step 2, the rectangle supporting rod width n for being gradually reduced interaction first paragraph, are passed with 0.001mm≤Δ n≤0.1mm every time Subtract；N is decremented to when interaction first paragraph angle of transformation is between -40deg and -60deg, and is met saturation output power and be more than During 150W, the power obtained after each n successively decreases, interaction first paragraph angle of transformation and group delay are recorded；

Step 3, pick out the minimum point of the group delay of step 2 record, finally record power output under supporting rod width n and Group delay.

2. the suppressing method of the space travelling wave tube group delay adjusted as claimed in claim 1 based on supporting rod, it is characterised in that：Institute It is the space travelling wave tube for communication to state space travelling wave tube.

3. the suppressing method of the space travelling wave tube group delay adjusted as claimed in claim 2 based on supporting rod, it is characterised in that：Institute State the Ku waveband space travelling wave tubes for being 11GHz-11.5GHz for the space travelling wave tube of communication.