CN111464243A - Down converter for communication simulator - Google Patents
Down converter for communication simulator Download PDFInfo
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- CN111464243A CN111464243A CN202010254757.9A CN202010254757A CN111464243A CN 111464243 A CN111464243 A CN 111464243A CN 202010254757 A CN202010254757 A CN 202010254757A CN 111464243 A CN111464243 A CN 111464243A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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Abstract
The invention discloses a down converter for a communication simulator, which aims at the problems that the prior down converter does not have the technology of automatically controlling and combining with an instruction to control the power of a radio frequency signal so as to prevent the saturation of the radio frequency receiving front end of the down converter caused by overlarge signal and can not set the noise coefficient of the down converter to control the receiving sensitivity of the communication simulator; the noise coefficient of the down converter can be changed by controlling the attenuation value of the numerical control attenuator, so that the sensitivity of the communication simulator is controlled, the communication simulator is suitable for different working modes and working environments, and the universality of the communication simulator is improved.
Description
Technical Field
The invention belongs to the technical field of measurement and control communication, and particularly relates to a down converter for a communication simulator.
Background
The spacecraft communication machines with opposite receiving and transmitting frequency points are arranged on different spacecrafts and used for completing full-duplex communication between the spacecrafts. The communication simulator can carry out full-duplex communication with the spacecraft communicator and is one of main devices for completing testing of the spacecraft communicator. The testing of the spacecraft communicator by the communication simulator is mainly divided into wired mode testing and wireless mode testing, wherein the wired mode testing refers to a mode that the communication simulator and the spacecraft communicator are interconnected by cables at an antenna port to realize communication; the wireless mode test refers to a mode that the communication simulator and the spacecraft communicator realize communication through wireless receiving and transmitting of the antenna. Both the wired mode test and the wireless mode test need to prevent the misoperating spacecraft communicator transmitting mode or the link from being unreasonably arranged, so that the signals received by the radio frequency receiving front end of the down converter for the communication simulator are overlarge, and further the down converter is saturated and even burnt, therefore, the down converter needs to have the anti-burning capability and can normally work under large signals.
When a spacecraft communication machine with opposite receiving/transmitting frequency points is tested in the same site, the communication simulators of the spacecraft communication machine need to be placed in a short distance due to the limitation of the size of the test site, and in order to prevent the situation that the receiving locking of the communication simulators with the opposite receiving/transmitting frequency points is caused by the radiation leakage of an up-converter of the communication simulators, the receiving sensitivity of the communication simulators needs to be reduced. However, when the communication simulator receives a small signal at radio frequency, the communication simulator needs to have higher sensitivity, so that the receiving sensitivity of the communication simulator needs to be flexibly set according to a test environment.
The down-converter is an important component of the communication simulator. Although the down converter which is publicly reported at present and can be used for a communication simulator can carry out numerical control setting on the local oscillation frequency, has an intermediate frequency AGC amplification function, can output monitoring voltage for a radio frequency input signal or an intermediate frequency output signal, but does not have an original signal output monitoring function for the radio frequency input and the intermediate frequency output; and the technology of automatically controlling and combining with an instruction to control the power of the radio-frequency signal is not provided to prevent the radio-frequency receiving front end of the down converter from being saturated due to overlarge signal, and the noise coefficient of the down converter cannot be set to control the receiving sensitivity of the communication simulator.
Disclosure of Invention
The invention aims to provide a down converter for a communication simulator, which can monitor a radio frequency input signal and an intermediate frequency output signal and can change the noise coefficient of the down converter by controlling the attenuation of a numerical control attenuator so as to control the receiving sensitivity of the communication simulator.
In order to solve the problems, the technical scheme of the invention is as follows:
a down converter for a communication simulator, comprising:
the radio frequency receiving module is used for receiving and processing a radio frequency input signal;
the local oscillator frequency mixing module is used for generating a local oscillator signal, mixing the local oscillator signal with the radio frequency input signal and outputting a frequency mixing signal;
the intermediate frequency amplification module is used for receiving the mixing signal and processing the mixing signal to obtain a required intermediate frequency signal;
the control module is electrically connected with the radio frequency receiving module, the local oscillator frequency mixing module and the intermediate frequency amplifying module and is used for controlling the power of the radio frequency input signal and setting the frequency of the local oscillator signal;
the radio frequency receiving module comprises a radio frequency directional coupler, two power dividers and a detector, wherein the radio frequency directional coupler is used for coupling one path of radio frequency input signals to the two power dividers; the two power dividers divide the radio frequency input signal into one path of radio frequency monitoring signal and output the radio frequency monitoring signal to the signal monitoring equipment, and one path of coupled radio frequency signal is output to the detector; the detector converts the coupled radio frequency signal into a voltage signal and outputs the voltage signal to the control module;
the intermediate frequency amplification module comprises an intermediate frequency directional coupler, and the intermediate frequency directional coupler is used for coupling one path of intermediate frequency signals as intermediate frequency monitoring signals and outputting the intermediate frequency monitoring signals to signal monitoring equipment.
According to an embodiment of the present invention, the rf receiving module further includes an amplitude limiter, where the amplitude limiter is disposed at a front end of the rf directional coupler and is configured to limit an amplitude of the rf input signal, so as to prevent the rf receiving module from being burnt down due to an excessively large amplitude of the rf input signal.
According to an embodiment of the present invention, the radio frequency receiving module further includes a numerical control attenuator, a first amplifier and a first filter;
the numerical control attenuator is electrically connected with the control module, receives the attenuation quantity set by the control module, attenuates the radio frequency signal and outputs the attenuated radio frequency signal to the first amplifier, and is used for adjusting the power of the signal entering the first amplifier;
the first amplifier amplifies radio frequency signals in low noise;
the first filter receives the radio frequency signal amplified by low noise and carries out image frequency filtering on the radio frequency signal.
According to an embodiment of the present invention, the gain of the first amplifier is 30dB, and the noise figure is less than 2 dB; the first filter is an image frequency suppression filter, and the image frequency suppression degree of the first filter is larger than 25 dB.
According to an embodiment of the present invention, the intermediate frequency amplifying module includes a second filter, a third filter, a fourth filter, a second amplifier, a third amplifier, a VGA amplifier, and an AGC amplifier;
the second filter receives the mixing signal output by the local oscillation mixing module, performs first filtering on the mixing signal, and outputs the filtered signal to the second amplifier;
the second amplifier is used for amplifying the signal output by the second filter for the first time and outputting the amplified signal to the VGA amplifier;
the VGA amplifier, the third filter, the third amplifier and the AGC amplifier form an automatic gain control loop to realize automatic gain control of signals; the control voltage of the VGA amplifier is the detection voltage of the AGC amplifier, and the AGC amplifier outputs a signal after gain control to the fourth filter;
the fourth filter performs low-pass filtering on the signal after gain control to obtain a required intermediate frequency signal;
and the intermediate frequency directional coupler couples an intermediate frequency signal output by the fourth filter as an intermediate frequency monitoring signal and outputs the intermediate frequency signal to signal monitoring equipment for monitoring.
According to one embodiment of the invention, the control module comprises an analog-to-digital converter and a single chip microcomputer;
the analog-to-digital converter converts the voltage signal output by the detector into a digital signal and converts the detection voltage output by the AGC amplifier into a digital signal;
the single chip microcomputer collects the voltage signal of the detector, the attenuation of the numerical control attenuator is set according to the voltage signal, and the attenuation of the numerical control attenuator is controlled to change the overall noise coefficient of the down converter.
According to an embodiment of the present invention, the control module further includes an interface circuit for implementing level conversion of communication signals between the single chip microcomputer and the upper computer;
the single chip microcomputer receives an attenuation setting instruction and a frequency setting instruction sent by an upper computer, and performs attenuation setting on the numerical control attenuator and setting on the output frequency of a frequency synthesizer in the local oscillation frequency mixing module; and feeding back the acquired voltage signal of the detector and the detection voltage of the AGC amplifier to an upper computer.
According to an embodiment of the present invention, the coupling degrees of the radio frequency directional coupler and the intermediate frequency directional coupler are both 10dB, and the directivities are both greater than 30 dB.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1) in an embodiment of the present invention, for a down converter for a communication simulator, a radio frequency directional coupler is disposed at a radio frequency input end of a radio frequency receiving module of the down converter, and couples a radio frequency input signal to two power dividers, and the two power dividers output a radio frequency signal as a radio frequency monitoring signal to a signal monitoring device, so as to monitor the original radio frequency input signal, so that the input and output signals of the down converter are transparent, and control and later-stage fault maintenance in a communication process are facilitated.
2) In the down converter for the communication simulator in the embodiment of the invention, aiming at the problem that the radio frequency receiving front end of the down converter for the communication simulator is saturated or burnt due to unreasonable link setting or misoperation of a spacecraft communication machine transmitting mode, the amplitude limiter is arranged at the front end of a radio frequency receiving module of the down converter to limit the amplitude of a radio frequency input signal, so that the radio frequency receiving front end is prevented from being burnt due to the input of an overlarge signal; the attenuation of the numerical control attenuator is controlled by collecting a voltage signal of the detector through the single chip microcomputer, so that the signal power entering the first amplifier is adjusted, and the phenomenon that the radio frequency receiving front end of the down converter is burnt or saturated due to overlarge signal power is avoided.
3) Aiming at the problem that the receiving sensitivity of the existing communication simulator can not be flexibly set to adapt to different working modes and working environments, the down converter for the communication simulator in the embodiment of the invention changes the noise system of the down converter through the numerical control attenuation technology of automatic control of the control module or instruction control of the upper computer, thereby changing the sensitivity of the communication simulator, enabling the communication simulator to adapt to different working modes and working environments and improving the universality of the communication simulator.
Drawings
FIG. 1 is a block diagram of a down converter for a communication simulator in an embodiment of the invention;
FIG. 2 is a functional block diagram of a down converter for a communication simulator in an embodiment of the present invention;
fig. 3 is a block diagram of a control module according to an embodiment of the invention.
Detailed Description
A downconverter for a communication simulator in accordance with the present invention is described in further detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.
In the field of communication measurement and control, in particular to aerospace communication measurement and control, spacecraft communication machines with opposite receiving and transmitting frequency points are arranged on different spacecrafts and are used for completing full-duplex communication between the spacecrafts. The communication simulator can carry out full-duplex communication with the spacecraft communicator and is one of main devices for completing testing of the spacecraft communicator.
The down-converter is an important component of the communication simulator. Although the down converter which is publicly reported at present and can be used for a communication simulator can carry out numerical control setting on the local oscillation frequency, has an intermediate frequency AGC amplification function, can output monitoring voltage for a radio frequency input signal or an intermediate frequency output signal, but does not have an original signal output monitoring function for the radio frequency input and the intermediate frequency output; and the technology of automatically controlling the radio frequency signal power in combination with an instruction is not provided to prevent the radio frequency receiving front end of the down converter from being saturated due to overlarge signal power, and the noise coefficient of the down converter cannot be set to control the receiving sensitivity of the communication simulator.
In view of the above problem, the present invention provides a down converter for a communication simulator, please refer to fig. 1, which includes a radio frequency receiving module 1 for performing power adjustment on a radio frequency input signal and outputting a monitoring signal of the radio frequency input signal; the local oscillator frequency mixing module 2 is used for generating local oscillator signals and mixing the local oscillator signals with radio frequency signals; the intermediate frequency amplification module 3 is used for carrying out variable gain amplification on the mixed signals to obtain required intermediate frequency signals and outputting monitoring signals of the intermediate frequency signals; the control module 4 is connected with the upper computer, the radio frequency receiving module 1, the local oscillator mixing module 2 and the intermediate frequency amplifying module 3, and is used for controlling the power of the radio frequency input signal and setting the frequency of the local oscillator signal, and simultaneously feeding back the attenuation value, the frequency of the local oscillator signal and the power of the radio frequency input signal to the upper computer.
The details of the down converter will be described below by taking the rf input signal as the S-band signal and the output if signal as 70MHz ± 4 MHz.
Specifically, the radio frequency receiving module 1 includes: the amplitude limiter 101 is used for limiting the signal at the input end of the down converter so as to prevent the radio frequency receiving front end from being burnt due to the fact that the signal is input with an overlarge amplitude; a radio frequency directional coupler 102 for coupling a radio frequency input signal to the two power dividers 103; the two-power divider 103 is used for dividing one path of signal into a radio frequency monitoring signal and outputting the radio frequency monitoring signal to a related monitoring instrument (such as a frequency spectrograph), wherein the amplitude of the radio frequency monitoring signal is smaller than that of an original radio frequency input signal, and the two-power divider 103 outputs the other path of radio frequency signal to the wave detector 104; the detector 104 is used for converting the coupled radio frequency signal into voltage and outputting the voltage to the control module 4; the digital control attenuator 105 is used for setting attenuation amount through the control module 5, and is used for adjusting signal power entering the first amplifier 106 in the down converter to prevent the radio frequency receiving front end of the down converter from being burnt or saturated due to overlarge radio frequency signal power; the first amplifier 106 is used for performing low-noise amplification on the received radio frequency signal and has the characteristic of low noise coefficient; a first filter 107 for image frequency filtering the radio frequency signal.
Please refer to fig. 2 for connection of each device in the rf receiving module 1, in the figure, the limiter 1 receives the rf input signal to limit the amplitude of the rf input signal, so as to prevent the rf receiving module 1 from being burnt due to the too large amplitude of the rf input signal, and the limiter 1 may adopt a limiter device with a model R L M-43-5W.
The radio frequency directional coupler 102 couples a part of the radio frequency signal output by the amplitude limiter 1 to the two power dividers 103; another part of the rf signal output by the limiter 1 enters the digitally controlled attenuator 105. The rf directional coupler 102 may be a coupler with a coupling degree of 10dB and a directivity of greater than 30 dB.
The two power dividers 103 divide the rf signal into one path of rf monitoring signal and output the rf monitoring signal to a signal monitoring device (spectrometer), and the other path of coupled rf signal is output to the detector 104. The two power dividers 103 are two power dividers, and the isolation degree is greater than 20 dB.
The detector 104 converts the coupled radio frequency signal into a voltage signal and outputs the voltage signal to the control module 4, and the detector 104 can be a detector device with the model number of AD L5513.
The control module 4 converts the received voltage signal into a digital signal and sends the digital signal to the digital control attenuator 105. The digital signal is the attenuation to be set by the numerical control attenuator 105, which is obtained by the control module 4 through processing according to the voltage signal of the detector 104. The digital control attenuator 105 receives the attenuation amount sent by the control module 4, attenuates the radio frequency signal, and outputs the attenuated radio frequency signal to the first amplifier 106, so as to adjust the power of the radio frequency signal entering the first amplifier 106, and prevent the radio frequency receiving module 1 from being burnt or saturated due to the overlarge power of the radio frequency signal. The digitally controlled attenuator 105 may be an attenuator model HMC273A with a maximum gain of 31 dB.
The first amplifier 106 performs low noise amplification on the radio frequency signal. The gain of the first amplifier 106 is 30dB, and the noise figure thereof is less than 2dB, which has the characteristic of low noise figure.
The first filter 107 receives the low-noise amplified radio frequency signal and performs image frequency filtering on the radio frequency signal. The first filter 107 is an image rejection filter for preventing interference of an image frequency of the rf signal with the downconverter during the wireless test. The image frequency rejection of the first filter 107 is greater than 25 dB.
The local oscillation frequency mixing module 2 in this embodiment includes: a crystal oscillator 201 for providing a reference frequency to the local oscillation circuit; the frequency synthesizer 202, which is set by the control module 4 to obtain a local oscillator signal with a required frequency; and the mixer 203 is used for mixing the radio frequency signal with the local oscillator signal.
The crystal oscillator can be a temperature compensation crystal oscillator with the frequency of 20 MHz. The mixer 203 and the frequency synthesizer 202 can be integrated, and a programmable frequency synthesizer integrated with the mixer can be selected, and the device model is RFFC 5072A.
The intermediate frequency amplification module 3 in this embodiment includes: a second filter 301, a third filter 304 and a fourth filter 307 for filtering out-of-band signals to obtain required intermediate frequency signals; a second amplifier 302 and a third amplifier 305 for amplifying the intermediate frequency signal; the VGA amplifier 303 and the AGC amplifier 306 are used for realizing automatic gain control of the intermediate frequency signal, wherein the control voltage of the VGA amplifier 303 is the detection voltage of the AGC amplifier 306; the intermediate frequency directional coupler 308 is configured to couple a path of intermediate frequency signal as an intermediate frequency monitoring signal, where the intermediate frequency monitoring signal is output to an associated monitoring instrument (e.g., a signal recorder or a spectrometer), and an amplitude of the intermediate frequency monitoring signal is smaller than an amplitude of the intermediate frequency signal output by the fourth filter.
The connections of the various components in the intermediate frequency amplifier 3 are shown in fig. 2. In the figure, second filter 301 is connected to the output of mixer 203, receives the mixed signal output from mixer 203, first filters the mixed signal, and outputs the filtered signal to second amplifier 302. The second filter 301 is an 8MHz sound meter filter centered at 70MHz with a 1dB bandwidth.
The second amplifier 302 first amplifies the signal output from the second filter 301, and outputs the amplified signal to the VGA amplifier 303. The second amplifier 302 may alternatively be an amplifying device of the type ERA-3 SM.
The VGA amplifier 303, the third filter 304, the third amplifier 305 and the AGC amplifier 306 form an automatic gain control loop to realize automatic gain control of the signal. The control voltage of the VGA amplifier 303 is the detection voltage of the AGC amplifier 306, the AGC amplifier 306 is electrically connected to the control module 4, and the control module 4 can collect the detection voltage of the AGC amplifier 306, convert the detection voltage into a digital signal, and report the digital signal to the upper computer. The AGC amplifier 306 outputs the gain-controlled signal to the fourth filter 307. VGA amplifier 303 and AGC amplifier 306 can select the device with signal AD 8368; the third filter 304 can select an 8MHz sound meter filter with a center frequency of 70MHz and a 1dB bandwidth; the third amplifier 305 may be selected from an amplifying device of type ERA-3 SM.
The fourth filter 307 low-pass filters the gain controlled signal to obtain the desired if signal, the fourth filter 307 may be a 5 th order L C low-pass filter.
The intermediate frequency directional coupler 308 couples an intermediate frequency signal output by the fourth filter 307 as an intermediate frequency monitoring signal, and outputs the intermediate frequency signal to a signal monitoring device for monitoring. The coupling of the if directional coupler 308 is 10dB and the directivity is greater than 30 dB.
Referring to fig. 3, a control module 4 in this embodiment includes: the analog-to-digital converter 401 is configured to convert the voltage signal output by the detector 104 in the rf receiving module 1 into a digital signal, and convert the detection voltage of the AGC amplifier 306 into a digital signal. And the interface circuit 403 is used for realizing the conversion of the communication signal level between the single chip microcomputer 402 and the upper computer. The single chip microcomputer 402 is used for setting the attenuation value of the numerical control attenuator 105, wherein the initial value is the maximum attenuation value of the numerical control attenuator 31 dB; the initial operating frequency of frequency synthesizer 202 is set. The single chip microcomputer 402 can receive an attenuation value setting instruction and a frequency setting instruction sent by the upper computer and set the attenuation value sent by the numerical control attenuator 105 according to the attenuation value setting instruction; the output frequency of the frequency synthesizer 202 is set according to the frequency setting instruction. Besides receiving the instruction of the upper computer to set the relevant parameters, the single chip microcomputer 402 can also set the attenuation value of the numerical control attenuator 105 according to the collected detection voltage value of the radio frequency receiving module 1. And the acquired detection voltage value of the radio frequency receiving module 1 and the AGC detection voltage value of the intermediate frequency amplification module 2 can be fed back to the upper computer, and the noise coefficient of the down converter can be changed according to the attenuation value of the control numerical control attenuator 105.
Specifically, the analog-to-digital converter 401 and the single chip microcomputer 402 can be integrated into a whole by using a chip with the model of C8051F340, and the interface circuit can adopt an RS232 interface circuit to complete communication between the upper computer and the single chip microcomputer 202.
In summary, the down converter for a communication simulator provided by the present invention can output a coupling signal of a radio frequency input signal and an intermediate frequency signal as a monitoring signal; by adopting a numerical control attenuation technology of automatic control and instruction control of radio frequency signal power, the problem that the radio frequency receiving front end of a down converter of a communication simulator is saturated or burnt due to unreasonable link setting or misoperation of a spacecraft communication machine transmitting mode can be avoided; and the noise coefficient of the down converter can be changed by controlling the attenuation value of the numerical control attenuator 105, so that the sensitivity of the communication simulator is controlled, the communication simulator is adaptive to different working modes and working environments, and the universality of the communication simulator is improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. A down converter for a communication simulator, comprising:
the radio frequency receiving module is used for receiving and processing a radio frequency input signal;
the local oscillator frequency mixing module is used for generating a local oscillator signal, mixing the local oscillator signal with the radio frequency input signal and outputting a frequency mixing signal;
the intermediate frequency amplification module is used for receiving the mixing signal and processing the mixing signal to obtain a required intermediate frequency signal;
the control module is electrically connected with the radio frequency receiving module, the local oscillator frequency mixing module and the intermediate frequency amplifying module and is used for controlling the power of the radio frequency input signal and setting the frequency of the local oscillator signal;
the radio frequency receiving module comprises a radio frequency directional coupler, two power dividers and a detector, wherein the radio frequency directional coupler is used for coupling one path of radio frequency input signals to the two power dividers; the two power dividers divide the radio frequency input signal into one path of radio frequency monitoring signal and output the radio frequency monitoring signal to the signal monitoring equipment, and the other path of coupled radio frequency signal is output to the detector; the detector converts the coupled radio frequency signal into a voltage signal and outputs the voltage signal to the control module;
the intermediate frequency amplification module comprises an intermediate frequency directional coupler, and the intermediate frequency directional coupler is used for coupling one path of intermediate frequency signals as intermediate frequency monitoring signals and outputting the intermediate frequency monitoring signals to signal monitoring equipment.
2. The downconverter for a communication simulator of claim 1, wherein the rf receive module further comprises a limiter disposed at a front end of the rf directional coupler for limiting an amplitude of the rf input signal to prevent burning of the rf receive module due to an excessive amplitude of the rf input signal.
3. The downconverter for a communication simulator of claim 2, wherein the radio frequency receive module further comprises a digitally controlled attenuator, a first amplifier and a first filter;
the numerical control attenuator is electrically connected with the control module, receives the attenuation quantity set by the control module, attenuates the radio frequency signal and outputs the attenuated radio frequency signal to the first amplifier, and is used for adjusting the power of the signal entering the first amplifier;
the first amplifier amplifies radio frequency signals in low noise;
the first filter receives the radio frequency signal amplified by low noise and carries out image frequency filtering on the radio frequency signal.
4. A down converter for a communication simulator as defined in claim 3, wherein the intermediate frequency amplification module includes a second filter, a third filter, a fourth filter, a second amplifier, a third amplifier, a VGA amplifier, an AGC amplifier;
the second filter receives the mixing signal output by the local oscillation mixing module, performs first filtering on the mixing signal, and outputs the filtered signal to the second amplifier;
the second amplifier is used for amplifying the signal output by the second filter for the first time and outputting the amplified signal to the VGA amplifier;
the VGA amplifier, the third filter, the third amplifier and the AGC amplifier form an automatic gain control loop to realize automatic gain control of signals; the control voltage of the VGA amplifier is the detection voltage of the AGC amplifier, and the AGC amplifier outputs a signal after gain control to the fourth filter;
the fourth filter performs low-pass filtering on the signal after gain control to obtain a required intermediate frequency signal;
and the intermediate frequency directional coupler couples an intermediate frequency signal output by the fourth filter as an intermediate frequency monitoring signal and outputs the intermediate frequency signal to signal monitoring equipment for monitoring.
5. The down converter for a communication simulator of claim 4, wherein the control module comprises an analog-to-digital converter, a single-chip microcomputer;
the analog-to-digital converter converts the voltage signal output by the detector into a digital signal and converts the detection voltage output by the AGC amplifier into a digital signal;
the single chip microcomputer collects the voltage signal of the detector, the attenuation of the numerical control attenuator is set according to the voltage signal, and the attenuation of the numerical control attenuator is controlled to change the overall noise coefficient of the down converter.
6. The down converter for a communication simulator of claim 5, wherein the control module further comprises an interface circuit for converting a level of a communication signal between the single chip microcomputer and an upper computer;
the single chip microcomputer receives an attenuation setting instruction and a frequency setting instruction sent by an upper computer, and performs attenuation setting on the numerical control attenuator and setting on the output frequency of a frequency synthesizer in the local oscillation frequency mixing module; and feeding back the acquired voltage signal of the detector and the detection voltage of the AGC amplifier to an upper computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803898A (en) * | 2021-03-17 | 2021-05-14 | 成都瑞迪威科技有限公司 | High-integration-level frequency conversion channel assembly |
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