CN216959886U - Interference source generating device and microwave interference source - Google Patents
Interference source generating device and microwave interference source Download PDFInfo
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- CN216959886U CN216959886U CN202220437259.2U CN202220437259U CN216959886U CN 216959886 U CN216959886 U CN 216959886U CN 202220437259 U CN202220437259 U CN 202220437259U CN 216959886 U CN216959886 U CN 216959886U
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Abstract
The utility model relates to an interference source generating device and a microwave interference source, and belongs to the field of microwave interference. The interference source generating device realizes tracking of the frequency of the output signal of the crystal oscillator by using the frequency of the reference signal output by the first phase-locked loop, outputs the baseband interference signal for frequency mixing by using the baseband interference signal generating circuit based on the reference signal, can improve the frequency of the baseband interference signal and reduce the generation of stray signals, is beneficial to the separation of the stray signals, further improves the working frequency of the interference signal output after frequency mixing, and effectively reduces the stray signals output after frequency mixing.
Description
Technical Field
The utility model relates to the field of microwave interference, in particular to an interference source generating device and a microwave interference source.
Background
In modern microwave communication systems, in order to ensure the normal operation of microwave communication, equipment debugging is usually performed in an interference environment. In the existing interference source design technology, a frequency synthesizer is usually used to directly generate a baseband interference signal based on the signal frequency output by a crystal oscillator, and the baseband interference signal is mixed with a frequency-adjustable signal source to obtain a high-frequency interference signal.
However, the frequency of the baseband interference signal generated by using the crystal oscillator and the frequency synthesizer is low, and the baseband interference signal is not easy to separate from the spurious signal, so that the working frequency of the interference signal obtained after mixing is low, and the number of the spurious signals is large.
SUMMERY OF THE UTILITY MODEL
The interference source generating device aims to solve the technical problems that the frequency of a baseband interference signal generated by the existing interference source generating device is low, the baseband interference signal is not easy to separate from a stray signal, the working frequency of the interference signal obtained after mixing is low, and the stray signal is more. The utility model provides an interference source generating device and a microwave interference source.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the present invention provides an interference source generating apparatus, including a crystal oscillator, a first phase-locked loop, a baseband interference signal generating circuit, a signal generating circuit, and a mixer circuit, wherein:
the crystal oscillator is connected with the baseband interference signal generating circuit through a first phase-locked loop and is also connected with the signal generating circuit;
the baseband interference signal generating circuit and the signal generating circuit are respectively connected with the mixing circuit, and the signal output by the signal generating circuit and the signal output by the baseband interference signal generating circuit are signals with different frequencies.
The beneficial effects of the utility model are: the interference source generating device utilizes the frequency of the reference signal output by the first phase-locked loop to track the frequency of the output signal of the crystal oscillator, and utilizes the baseband interference signal generating circuit to output the baseband interference signal for frequency mixing based on the reference signal, so that the frequency of the baseband interference signal can be improved, the generation of stray signals can be reduced, the separation of the stray signals is facilitated, the working frequency of the interference signal output after frequency mixing is further improved, and the stray signals output after frequency mixing are effectively reduced.
On the basis of the technical scheme, the utility model can be further improved as follows.
Further, the baseband interference signal generating circuit includes a frequency synthesizer, a first frequency multiplying circuit and a filter circuit, wherein:
the first phase-locked loop is connected with a first frequency multiplier circuit through a frequency synthesizer, and the first frequency multiplier circuit is connected with the mixer circuit through a filter circuit.
The beneficial effect who adopts above-mentioned improvement scheme is: the baseband interference signal generated by the frequency synthesizer is subjected to frequency multiplication and then filtering, so that the baseband interference signal which is free of noise and has high frequency can be obtained.
Further, the frequency synthesizer is a direct digital frequency synthesizer.
The beneficial effect who adopts above-mentioned improvement scheme is: the direct digital frequency synthesizer has higher frequency resolution, can realize rapid frequency switching, and is convenient for modulating the frequency, the phase and the amplitude of baseband interference signals.
Further, the signal generating circuit includes a second phase locked loop and a first amplifying circuit, wherein:
the crystal oscillator is connected with the first amplifying circuit through the second phase-locked loop, and the first amplifying circuit is connected with the frequency mixing circuit.
The beneficial effect who adopts above-mentioned improvement scheme is: a second phase locked loop and a first amplifying circuit are provided to output an intrinsic signal for frequency mixing.
Further, the mixing circuit comprises a mixer, a second frequency doubling circuit and a second amplifying circuit, wherein:
the baseband interference signal generating circuit and the signal generating circuit are respectively connected with the frequency mixer, and the frequency mixer is connected with the second amplifying circuit through the second frequency doubling circuit.
The beneficial effect who adopts above-mentioned improvement scheme is: and a second frequency doubling circuit and a second amplifying circuit are arranged to improve the power and the frequency of the interference signal output after frequency mixing.
Further, an attenuator is also included, wherein:
the attenuator is respectively connected with the baseband interference signal generating circuit and the signal generating circuit through the mixing circuit.
The beneficial effect who adopts above-mentioned improvement scheme is: the attenuator is arranged to increase the dynamic range of the power of the interfering signal and thus the interference range of the interferer generating device.
Further, the attenuator is a numerical control attenuator.
The beneficial effect who adopts above-mentioned improvement scheme is: the numerical control attenuator is controlled by external level, so that the attenuation of the signal can be conveniently changed, and the power of the output interference signal can be quickly adjusted.
In a second aspect, the present invention provides a microwave interference source comprising an interference source generating device as described in the first aspect.
The system further comprises a single chip microcomputer and a display control module connected with the single chip microcomputer, wherein the single chip microcomputer is connected with the interference source generating device, and the display control module comprises a display screen and control keys.
Furthermore, the single chip microcomputer is provided with a program downloading port and a remote upper computer control port.
Additional aspects of the utility model and its advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an interference source generating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a chassis of a microwave interference source according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a front panel of a chassis of a microwave interference source according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a rear panel of a chassis of a microwave interference source according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an inside of a chassis of a microwave interference source according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a case shell, 2, a front panel, 3, a rear panel, 4, a display screen, 5, a power switch button, 6, a control key, 7, a radio frequency output port, 8, a remote upper computer control port, 9, a program downloading port, 11, a grounding column, 12, a power supply conversion module, 13, a numerical control attenuation module, 14, a radio frequency output connecting cable, 15, a radio frequency signal control processing module, 16, a three-phase power supply interface, 10, a crystal oscillator, 20, a first phase-locked loop, 30, a baseband interference signal generating circuit, 40, a signal generating circuit, 50, a frequency mixing circuit, 60, an attenuator, 301, a frequency synthesizer, 302, a first frequency doubling circuit, 303, a filtering circuit, 401, a second phase-locked loop, 402, a first amplifying circuit, 501, a frequency mixer, 502, a second frequency doubling circuit, 503 and a second amplifying circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 provides an interference source generating apparatus for the present embodiment, which includes a crystal oscillator 10, a first phase-locked loop 20, a baseband interference signal generating circuit 30, a signal generating circuit 40, and a mixer circuit 50, where:
the crystal oscillator 10 is connected with the baseband interference signal generating circuit 30 through the first phase-locked loop 20, and the crystal oscillator 10 is further connected with the signal generating circuit 40;
the baseband interference signal generating circuit 30 and the signal generating circuit 40 are connected to the mixer circuit 50, respectively, and the signal output from the signal generating circuit 40 and the signal output from the baseband interference signal generating circuit 30 are signals of different frequencies.
In this embodiment, the crystal oscillator 10 is used to output a set signal frequency to the first phase locked loop 20 and the signal generating circuit 40, for example, to set the signal frequency output by the crystal oscillator to 26 MHz. The frequency of the signal output by the crystal oscillator 10 is tracked by setting the first phase-locked loop 20, i.e. the output signal of the first phase-locked loop 20 is phase-synchronized with the output signal of the crystal oscillator 10, so that the first phase-locked loop 20 becomes a high and stable frequency source, the baseband interference signal generating circuit 30 takes the signal with the stable frequency output from the first phase-locked loop 20 as a reference signal, namely, the reference signal outputted from the first phase locked loop 20 is inputted to the baseband interference signal generating circuit 30, the baseband interference signal with high frequency and less spurious signals is output through the baseband interference signal generating circuit 30, while the signal generating circuit 40 outputs the eigen signal based on the reference signal, the eigen signal and the baseband interference signal have different frequencies, so that the mixer circuit 50 can mix the input eigen signal and the baseband interference signal, thereby obtaining an interference signal with a high frequency and less spurious.
As a possible implementation, the first phase-locked loop 20 employs an HMC830 phase-locked loop.
Optionally, in an embodiment, the baseband interference signal generating circuit 30 includes a frequency synthesizer 301, a first frequency multiplier circuit 302, and a filter circuit 303, where:
the first phase locked loop 20 is connected to a first frequency multiplier 302 through a frequency synthesizer 301, and the first frequency multiplier 302 is connected to the mixer circuit 50 through a filter circuit 303.
In this embodiment, the frequency synthesizer 301 generates a baseband interference signal according to an input reference signal, the first frequency doubling circuit 302 doubles the frequency of the baseband interference signal, and the filter circuit 303 filters the frequency-doubled baseband interference signal to filter out low-frequency spurious signals (noise) generated by frequency doubling, so as to obtain a noise-free baseband interference signal.
As a possible implementation, the filter circuit 303 is a filter circuit composed of an LC filter and a dielectric filter.
As a possible implementation manner, the first frequency doubling circuit 302 is a frequency doubling circuit formed by a frequency doubling chip in a gallium arsenide bare chip package form, so as to increase the frequency of the baseband interference signal.
Optionally, frequency synthesizer 301 is a direct digital frequency synthesizer.
It will be appreciated that direct digital frequency synthesisers have a high frequency resolution, allow fast frequency switching and maintain phase continuity when changed.
In this embodiment, the direct digital frequency synthesizer can automatically modulate the frequency, phase and amplitude of the baseband interference signal according to the input control signal, so that the corresponding frequency synthesizer does not need to be manually replaced when the signal is modulated, and the frequency and bandwidth of the baseband interference signal can be conveniently changed. The control signal input to the direct digital frequency synthesizer may be obtained by manually adjusting an output level of a dc power supply connected to the direct digital frequency synthesizer.
The direct digital frequency synthesizer may adopt an AD9910 digital frequency synthesizer.
As another possible implementation, the direct digital frequency synthesizer is connected to a single chip, and the single chip outputs a control signal to control the modulation function of the direct digital frequency synthesizer.
Optionally, in an embodiment, the signal generating circuit 40 includes a second phase locked loop 401 and a first amplifying circuit 402, wherein:
the crystal oscillator 10 is connected to a first amplifier circuit 402 via a second phase-locked loop 401, and the first amplifier circuit 402 is connected to the mixer circuit 50.
It can be understood that the phase-locked loop can compare the frequency and the phase of the internal oscillation signal of the frequency control loop according to the external input signal, so as to realize the automatic tracking of the frequency of the output signal to the frequency of the input signal, and can change the frequency of the output signal rapidly by controlling the phase-locked loop to perform the hopping of the local oscillation frequency, thereby better realizing the modulation function of the signal.
In this embodiment, the second phase locked loop 401 tracks the frequency of the output signal of the crystal oscillator 10 and outputs the intrinsic signal, i.e. the intrinsic signal output by the second phase locked loop 401 is phase-synchronized with the output signal of the crystal oscillator 10. The intrinsic signal is amplified in power by the first amplifier circuit 402 and then output to the mixer circuit 50 to be mixed.
The first amplifying circuit 402 may be an amplifying circuit formed by an amplifier chip in a gallium arsenide bare chip package.
As a possible implementation manner, the output levels of the dc power supplies respectively connected to the first phase-locked loop 20 and the second phase-locked loop 401 are manually adjusted to control the first phase-locked loop 20 and the second phase-locked loop 401 to perform local frequency hopping, so as to change the frequencies of the reference signal output by the first phase-locked loop 20 and the intrinsic signal output by the second phase-locked loop 401.
As another possible implementation, the single chip controls the first phase-locked loop 20 and the second phase-locked loop 401 to perform local oscillation frequency hopping, so as to change the frequencies of the reference signal output by the first phase-locked loop 20 and the intrinsic signal output by the second phase-locked loop 401.
Optionally, in an embodiment, the mixing circuit 50 includes a mixer 501, a second frequency multiplying circuit 502, and a second amplifying circuit 503, where:
the baseband interference signal generating circuit 30 and the signal generating circuit 40 are connected to a mixer 501, and the mixer 501 is connected to a second amplifying circuit 503 through a second frequency multiplying circuit 502.
Illustratively, the crystal oscillator 10 provides reference frequencies for the first phase-locked loop 20 and the second phase-locked loop 401, the first phase-locked loop 20 outputs a reference signal to a Direct Digital Synthesizer (DDS), a baseband interference signal generated by the DDS is sequentially input into the first frequency multiplier circuit 302 and the filter circuit 303, then mixed with a signal output by the second phase-locked loop 401, an interference signal in a C frequency band is output, frequency multiplication is performed by the second frequency multiplier circuit 502 for 8 times, an interference signal in a Ka frequency band is output, and power amplification is performed by the second amplification circuit 503, so that an interference signal in high frequency and high power can be obtained.
The mixer 501 may be MCA-50MH + mixer, the second frequency doubling circuit 502 may be a frequency doubling circuit formed by a frequency doubling chip in the form of a gallium arsenide bare chip, and the second amplifying circuit 503 may be an amplifying circuit formed by an amplifier chip in the form of a gallium arsenide bare chip.
Optionally, in an embodiment, an attenuator 60 is further included, wherein:
the attenuator 60 is connected to the baseband interference signal generation circuit 30 and the signal generation circuit 40 via the mixer circuit 50, respectively.
In this embodiment, by selecting different attenuators 60, the power level of the interference signal output by the mixer circuit 50 can be adjusted, and the dynamic range of the power of the interference signal output by the interference source generator is expanded, thereby expanding the interference range on the signal.
Optionally, the attenuator 60 is a digitally controlled attenuator.
It can be understood that the digital control attenuator can change the attenuation of the digital control attenuator to the signal based on the external level, thereby conveniently adjusting the power of the interference signal, and the changed external level can be generated by manually adjusting the turn-off/turn-on of the direct current power supply or by a single chip connected with the digital control attenuator.
Wherein, the numerical control attenuator can be NC13106C-3040 PD.
The utility model also provides a microwave interference source which comprises the interference source generating device in the embodiment.
Optionally, the system further comprises a single chip microcomputer and a display control module connected with the single chip microcomputer, the single chip microcomputer is connected with the interference source generating device, and the display control module comprises a display screen and control keys.
In the embodiment, the single chip microcomputer is connected with a device capable of realizing numerical control in the interference source generating device, and the level output by the single chip microcomputer is changed through the display control module so as to control devices such as a DDS (direct digital synthesizer), a phase-locked loop and a numerical control attenuator to modulate signals.
Optionally, the single chip microcomputer is provided with a program downloading port and a remote upper computer control port.
In this embodiment, the singlechip can select the STM32F103RCT6 singlechip for use, and through the control port of long-range host computer, the singlechip can receive the order of long-range host computer to realize the remote control to the device that the singlechip is connected, the program download port can conveniently carry out software upgrading and debugging maintenance to the singlechip.
Illustratively, the enclosure of the microwave interference source shown in fig. 2 is composed of an enclosure housing 1, a front panel 2 and a rear panel 3.
As shown in fig. 3, the front panel 2 is provided with a display control module connected to the single chip, the display control module includes a display screen 4 and a control key 6, the front panel 2 is further provided with a power switch button 5 for controlling the power supply of the microwave interference source to be turned on or off, and a radio frequency output port 7 for outputting an interference signal from the microwave interference source.
As shown in fig. 4, the rear panel 3 is provided with a remote upper computer control port 8 and a program downloading port 9 connected to the single chip microcomputer, and the rear panel 3 is further provided with a grounding post 11 and a three-phase power interface 16 for externally connecting a three-phase power.
As shown in fig. 5, a power conversion module 12, a numerical control attenuation module 13, a radio frequency output connection cable 14, and a radio frequency signal control processing module 15 are disposed inside the chassis of the microwave interference source. The power conversion module 12 is configured to convert an external three-phase power into a power that can supply power to each device of the microwave interference source; the radio frequency output connecting cable 14 is connected with the numerical control attenuation module 13 and the radio frequency output port 7 and is used for transmitting interference signals; the numerical control attenuation module 13 comprises a numerical control attenuator in the interference source generating device; the rf signal control processing module 15 includes a single chip, and a crystal oscillator 10, a first phase-locked loop 20, a baseband interference signal generating circuit 30, a signal generating circuit 40, and a mixing circuit 50 in the interference source generating device.
The interference source generating device and the microwave interference source with the structure realize tracking of the frequency of the output signal of the crystal oscillator by using the frequency of the reference signal output by the first phase-locked loop, and output the baseband interference signal for frequency mixing by using the baseband interference signal generating circuit based on the reference signal, can improve the frequency of the baseband interference signal and reduce the generation of stray signals, are favorable for the separation of the stray signals, further improve the working frequency of the interference signal output after frequency mixing, and effectively reduce the stray signals output after frequency mixing.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An interference source generating device, comprising a crystal oscillator, a first phase locked loop, a baseband interference signal generating circuit, a signal generating circuit, and a mixer circuit, wherein:
the crystal oscillator is connected with the baseband interference signal generating circuit through the first phase-locked loop, and is also connected with the signal generating circuit;
the baseband interference signal generating circuit and the signal generating circuit are respectively connected with the mixing circuit, and the signal output by the signal generating circuit and the signal output by the baseband interference signal generating circuit are signals with different frequencies.
2. The interference source generating device according to claim 1, wherein the baseband interference signal generating circuit comprises a frequency synthesizer, a first frequency multiplying circuit and a filter circuit, wherein:
the first phase-locked loop is connected with the first frequency doubling circuit through the frequency synthesizer, and the first frequency doubling circuit is connected with the frequency mixing circuit through the filter circuit.
3. The interferer generation device of claim 2, wherein the frequency synthesizer is a direct digital frequency synthesizer.
4. The interference source generating apparatus according to claim 1, wherein the signal generating circuit comprises a second phase-locked loop and a first amplifying circuit, wherein:
the crystal oscillator is connected with the first amplifying circuit through the second phase-locked loop, and the first amplifying circuit is connected with the frequency mixing circuit.
5. The interference source generating apparatus according to claim 1, wherein the mixing circuit comprises a mixer, a second frequency multiplying circuit, and a second amplifying circuit, wherein:
the baseband interference signal generating circuit and the signal generating circuit are respectively connected with the frequency mixer, and the frequency mixer is connected with the second amplifying circuit through the second frequency doubling circuit.
6. The interference source generating apparatus according to any one of claims 1 to 5, further comprising an attenuator, wherein:
the attenuator is respectively connected with the baseband interference signal generating circuit and the signal generating circuit through the mixing circuit.
7. The interferer generation device of claim 6, wherein the attenuator is a digitally controlled attenuator.
8. A microwave interference source, comprising the interference source generating apparatus according to any one of claims 1 to 7.
9. The microwave interference source of claim 8, further comprising a single chip microcomputer and a display control module connected with the single chip microcomputer, wherein the single chip microcomputer is connected with the interference source generating device, and the display control module comprises a display screen and a control key.
10. A microwave interference source as claimed in claim 9, wherein the single chip microcomputer is provided with a program download port and a remote upper computer control port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220437259.2U CN216959886U (en) | 2022-03-02 | 2022-03-02 | Interference source generating device and microwave interference source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220437259.2U CN216959886U (en) | 2022-03-02 | 2022-03-02 | Interference source generating device and microwave interference source |
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| Publication Number | Publication Date |
|---|---|
| CN216959886U true CN216959886U (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220437259.2U Active CN216959886U (en) | 2022-03-02 | 2022-03-02 | Interference source generating device and microwave interference source |
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| Country | Link |
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| CN (1) | CN216959886U (en) |
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- 2022-03-02 CN CN202220437259.2U patent/CN216959886U/en active Active
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