Method for suppressing amplitude modulation and phase modulation distortion of traveling wave tube

Abstract

The invention discloses a method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube. The method comprises the following steps: acquiring a distribution condition of a relative phase angle of an interaction distribution section of the traveling wave tube; obtaining the maximum value of the relative phase angle of the last section of the output section according to the distribution condition; and if the maximum value is within the preset range, optimizing the last section of the output section according to the screw pitch value corresponding to the maximum value so as to suppress amplitude modulation and phase modulation distortion of the traveling wave tube. According to the invention, the maximum value of the phase angle of the last section of the output section is obtained, and the last section of the output section is optimized according to the screw pitch value corresponding to the maximum value, so that the amplitude modulation and phase modulation distortion of the traveling wave tube is suppressed. According to the application, the last section of the output section is optimized through the screw pitch value corresponding to the maximum value in the preset range, and the synchronization state of the electron beam and the electromagnetic wave can be controlled, so that amplitude modulation and phase modulation distortion can be suppressed under the condition that the output power is kept basically unchanged and the interaction distribution length is not increased.

Description

Technical Field

[0001] The present application relates to the technical field of nonlinear traveling wave tubes, and in particular to a method for suppressing amplitude modulation and phase modulation distortion of traveling wave tubes. Background Art

[0002] Traveling wave tubes are a type of power amplifier that is widely used. They are the core components of electronic systems such as satellite communications, data transmission, and electronic countermeasures. With the rapid development of communication technology, higher and higher requirements are placed on the performance indicators of traveling wave tubes, and the development and production of high-performance traveling wave tubes is imminent.

[0003] As a typical nonlinear amplifier, the nonlinear working process of the traveling wave tube causes various nonlinear phenomena that will directly affect the overall performance of the communication system. Among them, the amplitude modulation and phase modulation distortion will produce parasitic spectral components, which will interfere with the transmitted signal within the working frequency band, thereby increasing the bit error rate of the system. The reason for the amplitude modulation and phase modulation distortion is that when the traveling wave tube works in the saturation region, the phase of the output signal is distorted as the input signal power increases. However, there are only a few studies on the suppression of amplitude modulation and phase modulation distortion in the prior art, and some of the only suppression methods require increasing the length of the traveling wave tube for power compensation, which is contrary to the development direction of miniaturization of the traveling wave tube. Therefore, it is very necessary to conduct further research on the method of suppressing the amplitude modulation and phase modulation distortion of the traveling wave tube. Summary of the invention

[0004] The purpose of the present application is to provide a method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube, so as to solve the technical problem that the existing traveling wave tube amplitude modulation and phase modulation distortion suppression requires power compensation by increasing the interaction distribution length. The preferred technical solutions among the many technical solutions provided in the present application can produce many technical effects as described below.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube, comprising: obtaining the distribution of relative phase angles of an interaction distribution segment of the traveling wave tube, the interaction distribution segment including the last segment of an output segment; obtaining the maximum value of the relative phase angle of the last segment of the output segment according to the distribution; if the maximum value is within a preset range, optimizing the output segment according to a pitch value corresponding to the maximum value to suppress the amplitude modulation and phase modulation distortion of the traveling wave tube.

[0007] In some embodiments, the method also includes: determining whether the maximum value is within the preset range; if the maximum value is greater than the maximum value of the preset range, adjusting the pitch value of the last section of the output section to change the maximum value, and when the maximum value falls within the preset range, optimizing the last section of the output section according to the current pitch value corresponding to the current maximum value within the preset range.

[0008] In some embodiments, adjusting the pitch value of the last segment of the output segment to change the maximum value includes: gradually increasing the pitch value according to a preset step size and recording the change of the maximum value.

[0009] In some embodiments, optimizing the last section of the output section according to the current pitch value corresponding to the current maximum value falling within the preset range includes: replacing the pitch value before adjustment with the current pitch value to achieve optimization of the last section of the output section.

[0010] In some embodiments, obtaining the maximum value of the relative phase angle of the last segment of the output segment based on the distribution condition includes: obtaining the distribution position of the last segment of the output segment in the interaction distribution segment based on the length value of the last segment of the output segment; and obtaining the maximum value of the relative phase angle of the last segment of the output segment based on the distribution position.

[0011] In some embodiments, the method further includes: performing simulation calculations on the traveling wave tube to obtain the distribution, the output power of the traveling wave tube, and the amplitude modulation and phase modulation distortion.

[0012] In some embodiments, the preset step size ranges from 0.001 mm to 0.01 mm; the preset range is from 0 degrees to 10 degrees; and the traveling wave tube is a C-band traveling wave tube of 3.6 GHz to 4.4 GHz.

[0013] A second aspect of the present application provides a computer program product, which is stored on a data carrier and is designed to execute the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube as described above.

[0014] A third aspect of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed, the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube as described above is implemented.

[0015] The fourth aspect of the present application provides a processing device, comprising: one or more processors; a memory for storing one or more computer programs, wherein the one or more processors are used to execute the one or more computer programs stored in the memory, so that the one or more processors execute the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube as described above.

[0016] Implementing one of the above technical solutions of the present application has the following advantages or beneficial effects: In the present application, by obtaining the maximum value of the phase angle of the last phase of the output segment of the interaction distribution segment, and optimizing the last phase of the output segment according to the pitch value corresponding to the maximum value, the amplitude modulation and phase modulation distortion of the traveling wave tube is suppressed. The present application optimizes the last phase of the output segment by the pitch value corresponding to the maximum value within the preset range, and can control the synchronization state of the electron beam and the electromagnetic wave, so that the amplitude modulation and phase modulation distortion can be suppressed while maintaining the output power basically unchanged and without increasing the interaction distribution length. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. It is obvious that the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 It is a flow chart of a method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of a high frequency structure of a rectangular clamping rod without winglets according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of the interaction distribution of an embodiment of the present application;

[0021] Figure 4 is a comparison diagram of the output power scanning distribution curves of the embodiment of the present application;

[0022] Figure 5 is a comparison diagram of the amplitude modulation and phase modulation distortion distribution curves of the embodiment of the present application;

[0023] Figure 6 is a distribution diagram of the relative phase angle of the interaction distribution according to the axial position of the embodiment of the present application;

[0024] Figure 7 It is a structural block diagram of the processing device of an embodiment of the present application.

[0025] In the figure: 1. processing device; 10. memory; 11. processor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the present application are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, and devices that are consistent with some aspects disclosed in the present application as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] In order to illustrate the technical solution described in the present application, a specific embodiment is provided below, and only the parts related to the embodiment of the present application are shown.

[0029] like Figure 1 As shown, the present application provides a method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube, comprising the following steps (step S1 to step S3):

[0030] S1. Obtain the distribution of the relative phase angle of the interaction distribution section of the traveling wave tube.

[0031] In some embodiments, the interaction distribution segment may include the last segment of the output segment.

[0032] In some embodiments, the method for suppressing the amplitude modulation and phase modulation distortion of the traveling wave tube may further include: performing simulation calculations on the traveling wave tube to obtain distribution conditions, output power of the traveling wave tube, and amplitude modulation and phase modulation distortion conditions.

[0033] In some embodiments, the traveling wave tube may be a C-band traveling wave tube of 3.6 GHz to 4.4 GHz. The traveling wave tube may be a helical traveling wave tube. The interaction distribution section may include an input section and an output section. The output section may be divided into three sections, the first section of the output section is a constant section, the second section of the output section is a gradual section, and the last section of the output section is a constant section. The above sections may be connected in sequence.

[0034] It is understandable that the embodiments of the present application can also be applied to traveling wave tubes of other different frequency bands. For the convenience of description, the embodiments of the present application are described below using a C-band traveling wave tube with an operating frequency band of 3.6 GHz to 4.4 GHz as an example.

[0035] In some embodiments, Figure 2 As shown, the traveling wave tube can use a rectangular clamping rod without fins. The high-frequency circuit of the traveling wave tube can be solved to obtain the high-frequency characteristics of the traveling wave tube.

[0036] In some embodiments, Figure 3 As shown, the total length of the interaction distribution section of the traveling wave tube can be 119 mm, wherein the length of the last section of the output section of the interaction distribution section can be 4 mm. It should be noted that the embodiment of the present application does not limit the specific size of the traveling wave tube, that is, the interaction distribution section of the traveling wave tube can also be of other lengths.

[0037] In some embodiments, Figure 3 The black areas in the figure can represent attenuators in the traveling wave tube design, where the first black area can be the input attenuator and the second black area can be the output attenuator; the blank area between the black areas can represent the cut-off part in the traveling wave tube design. Figure 3 As shown, the initial position of the input attenuator can be 47 mm of the interaction distribution section, and the length of the input attenuator can be 10 mm; the initial position of the output attenuator can be 59 mm of the interaction distribution section, and the length of the output attenuator can be 12 mm.

[0038] In some embodiments, the Figure 3 The interaction distribution diagram shown in the figure is used to simulate the traveling wave tube. The simulation calculation can be realized based on the three-dimensional calculation capability of the simulation software, such as MTSS software.

[0039] In some embodiments, Figure 4 and Figure 5As shown, the output power of the traveling wave tube is greater than or equal to 130W (watts), and the amplitude modulation and phase modulation distortion of the traveling wave tube is 3.21deg / dB (degrees / decibel).

[0040] S2. According to the distribution, the maximum value of the relative phase angle of the last segment of the output segment is obtained.

[0041] In some embodiments, obtaining the maximum value of the relative phase angle of the last segment of the output segment based on the distribution situation may include: obtaining the distribution position of the last segment of the output segment in the interaction distribution segment based on the length value of the last segment of the output segment; and obtaining the maximum value of the relative phase angle of the last segment of the output segment based on the distribution position.

[0042] In some embodiments, Figure 6 As shown, the length of the last segment of the output segment of the interaction distribution segment is 4 mm, and the distribution position of the last segment of the output segment in the interaction distribution segment can be 115 mm to 119 mm of the interaction distribution segment. That is, the maximum value of the relative phase angle within the range of 115 mm to 119 mm of the interaction distribution segment can be obtained. Figure 6 As shown, the maximum value of the relative phase angle of the last segment of the output segment can be 32.04 degrees.

[0043] In the multi-segment interaction distribution, the head of the interaction distribution segment, that is, the input segment distribution, can be used to establish a growing wave, when the traveling wave tube is still in a small signal state. The last segment of the output segment of the interaction distribution segment is used to transfer the energy of the electron beam to the electromagnetic field, when the power output of the traveling wave tube reaches saturation. AM and PM distortion is a distortion phenomenon generated when the traveling wave tube works in the saturation region, which means that in the multi-segment interaction distribution, the most significant influence on this phenomenon should be the last segment distribution range of the output segment.

[0044] S3. If the maximum value is within a preset range, the last section of the output section is optimized according to the pitch value corresponding to the maximum value to suppress the amplitude modulation and phase modulation distortion of the traveling wave tube.

[0045] In some embodiments, simulation software may be used to scan and optimize the pitch value of the last segment of the output segment of the interaction distribution segment. The pitch value of the last segment of the output segment of the interaction distribution segment may be 0.5 mm.

[0046] In some embodiments, the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube may further include: determining whether the maximum value is within a preset range; if the maximum value is greater than the maximum value of the preset range, adjusting the pitch value of the last section of the output section to change the maximum value; when the maximum value falls within the preset range, optimizing the last section of the output section according to the current pitch value corresponding to the current maximum value within the preset range.

[0047] In some embodiments, adjusting the pitch value of the last segment of the output segment may refer to increasing or decreasing the pitch value of the last segment of the output segment. As the pitch value is adjusted, the maximum value of the relative phase angle of the last segment of the output segment will also change.

[0048] In some embodiments, the preset range may be 0 to 10 degrees. In some embodiments, the pitch value of the last segment of the output segment may be adjusted multiple times to obtain the maximum value of the relative phase angle of the last segment of multiple output segments. The current pitch value of the last segment of the output segment when the maximum value falls into the preset range for the first time may be obtained.

[0049] In some embodiments, optimizing the last section of the output section according to the current pitch value corresponding to the current maximum value falling within the preset range may include: replacing the pitch value before adjustment with the current pitch value to achieve optimization of the last section of the output section. For example, if the pitch value before adjustment is A, the maximum value does not fall within the preset range; then, by adjusting the pitch value to B, that is, the current pitch value is B, if the current maximum value falls within the preset range, the pitch value B can be used to replace the pitch value A to achieve optimization of the last section of the output section.

[0050] In some embodiments, adjusting the pitch value of the last segment of the output segment so that the maximum value changes may include: gradually increasing the pitch value according to a preset step length and recording the change of the maximum value. In some embodiments, the pitch value of the last segment of the output segment may be increased according to an arithmetic progression according to a preset step length to obtain the maximum value corresponding to the multiple pitch values ​​increased according to the arithmetic progression.

[0051] In some embodiments, the preset step size may range from 0.001 mm to 0.01 mm. For example, when the preset step size is 0.01 mm and the pitch value before adjustment is 0.5 mm, the maximum value of the relative phase angle of the last segment of the output segment when the pitch value is 0.51 mm can be obtained; then, it is determined whether the maximum value falls within the preset range. If it does not fall within the preset range, the maximum value of the relative phase angle of the last segment of the output segment when the pitch value is 0.52 mm is continued to be obtained until the maximum value falls within the preset range.

[0052] In some embodiments, when the pitch value increases to 0.54 mm, the maximum value of the relative phase angle in the last section of the output section is 8.95 degrees. At this time, it can be considered that the maximum value of the relative phase angle in the last section of the output section falls within the preset range, and the current pitch value, that is, 0.54 mm, can be recorded; then, the pitch value of the last section of the output section of the interaction distribution section can be optimized to 0.54 mm to suppress the amplitude modulation and phase modulation distortion of the traveling wave tube.

[0053] In some embodiments, the preset step length can be adjusted during the process of adjusting the pitch value. For example, for the last segment of the output segment with a pitch value of 0.5 mm, the preset step length can be set to 0.03, and the pitch value can be adjusted to 0.53 mm; then, in the next adjustment, the preset step length can be adjusted to 0.01, and the pitch value can be adjusted to 0.54 mm. In this way, the optimization steps can be reduced and the convenience can be improved.

[0054] pass Figure 4 , Figure 5 as well as Figure 6 It can be seen that the output power at the low frequency end of the embodiment of the present application is reduced, and the output power at the high frequency end is increased. On the basis of maintaining the output power above 130W, the embodiment of the present application reduces the AM / PM distortion from 3.21deg / dB to 2.57deg / dB, which is reduced by 0.64deg / dB, and the reduction is about 19.9%. Therefore, the embodiment of the present application can produce a significant effect on the suppression of AM / PM distortion.

[0055] In the present application, the maximum value of the phase angle of the last phase of the output segment of the interaction distribution segment is obtained, and the last phase of the output segment is optimized according to the pitch value corresponding to the maximum value, so as to suppress the amplitude modulation and phase modulation distortion of the traveling wave tube. The present application optimizes the last phase of the output segment by the pitch value corresponding to the maximum value within the preset range, and can control the synchronization state of the electron beam and the electromagnetic wave, so as to suppress the amplitude modulation and phase modulation distortion while maintaining the output power basically unchanged and without increasing the interaction distribution length.

[0056] The present application also provides a computer program product, which is stored on a data carrier and is designed to execute the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube as described above. Therefore, the computer program product according to the present application produces the same advantages as those described in detail with reference to the device according to the present application. The computer program product can be executed as a computer-readable instruction code in any appropriate programming language such as JAVA, C++, etc. In addition, the computer program product can be provided on a network, such as the Internet, or a network, such as an Internet user, can download the computer program product from the network, such as the Internet when needed. The computer program product can be implemented by means of a computer program, i.e., software, or by means of one or more dedicated electronic circuits, i.e., hardware, or in any mixed form, i.e., by means of software components and hardware components, or in the form of software, hardware, or a mixture of software and hardware.

[0057] Those skilled in the art can understand that all or part of the features / steps of the above-mentioned method embodiments can be implemented by methods, data processing systems or computer programs, and these features can be implemented without hardware, entirely by software, or by a combination of hardware and software. The aforementioned computer program can be stored in one or more computer-readable storage media, and the storage medium stores the computer program. When the computer program is executed (such as by a processor), the steps of the above-mentioned method embodiment for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube are executed.

[0058] The aforementioned storage media that can store program codes include: static hard disks, solid-state hard disks, random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), optical storage devices, magnetic storage devices, flash memory, magnetic disks or optical disks and / or combinations of the above devices, that is, they can be implemented by any type of volatile or non-volatile storage device or a combination thereof.

[0059] like Figure 7 As shown, the present application also provides an embodiment of a processing device 1, including one or more processors 11 and a memory 10; wherein the memory 10 is used to store one or more computer programs, and the one or more processors 11 are used to execute one or more computer programs stored in the memory 10, so that the processor 11 executes the features / steps of the embodiment of the method for suppressing amplitude modulation and phase modulation distortion of the above-mentioned traveling wave tube.

[0060] The above is only the preferred embodiment of the present application. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present application.

Claims

1. A method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube, characterized in that: include: Obtaining the distribution of the relative phase angle of the interaction distribution section of the traveling wave tube, wherein the interaction distribution section includes the last section of the output section; According to the distribution, the maximum value of the relative phase angle of the last section of the output section is obtained; If the maximum value is within a preset range, the last section of the output section is optimized according to the pitch value corresponding to the maximum value, so as to suppress the amplitude modulation and phase modulation distortion of the traveling wave tube.

2. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 1, characterized in that: The method further comprises: Determining whether the maximum value is within the preset range; If the maximum value is greater than the maximum value of the preset range, the pitch value of the last section of the output section is adjusted to change the maximum value. When the maximum value falls within the preset range, the last section of the output section is optimized according to the current pitch value corresponding to the current maximum value within the preset range.

3. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 2, characterized in that: The adjusting the pitch value of the last section of the output section to change the maximum value includes: gradually increasing the pitch value according to a preset step length and recording the change of the maximum value.

4. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 2, characterized in that: The optimizing the last section of the output section according to the current pitch value corresponding to the current maximum value falling within the preset range comprises: The pitch value before adjustment is replaced by the current pitch value, so as to optimize the last section of the output section.

5. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 1, characterized in that: The step of obtaining the maximum value of the relative phase angle of the last segment of the output segment according to the distribution includes: According to the length value of the last segment of the output segment, the distribution position of the last segment of the output segment in the interaction distribution segment is obtained; According to the distribution position, the maximum value of the relative phase angle of the last section of the output section is obtained.

6. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 1, characterized in that: The method further comprises: performing simulation calculation on the traveling wave tube to obtain the distribution condition, the output power of the traveling wave tube and the amplitude modulation and phase modulation distortion condition.

7. The method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to claim 3, characterized in that: The preset step length ranges from 0.001 mm to 0.01 mm; the preset range is from 0 degrees to 10 degrees; and the traveling wave tube is a C-band traveling wave tube of 3.6 GHz to 4.4 GHz.

8. A computer program product, characterized in that The computer program product is stored on a data medium and is designed to execute the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed, the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube according to any one of claims 1 to 7 is implemented.

10. A processing device, characterized in that: include: one or more processors; A memory is used to store one or more computer programs, and one or more processors are used to execute the one or more computer programs stored in the memory, so that one or more processors execute the method for suppressing amplitude modulation and phase modulation distortion of a traveling wave tube as described in any one of claims 1 to 7.

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